README 145 KB

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  1. #
  2. # (C) Copyright 2000 - 2009
  3. # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  4. #
  5. # See file CREDITS for list of people who contributed to this
  6. # project.
  7. #
  8. # This program is free software; you can redistribute it and/or
  9. # modify it under the terms of the GNU General Public License as
  10. # published by the Free Software Foundation; either version 2 of
  11. # the License, or (at your option) any later version.
  12. #
  13. # This program is distributed in the hope that it will be useful,
  14. # but WITHOUT ANY WARRANTY; without even the implied warranty of
  15. # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16. # GNU General Public License for more details.
  17. #
  18. # You should have received a copy of the GNU General Public License
  19. # along with this program; if not, write to the Free Software
  20. # Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21. # MA 02111-1307 USA
  22. #
  23. Summary:
  24. ========
  25. This directory contains the source code for U-Boot, a boot loader for
  26. Embedded boards based on PowerPC, ARM, MIPS and several other
  27. processors, which can be installed in a boot ROM and used to
  28. initialize and test the hardware or to download and run application
  29. code.
  30. The development of U-Boot is closely related to Linux: some parts of
  31. the source code originate in the Linux source tree, we have some
  32. header files in common, and special provision has been made to
  33. support booting of Linux images.
  34. Some attention has been paid to make this software easily
  35. configurable and extendable. For instance, all monitor commands are
  36. implemented with the same call interface, so that it's very easy to
  37. add new commands. Also, instead of permanently adding rarely used
  38. code (for instance hardware test utilities) to the monitor, you can
  39. load and run it dynamically.
  40. Status:
  41. =======
  42. In general, all boards for which a configuration option exists in the
  43. Makefile have been tested to some extent and can be considered
  44. "working". In fact, many of them are used in production systems.
  45. In case of problems see the CHANGELOG and CREDITS files to find out
  46. who contributed the specific port. The MAINTAINERS file lists board
  47. maintainers.
  48. Where to get help:
  49. ==================
  50. In case you have questions about, problems with or contributions for
  51. U-Boot you should send a message to the U-Boot mailing list at
  52. <u-boot@lists.denx.de>. There is also an archive of previous traffic
  53. on the mailing list - please search the archive before asking FAQ's.
  54. Please see http://lists.denx.de/pipermail/u-boot and
  55. http://dir.gmane.org/gmane.comp.boot-loaders.u-boot
  56. Where to get source code:
  57. =========================
  58. The U-Boot source code is maintained in the git repository at
  59. git://www.denx.de/git/u-boot.git ; you can browse it online at
  60. http://www.denx.de/cgi-bin/gitweb.cgi?p=u-boot.git;a=summary
  61. The "snapshot" links on this page allow you to download tarballs of
  62. any version you might be interested in. Official releases are also
  63. available for FTP download from the ftp://ftp.denx.de/pub/u-boot/
  64. directory.
  65. Pre-built (and tested) images are available from
  66. ftp://ftp.denx.de/pub/u-boot/images/
  67. Where we come from:
  68. ===================
  69. - start from 8xxrom sources
  70. - create PPCBoot project (http://sourceforge.net/projects/ppcboot)
  71. - clean up code
  72. - make it easier to add custom boards
  73. - make it possible to add other [PowerPC] CPUs
  74. - extend functions, especially:
  75. * Provide extended interface to Linux boot loader
  76. * S-Record download
  77. * network boot
  78. * PCMCIA / CompactFlash / ATA disk / SCSI ... boot
  79. - create ARMBoot project (http://sourceforge.net/projects/armboot)
  80. - add other CPU families (starting with ARM)
  81. - create U-Boot project (http://sourceforge.net/projects/u-boot)
  82. - current project page: see http://www.denx.de/wiki/U-Boot
  83. Names and Spelling:
  84. ===================
  85. The "official" name of this project is "Das U-Boot". The spelling
  86. "U-Boot" shall be used in all written text (documentation, comments
  87. in source files etc.). Example:
  88. This is the README file for the U-Boot project.
  89. File names etc. shall be based on the string "u-boot". Examples:
  90. include/asm-ppc/u-boot.h
  91. #include <asm/u-boot.h>
  92. Variable names, preprocessor constants etc. shall be either based on
  93. the string "u_boot" or on "U_BOOT". Example:
  94. U_BOOT_VERSION u_boot_logo
  95. IH_OS_U_BOOT u_boot_hush_start
  96. Versioning:
  97. ===========
  98. U-Boot uses a 3 level version number containing a version, a
  99. sub-version, and a patchlevel: "U-Boot-2.34.5" means version "2",
  100. sub-version "34", and patchlevel "4".
  101. The patchlevel is used to indicate certain stages of development
  102. between released versions, i. e. officially released versions of
  103. U-Boot will always have a patchlevel of "0".
  104. Directory Hierarchy:
  105. ====================
  106. /arch Architecture specific files
  107. /arm Files generic to ARM architecture
  108. /cpu CPU specific files
  109. /arm720t Files specific to ARM 720 CPUs
  110. /arm920t Files specific to ARM 920 CPUs
  111. /at91rm9200 Files specific to Atmel AT91RM9200 CPU
  112. /imx Files specific to Freescale MC9328 i.MX CPUs
  113. /s3c24x0 Files specific to Samsung S3C24X0 CPUs
  114. /arm925t Files specific to ARM 925 CPUs
  115. /arm926ejs Files specific to ARM 926 CPUs
  116. /arm1136 Files specific to ARM 1136 CPUs
  117. /ixp Files specific to Intel XScale IXP CPUs
  118. /pxa Files specific to Intel XScale PXA CPUs
  119. /s3c44b0 Files specific to Samsung S3C44B0 CPUs
  120. /sa1100 Files specific to Intel StrongARM SA1100 CPUs
  121. /lib Architecture specific library files
  122. /avr32 Files generic to AVR32 architecture
  123. /cpu CPU specific files
  124. /lib Architecture specific library files
  125. /blackfin Files generic to Analog Devices Blackfin architecture
  126. /cpu CPU specific files
  127. /lib Architecture specific library files
  128. /i386 Files generic to i386 architecture
  129. /cpu CPU specific files
  130. /lib Architecture specific library files
  131. /m68k Files generic to m68k architecture
  132. /cpu CPU specific files
  133. /mcf52x2 Files specific to Freescale ColdFire MCF52x2 CPUs
  134. /mcf5227x Files specific to Freescale ColdFire MCF5227x CPUs
  135. /mcf532x Files specific to Freescale ColdFire MCF5329 CPUs
  136. /mcf5445x Files specific to Freescale ColdFire MCF5445x CPUs
  137. /mcf547x_8x Files specific to Freescale ColdFire MCF547x_8x CPUs
  138. /lib Architecture specific library files
  139. /microblaze Files generic to microblaze architecture
  140. /cpu CPU specific files
  141. /lib Architecture specific library files
  142. /mips Files generic to MIPS architecture
  143. /cpu CPU specific files
  144. /lib Architecture specific library files
  145. /nios Files generic to Altera NIOS architecture
  146. /cpu CPU specific files
  147. /lib Architecture specific library files
  148. /nios2 Files generic to Altera NIOS2 architecture
  149. /cpu CPU specific files
  150. /lib Architecture specific library files
  151. /powerpc Files generic to PowerPC architecture
  152. /cpu CPU specific files
  153. /74xx_7xx Files specific to Freescale MPC74xx and 7xx CPUs
  154. /mpc5xx Files specific to Freescale MPC5xx CPUs
  155. /mpc5xxx Files specific to Freescale MPC5xxx CPUs
  156. /mpc8xx Files specific to Freescale MPC8xx CPUs
  157. /mpc8220 Files specific to Freescale MPC8220 CPUs
  158. /mpc824x Files specific to Freescale MPC824x CPUs
  159. /mpc8260 Files specific to Freescale MPC8260 CPUs
  160. /mpc85xx Files specific to Freescale MPC85xx CPUs
  161. /ppc4xx Files specific to AMCC PowerPC 4xx CPUs
  162. /lib Architecture specific library files
  163. /sh Files generic to SH architecture
  164. /cpu CPU specific files
  165. /sh2 Files specific to sh2 CPUs
  166. /sh3 Files specific to sh3 CPUs
  167. /sh4 Files specific to sh4 CPUs
  168. /lib Architecture specific library files
  169. /sparc Files generic to SPARC architecture
  170. /cpu CPU specific files
  171. /leon2 Files specific to Gaisler LEON2 SPARC CPU
  172. /leon3 Files specific to Gaisler LEON3 SPARC CPU
  173. /lib Architecture specific library files
  174. /api Machine/arch independent API for external apps
  175. /board Board dependent files
  176. /common Misc architecture independent functions
  177. /disk Code for disk drive partition handling
  178. /doc Documentation (don't expect too much)
  179. /drivers Commonly used device drivers
  180. /examples Example code for standalone applications, etc.
  181. /fs Filesystem code (cramfs, ext2, jffs2, etc.)
  182. /include Header Files
  183. /lib Files generic to all architectures
  184. /libfdt Library files to support flattened device trees
  185. /lzma Library files to support LZMA decompression
  186. /lzo Library files to support LZO decompression
  187. /net Networking code
  188. /post Power On Self Test
  189. /rtc Real Time Clock drivers
  190. /tools Tools to build S-Record or U-Boot images, etc.
  191. Software Configuration:
  192. =======================
  193. Configuration is usually done using C preprocessor defines; the
  194. rationale behind that is to avoid dead code whenever possible.
  195. There are two classes of configuration variables:
  196. * Configuration _OPTIONS_:
  197. These are selectable by the user and have names beginning with
  198. "CONFIG_".
  199. * Configuration _SETTINGS_:
  200. These depend on the hardware etc. and should not be meddled with if
  201. you don't know what you're doing; they have names beginning with
  202. "CONFIG_SYS_".
  203. Later we will add a configuration tool - probably similar to or even
  204. identical to what's used for the Linux kernel. Right now, we have to
  205. do the configuration by hand, which means creating some symbolic
  206. links and editing some configuration files. We use the TQM8xxL boards
  207. as an example here.
  208. Selection of Processor Architecture and Board Type:
  209. ---------------------------------------------------
  210. For all supported boards there are ready-to-use default
  211. configurations available; just type "make <board_name>_config".
  212. Example: For a TQM823L module type:
  213. cd u-boot
  214. make TQM823L_config
  215. For the Cogent platform, you need to specify the CPU type as well;
  216. e.g. "make cogent_mpc8xx_config". And also configure the cogent
  217. directory according to the instructions in cogent/README.
  218. Configuration Options:
  219. ----------------------
  220. Configuration depends on the combination of board and CPU type; all
  221. such information is kept in a configuration file
  222. "include/configs/<board_name>.h".
  223. Example: For a TQM823L module, all configuration settings are in
  224. "include/configs/TQM823L.h".
  225. Many of the options are named exactly as the corresponding Linux
  226. kernel configuration options. The intention is to make it easier to
  227. build a config tool - later.
  228. The following options need to be configured:
  229. - CPU Type: Define exactly one, e.g. CONFIG_MPC85XX.
  230. - Board Type: Define exactly one, e.g. CONFIG_MPC8540ADS.
