README 201 KB

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  1. #
  2. # (C) Copyright 2000 - 2013
  3. # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  4. #
  5. # SPDX-License-Identifier: GPL-2.0+
  6. #
  7. Summary:
  8. ========
  9. This directory contains the source code for U-Boot, a boot loader for
  10. Embedded boards based on PowerPC, ARM, MIPS and several other
  11. processors, which can be installed in a boot ROM and used to
  12. initialize and test the hardware or to download and run application
  13. code.
  14. The development of U-Boot is closely related to Linux: some parts of
  15. the source code originate in the Linux source tree, we have some
  16. header files in common, and special provision has been made to
  17. support booting of Linux images.
  18. Some attention has been paid to make this software easily
  19. configurable and extendable. For instance, all monitor commands are
  20. implemented with the same call interface, so that it's very easy to
  21. add new commands. Also, instead of permanently adding rarely used
  22. code (for instance hardware test utilities) to the monitor, you can
  23. load and run it dynamically.
  24. Status:
  25. =======
  26. In general, all boards for which a configuration option exists in the
  27. Makefile have been tested to some extent and can be considered
  28. "working". In fact, many of them are used in production systems.
  29. In case of problems see the CHANGELOG and CREDITS files to find out
  30. who contributed the specific port. The boards.cfg file lists board
  31. maintainers.
  32. Note: There is no CHANGELOG file in the actual U-Boot source tree;
  33. it can be created dynamically from the Git log using:
  34. make CHANGELOG
  35. Where to get help:
  36. ==================
  37. In case you have questions about, problems with or contributions for
  38. U-Boot you should send a message to the U-Boot mailing list at
  39. <u-boot@lists.denx.de>. There is also an archive of previous traffic
  40. on the mailing list - please search the archive before asking FAQ's.
  41. Please see http://lists.denx.de/pipermail/u-boot and
  42. http://dir.gmane.org/gmane.comp.boot-loaders.u-boot
  43. Where to get source code:
  44. =========================
  45. The U-Boot source code is maintained in the git repository at
  46. git://www.denx.de/git/u-boot.git ; you can browse it online at
  47. http://www.denx.de/cgi-bin/gitweb.cgi?p=u-boot.git;a=summary
  48. The "snapshot" links on this page allow you to download tarballs of
  49. any version you might be interested in. Official releases are also
  50. available for FTP download from the ftp://ftp.denx.de/pub/u-boot/
  51. directory.
  52. Pre-built (and tested) images are available from
  53. ftp://ftp.denx.de/pub/u-boot/images/
  54. Where we come from:
  55. ===================
  56. - start from 8xxrom sources
  57. - create PPCBoot project (http://sourceforge.net/projects/ppcboot)
  58. - clean up code
  59. - make it easier to add custom boards
  60. - make it possible to add other [PowerPC] CPUs
  61. - extend functions, especially:
  62. * Provide extended interface to Linux boot loader
  63. * S-Record download
  64. * network boot
  65. * PCMCIA / CompactFlash / ATA disk / SCSI ... boot
  66. - create ARMBoot project (http://sourceforge.net/projects/armboot)
  67. - add other CPU families (starting with ARM)
  68. - create U-Boot project (http://sourceforge.net/projects/u-boot)
  69. - current project page: see http://www.denx.de/wiki/U-Boot
  70. Names and Spelling:
  71. ===================
  72. The "official" name of this project is "Das U-Boot". The spelling
  73. "U-Boot" shall be used in all written text (documentation, comments
  74. in source files etc.). Example:
  75. This is the README file for the U-Boot project.
  76. File names etc. shall be based on the string "u-boot". Examples:
  77. include/asm-ppc/u-boot.h
  78. #include <asm/u-boot.h>
  79. Variable names, preprocessor constants etc. shall be either based on
  80. the string "u_boot" or on "U_BOOT". Example:
  81. U_BOOT_VERSION u_boot_logo
  82. IH_OS_U_BOOT u_boot_hush_start
  83. Versioning:
  84. ===========
  85. Starting with the release in October 2008, the names of the releases
  86. were changed from numerical release numbers without deeper meaning
  87. into a time stamp based numbering. Regular releases are identified by
  88. names consisting of the calendar year and month of the release date.
  89. Additional fields (if present) indicate release candidates or bug fix
  90. releases in "stable" maintenance trees.
  91. Examples:
  92. U-Boot v2009.11 - Release November 2009
  93. U-Boot v2009.11.1 - Release 1 in version November 2009 stable tree
  94. U-Boot v2010.09-rc1 - Release candiate 1 for September 2010 release
  95. Directory Hierarchy:
  96. ====================
  97. /arch Architecture specific files
  98. /arm Files generic to ARM architecture
  99. /cpu CPU specific files
  100. /arm720t Files specific to ARM 720 CPUs
  101. /arm920t Files specific to ARM 920 CPUs
  102. /at91 Files specific to Atmel AT91RM9200 CPU
  103. /imx Files specific to Freescale MC9328 i.MX CPUs
  104. /s3c24x0 Files specific to Samsung S3C24X0 CPUs
  105. /arm925t Files specific to ARM 925 CPUs
  106. /arm926ejs Files specific to ARM 926 CPUs
  107. /arm1136 Files specific to ARM 1136 CPUs
  108. /ixp Files specific to Intel XScale IXP CPUs
  109. /pxa Files specific to Intel XScale PXA CPUs
  110. /s3c44b0 Files specific to Samsung S3C44B0 CPUs
  111. /sa1100 Files specific to Intel StrongARM SA1100 CPUs
  112. /lib Architecture specific library files
  113. /avr32 Files generic to AVR32 architecture
  114. /cpu CPU specific files
  115. /lib Architecture specific library files
  116. /blackfin Files generic to Analog Devices Blackfin architecture
  117. /cpu CPU specific files
  118. /lib Architecture specific library files
  119. /m68k Files generic to m68k architecture
  120. /cpu CPU specific files
  121. /mcf52x2 Files specific to Freescale ColdFire MCF52x2 CPUs
  122. /mcf5227x Files specific to Freescale ColdFire MCF5227x CPUs
  123. /mcf532x Files specific to Freescale ColdFire MCF5329 CPUs
  124. /mcf5445x Files specific to Freescale ColdFire MCF5445x CPUs
  125. /mcf547x_8x Files specific to Freescale ColdFire MCF547x_8x CPUs
  126. /lib Architecture specific library files
  127. /microblaze Files generic to microblaze architecture
  128. /cpu CPU specific files
  129. /lib Architecture specific library files
  130. /mips Files generic to MIPS architecture
  131. /cpu CPU specific files
  132. /mips32 Files specific to MIPS32 CPUs
  133. /xburst Files specific to Ingenic XBurst CPUs
  134. /lib Architecture specific library files
  135. /nds32 Files generic to NDS32 architecture
  136. /cpu CPU specific files
  137. /n1213 Files specific to Andes Technology N1213 CPUs
  138. /lib Architecture specific library files
  139. /nios2 Files generic to Altera NIOS2 architecture
  140. /cpu CPU specific files
  141. /lib Architecture specific library files
  142. /openrisc Files generic to OpenRISC architecture
  143. /cpu CPU specific files
  144. /lib Architecture specific library files
  145. /powerpc Files generic to PowerPC architecture
  146. /cpu CPU specific files
  147. /74xx_7xx Files specific to Freescale MPC74xx and 7xx CPUs
  148. /mpc5xx Files specific to Freescale MPC5xx CPUs
  149. /mpc5xxx Files specific to Freescale MPC5xxx CPUs
  150. /mpc8xx Files specific to Freescale MPC8xx CPUs
  151. /mpc824x Files specific to Freescale MPC824x CPUs
  152. /mpc8260 Files specific to Freescale MPC8260 CPUs
  153. /mpc85xx Files specific to Freescale MPC85xx CPUs
  154. /ppc4xx Files specific to AMCC PowerPC 4xx CPUs
  155. /lib Architecture specific library files
  156. /sh Files generic to SH architecture
  157. /cpu CPU specific files
  158. /sh2 Files specific to sh2 CPUs
  159. /sh3 Files specific to sh3 CPUs
  160. /sh4 Files specific to sh4 CPUs
  161. /lib Architecture specific library files
  162. /sparc Files generic to SPARC architecture
  163. /cpu CPU specific files
  164. /leon2 Files specific to Gaisler LEON2 SPARC CPU
  165. /leon3 Files specific to Gaisler LEON3 SPARC CPU
  166. /lib Architecture specific library files
  167. /x86 Files generic to x86 architecture
  168. /cpu CPU specific files
  169. /lib Architecture specific library files
  170. /api Machine/arch independent API for external apps
  171. /board Board dependent files
  172. /common Misc architecture independent functions
  173. /disk Code for disk drive partition handling
  174. /doc Documentation (don't expect too much)
  175. /drivers Commonly used device drivers
  176. /dts Contains Makefile for building internal U-Boot fdt.
  177. /examples Example code for standalone applications, etc.
  178. /fs Filesystem code (cramfs, ext2, jffs2, etc.)
  179. /include Header Files
  180. /lib Files generic to all architectures
  181. /libfdt Library files to support flattened device trees
  182. /lzma Library files to support LZMA decompression
  183. /lzo Library files to support LZO decompression
  184. /net Networking code
  185. /post Power On Self Test
  186. /spl Secondary Program Loader framework
  187. /tools Tools to build S-Record or U-Boot images, etc.
  188. Software Configuration:
  189. =======================
  190. Configuration is usually done using C preprocessor defines; the
  191. rationale behind that is to avoid dead code whenever possible.
  192. There are two classes of configuration variables:
  193. * Configuration _OPTIONS_:
  194. These are selectable by the user and have names beginning with
  195. "CONFIG_".
  196. * Configuration _SETTINGS_:
  197. These depend on the hardware etc. and should not be meddled with if
  198. you don't know what you're doing; they have names beginning with
  199. "CONFIG_SYS_".
  200. Later we will add a configuration tool - probably similar to or even
  201. identical to what's used for the Linux kernel. Right now, we have to
  202. do the configuration by hand, which means creating some symbolic
  203. links and editing some configuration files. We use the TQM8xxL boards
  204. as an example here.
  205. Selection of Processor Architecture and Board Type:
  206. ---------------------------------------------------
  207. For all supported boards there are ready-to-use default
  208. configurations available; just type "make <board_name>_config".
  209. Example: For a TQM823L module type:
  210. cd u-boot
  211. make TQM823L_config
  212. For the Cogent platform, you need to specify the CPU type as well;
  213. e.g. "make cogent_mpc8xx_config". And also configure the cogent
  214. directory according to the instructions in cogent/README.
  215. Configuration Options:
  216. ----------------------
  217. Configuration depends on the combination of board and CPU type; all
  218. such information is kept in a configuration file
  219. "include/configs/<board_name>.h".
  220. Example: For a TQM823L module, all configuration settings are in
  221. "include/configs/TQM823L.h".
  222. Many of the options are named exactly as the corresponding Linux
  223. kernel configuration options. The intention is to make it easier to
  224. build a config tool - later.
  225. The following options need to be configured:
  226. - CPU Type: Define exactly one, e.g. CONFIG_MPC85XX.
  227. - Board Type: Define exactly one, e.g. CONFIG_MPC8540ADS.
  228. - CPU Daughterboard Type: (if CONFIG_ATSTK1000 is defined)
  229. Define exactly one, e.g. CONFIG_ATSTK1002
  230. - CPU Module Type: (if CONFIG_COGENT is defined)
  231. Define exactly one of
  232. CONFIG_CMA286_60_OLD
  233. --- FIXME --- not tested yet:
  234. CONFIG_CMA286_60, CONFIG_CMA286_21, CONFIG_CMA286_60P,
  235. CONFIG_CMA287_23, CONFIG_CMA287_50
  236. - Motherboard Type: (if CONFIG_COGENT is defined)
  237. Define exactly one of
  238. CONFIG_CMA101, CONFIG_CMA102
  239. - Motherboard I/O Modules: (if CONFIG_COGENT is defined)
  240. Define one or more of
  241. CONFIG_CMA302
  242. - Motherboard Options: (if CONFIG_CMA101 or CONFIG_CMA102 are defined)
  243. Define one or more of
  244. CONFIG_LCD_HEARTBEAT - update a character position on
  245. the LCD display every second with
  246. a "rotator" |\-/|\-/
  247. - Board flavour: (if CONFIG_MPC8260ADS is defined)
  248. CONFIG_ADSTYPE
  249. Possible values are:
  250. CONFIG_SYS_8260ADS - original MPC8260ADS
  251. CONFIG_SYS_8266ADS - MPC8266ADS
  252. CONFIG_SYS_PQ2FADS - PQ2FADS-ZU or PQ2FADS-VR
  253. CONFIG_SYS_8272ADS - MPC8272ADS
  254. - Marvell Family Member
  255. CONFIG_SYS_MVFS - define it if you want to enable
  256. multiple fs option at one time
  257. for marvell soc family
  258. - MPC824X Family Member (if CONFIG_MPC824X is defined)
  259. Define exactly one of
  260. CONFIG_MPC8240, CONFIG_MPC8245
  261. - 8xx CPU Options: (if using an MPC8xx CPU)
  262. CONFIG_8xx_GCLK_FREQ - deprecated: CPU clock if
  263. get_gclk_freq() cannot work
  264. e.g. if there is no 32KHz
  265. reference PIT/RTC clock
  266. CONFIG_8xx_OSCLK - PLL input clock (either EXTCLK
  267. or XTAL/EXTAL)
  268. - 859/866/885 CPU options: (if using a MPC859 or MPC866 or MPC885 CPU):
  269. CONFIG_SYS_8xx_CPUCLK_MIN
  270. CONFIG_SYS_8xx_CPUCLK_MAX
  271. CONFIG_8xx_CPUCLK_DEFAULT
  272. See doc/README.MPC866
  273. CONFIG_SYS_MEASURE_CPUCLK
  274. Define this to measure the actual CPU clock instead
  275. of relying on the correctness of the configured
  276. values. Mostly useful for board bringup to make sure
  277. the PLL is locked at the intended frequency. Note
  278. that this requires a (stable) reference clock (32 kHz
  279. RTC clock or CONFIG_SYS_8XX_XIN)
  280. CONFIG_SYS_DELAYED_ICACHE
  281. Define this option if you want to enable the
  282. ICache only when Code runs from RAM.
  283. - 85xx CPU Options:
  284. CONFIG_SYS_PPC64
  285. Specifies that the core is a 64-bit PowerPC implementation (implements
  286. the "64" category of the Power ISA). This is necessary for ePAPR
  287. compliance, among other possible reasons.
  288. CONFIG_SYS_FSL_TBCLK_DIV
  289. Defines the core time base clock divider ratio compared to the
  290. system clock. On most PQ3 devices this is 8, on newer QorIQ
  291. devices it can be 16 or 32. The ratio varies from SoC to Soc.
  292. CONFIG_SYS_FSL_PCIE_COMPAT
  293. Defines the string to utilize when trying to match PCIe device
  294. tree nodes for the given platform.
  295. CONFIG_SYS_PPC_E500_DEBUG_TLB
  296. Enables a temporary TLB entry to be used during boot to work
  297. around limitations in e500v1 and e500v2 external debugger
  298. support. This reduces the portions of the boot code where
  299. breakpoints and single stepping do not work. The value of this
  300. symbol should be set to the TLB1 entry to be used for this
  301. purpose.
  302. CONFIG_SYS_FSL_ERRATUM_A004510
  303. Enables a workaround for erratum A004510. If set,
  304. then CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV and
  305. CONFIG_SYS_FSL_CORENET_SNOOPVEC_COREONLY must be set.
  306. CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV
  307. CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV2 (optional)
  308. Defines one or two SoC revisions (low 8 bits of SVR)
  309. for which the A004510 workaround should be applied.
  310. The rest of SVR is either not relevant to the decision
  311. of whether the erratum is present (e.g. p2040 versus
  312. p2041) or is implied by the build target, which controls
  313. whether CONFIG_SYS_FSL_ERRATUM_A004510 is set.
  314. See Freescale App Note 4493 for more information about
  315. this erratum.
  316. CONFIG_A003399_NOR_WORKAROUND
  317. Enables a workaround for IFC erratum A003399. It is only
  318. requred during NOR boot.
  319. CONFIG_SYS_FSL_CORENET_SNOOPVEC_COREONLY
  320. This is the value to write into CCSR offset 0x18600
  321. according to the A004510 workaround.
  322. CONFIG_SYS_FSL_DSP_DDR_ADDR
  323. This value denotes start offset of DDR memory which is
  324. connected exclusively to the DSP cores.
  325. CONFIG_SYS_FSL_DSP_M2_RAM_ADDR
  326. This value denotes start offset of M2 memory
  327. which is directly connected to the DSP core.
  328. CONFIG_SYS_FSL_DSP_M3_RAM_ADDR
  329. This value denotes start offset of M3 memory which is directly
  330. connected to the DSP core.
  331. CONFIG_SYS_FSL_DSP_CCSRBAR_DEFAULT
  332. This value denotes start offset of DSP CCSR space.
  333. CONFIG_SYS_FSL_DDR_EMU
  334. Specify emulator support for DDR. Some DDR features such as
  335. deskew training are not available.
  336. - Generic CPU options:
  337. CONFIG_SYS_BIG_ENDIAN, CONFIG_SYS_LITTLE_ENDIAN
  338. Defines the endianess of the CPU. Implementation of those
  339. values is arch specific.
  340. - Intel Monahans options:
  341. CONFIG_SYS_MONAHANS_RUN_MODE_OSC_RATIO
  342. Defines the Monahans run mode to oscillator
  343. ratio. Valid values are 8, 16, 24, 31. The core
  344. frequency is this value multiplied by 13 MHz.
  345. CONFIG_SYS_MONAHANS_TURBO_RUN_MODE_RATIO
  346. Defines the Monahans turbo mode to oscillator
  347. ratio. Valid values are 1 (default if undefined) and
  348. 2. The core frequency as calculated above is multiplied
  349. by this value.
  350. - MIPS CPU options:
  351. CONFIG_SYS_INIT_SP_OFFSET
  352. Offset relative to CONFIG_SYS_SDRAM_BASE for initial stack
  353. pointer. This is needed for the temporary stack before
  354. relocation.
  355. CONFIG_SYS_MIPS_CACHE_MODE
  356. Cache operation mode for the MIPS CPU.
  357. See also arch/mips/include/asm/mipsregs.h.
  358. Possible values are:
  359. CONF_CM_CACHABLE_NO_WA
  360. CONF_CM_CACHABLE_WA
  361. CONF_CM_UNCACHED
  362. CONF_CM_CACHABLE_NONCOHERENT
  363. CONF_CM_CACHABLE_CE
  364. CONF_CM_CACHABLE_COW
  365. CONF_CM_CACHABLE_CUW
  366. CONF_CM_CACHABLE_ACCELERATED
  367. CONFIG_SYS_XWAY_EBU_BOOTCFG
  368. Special option for Lantiq XWAY SoCs for booting from NOR flash.
  369. See also arch/mips/cpu/mips32/start.S.
  370. CONFIG_XWAY_SWAP_BYTES
  371. Enable compilation of tools/xway-swap-bytes needed for Lantiq
  372. XWAY SoCs for booting from NOR flash. The U-Boot image needs to
  373. be swapped if a flash programmer is used.
  374. - ARM options:
  375. CONFIG_SYS_EXCEPTION_VECTORS_HIGH
  376. Select high exception vectors of the ARM core, e.g., do not
  377. clear the V bit of the c1 register of CP15.
  378. CONFIG_SYS_THUMB_BUILD
  379. Use this flag to build U-Boot using the Thumb instruction
  380. set for ARM architectures. Thumb instruction set provides
  381. better code density. For ARM architectures that support
  382. Thumb2 this flag will result in Thumb2 code generated by
  383. GCC.
  384. CONFIG_ARM_ERRATA_716044
  385. CONFIG_ARM_ERRATA_742230
  386. CONFIG_ARM_ERRATA_743622
  387. CONFIG_ARM_ERRATA_751472
  388. If set, the workarounds for these ARM errata are applied early
  389. during U-Boot startup. Note that these options force the
  390. workarounds to be applied; no CPU-type/version detection
  391. exists, unlike the similar options in the Linux kernel. Do not
  392. set these options unless they apply!
  393. - CPU timer options:
  394. CONFIG_SYS_HZ
  395. The frequency of the timer returned by get_timer().
  396. get_timer() must operate in milliseconds and this CONFIG
  397. option must be set to 1000.
  398. - Linux Kernel Interface:
  399. CONFIG_CLOCKS_IN_MHZ
  400. U-Boot stores all clock information in Hz
  401. internally. For binary compatibility with older Linux
  402. kernels (which expect the clocks passed in the
  403. bd_info data to be in MHz) the environment variable
  404. "clocks_in_mhz" can be defined so that U-Boot
  405. converts clock data to MHZ before passing it to the
  406. Linux kernel.
  407. When CONFIG_CLOCKS_IN_MHZ is defined, a definition of
  408. "clocks_in_mhz=1" is automatically included in the
  409. default environment.
  410. CONFIG_MEMSIZE_IN_BYTES [relevant for MIPS only]
  411. When transferring memsize parameter to linux, some versions
  412. expect it to be in bytes, others in MB.
  413. Define CONFIG_MEMSIZE_IN_BYTES to make it in bytes.
  414. CONFIG_OF_LIBFDT
  415. New kernel versions are expecting firmware settings to be
  416. passed using flattened device trees (based on open firmware
  417. concepts).
  418. CONFIG_OF_LIBFDT
  419. * New libfdt-based support
  420. * Adds the "fdt" command
  421. * The bootm command automatically updates the fdt
  422. OF_CPU - The proper name of the cpus node (only required for
  423. MPC512X and MPC5xxx based boards).
  424. OF_SOC - The proper name of the soc node (only required for
  425. MPC512X and MPC5xxx based boards).
  426. OF_TBCLK - The timebase frequency.
  427. OF_STDOUT_PATH - The path to the console device
  428. boards with QUICC Engines require OF_QE to set UCC MAC
  429. addresses
  430. CONFIG_OF_BOARD_SETUP
  431. Board code has addition modification that it wants to make
  432. to the flat device tree before handing it off to the kernel
  433. CONFIG_OF_BOOT_CPU
  434. This define fills in the correct boot CPU in the boot
  435. param header, the default value is zero if undefined.
  436. CONFIG_OF_IDE_FIXUP
  437. U-Boot can detect if an IDE device is present or not.
  438. If not, and this new config option is activated, U-Boot
  439. removes the ATA node from the DTS before booting Linux,
  440. so the Linux IDE driver does not probe the device and
  441. crash. This is needed for buggy hardware (uc101) where
  442. no pull down resistor is connected to the signal IDE5V_DD7.
  443. CONFIG_MACH_TYPE [relevant for ARM only][mandatory]
  444. This setting is mandatory for all boards that have only one
  445. machine type and must be used to specify the machine type
  446. number as it appears in the ARM machine registry
  447. (see http://www.arm.linux.org.uk/developer/machines/).
  448. Only boards that have multiple machine types supported
  449. in a single configuration file and the machine type is
  450. runtime discoverable, do not have to use this setting.
  451. - vxWorks boot parameters:
  452. bootvx constructs a valid bootline using the following
  453. environments variables: bootfile, ipaddr, serverip, hostname.
  454. It loads the vxWorks image pointed bootfile.
  455. CONFIG_SYS_VXWORKS_BOOT_DEVICE - The vxworks device name
  456. CONFIG_SYS_VXWORKS_MAC_PTR - Ethernet 6 byte MA -address
  457. CONFIG_SYS_VXWORKS_SERVERNAME - Name of the server
  458. CONFIG_SYS_VXWORKS_BOOT_ADDR - Address of boot parameters
  459. CONFIG_SYS_VXWORKS_ADD_PARAMS
  460. Add it at the end of the bootline. E.g "u=username pw=secret"
  461. Note: If a "bootargs" environment is defined, it will overwride
  462. the defaults discussed just above.
  463. - Cache Configuration:
  464. CONFIG_SYS_ICACHE_OFF - Do not enable instruction cache in U-Boot
  465. CONFIG_SYS_DCACHE_OFF - Do not enable data cache in U-Boot
  466. CONFIG_SYS_L2CACHE_OFF- Do not enable L2 cache in U-Boot
  467. - Cache Configuration for ARM:
  468. CONFIG_SYS_L2_PL310 - Enable support for ARM PL310 L2 cache
  469. controller
  470. CONFIG_SYS_PL310_BASE - Physical base address of PL310
  471. controller register space
  472. - Serial Ports:
  473. CONFIG_PL010_SERIAL
  474. Define this if you want support for Amba PrimeCell PL010 UARTs.
  475. CONFIG_PL011_SERIAL
  476. Define this if you want support for Amba PrimeCell PL011 UARTs.
  477. CONFIG_PL011_CLOCK
  478. If you have Amba PrimeCell PL011 UARTs, set this variable to
  479. the clock speed of the UARTs.
  480. CONFIG_PL01x_PORTS
  481. If you have Amba PrimeCell PL010 or PL011 UARTs on your board,
  482. define this to a list of base addresses for each (supported)
  483. port. See e.g. include/configs/versatile.h
  484. CONFIG_PL011_SERIAL_RLCR
  485. Some vendor versions of PL011 serial ports (e.g. ST-Ericsson U8500)
  486. have separate receive and transmit line control registers. Set
  487. this variable to initialize the extra register.
  488. CONFIG_PL011_SERIAL_FLUSH_ON_INIT
  489. On some platforms (e.g. U8500) U-Boot is loaded by a second stage
  490. boot loader that has already initialized the UART. Define this
  491. variable to flush the UART at init time.
  492. - Console Interface:
  493. Depending on board, define exactly one serial port
  494. (like CONFIG_8xx_CONS_SMC1, CONFIG_8xx_CONS_SMC2,
  495. CONFIG_8xx_CONS_SCC1, ...), or switch off the serial
  496. console by defining CONFIG_8xx_CONS_NONE
  497. Note: if CONFIG_8xx_CONS_NONE is defined, the serial
  498. port routines must be defined elsewhere
  499. (i.e. serial_init(), serial_getc(), ...)
  500. CONFIG_CFB_CONSOLE
  501. Enables console device for a color framebuffer. Needs following
  502. defines (cf. smiLynxEM, i8042)
  503. VIDEO_FB_LITTLE_ENDIAN graphic memory organisation
  504. (default big endian)
  505. VIDEO_HW_RECTFILL graphic chip supports
  506. rectangle fill
  507. (cf. smiLynxEM)
  508. VIDEO_HW_BITBLT graphic chip supports
  509. bit-blit (cf. smiLynxEM)
  510. VIDEO_VISIBLE_COLS visible pixel columns
  511. (cols=pitch)
  512. VIDEO_VISIBLE_ROWS visible pixel rows
  513. VIDEO_PIXEL_SIZE bytes per pixel
  514. VIDEO_DATA_FORMAT graphic data format
  515. (0-5, cf. cfb_console.c)
  516. VIDEO_FB_ADRS framebuffer address
  517. VIDEO_KBD_INIT_FCT keyboard int fct
  518. (i.e. i8042_kbd_init())
  519. VIDEO_TSTC_FCT test char fct
  520. (i.e. i8042_tstc)
  521. VIDEO_GETC_FCT get char fct
  522. (i.e. i8042_getc)
  523. CONFIG_CONSOLE_CURSOR cursor drawing on/off
  524. (requires blink timer
  525. cf. i8042.c)
  526. CONFIG_SYS_CONSOLE_BLINK_COUNT blink interval (cf. i8042.c)
  527. CONFIG_CONSOLE_TIME display time/date info in
  528. upper right corner
  529. (requires CONFIG_CMD_DATE)
  530. CONFIG_VIDEO_LOGO display Linux logo in
  531. upper left corner
  532. CONFIG_VIDEO_BMP_LOGO use bmp_logo.h instead of
  533. linux_logo.h for logo.
  534. Requires CONFIG_VIDEO_LOGO
  535. CONFIG_CONSOLE_EXTRA_INFO
  536. additional board info beside
  537. the logo
  538. When CONFIG_CFB_CONSOLE_ANSI is defined, console will support
  539. a limited number of ANSI escape sequences (cursor control,
  540. erase functions and limited graphics rendition control).
  541. When CONFIG_CFB_CONSOLE is defined, video console is
  542. default i/o. Serial console can be forced with
  543. environment 'console=serial'.
  544. When CONFIG_SILENT_CONSOLE is defined, all console
  545. messages (by U-Boot and Linux!) can be silenced with
  546. the "silent" environment variable. See
  547. doc/README.silent for more information.
  548. - Console Baudrate:
  549. CONFIG_BAUDRATE - in bps
  550. Select one of the baudrates listed in
  551. CONFIG_SYS_BAUDRATE_TABLE, see below.
  552. CONFIG_SYS_BRGCLK_PRESCALE, baudrate prescale
  553. - Console Rx buffer length
  554. With CONFIG_SYS_SMC_RXBUFLEN it is possible to define
  555. the maximum receive buffer length for the SMC.
  556. This option is actual only for 82xx and 8xx possible.
  557. If using CONFIG_SYS_SMC_RXBUFLEN also CONFIG_SYS_MAXIDLE
  558. must be defined, to setup the maximum idle timeout for
  559. the SMC.
  560. - Pre-Console Buffer:
  561. Prior to the console being initialised (i.e. serial UART
  562. initialised etc) all console output is silently discarded.
  563. Defining CONFIG_PRE_CONSOLE_BUFFER will cause U-Boot to
  564. buffer any console messages prior to the console being
  565. initialised to a buffer of size CONFIG_PRE_CON_BUF_SZ
  566. bytes located at CONFIG_PRE_CON_BUF_ADDR. The buffer is
  567. a circular buffer, so if more than CONFIG_PRE_CON_BUF_SZ
  568. bytes are output before the console is initialised, the
  569. earlier bytes are discarded.
  570. 'Sane' compilers will generate smaller code if
  571. CONFIG_PRE_CON_BUF_SZ is a power of 2
  572. - Safe printf() functions
  573. Define CONFIG_SYS_VSNPRINTF to compile in safe versions of
  574. the printf() functions. These are defined in
  575. include/vsprintf.h and include snprintf(), vsnprintf() and
  576. so on. Code size increase is approximately 300-500 bytes.
  577. If this option is not given then these functions will
  578. silently discard their buffer size argument - this means
  579. you are not getting any overflow checking in this case.
  580. - Boot Delay: CONFIG_BOOTDELAY - in seconds
  581. Delay before automatically booting the default image;
  582. set to -1 to disable autoboot.
  583. set to -2 to autoboot with no delay and not check for abort
  584. (even when CONFIG_ZERO_BOOTDELAY_CHECK is defined).
  585. See doc/README.autoboot for these options that
  586. work with CONFIG_BOOTDELAY. None are required.