  231. - CPU Daughterboard Type: (if CONFIG_ATSTK1000 is defined)
  232. Define exactly one, e.g. CONFIG_ATSTK1002
  233. - CPU Module Type: (if CONFIG_COGENT is defined)
  234. Define exactly one of
  235. CONFIG_CMA286_60_OLD
  236. --- FIXME --- not tested yet:
  237. CONFIG_CMA286_60, CONFIG_CMA286_21, CONFIG_CMA286_60P,
  238. CONFIG_CMA287_23, CONFIG_CMA287_50
  239. - Motherboard Type: (if CONFIG_COGENT is defined)
  240. Define exactly one of
  241. CONFIG_CMA101, CONFIG_CMA102
  242. - Motherboard I/O Modules: (if CONFIG_COGENT is defined)
  243. Define one or more of
  244. CONFIG_CMA302
  245. - Motherboard Options: (if CONFIG_CMA101 or CONFIG_CMA102 are defined)
  246. Define one or more of
  247. CONFIG_LCD_HEARTBEAT - update a character position on
  248. the LCD display every second with
  249. a "rotator" |\-/|\-/
  250. - Board flavour: (if CONFIG_MPC8260ADS is defined)
  251. CONFIG_ADSTYPE
  252. Possible values are:
  253. CONFIG_SYS_8260ADS - original MPC8260ADS
  254. CONFIG_SYS_8266ADS - MPC8266ADS
  255. CONFIG_SYS_PQ2FADS - PQ2FADS-ZU or PQ2FADS-VR
  256. CONFIG_SYS_8272ADS - MPC8272ADS
  257. - MPC824X Family Member (if CONFIG_MPC824X is defined)
  258. Define exactly one of
  259. CONFIG_MPC8240, CONFIG_MPC8245
  260. - 8xx CPU Options: (if using an MPC8xx CPU)
  261. CONFIG_8xx_GCLK_FREQ - deprecated: CPU clock if
  262. get_gclk_freq() cannot work
  263. e.g. if there is no 32KHz
  264. reference PIT/RTC clock
  265. CONFIG_8xx_OSCLK - PLL input clock (either EXTCLK
  266. or XTAL/EXTAL)
  267. - 859/866/885 CPU options: (if using a MPC859 or MPC866 or MPC885 CPU):
  268. CONFIG_SYS_8xx_CPUCLK_MIN
  269. CONFIG_SYS_8xx_CPUCLK_MAX
  270. CONFIG_8xx_CPUCLK_DEFAULT
  271. See doc/README.MPC866
  272. CONFIG_SYS_MEASURE_CPUCLK
  273. Define this to measure the actual CPU clock instead
  274. of relying on the correctness of the configured
  275. values. Mostly useful for board bringup to make sure
  276. the PLL is locked at the intended frequency. Note
  277. that this requires a (stable) reference clock (32 kHz
  278. RTC clock or CONFIG_SYS_8XX_XIN)
  279. CONFIG_SYS_DELAYED_ICACHE
  280. Define this option if you want to enable the
  281. ICache only when Code runs from RAM.
  282. - Intel Monahans options:
  283. CONFIG_SYS_MONAHANS_RUN_MODE_OSC_RATIO
  284. Defines the Monahans run mode to oscillator
  285. ratio. Valid values are 8, 16, 24, 31. The core
  286. frequency is this value multiplied by 13 MHz.
  287. CONFIG_SYS_MONAHANS_TURBO_RUN_MODE_RATIO
  288. Defines the Monahans turbo mode to oscillator
  289. ratio. Valid values are 1 (default if undefined) and
  290. 2. The core frequency as calculated above is multiplied
  291. by this value.
  292. - Linux Kernel Interface:
  293. CONFIG_CLOCKS_IN_MHZ
  294. U-Boot stores all clock information in Hz
  295. internally. For binary compatibility with older Linux
  296. kernels (which expect the clocks passed in the
  297. bd_info data to be in MHz) the environment variable
  298. "clocks_in_mhz" can be defined so that U-Boot
  299. converts clock data to MHZ before passing it to the
  300. Linux kernel.
  301. When CONFIG_CLOCKS_IN_MHZ is defined, a definition of
  302. "clocks_in_mhz=1" is automatically included in the
  303. default environment.
  304. CONFIG_MEMSIZE_IN_BYTES [relevant for MIPS only]
  305. When transferring memsize parameter to linux, some versions
  306. expect it to be in bytes, others in MB.
  307. Define CONFIG_MEMSIZE_IN_BYTES to make it in bytes.
  308. CONFIG_OF_LIBFDT
  309. New kernel versions are expecting firmware settings to be
  310. passed using flattened device trees (based on open firmware
  311. concepts).
  312. CONFIG_OF_LIBFDT
  313. * New libfdt-based support
  314. * Adds the "fdt" command
  315. * The bootm command automatically updates the fdt
  316. OF_CPU - The proper name of the cpus node (only required for
  317. MPC512X and MPC5xxx based boards).
  318. OF_SOC - The proper name of the soc node (only required for
  319. MPC512X and MPC5xxx based boards).
  320. OF_TBCLK - The timebase frequency.
  321. OF_STDOUT_PATH - The path to the console device
  322. boards with QUICC Engines require OF_QE to set UCC MAC
  323. addresses
  324. CONFIG_OF_BOARD_SETUP
  325. Board code has addition modification that it wants to make
  326. to the flat device tree before handing it off to the kernel
  327. CONFIG_OF_BOOT_CPU
  328. This define fills in the correct boot CPU in the boot
  329. param header, the default value is zero if undefined.
  330. CONFIG_OF_IDE_FIXUP
  331. U-Boot can detect if an IDE device is present or not.
  332. If not, and this new config option is activated, U-Boot
  333. removes the ATA node from the DTS before booting Linux,
  334. so the Linux IDE driver does not probe the device and
  335. crash. This is needed for buggy hardware (uc101) where
  336. no pull down resistor is connected to the signal IDE5V_DD7.
  337. - vxWorks boot parameters:
  338. bootvx constructs a valid bootline using the following
  339. environments variables: bootfile, ipaddr, serverip, hostname.
  340. It loads the vxWorks image pointed bootfile.
  341. CONFIG_SYS_VXWORKS_BOOT_DEVICE - The vxworks device name
  342. CONFIG_SYS_VXWORKS_MAC_PTR - Ethernet 6 byte MA -address
  343. CONFIG_SYS_VXWORKS_SERVERNAME - Name of the server
  344. CONFIG_SYS_VXWORKS_BOOT_ADDR - Address of boot parameters
  345. CONFIG_SYS_VXWORKS_ADD_PARAMS
  346. Add it at the end of the bootline. E.g "u=username pw=secret"
  347. Note: If a "bootargs" environment is defined, it will overwride
  348. the defaults discussed just above.
  349. - Serial Ports:
  350. CONFIG_PL010_SERIAL
  351. Define this if you want support for Amba PrimeCell PL010 UARTs.
  352. CONFIG_PL011_SERIAL
  353. Define this if you want support for Amba PrimeCell PL011 UARTs.
  354. CONFIG_PL011_CLOCK
  355. If you have Amba PrimeCell PL011 UARTs, set this variable to
  356. the clock speed of the UARTs.
  357. CONFIG_PL01x_PORTS
  358. If you have Amba PrimeCell PL010 or PL011 UARTs on your board,
  359. define this to a list of base addresses for each (supported)
  360. port. See e.g. include/configs/versatile.h
  361. - Console Interface:
  362. Depending on board, define exactly one serial port
  363. (like CONFIG_8xx_CONS_SMC1, CONFIG_8xx_CONS_SMC2,
  364. CONFIG_8xx_CONS_SCC1, ...), or switch off the serial
  365. console by defining CONFIG_8xx_CONS_NONE
  366. Note: if CONFIG_8xx_CONS_NONE is defined, the serial
  367. port routines must be defined elsewhere
  368. (i.e. serial_init(), serial_getc(), ...)
  369. CONFIG_CFB_CONSOLE
  370. Enables console device for a color framebuffer. Needs following
  371. defines (cf. smiLynxEM, i8042, board/eltec/bab7xx)
  372. VIDEO_FB_LITTLE_ENDIAN graphic memory organisation
  373. (default big endian)
  374. VIDEO_HW_RECTFILL graphic chip supports
  375. rectangle fill
  376. (cf. smiLynxEM)
  377. VIDEO_HW_BITBLT graphic chip supports
  378. bit-blit (cf. smiLynxEM)
  379. VIDEO_VISIBLE_COLS visible pixel columns
  380. (cols=pitch)
  381. VIDEO_VISIBLE_ROWS visible pixel rows
  382. VIDEO_PIXEL_SIZE bytes per pixel
  383. VIDEO_DATA_FORMAT graphic data format
  384. (0-5, cf. cfb_console.c)
  385. VIDEO_FB_ADRS framebuffer address
  386. VIDEO_KBD_INIT_FCT keyboard int fct
  387. (i.e. i8042_kbd_init())
  388. VIDEO_TSTC_FCT test char fct
  389. (i.e. i8042_tstc)
  390. VIDEO_GETC_FCT get char fct
  391. (i.e. i8042_getc)
  392. CONFIG_CONSOLE_CURSOR cursor drawing on/off
  393. (requires blink timer
  394. cf. i8042.c)
  395. CONFIG_SYS_CONSOLE_BLINK_COUNT blink interval (cf. i8042.c)
  396. CONFIG_CONSOLE_TIME display time/date info in
  397. upper right corner
  398. (requires CONFIG_CMD_DATE)
  399. CONFIG_VIDEO_LOGO display Linux logo in
  400. upper left corner
  401. CONFIG_VIDEO_BMP_LOGO use bmp_logo.h instead of
  402. linux_logo.h for logo.
  403. Requires CONFIG_VIDEO_LOGO
  404. CONFIG_CONSOLE_EXTRA_INFO
  405. additional board info beside
  406. the logo
  407. When CONFIG_CFB_CONSOLE is defined, video console is
  408. default i/o. Serial console can be forced with
  409. environment 'console=serial'.
  410. When CONFIG_SILENT_CONSOLE is defined, all console
  411. messages (by U-Boot and Linux!) can be silenced with
  412. the "silent" environment variable. See
  413. doc/README.silent for more information.
  414. - Console Baudrate:
  415. CONFIG_BAUDRATE - in bps
  416. Select one of the baudrates listed in
  417. CONFIG_SYS_BAUDRATE_TABLE, see below.
  418. CONFIG_SYS_BRGCLK_PRESCALE, baudrate prescale
  419. - Console Rx buffer length
  420. With CONFIG_SYS_SMC_RXBUFLEN it is possible to define
  421. the maximum receive buffer length for the SMC.
  422. This option is actual only for 82xx and 8xx possible.
  423. If using CONFIG_SYS_SMC_RXBUFLEN also CONFIG_SYS_MAXIDLE
  424. must be defined, to setup the maximum idle timeout for
  425. the SMC.
  426. - Interrupt driven serial port input:
  427. CONFIG_SERIAL_SOFTWARE_FIFO
  428. PPC405GP only.
  429. Use an interrupt handler for receiving data on the
  430. serial port. It also enables using hardware handshake
  431. (RTS/CTS) and UART's built-in FIFO. Set the number of
  432. bytes the interrupt driven input buffer should have.
  433. Leave undefined to disable this feature, including
  434. disable the buffer and hardware handshake.
  435. - Console UART Number:
  436. CONFIG_UART1_CONSOLE
  437. AMCC PPC4xx only.
  438. If defined internal UART1 (and not UART0) is used
  439. as default U-Boot console.
  440. - Boot Delay: CONFIG_BOOTDELAY - in seconds
  441. Delay before automatically booting the default image;
  442. set to -1 to disable autoboot.
  443. See doc/README.autoboot for these options that
  444. work with CONFIG_BOOTDELAY. None are required.
  445. CONFIG_BOOT_RETRY_TIME
  446. CONFIG_BOOT_RETRY_MIN
  447. CONFIG_AUTOBOOT_KEYED
  448. CONFIG_AUTOBOOT_PROMPT
  449. CONFIG_AUTOBOOT_DELAY_STR
  450. CONFIG_AUTOBOOT_STOP_STR
  451. CONFIG_AUTOBOOT_DELAY_STR2
  452. CONFIG_AUTOBOOT_STOP_STR2
  453. CONFIG_ZERO_BOOTDELAY_CHECK
  454. CONFIG_RESET_TO_RETRY
  455. - Autoboot Command:
  456. CONFIG_BOOTCOMMAND
  457. Only needed when CONFIG_BOOTDELAY is enabled;
  458. define a command string that is automatically executed
  459. when no character is read on the console interface
  460. within "Boot Delay" after reset.
  461. CONFIG_BOOTARGS
  462. This can be used to pass arguments to the bootm
  463. command. The value of CONFIG_BOOTARGS goes into the
  464. environment value "bootargs".
  465. CONFIG_RAMBOOT and CONFIG_NFSBOOT
  466. The value of these goes into the environment as
  467. "ramboot" and "nfsboot" respectively, and can be used
  468. as a convenience, when switching between booting from
  469. RAM and NFS.
  470. - Pre-Boot Commands:
  471. CONFIG_PREBOOT
  472. When this option is #defined, the existence of the
  473. environment variable "preboot" will be checked
  474. immediately before starting the CONFIG_BOOTDELAY
  475. countdown and/or running the auto-boot command resp.
  476. entering interactive mode.
  477. This feature is especially useful when "preboot" is
  478. automatically generated or modified. For an example
  479. see the LWMON board specific code: here "preboot" is
  480. modified when the user holds down a certain
  481. combination of keys on the (special) keyboard when
  482. booting the systems
  483. - Serial Download Echo Mode:
  484. CONFIG_LOADS_ECHO
  485. If defined to 1, all characters received during a
  486. serial download (using the "loads" command) are
  487. echoed back. This might be needed by some terminal
  488. emulations (like "cu"), but may as well just take
  489. time on others. This setting #define's the initial
  490. value of the "loads_echo" environment variable.
  491. - Kgdb Serial Baudrate: (if CONFIG_CMD_KGDB is defined)
  492. CONFIG_KGDB_BAUDRATE
  493. Select one of the baudrates listed in
  494. CONFIG_SYS_BAUDRATE_TABLE, see below.
  495. - Monitor Functions:
  496. Monitor commands can be included or excluded
  497. from the build by using the #include files
  498. "config_cmd_all.h" and #undef'ing unwanted
  499. commands, or using "config_cmd_default.h"
  500. and augmenting with additional #define's
  501. for wanted commands.
  502. The default command configuration includes all commands
  503. except those marked below with a "*".
  504. CONFIG_CMD_ASKENV * ask for env variable
  505. CONFIG_CMD_BDI bdinfo
  506. CONFIG_CMD_BEDBUG * Include BedBug Debugger
  507. CONFIG_CMD_BMP * BMP support
  508. CONFIG_CMD_BSP * Board specific commands
  509. CONFIG_CMD_BOOTD bootd
  510. CONFIG_CMD_CACHE * icache, dcache
  511. CONFIG_CMD_CONSOLE coninfo
  512. CONFIG_CMD_DATE * support for RTC, date/time...
  513. CONFIG_CMD_DHCP * DHCP support
  514. CONFIG_CMD_DIAG * Diagnostics
  515. CONFIG_CMD_DS4510 * ds4510 I2C gpio commands
  516. CONFIG_CMD_DS4510_INFO * ds4510 I2C info command
  517. CONFIG_CMD_DS4510_MEM * ds4510 I2C eeprom/sram commansd
  518. CONFIG_CMD_DS4510_RST * ds4510 I2C rst command
  519. CONFIG_CMD_DTT * Digital Therm and Thermostat
  520. CONFIG_CMD_ECHO echo arguments
  521. CONFIG_CMD_EDITENV edit env variable
  522. CONFIG_CMD_EEPROM * EEPROM read/write support
  523. CONFIG_CMD_ELF * bootelf, bootvx
  524. CONFIG_CMD_SAVEENV saveenv
  525. CONFIG_CMD_FDC * Floppy Disk Support
  526. CONFIG_CMD_FAT * FAT partition support
  527. CONFIG_CMD_FDOS * Dos diskette Support
  528. CONFIG_CMD_FLASH flinfo, erase, protect
  529. CONFIG_CMD_FPGA FPGA device initialization support
  530. CONFIG_CMD_HWFLOW * RTS/CTS hw flow control
  531. CONFIG_CMD_I2C * I2C serial bus support
  532. CONFIG_CMD_IDE * IDE harddisk support
  533. CONFIG_CMD_IMI iminfo
  534. CONFIG_CMD_IMLS List all found images
  535. CONFIG_CMD_IMMAP * IMMR dump support
  536. CONFIG_CMD_IRQ * irqinfo
  537. CONFIG_CMD_ITEST Integer/string test of 2 values
  538. CONFIG_CMD_JFFS2 * JFFS2 Support
  539. CONFIG_CMD_KGDB * kgdb
  540. CONFIG_CMD_LOADB loadb
  541. CONFIG_CMD_LOADS loads
  542. CONFIG_CMD_MD5SUM print md5 message digest
  543. (requires CONFIG_CMD_MEMORY and CONFIG_MD5)
  544. CONFIG_CMD_MEMORY md, mm, nm, mw, cp, cmp, crc, base,
  545. loop, loopw, mtest
  546. CONFIG_CMD_MISC Misc functions like sleep etc
  547. CONFIG_CMD_MMC * MMC memory mapped support
  548. CONFIG_CMD_MII * MII utility commands
  549. CONFIG_CMD_MTDPARTS * MTD partition support
  550. CONFIG_CMD_NAND * NAND support
  551. CONFIG_CMD_NET bootp, tftpboot, rarpboot
  552. CONFIG_CMD_PCA953X * PCA953x I2C gpio commands
  553. CONFIG_CMD_PCA953X_INFO * PCA953x I2C gpio info command
  554. CONFIG_CMD_PCI * pciinfo
  555. CONFIG_CMD_PCMCIA * PCMCIA support
  556. CONFIG_CMD_PING * send ICMP ECHO_REQUEST to network
  557. host
  558. CONFIG_CMD_PORTIO * Port I/O
  559. CONFIG_CMD_REGINFO * Register dump
  560. CONFIG_CMD_RUN run command in env variable
  561. CONFIG_CMD_SAVES * save S record dump
  562. CONFIG_CMD_SCSI * SCSI Support
  563. CONFIG_CMD_SDRAM * print SDRAM configuration information
  564. (requires CONFIG_CMD_I2C)
  565. CONFIG_CMD_SETGETDCR Support for DCR Register access
  566. (4xx only)
  567. CONFIG_CMD_SHA1 print sha1 memory digest
  568. (requires CONFIG_CMD_MEMORY)
  569. CONFIG_CMD_SOURCE "source" command Support
  570. CONFIG_CMD_SPI * SPI serial bus support
  571. CONFIG_CMD_USB * USB support
  572. CONFIG_CMD_VFD * VFD support (TRAB)
  573. CONFIG_CMD_CDP * Cisco Discover Protocol support
  574. CONFIG_CMD_FSL * Microblaze FSL support
  575. EXAMPLE: If you want all functions except of network
  576. support you can write:
  577. #include "config_cmd_all.h"
  578. #undef CONFIG_CMD_NET
  579. Other Commands:
  580. fdt (flattened device tree) command: CONFIG_OF_LIBFDT
  581. Note: Don't enable the "icache" and "dcache" commands
  582. (configuration option CONFIG_CMD_CACHE) unless you know
  583. what you (and your U-Boot users) are doing. Data
  584. cache cannot be enabled on systems like the 8xx or
  585. 8260 (where accesses to the IMMR region must be
  586. uncached), and it cannot be disabled on all other
  587. systems where we (mis-) use the data cache to hold an
  588. initial stack and some data.
  589. XXX - this list needs to get updated!
  590. - Watchdog:
  591. CONFIG_WATCHDOG
  592. If this variable is defined, it enables watchdog
  593. support. There must be support in the platform specific
  594. code for a watchdog. For the 8xx and 8260 CPUs, the
  595. SIU Watchdog feature is enabled in the SYPCR
  596. register.
  597. - U-Boot Version:
  598. CONFIG_VERSION_VARIABLE
  599. If this variable is defined, an environment variable
  600. named "ver" is created by U-Boot showing the U-Boot
  601. version as printed by the "version" command.
  602. This variable is readonly.
  603. - Real-Time Clock:
  604. When CONFIG_CMD_DATE is selected, the type of the RTC
  605. has to be selected, too. Define exactly one of the
  606. following options:
  607. CONFIG_RTC_MPC8xx - use internal RTC of MPC8xx
  608. CONFIG_RTC_PCF8563 - use Philips PCF8563 RTC
  609. CONFIG_RTC_MC13783 - use MC13783 RTC
  610. CONFIG_RTC_MC146818 - use MC146818 RTC
  611. CONFIG_RTC_DS1307 - use Maxim, Inc. DS1307 RTC
  612. CONFIG_RTC_DS1337 - use Maxim, Inc. DS1337 RTC
  613. CONFIG_RTC_DS1338 - use Maxim, Inc. DS1338 RTC
  614. CONFIG_RTC_DS164x - use Dallas DS164x RTC
  615. CONFIG_RTC_ISL1208 - use Intersil ISL1208 RTC
  616. CONFIG_RTC_MAX6900 - use Maxim, Inc. MAX6900 RTC
  617. CONFIG_SYS_RTC_DS1337_NOOSC - Turn off the OSC output for DS1337
  618. Note that if the RTC uses I2C, then the I2C interface
  619. must also be configured. See I2C Support, below.
  620. - GPIO Support:
  621. CONFIG_PCA953X - use NXP's PCA953X series I2C GPIO
  622. CONFIG_PCA953X_INFO - enable pca953x info command
  623. Note that if the GPIO device uses I2C, then the I2C interface
  624. must also be configured. See I2C Support, below.
  625. - Timestamp Support:
  626. When CONFIG_TIMESTAMP is selected, the timestamp
  627. (date and time) of an image is printed by image
  628. commands like bootm or iminfo. This option is
  629. automatically enabled when you select CONFIG_CMD_DATE .
  630. - Partition Support:
  631. CONFIG_MAC_PARTITION and/or CONFIG_DOS_PARTITION
  632. and/or CONFIG_ISO_PARTITION and/or CONFIG_EFI_PARTITION
  633. If IDE or SCSI support is enabled (CONFIG_CMD_IDE or
  634. CONFIG_CMD_SCSI) you must configure support for at
  635. least one partition type as well.
  636. - IDE Reset method:
  637. CONFIG_IDE_RESET_ROUTINE - this is defined in several
  638. board configurations files but used nowhere!
  639. CONFIG_IDE_RESET - is this is defined, IDE Reset will
  640. be performed by calling the function
  641. ide_set_reset(int reset)
  642. which has to be defined in a board specific file
  643. - ATAPI Support:
  644. CONFIG_ATAPI
  645. Set this to enable ATAPI support.
  646. - LBA48 Support
  647. CONFIG_LBA48
  648. Set this to enable support for disks larger than 137GB
  649. Also look at CONFIG_SYS_64BIT_LBA.
  650. Whithout these , LBA48 support uses 32bit variables and will 'only'
  651. support disks up to 2.1TB.