  587. CONFIG_BOOT_RETRY_TIME
  588. CONFIG_BOOT_RETRY_MIN
  589. CONFIG_AUTOBOOT_KEYED
  590. CONFIG_AUTOBOOT_PROMPT
  591. CONFIG_AUTOBOOT_DELAY_STR
  592. CONFIG_AUTOBOOT_STOP_STR
  593. CONFIG_AUTOBOOT_DELAY_STR2
  594. CONFIG_AUTOBOOT_STOP_STR2
  595. CONFIG_ZERO_BOOTDELAY_CHECK
  596. CONFIG_RESET_TO_RETRY
  597. - Autoboot Command:
  598. CONFIG_BOOTCOMMAND
  599. Only needed when CONFIG_BOOTDELAY is enabled;
  600. define a command string that is automatically executed
  601. when no character is read on the console interface
  602. within "Boot Delay" after reset.
  603. CONFIG_BOOTARGS
  604. This can be used to pass arguments to the bootm
  605. command. The value of CONFIG_BOOTARGS goes into the
  606. environment value "bootargs".
  607. CONFIG_RAMBOOT and CONFIG_NFSBOOT
  608. The value of these goes into the environment as
  609. "ramboot" and "nfsboot" respectively, and can be used
  610. as a convenience, when switching between booting from
  611. RAM and NFS.
  612. - Pre-Boot Commands:
  613. CONFIG_PREBOOT
  614. When this option is #defined, the existence of the
  615. environment variable "preboot" will be checked
  616. immediately before starting the CONFIG_BOOTDELAY
  617. countdown and/or running the auto-boot command resp.
  618. entering interactive mode.
  619. This feature is especially useful when "preboot" is
  620. automatically generated or modified. For an example
  621. see the LWMON board specific code: here "preboot" is
  622. modified when the user holds down a certain
  623. combination of keys on the (special) keyboard when
  624. booting the systems
  625. - Serial Download Echo Mode:
  626. CONFIG_LOADS_ECHO
  627. If defined to 1, all characters received during a
  628. serial download (using the "loads" command) are
  629. echoed back. This might be needed by some terminal
  630. emulations (like "cu"), but may as well just take
  631. time on others. This setting #define's the initial
  632. value of the "loads_echo" environment variable.
  633. - Kgdb Serial Baudrate: (if CONFIG_CMD_KGDB is defined)
  634. CONFIG_KGDB_BAUDRATE
  635. Select one of the baudrates listed in
  636. CONFIG_SYS_BAUDRATE_TABLE, see below.
  637. - Monitor Functions:
  638. Monitor commands can be included or excluded
  639. from the build by using the #include files
  640. <config_cmd_all.h> and #undef'ing unwanted
  641. commands, or using <config_cmd_default.h>
  642. and augmenting with additional #define's
  643. for wanted commands.
  644. The default command configuration includes all commands
  645. except those marked below with a "*".
  646. CONFIG_CMD_ASKENV * ask for env variable
  647. CONFIG_CMD_BDI bdinfo
  648. CONFIG_CMD_BEDBUG * Include BedBug Debugger
  649. CONFIG_CMD_BMP * BMP support
  650. CONFIG_CMD_BSP * Board specific commands
  651. CONFIG_CMD_BOOTD bootd
  652. CONFIG_CMD_CACHE * icache, dcache
  653. CONFIG_CMD_CONSOLE coninfo
  654. CONFIG_CMD_CRC32 * crc32
  655. CONFIG_CMD_DATE * support for RTC, date/time...
  656. CONFIG_CMD_DHCP * DHCP support
  657. CONFIG_CMD_DIAG * Diagnostics
  658. CONFIG_CMD_DS4510 * ds4510 I2C gpio commands
  659. CONFIG_CMD_DS4510_INFO * ds4510 I2C info command
  660. CONFIG_CMD_DS4510_MEM * ds4510 I2C eeprom/sram commansd
  661. CONFIG_CMD_DS4510_RST * ds4510 I2C rst command
  662. CONFIG_CMD_DTT * Digital Therm and Thermostat
  663. CONFIG_CMD_ECHO echo arguments
  664. CONFIG_CMD_EDITENV edit env variable
  665. CONFIG_CMD_EEPROM * EEPROM read/write support
  666. CONFIG_CMD_ELF * bootelf, bootvx
  667. CONFIG_CMD_ENV_CALLBACK * display details about env callbacks
  668. CONFIG_CMD_ENV_FLAGS * display details about env flags
  669. CONFIG_CMD_EXPORTENV * export the environment
  670. CONFIG_CMD_EXT2 * ext2 command support
  671. CONFIG_CMD_EXT4 * ext4 command support
  672. CONFIG_CMD_SAVEENV saveenv
  673. CONFIG_CMD_FDC * Floppy Disk Support
  674. CONFIG_CMD_FAT * FAT command support
  675. CONFIG_CMD_FDOS * Dos diskette Support
  676. CONFIG_CMD_FLASH flinfo, erase, protect
  677. CONFIG_CMD_FPGA FPGA device initialization support
  678. CONFIG_CMD_FUSE * Device fuse support
  679. CONFIG_CMD_GETTIME * Get time since boot
  680. CONFIG_CMD_GO * the 'go' command (exec code)
  681. CONFIG_CMD_GREPENV * search environment
  682. CONFIG_CMD_HASH * calculate hash / digest
  683. CONFIG_CMD_HWFLOW * RTS/CTS hw flow control
  684. CONFIG_CMD_I2C * I2C serial bus support
  685. CONFIG_CMD_IDE * IDE harddisk support
  686. CONFIG_CMD_IMI iminfo
  687. CONFIG_CMD_IMLS List all images found in NOR flash
  688. CONFIG_CMD_IMLS_NAND * List all images found in NAND flash
  689. CONFIG_CMD_IMMAP * IMMR dump support
  690. CONFIG_CMD_IMPORTENV * import an environment
  691. CONFIG_CMD_INI * import data from an ini file into the env
  692. CONFIG_CMD_IRQ * irqinfo
  693. CONFIG_CMD_ITEST Integer/string test of 2 values
  694. CONFIG_CMD_JFFS2 * JFFS2 Support
  695. CONFIG_CMD_KGDB * kgdb
  696. CONFIG_CMD_LDRINFO * ldrinfo (display Blackfin loader)
  697. CONFIG_CMD_LINK_LOCAL * link-local IP address auto-configuration
  698. (169.254.*.*)
  699. CONFIG_CMD_LOADB loadb
  700. CONFIG_CMD_LOADS loads
  701. CONFIG_CMD_MD5SUM * print md5 message digest
  702. (requires CONFIG_CMD_MEMORY and CONFIG_MD5)
  703. CONFIG_CMD_MEMINFO * Display detailed memory information
  704. CONFIG_CMD_MEMORY md, mm, nm, mw, cp, cmp, crc, base,
  705. loop, loopw
  706. CONFIG_CMD_MEMTEST * mtest
  707. CONFIG_CMD_MISC Misc functions like sleep etc
  708. CONFIG_CMD_MMC * MMC memory mapped support
  709. CONFIG_CMD_MII * MII utility commands
  710. CONFIG_CMD_MTDPARTS * MTD partition support
  711. CONFIG_CMD_NAND * NAND support
  712. CONFIG_CMD_NET bootp, tftpboot, rarpboot
  713. CONFIG_CMD_NFS NFS support
  714. CONFIG_CMD_PCA953X * PCA953x I2C gpio commands
  715. CONFIG_CMD_PCA953X_INFO * PCA953x I2C gpio info command
  716. CONFIG_CMD_PCI * pciinfo
  717. CONFIG_CMD_PCMCIA * PCMCIA support
  718. CONFIG_CMD_PING * send ICMP ECHO_REQUEST to network
  719. host
  720. CONFIG_CMD_PORTIO * Port I/O
  721. CONFIG_CMD_READ * Read raw data from partition
  722. CONFIG_CMD_REGINFO * Register dump
  723. CONFIG_CMD_RUN run command in env variable
  724. CONFIG_CMD_SANDBOX * sb command to access sandbox features
  725. CONFIG_CMD_SAVES * save S record dump
  726. CONFIG_CMD_SCSI * SCSI Support
  727. CONFIG_CMD_SDRAM * print SDRAM configuration information
  728. (requires CONFIG_CMD_I2C)
  729. CONFIG_CMD_SETGETDCR Support for DCR Register access
  730. (4xx only)
  731. CONFIG_CMD_SF * Read/write/erase SPI NOR flash
  732. CONFIG_CMD_SHA1SUM * print sha1 memory digest
  733. (requires CONFIG_CMD_MEMORY)
  734. CONFIG_CMD_SOFTSWITCH * Soft switch setting command for BF60x
  735. CONFIG_CMD_SOURCE "source" command Support
  736. CONFIG_CMD_SPI * SPI serial bus support
  737. CONFIG_CMD_TFTPSRV * TFTP transfer in server mode
  738. CONFIG_CMD_TFTPPUT * TFTP put command (upload)
  739. CONFIG_CMD_TIME * run command and report execution time (ARM specific)
  740. CONFIG_CMD_TIMER * access to the system tick timer
  741. CONFIG_CMD_USB * USB support
  742. CONFIG_CMD_CDP * Cisco Discover Protocol support
  743. CONFIG_CMD_MFSL * Microblaze FSL support
  744. CONFIG_CMD_XIMG Load part of Multi Image
  745. EXAMPLE: If you want all functions except of network
  746. support you can write:
  747. #include "config_cmd_all.h"
  748. #undef CONFIG_CMD_NET
  749. Other Commands:
  750. fdt (flattened device tree) command: CONFIG_OF_LIBFDT
  751. Note: Don't enable the "icache" and "dcache" commands
  752. (configuration option CONFIG_CMD_CACHE) unless you know
  753. what you (and your U-Boot users) are doing. Data
  754. cache cannot be enabled on systems like the 8xx or
  755. 8260 (where accesses to the IMMR region must be
  756. uncached), and it cannot be disabled on all other
  757. systems where we (mis-) use the data cache to hold an
  758. initial stack and some data.
  759. XXX - this list needs to get updated!
  760. - Regular expression support:
  761. CONFIG_REGEX
  762. If this variable is defined, U-Boot is linked against
  763. the SLRE (Super Light Regular Expression) library,
  764. which adds regex support to some commands, as for
  765. example "env grep" and "setexpr".
  766. - Device tree:
  767. CONFIG_OF_CONTROL
  768. If this variable is defined, U-Boot will use a device tree
  769. to configure its devices, instead of relying on statically
  770. compiled #defines in the board file. This option is
  771. experimental and only available on a few boards. The device
  772. tree is available in the global data as gd->fdt_blob.
  773. U-Boot needs to get its device tree from somewhere. This can
  774. be done using one of the two options below:
  775. CONFIG_OF_EMBED
  776. If this variable is defined, U-Boot will embed a device tree
  777. binary in its image. This device tree file should be in the
  778. board directory and called <soc>-<board>.dts. The binary file
  779. is then picked up in board_init_f() and made available through
  780. the global data structure as gd->blob.
  781. CONFIG_OF_SEPARATE
  782. If this variable is defined, U-Boot will build a device tree
  783. binary. It will be called u-boot.dtb. Architecture-specific
  784. code will locate it at run-time. Generally this works by:
  785. cat u-boot.bin u-boot.dtb >image.bin
  786. and in fact, U-Boot does this for you, creating a file called
  787. u-boot-dtb.bin which is useful in the common case. You can
  788. still use the individual files if you need something more
  789. exotic.
  790. - Watchdog:
  791. CONFIG_WATCHDOG
  792. If this variable is defined, it enables watchdog
  793. support for the SoC. There must be support in the SoC
  794. specific code for a watchdog. For the 8xx and 8260
  795. CPUs, the SIU Watchdog feature is enabled in the SYPCR
  796. register. When supported for a specific SoC is
  797. available, then no further board specific code should
  798. be needed to use it.
  799. CONFIG_HW_WATCHDOG
  800. When using a watchdog circuitry external to the used
  801. SoC, then define this variable and provide board
  802. specific code for the "hw_watchdog_reset" function.
  803. - U-Boot Version:
  804. CONFIG_VERSION_VARIABLE
  805. If this variable is defined, an environment variable
  806. named "ver" is created by U-Boot showing the U-Boot
  807. version as printed by the "version" command.
  808. Any change to this variable will be reverted at the
  809. next reset.
  810. - Real-Time Clock:
  811. When CONFIG_CMD_DATE is selected, the type of the RTC
  812. has to be selected, too. Define exactly one of the
  813. following options:
  814. CONFIG_RTC_MPC8xx - use internal RTC of MPC8xx
  815. CONFIG_RTC_PCF8563 - use Philips PCF8563 RTC
  816. CONFIG_RTC_MC13XXX - use MC13783 or MC13892 RTC
  817. CONFIG_RTC_MC146818 - use MC146818 RTC
  818. CONFIG_RTC_DS1307 - use Maxim, Inc. DS1307 RTC
  819. CONFIG_RTC_DS1337 - use Maxim, Inc. DS1337 RTC
  820. CONFIG_RTC_DS1338 - use Maxim, Inc. DS1338 RTC
  821. CONFIG_RTC_DS164x - use Dallas DS164x RTC
  822. CONFIG_RTC_ISL1208 - use Intersil ISL1208 RTC
  823. CONFIG_RTC_MAX6900 - use Maxim, Inc. MAX6900 RTC
  824. CONFIG_SYS_RTC_DS1337_NOOSC - Turn off the OSC output for DS1337
  825. CONFIG_SYS_RV3029_TCR - enable trickle charger on
  826. RV3029 RTC.
  827. Note that if the RTC uses I2C, then the I2C interface
  828. must also be configured. See I2C Support, below.
  829. - GPIO Support:
  830. CONFIG_PCA953X - use NXP's PCA953X series I2C GPIO
  831. CONFIG_PCA953X_INFO - enable pca953x info command
  832. The CONFIG_SYS_I2C_PCA953X_WIDTH option specifies a list of
  833. chip-ngpio pairs that tell the PCA953X driver the number of
  834. pins supported by a particular chip.
  835. Note that if the GPIO device uses I2C, then the I2C interface
  836. must also be configured. See I2C Support, below.
  837. - Timestamp Support:
  838. When CONFIG_TIMESTAMP is selected, the timestamp
  839. (date and time) of an image is printed by image
  840. commands like bootm or iminfo. This option is
  841. automatically enabled when you select CONFIG_CMD_DATE .
  842. - Partition Labels (disklabels) Supported:
  843. Zero or more of the following:
  844. CONFIG_MAC_PARTITION Apple's MacOS partition table.
  845. CONFIG_DOS_PARTITION MS Dos partition table, traditional on the
  846. Intel architecture, USB sticks, etc.
  847. CONFIG_ISO_PARTITION ISO partition table, used on CDROM etc.
  848. CONFIG_EFI_PARTITION GPT partition table, common when EFI is the
  849. bootloader. Note 2TB partition limit; see
  850. disk/part_efi.c
  851. CONFIG_MTD_PARTITIONS Memory Technology Device partition table.
  852. If IDE or SCSI support is enabled (CONFIG_CMD_IDE or
  853. CONFIG_CMD_SCSI) you must configure support for at
  854. least one non-MTD partition type as well.
  855. - IDE Reset method:
  856. CONFIG_IDE_RESET_ROUTINE - this is defined in several
  857. board configurations files but used nowhere!
  858. CONFIG_IDE_RESET - is this is defined, IDE Reset will
  859. be performed by calling the function
  860. ide_set_reset(int reset)
  861. which has to be defined in a board specific file
  862. - ATAPI Support:
  863. CONFIG_ATAPI
  864. Set this to enable ATAPI support.
  865. - LBA48 Support
  866. CONFIG_LBA48
  867. Set this to enable support for disks larger than 137GB
  868. Also look at CONFIG_SYS_64BIT_LBA.
  869. Whithout these , LBA48 support uses 32bit variables and will 'only'
  870. support disks up to 2.1TB.
  871. CONFIG_SYS_64BIT_LBA:
  872. When enabled, makes the IDE subsystem use 64bit sector addresses.
  873. Default is 32bit.
  874. - SCSI Support:
  875. At the moment only there is only support for the
  876. SYM53C8XX SCSI controller; define
  877. CONFIG_SCSI_SYM53C8XX to enable it.
  878. CONFIG_SYS_SCSI_MAX_LUN [8], CONFIG_SYS_SCSI_MAX_SCSI_ID [7] and
  879. CONFIG_SYS_SCSI_MAX_DEVICE [CONFIG_SYS_SCSI_MAX_SCSI_ID *
  880. CONFIG_SYS_SCSI_MAX_LUN] can be adjusted to define the
  881. maximum numbers of LUNs, SCSI ID's and target
  882. devices.
  883. CONFIG_SYS_SCSI_SYM53C8XX_CCF to fix clock timing (80Mhz)
  884. The environment variable 'scsidevs' is set to the number of
  885. SCSI devices found during the last scan.
  886. - NETWORK Support (PCI):
  887. CONFIG_E1000
  888. Support for Intel 8254x/8257x gigabit chips.
  889. CONFIG_E1000_SPI
  890. Utility code for direct access to the SPI bus on Intel 8257x.
  891. This does not do anything useful unless you set at least one
  892. of CONFIG_CMD_E1000 or CONFIG_E1000_SPI_GENERIC.
  893. CONFIG_E1000_SPI_GENERIC
  894. Allow generic access to the SPI bus on the Intel 8257x, for
  895. example with the "sspi" command.
  896. CONFIG_CMD_E1000
  897. Management command for E1000 devices. When used on devices
  898. with SPI support you can reprogram the EEPROM from U-Boot.
  899. CONFIG_E1000_FALLBACK_MAC
  900. default MAC for empty EEPROM after production.
  901. CONFIG_EEPRO100
  902. Support for Intel 82557/82559/82559ER chips.
  903. Optional CONFIG_EEPRO100_SROM_WRITE enables EEPROM
  904. write routine for first time initialisation.
  905. CONFIG_TULIP
  906. Support for Digital 2114x chips.
  907. Optional CONFIG_TULIP_SELECT_MEDIA for board specific
  908. modem chip initialisation (KS8761/QS6611).
  909. CONFIG_NATSEMI
  910. Support for National dp83815 chips.
  911. CONFIG_NS8382X
  912. Support for National dp8382[01] gigabit chips.
  913. - NETWORK Support (other):
  914. CONFIG_DRIVER_AT91EMAC
  915. Support for AT91RM9200 EMAC.
  916. CONFIG_RMII
  917. Define this to use reduced MII inteface
  918. CONFIG_DRIVER_AT91EMAC_QUIET
  919. If this defined, the driver is quiet.
  920. The driver doen't show link status messages.
  921. CONFIG_CALXEDA_XGMAC
  922. Support for the Calxeda XGMAC device
  923. CONFIG_LAN91C96
  924. Support for SMSC's LAN91C96 chips.
  925. CONFIG_LAN91C96_BASE
  926. Define this to hold the physical address
  927. of the LAN91C96's I/O space
  928. CONFIG_LAN91C96_USE_32_BIT
  929. Define this to enable 32 bit addressing
  930. CONFIG_SMC91111
  931. Support for SMSC's LAN91C111 chip
  932. CONFIG_SMC91111_BASE
  933. Define this to hold the physical address
  934. of the device (I/O space)
  935. CONFIG_SMC_USE_32_BIT
  936. Define this if data bus is 32 bits
  937. CONFIG_SMC_USE_IOFUNCS
  938. Define this to use i/o functions instead of macros
  939. (some hardware wont work with macros)
  940. CONFIG_DRIVER_TI_EMAC
  941. Support for davinci emac
  942. CONFIG_SYS_DAVINCI_EMAC_PHY_COUNT
  943. Define this if you have more then 3 PHYs.
  944. CONFIG_FTGMAC100
  945. Support for Faraday's FTGMAC100 Gigabit SoC Ethernet
  946. CONFIG_FTGMAC100_EGIGA
  947. Define this to use GE link update with gigabit PHY.
  948. Define this if FTGMAC100 is connected to gigabit PHY.
  949. If your system has 10/100 PHY only, it might not occur
  950. wrong behavior. Because PHY usually return timeout or
  951. useless data when polling gigabit status and gigabit
  952. control registers. This behavior won't affect the
  953. correctnessof 10/100 link speed update.
  954. CONFIG_SMC911X
  955. Support for SMSC's LAN911x and LAN921x chips
  956. CONFIG_SMC911X_BASE
  957. Define this to hold the physical address
  958. of the device (I/O space)
  959. CONFIG_SMC911X_32_BIT
  960. Define this if data bus is 32 bits
  961. CONFIG_SMC911X_16_BIT
  962. Define this if data bus is 16 bits. If your processor
  963. automatically converts one 32 bit word to two 16 bit
  964. words you may also try CONFIG_SMC911X_32_BIT.
  965. CONFIG_SH_ETHER
  966. Support for Renesas on-chip Ethernet controller
  967. CONFIG_SH_ETHER_USE_PORT
  968. Define the number of ports to be used
  969. CONFIG_SH_ETHER_PHY_ADDR
  970. Define the ETH PHY's address
  971. CONFIG_SH_ETHER_CACHE_WRITEBACK
  972. If this option is set, the driver enables cache flush.
  973. - TPM Support:
  974. CONFIG_TPM
  975. Support TPM devices.
  976. CONFIG_TPM_TIS_I2C
  977. Support for i2c bus TPM devices. Only one device
  978. per system is supported at this time.
  979. CONFIG_TPM_TIS_I2C_BUS_NUMBER
  980. Define the the i2c bus number for the TPM device
  981. CONFIG_TPM_TIS_I2C_SLAVE_ADDRESS
  982. Define the TPM's address on the i2c bus
  983. CONFIG_TPM_TIS_I2C_BURST_LIMITATION
  984. Define the burst count bytes upper limit
  985. CONFIG_TPM_ATMEL_TWI
  986. Support for Atmel TWI TPM device. Requires I2C support.
  987. CONFIG_TPM_TIS_LPC
  988. Support for generic parallel port TPM devices. Only one device
  989. per system is supported at this time.
  990. CONFIG_TPM_TIS_BASE_ADDRESS
  991. Base address where the generic TPM device is mapped
  992. to. Contemporary x86 systems usually map it at
  993. 0xfed40000.
  994. CONFIG_CMD_TPM
  995. Add tpm monitor functions.
  996. Requires CONFIG_TPM. If CONFIG_TPM_AUTH_SESSIONS is set, also
  997. provides monitor access to authorized functions.
  998. CONFIG_TPM
  999. Define this to enable the TPM support library which provides
  1000. functional interfaces to some TPM commands.
  1001. Requires support for a TPM device.
  1002. CONFIG_TPM_AUTH_SESSIONS
  1003. Define this to enable authorized functions in the TPM library.
  1004. Requires CONFIG_TPM and CONFIG_SHA1.
  1005. - USB Support:
  1006. At the moment only the UHCI host controller is
  1007. supported (PIP405, MIP405, MPC5200); define
  1008. CONFIG_USB_UHCI to enable it.
  1009. define CONFIG_USB_KEYBOARD to enable the USB Keyboard
  1010. and define CONFIG_USB_STORAGE to enable the USB
  1011. storage devices.
  1012. Note:
  1013. Supported are USB Keyboards and USB Floppy drives
  1014. (TEAC FD-05PUB).
  1015. MPC5200 USB requires additional defines:
  1016. CONFIG_USB_CLOCK
  1017. for 528 MHz Clock: 0x0001bbbb
  1018. CONFIG_PSC3_USB
  1019. for USB on PSC3
  1020. CONFIG_USB_CONFIG
  1021. for differential drivers: 0x00001000
  1022. for single ended drivers: 0x00005000
  1023. for differential drivers on PSC3: 0x00000100
  1024. for single ended drivers on PSC3: 0x00004100
  1025. CONFIG_SYS_USB_EVENT_POLL
  1026. May be defined to allow interrupt polling
  1027. instead of using asynchronous interrupts
  1028. CONFIG_USB_EHCI_TXFIFO_THRESH enables setting of the
  1029. txfilltuning field in the EHCI controller on reset.
  1030. CONFIG_USB_HUB_MIN_POWER_ON_DELAY defines the minimum
  1031. interval for usb hub power-on delay.(minimum 100msec)
  1032. - USB Device:
  1033. Define the below if you wish to use the USB console.
  1034. Once firmware is rebuilt from a serial console issue the
  1035. command "setenv stdin usbtty; setenv stdout usbtty" and
  1036. attach your USB cable. The Unix command "dmesg" should print
  1037. it has found a new device. The environment variable usbtty
  1038. can be set to gserial or cdc_acm to enable your device to
  1039. appear to a USB host as a Linux gserial device or a
  1040. Common Device Class Abstract Control Model serial device.
  1041. If you select usbtty = gserial you should be able to enumerate
  1042. a Linux host by
  1043. # modprobe usbserial vendor=0xVendorID product=0xProductID
  1044. else if using cdc_acm, simply setting the environment
  1045. variable usbtty to be cdc_acm should suffice. The following
  1046. might be defined in YourBoardName.h
  1047. CONFIG_USB_DEVICE
  1048. Define this to build a UDC device
  1049. CONFIG_USB_TTY
  1050. Define this to have a tty type of device available to
  1051. talk to the UDC device
  1052. CONFIG_USBD_HS
  1053. Define this to enable the high speed support for usb
  1054. device and usbtty. If this feature is enabled, a routine
  1055. int is_usbd_high_speed(void)
  1056. also needs to be defined by the driver to dynamically poll
  1057. whether the enumeration has succeded at high speed or full
  1058. speed.
  1059. CONFIG_SYS_CONSOLE_IS_IN_ENV
  1060. Define this if you want stdin, stdout &/or stderr to
  1061. be set to usbtty.
  1062. mpc8xx:
  1063. CONFIG_SYS_USB_EXTC_CLK 0xBLAH
  1064. Derive USB clock from external clock "blah"
  1065. - CONFIG_SYS_USB_EXTC_CLK 0x02
  1066. CONFIG_SYS_USB_BRG_CLK 0xBLAH
  1067. Derive USB clock from brgclk
  1068. - CONFIG_SYS_USB_BRG_CLK 0x04
  1069. If you have a USB-IF assigned VendorID then you may wish to
  1070. define your own vendor specific values either in BoardName.h
  1071. or directly in usbd_vendor_info.h. If you don't define
  1072. CONFIG_USBD_MANUFACTURER, CONFIG_USBD_PRODUCT_NAME,
  1073. CONFIG_USBD_VENDORID and CONFIG_USBD_PRODUCTID, then U-Boot
  1074. should pretend to be a Linux device to it's target host.
  1075. CONFIG_USBD_MANUFACTURER
  1076. Define this string as the name of your company for
  1077. - CONFIG_USBD_MANUFACTURER "my company"
  1078. CONFIG_USBD_PRODUCT_NAME
  1079. Define this string as the name of your product
  1080. - CONFIG_USBD_PRODUCT_NAME "acme usb device"
  1081. CONFIG_USBD_VENDORID
  1082. Define this as your assigned Vendor ID from the USB
  1083. Implementors Forum. This *must* be a genuine Vendor ID
  1084. to avoid polluting the USB namespace.
  1085. - CONFIG_USBD_VENDORID 0xFFFF
  1086. CONFIG_USBD_PRODUCTID
  1087. Define this as the unique Product ID
  1088. for your device
  1089. - CONFIG_USBD_PRODUCTID 0xFFFF
  1090. - ULPI Layer Support:
  1091. The ULPI (UTMI Low Pin (count) Interface) PHYs are supported via
  1092. the generic ULPI layer. The generic layer accesses the ULPI PHY
  1093. via the platform viewport, so you need both the genric layer and
  1094. the viewport enabled. Currently only Chipidea/ARC based
  1095. viewport is supported.
  1096. To enable the ULPI layer support, define CONFIG_USB_ULPI and
  1097. CONFIG_USB_ULPI_VIEWPORT in your board configuration file.
  1098. If your ULPI phy needs a different reference clock than the
  1099. standard 24 MHz then you have to define CONFIG_ULPI_REF_CLK to
  1100. the appropriate value in Hz.
  1101. - MMC Support:
  1102. The MMC controller on the Intel PXA is supported. To
  1103. enable this define CONFIG_MMC. The MMC can be
  1104. accessed from the boot prompt by mapping the device
  1105. to physical memory similar to flash. Command line is
  1106. enabled with CONFIG_CMD_MMC. The MMC driver also works with
  1107. the FAT fs. This is enabled with CONFIG_CMD_FAT.
  1108. CONFIG_SH_MMCIF
  1109. Support for Renesas on-chip MMCIF controller
  1110. CONFIG_SH_MMCIF_ADDR
  1111. Define the base address of MMCIF registers
  1112. CONFIG_SH_MMCIF_CLK
  1113. Define the clock frequency for MMCIF
  1114. - USB Device Firmware Update (DFU) class support:
  1115. CONFIG_DFU_FUNCTION
  1116. This enables the USB portion of the DFU USB class
  1117. CONFIG_CMD_DFU
  1118. This enables the command "dfu" which is used to have
  1119. U-Boot create a DFU class device via USB. This command
  1120. requires that the "dfu_alt_info" environment variable be
  1121. set and define the alt settings to expose to the host.
  1122. CONFIG_DFU_MMC
  1123. This enables support for exposing (e)MMC devices via DFU.
  1124. CONFIG_DFU_NAND
  1125. This enables support for exposing NAND devices via DFU.
  1126. CONFIG_SYS_DFU_DATA_BUF_SIZE
  1127. Dfu transfer uses a buffer before writing data to the
  1128. raw storage device. Make the size (in bytes) of this buffer
  1129. configurable. The size of this buffer is also configurable
  1130. through the "dfu_bufsiz" environment variable.
  1131. CONFIG_SYS_DFU_MAX_FILE_SIZE
  1132. When updating files rather than the raw storage device,
  1133. we use a static buffer to copy the file into and then write
  1134. the buffer once we've been given the whole file. Define
  1135. this to the maximum filesize (in bytes) for the buffer.
  1136. Default is 4 MiB if undefined.
  1137. - Journaling Flash filesystem support:
  1138. CONFIG_JFFS2_NAND, CONFIG_JFFS2_NAND_OFF, CONFIG_JFFS2_NAND_SIZE,
  1139. CONFIG_JFFS2_NAND_DEV
  1140. Define these for a default partition on a NAND device
  1141. CONFIG_SYS_JFFS2_FIRST_SECTOR,
  1142. CONFIG_SYS_JFFS2_FIRST_BANK, CONFIG_SYS_JFFS2_NUM_BANKS
  1143. Define these for a default partition on a NOR device
  1144. CONFIG_SYS_JFFS_CUSTOM_PART
  1145. Define this to create an own partition. You have to provide a
  1146. function struct part_info* jffs2_part_info(int part_num)
  1147. If you define only one JFFS2 partition you may also want to
  1148. #define CONFIG_SYS_JFFS_SINGLE_PART 1
  1149. to disable the command chpart. This is the default when you
  1150. have not defined a custom partition
  1151. - FAT(File Allocation Table) filesystem write function support:
  1152. CONFIG_FAT_WRITE
  1153. Define this to enable support for saving memory data as a
  1154. file in FAT formatted partition.