  652. CONFIG_SYS_64BIT_LBA:
  653. When enabled, makes the IDE subsystem use 64bit sector addresses.
  654. Default is 32bit.
  655. - SCSI Support:
  656. At the moment only there is only support for the
  657. SYM53C8XX SCSI controller; define
  658. CONFIG_SCSI_SYM53C8XX to enable it.
  659. CONFIG_SYS_SCSI_MAX_LUN [8], CONFIG_SYS_SCSI_MAX_SCSI_ID [7] and
  660. CONFIG_SYS_SCSI_MAX_DEVICE [CONFIG_SYS_SCSI_MAX_SCSI_ID *
  661. CONFIG_SYS_SCSI_MAX_LUN] can be adjusted to define the
  662. maximum numbers of LUNs, SCSI ID's and target
  663. devices.
  664. CONFIG_SYS_SCSI_SYM53C8XX_CCF to fix clock timing (80Mhz)
  665. - NETWORK Support (PCI):
  666. CONFIG_E1000
  667. Support for Intel 8254x gigabit chips.
  668. CONFIG_E1000_FALLBACK_MAC
  669. default MAC for empty EEPROM after production.
  670. CONFIG_EEPRO100
  671. Support for Intel 82557/82559/82559ER chips.
  672. Optional CONFIG_EEPRO100_SROM_WRITE enables EEPROM
  673. write routine for first time initialisation.
  674. CONFIG_TULIP
  675. Support for Digital 2114x chips.
  676. Optional CONFIG_TULIP_SELECT_MEDIA for board specific
  677. modem chip initialisation (KS8761/QS6611).
  678. CONFIG_NATSEMI
  679. Support for National dp83815 chips.
  680. CONFIG_NS8382X
  681. Support for National dp8382[01] gigabit chips.
  682. - NETWORK Support (other):
  683. CONFIG_DRIVER_AT91EMAC
  684. Support for AT91RM9200 EMAC.
  685. CONFIG_RMII
  686. Define this to use reduced MII inteface
  687. CONFIG_DRIVER_AT91EMAC_QUIET
  688. If this defined, the driver is quiet.
  689. The driver doen't show link status messages.
  690. CONFIG_DRIVER_LAN91C96
  691. Support for SMSC's LAN91C96 chips.
  692. CONFIG_LAN91C96_BASE
  693. Define this to hold the physical address
  694. of the LAN91C96's I/O space
  695. CONFIG_LAN91C96_USE_32_BIT
  696. Define this to enable 32 bit addressing
  697. CONFIG_DRIVER_SMC91111
  698. Support for SMSC's LAN91C111 chip
  699. CONFIG_SMC91111_BASE
  700. Define this to hold the physical address
  701. of the device (I/O space)
  702. CONFIG_SMC_USE_32_BIT
  703. Define this if data bus is 32 bits
  704. CONFIG_SMC_USE_IOFUNCS
  705. Define this to use i/o functions instead of macros
  706. (some hardware wont work with macros)
  707. CONFIG_SMC911X
  708. Support for SMSC's LAN911x and LAN921x chips
  709. CONFIG_SMC911X_BASE
  710. Define this to hold the physical address
  711. of the device (I/O space)
  712. CONFIG_SMC911X_32_BIT
  713. Define this if data bus is 32 bits
  714. CONFIG_SMC911X_16_BIT
  715. Define this if data bus is 16 bits. If your processor
  716. automatically converts one 32 bit word to two 16 bit
  717. words you may also try CONFIG_SMC911X_32_BIT.
  718. - USB Support:
  719. At the moment only the UHCI host controller is
  720. supported (PIP405, MIP405, MPC5200); define
  721. CONFIG_USB_UHCI to enable it.
  722. define CONFIG_USB_KEYBOARD to enable the USB Keyboard
  723. and define CONFIG_USB_STORAGE to enable the USB
  724. storage devices.
  725. Note:
  726. Supported are USB Keyboards and USB Floppy drives
  727. (TEAC FD-05PUB).
  728. MPC5200 USB requires additional defines:
  729. CONFIG_USB_CLOCK
  730. for 528 MHz Clock: 0x0001bbbb
  731. CONFIG_PSC3_USB
  732. for USB on PSC3
  733. CONFIG_USB_CONFIG
  734. for differential drivers: 0x00001000
  735. for single ended drivers: 0x00005000
  736. for differential drivers on PSC3: 0x00000100
  737. for single ended drivers on PSC3: 0x00004100
  738. CONFIG_SYS_USB_EVENT_POLL
  739. May be defined to allow interrupt polling
  740. instead of using asynchronous interrupts
  741. - USB Device:
  742. Define the below if you wish to use the USB console.
  743. Once firmware is rebuilt from a serial console issue the
  744. command "setenv stdin usbtty; setenv stdout usbtty" and
  745. attach your USB cable. The Unix command "dmesg" should print
  746. it has found a new device. The environment variable usbtty
  747. can be set to gserial or cdc_acm to enable your device to
  748. appear to a USB host as a Linux gserial device or a
  749. Common Device Class Abstract Control Model serial device.
  750. If you select usbtty = gserial you should be able to enumerate
  751. a Linux host by
  752. # modprobe usbserial vendor=0xVendorID product=0xProductID
  753. else if using cdc_acm, simply setting the environment
  754. variable usbtty to be cdc_acm should suffice. The following
  755. might be defined in YourBoardName.h
  756. CONFIG_USB_DEVICE
  757. Define this to build a UDC device
  758. CONFIG_USB_TTY
  759. Define this to have a tty type of device available to
  760. talk to the UDC device
  761. CONFIG_SYS_CONSOLE_IS_IN_ENV
  762. Define this if you want stdin, stdout &/or stderr to
  763. be set to usbtty.
  764. mpc8xx:
  765. CONFIG_SYS_USB_EXTC_CLK 0xBLAH
  766. Derive USB clock from external clock "blah"
  767. - CONFIG_SYS_USB_EXTC_CLK 0x02
  768. CONFIG_SYS_USB_BRG_CLK 0xBLAH
  769. Derive USB clock from brgclk
  770. - CONFIG_SYS_USB_BRG_CLK 0x04
  771. If you have a USB-IF assigned VendorID then you may wish to
  772. define your own vendor specific values either in BoardName.h
  773. or directly in usbd_vendor_info.h. If you don't define
  774. CONFIG_USBD_MANUFACTURER, CONFIG_USBD_PRODUCT_NAME,
  775. CONFIG_USBD_VENDORID and CONFIG_USBD_PRODUCTID, then U-Boot
  776. should pretend to be a Linux device to it's target host.
  777. CONFIG_USBD_MANUFACTURER
  778. Define this string as the name of your company for
  779. - CONFIG_USBD_MANUFACTURER "my company"
  780. CONFIG_USBD_PRODUCT_NAME
  781. Define this string as the name of your product
  782. - CONFIG_USBD_PRODUCT_NAME "acme usb device"
  783. CONFIG_USBD_VENDORID
  784. Define this as your assigned Vendor ID from the USB
  785. Implementors Forum. This *must* be a genuine Vendor ID
  786. to avoid polluting the USB namespace.
  787. - CONFIG_USBD_VENDORID 0xFFFF
  788. CONFIG_USBD_PRODUCTID
  789. Define this as the unique Product ID
  790. for your device
  791. - CONFIG_USBD_PRODUCTID 0xFFFF
  792. - MMC Support:
  793. The MMC controller on the Intel PXA is supported. To
  794. enable this define CONFIG_MMC. The MMC can be
  795. accessed from the boot prompt by mapping the device
  796. to physical memory similar to flash. Command line is
  797. enabled with CONFIG_CMD_MMC. The MMC driver also works with
  798. the FAT fs. This is enabled with CONFIG_CMD_FAT.
  799. - Journaling Flash filesystem support:
  800. CONFIG_JFFS2_NAND, CONFIG_JFFS2_NAND_OFF, CONFIG_JFFS2_NAND_SIZE,
  801. CONFIG_JFFS2_NAND_DEV
  802. Define these for a default partition on a NAND device
  803. CONFIG_SYS_JFFS2_FIRST_SECTOR,
  804. CONFIG_SYS_JFFS2_FIRST_BANK, CONFIG_SYS_JFFS2_NUM_BANKS
  805. Define these for a default partition on a NOR device
  806. CONFIG_SYS_JFFS_CUSTOM_PART
  807. Define this to create an own partition. You have to provide a
  808. function struct part_info* jffs2_part_info(int part_num)
  809. If you define only one JFFS2 partition you may also want to
  810. #define CONFIG_SYS_JFFS_SINGLE_PART 1
  811. to disable the command chpart. This is the default when you
  812. have not defined a custom partition
  813. - Keyboard Support:
  814. CONFIG_ISA_KEYBOARD
  815. Define this to enable standard (PC-Style) keyboard
  816. support
  817. CONFIG_I8042_KBD
  818. Standard PC keyboard driver with US (is default) and
  819. GERMAN key layout (switch via environment 'keymap=de') support.
  820. Export function i8042_kbd_init, i8042_tstc and i8042_getc
  821. for cfb_console. Supports cursor blinking.
  822. - Video support:
  823. CONFIG_VIDEO
  824. Define this to enable video support (for output to
  825. video).
  826. CONFIG_VIDEO_CT69000
  827. Enable Chips & Technologies 69000 Video chip
  828. CONFIG_VIDEO_SMI_LYNXEM
  829. Enable Silicon Motion SMI 712/710/810 Video chip. The
  830. video output is selected via environment 'videoout'
  831. (1 = LCD and 2 = CRT). If videoout is undefined, CRT is
  832. assumed.
  833. For the CT69000 and SMI_LYNXEM drivers, videomode is
  834. selected via environment 'videomode'. Two different ways
  835. are possible:
  836. - "videomode=num" 'num' is a standard LiLo mode numbers.
  837. Following standard modes are supported (* is default):
  838. Colors 640x480 800x600 1024x768 1152x864 1280x1024
  839. -------------+---------------------------------------------
  840. 8 bits | 0x301* 0x303 0x305 0x161 0x307
  841. 15 bits | 0x310 0x313 0x316 0x162 0x319
  842. 16 bits | 0x311 0x314 0x317 0x163 0x31A
  843. 24 bits | 0x312 0x315 0x318 ? 0x31B
  844. -------------+---------------------------------------------
  845. (i.e. setenv videomode 317; saveenv; reset;)
  846. - "videomode=bootargs" all the video parameters are parsed
  847. from the bootargs. (See drivers/video/videomodes.c)
  848. CONFIG_VIDEO_SED13806
  849. Enable Epson SED13806 driver. This driver supports 8bpp
  850. and 16bpp modes defined by CONFIG_VIDEO_SED13806_8BPP
  851. or CONFIG_VIDEO_SED13806_16BPP
  852. - Keyboard Support:
  853. CONFIG_KEYBOARD
  854. Define this to enable a custom keyboard support.
  855. This simply calls drv_keyboard_init() which must be
  856. defined in your board-specific files.