  1155. This will also enable the command "fatwrite" enabling the
  1156. user to write files to FAT.
  1157. CBFS (Coreboot Filesystem) support
  1158. CONFIG_CMD_CBFS
  1159. Define this to enable support for reading from a Coreboot
  1160. filesystem. Available commands are cbfsinit, cbfsinfo, cbfsls
  1161. and cbfsload.
  1162. - Keyboard Support:
  1163. CONFIG_ISA_KEYBOARD
  1164. Define this to enable standard (PC-Style) keyboard
  1165. support
  1166. CONFIG_I8042_KBD
  1167. Standard PC keyboard driver with US (is default) and
  1168. GERMAN key layout (switch via environment 'keymap=de') support.
  1169. Export function i8042_kbd_init, i8042_tstc and i8042_getc
  1170. for cfb_console. Supports cursor blinking.
  1171. CONFIG_CROS_EC_KEYB
  1172. Enables a Chrome OS keyboard using the CROS_EC interface.
  1173. This uses CROS_EC to communicate with a second microcontroller
  1174. which provides key scans on request.
  1175. - Video support:
  1176. CONFIG_VIDEO
  1177. Define this to enable video support (for output to
  1178. video).
  1179. CONFIG_VIDEO_CT69000
  1180. Enable Chips & Technologies 69000 Video chip
  1181. CONFIG_VIDEO_SMI_LYNXEM
  1182. Enable Silicon Motion SMI 712/710/810 Video chip. The
  1183. video output is selected via environment 'videoout'
  1184. (1 = LCD and 2 = CRT). If videoout is undefined, CRT is
  1185. assumed.
  1186. For the CT69000 and SMI_LYNXEM drivers, videomode is
  1187. selected via environment 'videomode'. Two different ways
  1188. are possible:
  1189. - "videomode=num" 'num' is a standard LiLo mode numbers.
  1190. Following standard modes are supported (* is default):
  1191. Colors 640x480 800x600 1024x768 1152x864 1280x1024
  1192. -------------+---------------------------------------------
  1193. 8 bits | 0x301* 0x303 0x305 0x161 0x307
  1194. 15 bits | 0x310 0x313 0x316 0x162 0x319
  1195. 16 bits | 0x311 0x314 0x317 0x163 0x31A
  1196. 24 bits | 0x312 0x315 0x318 ? 0x31B
  1197. -------------+---------------------------------------------
  1198. (i.e. setenv videomode 317; saveenv; reset;)
  1199. - "videomode=bootargs" all the video parameters are parsed
  1200. from the bootargs. (See drivers/video/videomodes.c)
  1201. CONFIG_VIDEO_SED13806
  1202. Enable Epson SED13806 driver. This driver supports 8bpp
  1203. and 16bpp modes defined by CONFIG_VIDEO_SED13806_8BPP
  1204. or CONFIG_VIDEO_SED13806_16BPP
  1205. CONFIG_FSL_DIU_FB
  1206. Enable the Freescale DIU video driver. Reference boards for
  1207. SOCs that have a DIU should define this macro to enable DIU
  1208. support, and should also define these other macros:
  1209. CONFIG_SYS_DIU_ADDR
  1210. CONFIG_VIDEO
  1211. CONFIG_CMD_BMP
  1212. CONFIG_CFB_CONSOLE
  1213. CONFIG_VIDEO_SW_CURSOR
  1214. CONFIG_VGA_AS_SINGLE_DEVICE
  1215. CONFIG_VIDEO_LOGO
  1216. CONFIG_VIDEO_BMP_LOGO
  1217. The DIU driver will look for the 'video-mode' environment
  1218. variable, and if defined, enable the DIU as a console during
  1219. boot. See the documentation file README.video for a
  1220. description of this variable.
  1221. CONFIG_VIDEO_VGA
  1222. Enable the VGA video / BIOS for x86. The alternative if you
  1223. are using coreboot is to use the coreboot frame buffer
  1224. driver.
  1225. - Keyboard Support:
  1226. CONFIG_KEYBOARD
  1227. Define this to enable a custom keyboard support.
  1228. This simply calls drv_keyboard_init() which must be
  1229. defined in your board-specific files.
  1230. The only board using this so far is RBC823.
  1231. - LCD Support: CONFIG_LCD
  1232. Define this to enable LCD support (for output to LCD
  1233. display); also select one of the supported displays
  1234. by defining one of these:
  1235. CONFIG_ATMEL_LCD:
  1236. HITACHI TX09D70VM1CCA, 3.5", 240x320.
  1237. CONFIG_NEC_NL6448AC33:
  1238. NEC NL6448AC33-18. Active, color, single scan.
  1239. CONFIG_NEC_NL6448BC20
  1240. NEC NL6448BC20-08. 6.5", 640x480.
  1241. Active, color, single scan.
  1242. CONFIG_NEC_NL6448BC33_54
  1243. NEC NL6448BC33-54. 10.4", 640x480.
  1244. Active, color, single scan.
  1245. CONFIG_SHARP_16x9
  1246. Sharp 320x240. Active, color, single scan.
  1247. It isn't 16x9, and I am not sure what it is.
  1248. CONFIG_SHARP_LQ64D341
  1249. Sharp LQ64D341 display, 640x480.
  1250. Active, color, single scan.
  1251. CONFIG_HLD1045
  1252. HLD1045 display, 640x480.
  1253. Active, color, single scan.
  1254. CONFIG_OPTREX_BW
  1255. Optrex CBL50840-2 NF-FW 99 22 M5
  1256. or
  1257. Hitachi LMG6912RPFC-00T
  1258. or
  1259. Hitachi SP14Q002
  1260. 320x240. Black & white.
  1261. Normally display is black on white background; define
  1262. CONFIG_SYS_WHITE_ON_BLACK to get it inverted.
  1263. CONFIG_LCD_ALIGNMENT
  1264. Normally the LCD is page-aligned (tyically 4KB). If this is
  1265. defined then the LCD will be aligned to this value instead.
  1266. For ARM it is sometimes useful to use MMU_SECTION_SIZE
  1267. here, since it is cheaper to change data cache settings on
  1268. a per-section basis.
  1269. CONFIG_CONSOLE_SCROLL_LINES
  1270. When the console need to be scrolled, this is the number of
  1271. lines to scroll by. It defaults to 1. Increasing this makes
  1272. the console jump but can help speed up operation when scrolling
  1273. is slow.
  1274. CONFIG_LCD_BMP_RLE8
  1275. Support drawing of RLE8-compressed bitmaps on the LCD.
  1276. CONFIG_I2C_EDID
  1277. Enables an 'i2c edid' command which can read EDID
  1278. information over I2C from an attached LCD display.
  1279. - Splash Screen Support: CONFIG_SPLASH_SCREEN
  1280. If this option is set, the environment is checked for
  1281. a variable "splashimage". If found, the usual display
  1282. of logo, copyright and system information on the LCD
  1283. is suppressed and the BMP image at the address
  1284. specified in "splashimage" is loaded instead. The
  1285. console is redirected to the "nulldev", too. This
  1286. allows for a "silent" boot where a splash screen is
  1287. loaded very quickly after power-on.
  1288. CONFIG_SPLASHIMAGE_GUARD
  1289. If this option is set, then U-Boot will prevent the environment
  1290. variable "splashimage" from being set to a problematic address
  1291. (see README.displaying-bmps and README.arm-unaligned-accesses).
  1292. This option is useful for targets where, due to alignment
  1293. restrictions, an improperly aligned BMP image will cause a data
  1294. abort. If you think you will not have problems with unaligned
  1295. accesses (for example because your toolchain prevents them)
  1296. there is no need to set this option.
  1297. CONFIG_SPLASH_SCREEN_ALIGN
  1298. If this option is set the splash image can be freely positioned
  1299. on the screen. Environment variable "splashpos" specifies the
  1300. position as "x,y". If a positive number is given it is used as
  1301. number of pixel from left/top. If a negative number is given it
  1302. is used as number of pixel from right/bottom. You can also
  1303. specify 'm' for centering the image.
  1304. Example:
  1305. setenv splashpos m,m
  1306. => image at center of screen
  1307. setenv splashpos 30,20
  1308. => image at x = 30 and y = 20
  1309. setenv splashpos -10,m
  1310. => vertically centered image
  1311. at x = dspWidth - bmpWidth - 9
  1312. - Gzip compressed BMP image support: CONFIG_VIDEO_BMP_GZIP
  1313. If this option is set, additionally to standard BMP
  1314. images, gzipped BMP images can be displayed via the
  1315. splashscreen support or the bmp command.
  1316. - Run length encoded BMP image (RLE8) support: CONFIG_VIDEO_BMP_RLE8
  1317. If this option is set, 8-bit RLE compressed BMP images
  1318. can be displayed via the splashscreen support or the
  1319. bmp command.
  1320. - Do compresssing for memory range:
  1321. CONFIG_CMD_ZIP
  1322. If this option is set, it would use zlib deflate method
  1323. to compress the specified memory at its best effort.
  1324. - Compression support:
  1325. CONFIG_GZIP
  1326. Enabled by default to support gzip compressed images.
  1327. CONFIG_BZIP2
  1328. If this option is set, support for bzip2 compressed
  1329. images is included. If not, only uncompressed and gzip
  1330. compressed images are supported.
  1331. NOTE: the bzip2 algorithm requires a lot of RAM, so
  1332. the malloc area (as defined by CONFIG_SYS_MALLOC_LEN) should
  1333. be at least 4MB.
  1334. CONFIG_LZMA
  1335. If this option is set, support for lzma compressed
  1336. images is included.
  1337. Note: The LZMA algorithm adds between 2 and 4KB of code and it
  1338. requires an amount of dynamic memory that is given by the
  1339. formula:
  1340. (1846 + 768 << (lc + lp)) * sizeof(uint16)
  1341. Where lc and lp stand for, respectively, Literal context bits
  1342. and Literal pos bits.
  1343. This value is upper-bounded by 14MB in the worst case. Anyway,
  1344. for a ~4MB large kernel image, we have lc=3 and lp=0 for a
  1345. total amount of (1846 + 768 << (3 + 0)) * 2 = ~41KB... that is
  1346. a very small buffer.
  1347. Use the lzmainfo tool to determinate the lc and lp values and
  1348. then calculate the amount of needed dynamic memory (ensuring
  1349. the appropriate CONFIG_SYS_MALLOC_LEN value).
  1350. CONFIG_LZO
  1351. If this option is set, support for LZO compressed images
  1352. is included.
  1353. - MII/PHY support:
  1354. CONFIG_PHY_ADDR
  1355. The address of PHY on MII bus.
  1356. CONFIG_PHY_CLOCK_FREQ (ppc4xx)
  1357. The clock frequency of the MII bus
  1358. CONFIG_PHY_GIGE
  1359. If this option is set, support for speed/duplex
  1360. detection of gigabit PHY is included.
  1361. CONFIG_PHY_RESET_DELAY
  1362. Some PHY like Intel LXT971A need extra delay after
  1363. reset before any MII register access is possible.
  1364. For such PHY, set this option to the usec delay
  1365. required. (minimum 300usec for LXT971A)
  1366. CONFIG_PHY_CMD_DELAY (ppc4xx)
  1367. Some PHY like Intel LXT971A need extra delay after
  1368. command issued before MII status register can be read
  1369. - Ethernet address:
  1370. CONFIG_ETHADDR
  1371. CONFIG_ETH1ADDR
  1372. CONFIG_ETH2ADDR
  1373. CONFIG_ETH3ADDR
  1374. CONFIG_ETH4ADDR
  1375. CONFIG_ETH5ADDR
  1376. Define a default value for Ethernet address to use
  1377. for the respective Ethernet interface, in case this
  1378. is not determined automatically.
  1379. - IP address:
  1380. CONFIG_IPADDR
  1381. Define a default value for the IP address to use for
  1382. the default Ethernet interface, in case this is not
  1383. determined through e.g. bootp.
  1384. (Environment variable "ipaddr")
  1385. - Server IP address:
  1386. CONFIG_SERVERIP
  1387. Defines a default value for the IP address of a TFTP
  1388. server to contact when using the "tftboot" command.
  1389. (Environment variable "serverip")
  1390. CONFIG_KEEP_SERVERADDR
  1391. Keeps the server's MAC address, in the env 'serveraddr'
  1392. for passing to bootargs (like Linux's netconsole option)
  1393. - Gateway IP address:
  1394. CONFIG_GATEWAYIP
  1395. Defines a default value for the IP address of the
  1396. default router where packets to other networks are
  1397. sent to.
  1398. (Environment variable "gatewayip")
  1399. - Subnet mask:
  1400. CONFIG_NETMASK
  1401. Defines a default value for the subnet mask (or
  1402. routing prefix) which is used to determine if an IP
  1403. address belongs to the local subnet or needs to be
  1404. forwarded through a router.
  1405. (Environment variable "netmask")
  1406. - Multicast TFTP Mode:
  1407. CONFIG_MCAST_TFTP
  1408. Defines whether you want to support multicast TFTP as per
  1409. rfc-2090; for example to work with atftp. Lets lots of targets
  1410. tftp down the same boot image concurrently. Note: the Ethernet
  1411. driver in use must provide a function: mcast() to join/leave a
  1412. multicast group.
  1413. - BOOTP Recovery Mode:
  1414. CONFIG_BOOTP_RANDOM_DELAY
  1415. If you have many targets in a network that try to
  1416. boot using BOOTP, you may want to avoid that all
  1417. systems send out BOOTP requests at precisely the same
  1418. moment (which would happen for instance at recovery
  1419. from a power failure, when all systems will try to
  1420. boot, thus flooding the BOOTP server. Defining
  1421. CONFIG_BOOTP_RANDOM_DELAY causes a random delay to be
  1422. inserted before sending out BOOTP requests. The
  1423. following delays are inserted then:
  1424. 1st BOOTP request: delay 0 ... 1 sec
  1425. 2nd BOOTP request: delay 0 ... 2 sec
  1426. 3rd BOOTP request: delay 0 ... 4 sec
  1427. 4th and following
  1428. BOOTP requests: delay 0 ... 8 sec
  1429. - DHCP Advanced Options:
  1430. You can fine tune the DHCP functionality by defining
  1431. CONFIG_BOOTP_* symbols:
  1432. CONFIG_BOOTP_SUBNETMASK
  1433. CONFIG_BOOTP_GATEWAY
  1434. CONFIG_BOOTP_HOSTNAME
  1435. CONFIG_BOOTP_NISDOMAIN
  1436. CONFIG_BOOTP_BOOTPATH
  1437. CONFIG_BOOTP_BOOTFILESIZE
  1438. CONFIG_BOOTP_DNS
  1439. CONFIG_BOOTP_DNS2
  1440. CONFIG_BOOTP_SEND_HOSTNAME
  1441. CONFIG_BOOTP_NTPSERVER
  1442. CONFIG_BOOTP_TIMEOFFSET
  1443. CONFIG_BOOTP_VENDOREX
  1444. CONFIG_BOOTP_MAY_FAIL
  1445. CONFIG_BOOTP_SERVERIP - TFTP server will be the serverip
  1446. environment variable, not the BOOTP server.
  1447. CONFIG_BOOTP_MAY_FAIL - If the DHCP server is not found
  1448. after the configured retry count, the call will fail
  1449. instead of starting over. This can be used to fail over
  1450. to Link-local IP address configuration if the DHCP server
  1451. is not available.
  1452. CONFIG_BOOTP_DNS2 - If a DHCP client requests the DNS
  1453. serverip from a DHCP server, it is possible that more
  1454. than one DNS serverip is offered to the client.
  1455. If CONFIG_BOOTP_DNS2 is enabled, the secondary DNS
  1456. serverip will be stored in the additional environment
  1457. variable "dnsip2". The first DNS serverip is always
  1458. stored in the variable "dnsip", when CONFIG_BOOTP_DNS
  1459. is defined.
  1460. CONFIG_BOOTP_SEND_HOSTNAME - Some DHCP servers are capable
  1461. to do a dynamic update of a DNS server. To do this, they
  1462. need the hostname of the DHCP requester.
  1463. If CONFIG_BOOTP_SEND_HOSTNAME is defined, the content
  1464. of the "hostname" environment variable is passed as
  1465. option 12 to the DHCP server.
  1466. CONFIG_BOOTP_DHCP_REQUEST_DELAY
  1467. A 32bit value in microseconds for a delay between
  1468. receiving a "DHCP Offer" and sending the "DHCP Request".
  1469. This fixes a problem with certain DHCP servers that don't
  1470. respond 100% of the time to a "DHCP request". E.g. On an
  1471. AT91RM9200 processor running at 180MHz, this delay needed
  1472. to be *at least* 15,000 usec before a Windows Server 2003
  1473. DHCP server would reply 100% of the time. I recommend at
  1474. least 50,000 usec to be safe. The alternative is to hope
  1475. that one of the retries will be successful but note that
  1476. the DHCP timeout and retry process takes a longer than
  1477. this delay.
  1478. - Link-local IP address negotiation:
  1479. Negotiate with other link-local clients on the local network
  1480. for an address that doesn't require explicit configuration.
  1481. This is especially useful if a DHCP server cannot be guaranteed
  1482. to exist in all environments that the device must operate.
  1483. See doc/README.link-local for more information.
  1484. - CDP Options:
  1485. CONFIG_CDP_DEVICE_ID
  1486. The device id used in CDP trigger frames.
  1487. CONFIG_CDP_DEVICE_ID_PREFIX
  1488. A two character string which is prefixed to the MAC address
  1489. of the device.
  1490. CONFIG_CDP_PORT_ID
  1491. A printf format string which contains the ascii name of
  1492. the port. Normally is set to "eth%d" which sets
  1493. eth0 for the first Ethernet, eth1 for the second etc.
  1494. CONFIG_CDP_CAPABILITIES
  1495. A 32bit integer which indicates the device capabilities;
  1496. 0x00000010 for a normal host which does not forwards.
  1497. CONFIG_CDP_VERSION
  1498. An ascii string containing the version of the software.
  1499. CONFIG_CDP_PLATFORM
  1500. An ascii string containing the name of the platform.
  1501. CONFIG_CDP_TRIGGER
  1502. A 32bit integer sent on the trigger.
  1503. CONFIG_CDP_POWER_CONSUMPTION
  1504. A 16bit integer containing the power consumption of the
  1505. device in .1 of milliwatts.
  1506. CONFIG_CDP_APPLIANCE_VLAN_TYPE
  1507. A byte containing the id of the VLAN.
  1508. - Status LED: CONFIG_STATUS_LED
  1509. Several configurations allow to display the current
  1510. status using a LED. For instance, the LED will blink
  1511. fast while running U-Boot code, stop blinking as
  1512. soon as a reply to a BOOTP request was received, and
  1513. start blinking slow once the Linux kernel is running
  1514. (supported by a status LED driver in the Linux
  1515. kernel). Defining CONFIG_STATUS_LED enables this
  1516. feature in U-Boot.
  1517. - CAN Support: CONFIG_CAN_DRIVER
  1518. Defining CONFIG_CAN_DRIVER enables CAN driver support
  1519. on those systems that support this (optional)
  1520. feature, like the TQM8xxL modules.
  1521. - I2C Support: CONFIG_SYS_I2C
  1522. This enable the NEW i2c subsystem, and will allow you to use
  1523. i2c commands at the u-boot command line (as long as you set
  1524. CONFIG_CMD_I2C in CONFIG_COMMANDS) and communicate with i2c
  1525. based realtime clock chips or other i2c devices. See
  1526. common/cmd_i2c.c for a description of the command line
  1527. interface.
  1528. ported i2c driver to the new framework:
  1529. - drivers/i2c/soft_i2c.c:
  1530. - activate first bus with CONFIG_SYS_I2C_SOFT define
  1531. CONFIG_SYS_I2C_SOFT_SPEED and CONFIG_SYS_I2C_SOFT_SLAVE
  1532. for defining speed and slave address
  1533. - activate second bus with I2C_SOFT_DECLARATIONS2 define
  1534. CONFIG_SYS_I2C_SOFT_SPEED_2 and CONFIG_SYS_I2C_SOFT_SLAVE_2
  1535. for defining speed and slave address
  1536. - activate third bus with I2C_SOFT_DECLARATIONS3 define
  1537. CONFIG_SYS_I2C_SOFT_SPEED_3 and CONFIG_SYS_I2C_SOFT_SLAVE_3
  1538. for defining speed and slave address
  1539. - activate fourth bus with I2C_SOFT_DECLARATIONS4 define
  1540. CONFIG_SYS_I2C_SOFT_SPEED_4 and CONFIG_SYS_I2C_SOFT_SLAVE_4
  1541. for defining speed and slave address
  1542. - drivers/i2c/fsl_i2c.c:
  1543. - activate i2c driver with CONFIG_SYS_I2C_FSL
  1544. define CONFIG_SYS_FSL_I2C_OFFSET for setting the register
  1545. offset CONFIG_SYS_FSL_I2C_SPEED for the i2c speed and
  1546. CONFIG_SYS_FSL_I2C_SLAVE for the slave addr of the first
  1547. bus.
  1548. - If your board supports a second fsl i2c bus, define
  1549. CONFIG_SYS_FSL_I2C2_OFFSET for the register offset
  1550. CONFIG_SYS_FSL_I2C2_SPEED for the speed and
  1551. CONFIG_SYS_FSL_I2C2_SLAVE for the slave address of the
  1552. second bus.
  1553. - drivers/i2c/tegra_i2c.c:
  1554. - activate this driver with CONFIG_SYS_I2C_TEGRA
  1555. - This driver adds 4 i2c buses with a fix speed from
  1556. 100000 and the slave addr 0!
  1557. - drivers/i2c/ppc4xx_i2c.c
  1558. - activate this driver with CONFIG_SYS_I2C_PPC4XX
  1559. - CONFIG_SYS_I2C_PPC4XX_CH0 activate hardware channel 0
  1560. - CONFIG_SYS_I2C_PPC4XX_CH1 activate hardware channel 1
  1561. additional defines:
  1562. CONFIG_SYS_NUM_I2C_BUSES
  1563. Hold the number of i2c busses you want to use. If you
  1564. don't use/have i2c muxes on your i2c bus, this
  1565. is equal to CONFIG_SYS_NUM_I2C_ADAPTERS, and you can
  1566. omit this define.
  1567. CONFIG_SYS_I2C_DIRECT_BUS
  1568. define this, if you don't use i2c muxes on your hardware.
  1569. if CONFIG_SYS_I2C_MAX_HOPS is not defined or == 0 you can
  1570. omit this define.
  1571. CONFIG_SYS_I2C_MAX_HOPS
  1572. define how many muxes are maximal consecutively connected
  1573. on one i2c bus. If you not use i2c muxes, omit this
  1574. define.
  1575. CONFIG_SYS_I2C_BUSES
  1576. hold a list of busses you want to use, only used if
  1577. CONFIG_SYS_I2C_DIRECT_BUS is not defined, for example
  1578. a board with CONFIG_SYS_I2C_MAX_HOPS = 1 and
  1579. CONFIG_SYS_NUM_I2C_BUSES = 9:
  1580. CONFIG_SYS_I2C_BUSES {{0, {I2C_NULL_HOP}}, \
  1581. {0, {{I2C_MUX_PCA9547, 0x70, 1}}}, \
  1582. {0, {{I2C_MUX_PCA9547, 0x70, 2}}}, \
  1583. {0, {{I2C_MUX_PCA9547, 0x70, 3}}}, \
  1584. {0, {{I2C_MUX_PCA9547, 0x70, 4}}}, \
  1585. {0, {{I2C_MUX_PCA9547, 0x70, 5}}}, \
  1586. {1, {I2C_NULL_HOP}}, \
  1587. {1, {{I2C_MUX_PCA9544, 0x72, 1}}}, \
  1588. {1, {{I2C_MUX_PCA9544, 0x72, 2}}}, \
  1589. }
  1590. which defines
  1591. bus 0 on adapter 0 without a mux
  1592. bus 1 on adapter 0 with a PCA9547 on address 0x70 port 1
  1593. bus 2 on adapter 0 with a PCA9547 on address 0x70 port 2
  1594. bus 3 on adapter 0 with a PCA9547 on address 0x70 port 3
  1595. bus 4 on adapter 0 with a PCA9547 on address 0x70 port 4
  1596. bus 5 on adapter 0 with a PCA9547 on address 0x70 port 5
  1597. bus 6 on adapter 1 without a mux
  1598. bus 7 on adapter 1 with a PCA9544 on address 0x72 port 1
  1599. bus 8 on adapter 1 with a PCA9544 on address 0x72 port 2
  1600. If you do not have i2c muxes on your board, omit this define.
  1601. - Legacy I2C Support: CONFIG_HARD_I2C
  1602. NOTE: It is intended to move drivers to CONFIG_SYS_I2C which
  1603. provides the following compelling advantages:
  1604. - more than one i2c adapter is usable
  1605. - approved multibus support
  1606. - better i2c mux support
  1607. ** Please consider updating your I2C driver now. **
  1608. These enable legacy I2C serial bus commands. Defining
  1609. CONFIG_HARD_I2C will include the appropriate I2C driver
  1610. for the selected CPU.
  1611. This will allow you to use i2c commands at the u-boot
  1612. command line (as long as you set CONFIG_CMD_I2C in
  1613. CONFIG_COMMANDS) and communicate with i2c based realtime
  1614. clock chips. See common/cmd_i2c.c for a description of the
  1615. command line interface.
  1616. CONFIG_HARD_I2C selects a hardware I2C controller.
  1617. There are several other quantities that must also be
  1618. defined when you define CONFIG_HARD_I2C.
  1619. In both cases you will need to define CONFIG_SYS_I2C_SPEED
  1620. to be the frequency (in Hz) at which you wish your i2c bus
  1621. to run and CONFIG_SYS_I2C_SLAVE to be the address of this node (ie
  1622. the CPU's i2c node address).
  1623. Now, the u-boot i2c code for the mpc8xx
  1624. (arch/powerpc/cpu/mpc8xx/i2c.c) sets the CPU up as a master node
  1625. and so its address should therefore be cleared to 0 (See,
  1626. eg, MPC823e User's Manual p.16-473). So, set
  1627. CONFIG_SYS_I2C_SLAVE to 0.
  1628. CONFIG_SYS_I2C_INIT_MPC5XXX
  1629. When a board is reset during an i2c bus transfer
  1630. chips might think that the current transfer is still
  1631. in progress. Reset the slave devices by sending start
  1632. commands until the slave device responds.
  1633. That's all that's required for CONFIG_HARD_I2C.
  1634. If you use the software i2c interface (CONFIG_SYS_I2C_SOFT)
  1635. then the following macros need to be defined (examples are
  1636. from include/configs/lwmon.h):
  1637. I2C_INIT
  1638. (Optional). Any commands necessary to enable the I2C
  1639. controller or configure ports.
  1640. eg: #define I2C_INIT (immr->im_cpm.cp_pbdir |= PB_SCL)
  1641. I2C_PORT
  1642. (Only for MPC8260 CPU). The I/O port to use (the code
  1643. assumes both bits are on the same port). Valid values
  1644. are 0..3 for ports A..D.
  1645. I2C_ACTIVE
  1646. The code necessary to make the I2C data line active
  1647. (driven). If the data line is open collector, this
  1648. define can be null.
  1649. eg: #define I2C_ACTIVE (immr->im_cpm.cp_pbdir |= PB_SDA)
  1650. I2C_TRISTATE
  1651. The code necessary to make the I2C data line tri-stated
  1652. (inactive). If the data line is open collector, this
  1653. define can be null.
  1654. eg: #define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA)
  1655. I2C_READ
  1656. Code that returns true if the I2C data line is high,
  1657. false if it is low.
  1658. eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0)
  1659. I2C_SDA(bit)
  1660. If <bit> is true, sets the I2C data line high. If it
  1661. is false, it clears it (low).
  1662. eg: #define I2C_SDA(bit) \
  1663. if(bit) immr->im_cpm.cp_pbdat |= PB_SDA; \
  1664. else immr->im_cpm.cp_pbdat &= ~PB_SDA
  1665. I2C_SCL(bit)
  1666. If <bit> is true, sets the I2C clock line high. If it
  1667. is false, it clears it (low).
  1668. eg: #define I2C_SCL(bit) \
  1669. if(bit) immr->im_cpm.cp_pbdat |= PB_SCL; \
  1670. else immr->im_cpm.cp_pbdat &= ~PB_SCL
  1671. I2C_DELAY
  1672. This delay is invoked four times per clock cycle so this
  1673. controls the rate of data transfer. The data rate thus
  1674. is 1 / (I2C_DELAY * 4). Often defined to be something
  1675. like:
  1676. #define I2C_DELAY udelay(2)
  1677. CONFIG_SOFT_I2C_GPIO_SCL / CONFIG_SOFT_I2C_GPIO_SDA
  1678. If your arch supports the generic GPIO framework (asm/gpio.h),
  1679. then you may alternatively define the two GPIOs that are to be
  1680. used as SCL / SDA. Any of the previous I2C_xxx macros will
  1681. have GPIO-based defaults assigned to them as appropriate.
  1682. You should define these to the GPIO value as given directly to
  1683. the generic GPIO functions.
  1684. CONFIG_SYS_I2C_INIT_BOARD
  1685. When a board is reset during an i2c bus transfer
  1686. chips might think that the current transfer is still
  1687. in progress. On some boards it is possible to access
  1688. the i2c SCLK line directly, either by using the
  1689. processor pin as a GPIO or by having a second pin
  1690. connected to the bus. If this option is defined a
  1691. custom i2c_init_board() routine in boards/xxx/board.c
  1692. is run early in the boot sequence.
  1693. CONFIG_SYS_I2C_BOARD_LATE_INIT
  1694. An alternative to CONFIG_SYS_I2C_INIT_BOARD. If this option is
  1695. defined a custom i2c_board_late_init() routine in
  1696. boards/xxx/board.c is run AFTER the operations in i2c_init()
  1697. is completed. This callpoint can be used to unreset i2c bus
  1698. using CPU i2c controller register accesses for CPUs whose i2c
  1699. controller provide such a method. It is called at the end of
  1700. i2c_init() to allow i2c_init operations to setup the i2c bus
  1701. controller on the CPU (e.g. setting bus speed & slave address).
  1702. CONFIG_I2CFAST (PPC405GP|PPC405EP only)
  1703. This option enables configuration of bi_iic_fast[] flags
  1704. in u-boot bd_info structure based on u-boot environment
  1705. variable "i2cfast". (see also i2cfast)
  1706. CONFIG_I2C_MULTI_BUS
  1707. This option allows the use of multiple I2C buses, each of which
  1708. must have a controller. At any point in time, only one bus is
  1709. active. To switch to a different bus, use the 'i2c dev' command.