  857. The only board using this so far is RBC823.
  858. - LCD Support: CONFIG_LCD
  859. Define this to enable LCD support (for output to LCD
  860. display); also select one of the supported displays
  861. by defining one of these:
  862. CONFIG_ATMEL_LCD:
  863. HITACHI TX09D70VM1CCA, 3.5", 240x320.
  864. CONFIG_NEC_NL6448AC33:
  865. NEC NL6448AC33-18. Active, color, single scan.
  866. CONFIG_NEC_NL6448BC20
  867. NEC NL6448BC20-08. 6.5", 640x480.
  868. Active, color, single scan.
  869. CONFIG_NEC_NL6448BC33_54
  870. NEC NL6448BC33-54. 10.4", 640x480.
  871. Active, color, single scan.
  872. CONFIG_SHARP_16x9
  873. Sharp 320x240. Active, color, single scan.
  874. It isn't 16x9, and I am not sure what it is.
  875. CONFIG_SHARP_LQ64D341
  876. Sharp LQ64D341 display, 640x480.
  877. Active, color, single scan.
  878. CONFIG_HLD1045
  879. HLD1045 display, 640x480.
  880. Active, color, single scan.
  881. CONFIG_OPTREX_BW
  882. Optrex CBL50840-2 NF-FW 99 22 M5
  883. or
  884. Hitachi LMG6912RPFC-00T
  885. or
  886. Hitachi SP14Q002
  887. 320x240. Black & white.
  888. Normally display is black on white background; define
  889. CONFIG_SYS_WHITE_ON_BLACK to get it inverted.
  890. - Splash Screen Support: CONFIG_SPLASH_SCREEN
  891. If this option is set, the environment is checked for
  892. a variable "splashimage". If found, the usual display
  893. of logo, copyright and system information on the LCD
  894. is suppressed and the BMP image at the address
  895. specified in "splashimage" is loaded instead. The
  896. console is redirected to the "nulldev", too. This
  897. allows for a "silent" boot where a splash screen is
  898. loaded very quickly after power-on.
  899. CONFIG_SPLASH_SCREEN_ALIGN
  900. If this option is set the splash image can be freely positioned
  901. on the screen. Environment variable "splashpos" specifies the
  902. position as "x,y". If a positive number is given it is used as
  903. number of pixel from left/top. If a negative number is given it
  904. is used as number of pixel from right/bottom. You can also
  905. specify 'm' for centering the image.
  906. Example:
  907. setenv splashpos m,m
  908. => image at center of screen
  909. setenv splashpos 30,20
  910. => image at x = 30 and y = 20
  911. setenv splashpos -10,m
  912. => vertically centered image
  913. at x = dspWidth - bmpWidth - 9
  914. - Gzip compressed BMP image support: CONFIG_VIDEO_BMP_GZIP
  915. If this option is set, additionally to standard BMP
  916. images, gzipped BMP images can be displayed via the
  917. splashscreen support or the bmp command.
  918. - Run length encoded BMP image (RLE8) support: CONFIG_VIDEO_BMP_RLE8
  919. If this option is set, 8-bit RLE compressed BMP images
  920. can be displayed via the splashscreen support or the
  921. bmp command.
  922. - Compression support:
  923. CONFIG_BZIP2
  924. If this option is set, support for bzip2 compressed
  925. images is included. If not, only uncompressed and gzip
  926. compressed images are supported.
  927. NOTE: the bzip2 algorithm requires a lot of RAM, so
  928. the malloc area (as defined by CONFIG_SYS_MALLOC_LEN) should
  929. be at least 4MB.
  930. CONFIG_LZMA
  931. If this option is set, support for lzma compressed
  932. images is included.
  933. Note: The LZMA algorithm adds between 2 and 4KB of code and it
  934. requires an amount of dynamic memory that is given by the
  935. formula:
  936. (1846 + 768 << (lc + lp)) * sizeof(uint16)
  937. Where lc and lp stand for, respectively, Literal context bits
  938. and Literal pos bits.
  939. This value is upper-bounded by 14MB in the worst case. Anyway,
  940. for a ~4MB large kernel image, we have lc=3 and lp=0 for a
  941. total amount of (1846 + 768 << (3 + 0)) * 2 = ~41KB... that is
  942. a very small buffer.
  943. Use the lzmainfo tool to determinate the lc and lp values and
  944. then calculate the amount of needed dynamic memory (ensuring
  945. the appropriate CONFIG_SYS_MALLOC_LEN value).
  946. - MII/PHY support:
  947. CONFIG_PHY_ADDR
  948. The address of PHY on MII bus.
  949. CONFIG_PHY_CLOCK_FREQ (ppc4xx)
  950. The clock frequency of the MII bus
  951. CONFIG_PHY_GIGE
  952. If this option is set, support for speed/duplex
  953. detection of gigabit PHY is included.
  954. CONFIG_PHY_RESET_DELAY
  955. Some PHY like Intel LXT971A need extra delay after
  956. reset before any MII register access is possible.
  957. For such PHY, set this option to the usec delay
  958. required. (minimum 300usec for LXT971A)
  959. CONFIG_PHY_CMD_DELAY (ppc4xx)
  960. Some PHY like Intel LXT971A need extra delay after
  961. command issued before MII status register can be read
  962. - Ethernet address:
  963. CONFIG_ETHADDR
  964. CONFIG_ETH1ADDR
  965. CONFIG_ETH2ADDR
  966. CONFIG_ETH3ADDR
  967. CONFIG_ETH4ADDR
  968. CONFIG_ETH5ADDR
  969. Define a default value for Ethernet address to use
  970. for the respective Ethernet interface, in case this
  971. is not determined automatically.
  972. - IP address:
  973. CONFIG_IPADDR
  974. Define a default value for the IP address to use for
  975. the default Ethernet interface, in case this is not
  976. determined through e.g. bootp.
  977. - Server IP address:
  978. CONFIG_SERVERIP
  979. Defines a default value for the IP address of a TFTP
  980. server to contact when using the "tftboot" command.
  981. CONFIG_KEEP_SERVERADDR
  982. Keeps the server's MAC address, in the env 'serveraddr'
  983. for passing to bootargs (like Linux's netconsole option)
  984. - Multicast TFTP Mode:
  985. CONFIG_MCAST_TFTP
  986. Defines whether you want to support multicast TFTP as per
  987. rfc-2090; for example to work with atftp. Lets lots of targets
  988. tftp down the same boot image concurrently. Note: the Ethernet
  989. driver in use must provide a function: mcast() to join/leave a
  990. multicast group.
  991. CONFIG_BOOTP_RANDOM_DELAY
  992. - BOOTP Recovery Mode:
  993. CONFIG_BOOTP_RANDOM_DELAY
  994. If you have many targets in a network that try to
  995. boot using BOOTP, you may want to avoid that all
  996. systems send out BOOTP requests at precisely the same
  997. moment (which would happen for instance at recovery
  998. from a power failure, when all systems will try to
  999. boot, thus flooding the BOOTP server. Defining
  1000. CONFIG_BOOTP_RANDOM_DELAY causes a random delay to be
  1001. inserted before sending out BOOTP requests. The
  1002. following delays are inserted then:
  1003. 1st BOOTP request: delay 0 ... 1 sec
  1004. 2nd BOOTP request: delay 0 ... 2 sec
  1005. 3rd BOOTP request: delay 0 ... 4 sec
  1006. 4th and following
  1007. BOOTP requests: delay 0 ... 8 sec
  1008. - DHCP Advanced Options:
  1009. You can fine tune the DHCP functionality by defining
  1010. CONFIG_BOOTP_* symbols:
  1011. CONFIG_BOOTP_SUBNETMASK
  1012. CONFIG_BOOTP_GATEWAY
  1013. CONFIG_BOOTP_HOSTNAME
  1014. CONFIG_BOOTP_NISDOMAIN
  1015. CONFIG_BOOTP_BOOTPATH
  1016. CONFIG_BOOTP_BOOTFILESIZE
  1017. CONFIG_BOOTP_DNS
  1018. CONFIG_BOOTP_DNS2
  1019. CONFIG_BOOTP_SEND_HOSTNAME
  1020. CONFIG_BOOTP_NTPSERVER
  1021. CONFIG_BOOTP_TIMEOFFSET
  1022. CONFIG_BOOTP_VENDOREX
  1023. CONFIG_BOOTP_SERVERIP - TFTP server will be the serverip
  1024. environment variable, not the BOOTP server.
  1025. CONFIG_BOOTP_DNS2 - If a DHCP client requests the DNS
  1026. serverip from a DHCP server, it is possible that more
  1027. than one DNS serverip is offered to the client.
  1028. If CONFIG_BOOTP_DNS2 is enabled, the secondary DNS
  1029. serverip will be stored in the additional environment
  1030. variable "dnsip2". The first DNS serverip is always
  1031. stored in the variable "dnsip", when CONFIG_BOOTP_DNS
  1032. is defined.
  1033. CONFIG_BOOTP_SEND_HOSTNAME - Some DHCP servers are capable
  1034. to do a dynamic update of a DNS server. To do this, they
  1035. need the hostname of the DHCP requester.
  1036. If CONFIG_BOOTP_SEND_HOSTNAME is defined, the content
  1037. of the "hostname" environment variable is passed as
  1038. option 12 to the DHCP server.
  1039. CONFIG_BOOTP_DHCP_REQUEST_DELAY
  1040. A 32bit value in microseconds for a delay between
  1041. receiving a "DHCP Offer" and sending the "DHCP Request".
  1042. This fixes a problem with certain DHCP servers that don't
  1043. respond 100% of the time to a "DHCP request". E.g. On an
  1044. AT91RM9200 processor running at 180MHz, this delay needed
  1045. to be *at least* 15,000 usec before a Windows Server 2003
  1046. DHCP server would reply 100% of the time. I recommend at
  1047. least 50,000 usec to be safe. The alternative is to hope
  1048. that one of the retries will be successful but note that
  1049. the DHCP timeout and retry process takes a longer than
  1050. this delay.
  1051. - CDP Options:
  1052. CONFIG_CDP_DEVICE_ID
  1053. The device id used in CDP trigger frames.
  1054. CONFIG_CDP_DEVICE_ID_PREFIX
  1055. A two character string which is prefixed to the MAC address
  1056. of the device.
  1057. CONFIG_CDP_PORT_ID
  1058. A printf format string which contains the ascii name of
  1059. the port. Normally is set to "eth%d" which sets
  1060. eth0 for the first Ethernet, eth1 for the second etc.
  1061. CONFIG_CDP_CAPABILITIES
  1062. A 32bit integer which indicates the device capabilities;
  1063. 0x00000010 for a normal host which does not forwards.
  1064. CONFIG_CDP_VERSION
  1065. An ascii string containing the version of the software.
  1066. CONFIG_CDP_PLATFORM
  1067. An ascii string containing the name of the platform.
  1068. CONFIG_CDP_TRIGGER
  1069. A 32bit integer sent on the trigger.
  1070. CONFIG_CDP_POWER_CONSUMPTION
  1071. A 16bit integer containing the power consumption of the
  1072. device in .1 of milliwatts.
  1073. CONFIG_CDP_APPLIANCE_VLAN_TYPE
  1074. A byte containing the id of the VLAN.
  1075. - Status LED: CONFIG_STATUS_LED
  1076. Several configurations allow to display the current
  1077. status using a LED. For instance, the LED will blink
  1078. fast while running U-Boot code, stop blinking as
  1079. soon as a reply to a BOOTP request was received, and
  1080. start blinking slow once the Linux kernel is running
  1081. (supported by a status LED driver in the Linux
  1082. kernel). Defining CONFIG_STATUS_LED enables this
  1083. feature in U-Boot.
  1084. - CAN Support: CONFIG_CAN_DRIVER
  1085. Defining CONFIG_CAN_DRIVER enables CAN driver support
  1086. on those systems that support this (optional)
  1087. feature, like the TQM8xxL modules.
  1088. - I2C Support: CONFIG_HARD_I2C | CONFIG_SOFT_I2C
  1089. These enable I2C serial bus commands. Defining either of
  1090. (but not both of) CONFIG_HARD_I2C or CONFIG_SOFT_I2C will
  1091. include the appropriate I2C driver for the selected CPU.