  1710. Note that bus numbering is zero-based.
  1711. CONFIG_SYS_I2C_NOPROBES
  1712. This option specifies a list of I2C devices that will be skipped
  1713. when the 'i2c probe' command is issued. If CONFIG_I2C_MULTI_BUS
  1714. is set, specify a list of bus-device pairs. Otherwise, specify
  1715. a 1D array of device addresses
  1716. e.g.
  1717. #undef CONFIG_I2C_MULTI_BUS
  1718. #define CONFIG_SYS_I2C_NOPROBES {0x50,0x68}
  1719. will skip addresses 0x50 and 0x68 on a board with one I2C bus
  1720. #define CONFIG_I2C_MULTI_BUS
  1721. #define CONFIG_SYS_I2C_MULTI_NOPROBES {{0,0x50},{0,0x68},{1,0x54}}
  1722. will skip addresses 0x50 and 0x68 on bus 0 and address 0x54 on bus 1
  1723. CONFIG_SYS_SPD_BUS_NUM
  1724. If defined, then this indicates the I2C bus number for DDR SPD.
  1725. If not defined, then U-Boot assumes that SPD is on I2C bus 0.
  1726. CONFIG_SYS_RTC_BUS_NUM
  1727. If defined, then this indicates the I2C bus number for the RTC.
  1728. If not defined, then U-Boot assumes that RTC is on I2C bus 0.
  1729. CONFIG_SYS_DTT_BUS_NUM
  1730. If defined, then this indicates the I2C bus number for the DTT.
  1731. If not defined, then U-Boot assumes that DTT is on I2C bus 0.
  1732. CONFIG_SYS_I2C_DTT_ADDR:
  1733. If defined, specifies the I2C address of the DTT device.
  1734. If not defined, then U-Boot uses predefined value for
  1735. specified DTT device.
  1736. CONFIG_SOFT_I2C_READ_REPEATED_START
  1737. defining this will force the i2c_read() function in
  1738. the soft_i2c driver to perform an I2C repeated start
  1739. between writing the address pointer and reading the
  1740. data. If this define is omitted the default behaviour
  1741. of doing a stop-start sequence will be used. Most I2C
  1742. devices can use either method, but some require one or
  1743. the other.
  1744. - SPI Support: CONFIG_SPI
  1745. Enables SPI driver (so far only tested with
  1746. SPI EEPROM, also an instance works with Crystal A/D and
  1747. D/As on the SACSng board)
  1748. CONFIG_SH_SPI
  1749. Enables the driver for SPI controller on SuperH. Currently
  1750. only SH7757 is supported.
  1751. CONFIG_SPI_X
  1752. Enables extended (16-bit) SPI EEPROM addressing.
  1753. (symmetrical to CONFIG_I2C_X)
  1754. CONFIG_SOFT_SPI
  1755. Enables a software (bit-bang) SPI driver rather than
  1756. using hardware support. This is a general purpose
  1757. driver that only requires three general I/O port pins
  1758. (two outputs, one input) to function. If this is
  1759. defined, the board configuration must define several
  1760. SPI configuration items (port pins to use, etc). For
  1761. an example, see include/configs/sacsng.h.
  1762. CONFIG_HARD_SPI
  1763. Enables a hardware SPI driver for general-purpose reads
  1764. and writes. As with CONFIG_SOFT_SPI, the board configuration
  1765. must define a list of chip-select function pointers.
  1766. Currently supported on some MPC8xxx processors. For an
  1767. example, see include/configs/mpc8349emds.h.
  1768. CONFIG_MXC_SPI
  1769. Enables the driver for the SPI controllers on i.MX and MXC
  1770. SoCs. Currently i.MX31/35/51 are supported.
  1771. - FPGA Support: CONFIG_FPGA
  1772. Enables FPGA subsystem.
  1773. CONFIG_FPGA_<vendor>
  1774. Enables support for specific chip vendors.
  1775. (ALTERA, XILINX)
  1776. CONFIG_FPGA_<family>
  1777. Enables support for FPGA family.
  1778. (SPARTAN2, SPARTAN3, VIRTEX2, CYCLONE2, ACEX1K, ACEX)
  1779. CONFIG_FPGA_COUNT
  1780. Specify the number of FPGA devices to support.
  1781. CONFIG_SYS_FPGA_PROG_FEEDBACK
  1782. Enable printing of hash marks during FPGA configuration.
  1783. CONFIG_SYS_FPGA_CHECK_BUSY
  1784. Enable checks on FPGA configuration interface busy
  1785. status by the configuration function. This option
  1786. will require a board or device specific function to
  1787. be written.
  1788. CONFIG_FPGA_DELAY
  1789. If defined, a function that provides delays in the FPGA
  1790. configuration driver.
  1791. CONFIG_SYS_FPGA_CHECK_CTRLC
  1792. Allow Control-C to interrupt FPGA configuration
  1793. CONFIG_SYS_FPGA_CHECK_ERROR
  1794. Check for configuration errors during FPGA bitfile
  1795. loading. For example, abort during Virtex II
  1796. configuration if the INIT_B line goes low (which
  1797. indicated a CRC error).
  1798. CONFIG_SYS_FPGA_WAIT_INIT
  1799. Maximum time to wait for the INIT_B line to deassert
  1800. after PROB_B has been deasserted during a Virtex II
  1801. FPGA configuration sequence. The default time is 500
  1802. ms.
  1803. CONFIG_SYS_FPGA_WAIT_BUSY
  1804. Maximum time to wait for BUSY to deassert during
  1805. Virtex II FPGA configuration. The default is 5 ms.
  1806. CONFIG_SYS_FPGA_WAIT_CONFIG
  1807. Time to wait after FPGA configuration. The default is
  1808. 200 ms.
  1809. - Configuration Management:
  1810. CONFIG_IDENT_STRING
  1811. If defined, this string will be added to the U-Boot
  1812. version information (U_BOOT_VERSION)
  1813. - Vendor Parameter Protection:
  1814. U-Boot considers the values of the environment
  1815. variables "serial#" (Board Serial Number) and
  1816. "ethaddr" (Ethernet Address) to be parameters that
  1817. are set once by the board vendor / manufacturer, and
  1818. protects these variables from casual modification by
  1819. the user. Once set, these variables are read-only,
  1820. and write or delete attempts are rejected. You can
  1821. change this behaviour:
  1822. If CONFIG_ENV_OVERWRITE is #defined in your config
  1823. file, the write protection for vendor parameters is
  1824. completely disabled. Anybody can change or delete
  1825. these parameters.
  1826. Alternatively, if you #define _both_ CONFIG_ETHADDR
  1827. _and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default
  1828. Ethernet address is installed in the environment,
  1829. which can be changed exactly ONCE by the user. [The
  1830. serial# is unaffected by this, i. e. it remains
  1831. read-only.]
  1832. The same can be accomplished in a more flexible way
  1833. for any variable by configuring the type of access
  1834. to allow for those variables in the ".flags" variable
  1835. or define CONFIG_ENV_FLAGS_LIST_STATIC.
  1836. - Protected RAM:
  1837. CONFIG_PRAM
  1838. Define this variable to enable the reservation of
  1839. "protected RAM", i. e. RAM which is not overwritten
  1840. by U-Boot. Define CONFIG_PRAM to hold the number of
  1841. kB you want to reserve for pRAM. You can overwrite
  1842. this default value by defining an environment
  1843. variable "pram" to the number of kB you want to
  1844. reserve. Note that the board info structure will
  1845. still show the full amount of RAM. If pRAM is
  1846. reserved, a new environment variable "mem" will
  1847. automatically be defined to hold the amount of
  1848. remaining RAM in a form that can be passed as boot
  1849. argument to Linux, for instance like that:
  1850. setenv bootargs ... mem=\${mem}
  1851. saveenv
  1852. This way you can tell Linux not to use this memory,
  1853. either, which results in a memory region that will
  1854. not be affected by reboots.
  1855. *WARNING* If your board configuration uses automatic
  1856. detection of the RAM size, you must make sure that
  1857. this memory test is non-destructive. So far, the
  1858. following board configurations are known to be
  1859. "pRAM-clean":
  1860. IVMS8, IVML24, SPD8xx, TQM8xxL,
  1861. HERMES, IP860, RPXlite, LWMON,
  1862. FLAGADM, TQM8260
  1863. - Access to physical memory region (> 4GB)
  1864. Some basic support is provided for operations on memory not
  1865. normally accessible to U-Boot - e.g. some architectures
  1866. support access to more than 4GB of memory on 32-bit
  1867. machines using physical address extension or similar.
  1868. Define CONFIG_PHYSMEM to access this basic support, which
  1869. currently only supports clearing the memory.
  1870. - Error Recovery:
  1871. CONFIG_PANIC_HANG
  1872. Define this variable to stop the system in case of a
  1873. fatal error, so that you have to reset it manually.
  1874. This is probably NOT a good idea for an embedded
  1875. system where you want the system to reboot
  1876. automatically as fast as possible, but it may be
  1877. useful during development since you can try to debug
  1878. the conditions that lead to the situation.
  1879. CONFIG_NET_RETRY_COUNT
  1880. This variable defines the number of retries for
  1881. network operations like ARP, RARP, TFTP, or BOOTP
  1882. before giving up the operation. If not defined, a
  1883. default value of 5 is used.
  1884. CONFIG_ARP_TIMEOUT
  1885. Timeout waiting for an ARP reply in milliseconds.
  1886. CONFIG_NFS_TIMEOUT
  1887. Timeout in milliseconds used in NFS protocol.
  1888. If you encounter "ERROR: Cannot umount" in nfs command,
  1889. try longer timeout such as
  1890. #define CONFIG_NFS_TIMEOUT 10000UL
  1891. - Command Interpreter:
  1892. CONFIG_AUTO_COMPLETE
  1893. Enable auto completion of commands using TAB.
  1894. Note that this feature has NOT been implemented yet
  1895. for the "hush" shell.
  1896. CONFIG_SYS_HUSH_PARSER
  1897. Define this variable to enable the "hush" shell (from
  1898. Busybox) as command line interpreter, thus enabling
  1899. powerful command line syntax like
  1900. if...then...else...fi conditionals or `&&' and '||'
  1901. constructs ("shell scripts").
  1902. If undefined, you get the old, much simpler behaviour
  1903. with a somewhat smaller memory footprint.
  1904. CONFIG_SYS_PROMPT_HUSH_PS2
  1905. This defines the secondary prompt string, which is
  1906. printed when the command interpreter needs more input
  1907. to complete a command. Usually "> ".
  1908. Note:
  1909. In the current implementation, the local variables
  1910. space and global environment variables space are
  1911. separated. Local variables are those you define by
  1912. simply typing `name=value'. To access a local
  1913. variable later on, you have write `$name' or
  1914. `${name}'; to execute the contents of a variable
  1915. directly type `$name' at the command prompt.
  1916. Global environment variables are those you use
  1917. setenv/printenv to work with. To run a command stored
  1918. in such a variable, you need to use the run command,
  1919. and you must not use the '$' sign to access them.
  1920. To store commands and special characters in a
  1921. variable, please use double quotation marks
  1922. surrounding the whole text of the variable, instead
  1923. of the backslashes before semicolons and special
  1924. symbols.
  1925. - Commandline Editing and History:
  1926. CONFIG_CMDLINE_EDITING
  1927. Enable editing and History functions for interactive
  1928. commandline input operations
  1929. - Default Environment:
  1930. CONFIG_EXTRA_ENV_SETTINGS
  1931. Define this to contain any number of null terminated
  1932. strings (variable = value pairs) that will be part of
  1933. the default environment compiled into the boot image.
  1934. For example, place something like this in your
  1935. board's config file:
  1936. #define CONFIG_EXTRA_ENV_SETTINGS \
  1937. "myvar1=value1\0" \
  1938. "myvar2=value2\0"
  1939. Warning: This method is based on knowledge about the
  1940. internal format how the environment is stored by the
  1941. U-Boot code. This is NOT an official, exported
  1942. interface! Although it is unlikely that this format
  1943. will change soon, there is no guarantee either.
  1944. You better know what you are doing here.
  1945. Note: overly (ab)use of the default environment is
  1946. discouraged. Make sure to check other ways to preset
  1947. the environment like the "source" command or the
  1948. boot command first.
  1949. CONFIG_ENV_VARS_UBOOT_CONFIG
  1950. Define this in order to add variables describing the
  1951. U-Boot build configuration to the default environment.
  1952. These will be named arch, cpu, board, vendor, and soc.
  1953. Enabling this option will cause the following to be defined:
  1954. - CONFIG_SYS_ARCH
  1955. - CONFIG_SYS_CPU
  1956. - CONFIG_SYS_BOARD
  1957. - CONFIG_SYS_VENDOR
  1958. - CONFIG_SYS_SOC
  1959. CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
  1960. Define this in order to add variables describing certain
  1961. run-time determined information about the hardware to the
  1962. environment. These will be named board_name, board_rev.
  1963. CONFIG_DELAY_ENVIRONMENT
  1964. Normally the environment is loaded when the board is
  1965. intialised so that it is available to U-Boot. This inhibits
  1966. that so that the environment is not available until
  1967. explicitly loaded later by U-Boot code. With CONFIG_OF_CONTROL
  1968. this is instead controlled by the value of
  1969. /config/load-environment.
  1970. - DataFlash Support:
  1971. CONFIG_HAS_DATAFLASH
  1972. Defining this option enables DataFlash features and
  1973. allows to read/write in Dataflash via the standard
  1974. commands cp, md...
  1975. - Serial Flash support
  1976. CONFIG_CMD_SF
  1977. Defining this option enables SPI flash commands
  1978. 'sf probe/read/write/erase/update'.
  1979. Usage requires an initial 'probe' to define the serial
  1980. flash parameters, followed by read/write/erase/update
  1981. commands.
  1982. The following defaults may be provided by the platform
  1983. to handle the common case when only a single serial
  1984. flash is present on the system.
  1985. CONFIG_SF_DEFAULT_BUS Bus identifier
  1986. CONFIG_SF_DEFAULT_CS Chip-select
  1987. CONFIG_SF_DEFAULT_MODE (see include/spi.h)
  1988. CONFIG_SF_DEFAULT_SPEED in Hz
  1989. CONFIG_CMD_SF_TEST
  1990. Define this option to include a destructive SPI flash
  1991. test ('sf test').
  1992. CONFIG_SPI_FLASH_BAR Ban/Extended Addr Reg
  1993. Define this option to use the Bank addr/Extended addr
  1994. support on SPI flashes which has size > 16Mbytes.
  1995. - SystemACE Support:
  1996. CONFIG_SYSTEMACE
  1997. Adding this option adds support for Xilinx SystemACE
  1998. chips attached via some sort of local bus. The address
  1999. of the chip must also be defined in the
  2000. CONFIG_SYS_SYSTEMACE_BASE macro. For example:
  2001. #define CONFIG_SYSTEMACE
  2002. #define CONFIG_SYS_SYSTEMACE_BASE 0xf0000000
  2003. When SystemACE support is added, the "ace" device type
  2004. becomes available to the fat commands, i.e. fatls.
  2005. - TFTP Fixed UDP Port:
  2006. CONFIG_TFTP_PORT
  2007. If this is defined, the environment variable tftpsrcp
  2008. is used to supply the TFTP UDP source port value.
  2009. If tftpsrcp isn't defined, the normal pseudo-random port
  2010. number generator is used.
  2011. Also, the environment variable tftpdstp is used to supply
  2012. the TFTP UDP destination port value. If tftpdstp isn't
  2013. defined, the normal port 69 is used.
  2014. The purpose for tftpsrcp is to allow a TFTP server to
  2015. blindly start the TFTP transfer using the pre-configured
  2016. target IP address and UDP port. This has the effect of
  2017. "punching through" the (Windows XP) firewall, allowing
  2018. the remainder of the TFTP transfer to proceed normally.
  2019. A better solution is to properly configure the firewall,
  2020. but sometimes that is not allowed.
  2021. - Hashing support:
  2022. CONFIG_CMD_HASH
  2023. This enables a generic 'hash' command which can produce
  2024. hashes / digests from a few algorithms (e.g. SHA1, SHA256).
  2025. CONFIG_HASH_VERIFY
  2026. Enable the hash verify command (hash -v). This adds to code
  2027. size a little.
  2028. CONFIG_SHA1 - support SHA1 hashing
  2029. CONFIG_SHA256 - support SHA256 hashing
  2030. Note: There is also a sha1sum command, which should perhaps
  2031. be deprecated in favour of 'hash sha1'.
  2032. - Freescale i.MX specific commands:
  2033. CONFIG_CMD_HDMIDETECT
  2034. This enables 'hdmidet' command which returns true if an
  2035. HDMI monitor is detected. This command is i.MX 6 specific.
  2036. CONFIG_CMD_BMODE
  2037. This enables the 'bmode' (bootmode) command for forcing
  2038. a boot from specific media.
  2039. This is useful for forcing the ROM's usb downloader to
  2040. activate upon a watchdog reset which is nice when iterating
  2041. on U-Boot. Using the reset button or running bmode normal
  2042. will set it back to normal. This command currently
  2043. supports i.MX53 and i.MX6.
  2044. - Signing support:
  2045. CONFIG_RSA
  2046. This enables the RSA algorithm used for FIT image verification
  2047. in U-Boot. See doc/uImage/signature for more information.
  2048. The signing part is build into mkimage regardless of this
  2049. option.
  2050. - Show boot progress:
  2051. CONFIG_SHOW_BOOT_PROGRESS
  2052. Defining this option allows to add some board-
  2053. specific code (calling a user-provided function
  2054. "show_boot_progress(int)") that enables you to show
  2055. the system's boot progress on some display (for
  2056. example, some LED's) on your board. At the moment,
  2057. the following checkpoints are implemented:
  2058. - Detailed boot stage timing
  2059. CONFIG_BOOTSTAGE
  2060. Define this option to get detailed timing of each stage
  2061. of the boot process.
  2062. CONFIG_BOOTSTAGE_USER_COUNT
  2063. This is the number of available user bootstage records.
  2064. Each time you call bootstage_mark(BOOTSTAGE_ID_ALLOC, ...)
  2065. a new ID will be allocated from this stash. If you exceed
  2066. the limit, recording will stop.
  2067. CONFIG_BOOTSTAGE_REPORT
  2068. Define this to print a report before boot, similar to this:
  2069. Timer summary in microseconds:
  2070. Mark Elapsed Stage
  2071. 0 0 reset
  2072. 3,575,678 3,575,678 board_init_f start
  2073. 3,575,695 17 arch_cpu_init A9
  2074. 3,575,777 82 arch_cpu_init done
  2075. 3,659,598 83,821 board_init_r start
  2076. 3,910,375 250,777 main_loop
  2077. 29,916,167 26,005,792 bootm_start
  2078. 30,361,327 445,160 start_kernel
  2079. CONFIG_CMD_BOOTSTAGE
  2080. Add a 'bootstage' command which supports printing a report
  2081. and un/stashing of bootstage data.
  2082. CONFIG_BOOTSTAGE_FDT
  2083. Stash the bootstage information in the FDT. A root 'bootstage'
  2084. node is created with each bootstage id as a child. Each child
  2085. has a 'name' property and either 'mark' containing the
  2086. mark time in microsecond, or 'accum' containing the
  2087. accumulated time for that bootstage id in microseconds.
  2088. For example:
  2089. bootstage {
  2090. 154 {
  2091. name = "board_init_f";
  2092. mark = <3575678>;
  2093. };
  2094. 170 {
  2095. name = "lcd";
  2096. accum = <33482>;
  2097. };
  2098. };
  2099. Code in the Linux kernel can find this in /proc/devicetree.
  2100. Legacy uImage format:
  2101. Arg Where When
  2102. 1 common/cmd_bootm.c before attempting to boot an image
  2103. -1 common/cmd_bootm.c Image header has bad magic number
  2104. 2 common/cmd_bootm.c Image header has correct magic number
  2105. -2 common/cmd_bootm.c Image header has bad checksum
  2106. 3 common/cmd_bootm.c Image header has correct checksum
  2107. -3 common/cmd_bootm.c Image data has bad checksum
  2108. 4 common/cmd_bootm.c Image data has correct checksum
  2109. -4 common/cmd_bootm.c Image is for unsupported architecture
  2110. 5 common/cmd_bootm.c Architecture check OK
  2111. -5 common/cmd_bootm.c Wrong Image Type (not kernel, multi)
  2112. 6 common/cmd_bootm.c Image Type check OK
  2113. -6 common/cmd_bootm.c gunzip uncompression error
  2114. -7 common/cmd_bootm.c Unimplemented compression type
  2115. 7 common/cmd_bootm.c Uncompression OK
  2116. 8 common/cmd_bootm.c No uncompress/copy overwrite error
  2117. -9 common/cmd_bootm.c Unsupported OS (not Linux, BSD, VxWorks, QNX)
  2118. 9 common/image.c Start initial ramdisk verification
  2119. -10 common/image.c Ramdisk header has bad magic number
  2120. -11 common/image.c Ramdisk header has bad checksum
  2121. 10 common/image.c Ramdisk header is OK
  2122. -12 common/image.c Ramdisk data has bad checksum
  2123. 11 common/image.c Ramdisk data has correct checksum
  2124. 12 common/image.c Ramdisk verification complete, start loading
  2125. -13 common/image.c Wrong Image Type (not PPC Linux ramdisk)
  2126. 13 common/image.c Start multifile image verification
  2127. 14 common/image.c No initial ramdisk, no multifile, continue.
  2128. 15 arch/<arch>/lib/bootm.c All preparation done, transferring control to OS
  2129. -30 arch/powerpc/lib/board.c Fatal error, hang the system
  2130. -31 post/post.c POST test failed, detected by post_output_backlog()
  2131. -32 post/post.c POST test failed, detected by post_run_single()
  2132. 34 common/cmd_doc.c before loading a Image from a DOC device
  2133. -35 common/cmd_doc.c Bad usage of "doc" command
  2134. 35 common/cmd_doc.c correct usage of "doc" command
  2135. -36 common/cmd_doc.c No boot device
  2136. 36 common/cmd_doc.c correct boot device
  2137. -37 common/cmd_doc.c Unknown Chip ID on boot device
  2138. 37 common/cmd_doc.c correct chip ID found, device available
  2139. -38 common/cmd_doc.c Read Error on boot device
  2140. 38 common/cmd_doc.c reading Image header from DOC device OK
  2141. -39 common/cmd_doc.c Image header has bad magic number
  2142. 39 common/cmd_doc.c Image header has correct magic number
  2143. -40 common/cmd_doc.c Error reading Image from DOC device
  2144. 40 common/cmd_doc.c Image header has correct magic number
  2145. 41 common/cmd_ide.c before loading a Image from a IDE device
  2146. -42 common/cmd_ide.c Bad usage of "ide" command
  2147. 42 common/cmd_ide.c correct usage of "ide" command
  2148. -43 common/cmd_ide.c No boot device
  2149. 43 common/cmd_ide.c boot device found
  2150. -44 common/cmd_ide.c Device not available
  2151. 44 common/cmd_ide.c Device available
  2152. -45 common/cmd_ide.c wrong partition selected
  2153. 45 common/cmd_ide.c partition selected
  2154. -46 common/cmd_ide.c Unknown partition table
  2155. 46 common/cmd_ide.c valid partition table found
  2156. -47 common/cmd_ide.c Invalid partition type
  2157. 47 common/cmd_ide.c correct partition type
  2158. -48 common/cmd_ide.c Error reading Image Header on boot device
  2159. 48 common/cmd_ide.c reading Image Header from IDE device OK
  2160. -49 common/cmd_ide.c Image header has bad magic number
  2161. 49 common/cmd_ide.c Image header has correct magic number
  2162. -50 common/cmd_ide.c Image header has bad checksum
  2163. 50 common/cmd_ide.c Image header has correct checksum
  2164. -51 common/cmd_ide.c Error reading Image from IDE device
  2165. 51 common/cmd_ide.c reading Image from IDE device OK
  2166. 52 common/cmd_nand.c before loading a Image from a NAND device
  2167. -53 common/cmd_nand.c Bad usage of "nand" command
  2168. 53 common/cmd_nand.c correct usage of "nand" command
  2169. -54 common/cmd_nand.c No boot device
  2170. 54 common/cmd_nand.c boot device found
  2171. -55 common/cmd_nand.c Unknown Chip ID on boot device
  2172. 55 common/cmd_nand.c correct chip ID found, device available
  2173. -56 common/cmd_nand.c Error reading Image Header on boot device
  2174. 56 common/cmd_nand.c reading Image Header from NAND device OK
  2175. -57 common/cmd_nand.c Image header has bad magic number
  2176. 57 common/cmd_nand.c Image header has correct magic number
  2177. -58 common/cmd_nand.c Error reading Image from NAND device
  2178. 58 common/cmd_nand.c reading Image from NAND device OK
  2179. -60 common/env_common.c Environment has a bad CRC, using default
  2180. 64 net/eth.c starting with Ethernet configuration.
  2181. -64 net/eth.c no Ethernet found.
  2182. 65 net/eth.c Ethernet found.
  2183. -80 common/cmd_net.c usage wrong
  2184. 80 common/cmd_net.c before calling NetLoop()
  2185. -81 common/cmd_net.c some error in NetLoop() occurred
  2186. 81 common/cmd_net.c NetLoop() back without error
  2187. -82 common/cmd_net.c size == 0 (File with size 0 loaded)
  2188. 82 common/cmd_net.c trying automatic boot
  2189. 83 common/cmd_net.c running "source" command
  2190. -83 common/cmd_net.c some error in automatic boot or "source" command
  2191. 84 common/cmd_net.c end without errors
  2192. FIT uImage format:
  2193. Arg Where When
  2194. 100 common/cmd_bootm.c Kernel FIT Image has correct format
  2195. -100 common/cmd_bootm.c Kernel FIT Image has incorrect format
  2196. 101 common/cmd_bootm.c No Kernel subimage unit name, using configuration
  2197. -101 common/cmd_bootm.c Can't get configuration for kernel subimage
  2198. 102 common/cmd_bootm.c Kernel unit name specified
  2199. -103 common/cmd_bootm.c Can't get kernel subimage node offset
  2200. 103 common/cmd_bootm.c Found configuration node
  2201. 104 common/cmd_bootm.c Got kernel subimage node offset
  2202. -104 common/cmd_bootm.c Kernel subimage hash verification failed
  2203. 105 common/cmd_bootm.c Kernel subimage hash verification OK
  2204. -105 common/cmd_bootm.c Kernel subimage is for unsupported architecture
  2205. 106 common/cmd_bootm.c Architecture check OK
  2206. -106 common/cmd_bootm.c Kernel subimage has wrong type
  2207. 107 common/cmd_bootm.c Kernel subimage type OK
  2208. -107 common/cmd_bootm.c Can't get kernel subimage data/size
  2209. 108 common/cmd_bootm.c Got kernel subimage data/size
  2210. -108 common/cmd_bootm.c Wrong image type (not legacy, FIT)
  2211. -109 common/cmd_bootm.c Can't get kernel subimage type
  2212. -110 common/cmd_bootm.c Can't get kernel subimage comp
  2213. -111 common/cmd_bootm.c Can't get kernel subimage os
  2214. -112 common/cmd_bootm.c Can't get kernel subimage load address
  2215. -113 common/cmd_bootm.c Image uncompress/copy overwrite error
  2216. 120 common/image.c Start initial ramdisk verification
  2217. -120 common/image.c Ramdisk FIT image has incorrect format
  2218. 121 common/image.c Ramdisk FIT image has correct format
  2219. 122 common/image.c No ramdisk subimage unit name, using configuration
  2220. -122 common/image.c Can't get configuration for ramdisk subimage
  2221. 123 common/image.c Ramdisk unit name specified
  2222. -124 common/image.c Can't get ramdisk subimage node offset
  2223. 125 common/image.c Got ramdisk subimage node offset
  2224. -125 common/image.c Ramdisk subimage hash verification failed
  2225. 126 common/image.c Ramdisk subimage hash verification OK
  2226. -126 common/image.c Ramdisk subimage for unsupported architecture
  2227. 127 common/image.c Architecture check OK
  2228. -127 common/image.c Can't get ramdisk subimage data/size
  2229. 128 common/image.c Got ramdisk subimage data/size
  2230. 129 common/image.c Can't get ramdisk load address
  2231. -129 common/image.c Got ramdisk load address
  2232. -130 common/cmd_doc.c Incorrect FIT image format
  2233. 131 common/cmd_doc.c FIT image format OK
  2234. -140 common/cmd_ide.c Incorrect FIT image format
  2235. 141 common/cmd_ide.c FIT image format OK
  2236. -150 common/cmd_nand.c Incorrect FIT image format
  2237. 151 common/cmd_nand.c FIT image format OK
  2238. - FIT image support:
  2239. CONFIG_FIT
  2240. Enable support for the FIT uImage format.
  2241. CONFIG_FIT_BEST_MATCH
  2242. When no configuration is explicitly selected, default to the
  2243. one whose fdt's compatibility field best matches that of
  2244. U-Boot itself. A match is considered "best" if it matches the
  2245. most specific compatibility entry of U-Boot's fdt's root node.
  2246. The order of entries in the configuration's fdt is ignored.
  2247. CONFIG_FIT_SIGNATURE
  2248. This option enables signature verification of FIT uImages,
  2249. using a hash signed and verified using RSA. See
  2250. doc/uImage.FIT/signature.txt for more details.
  2251. - Standalone program support:
  2252. CONFIG_STANDALONE_LOAD_ADDR
  2253. This option defines a board specific value for the
  2254. address where standalone program gets loaded, thus
  2255. overwriting the architecture dependent default
  2256. settings.
  2257. - Frame Buffer Address:
  2258. CONFIG_FB_ADDR
  2259. Define CONFIG_FB_ADDR if you want to use specific
  2260. address for frame buffer. This is typically the case
  2261. when using a graphics controller has separate video
  2262. memory. U-Boot will then place the frame buffer at
  2263. the given address instead of dynamically reserving it
  2264. in system RAM by calling lcd_setmem(), which grabs
  2265. the memory for the frame buffer depending on the
  2266. configured panel size.
  2267. Please see board_init_f function.
  2268. - Automatic software updates via TFTP server
  2269. CONFIG_UPDATE_TFTP
  2270. CONFIG_UPDATE_TFTP_CNT_MAX
  2271. CONFIG_UPDATE_TFTP_MSEC_MAX
  2272. These options enable and control the auto-update feature;
  2273. for a more detailed description refer to doc/README.update.