  1092. This will allow you to use i2c commands at the u-boot
  1093. command line (as long as you set CONFIG_CMD_I2C in
  1094. CONFIG_COMMANDS) and communicate with i2c based realtime
  1095. clock chips. See common/cmd_i2c.c for a description of the
  1096. command line interface.
  1097. CONFIG_HARD_I2C selects a hardware I2C controller.
  1098. CONFIG_SOFT_I2C configures u-boot to use a software (aka
  1099. bit-banging) driver instead of CPM or similar hardware
  1100. support for I2C.
  1101. There are several other quantities that must also be
  1102. defined when you define CONFIG_HARD_I2C or CONFIG_SOFT_I2C.
  1103. In both cases you will need to define CONFIG_SYS_I2C_SPEED
  1104. to be the frequency (in Hz) at which you wish your i2c bus
  1105. to run and CONFIG_SYS_I2C_SLAVE to be the address of this node (ie
  1106. the CPU's i2c node address).
  1107. Now, the u-boot i2c code for the mpc8xx
  1108. (arch/powerpc/cpu/mpc8xx/i2c.c) sets the CPU up as a master node
  1109. and so its address should therefore be cleared to 0 (See,
  1110. eg, MPC823e User's Manual p.16-473). So, set
  1111. CONFIG_SYS_I2C_SLAVE to 0.
  1112. CONFIG_SYS_I2C_INIT_MPC5XXX
  1113. When a board is reset during an i2c bus transfer
  1114. chips might think that the current transfer is still
  1115. in progress. Reset the slave devices by sending start
  1116. commands until the slave device responds.
  1117. That's all that's required for CONFIG_HARD_I2C.
  1118. If you use the software i2c interface (CONFIG_SOFT_I2C)
  1119. then the following macros need to be defined (examples are
  1120. from include/configs/lwmon.h):
  1121. I2C_INIT
  1122. (Optional). Any commands necessary to enable the I2C
  1123. controller or configure ports.
  1124. eg: #define I2C_INIT (immr->im_cpm.cp_pbdir |= PB_SCL)
  1125. I2C_PORT
  1126. (Only for MPC8260 CPU). The I/O port to use (the code
  1127. assumes both bits are on the same port). Valid values
  1128. are 0..3 for ports A..D.
  1129. I2C_ACTIVE
  1130. The code necessary to make the I2C data line active
  1131. (driven). If the data line is open collector, this
  1132. define can be null.
  1133. eg: #define I2C_ACTIVE (immr->im_cpm.cp_pbdir |= PB_SDA)
  1134. I2C_TRISTATE
  1135. The code necessary to make the I2C data line tri-stated
  1136. (inactive). If the data line is open collector, this
  1137. define can be null.
  1138. eg: #define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA)
  1139. I2C_READ
  1140. Code that returns TRUE if the I2C data line is high,
  1141. FALSE if it is low.
  1142. eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0)
  1143. I2C_SDA(bit)
  1144. If <bit> is TRUE, sets the I2C data line high. If it
  1145. is FALSE, it clears it (low).
  1146. eg: #define I2C_SDA(bit) \
  1147. if(bit) immr->im_cpm.cp_pbdat |= PB_SDA; \
  1148. else immr->im_cpm.cp_pbdat &= ~PB_SDA
  1149. I2C_SCL(bit)
  1150. If <bit> is TRUE, sets the I2C clock line high. If it
  1151. is FALSE, it clears it (low).
  1152. eg: #define I2C_SCL(bit) \
  1153. if(bit) immr->im_cpm.cp_pbdat |= PB_SCL; \
  1154. else immr->im_cpm.cp_pbdat &= ~PB_SCL
  1155. I2C_DELAY
  1156. This delay is invoked four times per clock cycle so this
  1157. controls the rate of data transfer. The data rate thus
  1158. is 1 / (I2C_DELAY * 4). Often defined to be something
  1159. like:
  1160. #define I2C_DELAY udelay(2)
  1161. CONFIG_SYS_I2C_INIT_BOARD
  1162. When a board is reset during an i2c bus transfer
  1163. chips might think that the current transfer is still
  1164. in progress. On some boards it is possible to access
  1165. the i2c SCLK line directly, either by using the
  1166. processor pin as a GPIO or by having a second pin
  1167. connected to the bus. If this option is defined a
  1168. custom i2c_init_board() routine in boards/xxx/board.c
  1169. is run early in the boot sequence.
  1170. CONFIG_I2CFAST (PPC405GP|PPC405EP only)
  1171. This option enables configuration of bi_iic_fast[] flags
  1172. in u-boot bd_info structure based on u-boot environment
  1173. variable "i2cfast". (see also i2cfast)
  1174. CONFIG_I2C_MULTI_BUS
  1175. This option allows the use of multiple I2C buses, each of which
  1176. must have a controller. At any point in time, only one bus is
  1177. active. To switch to a different bus, use the 'i2c dev' command.
  1178. Note that bus numbering is zero-based.
  1179. CONFIG_SYS_I2C_NOPROBES
  1180. This option specifies a list of I2C devices that will be skipped
  1181. when the 'i2c probe' command is issued. If CONFIG_I2C_MULTI_BUS
  1182. is set, specify a list of bus-device pairs. Otherwise, specify
  1183. a 1D array of device addresses
  1184. e.g.
  1185. #undef CONFIG_I2C_MULTI_BUS
  1186. #define CONFIG_SYS_I2C_NOPROBES {0x50,0x68}
  1187. will skip addresses 0x50 and 0x68 on a board with one I2C bus
  1188. #define CONFIG_I2C_MULTI_BUS
  1189. #define CONFIG_SYS_I2C_MULTI_NOPROBES {{0,0x50},{0,0x68},{1,0x54}}
  1190. will skip addresses 0x50 and 0x68 on bus 0 and address 0x54 on bus 1
  1191. CONFIG_SYS_SPD_BUS_NUM
  1192. If defined, then this indicates the I2C bus number for DDR SPD.
  1193. If not defined, then U-Boot assumes that SPD is on I2C bus 0.
  1194. CONFIG_SYS_RTC_BUS_NUM
  1195. If defined, then this indicates the I2C bus number for the RTC.
  1196. If not defined, then U-Boot assumes that RTC is on I2C bus 0.
  1197. CONFIG_SYS_DTT_BUS_NUM
  1198. If defined, then this indicates the I2C bus number for the DTT.
  1199. If not defined, then U-Boot assumes that DTT is on I2C bus 0.
  1200. CONFIG_SYS_I2C_DTT_ADDR:
  1201. If defined, specifies the I2C address of the DTT device.
  1202. If not defined, then U-Boot uses predefined value for
  1203. specified DTT device.
  1204. CONFIG_FSL_I2C
  1205. Define this option if you want to use Freescale's I2C driver in
  1206. drivers/i2c/fsl_i2c.c.
  1207. CONFIG_I2C_MUX
  1208. Define this option if you have I2C devices reached over 1 .. n
  1209. I2C Muxes like the pca9544a. This option addes a new I2C
  1210. Command "i2c bus [muxtype:muxaddr:muxchannel]" which adds a
  1211. new I2C Bus to the existing I2C Busses. If you select the
  1212. new Bus with "i2c dev", u-bbot sends first the commandos for
  1213. the muxes to activate this new "bus".
  1214. CONFIG_I2C_MULTI_BUS must be also defined, to use this
  1215. feature!
  1216. Example:
  1217. Adding a new I2C Bus reached over 2 pca9544a muxes
  1218. The First mux with address 70 and channel 6
  1219. The Second mux with address 71 and channel 4
  1220. => i2c bus pca9544a:70:6:pca9544a:71:4
  1221. Use the "i2c bus" command without parameter, to get a list
  1222. of I2C Busses with muxes:
  1223. => i2c bus
  1224. Busses reached over muxes:
  1225. Bus ID: 2
  1226. reached over Mux(es):
  1227. pca9544a@70 ch: 4
  1228. Bus ID: 3
  1229. reached over Mux(es):
  1230. pca9544a@70 ch: 6
  1231. pca9544a@71 ch: 4
  1232. =>
  1233. If you now switch to the new I2C Bus 3 with "i2c dev 3"
  1234. u-boot sends First the Commando to the mux@70 to enable
  1235. channel 6, and then the Commando to the mux@71 to enable
  1236. the channel 4.
  1237. After that, you can use the "normal" i2c commands as
  1238. usual, to communicate with your I2C devices behind
  1239. the 2 muxes.
  1240. This option is actually implemented for the bitbanging
  1241. algorithm in common/soft_i2c.c and for the Hardware I2C
  1242. Bus on the MPC8260. But it should be not so difficult
  1243. to add this option to other architectures.
  1244. CONFIG_SOFT_I2C_READ_REPEATED_START
  1245. defining this will force the i2c_read() function in
  1246. the soft_i2c driver to perform an I2C repeated start
  1247. between writing the address pointer and reading the
  1248. data. If this define is omitted the default behaviour
  1249. of doing a stop-start sequence will be used. Most I2C
  1250. devices can use either method, but some require one or
  1251. the other.
  1252. - SPI Support: CONFIG_SPI
  1253. Enables SPI driver (so far only tested with
  1254. SPI EEPROM, also an instance works with Crystal A/D and
  1255. D/As on the SACSng board)
  1256. CONFIG_SPI_X
  1257. Enables extended (16-bit) SPI EEPROM addressing.
  1258. (symmetrical to CONFIG_I2C_X)
  1259. CONFIG_SOFT_SPI
  1260. Enables a software (bit-bang) SPI driver rather than
  1261. using hardware support. This is a general purpose
  1262. driver that only requires three general I/O port pins
  1263. (two outputs, one input) to function. If this is
  1264. defined, the board configuration must define several
  1265. SPI configuration items (port pins to use, etc). For
  1266. an example, see include/configs/sacsng.h.
  1267. CONFIG_HARD_SPI
  1268. Enables a hardware SPI driver for general-purpose reads
  1269. and writes. As with CONFIG_SOFT_SPI, the board configuration
  1270. must define a list of chip-select function pointers.
  1271. Currently supported on some MPC8xxx processors. For an
  1272. example, see include/configs/mpc8349emds.h.
  1273. CONFIG_MXC_SPI
  1274. Enables the driver for the SPI controllers on i.MX and MXC
  1275. SoCs. Currently only i.MX31 is supported.
  1276. - FPGA Support: CONFIG_FPGA
  1277. Enables FPGA subsystem.
  1278. CONFIG_FPGA_<vendor>
  1279. Enables support for specific chip vendors.
  1280. (ALTERA, XILINX)
  1281. CONFIG_FPGA_<family>
  1282. Enables support for FPGA family.
  1283. (SPARTAN2, SPARTAN3, VIRTEX2, CYCLONE2, ACEX1K, ACEX)
  1284. CONFIG_FPGA_COUNT
  1285. Specify the number of FPGA devices to support.
  1286. CONFIG_SYS_FPGA_PROG_FEEDBACK
  1287. Enable printing of hash marks during FPGA configuration.
  1288. CONFIG_SYS_FPGA_CHECK_BUSY
  1289. Enable checks on FPGA configuration interface busy
  1290. status by the configuration function. This option
  1291. will require a board or device specific function to
  1292. be written.
  1293. CONFIG_FPGA_DELAY
  1294. If defined, a function that provides delays in the FPGA
  1295. configuration driver.