  2274. - MTD Support (mtdparts command, UBI support)
  2275. CONFIG_MTD_DEVICE
  2276. Adds the MTD device infrastructure from the Linux kernel.
  2277. Needed for mtdparts command support.
  2278. CONFIG_MTD_PARTITIONS
  2279. Adds the MTD partitioning infrastructure from the Linux
  2280. kernel. Needed for UBI support.
  2281. - UBI support
  2282. CONFIG_CMD_UBI
  2283. Adds commands for interacting with MTD partitions formatted
  2284. with the UBI flash translation layer
  2285. Requires also defining CONFIG_RBTREE
  2286. CONFIG_UBI_SILENCE_MSG
  2287. Make the verbose messages from UBI stop printing. This leaves
  2288. warnings and errors enabled.
  2289. - UBIFS support
  2290. CONFIG_CMD_UBIFS
  2291. Adds commands for interacting with UBI volumes formatted as
  2292. UBIFS. UBIFS is read-only in u-boot.
  2293. Requires UBI support as well as CONFIG_LZO
  2294. CONFIG_UBIFS_SILENCE_MSG
  2295. Make the verbose messages from UBIFS stop printing. This leaves
  2296. warnings and errors enabled.
  2297. - SPL framework
  2298. CONFIG_SPL
  2299. Enable building of SPL globally.
  2300. CONFIG_SPL_LDSCRIPT
  2301. LDSCRIPT for linking the SPL binary.
  2302. CONFIG_SPL_MAX_FOOTPRINT
  2303. Maximum size in memory allocated to the SPL, BSS included.
  2304. When defined, the linker checks that the actual memory
  2305. used by SPL from _start to __bss_end does not exceed it.
  2306. CONFIG_SPL_MAX_FOOTPRINT and CONFIG_SPL_BSS_MAX_SIZE
  2307. must not be both defined at the same time.
  2308. CONFIG_SPL_MAX_SIZE
  2309. Maximum size of the SPL image (text, data, rodata, and
  2310. linker lists sections), BSS excluded.
  2311. When defined, the linker checks that the actual size does
  2312. not exceed it.
  2313. CONFIG_SPL_TEXT_BASE
  2314. TEXT_BASE for linking the SPL binary.
  2315. CONFIG_SPL_RELOC_TEXT_BASE
  2316. Address to relocate to. If unspecified, this is equal to
  2317. CONFIG_SPL_TEXT_BASE (i.e. no relocation is done).
  2318. CONFIG_SPL_BSS_START_ADDR
  2319. Link address for the BSS within the SPL binary.
  2320. CONFIG_SPL_BSS_MAX_SIZE
  2321. Maximum size in memory allocated to the SPL BSS.
  2322. When defined, the linker checks that the actual memory used
  2323. by SPL from __bss_start to __bss_end does not exceed it.
  2324. CONFIG_SPL_MAX_FOOTPRINT and CONFIG_SPL_BSS_MAX_SIZE
  2325. must not be both defined at the same time.
  2326. CONFIG_SPL_STACK
  2327. Adress of the start of the stack SPL will use
  2328. CONFIG_SPL_RELOC_STACK
  2329. Adress of the start of the stack SPL will use after
  2330. relocation. If unspecified, this is equal to
  2331. CONFIG_SPL_STACK.
  2332. CONFIG_SYS_SPL_MALLOC_START
  2333. Starting address of the malloc pool used in SPL.
  2334. CONFIG_SYS_SPL_MALLOC_SIZE
  2335. The size of the malloc pool used in SPL.
  2336. CONFIG_SPL_FRAMEWORK
  2337. Enable the SPL framework under common/. This framework
  2338. supports MMC, NAND and YMODEM loading of U-Boot and NAND
  2339. NAND loading of the Linux Kernel.
  2340. CONFIG_SPL_DISPLAY_PRINT
  2341. For ARM, enable an optional function to print more information
  2342. about the running system.
  2343. CONFIG_SPL_INIT_MINIMAL
  2344. Arch init code should be built for a very small image
  2345. CONFIG_SPL_LIBCOMMON_SUPPORT
  2346. Support for common/libcommon.o in SPL binary
  2347. CONFIG_SPL_LIBDISK_SUPPORT
  2348. Support for disk/libdisk.o in SPL binary
  2349. CONFIG_SPL_I2C_SUPPORT
  2350. Support for drivers/i2c/libi2c.o in SPL binary
  2351. CONFIG_SPL_GPIO_SUPPORT
  2352. Support for drivers/gpio/libgpio.o in SPL binary
  2353. CONFIG_SPL_MMC_SUPPORT
  2354. Support for drivers/mmc/libmmc.o in SPL binary
  2355. CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR,
  2356. CONFIG_SYS_U_BOOT_MAX_SIZE_SECTORS,
  2357. CONFIG_SYS_MMC_SD_FAT_BOOT_PARTITION
  2358. Address, size and partition on the MMC to load U-Boot from
  2359. when the MMC is being used in raw mode.
  2360. CONFIG_SYS_MMCSD_RAW_MODE_KERNEL_SECTOR
  2361. Sector to load kernel uImage from when MMC is being
  2362. used in raw mode (for Falcon mode)
  2363. CONFIG_SYS_MMCSD_RAW_MODE_ARGS_SECTOR,
  2364. CONFIG_SYS_MMCSD_RAW_MODE_ARGS_SECTORS
  2365. Sector and number of sectors to load kernel argument
  2366. parameters from when MMC is being used in raw mode
  2367. (for falcon mode)
  2368. CONFIG_SPL_FAT_SUPPORT
  2369. Support for fs/fat/libfat.o in SPL binary
  2370. CONFIG_SPL_FAT_LOAD_PAYLOAD_NAME
  2371. Filename to read to load U-Boot when reading from FAT
  2372. CONFIG_SPL_FAT_LOAD_KERNEL_NAME
  2373. Filename to read to load kernel uImage when reading
  2374. from FAT (for Falcon mode)
  2375. CONFIG_SPL_FAT_LOAD_ARGS_NAME
  2376. Filename to read to load kernel argument parameters
  2377. when reading from FAT (for Falcon mode)
  2378. CONFIG_SPL_MPC83XX_WAIT_FOR_NAND
  2379. Set this for NAND SPL on PPC mpc83xx targets, so that
  2380. start.S waits for the rest of the SPL to load before
  2381. continuing (the hardware starts execution after just
  2382. loading the first page rather than the full 4K).
  2383. CONFIG_SPL_NAND_BASE
  2384. Include nand_base.c in the SPL. Requires
  2385. CONFIG_SPL_NAND_DRIVERS.
  2386. CONFIG_SPL_NAND_DRIVERS
  2387. SPL uses normal NAND drivers, not minimal drivers.
  2388. CONFIG_SPL_NAND_ECC
  2389. Include standard software ECC in the SPL
  2390. CONFIG_SPL_NAND_SIMPLE
  2391. Support for NAND boot using simple NAND drivers that
  2392. expose the cmd_ctrl() interface.
  2393. CONFIG_SPL_MPC8XXX_INIT_DDR_SUPPORT
  2394. Set for the SPL on PPC mpc8xxx targets, support for
  2395. arch/powerpc/cpu/mpc8xxx/ddr/libddr.o in SPL binary.
  2396. CONFIG_SPL_COMMON_INIT_DDR
  2397. Set for common ddr init with serial presence detect in
  2398. SPL binary.
  2399. CONFIG_SYS_NAND_5_ADDR_CYCLE, CONFIG_SYS_NAND_PAGE_COUNT,
  2400. CONFIG_SYS_NAND_PAGE_SIZE, CONFIG_SYS_NAND_OOBSIZE,
  2401. CONFIG_SYS_NAND_BLOCK_SIZE, CONFIG_SYS_NAND_BAD_BLOCK_POS,
  2402. CONFIG_SYS_NAND_ECCPOS, CONFIG_SYS_NAND_ECCSIZE,
  2403. CONFIG_SYS_NAND_ECCBYTES
  2404. Defines the size and behavior of the NAND that SPL uses
  2405. to read U-Boot
  2406. CONFIG_SYS_NAND_U_BOOT_OFFS
  2407. Location in NAND to read U-Boot from
  2408. CONFIG_SYS_NAND_U_BOOT_DST
  2409. Location in memory to load U-Boot to
  2410. CONFIG_SYS_NAND_U_BOOT_SIZE
  2411. Size of image to load
  2412. CONFIG_SYS_NAND_U_BOOT_START
  2413. Entry point in loaded image to jump to
  2414. CONFIG_SYS_NAND_HW_ECC_OOBFIRST
  2415. Define this if you need to first read the OOB and then the
  2416. data. This is used for example on davinci plattforms.
  2417. CONFIG_SPL_OMAP3_ID_NAND
  2418. Support for an OMAP3-specific set of functions to return the
  2419. ID and MFR of the first attached NAND chip, if present.
  2420. CONFIG_SPL_SERIAL_SUPPORT
  2421. Support for drivers/serial/libserial.o in SPL binary
  2422. CONFIG_SPL_SPI_FLASH_SUPPORT
  2423. Support for drivers/mtd/spi/libspi_flash.o in SPL binary
  2424. CONFIG_SPL_SPI_SUPPORT
  2425. Support for drivers/spi/libspi.o in SPL binary
  2426. CONFIG_SPL_RAM_DEVICE
  2427. Support for running image already present in ram, in SPL binary
  2428. CONFIG_SPL_LIBGENERIC_SUPPORT
  2429. Support for lib/libgeneric.o in SPL binary
  2430. CONFIG_SPL_ENV_SUPPORT
  2431. Support for the environment operating in SPL binary
  2432. CONFIG_SPL_NET_SUPPORT
  2433. Support for the net/libnet.o in SPL binary.
  2434. It conflicts with SPL env from storage medium specified by
  2435. CONFIG_ENV_IS_xxx but CONFIG_ENV_IS_NOWHERE
  2436. CONFIG_SPL_PAD_TO
  2437. Image offset to which the SPL should be padded before appending
  2438. the SPL payload. By default, this is defined as
  2439. CONFIG_SPL_MAX_SIZE, or 0 if CONFIG_SPL_MAX_SIZE is undefined.
  2440. CONFIG_SPL_PAD_TO must be either 0, meaning to append the SPL
  2441. payload without any padding, or >= CONFIG_SPL_MAX_SIZE.
  2442. CONFIG_SPL_TARGET
  2443. Final target image containing SPL and payload. Some SPLs
  2444. use an arch-specific makefile fragment instead, for
  2445. example if more than one image needs to be produced.
  2446. CONFIG_FIT_SPL_PRINT
  2447. Printing information about a FIT image adds quite a bit of
  2448. code to SPL. So this is normally disabled in SPL. Use this
  2449. option to re-enable it. This will affect the output of the
  2450. bootm command when booting a FIT image.
  2451. - TPL framework
  2452. CONFIG_TPL
  2453. Enable building of TPL globally.
  2454. CONFIG_TPL_PAD_TO
  2455. Image offset to which the TPL should be padded before appending
  2456. the TPL payload. By default, this is defined as
  2457. CONFIG_SPL_MAX_SIZE, or 0 if CONFIG_SPL_MAX_SIZE is undefined.
  2458. CONFIG_SPL_PAD_TO must be either 0, meaning to append the SPL
  2459. payload without any padding, or >= CONFIG_SPL_MAX_SIZE.
  2460. Modem Support:
  2461. --------------
  2462. [so far only for SMDK2400 boards]
  2463. - Modem support enable:
  2464. CONFIG_MODEM_SUPPORT
  2465. - RTS/CTS Flow control enable:
  2466. CONFIG_HWFLOW
  2467. - Modem debug support:
  2468. CONFIG_MODEM_SUPPORT_DEBUG
  2469. Enables debugging stuff (char screen[1024], dbg())
  2470. for modem support. Useful only with BDI2000.
  2471. - Interrupt support (PPC):
  2472. There are common interrupt_init() and timer_interrupt()
  2473. for all PPC archs. interrupt_init() calls interrupt_init_cpu()
  2474. for CPU specific initialization. interrupt_init_cpu()
  2475. should set decrementer_count to appropriate value. If
  2476. CPU resets decrementer automatically after interrupt
  2477. (ppc4xx) it should set decrementer_count to zero.
  2478. timer_interrupt() calls timer_interrupt_cpu() for CPU
  2479. specific handling. If board has watchdog / status_led
  2480. / other_activity_monitor it works automatically from
  2481. general timer_interrupt().
  2482. - General:
  2483. In the target system modem support is enabled when a
  2484. specific key (key combination) is pressed during
  2485. power-on. Otherwise U-Boot will boot normally
  2486. (autoboot). The key_pressed() function is called from
  2487. board_init(). Currently key_pressed() is a dummy
  2488. function, returning 1 and thus enabling modem
  2489. initialization.
  2490. If there are no modem init strings in the
  2491. environment, U-Boot proceed to autoboot; the
  2492. previous output (banner, info printfs) will be
  2493. suppressed, though.
  2494. See also: doc/README.Modem
  2495. Board initialization settings:
  2496. ------------------------------
  2497. During Initialization u-boot calls a number of board specific functions
  2498. to allow the preparation of board specific prerequisites, e.g. pin setup
  2499. before drivers are initialized. To enable these callbacks the
  2500. following configuration macros have to be defined. Currently this is
  2501. architecture specific, so please check arch/your_architecture/lib/board.c
  2502. typically in board_init_f() and board_init_r().
  2503. - CONFIG_BOARD_EARLY_INIT_F: Call board_early_init_f()
  2504. - CONFIG_BOARD_EARLY_INIT_R: Call board_early_init_r()
  2505. - CONFIG_BOARD_LATE_INIT: Call board_late_init()
  2506. - CONFIG_BOARD_POSTCLK_INIT: Call board_postclk_init()
  2507. Configuration Settings:
  2508. -----------------------
  2509. - CONFIG_SYS_LONGHELP: Defined when you want long help messages included;
  2510. undefine this when you're short of memory.
  2511. - CONFIG_SYS_HELP_CMD_WIDTH: Defined when you want to override the default
  2512. width of the commands listed in the 'help' command output.
  2513. - CONFIG_SYS_PROMPT: This is what U-Boot prints on the console to
  2514. prompt for user input.
  2515. - CONFIG_SYS_CBSIZE: Buffer size for input from the Console
  2516. - CONFIG_SYS_PBSIZE: Buffer size for Console output
  2517. - CONFIG_SYS_MAXARGS: max. Number of arguments accepted for monitor commands
  2518. - CONFIG_SYS_BARGSIZE: Buffer size for Boot Arguments which are passed to
  2519. the application (usually a Linux kernel) when it is
  2520. booted
  2521. - CONFIG_SYS_BAUDRATE_TABLE:
  2522. List of legal baudrate settings for this board.
  2523. - CONFIG_SYS_CONSOLE_INFO_QUIET
  2524. Suppress display of console information at boot.
  2525. - CONFIG_SYS_CONSOLE_IS_IN_ENV
  2526. If the board specific function
  2527. extern int overwrite_console (void);
  2528. returns 1, the stdin, stderr and stdout are switched to the
  2529. serial port, else the settings in the environment are used.
  2530. - CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
  2531. Enable the call to overwrite_console().
  2532. - CONFIG_SYS_CONSOLE_ENV_OVERWRITE
  2533. Enable overwrite of previous console environment settings.
  2534. - CONFIG_SYS_MEMTEST_START, CONFIG_SYS_MEMTEST_END:
  2535. Begin and End addresses of the area used by the
  2536. simple memory test.
  2537. - CONFIG_SYS_ALT_MEMTEST:
  2538. Enable an alternate, more extensive memory test.
  2539. - CONFIG_SYS_MEMTEST_SCRATCH:
  2540. Scratch address used by the alternate memory test
  2541. You only need to set this if address zero isn't writeable
  2542. - CONFIG_SYS_MEM_TOP_HIDE (PPC only):
  2543. If CONFIG_SYS_MEM_TOP_HIDE is defined in the board config header,
  2544. this specified memory area will get subtracted from the top
  2545. (end) of RAM and won't get "touched" at all by U-Boot. By
  2546. fixing up gd->ram_size the Linux kernel should gets passed
  2547. the now "corrected" memory size and won't touch it either.
  2548. This should work for arch/ppc and arch/powerpc. Only Linux
  2549. board ports in arch/powerpc with bootwrapper support that
  2550. recalculate the memory size from the SDRAM controller setup
  2551. will have to get fixed in Linux additionally.
  2552. This option can be used as a workaround for the 440EPx/GRx
  2553. CHIP 11 errata where the last 256 bytes in SDRAM shouldn't
  2554. be touched.
  2555. WARNING: Please make sure that this value is a multiple of
  2556. the Linux page size (normally 4k). If this is not the case,
  2557. then the end address of the Linux memory will be located at a
  2558. non page size aligned address and this could cause major
  2559. problems.
  2560. - CONFIG_SYS_LOADS_BAUD_CHANGE:
  2561. Enable temporary baudrate change while serial download
  2562. - CONFIG_SYS_SDRAM_BASE:
  2563. Physical start address of SDRAM. _Must_ be 0 here.
  2564. - CONFIG_SYS_MBIO_BASE:
  2565. Physical start address of Motherboard I/O (if using a
  2566. Cogent motherboard)
  2567. - CONFIG_SYS_FLASH_BASE:
  2568. Physical start address of Flash memory.
  2569. - CONFIG_SYS_MONITOR_BASE:
  2570. Physical start address of boot monitor code (set by
  2571. make config files to be same as the text base address
  2572. (CONFIG_SYS_TEXT_BASE) used when linking) - same as
  2573. CONFIG_SYS_FLASH_BASE when booting from flash.
  2574. - CONFIG_SYS_MONITOR_LEN:
  2575. Size of memory reserved for monitor code, used to
  2576. determine _at_compile_time_ (!) if the environment is
  2577. embedded within the U-Boot image, or in a separate
  2578. flash sector.
  2579. - CONFIG_SYS_MALLOC_LEN:
  2580. Size of DRAM reserved for malloc() use.
  2581. - CONFIG_SYS_BOOTM_LEN:
  2582. Normally compressed uImages are limited to an
  2583. uncompressed size of 8 MBytes. If this is not enough,
  2584. you can define CONFIG_SYS_BOOTM_LEN in your board config file
  2585. to adjust this setting to your needs.
  2586. - CONFIG_SYS_BOOTMAPSZ:
  2587. Maximum size of memory mapped by the startup code of
  2588. the Linux kernel; all data that must be processed by
  2589. the Linux kernel (bd_info, boot arguments, FDT blob if
  2590. used) must be put below this limit, unless "bootm_low"
  2591. environment variable is defined and non-zero. In such case
  2592. all data for the Linux kernel must be between "bootm_low"
  2593. and "bootm_low" + CONFIG_SYS_BOOTMAPSZ. The environment
  2594. variable "bootm_mapsize" will override the value of
  2595. CONFIG_SYS_BOOTMAPSZ. If CONFIG_SYS_BOOTMAPSZ is undefined,
  2596. then the value in "bootm_size" will be used instead.
  2597. - CONFIG_SYS_BOOT_RAMDISK_HIGH:
  2598. Enable initrd_high functionality. If defined then the
  2599. initrd_high feature is enabled and the bootm ramdisk subcommand
  2600. is enabled.
  2601. - CONFIG_SYS_BOOT_GET_CMDLINE:
  2602. Enables allocating and saving kernel cmdline in space between
  2603. "bootm_low" and "bootm_low" + BOOTMAPSZ.
  2604. - CONFIG_SYS_BOOT_GET_KBD:
  2605. Enables allocating and saving a kernel copy of the bd_info in
  2606. space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
  2607. - CONFIG_SYS_MAX_FLASH_BANKS:
  2608. Max number of Flash memory banks
  2609. - CONFIG_SYS_MAX_FLASH_SECT:
  2610. Max number of sectors on a Flash chip
  2611. - CONFIG_SYS_FLASH_ERASE_TOUT:
  2612. Timeout for Flash erase operations (in ms)
  2613. - CONFIG_SYS_FLASH_WRITE_TOUT:
  2614. Timeout for Flash write operations (in ms)
  2615. - CONFIG_SYS_FLASH_LOCK_TOUT
  2616. Timeout for Flash set sector lock bit operation (in ms)
  2617. - CONFIG_SYS_FLASH_UNLOCK_TOUT
  2618. Timeout for Flash clear lock bits operation (in ms)
  2619. - CONFIG_SYS_FLASH_PROTECTION
  2620. If defined, hardware flash sectors protection is used
  2621. instead of U-Boot software protection.
  2622. - CONFIG_SYS_DIRECT_FLASH_TFTP:
  2623. Enable TFTP transfers directly to flash memory;
  2624. without this option such a download has to be
  2625. performed in two steps: (1) download to RAM, and (2)
  2626. copy from RAM to flash.
  2627. The two-step approach is usually more reliable, since
  2628. you can check if the download worked before you erase
  2629. the flash, but in some situations (when system RAM is
  2630. too limited to allow for a temporary copy of the
  2631. downloaded image) this option may be very useful.
  2632. - CONFIG_SYS_FLASH_CFI:
  2633. Define if the flash driver uses extra elements in the
  2634. common flash structure for storing flash geometry.
  2635. - CONFIG_FLASH_CFI_DRIVER
  2636. This option also enables the building of the cfi_flash driver
  2637. in the drivers directory
  2638. - CONFIG_FLASH_CFI_MTD
  2639. This option enables the building of the cfi_mtd driver
  2640. in the drivers directory. The driver exports CFI flash
  2641. to the MTD layer.
  2642. - CONFIG_SYS_FLASH_USE_BUFFER_WRITE
  2643. Use buffered writes to flash.
  2644. - CONFIG_FLASH_SPANSION_S29WS_N
  2645. s29ws-n MirrorBit flash has non-standard addresses for buffered
  2646. write commands.
  2647. - CONFIG_SYS_FLASH_QUIET_TEST
  2648. If this option is defined, the common CFI flash doesn't
  2649. print it's warning upon not recognized FLASH banks. This
  2650. is useful, if some of the configured banks are only
  2651. optionally available.
  2652. - CONFIG_FLASH_SHOW_PROGRESS
  2653. If defined (must be an integer), print out countdown
  2654. digits and dots. Recommended value: 45 (9..1) for 80
  2655. column displays, 15 (3..1) for 40 column displays.
  2656. - CONFIG_FLASH_VERIFY
  2657. If defined, the content of the flash (destination) is compared
  2658. against the source after the write operation. An error message
  2659. will be printed when the contents are not identical.
  2660. Please note that this option is useless in nearly all cases,
  2661. since such flash programming errors usually are detected earlier
  2662. while unprotecting/erasing/programming. Please only enable
  2663. this option if you really know what you are doing.
  2664. - CONFIG_SYS_RX_ETH_BUFFER:
  2665. Defines the number of Ethernet receive buffers. On some
  2666. Ethernet controllers it is recommended to set this value
  2667. to 8 or even higher (EEPRO100 or 405 EMAC), since all
  2668. buffers can be full shortly after enabling the interface
  2669. on high Ethernet traffic.
  2670. Defaults to 4 if not defined.
  2671. - CONFIG_ENV_MAX_ENTRIES
  2672. Maximum number of entries in the hash table that is used
  2673. internally to store the environment settings. The default
  2674. setting is supposed to be generous and should work in most
  2675. cases. This setting can be used to tune behaviour; see
  2676. lib/hashtable.c for details.
  2677. - CONFIG_ENV_FLAGS_LIST_DEFAULT
  2678. - CONFIG_ENV_FLAGS_LIST_STATIC
  2679. Enable validation of the values given to environment variables when
  2680. calling env set. Variables can be restricted to only decimal,
  2681. hexadecimal, or boolean. If CONFIG_CMD_NET is also defined,
  2682. the variables can also be restricted to IP address or MAC address.
  2683. The format of the list is:
  2684. type_attribute = [s|d|x|b|i|m]
  2685. access_atribute = [a|r|o|c]
  2686. attributes = type_attribute[access_atribute]
  2687. entry = variable_name[:attributes]
  2688. list = entry[,list]
  2689. The type attributes are:
  2690. s - String (default)
  2691. d - Decimal
  2692. x - Hexadecimal
  2693. b - Boolean ([1yYtT|0nNfF])
  2694. i - IP address
  2695. m - MAC address
  2696. The access attributes are:
  2697. a - Any (default)
  2698. r - Read-only
  2699. o - Write-once
  2700. c - Change-default
  2701. - CONFIG_ENV_FLAGS_LIST_DEFAULT
  2702. Define this to a list (string) to define the ".flags"
  2703. envirnoment variable in the default or embedded environment.
  2704. - CONFIG_ENV_FLAGS_LIST_STATIC
  2705. Define this to a list (string) to define validation that
  2706. should be done if an entry is not found in the ".flags"
  2707. environment variable. To override a setting in the static
  2708. list, simply add an entry for the same variable name to the
  2709. ".flags" variable.
  2710. - CONFIG_ENV_ACCESS_IGNORE_FORCE
  2711. If defined, don't allow the -f switch to env set override variable
  2712. access flags.
  2713. - CONFIG_SYS_GENERIC_BOARD
  2714. This selects the architecture-generic board system instead of the
  2715. architecture-specific board files. It is intended to move boards
  2716. to this new framework over time. Defining this will disable the
  2717. arch/foo/lib/board.c file and use common/board_f.c and
  2718. common/board_r.c instead. To use this option your architecture
  2719. must support it (i.e. must define __HAVE_ARCH_GENERIC_BOARD in
  2720. its config.mk file). If you find problems enabling this option on
  2721. your board please report the problem and send patches!
  2722. - CONFIG_SYS_SYM_OFFSETS
  2723. This is set by architectures that use offsets for link symbols
  2724. instead of absolute values. So bss_start is obtained using an
  2725. offset _bss_start_ofs from CONFIG_SYS_TEXT_BASE, rather than
  2726. directly. You should not need to touch this setting.
  2727. - CONFIG_OMAP_PLATFORM_RESET_TIME_MAX_USEC (OMAP only)
  2728. This is set by OMAP boards for the max time that reset should
  2729. be asserted. See doc/README.omap-reset-time for details on how
  2730. the value can be calulated on a given board.
  2731. The following definitions that deal with the placement and management
  2732. of environment data (variable area); in general, we support the
  2733. following configurations:
  2734. - CONFIG_BUILD_ENVCRC:
  2735. Builds up envcrc with the target environment so that external utils
  2736. may easily extract it and embed it in final U-Boot images.
  2737. - CONFIG_ENV_IS_IN_FLASH:
  2738. Define this if the environment is in flash memory.
  2739. a) The environment occupies one whole flash sector, which is
  2740. "embedded" in the text segment with the U-Boot code. This
  2741. happens usually with "bottom boot sector" or "top boot
  2742. sector" type flash chips, which have several smaller
  2743. sectors at the start or the end. For instance, such a
  2744. layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In
  2745. such a case you would place the environment in one of the
  2746. 4 kB sectors - with U-Boot code before and after it. With
  2747. "top boot sector" type flash chips, you would put the
  2748. environment in one of the last sectors, leaving a gap
  2749. between U-Boot and the environment.
  2750. - CONFIG_ENV_OFFSET:
  2751. Offset of environment data (variable area) to the
  2752. beginning of flash memory; for instance, with bottom boot
  2753. type flash chips the second sector can be used: the offset
  2754. for this sector is given here.
  2755. CONFIG_ENV_OFFSET is used relative to CONFIG_SYS_FLASH_BASE.
  2756. - CONFIG_ENV_ADDR:
  2757. This is just another way to specify the start address of
  2758. the flash sector containing the environment (instead of
  2759. CONFIG_ENV_OFFSET).
  2760. - CONFIG_ENV_SECT_SIZE:
  2761. Size of the sector containing the environment.
  2762. b) Sometimes flash chips have few, equal sized, BIG sectors.
  2763. In such a case you don't want to spend a whole sector for
  2764. the environment.
  2765. - CONFIG_ENV_SIZE:
  2766. If you use this in combination with CONFIG_ENV_IS_IN_FLASH
  2767. and CONFIG_ENV_SECT_SIZE, you can specify to use only a part
  2768. of this flash sector for the environment. This saves
  2769. memory for the RAM copy of the environment.
  2770. It may also save flash memory if you decide to use this
  2771. when your environment is "embedded" within U-Boot code,
  2772. since then the remainder of the flash sector could be used
  2773. for U-Boot code. It should be pointed out that this is
  2774. STRONGLY DISCOURAGED from a robustness point of view:
  2775. updating the environment in flash makes it always
  2776. necessary to erase the WHOLE sector. If something goes
  2777. wrong before the contents has been restored from a copy in
  2778. RAM, your target system will be dead.
  2779. - CONFIG_ENV_ADDR_REDUND
  2780. CONFIG_ENV_SIZE_REDUND
  2781. These settings describe a second storage area used to hold
  2782. a redundant copy of the environment data, so that there is
  2783. a valid backup copy in case there is a power failure during
  2784. a "saveenv" operation.
  2785. BE CAREFUL! Any changes to the flash layout, and some changes to the
  2786. source code will make it necessary to adapt <board>/u-boot.lds*
  2787. accordingly!
  2788. - CONFIG_ENV_IS_IN_NVRAM:
  2789. Define this if you have some non-volatile memory device
  2790. (NVRAM, battery buffered SRAM) which you want to use for the
  2791. environment.
  2792. - CONFIG_ENV_ADDR:
  2793. - CONFIG_ENV_SIZE:
  2794. These two #defines are used to determine the memory area you
  2795. want to use for environment. It is assumed that this memory
  2796. can just be read and written to, without any special
  2797. provision.
  2798. BE CAREFUL! The first access to the environment happens quite early
  2799. in U-Boot initalization (when we try to get the setting of for the
  2800. console baudrate). You *MUST* have mapped your NVRAM area then, or
  2801. U-Boot will hang.
  2802. Please note that even with NVRAM we still use a copy of the
  2803. environment in RAM: we could work on NVRAM directly, but we want to
  2804. keep settings there always unmodified except somebody uses "saveenv"
  2805. to save the current settings.
  2806. - CONFIG_ENV_IS_IN_EEPROM:
  2807. Use this if you have an EEPROM or similar serial access
  2808. device and a driver for it.
  2809. - CONFIG_ENV_OFFSET:
  2810. - CONFIG_ENV_SIZE:
  2811. These two #defines specify the offset and size of the
  2812. environment area within the total memory of your EEPROM.
  2813. - CONFIG_SYS_I2C_EEPROM_ADDR:
  2814. If defined, specified the chip address of the EEPROM device.
  2815. The default address is zero.
  2816. - CONFIG_SYS_EEPROM_PAGE_WRITE_BITS:
  2817. If defined, the number of bits used to address bytes in a
  2818. single page in the EEPROM device. A 64 byte page, for example
  2819. would require six bits.
  2820. - CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS:
  2821. If defined, the number of milliseconds to delay between
  2822. page writes. The default is zero milliseconds.
  2823. - CONFIG_SYS_I2C_EEPROM_ADDR_LEN:
  2824. The length in bytes of the EEPROM memory array address. Note
  2825. that this is NOT the chip address length!
  2826. - CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW:
  2827. EEPROM chips that implement "address overflow" are ones
  2828. like Catalyst 24WC04/08/16 which has 9/10/11 bits of
  2829. address and the extra bits end up in the "chip address" bit
  2830. slots. This makes a 24WC08 (1Kbyte) chip look like four 256
  2831. byte chips.
  2832. Note that we consider the length of the address field to
  2833. still be one byte because the extra address bits are hidden
  2834. in the chip address.
  2835. - CONFIG_SYS_EEPROM_SIZE:
  2836. The size in bytes of the EEPROM device.
  2837. - CONFIG_ENV_EEPROM_IS_ON_I2C
  2838. define this, if you have I2C and SPI activated, and your
  2839. EEPROM, which holds the environment, is on the I2C bus.
  2840. - CONFIG_I2C_ENV_EEPROM_BUS
  2841. if you have an Environment on an EEPROM reached over
  2842. I2C muxes, you can define here, how to reach this
  2843. EEPROM. For example:
  2844. #define CONFIG_I2C_ENV_EEPROM_BUS 1
  2845. EEPROM which holds the environment, is reached over
  2846. a pca9547 i2c mux with address 0x70, channel 3.
  2847. - CONFIG_ENV_IS_IN_DATAFLASH:
  2848. Define this if you have a DataFlash memory device which you
  2849. want to use for the environment.
  2850. - CONFIG_ENV_OFFSET:
  2851. - CONFIG_ENV_ADDR:
  2852. - CONFIG_ENV_SIZE:
  2853. These three #defines specify the offset and size of the
  2854. environment area within the total memory of your DataFlash placed
  2855. at the specified address.
  2856. - CONFIG_ENV_IS_IN_REMOTE:
  2857. Define this if you have a remote memory space which you
  2858. want to use for the local device's environment.
  2859. - CONFIG_ENV_ADDR:
  2860. - CONFIG_ENV_SIZE:
  2861. These two #defines specify the address and size of the
  2862. environment area within the remote memory space. The
  2863. local device can get the environment from remote memory
  2864. space by SRIO or PCIE links.
  2865. BE CAREFUL! For some special cases, the local device can not use
  2866. "saveenv" command. For example, the local device will get the
  2867. environment stored in a remote NOR flash by SRIO or PCIE link,
  2868. but it can not erase, write this NOR flash by SRIO or PCIE interface.
  2869. - CONFIG_ENV_IS_IN_NAND:
  2870. Define this if you have a NAND device which you want to use
  2871. for the environment.
  2872. - CONFIG_ENV_OFFSET:
  2873. - CONFIG_ENV_SIZE:
  2874. These two #defines specify the offset and size of the environment
  2875. area within the first NAND device. CONFIG_ENV_OFFSET must be
  2876. aligned to an erase block boundary.
  2877. - CONFIG_ENV_OFFSET_REDUND (optional):
  2878. This setting describes a second storage area of CONFIG_ENV_SIZE
  2879. size used to hold a redundant copy of the environment data, so
  2880. that there is a valid backup copy in case there is a power failure
  2881. during a "saveenv" operation. CONFIG_ENV_OFFSET_RENDUND must be
  2882. aligned to an erase block boundary.
  2883. - CONFIG_ENV_RANGE (optional):
  2884. Specifies the length of the region in which the environment
  2885. can be written. This should be a multiple of the NAND device's
  2886. block size. Specifying a range with more erase blocks than
  2887. are needed to hold CONFIG_ENV_SIZE allows bad blocks within
  2888. the range to be avoided.
  2889. - CONFIG_ENV_OFFSET_OOB (optional):
  2890. Enables support for dynamically retrieving the offset of the
  2891. environment from block zero's out-of-band data. The
  2892. "nand env.oob" command can be used to record this offset.
  2893. Currently, CONFIG_ENV_OFFSET_REDUND is not supported when
  2894. using CONFIG_ENV_OFFSET_OOB.
  2895. - CONFIG_NAND_ENV_DST
  2896. Defines address in RAM to which the nand_spl code should copy the
  2897. environment. If redundant environment is used, it will be copied to
  2898. CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE.
  2899. - CONFIG_ENV_IS_IN_UBI:
  2900. Define this if you have an UBI volume that you want to use for the
  2901. environment. This has the benefit of wear-leveling the environment
  2902. accesses, which is important on NAND.
  2903. - CONFIG_ENV_UBI_PART:
  2904. Define this to a string that is the mtd partition containing the UBI.
  2905. - CONFIG_ENV_UBI_VOLUME:
  2906. Define this to the name of the volume that you want to store the
  2907. environment in.
  2908. - CONFIG_ENV_UBI_VOLUME_REDUND:
  2909. Define this to the name of another volume to store a second copy of
  2910. the environment in. This will enable redundant environments in UBI.
  2911. It is assumed that both volumes are in the same MTD partition.
  2912. - CONFIG_UBI_SILENCE_MSG
  2913. - CONFIG_UBIFS_SILENCE_MSG
  2914. You will probably want to define these to avoid a really noisy system
  2915. when storing the env in UBI.
  2916. - CONFIG_ENV_IS_IN_MMC:
  2917. Define this if you have an MMC device which you want to use for the
  2918. environment.
  2919. - CONFIG_SYS_MMC_ENV_DEV:
  2920. Specifies which MMC device the environment is stored in.
  2921. - CONFIG_SYS_MMC_ENV_PART (optional):
  2922. Specifies which MMC partition the environment is stored in. If not
  2923. set, defaults to partition 0, the user area. Common values might be
  2924. 1 (first MMC boot partition), 2 (second MMC boot partition).
  2925. - CONFIG_ENV_OFFSET:
  2926. - CONFIG_ENV_SIZE:
  2927. These two #defines specify the offset and size of the environment
  2928. area within the specified MMC device.
  2929. If offset is positive (the usual case), it is treated as relative to
  2930. the start of the MMC partition. If offset is negative, it is treated
  2931. as relative to the end of the MMC partition. This can be useful if
  2932. your board may be fitted with different MMC devices, which have
  2933. different sizes for the MMC partitions, and you always want the
  2934. environment placed at the very end of the partition, to leave the
  2935. maximum possible space before it, to store other data.
  2936. These two values are in units of bytes, but must be aligned to an
  2937. MMC sector boundary.
  2938. - CONFIG_ENV_OFFSET_REDUND (optional):
  2939. Specifies a second storage area, of CONFIG_ENV_SIZE size, used to
  2940. hold a redundant copy of the environment data. This provides a
  2941. valid backup copy in case the other copy is corrupted, e.g. due
  2942. to a power failure during a "saveenv" operation.
  2943. This value may also be positive or negative; this is handled in the
  2944. same way as CONFIG_ENV_OFFSET.
  2945. This value is also in units of bytes, but must also be aligned to
  2946. an MMC sector boundary.
  2947. - CONFIG_ENV_SIZE_REDUND (optional):
  2948. This value need not be set, even when CONFIG_ENV_OFFSET_REDUND is
  2949. set. If this value is set, it must be set to the same value as
  2950. CONFIG_ENV_SIZE.
  2951. - CONFIG_SYS_SPI_INIT_OFFSET
  2952. Defines offset to the initial SPI buffer area in DPRAM. The
  2953. area is used at an early stage (ROM part) if the environment
  2954. is configured to reside in the SPI EEPROM: We need a 520 byte
  2955. scratch DPRAM area. It is used between the two initialization
  2956. calls (spi_init_f() and spi_init_r()). A value of 0xB00 seems
  2957. to be a good choice since it makes it far enough from the
  2958. start of the data area as well as from the stack pointer.
  2959. Please note that the environment is read-only until the monitor
  2960. has been relocated to RAM and a RAM copy of the environment has been
  2961. created; also, when using EEPROM you will have to use getenv_f()
  2962. until then to read environment variables.
  2963. The environment is protected by a CRC32 checksum. Before the monitor
  2964. is relocated into RAM, as a result of a bad CRC you will be working
  2965. with the compiled-in default environment - *silently*!!! [This is
  2966. necessary, because the first environment variable we need is the
  2967. "baudrate" setting for the console - if we have a bad CRC, we don't
  2968. have any device yet where we could complain.]
  2969. Note: once the monitor has been relocated, then it will complain if
  2970. the default environment is used; a new CRC is computed as soon as you
  2971. use the "saveenv" command to store a valid environment.
  2972. - CONFIG_SYS_FAULT_ECHO_LINK_DOWN:
  2973. Echo the inverted Ethernet link state to the fault LED.
  2974. Note: If this option is active, then CONFIG_SYS_FAULT_MII_ADDR
  2975. also needs to be defined.
  2976. - CONFIG_SYS_FAULT_MII_ADDR:
  2977. MII address of the PHY to check for the Ethernet link state.
  2978. - CONFIG_NS16550_MIN_FUNCTIONS:
  2979. Define this if you desire to only have use of the NS16550_init
  2980. and NS16550_putc functions for the serial driver located at
  2981. drivers/serial/ns16550.c. This option is useful for saving
  2982. space for already greatly restricted images, including but not
  2983. limited to NAND_SPL configurations.
  2984. - CONFIG_DISPLAY_BOARDINFO
  2985. Display information about the board that U-Boot is running on
  2986. when U-Boot starts up. The board function checkboard() is called
  2987. to do this.
  2988. - CONFIG_DISPLAY_BOARDINFO_LATE
  2989. Similar to the previous option, but display this information
  2990. later, once stdio is running and output goes to the LCD, if
  2991. present.
  2992. Low Level (hardware related) configuration options:
  2993. ---------------------------------------------------
  2994. - CONFIG_SYS_CACHELINE_SIZE:
  2995. Cache Line Size of the CPU.
  2996. - CONFIG_SYS_DEFAULT_IMMR:
  2997. Default address of the IMMR after system reset.
  2998. Needed on some 8260 systems (MPC8260ADS, PQ2FADS-ZU,
  2999. and RPXsuper) to be able to adjust the position of
  3000. the IMMR register after a reset.
  3001. - CONFIG_SYS_CCSRBAR_DEFAULT:
  3002. Default (power-on reset) physical address of CCSR on Freescale
  3003. PowerPC SOCs.
  3004. - CONFIG_SYS_CCSRBAR:
  3005. Virtual address of CCSR. On a 32-bit build, this is typically
  3006. the same value as CONFIG_SYS_CCSRBAR_DEFAULT.
  3007. CONFIG_SYS_DEFAULT_IMMR must also be set to this value,
  3008. for cross-platform code that uses that macro instead.
  3009. - CONFIG_SYS_CCSRBAR_PHYS:
  3010. Physical address of CCSR. CCSR can be relocated to a new
  3011. physical address, if desired. In this case, this macro should
  3012. be set to that address. Otherwise, it should be set to the
  3013. same value as CONFIG_SYS_CCSRBAR_DEFAULT. For example, CCSR
  3014. is typically relocated on 36-bit builds. It is recommended
  3015. that this macro be defined via the _HIGH and _LOW macros:
  3016. #define CONFIG_SYS_CCSRBAR_PHYS ((CONFIG_SYS_CCSRBAR_PHYS_HIGH
  3017. * 1ull) << 32 | CONFIG_SYS_CCSRBAR_PHYS_LOW)
  3018. - CONFIG_SYS_CCSRBAR_PHYS_HIGH:
  3019. Bits 33-36 of CONFIG_SYS_CCSRBAR_PHYS. This value is typically
  3020. either 0 (32-bit build) or 0xF (36-bit build). This macro is
  3021. used in assembly code, so it must not contain typecasts or
  3022. integer size suffixes (e.g. "ULL").
  3023. - CONFIG_SYS_CCSRBAR_PHYS_LOW:
  3024. Lower 32-bits of CONFIG_SYS_CCSRBAR_PHYS. This macro is
  3025. used in assembly code, so it must not contain typecasts or
  3026. integer size suffixes (e.g. "ULL").
  3027. - CONFIG_SYS_CCSR_DO_NOT_RELOCATE:
  3028. If this macro is defined, then CONFIG_SYS_CCSRBAR_PHYS will be
  3029. forced to a value that ensures that CCSR is not relocated.
  3030. - Floppy Disk Support:
  3031. CONFIG_SYS_FDC_DRIVE_NUMBER
  3032. the default drive number (default value 0)
  3033. CONFIG_SYS_ISA_IO_STRIDE
  3034. defines the spacing between FDC chipset registers
  3035. (default value 1)
  3036. CONFIG_SYS_ISA_IO_OFFSET
  3037. defines the offset of register from address. It
  3038. depends on which part of the data bus is connected to
  3039. the FDC chipset. (default value 0)
  3040. If CONFIG_SYS_ISA_IO_STRIDE CONFIG_SYS_ISA_IO_OFFSET and
  3041. CONFIG_SYS_FDC_DRIVE_NUMBER are undefined, they take their
  3042. default value.
  3043. if CONFIG_SYS_FDC_HW_INIT is defined, then the function
  3044. fdc_hw_init() is called at the beginning of the FDC
  3045. setup. fdc_hw_init() must be provided by the board
  3046. source code. It is used to make hardware dependant
  3047. initializations.
  3048. - CONFIG_IDE_AHB:
  3049. Most IDE controllers were designed to be connected with PCI
  3050. interface. Only few of them were designed for AHB interface.
  3051. When software is doing ATA command and data transfer to
  3052. IDE devices through IDE-AHB controller, some additional
  3053. registers accessing to these kind of IDE-AHB controller
  3054. is requierd.
  3055. - CONFIG_SYS_IMMR: Physical address of the Internal Memory.
  3056. DO NOT CHANGE unless you know exactly what you're
  3057. doing! (11-4) [MPC8xx/82xx systems only]
  3058. - CONFIG_SYS_INIT_RAM_ADDR:
  3059. Start address of memory area that can be used for
  3060. initial data and stack; please note that this must be
  3061. writable memory that is working WITHOUT special
  3062. initialization, i. e. you CANNOT use normal RAM which
  3063. will become available only after programming the
  3064. memory controller and running certain initialization
  3065. sequences.
  3066. U-Boot uses the following memory types:
  3067. - MPC8xx and MPC8260: IMMR (internal memory of the CPU)
  3068. - MPC824X: data cache
  3069. - PPC4xx: data cache
  3070. - CONFIG_SYS_GBL_DATA_OFFSET:
  3071. Offset of the initial data structure in the memory
  3072. area defined by CONFIG_SYS_INIT_RAM_ADDR. Usually
  3073. CONFIG_SYS_GBL_DATA_OFFSET is chosen such that the initial
  3074. data is located at the end of the available space
  3075. (sometimes written as (CONFIG_SYS_INIT_RAM_SIZE -
  3076. CONFIG_SYS_INIT_DATA_SIZE), and the initial stack is just
  3077. below that area (growing from (CONFIG_SYS_INIT_RAM_ADDR +
  3078. CONFIG_SYS_GBL_DATA_OFFSET) downward.
  3079. Note:
  3080. On the MPC824X (or other systems that use the data
  3081. cache for initial memory) the address chosen for
  3082. CONFIG_SYS_INIT_RAM_ADDR is basically arbitrary - it must
  3083. point to an otherwise UNUSED address space between
  3084. the top of RAM and the start of the PCI space.
  3085. - CONFIG_SYS_SIUMCR: SIU Module Configuration (11-6)
  3086. - CONFIG_SYS_SYPCR: System Protection Control (11-9)
  3087. - CONFIG_SYS_TBSCR: Time Base Status and Control (11-26)
  3088. - CONFIG_SYS_PISCR: Periodic Interrupt Status and Control (11-31)
  3089. - CONFIG_SYS_PLPRCR: PLL, Low-Power, and Reset Control Register (15-30)
  3090. - CONFIG_SYS_SCCR: System Clock and reset Control Register (15-27)
  3091. - CONFIG_SYS_OR_TIMING_SDRAM:
  3092. SDRAM timing
  3093. - CONFIG_SYS_MAMR_PTA:
  3094. periodic timer for refresh
  3095. - CONFIG_SYS_DER: Debug Event Register (37-47)
  3096. - FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CONFIG_SYS_REMAP_OR_AM,
  3097. CONFIG_SYS_PRELIM_OR_AM, CONFIG_SYS_OR_TIMING_FLASH, CONFIG_SYS_OR0_REMAP,
  3098. CONFIG_SYS_OR0_PRELIM, CONFIG_SYS_BR0_PRELIM, CONFIG_SYS_OR1_REMAP, CONFIG_SYS_OR1_PRELIM,
  3099. CONFIG_SYS_BR1_PRELIM:
  3100. Memory Controller Definitions: BR0/1 and OR0/1 (FLASH)
  3101. - SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE,
  3102. CONFIG_SYS_OR_TIMING_SDRAM, CONFIG_SYS_OR2_PRELIM, CONFIG_SYS_BR2_PRELIM,
  3103. CONFIG_SYS_OR3_PRELIM, CONFIG_SYS_BR3_PRELIM:
  3104. Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM)
  3105. - CONFIG_SYS_MAMR_PTA, CONFIG_SYS_MPTPR_2BK_4K, CONFIG_SYS_MPTPR_1BK_4K, CONFIG_SYS_MPTPR_2BK_8K,
  3106. CONFIG_SYS_MPTPR_1BK_8K, CONFIG_SYS_MAMR_8COL, CONFIG_SYS_MAMR_9COL:
  3107. Machine Mode Register and Memory Periodic Timer
  3108. Prescaler definitions (SDRAM timing)
  3109. - CONFIG_SYS_I2C_UCODE_PATCH, CONFIG_SYS_I2C_DPMEM_OFFSET [0x1FC0]:
  3110. enable I2C microcode relocation patch (MPC8xx);
  3111. define relocation offset in DPRAM [DSP2]
  3112. - CONFIG_SYS_SMC_UCODE_PATCH, CONFIG_SYS_SMC_DPMEM_OFFSET [0x1FC0]:
  3113. enable SMC microcode relocation patch (MPC8xx);
  3114. define relocation offset in DPRAM [SMC1]
  3115. - CONFIG_SYS_SPI_UCODE_PATCH, CONFIG_SYS_SPI_DPMEM_OFFSET [0x1FC0]:
  3116. enable SPI microcode relocation patch (MPC8xx);
  3117. define relocation offset in DPRAM [SCC4]
  3118. - CONFIG_SYS_USE_OSCCLK:
  3119. Use OSCM clock mode on MBX8xx board. Be careful,
  3120. wrong setting might damage your board. Read
  3121. doc/README.MBX before setting this variable!
  3122. - CONFIG_SYS_CPM_POST_WORD_ADDR: (MPC8xx, MPC8260 only)
  3123. Offset of the bootmode word in DPRAM used by post
  3124. (Power On Self Tests). This definition overrides
  3125. #define'd default value in commproc.h resp.
  3126. cpm_8260.h.
  3127. - CONFIG_SYS_PCI_SLV_MEM_LOCAL, CONFIG_SYS_PCI_SLV_MEM_BUS, CONFIG_SYS_PICMR0_MASK_ATTRIB,
  3128. CONFIG_SYS_PCI_MSTR0_LOCAL, CONFIG_SYS_PCIMSK0_MASK, CONFIG_SYS_PCI_MSTR1_LOCAL,
  3129. CONFIG_SYS_PCIMSK1_MASK, CONFIG_SYS_PCI_MSTR_MEM_LOCAL, CONFIG_SYS_PCI_MSTR_MEM_BUS,
  3130. CONFIG_SYS_CPU_PCI_MEM_START, CONFIG_SYS_PCI_MSTR_MEM_SIZE, CONFIG_SYS_POCMR0_MASK_ATTRIB,
  3131. CONFIG_SYS_PCI_MSTR_MEMIO_LOCAL, CONFIG_SYS_PCI_MSTR_MEMIO_BUS, CPU_PCI_MEMIO_START,
  3132. CONFIG_SYS_PCI_MSTR_MEMIO_SIZE, CONFIG_SYS_POCMR1_MASK_ATTRIB, CONFIG_SYS_PCI_MSTR_IO_LOCAL,
  3133. CONFIG_SYS_PCI_MSTR_IO_BUS, CONFIG_SYS_CPU_PCI_IO_START, CONFIG_SYS_PCI_MSTR_IO_SIZE,
  3134. CONFIG_SYS_POCMR2_MASK_ATTRIB: (MPC826x only)
  3135. Overrides the default PCI memory map in arch/powerpc/cpu/mpc8260/pci.c if set.
  3136. - CONFIG_PCI_DISABLE_PCIE:
  3137. Disable PCI-Express on systems where it is supported but not
  3138. required.
  3139. - CONFIG_PCI_ENUM_ONLY
  3140. Only scan through and get the devices on the busses.
  3141. Don't do any setup work, presumably because someone or
  3142. something has already done it, and we don't need to do it
  3143. a second time. Useful for platforms that are pre-booted
  3144. by coreboot or similar.
  3145. - CONFIG_PCI_INDIRECT_BRIDGE:
  3146. Enable support for indirect PCI bridges.
  3147. - CONFIG_SYS_SRIO:
  3148. Chip has SRIO or not
  3149. - CONFIG_SRIO1:
  3150. Board has SRIO 1 port available
  3151. - CONFIG_SRIO2:
  3152. Board has SRIO 2 port available
  3153. - CONFIG_SRIO_PCIE_BOOT_MASTER
  3154. Board can support master function for Boot from SRIO and PCIE
  3155. - CONFIG_SYS_SRIOn_MEM_VIRT:
  3156. Virtual Address of SRIO port 'n' memory region
  3157. - CONFIG_SYS_SRIOn_MEM_PHYS:
  3158. Physical Address of SRIO port 'n' memory region
  3159. - CONFIG_SYS_SRIOn_MEM_SIZE:
  3160. Size of SRIO port 'n' memory region
  3161. - CONFIG_SYS_NAND_BUSWIDTH_16BIT
  3162. Defined to tell the NAND controller that the NAND chip is using
  3163. a 16 bit bus.
  3164. Not all NAND drivers use this symbol.
  3165. Example of drivers that use it:
  3166. - drivers/mtd/nand/ndfc.c
  3167. - drivers/mtd/nand/mxc_nand.c
  3168. - CONFIG_SYS_NDFC_EBC0_CFG
  3169. Sets the EBC0_CFG register for the NDFC. If not defined
  3170. a default value will be used.
  3171. - CONFIG_SPD_EEPROM
  3172. Get DDR timing information from an I2C EEPROM. Common
  3173. with pluggable memory modules such as SODIMMs
  3174. SPD_EEPROM_ADDRESS
  3175. I2C address of the SPD EEPROM
  3176. - CONFIG_SYS_SPD_BUS_NUM
  3177. If SPD EEPROM is on an I2C bus other than the first
  3178. one, specify here. Note that the value must resolve
  3179. to something your driver can deal with.
  3180. - CONFIG_SYS_DDR_RAW_TIMING
  3181. Get DDR timing information from other than SPD. Common with
  3182. soldered DDR chips onboard without SPD. DDR raw timing
  3183. parameters are extracted from datasheet and hard-coded into
  3184. header files or board specific files.
  3185. - CONFIG_FSL_DDR_INTERACTIVE
  3186. Enable interactive DDR debugging. See doc/README.fsl-ddr.
  3187. - CONFIG_SYS_83XX_DDR_USES_CS0
  3188. Only for 83xx systems. If specified, then DDR should
  3189. be configured using CS0 and CS1 instead of CS2 and CS3.
  3190. - CONFIG_ETHER_ON_FEC[12]
  3191. Define to enable FEC[12] on a 8xx series processor.
  3192. - CONFIG_FEC[12]_PHY
  3193. Define to the hardcoded PHY address which corresponds
  3194. to the given FEC; i. e.
  3195. #define CONFIG_FEC1_PHY 4
  3196. means that the PHY with address 4 is connected to FEC1
  3197. When set to -1, means to probe for first available.
  3198. - CONFIG_FEC[12]_PHY_NORXERR
  3199. The PHY does not have a RXERR line (RMII only).
  3200. (so program the FEC to ignore it).
  3201. - CONFIG_RMII
  3202. Enable RMII mode for all FECs.
  3203. Note that this is a global option, we can't
  3204. have one FEC in standard MII mode and another in RMII mode.
  3205. - CONFIG_CRC32_VERIFY
  3206. Add a verify option to the crc32 command.
  3207. The syntax is:
  3208. => crc32 -v <address> <count> <crc32>
  3209. Where address/count indicate a memory area
  3210. and crc32 is the correct crc32 which the
  3211. area should have.
  3212. - CONFIG_LOOPW
  3213. Add the "loopw" memory command. This only takes effect if
  3214. the memory commands are activated globally (CONFIG_CMD_MEM).
  3215. - CONFIG_MX_CYCLIC
  3216. Add the "mdc" and "mwc" memory commands. These are cyclic
  3217. "md/mw" commands.
  3218. Examples:
  3219. => mdc.b 10 4 500
  3220. This command will print 4 bytes (10,11,12,13) each 500 ms.
  3221. => mwc.l 100 12345678 10
  3222. This command will write 12345678 to address 100 all 10 ms.
  3223. This only takes effect if the memory commands are activated
  3224. globally (CONFIG_CMD_MEM).
  3225. - CONFIG_SKIP_LOWLEVEL_INIT
  3226. [ARM, NDS32, MIPS only] If this variable is defined, then certain
  3227. low level initializations (like setting up the memory
  3228. controller) are omitted and/or U-Boot does not
  3229. relocate itself into RAM.
  3230. Normally this variable MUST NOT be defined. The only
  3231. exception is when U-Boot is loaded (to RAM) by some
  3232. other boot loader or by a debugger which performs
  3233. these initializations itself.
  3234. - CONFIG_SPL_BUILD
  3235. Modifies the behaviour of start.S when compiling a loader
  3236. that is executed before the actual U-Boot. E.g. when
  3237. compiling a NAND SPL.
  3238. - CONFIG_TPL_BUILD
  3239. Modifies the behaviour of start.S when compiling a loader
  3240. that is executed after the SPL and before the actual U-Boot.
  3241. It is loaded by the SPL.
  3242. - CONFIG_SYS_MPC85XX_NO_RESETVEC
  3243. Only for 85xx systems. If this variable is specified, the section
  3244. .resetvec is not kept and the section .bootpg is placed in the
  3245. previous 4k of the .text section.
  3246. - CONFIG_ARCH_MAP_SYSMEM
  3247. Generally U-Boot (and in particular the md command) uses
  3248. effective address. It is therefore not necessary to regard
  3249. U-Boot address as virtual addresses that need to be translated
  3250. to physical addresses. However, sandbox requires this, since
  3251. it maintains its own little RAM buffer which contains all
  3252. addressable memory. This option causes some memory accesses
  3253. to be mapped through map_sysmem() / unmap_sysmem().
  3254. - CONFIG_USE_ARCH_MEMCPY
  3255. CONFIG_USE_ARCH_MEMSET
  3256. If these options are used a optimized version of memcpy/memset will
  3257. be used if available. These functions may be faster under some
  3258. conditions but may increase the binary size.
  3259. - CONFIG_X86_RESET_VECTOR
  3260. If defined, the x86 reset vector code is included. This is not
  3261. needed when U-Boot is running from Coreboot.
  3262. - CONFIG_SYS_MPUCLK
  3263. Defines the MPU clock speed (in MHz).
  3264. NOTE : currently only supported on AM335x platforms.
  3265. Freescale QE/FMAN Firmware Support:
  3266. -----------------------------------
  3267. The Freescale QUICCEngine (QE) and Frame Manager (FMAN) both support the
  3268. loading of "firmware", which is encoded in the QE firmware binary format.
  3269. This firmware often needs to be loaded during U-Boot booting, so macros
  3270. are used to identify the storage device (NOR flash, SPI, etc) and the address
  3271. within that device.
  3272. - CONFIG_SYS_QE_FMAN_FW_ADDR
  3273. The address in the storage device where the firmware is located. The
  3274. meaning of this address depends on which CONFIG_SYS_QE_FW_IN_xxx macro
  3275. is also specified.
  3276. - CONFIG_SYS_QE_FMAN_FW_LENGTH
  3277. The maximum possible size of the firmware. The firmware binary format
  3278. has a field that specifies the actual size of the firmware, but it
  3279. might not be possible to read any part of the firmware unless some
  3280. local storage is allocated to hold the entire firmware first.
  3281. - CONFIG_SYS_QE_FMAN_FW_IN_NOR
  3282. Specifies that QE/FMAN firmware is located in NOR flash, mapped as
  3283. normal addressable memory via the LBC. CONFIG_SYS_FMAN_FW_ADDR is the
  3284. virtual address in NOR flash.
  3285. - CONFIG_SYS_QE_FMAN_FW_IN_NAND
  3286. Specifies that QE/FMAN firmware is located in NAND flash.
  3287. CONFIG_SYS_FMAN_FW_ADDR is the offset within NAND flash.
  3288. - CONFIG_SYS_QE_FMAN_FW_IN_MMC
  3289. Specifies that QE/FMAN firmware is located on the primary SD/MMC
  3290. device. CONFIG_SYS_FMAN_FW_ADDR is the byte offset on that device.
  3291. - CONFIG_SYS_QE_FMAN_FW_IN_SPIFLASH
  3292. Specifies that QE/FMAN firmware is located on the primary SPI
  3293. device. CONFIG_SYS_FMAN_FW_ADDR is the byte offset on that device.
  3294. - CONFIG_SYS_QE_FMAN_FW_IN_REMOTE
  3295. Specifies that QE/FMAN firmware is located in the remote (master)
  3296. memory space. CONFIG_SYS_FMAN_FW_ADDR is a virtual address which
  3297. can be mapped from slave TLB->slave LAW->slave SRIO or PCIE outbound
  3298. window->master inbound window->master LAW->the ucode address in
  3299. master's memory space.
  3300. Building the Software:
  3301. ======================
  3302. Building U-Boot has been tested in several native build environments
  3303. and in many different cross environments. Of course we cannot support
  3304. all possibly existing versions of cross development tools in all
  3305. (potentially obsolete) versions. In case of tool chain problems we
  3306. recommend to use the ELDK (see http://www.denx.de/wiki/DULG/ELDK)
  3307. which is extensively used to build and test U-Boot.
  3308. If you are not using a native environment, it is assumed that you
  3309. have GNU cross compiling tools available in your path. In this case,
  3310. you must set the environment variable CROSS_COMPILE in your shell.
  3311. Note that no changes to the Makefile or any other source files are
  3312. necessary. For example using the ELDK on a 4xx CPU, please enter:
  3313. $ CROSS_COMPILE=ppc_4xx-
  3314. $ export CROSS_COMPILE
  3315. Note: If you wish to generate Windows versions of the utilities in
  3316. the tools directory you can use the MinGW toolchain
  3317. (http://www.mingw.org). Set your HOST tools to the MinGW
  3318. toolchain and execute 'make tools'. For example:
  3319. $ make HOSTCC=i586-mingw32msvc-gcc HOSTSTRIP=i586-mingw32msvc-strip tools
  3320. Binaries such as tools/mkimage.exe will be created which can
  3321. be executed on computers running Windows.