  1296. CONFIG_SYS_FPGA_CHECK_CTRLC
  1297. Allow Control-C to interrupt FPGA configuration
  1298. CONFIG_SYS_FPGA_CHECK_ERROR
  1299. Check for configuration errors during FPGA bitfile
  1300. loading. For example, abort during Virtex II
  1301. configuration if the INIT_B line goes low (which
  1302. indicated a CRC error).
  1303. CONFIG_SYS_FPGA_WAIT_INIT
  1304. Maximum time to wait for the INIT_B line to deassert
  1305. after PROB_B has been deasserted during a Virtex II
  1306. FPGA configuration sequence. The default time is 500
  1307. ms.
  1308. CONFIG_SYS_FPGA_WAIT_BUSY
  1309. Maximum time to wait for BUSY to deassert during
  1310. Virtex II FPGA configuration. The default is 5 ms.
  1311. CONFIG_SYS_FPGA_WAIT_CONFIG
  1312. Time to wait after FPGA configuration. The default is
  1313. 200 ms.
  1314. - Configuration Management:
  1315. CONFIG_IDENT_STRING
  1316. If defined, this string will be added to the U-Boot
  1317. version information (U_BOOT_VERSION)
  1318. - Vendor Parameter Protection:
  1319. U-Boot considers the values of the environment
  1320. variables "serial#" (Board Serial Number) and
  1321. "ethaddr" (Ethernet Address) to be parameters that
  1322. are set once by the board vendor / manufacturer, and
  1323. protects these variables from casual modification by
  1324. the user. Once set, these variables are read-only,
  1325. and write or delete attempts are rejected. You can
  1326. change this behaviour:
  1327. If CONFIG_ENV_OVERWRITE is #defined in your config
  1328. file, the write protection for vendor parameters is
  1329. completely disabled. Anybody can change or delete
  1330. these parameters.
  1331. Alternatively, if you #define _both_ CONFIG_ETHADDR
  1332. _and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default
  1333. Ethernet address is installed in the environment,
  1334. which can be changed exactly ONCE by the user. [The
  1335. serial# is unaffected by this, i. e. it remains
  1336. read-only.]
  1337. - Protected RAM:
  1338. CONFIG_PRAM
  1339. Define this variable to enable the reservation of
  1340. "protected RAM", i. e. RAM which is not overwritten
  1341. by U-Boot. Define CONFIG_PRAM to hold the number of
  1342. kB you want to reserve for pRAM. You can overwrite
  1343. this default value by defining an environment
  1344. variable "pram" to the number of kB you want to
  1345. reserve. Note that the board info structure will
  1346. still show the full amount of RAM. If pRAM is
  1347. reserved, a new environment variable "mem" will
  1348. automatically be defined to hold the amount of
  1349. remaining RAM in a form that can be passed as boot
  1350. argument to Linux, for instance like that:
  1351. setenv bootargs ... mem=\${mem}
  1352. saveenv
  1353. This way you can tell Linux not to use this memory,
  1354. either, which results in a memory region that will
  1355. not be affected by reboots.
  1356. *WARNING* If your board configuration uses automatic
  1357. detection of the RAM size, you must make sure that
  1358. this memory test is non-destructive. So far, the
  1359. following board configurations are known to be
  1360. "pRAM-clean":
  1361. ETX094, IVMS8, IVML24, SPD8xx, TQM8xxL,
  1362. HERMES, IP860, RPXlite, LWMON, LANTEC,
  1363. PCU_E, FLAGADM, TQM8260
  1364. - Error Recovery:
  1365. CONFIG_PANIC_HANG
  1366. Define this variable to stop the system in case of a
  1367. fatal error, so that you have to reset it manually.
  1368. This is probably NOT a good idea for an embedded
  1369. system where you want the system to reboot
  1370. automatically as fast as possible, but it may be
  1371. useful during development since you can try to debug
  1372. the conditions that lead to the situation.
  1373. CONFIG_NET_RETRY_COUNT
  1374. This variable defines the number of retries for
  1375. network operations like ARP, RARP, TFTP, or BOOTP
  1376. before giving up the operation. If not defined, a
  1377. default value of 5 is used.
  1378. CONFIG_ARP_TIMEOUT
  1379. Timeout waiting for an ARP reply in milliseconds.
  1380. - Command Interpreter:
  1381. CONFIG_AUTO_COMPLETE
  1382. Enable auto completion of commands using TAB.
  1383. Note that this feature has NOT been implemented yet
  1384. for the "hush" shell.
  1385. CONFIG_SYS_HUSH_PARSER
  1386. Define this variable to enable the "hush" shell (from
  1387. Busybox) as command line interpreter, thus enabling
  1388. powerful command line syntax like
  1389. if...then...else...fi conditionals or `&&' and '||'
  1390. constructs ("shell scripts").
  1391. If undefined, you get the old, much simpler behaviour
  1392. with a somewhat smaller memory footprint.
  1393. CONFIG_SYS_PROMPT_HUSH_PS2
  1394. This defines the secondary prompt string, which is
  1395. printed when the command interpreter needs more input
  1396. to complete a command. Usually "> ".
  1397. Note:
  1398. In the current implementation, the local variables
  1399. space and global environment variables space are
  1400. separated. Local variables are those you define by
  1401. simply typing `name=value'. To access a local
  1402. variable later on, you have write `$name' or
  1403. `${name}'; to execute the contents of a variable
  1404. directly type `$name' at the command prompt.
  1405. Global environment variables are those you use
  1406. setenv/printenv to work with. To run a command stored
  1407. in such a variable, you need to use the run command,
  1408. and you must not use the '$' sign to access them.
  1409. To store commands and special characters in a
  1410. variable, please use double quotation marks
  1411. surrounding the whole text of the variable, instead
  1412. of the backslashes before semicolons and special
  1413. symbols.
  1414. - Commandline Editing and History:
  1415. CONFIG_CMDLINE_EDITING
  1416. Enable editing and History functions for interactive
  1417. commandline input operations
  1418. - Default Environment:
  1419. CONFIG_EXTRA_ENV_SETTINGS
  1420. Define this to contain any number of null terminated
  1421. strings (variable = value pairs) that will be part of
  1422. the default environment compiled into the boot image.
  1423. For example, place something like this in your
  1424. board's config file:
  1425. #define CONFIG_EXTRA_ENV_SETTINGS \
  1426. "myvar1=value1\0" \
  1427. "myvar2=value2\0"
  1428. Warning: This method is based on knowledge about the
  1429. internal format how the environment is stored by the
  1430. U-Boot code. This is NOT an official, exported
  1431. interface! Although it is unlikely that this format
  1432. will change soon, there is no guarantee either.
  1433. You better know what you are doing here.
  1434. Note: overly (ab)use of the default environment is
  1435. discouraged. Make sure to check other ways to preset
  1436. the environment like the "source" command or the
  1437. boot command first.
  1438. - DataFlash Support:
  1439. CONFIG_HAS_DATAFLASH
  1440. Defining this option enables DataFlash features and
  1441. allows to read/write in Dataflash via the standard
  1442. commands cp, md...
  1443. - SystemACE Support:
  1444. CONFIG_SYSTEMACE
  1445. Adding this option adds support for Xilinx SystemACE
  1446. chips attached via some sort of local bus. The address
  1447. of the chip must also be defined in the
  1448. CONFIG_SYS_SYSTEMACE_BASE macro. For example:
  1449. #define CONFIG_SYSTEMACE
  1450. #define CONFIG_SYS_SYSTEMACE_BASE 0xf0000000
  1451. When SystemACE support is added, the "ace" device type
  1452. becomes available to the fat commands, i.e. fatls.
  1453. - TFTP Fixed UDP Port:
  1454. CONFIG_TFTP_PORT
  1455. If this is defined, the environment variable tftpsrcp
  1456. is used to supply the TFTP UDP source port value.
  1457. If tftpsrcp isn't defined, the normal pseudo-random port
  1458. number generator is used.
  1459. Also, the environment variable tftpdstp is used to supply
  1460. the TFTP UDP destination port value. If tftpdstp isn't
  1461. defined, the normal port 69 is used.
  1462. The purpose for tftpsrcp is to allow a TFTP server to
  1463. blindly start the TFTP transfer using the pre-configured
  1464. target IP address and UDP port. This has the effect of
  1465. "punching through" the (Windows XP) firewall, allowing
  1466. the remainder of the TFTP transfer to proceed normally.
  1467. A better solution is to properly configure the firewall,
  1468. but sometimes that is not allowed.
  1469. - Show boot progress:
  1470. CONFIG_SHOW_BOOT_PROGRESS
  1471. Defining this option allows to add some board-
  1472. specific code (calling a user-provided function
  1473. "show_boot_progress(int)") that enables you to show
  1474. the system's boot progress on some display (for
  1475. example, some LED's) on your board. At the moment,
  1476. the following checkpoints are implemented:
  1477. Legacy uImage format:
  1478. Arg Where When
  1479. 1 common/cmd_bootm.c before attempting to boot an image
  1480. -1 common/cmd_bootm.c Image header has bad magic number
  1481. 2 common/cmd_bootm.c Image header has correct magic number
  1482. -2 common/cmd_bootm.c Image header has bad checksum
  1483. 3 common/cmd_bootm.c Image header has correct checksum
  1484. -3 common/cmd_bootm.c Image data has bad checksum
  1485. 4 common/cmd_bootm.c Image data has correct checksum
  1486. -4 common/cmd_bootm.c Image is for unsupported architecture
  1487. 5 common/cmd_bootm.c Architecture check OK
  1488. -5 common/cmd_bootm.c Wrong Image Type (not kernel, multi)
  1489. 6 common/cmd_bootm.c Image Type check OK
  1490. -6 common/cmd_bootm.c gunzip uncompression error
  1491. -7 common/cmd_bootm.c Unimplemented compression type
  1492. 7 common/cmd_bootm.c Uncompression OK
  1493. 8 common/cmd_bootm.c No uncompress/copy overwrite error
  1494. -9 common/cmd_bootm.c Unsupported OS (not Linux, BSD, VxWorks, QNX)
  1495. 9 common/image.c Start initial ramdisk verification
  1496. -10 common/image.c Ramdisk header has bad magic number
  1497. -11 common/image.c Ramdisk header has bad checksum
  1498. 10 common/image.c Ramdisk header is OK
  1499. -12 common/image.c Ramdisk data has bad checksum
  1500. 11 common/image.c Ramdisk data has correct checksum
  1501. 12 common/image.c Ramdisk verification complete, start loading
  1502. -13 common/image.c Wrong Image Type (not PPC Linux ramdisk)
  1503. 13 common/image.c Start multifile image verification
  1504. 14 common/image.c No initial ramdisk, no multifile, continue.