  3322. U-Boot is intended to be simple to build. After installing the
  3323. sources you must configure U-Boot for one specific board type. This
  3324. is done by typing:
  3325. make NAME_config
  3326. where "NAME_config" is the name of one of the existing configu-
  3327. rations; see boards.cfg for supported names.
  3328. Note: for some board special configuration names may exist; check if
  3329. additional information is available from the board vendor; for
  3330. instance, the TQM823L systems are available without (standard)
  3331. or with LCD support. You can select such additional "features"
  3332. when choosing the configuration, i. e.
  3333. make TQM823L_config
  3334. - will configure for a plain TQM823L, i. e. no LCD support
  3335. make TQM823L_LCD_config
  3336. - will configure for a TQM823L with U-Boot console on LCD
  3337. etc.
  3338. Finally, type "make all", and you should get some working U-Boot
  3339. images ready for download to / installation on your system:
  3340. - "u-boot.bin" is a raw binary image
  3341. - "u-boot" is an image in ELF binary format
  3342. - "u-boot.srec" is in Motorola S-Record format
  3343. By default the build is performed locally and the objects are saved
  3344. in the source directory. One of the two methods can be used to change
  3345. this behavior and build U-Boot to some external directory:
  3346. 1. Add O= to the make command line invocations:
  3347. make O=/tmp/build distclean
  3348. make O=/tmp/build NAME_config
  3349. make O=/tmp/build all
  3350. 2. Set environment variable BUILD_DIR to point to the desired location:
  3351. export BUILD_DIR=/tmp/build
  3352. make distclean
  3353. make NAME_config
  3354. make all
  3355. Note that the command line "O=" setting overrides the BUILD_DIR environment
  3356. variable.
  3357. Please be aware that the Makefiles assume you are using GNU make, so
  3358. for instance on NetBSD you might need to use "gmake" instead of
  3359. native "make".
  3360. If the system board that you have is not listed, then you will need
  3361. to port U-Boot to your hardware platform. To do this, follow these
  3362. steps:
  3363. 1. Add a new configuration option for your board to the toplevel
  3364. "boards.cfg" file, using the existing entries as examples.
  3365. Follow the instructions there to keep the boards in order.
  3366. 2. Create a new directory to hold your board specific code. Add any
  3367. files you need. In your board directory, you will need at least
  3368. the "Makefile", a "<board>.c", "flash.c" and "u-boot.lds".
  3369. 3. Create a new configuration file "include/configs/<board>.h" for
  3370. your board
  3371. 3. If you're porting U-Boot to a new CPU, then also create a new
  3372. directory to hold your CPU specific code. Add any files you need.
  3373. 4. Run "make <board>_config" with your new name.
  3374. 5. Type "make", and you should get a working "u-boot.srec" file
  3375. to be installed on your target system.
  3376. 6. Debug and solve any problems that might arise.
  3377. [Of course, this last step is much harder than it sounds.]
  3378. Testing of U-Boot Modifications, Ports to New Hardware, etc.:
  3379. ==============================================================
  3380. If you have modified U-Boot sources (for instance added a new board
  3381. or support for new devices, a new CPU, etc.) you are expected to
  3382. provide feedback to the other developers. The feedback normally takes
  3383. the form of a "patch", i. e. a context diff against a certain (latest
  3384. official or latest in the git repository) version of U-Boot sources.
  3385. But before you submit such a patch, please verify that your modifi-
  3386. cation did not break existing code. At least make sure that *ALL* of
  3387. the supported boards compile WITHOUT ANY compiler warnings. To do so,
  3388. just run the "MAKEALL" script, which will configure and build U-Boot
  3389. for ALL supported system. Be warned, this will take a while. You can
  3390. select which (cross) compiler to use by passing a `CROSS_COMPILE'
  3391. environment variable to the script, i. e. to use the ELDK cross tools
  3392. you can type
  3393. CROSS_COMPILE=ppc_8xx- MAKEALL
  3394. or to build on a native PowerPC system you can type
  3395. CROSS_COMPILE=' ' MAKEALL
  3396. When using the MAKEALL script, the default behaviour is to build
  3397. U-Boot in the source directory. This location can be changed by
  3398. setting the BUILD_DIR environment variable. Also, for each target
  3399. built, the MAKEALL script saves two log files (<target>.ERR and
  3400. <target>.MAKEALL) in the <source dir>/LOG directory. This default
  3401. location can be changed by setting the MAKEALL_LOGDIR environment
  3402. variable. For example:
  3403. export BUILD_DIR=/tmp/build
  3404. export MAKEALL_LOGDIR=/tmp/log
  3405. CROSS_COMPILE=ppc_8xx- MAKEALL
  3406. With the above settings build objects are saved in the /tmp/build,
  3407. log files are saved in the /tmp/log and the source tree remains clean
  3408. during the whole build process.
  3409. See also "U-Boot Porting Guide" below.
  3410. Monitor Commands - Overview:
  3411. ============================
  3412. go - start application at address 'addr'
  3413. run - run commands in an environment variable
  3414. bootm - boot application image from memory
  3415. bootp - boot image via network using BootP/TFTP protocol
  3416. bootz - boot zImage from memory
  3417. tftpboot- boot image via network using TFTP protocol
  3418. and env variables "ipaddr" and "serverip"
  3419. (and eventually "gatewayip")
  3420. tftpput - upload a file via network using TFTP protocol
  3421. rarpboot- boot image via network using RARP/TFTP protocol
  3422. diskboot- boot from IDE devicebootd - boot default, i.e., run 'bootcmd'
  3423. loads - load S-Record file over serial line
  3424. loadb - load binary file over serial line (kermit mode)
  3425. md - memory display
  3426. mm - memory modify (auto-incrementing)
  3427. nm - memory modify (constant address)
  3428. mw - memory write (fill)
  3429. cp - memory copy
  3430. cmp - memory compare
  3431. crc32 - checksum calculation
  3432. i2c - I2C sub-system
  3433. sspi - SPI utility commands
  3434. base - print or set address offset
  3435. printenv- print environment variables
  3436. setenv - set environment variables
  3437. saveenv - save environment variables to persistent storage
  3438. protect - enable or disable FLASH write protection
  3439. erase - erase FLASH memory
  3440. flinfo - print FLASH memory information
  3441. nand - NAND memory operations (see doc/README.nand)
  3442. bdinfo - print Board Info structure
  3443. iminfo - print header information for application image
  3444. coninfo - print console devices and informations
  3445. ide - IDE sub-system
  3446. loop - infinite loop on address range
  3447. loopw - infinite write loop on address range
  3448. mtest - simple RAM test
  3449. icache - enable or disable instruction cache
  3450. dcache - enable or disable data cache
  3451. reset - Perform RESET of the CPU
  3452. echo - echo args to console
  3453. version - print monitor version
  3454. help - print online help
  3455. ? - alias for 'help'
  3456. Monitor Commands - Detailed Description:
  3457. ========================================
  3458. TODO.
  3459. For now: just type "help <command>".
  3460. Environment Variables:
  3461. ======================
  3462. U-Boot supports user configuration using Environment Variables which
  3463. can be made persistent by saving to Flash memory.
  3464. Environment Variables are set using "setenv", printed using
  3465. "printenv", and saved to Flash using "saveenv". Using "setenv"
  3466. without a value can be used to delete a variable from the
  3467. environment. As long as you don't save the environment you are
  3468. working with an in-memory copy. In case the Flash area containing the
  3469. environment is erased by accident, a default environment is provided.
  3470. Some configuration options can be set using Environment Variables.
  3471. List of environment variables (most likely not complete):
  3472. baudrate - see CONFIG_BAUDRATE
  3473. bootdelay - see CONFIG_BOOTDELAY
  3474. bootcmd - see CONFIG_BOOTCOMMAND
  3475. bootargs - Boot arguments when booting an RTOS image
  3476. bootfile - Name of the image to load with TFTP
  3477. bootm_low - Memory range available for image processing in the bootm
  3478. command can be restricted. This variable is given as
  3479. a hexadecimal number and defines lowest address allowed
  3480. for use by the bootm command. See also "bootm_size"
  3481. environment variable. Address defined by "bootm_low" is
  3482. also the base of the initial memory mapping for the Linux
  3483. kernel -- see the description of CONFIG_SYS_BOOTMAPSZ and
  3484. bootm_mapsize.
  3485. bootm_mapsize - Size of the initial memory mapping for the Linux kernel.
  3486. This variable is given as a hexadecimal number and it
  3487. defines the size of the memory region starting at base
  3488. address bootm_low that is accessible by the Linux kernel
  3489. during early boot. If unset, CONFIG_SYS_BOOTMAPSZ is used
  3490. as the default value if it is defined, and bootm_size is
  3491. used otherwise.
  3492. bootm_size - Memory range available for image processing in the bootm
  3493. command can be restricted. This variable is given as
  3494. a hexadecimal number and defines the size of the region
  3495. allowed for use by the bootm command. See also "bootm_low"
  3496. environment variable.
  3497. updatefile - Location of the software update file on a TFTP server, used
  3498. by the automatic software update feature. Please refer to
  3499. documentation in doc/README.update for more details.
  3500. autoload - if set to "no" (any string beginning with 'n'),
  3501. "bootp" will just load perform a lookup of the
  3502. configuration from the BOOTP server, but not try to
  3503. load any image using TFTP
  3504. autostart - if set to "yes", an image loaded using the "bootp",
  3505. "rarpboot", "tftpboot" or "diskboot" commands will
  3506. be automatically started (by internally calling
  3507. "bootm")
  3508. If set to "no", a standalone image passed to the
  3509. "bootm" command will be copied to the load address
  3510. (and eventually uncompressed), but NOT be started.
  3511. This can be used to load and uncompress arbitrary
  3512. data.
  3513. fdt_high - if set this restricts the maximum address that the
  3514. flattened device tree will be copied into upon boot.
  3515. For example, if you have a system with 1 GB memory
  3516. at physical address 0x10000000, while Linux kernel
  3517. only recognizes the first 704 MB as low memory, you
  3518. may need to set fdt_high as 0x3C000000 to have the
  3519. device tree blob be copied to the maximum address
  3520. of the 704 MB low memory, so that Linux kernel can
  3521. access it during the boot procedure.
  3522. If this is set to the special value 0xFFFFFFFF then
  3523. the fdt will not be copied at all on boot. For this
  3524. to work it must reside in writable memory, have
  3525. sufficient padding on the end of it for u-boot to
  3526. add the information it needs into it, and the memory
  3527. must be accessible by the kernel.
  3528. fdtcontroladdr- if set this is the address of the control flattened
  3529. device tree used by U-Boot when CONFIG_OF_CONTROL is
  3530. defined.
  3531. i2cfast - (PPC405GP|PPC405EP only)
  3532. if set to 'y' configures Linux I2C driver for fast
  3533. mode (400kHZ). This environment variable is used in
  3534. initialization code. So, for changes to be effective
  3535. it must be saved and board must be reset.
  3536. initrd_high - restrict positioning of initrd images:
  3537. If this variable is not set, initrd images will be
  3538. copied to the highest possible address in RAM; this
  3539. is usually what you want since it allows for
  3540. maximum initrd size. If for some reason you want to
  3541. make sure that the initrd image is loaded below the
  3542. CONFIG_SYS_BOOTMAPSZ limit, you can set this environment
  3543. variable to a value of "no" or "off" or "0".
  3544. Alternatively, you can set it to a maximum upper
  3545. address to use (U-Boot will still check that it
  3546. does not overwrite the U-Boot stack and data).
  3547. For instance, when you have a system with 16 MB
  3548. RAM, and want to reserve 4 MB from use by Linux,
  3549. you can do this by adding "mem=12M" to the value of
  3550. the "bootargs" variable. However, now you must make
  3551. sure that the initrd image is placed in the first
  3552. 12 MB as well - this can be done with
  3553. setenv initrd_high 00c00000
  3554. If you set initrd_high to 0xFFFFFFFF, this is an
  3555. indication to U-Boot that all addresses are legal
  3556. for the Linux kernel, including addresses in flash
  3557. memory. In this case U-Boot will NOT COPY the
  3558. ramdisk at all. This may be useful to reduce the
  3559. boot time on your system, but requires that this
  3560. feature is supported by your Linux kernel.
  3561. ipaddr - IP address; needed for tftpboot command
  3562. loadaddr - Default load address for commands like "bootp",
  3563. "rarpboot", "tftpboot", "loadb" or "diskboot"
  3564. loads_echo - see CONFIG_LOADS_ECHO
  3565. serverip - TFTP server IP address; needed for tftpboot command
  3566. bootretry - see CONFIG_BOOT_RETRY_TIME
  3567. bootdelaykey - see CONFIG_AUTOBOOT_DELAY_STR
  3568. bootstopkey - see CONFIG_AUTOBOOT_STOP_STR
  3569. ethprime - controls which interface is used first.
  3570. ethact - controls which interface is currently active.
  3571. For example you can do the following
  3572. => setenv ethact FEC
  3573. => ping 192.168.0.1 # traffic sent on FEC
  3574. => setenv ethact SCC
  3575. => ping 10.0.0.1 # traffic sent on SCC
  3576. ethrotate - When set to "no" U-Boot does not go through all
  3577. available network interfaces.
  3578. It just stays at the currently selected interface.
  3579. netretry - When set to "no" each network operation will
  3580. either succeed or fail without retrying.
  3581. When set to "once" the network operation will
  3582. fail when all the available network interfaces
  3583. are tried once without success.
  3584. Useful on scripts which control the retry operation
  3585. themselves.
  3586. npe_ucode - set load address for the NPE microcode
  3587. silent_linux - If set then linux will be told to boot silently, by
  3588. changing the console to be empty. If "yes" it will be
  3589. made silent. If "no" it will not be made silent. If
  3590. unset, then it will be made silent if the U-Boot console
  3591. is silent.
  3592. tftpsrcport - If this is set, the value is used for TFTP's
  3593. UDP source port.
  3594. tftpdstport - If this is set, the value is used for TFTP's UDP
  3595. destination port instead of the Well Know Port 69.
  3596. tftpblocksize - Block size to use for TFTP transfers; if not set,
  3597. we use the TFTP server's default block size
  3598. tftptimeout - Retransmission timeout for TFTP packets (in milli-
  3599. seconds, minimum value is 1000 = 1 second). Defines
  3600. when a packet is considered to be lost so it has to
  3601. be retransmitted. The default is 5000 = 5 seconds.
  3602. Lowering this value may make downloads succeed
  3603. faster in networks with high packet loss rates or
  3604. with unreliable TFTP servers.
  3605. vlan - When set to a value < 4095 the traffic over
  3606. Ethernet is encapsulated/received over 802.1q
  3607. VLAN tagged frames.
  3608. The following image location variables contain the location of images
  3609. used in booting. The "Image" column gives the role of the image and is
  3610. not an environment variable name. The other columns are environment
  3611. variable names. "File Name" gives the name of the file on a TFTP
  3612. server, "RAM Address" gives the location in RAM the image will be
  3613. loaded to, and "Flash Location" gives the image's address in NOR
  3614. flash or offset in NAND flash.
  3615. *Note* - these variables don't have to be defined for all boards, some
  3616. boards currenlty use other variables for these purposes, and some
  3617. boards use these variables for other purposes.
  3618. Image File Name RAM Address Flash Location
  3619. ----- --------- ----------- --------------
  3620. u-boot u-boot u-boot_addr_r u-boot_addr
  3621. Linux kernel bootfile kernel_addr_r kernel_addr
  3622. device tree blob fdtfile fdt_addr_r fdt_addr
  3623. ramdisk ramdiskfile ramdisk_addr_r ramdisk_addr
  3624. The following environment variables may be used and automatically
  3625. updated by the network boot commands ("bootp" and "rarpboot"),
  3626. depending the information provided by your boot server:
  3627. bootfile - see above
  3628. dnsip - IP address of your Domain Name Server
  3629. dnsip2 - IP address of your secondary Domain Name Server
  3630. gatewayip - IP address of the Gateway (Router) to use
  3631. hostname - Target hostname
  3632. ipaddr - see above
  3633. netmask - Subnet Mask
  3634. rootpath - Pathname of the root filesystem on the NFS server
  3635. serverip - see above
  3636. There are two special Environment Variables:
  3637. serial# - contains hardware identification information such
  3638. as type string and/or serial number
  3639. ethaddr - Ethernet address
  3640. These variables can be set only once (usually during manufacturing of
  3641. the board). U-Boot refuses to delete or overwrite these variables
  3642. once they have been set once.
  3643. Further special Environment Variables:
  3644. ver - Contains the U-Boot version string as printed
  3645. with the "version" command. This variable is
  3646. readonly (see CONFIG_VERSION_VARIABLE).
  3647. Please note that changes to some configuration parameters may take
  3648. only effect after the next boot (yes, that's just like Windoze :-).
  3649. Callback functions for environment variables:
  3650. ---------------------------------------------
  3651. For some environment variables, the behavior of u-boot needs to change
  3652. when their values are changed. This functionailty allows functions to
  3653. be associated with arbitrary variables. On creation, overwrite, or
  3654. deletion, the callback will provide the opportunity for some side
  3655. effect to happen or for the change to be rejected.
  3656. The callbacks are named and associated with a function using the
  3657. U_BOOT_ENV_CALLBACK macro in your board or driver code.
  3658. These callbacks are associated with variables in one of two ways. The
  3659. static list can be added to by defining CONFIG_ENV_CALLBACK_LIST_STATIC
  3660. in the board configuration to a string that defines a list of
  3661. associations. The list must be in the following format:
  3662. entry = variable_name[:callback_name]
  3663. list = entry[,list]
  3664. If the callback name is not specified, then the callback is deleted.
  3665. Spaces are also allowed anywhere in the list.
  3666. Callbacks can also be associated by defining the ".callbacks" variable
  3667. with the same list format above. Any association in ".callbacks" will
  3668. override any association in the static list. You can define
  3669. CONFIG_ENV_CALLBACK_LIST_DEFAULT to a list (string) to define the
  3670. ".callbacks" envirnoment variable in the default or embedded environment.
  3671. Command Line Parsing:
  3672. =====================
  3673. There are two different command line parsers available with U-Boot:
  3674. the old "simple" one, and the much more powerful "hush" shell:
  3675. Old, simple command line parser:
  3676. --------------------------------
  3677. - supports environment variables (through setenv / saveenv commands)
  3678. - several commands on one line, separated by ';'
  3679. - variable substitution using "... ${name} ..." syntax
  3680. - special characters ('$', ';') can be escaped by prefixing with '\',
  3681. for example:
  3682. setenv bootcmd bootm \${address}
  3683. - You can also escape text by enclosing in single apostrophes, for example:
  3684. setenv addip 'setenv bootargs $bootargs ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname::off'
  3685. Hush shell:
  3686. -----------
  3687. - similar to Bourne shell, with control structures like
  3688. if...then...else...fi, for...do...done; while...do...done,
  3689. until...do...done, ...
  3690. - supports environment ("global") variables (through setenv / saveenv
  3691. commands) and local shell variables (through standard shell syntax
  3692. "name=value"); only environment variables can be used with "run"
  3693. command
  3694. General rules:
  3695. --------------
  3696. (1) If a command line (or an environment variable executed by a "run"
  3697. command) contains several commands separated by semicolon, and
  3698. one of these commands fails, then the remaining commands will be
  3699. executed anyway.
  3700. (2) If you execute several variables with one call to run (i. e.
  3701. calling run with a list of variables as arguments), any failing
  3702. command will cause "run" to terminate, i. e. the remaining
  3703. variables are not executed.
  3704. Note for Redundant Ethernet Interfaces:
  3705. =======================================
  3706. Some boards come with redundant Ethernet interfaces; U-Boot supports
  3707. such configurations and is capable of automatic selection of a
  3708. "working" interface when needed. MAC assignment works as follows:
  3709. Network interfaces are numbered eth0, eth1, eth2, ... Corresponding
  3710. MAC addresses can be stored in the environment as "ethaddr" (=>eth0),
  3711. "eth1addr" (=>eth1), "eth2addr", ...
  3712. If the network interface stores some valid MAC address (for instance
  3713. in SROM), this is used as default address if there is NO correspon-
  3714. ding setting in the environment; if the corresponding environment
  3715. variable is set, this overrides the settings in the card; that means:
  3716. o If the SROM has a valid MAC address, and there is no address in the
  3717. environment, the SROM's address is used.
  3718. o If there is no valid address in the SROM, and a definition in the
  3719. environment exists, then the value from the environment variable is
  3720. used.
  3721. o If both the SROM and the environment contain a MAC address, and
  3722. both addresses are the same, this MAC address is used.
  3723. o If both the SROM and the environment contain a MAC address, and the
  3724. addresses differ, the value from the environment is used and a
  3725. warning is printed.
  3726. o If neither SROM nor the environment contain a MAC address, an error
  3727. is raised.
  3728. If Ethernet drivers implement the 'write_hwaddr' function, valid MAC addresses
  3729. will be programmed into hardware as part of the initialization process. This
  3730. may be skipped by setting the appropriate 'ethmacskip' environment variable.
  3731. The naming convention is as follows:
  3732. "ethmacskip" (=>eth0), "eth1macskip" (=>eth1) etc.
  3733. Image Formats:
  3734. ==============
  3735. U-Boot is capable of booting (and performing other auxiliary operations on)
  3736. images in two formats:
  3737. New uImage format (FIT)
  3738. -----------------------
  3739. Flexible and powerful format based on Flattened Image Tree -- FIT (similar
  3740. to Flattened Device Tree). It allows the use of images with multiple
  3741. components (several kernels, ramdisks, etc.), with contents protected by
  3742. SHA1, MD5 or CRC32. More details are found in the doc/uImage.FIT directory.
  3743. Old uImage format
  3744. -----------------
  3745. Old image format is based on binary files which can be basically anything,
  3746. preceded by a special header; see the definitions in include/image.h for
  3747. details; basically, the header defines the following image properties:
  3748. * Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD,
  3749. 4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks,
  3750. LynxOS, pSOS, QNX, RTEMS, INTEGRITY;
  3751. Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, LynxOS,
  3752. INTEGRITY).
  3753. * Target CPU Architecture (Provisions for Alpha, ARM, AVR32, Intel x86,
  3754. IA64, MIPS, NDS32, Nios II, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit;
  3755. Currently supported: ARM, AVR32, Intel x86, MIPS, NDS32, Nios II, PowerPC).
  3756. * Compression Type (uncompressed, gzip, bzip2)
  3757. * Load Address
  3758. * Entry Point
  3759. * Image Name
  3760. * Image Timestamp
  3761. The header is marked by a special Magic Number, and both the header
  3762. and the data portions of the image are secured against corruption by
  3763. CRC32 checksums.
  3764. Linux Support:
  3765. ==============
  3766. Although U-Boot should support any OS or standalone application
  3767. easily, the main focus has always been on Linux during the design of
  3768. U-Boot.
  3769. U-Boot includes many features that so far have been part of some
  3770. special "boot loader" code within the Linux kernel. Also, any
  3771. "initrd" images to be used are no longer part of one big Linux image;
  3772. instead, kernel and "initrd" are separate images. This implementation
  3773. serves several purposes:
  3774. - the same features can be used for other OS or standalone
  3775. applications (for instance: using compressed images to reduce the
  3776. Flash memory footprint)
  3777. - it becomes much easier to port new Linux kernel versions because
  3778. lots of low-level, hardware dependent stuff are done by U-Boot
  3779. - the same Linux kernel image can now be used with different "initrd"
  3780. images; of course this also means that different kernel images can
  3781. be run with the same "initrd". This makes testing easier (you don't
  3782. have to build a new "zImage.initrd" Linux image when you just
  3783. change a file in your "initrd"). Also, a field-upgrade of the
  3784. software is easier now.
  3785. Linux HOWTO:
  3786. ============
  3787. Porting Linux to U-Boot based systems:
  3788. ---------------------------------------
  3789. U-Boot cannot save you from doing all the necessary modifications to
  3790. configure the Linux device drivers for use with your target hardware
  3791. (no, we don't intend to provide a full virtual machine interface to
  3792. Linux :-).
  3793. But now you can ignore ALL boot loader code (in arch/powerpc/mbxboot).
  3794. Just make sure your machine specific header file (for instance
  3795. include/asm-ppc/tqm8xx.h) includes the same definition of the Board
  3796. Information structure as we define in include/asm-<arch>/u-boot.h,
  3797. and make sure that your definition of IMAP_ADDR uses the same value
  3798. as your U-Boot configuration in CONFIG_SYS_IMMR.
  3799. Configuring the Linux kernel:
  3800. -----------------------------
  3801. No specific requirements for U-Boot. Make sure you have some root
  3802. device (initial ramdisk, NFS) for your target system.
  3803. Building a Linux Image:
  3804. -----------------------
  3805. With U-Boot, "normal" build targets like "zImage" or "bzImage" are
  3806. not used. If you use recent kernel source, a new build target
  3807. "uImage" will exist which automatically builds an image usable by
  3808. U-Boot. Most older kernels also have support for a "pImage" target,
  3809. which was introduced for our predecessor project PPCBoot and uses a
  3810. 100% compatible format.
  3811. Example:
  3812. make TQM850L_config
  3813. make oldconfig
  3814. make dep
  3815. make uImage
  3816. The "uImage" build target uses a special tool (in 'tools/mkimage') to
  3817. encapsulate a compressed Linux kernel image with header information,
  3818. CRC32 checksum etc. for use with U-Boot. This is what we are doing:
  3819. * build a standard "vmlinux" kernel image (in ELF binary format):
  3820. * convert the kernel into a raw binary image:
  3821. ${CROSS_COMPILE}-objcopy -O binary \
  3822. -R .note -R .comment \
  3823. -S vmlinux linux.bin
  3824. * compress the binary image:
  3825. gzip -9 linux.bin
  3826. * package compressed binary image for U-Boot:
  3827. mkimage -A ppc -O linux -T kernel -C gzip \
  3828. -a 0 -e 0 -n "Linux Kernel Image" \
  3829. -d linux.bin.gz uImage
  3830. The "mkimage" tool can also be used to create ramdisk images for use
  3831. with U-Boot, either separated from the Linux kernel image, or
  3832. combined into one file. "mkimage" encapsulates the images with a 64
  3833. byte header containing information about target architecture,
  3834. operating system, image type, compression method, entry points, time
  3835. stamp, CRC32 checksums, etc.
  3836. "mkimage" can be called in two ways: to verify existing images and
  3837. print the header information, or to build new images.
  3838. In the first form (with "-l" option) mkimage lists the information
  3839. contained in the header of an existing U-Boot image; this includes
  3840. checksum verification:
  3841. tools/mkimage -l image
  3842. -l ==> list image header information
  3843. The second form (with "-d" option) is used to build a U-Boot image
  3844. from a "data file" which is used as image payload:
  3845. tools/mkimage -A arch -O os -T type -C comp -a addr -e ep \
  3846. -n name -d data_file image
  3847. -A ==> set architecture to 'arch'
  3848. -O ==> set operating system to 'os'
  3849. -T ==> set image type to 'type'
  3850. -C ==> set compression type 'comp'
  3851. -a ==> set load address to 'addr' (hex)
  3852. -e ==> set entry point to 'ep' (hex)
  3853. -n ==> set image name to 'name'
  3854. -d ==> use image data from 'datafile'
  3855. Right now, all Linux kernels for PowerPC systems use the same load
  3856. address (0x00000000), but the entry point address depends on the
  3857. kernel version:
  3858. - 2.2.x kernels have the entry point at 0x0000000C,
  3859. - 2.3.x and later kernels have the entry point at 0x00000000.
  3860. So a typical call to build a U-Boot image would read:
  3861. -> tools/mkimage -n '2.4.4 kernel for TQM850L' \
  3862. > -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \
  3863. > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz \
  3864. > examples/uImage.TQM850L
  3865. Image Name: 2.4.4 kernel for TQM850L
  3866. Created: Wed Jul 19 02:34:59 2000
  3867. Image Type: PowerPC Linux Kernel Image (gzip compressed)
  3868. Data Size: 335725 Bytes = 327.86 kB = 0.32 MB
  3869. Load Address: 0x00000000
  3870. Entry Point: 0x00000000
  3871. To verify the contents of the image (or check for corruption):
  3872. -> tools/mkimage -l examples/uImage.TQM850L
  3873. Image Name: 2.4.4 kernel for TQM850L
  3874. Created: Wed Jul 19 02:34:59 2000
  3875. Image Type: PowerPC Linux Kernel Image (gzip compressed)
  3876. Data Size: 335725 Bytes = 327.86 kB = 0.32 MB
  3877. Load Address: 0x00000000
  3878. Entry Point: 0x00000000
  3879. NOTE: for embedded systems where boot time is critical you can trade
  3880. speed for memory and install an UNCOMPRESSED image instead: this
  3881. needs more space in Flash, but boots much faster since it does not
  3882. need to be uncompressed:
  3883. -> gunzip /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz
  3884. -> tools/mkimage -n '2.4.4 kernel for TQM850L' \
  3885. > -A ppc -O linux -T kernel -C none -a 0 -e 0 \
  3886. > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux \
  3887. > examples/uImage.TQM850L-uncompressed
  3888. Image Name: 2.4.4 kernel for TQM850L
  3889. Created: Wed Jul 19 02:34:59 2000
  3890. Image Type: PowerPC Linux Kernel Image (uncompressed)
  3891. Data Size: 792160 Bytes = 773.59 kB = 0.76 MB
  3892. Load Address: 0x00000000
  3893. Entry Point: 0x00000000
  3894. Similar you can build U-Boot images from a 'ramdisk.image.gz' file
  3895. when your kernel is intended to use an initial ramdisk:
  3896. -> tools/mkimage -n 'Simple Ramdisk Image' \
  3897. > -A ppc -O linux -T ramdisk -C gzip \
  3898. > -d /LinuxPPC/images/SIMPLE-ramdisk.image.gz examples/simple-initrd
  3899. Image Name: Simple Ramdisk Image
  3900. Created: Wed Jan 12 14:01:50 2000
  3901. Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
  3902. Data Size: 566530 Bytes = 553.25 kB = 0.54 MB
  3903. Load Address: 0x00000000
  3904. Entry Point: 0x00000000
  3905. Installing a Linux Image:
  3906. -------------------------
  3907. To downloading a U-Boot image over the serial (console) interface,
  3908. you must convert the image to S-Record format:
  3909. objcopy -I binary -O srec examples/image examples/image.srec
  3910. The 'objcopy' does not understand the information in the U-Boot
  3911. image header, so the resulting S-Record file will be relative to
  3912. address 0x00000000. To load it to a given address, you need to
  3913. specify the target address as 'offset' parameter with the 'loads'
  3914. command.
  3915. Example: install the image to address 0x40100000 (which on the
  3916. TQM8xxL is in the first Flash bank):
  3917. => erase 40100000 401FFFFF
  3918. .......... done
  3919. Erased 8 sectors
  3920. => loads 40100000
  3921. ## Ready for S-Record download ...
  3922. ~>examples/image.srec
  3923. 1 2 3 4 5 6 7 8 9 10 11 12 13 ...
  3924. ...
  3925. 15989 15990 15991 15992
  3926. [file transfer complete]
  3927. [connected]
  3928. ## Start Addr = 0x00000000
  3929. You can check the success of the download using the 'iminfo' command;
  3930. this includes a checksum verification so you can be sure no data
  3931. corruption happened:
  3932. => imi 40100000
  3933. ## Checking Image at 40100000 ...
  3934. Image Name: 2.2.13 for initrd on TQM850L
  3935. Image Type: PowerPC Linux Kernel Image (gzip compressed)
  3936. Data Size: 335725 Bytes = 327 kB = 0 MB
  3937. Load Address: 00000000
  3938. Entry Point: 0000000c
  3939. Verifying Checksum ... OK
  3940. Boot Linux:
  3941. -----------
  3942. The "bootm" command is used to boot an application that is stored in
  3943. memory (RAM or Flash). In case of a Linux kernel image, the contents
  3944. of the "bootargs" environment variable is passed to the kernel as
  3945. parameters. You can check and modify this variable using the
  3946. "printenv" and "setenv" commands:
  3947. => printenv bootargs
  3948. bootargs=root=/dev/ram
  3949. => setenv bootargs root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
  3950. => printenv bootargs
  3951. bootargs=root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
  3952. => bootm 40020000
  3953. ## Booting Linux kernel at 40020000 ...
  3954. Image Name: 2.2.13 for NFS on TQM850L
  3955. Image Type: PowerPC Linux Kernel Image (gzip compressed)
  3956. Data Size: 381681 Bytes = 372 kB = 0 MB
  3957. Load Address: 00000000
  3958. Entry Point: 0000000c
  3959. Verifying Checksum ... OK
  3960. Uncompressing Kernel Image ... OK
  3961. Linux version 2.2.13 (wd@denx.local.net) (gcc version 2.95.2 19991024 (release)) #1 Wed Jul 19 02:35:17 MEST 2000
  3962. Boot arguments: root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
  3963. time_init: decrementer frequency = 187500000/60
  3964. Calibrating delay loop... 49.77 BogoMIPS
  3965. Memory: 15208k available (700k kernel code, 444k data, 32k init) [c0000000,c1000000]
  3966. ...
  3967. If you want to boot a Linux kernel with initial RAM disk, you pass
  3968. the memory addresses of both the kernel and the initrd image (PPBCOOT
  3969. format!) to the "bootm" command:
  3970. => imi 40100000 40200000
  3971. ## Checking Image at 40100000 ...
  3972. Image Name: 2.2.13 for initrd on TQM850L
  3973. Image Type: PowerPC Linux Kernel Image (gzip compressed)
  3974. Data Size: 335725 Bytes = 327 kB = 0 MB
  3975. Load Address: 00000000
  3976. Entry Point: 0000000c
  3977. Verifying Checksum ... OK
  3978. ## Checking Image at 40200000 ...
  3979. Image Name: Simple Ramdisk Image
  3980. Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
  3981. Data Size: 566530 Bytes = 553 kB = 0 MB
  3982. Load Address: 00000000
  3983. Entry Point: 00000000
  3984. Verifying Checksum ... OK
  3985. => bootm 40100000 40200000
  3986. ## Booting Linux kernel at 40100000 ...
  3987. Image Name: 2.2.13 for initrd on TQM850L
  3988. Image Type: PowerPC Linux Kernel Image (gzip compressed)
  3989. Data Size: 335725 Bytes = 327 kB = 0 MB
  3990. Load Address: 00000000
  3991. Entry Point: 0000000c
  3992. Verifying Checksum ... OK
  3993. Uncompressing Kernel Image ... OK
  3994. ## Loading RAMDisk Image at 40200000 ...
  3995. Image Name: Simple Ramdisk Image
  3996. Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
  3997. Data Size: 566530 Bytes = 553 kB = 0 MB
  3998. Load Address: 00000000
  3999. Entry Point: 00000000
  4000. Verifying Checksum ... OK
  4001. Loading Ramdisk ... OK
  4002. Linux version 2.2.13 (wd@denx.local.net) (gcc version 2.95.2 19991024 (release)) #1 Wed Jul 19 02:32:08 MEST 2000
  4003. Boot arguments: root=/dev/ram
  4004. time_init: decrementer frequency = 187500000/60
  4005. Calibrating delay loop... 49.77 BogoMIPS
  4006. ...
  4007. RAMDISK: Compressed image found at block 0
  4008. VFS: Mounted root (ext2 filesystem).
  4009. bash#
  4010. Boot Linux and pass a flat device tree:
  4011. -----------
  4012. First, U-Boot must be compiled with the appropriate defines. See the section
  4013. titled "Linux Kernel Interface" above for a more in depth explanation. The
  4014. following is an example of how to start a kernel and pass an updated
  4015. flat device tree:
  4016. => print oftaddr
  4017. oftaddr=0x300000
  4018. => print oft
  4019. oft=oftrees/mpc8540ads.dtb
  4020. => tftp $oftaddr $oft
  4021. Speed: 1000, full duplex
  4022. Using TSEC0 device
  4023. TFTP from server 192.168.1.1; our IP address is 192.168.1.101
  4024. Filename 'oftrees/mpc8540ads.dtb'.
  4025. Load address: 0x300000
  4026. Loading: #
  4027. done
  4028. Bytes transferred = 4106 (100a hex)
  4029. => tftp $loadaddr $bootfile
  4030. Speed: 1000, full duplex
  4031. Using TSEC0 device
  4032. TFTP from server 192.168.1.1; our IP address is 192.168.1.2
  4033. Filename 'uImage'.
  4034. Load address: 0x200000
  4035. Loading:############
  4036. done
  4037. Bytes transferred = 1029407 (fb51f hex)
  4038. => print loadaddr
  4039. loadaddr=200000
  4040. => print oftaddr
  4041. oftaddr=0x300000
  4042. => bootm $loadaddr - $oftaddr
  4043. ## Booting image at 00200000 ...
  4044. Image Name: Linux-2.6.17-dirty
  4045. Image Type: PowerPC Linux Kernel Image (gzip compressed)
  4046. Data Size: 1029343 Bytes = 1005.2 kB
  4047. Load Address: 00000000
  4048. Entry Point: 00000000
  4049. Verifying Checksum ... OK
  4050. Uncompressing Kernel Image ... OK
  4051. Booting using flat device tree at 0x300000
  4052. Using MPC85xx ADS machine description
  4053. Memory CAM mapping: CAM0=256Mb, CAM1=256Mb, CAM2=0Mb residual: 0Mb
  4054. [snip]
  4055. More About U-Boot Image Types:
  4056. ------------------------------
  4057. U-Boot supports the following image types:
  4058. "Standalone Programs" are directly runnable in the environment
  4059. provided by U-Boot; it is expected that (if they behave
  4060. well) you can continue to work in U-Boot after return from
  4061. the Standalone Program.
  4062. "OS Kernel Images" are usually images of some Embedded OS which
  4063. will take over control completely. Usually these programs
  4064. will install their own set of exception handlers, device
  4065. drivers, set up the MMU, etc. - this means, that you cannot
  4066. expect to re-enter U-Boot except by resetting the CPU.
  4067. "RAMDisk Images" are more or less just data blocks, and their
  4068. parameters (address, size) are passed to an OS kernel that is
  4069. being started.
  4070. "Multi-File Images" contain several images, typically an OS
  4071. (Linux) kernel image and one or more data images like
  4072. RAMDisks. This construct is useful for instance when you want
  4073. to boot over the network using BOOTP etc., where the boot
  4074. server provides just a single image file, but you want to get
  4075. for instance an OS kernel and a RAMDisk image.
  4076. "Multi-File Images" start with a list of image sizes, each
  4077. image size (in bytes) specified by an "uint32_t" in network
  4078. byte order. This list is terminated by an "(uint32_t)0".
  4079. Immediately after the terminating 0 follow the images, one by
  4080. one, all aligned on "uint32_t" boundaries (size rounded up to
  4081. a multiple of 4 bytes).
  4082. "Firmware Images" are binary images containing firmware (like
  4083. U-Boot or FPGA images) which usually will be programmed to
  4084. flash memory.
  4085. "Script files" are command sequences that will be executed by
  4086. U-Boot's command interpreter; this feature is especially
  4087. useful when you configure U-Boot to use a real shell (hush)
  4088. as command interpreter.
  4089. Booting the Linux zImage:
  4090. -------------------------
  4091. On some platforms, it's possible to boot Linux zImage. This is done
  4092. using the "bootz" command. The syntax of "bootz" command is the same
  4093. as the syntax of "bootm" command.
  4094. Note, defining the CONFIG_SUPPORT_RAW_INITRD allows user to supply
  4095. kernel with raw initrd images. The syntax is slightly different, the
  4096. address of the initrd must be augmented by it's size, in the following
  4097. format: "<initrd addres>:<initrd size>".
  4098. Standalone HOWTO:
  4099. =================
  4100. One of the features of U-Boot is that you can dynamically load and
  4101. run "standalone" applications, which can use some resources of
  4102. U-Boot like console I/O functions or interrupt services.
  4103. Two simple examples are included with the sources:
  4104. "Hello World" Demo:
  4105. -------------------
  4106. 'examples/hello_world.c' contains a small "Hello World" Demo
  4107. application; it is automatically compiled when you build U-Boot.
  4108. It's configured to run at address 0x00040004, so you can play with it
  4109. like that:
  4110. => loads
  4111. ## Ready for S-Record download ...
  4112. ~>examples/hello_world.srec
  4113. 1 2 3 4 5 6 7 8 9 10 11 ...
  4114. [file transfer complete]
  4115. [connected]
  4116. ## Start Addr = 0x00040004
  4117. => go 40004 Hello World! This is a test.
  4118. ## Starting application at 0x00040004 ...
  4119. Hello World
  4120. argc = 7
  4121. argv[0] = "40004"
  4122. argv[1] = "Hello"
  4123. argv[2] = "World!"
  4124. argv[3] = "This"
  4125. argv[4] = "is"
  4126. argv[5] = "a"
  4127. argv[6] = "test."
  4128. argv[7] = "<NULL>"
  4129. Hit any key to exit ...
  4130. ## Application terminated, rc = 0x0
  4131. Another example, which demonstrates how to register a CPM interrupt
  4132. handler with the U-Boot code, can be found in 'examples/timer.c'.
  4133. Here, a CPM timer is set up to generate an interrupt every second.
  4134. The interrupt service routine is trivial, just printing a '.'
  4135. character, but this is just a demo program. The application can be
  4136. controlled by the following keys:
  4137. ? - print current values og the CPM Timer registers
  4138. b - enable interrupts and start timer
  4139. e - stop timer and disable interrupts
  4140. q - quit application
  4141. => loads
  4142. ## Ready for S-Record download ...
  4143. ~>examples/timer.srec
  4144. 1 2 3 4 5 6 7 8 9 10 11 ...
  4145. [file transfer complete]
  4146. [connected]
  4147. ## Start Addr = 0x00040004
  4148. => go 40004
  4149. ## Starting application at 0x00040004 ...
  4150. TIMERS=0xfff00980
  4151. Using timer 1
  4152. tgcr @ 0xfff00980, tmr @ 0xfff00990, trr @ 0xfff00994, tcr @ 0xfff00998, tcn @ 0xfff0099c, ter @ 0xfff009b0
  4153. Hit 'b':
  4154. [q, b, e, ?] Set interval 1000000 us
  4155. Enabling timer
  4156. Hit '?':
  4157. [q, b, e, ?] ........
  4158. tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0xef6, ter=0x0
  4159. Hit '?':
  4160. [q, b, e, ?] .
  4161. tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x2ad4, ter=0x0
  4162. Hit '?':
  4163. [q, b, e, ?] .
  4164. tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x1efc, ter=0x0
  4165. Hit '?':
  4166. [q, b, e, ?] .
  4167. tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x169d, ter=0x0
  4168. Hit 'e':
  4169. [q, b, e, ?] ...Stopping timer
  4170. Hit 'q':
  4171. [q, b, e, ?] ## Application terminated, rc = 0x0
  4172. Minicom warning:
  4173. ================
  4174. Over time, many people have reported problems when trying to use the
  4175. "minicom" terminal emulation program for serial download. I (wd)
  4176. consider minicom to be broken, and recommend not to use it. Under
  4177. Unix, I recommend to use C-Kermit for general purpose use (and
  4178. especially for kermit binary protocol download ("loadb" command), and
  4179. use "cu" for S-Record download ("loads" command). See
  4180. http://www.denx.de/wiki/view/DULG/SystemSetup#Section_4.3.
  4181. for help with kermit.
  4182. Nevertheless, if you absolutely want to use it try adding this
  4183. configuration to your "File transfer protocols" section:
  4184. Name Program Name U/D FullScr IO-Red. Multi
  4185. X kermit /usr/bin/kermit -i -l %l -s Y U Y N N
  4186. Y kermit /usr/bin/kermit -i -l %l -r N D Y N N
  4187. NetBSD Notes:
  4188. =============
  4189. Starting at version 0.9.2, U-Boot supports NetBSD both as host
  4190. (build U-Boot) and target system (boots NetBSD/mpc8xx).
  4191. Building requires a cross environment; it is known to work on
  4192. NetBSD/i386 with the cross-powerpc-netbsd-1.3 package (you will also
  4193. need gmake since the Makefiles are not compatible with BSD make).
  4194. Note that the cross-powerpc package does not install include files;
  4195. attempting to build U-Boot will fail because <machine/ansi.h> is
  4196. missing. This file has to be installed and patched manually:
  4197. # cd /usr/pkg/cross/powerpc-netbsd/include
  4198. # mkdir powerpc
  4199. # ln -s powerpc machine
  4200. # cp /usr/src/sys/arch/powerpc/include/ansi.h powerpc/ansi.h
  4201. # ${EDIT} powerpc/ansi.h ## must remove __va_list, _BSD_VA_LIST
  4202. Native builds *don't* work due to incompatibilities between native
  4203. and U-Boot include files.
  4204. Booting assumes that (the first part of) the image booted is a
  4205. stage-2 loader which in turn loads and then invokes the kernel
  4206. proper. Loader sources will eventually appear in the NetBSD source
  4207. tree (probably in sys/arc/mpc8xx/stand/u-boot_stage2/); in the
  4208. meantime, see ftp://ftp.denx.de/pub/u-boot/ppcboot_stage2.tar.gz
  4209. Implementation Internals:
  4210. =========================
  4211. The following is not intended to be a complete description of every
  4212. implementation detail. However, it should help to understand the
  4213. inner workings of U-Boot and make it easier to port it to custom
  4214. hardware.
  4215. Initial Stack, Global Data:
  4216. ---------------------------
  4217. The implementation of U-Boot is complicated by the fact that U-Boot
  4218. starts running out of ROM (flash memory), usually without access to
  4219. system RAM (because the memory controller is not initialized yet).
  4220. This means that we don't have writable Data or BSS segments, and BSS
  4221. is not initialized as zero. To be able to get a C environment working
  4222. at all, we have to allocate at least a minimal stack. Implementation
  4223. options for this are defined and restricted by the CPU used: Some CPU
  4224. models provide on-chip memory (like the IMMR area on MPC8xx and
  4225. MPC826x processors), on others (parts of) the data cache can be
  4226. locked as (mis-) used as memory, etc.
  4227. Chris Hallinan posted a good summary of these issues to the
  4228. U-Boot mailing list:
  4229. Subject: RE: [U-Boot-Users] RE: More On Memory Bank x (nothingness)?
  4230. From: "Chris Hallinan" <clh@net1plus.com>
  4231. Date: Mon, 10 Feb 2003 16:43:46 -0500 (22:43 MET)
  4232. ...
  4233. Correct me if I'm wrong, folks, but the way I understand it
  4234. is this: Using DCACHE as initial RAM for Stack, etc, does not
  4235. require any physical RAM backing up the cache. The cleverness
  4236. is that the cache is being used as a temporary supply of
  4237. necessary storage before the SDRAM controller is setup. It's
  4238. beyond the scope of this list to explain the details, but you
  4239. can see how this works by studying the cache architecture and
  4240. operation in the architecture and processor-specific manuals.
  4241. OCM is On Chip Memory, which I believe the 405GP has 4K. It
  4242. is another option for the system designer to use as an
  4243. initial stack/RAM area prior to SDRAM being available. Either
  4244. option should work for you. Using CS 4 should be fine if your
  4245. board designers haven't used it for something that would
  4246. cause you grief during the initial boot! It is frequently not
  4247. used.
  4248. CONFIG_SYS_INIT_RAM_ADDR should be somewhere that won't interfere
  4249. with your processor/board/system design. The default value
  4250. you will find in any recent u-boot distribution in
  4251. walnut.h should work for you. I'd set it to a value larger
  4252. than your SDRAM module. If you have a 64MB SDRAM module, set
  4253. it above 400_0000. Just make sure your board has no resources
  4254. that are supposed to respond to that address! That code in
  4255. start.S has been around a while and should work as is when
  4256. you get the config right.
  4257. -Chris Hallinan
  4258. DS4.COM, Inc.
  4259. It is essential to remember this, since it has some impact on the C
  4260. code for the initialization procedures:
  4261. * Initialized global data (data segment) is read-only. Do not attempt
  4262. to write it.
  4263. * Do not use any uninitialized global data (or implicitely initialized
  4264. as zero data - BSS segment) at all - this is undefined, initiali-
  4265. zation is performed later (when relocating to RAM).
  4266. * Stack space is very limited. Avoid big data buffers or things like
  4267. that.
  4268. Having only the stack as writable memory limits means we cannot use
  4269. normal global data to share information beween the code. But it
  4270. turned out that the implementation of U-Boot can be greatly
  4271. simplified by making a global data structure (gd_t) available to all
  4272. functions. We could pass a pointer to this data as argument to _all_
  4273. functions, but this would bloat the code. Instead we use a feature of
  4274. the GCC compiler (Global Register Variables) to share the data: we
  4275. place a pointer (gd) to the global data into a register which we
  4276. reserve for this purpose.
  4277. When choosing a register for such a purpose we are restricted by the
  4278. relevant (E)ABI specifications for the current architecture, and by
  4279. GCC's implementation.
  4280. For PowerPC, the following registers have specific use:
  4281. R1: stack pointer
  4282. R2: reserved for system use
  4283. R3-R4: parameter passing and return values
  4284. R5-R10: parameter passing
  4285. R13: small data area pointer
  4286. R30: GOT pointer
  4287. R31: frame pointer
  4288. (U-Boot also uses R12 as internal GOT pointer. r12
  4289. is a volatile register so r12 needs to be reset when
  4290. going back and forth between asm and C)
  4291. ==> U-Boot will use R2 to hold a pointer to the global data
  4292. Note: on PPC, we could use a static initializer (since the
  4293. address of the global data structure is known at compile time),
  4294. but it turned out that reserving a register results in somewhat
  4295. smaller code - although the code savings are not that big (on
  4296. average for all boards 752 bytes for the whole U-Boot image,
  4297. 624 text + 127 data).
  4298. On Blackfin, the normal C ABI (except for P3) is followed as documented here:
  4299. http://docs.blackfin.uclinux.org/doku.php?id=application_binary_interface
  4300. ==> U-Boot will use P3 to hold a pointer to the global data
  4301. On ARM, the following registers are used:
  4302. R0: function argument word/integer result
  4303. R1-R3: function argument word
  4304. R9: GOT pointer
  4305. R10: stack limit (used only if stack checking if enabled)
  4306. R11: argument (frame) pointer
  4307. R12: temporary workspace
  4308. R13: stack pointer
  4309. R14: link register
  4310. R15: program counter
  4311. ==> U-Boot will use R8 to hold a pointer to the global data
  4312. On Nios II, the ABI is documented here:
  4313. http://www.altera.com/literature/hb/nios2/n2cpu_nii51016.pdf
  4314. ==> U-Boot will use gp to hold a pointer to the global data
  4315. Note: on Nios II, we give "-G0" option to gcc and don't use gp
  4316. to access small data sections, so gp is free.
  4317. On NDS32, the following registers are used:
  4318. R0-R1: argument/return
  4319. R2-R5: argument
  4320. R15: temporary register for assembler
  4321. R16: trampoline register
  4322. R28: frame pointer (FP)
  4323. R29: global pointer (GP)
  4324. R30: link register (LP)
  4325. R31: stack pointer (SP)
  4326. PC: program counter (PC)
  4327. ==> U-Boot will use R10 to hold a pointer to the global data
  4328. NOTE: DECLARE_GLOBAL_DATA_PTR must be used with file-global scope,
  4329. or current versions of GCC may "optimize" the code too much.
  4330. Memory Management:
  4331. ------------------
  4332. U-Boot runs in system state and uses physical addresses, i.e. the
  4333. MMU is not used either for address mapping nor for memory protection.
  4334. The available memory is mapped to fixed addresses using the memory
  4335. controller. In this process, a contiguous block is formed for each
  4336. memory type (Flash, SDRAM, SRAM), even when it consists of several
  4337. physical memory banks.
  4338. U-Boot is installed in the first 128 kB of the first Flash bank (on
  4339. TQM8xxL modules this is the range 0x40000000 ... 0x4001FFFF). After
  4340. booting and sizing and initializing DRAM, the code relocates itself
  4341. to the upper end of DRAM. Immediately below the U-Boot code some
  4342. memory is reserved for use by malloc() [see CONFIG_SYS_MALLOC_LEN
  4343. configuration setting]. Below that, a structure with global Board
  4344. Info data is placed, followed by the stack (growing downward).
  4345. Additionally, some exception handler code is copied to the low 8 kB
  4346. of DRAM (0x00000000 ... 0x00001FFF).
  4347. So a typical memory configuration with 16 MB of DRAM could look like
  4348. this:
  4349. 0x0000 0000 Exception Vector code
  4350. :
  4351. 0x0000 1FFF
  4352. 0x0000 2000 Free for Application Use
  4353. :
  4354. :
  4355. :
  4356. :
  4357. 0x00FB FF20 Monitor Stack (Growing downward)
  4358. 0x00FB FFAC Board Info Data and permanent copy of global data
  4359. 0x00FC 0000 Malloc Arena
  4360. :
  4361. 0x00FD FFFF
  4362. 0x00FE 0000 RAM Copy of Monitor Code
  4363. ... eventually: LCD or video framebuffer
  4364. ... eventually: pRAM (Protected RAM - unchanged by reset)
  4365. 0x00FF FFFF [End of RAM]
  4366. System Initialization:
  4367. ----------------------
  4368. In the reset configuration, U-Boot starts at the reset entry point
  4369. (on most PowerPC systems at address 0x00000100). Because of the reset
  4370. configuration for CS0# this is a mirror of the onboard Flash memory.
  4371. To be able to re-map memory U-Boot then jumps to its link address.
  4372. To be able to implement the initialization code in C, a (small!)
  4373. initial stack is set up in the internal Dual Ported RAM (in case CPUs
  4374. which provide such a feature like MPC8xx or MPC8260), or in a locked
  4375. part of the data cache. After that, U-Boot initializes the CPU core,
  4376. the caches and the SIU.
  4377. Next, all (potentially) available memory banks are mapped using a
  4378. preliminary mapping. For example, we put them on 512 MB boundaries
  4379. (multiples of 0x20000000: SDRAM on 0x00000000 and 0x20000000, Flash
  4380. on 0x40000000 and 0x60000000, SRAM on 0x80000000). Then UPM A is
  4381. programmed for SDRAM access. Using the temporary configuration, a
  4382. simple memory test is run that determines the size of the SDRAM
  4383. banks.
  4384. When there is more than one SDRAM bank, and the banks are of
  4385. different size, the largest is mapped first. For equal size, the first
  4386. bank (CS2#) is mapped first. The first mapping is always for address
  4387. 0x00000000, with any additional banks following immediately to create
  4388. contiguous memory starting from 0.
  4389. Then, the monitor installs itself at the upper end of the SDRAM area
  4390. and allocates memory for use by malloc() and for the global Board
  4391. Info data; also, the exception vector code is copied to the low RAM
  4392. pages, and the final stack is set up.
  4393. Only after this relocation will you have a "normal" C environment;
  4394. until that you are restricted in several ways, mostly because you are
  4395. running from ROM, and because the code will have to be relocated to a
  4396. new address in RAM.
  4397. U-Boot Porting Guide:
  4398. ----------------------
  4399. [Based on messages by Jerry Van Baren in the U-Boot-Users mailing
  4400. list, October 2002]
  4401. int main(int argc, char *argv[])
  4402. {
  4403. sighandler_t no_more_time;
  4404. signal(SIGALRM, no_more_time);
  4405. alarm(PROJECT_DEADLINE - toSec (3 * WEEK));
  4406. if (available_money > available_manpower) {
  4407. Pay consultant to port U-Boot;
  4408. return 0;
  4409. }
  4410. Download latest U-Boot source;
  4411. Subscribe to u-boot mailing list;
  4412. if (clueless)
  4413. email("Hi, I am new to U-Boot, how do I get started?");
  4414. while (learning) {
  4415. Read the README file in the top level directory;
  4416. Read http://www.denx.de/twiki/bin/view/DULG/Manual;
  4417. Read applicable doc/*.README;
  4418. Read the source, Luke;
  4419. /* find . -name "*.[chS]" | xargs grep -i <keyword> */
  4420. }
  4421. if (available_money > toLocalCurrency ($2500))
  4422. Buy a BDI3000;
  4423. else
  4424. Add a lot of aggravation and time;
  4425. if (a similar board exists) { /* hopefully... */
  4426. cp -a board/<similar> board/<myboard>
  4427. cp include/configs/<similar>.h include/configs/<myboard>.h
  4428. } else {
  4429. Create your own board support subdirectory;
  4430. Create your own board include/configs/<myboard>.h file;
  4431. }
  4432. Edit new board/<myboard> files
  4433. Edit new include/configs/<myboard>.h
  4434. while (!accepted) {
  4435. while (!running) {
  4436. do {
  4437. Add / modify source code;
  4438. } until (compiles);
  4439. Debug;
  4440. if (clueless)
  4441. email("Hi, I am having problems...");
  4442. }
  4443. Send patch file to the U-Boot email list;
  4444. if (reasonable critiques)
  4445. Incorporate improvements from email list code review;
  4446. else
  4447. Defend code as written;
  4448. }
  4449. return 0;
  4450. }
  4451. void no_more_time (int sig)
  4452. {
  4453. hire_a_guru();
  4454. }
  4455. Coding Standards:
  4456. -----------------
  4457. All contributions to U-Boot should conform to the Linux kernel
  4458. coding style; see the file "Documentation/CodingStyle" and the script
  4459. "scripts/Lindent" in your Linux kernel source directory.
  4460. Source files originating from a different project (for example the
  4461. MTD subsystem) are generally exempt from these guidelines and are not
  4462. reformated to ease subsequent migration to newer versions of those
  4463. sources.
  4464. Please note that U-Boot is implemented in C (and to some small parts in
  4465. Assembler); no C++ is used, so please do not use C++ style comments (//)
  4466. in your code.
  4467. Please also stick to the following formatting rules:
  4468. - remove any trailing white space
  4469. - use TAB characters for indentation and vertical alignment, not spaces
  4470. - make sure NOT to use DOS '\r\n' line feeds
  4471. - do not add more than 2 consecutive empty lines to source files
  4472. - do not add trailing empty lines to source files
  4473. Submissions which do not conform to the standards may be returned
  4474. with a request to reformat the changes.
  4475. Submitting Patches:
  4476. -------------------
  4477. Since the number of patches for U-Boot is growing, we need to
  4478. establish some rules. Submissions which do not conform to these rules
  4479. may be rejected, even when they contain important and valuable stuff.
  4480. Please see http://www.denx.de/wiki/U-Boot/Patches for details.
  4481. Patches shall be sent to the u-boot mailing list <u-boot@lists.denx.de>;
  4482. see http://lists.denx.de/mailman/listinfo/u-boot
  4483. When you send a patch, please include the following information with
  4484. it:
  4485. * For bug fixes: a description of the bug and how your patch fixes
  4486. this bug. Please try to include a way of demonstrating that the
  4487. patch actually fixes something.
  4488. * For new features: a description of the feature and your
  4489. implementation.
  4490. * A CHANGELOG entry as plaintext (separate from the patch)
  4491. * For major contributions, your entry to the CREDITS file
  4492. * When you add support for a new board, don't forget to add a
  4493. maintainer e-mail address to the boards.cfg file, too.
  4494. * If your patch adds new configuration options, don't forget to
  4495. document these in the README file.
  4496. * The patch itself. If you are using git (which is *strongly*
  4497. recommended) you can easily generate the patch using the
  4498. "git format-patch". If you then use "git send-email" to send it to
  4499. the U-Boot mailing list, you will avoid most of the common problems
  4500. with some other mail clients.
  4501. If you cannot use git, use "diff -purN OLD NEW". If your version of
  4502. diff does not support these options, then get the latest version of
  4503. GNU diff.
  4504. The current directory when running this command shall be the parent
  4505. directory of the U-Boot source tree (i. e. please make sure that
  4506. your patch includes sufficient directory information for the
  4507. affected files).
  4508. We prefer patches as plain text. MIME attachments are discouraged,
  4509. and compressed attachments must not be used.
  4510. * If one logical set of modifications affects or creates several
  4511. files, all these changes shall be submitted in a SINGLE patch file.
  4512. * Changesets that contain different, unrelated modifications shall be
  4513. submitted as SEPARATE patches, one patch per changeset.
  4514. Notes:
  4515. * Before sending the patch, run the MAKEALL script on your patched
  4516. source tree and make sure that no errors or warnings are reported
  4517. for any of the boards.
  4518. * Keep your modifications to the necessary minimum: A patch
  4519. containing several unrelated changes or arbitrary reformats will be
  4520. returned with a request to re-formatting / split it.
  4521. * If you modify existing code, make sure that your new code does not
  4522. add to the memory footprint of the code ;-) Small is beautiful!
  4523. When adding new features, these should compile conditionally only
  4524. (using #ifdef), and the resulting code with the new feature
  4525. disabled must not need more memory than the old code without your
  4526. modification.
  4527. * Remember that there is a size limit of 100 kB per message on the
  4528. u-boot mailing list. Bigger patches will be moderated. If they are
  4529. reasonable and not too big, they will be acknowledged. But patches
  4530. bigger than the size limit should be avoided.