  1505. 15 arch/<arch>/lib/bootm.c All preparation done, transferring control to OS
  1506. -30 arch/powerpc/lib/board.c Fatal error, hang the system
  1507. -31 post/post.c POST test failed, detected by post_output_backlog()
  1508. -32 post/post.c POST test failed, detected by post_run_single()
  1509. 34 common/cmd_doc.c before loading a Image from a DOC device
  1510. -35 common/cmd_doc.c Bad usage of "doc" command
  1511. 35 common/cmd_doc.c correct usage of "doc" command
  1512. -36 common/cmd_doc.c No boot device
  1513. 36 common/cmd_doc.c correct boot device
  1514. -37 common/cmd_doc.c Unknown Chip ID on boot device
  1515. 37 common/cmd_doc.c correct chip ID found, device available
  1516. -38 common/cmd_doc.c Read Error on boot device
  1517. 38 common/cmd_doc.c reading Image header from DOC device OK
  1518. -39 common/cmd_doc.c Image header has bad magic number
  1519. 39 common/cmd_doc.c Image header has correct magic number
  1520. -40 common/cmd_doc.c Error reading Image from DOC device
  1521. 40 common/cmd_doc.c Image header has correct magic number
  1522. 41 common/cmd_ide.c before loading a Image from a IDE device
  1523. -42 common/cmd_ide.c Bad usage of "ide" command
  1524. 42 common/cmd_ide.c correct usage of "ide" command
  1525. -43 common/cmd_ide.c No boot device
  1526. 43 common/cmd_ide.c boot device found
  1527. -44 common/cmd_ide.c Device not available
  1528. 44 common/cmd_ide.c Device available
  1529. -45 common/cmd_ide.c wrong partition selected
  1530. 45 common/cmd_ide.c partition selected
  1531. -46 common/cmd_ide.c Unknown partition table
  1532. 46 common/cmd_ide.c valid partition table found
  1533. -47 common/cmd_ide.c Invalid partition type
  1534. 47 common/cmd_ide.c correct partition type
  1535. -48 common/cmd_ide.c Error reading Image Header on boot device
  1536. 48 common/cmd_ide.c reading Image Header from IDE device OK
  1537. -49 common/cmd_ide.c Image header has bad magic number
  1538. 49 common/cmd_ide.c Image header has correct magic number
  1539. -50 common/cmd_ide.c Image header has bad checksum
  1540. 50 common/cmd_ide.c Image header has correct checksum
  1541. -51 common/cmd_ide.c Error reading Image from IDE device
  1542. 51 common/cmd_ide.c reading Image from IDE device OK
  1543. 52 common/cmd_nand.c before loading a Image from a NAND device
  1544. -53 common/cmd_nand.c Bad usage of "nand" command
  1545. 53 common/cmd_nand.c correct usage of "nand" command
  1546. -54 common/cmd_nand.c No boot device
  1547. 54 common/cmd_nand.c boot device found
  1548. -55 common/cmd_nand.c Unknown Chip ID on boot device
  1549. 55 common/cmd_nand.c correct chip ID found, device available
  1550. -56 common/cmd_nand.c Error reading Image Header on boot device
  1551. 56 common/cmd_nand.c reading Image Header from NAND device OK
  1552. -57 common/cmd_nand.c Image header has bad magic number
  1553. 57 common/cmd_nand.c Image header has correct magic number
  1554. -58 common/cmd_nand.c Error reading Image from NAND device
  1555. 58 common/cmd_nand.c reading Image from NAND device OK
  1556. -60 common/env_common.c Environment has a bad CRC, using default
  1557. 64 net/eth.c starting with Ethernet configuration.
  1558. -64 net/eth.c no Ethernet found.
  1559. 65 net/eth.c Ethernet found.
  1560. -80 common/cmd_net.c usage wrong
  1561. 80 common/cmd_net.c before calling NetLoop()
  1562. -81 common/cmd_net.c some error in NetLoop() occurred
  1563. 81 common/cmd_net.c NetLoop() back without error
  1564. -82 common/cmd_net.c size == 0 (File with size 0 loaded)
  1565. 82 common/cmd_net.c trying automatic boot
  1566. 83 common/cmd_net.c running "source" command
  1567. -83 common/cmd_net.c some error in automatic boot or "source" command
  1568. 84 common/cmd_net.c end without errors
  1569. FIT uImage format:
  1570. Arg Where When
  1571. 100 common/cmd_bootm.c Kernel FIT Image has correct format
  1572. -100 common/cmd_bootm.c Kernel FIT Image has incorrect format
  1573. 101 common/cmd_bootm.c No Kernel subimage unit name, using configuration
  1574. -101 common/cmd_bootm.c Can't get configuration for kernel subimage
  1575. 102 common/cmd_bootm.c Kernel unit name specified
  1576. -103 common/cmd_bootm.c Can't get kernel subimage node offset
  1577. 103 common/cmd_bootm.c Found configuration node
  1578. 104 common/cmd_bootm.c Got kernel subimage node offset
  1579. -104 common/cmd_bootm.c Kernel subimage hash verification failed
  1580. 105 common/cmd_bootm.c Kernel subimage hash verification OK
  1581. -105 common/cmd_bootm.c Kernel subimage is for unsupported architecture
  1582. 106 common/cmd_bootm.c Architecture check OK
  1583. -106 common/cmd_bootm.c Kernel subimage has wrong type
  1584. 107 common/cmd_bootm.c Kernel subimage type OK
  1585. -107 common/cmd_bootm.c Can't get kernel subimage data/size
  1586. 108 common/cmd_bootm.c Got kernel subimage data/size
  1587. -108 common/cmd_bootm.c Wrong image type (not legacy, FIT)
  1588. -109 common/cmd_bootm.c Can't get kernel subimage type
  1589. -110 common/cmd_bootm.c Can't get kernel subimage comp
  1590. -111 common/cmd_bootm.c Can't get kernel subimage os
  1591. -112 common/cmd_bootm.c Can't get kernel subimage load address
  1592. -113 common/cmd_bootm.c Image uncompress/copy overwrite error
  1593. 120 common/image.c Start initial ramdisk verification
  1594. -120 common/image.c Ramdisk FIT image has incorrect format
  1595. 121 common/image.c Ramdisk FIT image has correct format
  1596. 122 common/image.c No ramdisk subimage unit name, using configuration
  1597. -122 common/image.c Can't get configuration for ramdisk subimage
  1598. 123 common/image.c Ramdisk unit name specified
  1599. -124 common/image.c Can't get ramdisk subimage node offset
  1600. 125 common/image.c Got ramdisk subimage node offset
  1601. -125 common/image.c Ramdisk subimage hash verification failed
  1602. 126 common/image.c Ramdisk subimage hash verification OK
  1603. -126 common/image.c Ramdisk subimage for unsupported architecture
  1604. 127 common/image.c Architecture check OK
  1605. -127 common/image.c Can't get ramdisk subimage data/size
  1606. 128 common/image.c Got ramdisk subimage data/size
  1607. 129 common/image.c Can't get ramdisk load address
  1608. -129 common/image.c Got ramdisk load address
  1609. -130 common/cmd_doc.c Incorrect FIT image format
  1610. 131 common/cmd_doc.c FIT image format OK
  1611. -140 common/cmd_ide.c Incorrect FIT image format
  1612. 141 common/cmd_ide.c FIT image format OK
  1613. -150 common/cmd_nand.c Incorrect FIT image format
  1614. 151 common/cmd_nand.c FIT image format OK
  1615. - Automatic software updates via TFTP server
  1616. CONFIG_UPDATE_TFTP
  1617. CONFIG_UPDATE_TFTP_CNT_MAX
  1618. CONFIG_UPDATE_TFTP_MSEC_MAX
  1619. These options enable and control the auto-update feature;
  1620. for a more detailed description refer to doc/README.update.
  1621. - MTD Support (mtdparts command, UBI support)
  1622. CONFIG_MTD_DEVICE
  1623. Adds the MTD device infrastructure from the Linux kernel.
  1624. Needed for mtdparts command support.
  1625. CONFIG_MTD_PARTITIONS
  1626. Adds the MTD partitioning infrastructure from the Linux
  1627. kernel. Needed for UBI support.
  1628. Modem Support:
  1629. --------------
  1630. [so far only for SMDK2400 and TRAB boards]
  1631. - Modem support enable:
  1632. CONFIG_MODEM_SUPPORT
  1633. - RTS/CTS Flow control enable:
  1634. CONFIG_HWFLOW
  1635. - Modem debug support:
  1636. CONFIG_MODEM_SUPPORT_DEBUG
  1637. Enables debugging stuff (char screen[1024], dbg())
  1638. for modem support. Useful only with BDI2000.
  1639. - Interrupt support (PPC):
  1640. There are common interrupt_init() and timer_interrupt()
  1641. for all PPC archs. interrupt_init() calls interrupt_init_cpu()
  1642. for CPU specific initialization. interrupt_init_cpu()
  1643. should set decrementer_count to appropriate value. If
  1644. CPU resets decrementer automatically after interrupt
  1645. (ppc4xx) it should set decrementer_count to zero.
  1646. timer_interrupt() calls timer_interrupt_cpu() for CPU
  1647. specific handling. If board has watchdog / status_led
  1648. / other_activity_monitor it works automatically from
  1649. general timer_interrupt().
  1650. - General:
  1651. In the target system modem support is enabled when a
  1652. specific key (key combination) is pressed during
  1653. power-on. Otherwise U-Boot will boot normally
  1654. (autoboot). The key_pressed() function is called from
  1655. board_init(). Currently key_pressed() is a dummy
  1656. function, returning 1 and thus enabling modem
  1657. initialization.
  1658. If there are no modem init strings in the
  1659. environment, U-Boot proceed to autoboot; the
  1660. previous output (banner, info printfs) will be
  1661. suppressed, though.
  1662. See also: doc/README.Modem
  1663. Configuration Settings:
  1664. -----------------------
  1665. - CONFIG_SYS_LONGHELP: Defined when you want long help messages included;
  1666. undefine this when you're short of memory.
  1667. - CONFIG_SYS_HELP_CMD_WIDTH: Defined when you want to override the default
  1668. width of the commands listed in the 'help' command output.
  1669. - CONFIG_SYS_PROMPT: This is what U-Boot prints on the console to
  1670. prompt for user input.
  1671. - CONFIG_SYS_CBSIZE: Buffer size for input from the Console
  1672. - CONFIG_SYS_PBSIZE: Buffer size for Console output
  1673. - CONFIG_SYS_MAXARGS: max. Number of arguments accepted for monitor commands
  1674. - CONFIG_SYS_BARGSIZE: Buffer size for Boot Arguments which are passed to
  1675. the application (usually a Linux kernel) when it is
  1676. booted
  1677. - CONFIG_SYS_BAUDRATE_TABLE:
  1678. List of legal baudrate settings for this board.
  1679. - CONFIG_SYS_CONSOLE_INFO_QUIET
  1680. Suppress display of console information at boot.
  1681. - CONFIG_SYS_CONSOLE_IS_IN_ENV
  1682. If the board specific function
  1683. extern int overwrite_console (void);
  1684. returns 1, the stdin, stderr and stdout are switched to the
  1685. serial port, else the settings in the environment are used.
  1686. - CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
  1687. Enable the call to overwrite_console().
  1688. - CONFIG_SYS_CONSOLE_ENV_OVERWRITE
  1689. Enable overwrite of previous console environment settings.
  1690. - CONFIG_SYS_MEMTEST_START, CONFIG_SYS_MEMTEST_END:
  1691. Begin and End addresses of the area used by the
  1692. simple memory test.
  1693. - CONFIG_SYS_ALT_MEMTEST:
  1694. Enable an alternate, more extensive memory test.
  1695. - CONFIG_SYS_MEMTEST_SCRATCH:
  1696. Scratch address used by the alternate memory test
  1697. You only need to set this if address zero isn't writeable
  1698. - CONFIG_SYS_MEM_TOP_HIDE (PPC only):
  1699. If CONFIG_SYS_MEM_TOP_HIDE is defined in the board config header,
  1700. this specified memory area will get subtracted from the top
  1701. (end) of RAM and won't get "touched" at all by U-Boot. By
  1702. fixing up gd->ram_size the Linux kernel should gets passed
  1703. the now "corrected" memory size and won't touch it either.
  1704. This should work for arch/ppc and arch/powerpc. Only Linux
  1705. board ports in arch/powerpc with bootwrapper support that
  1706. recalculate the memory size from the SDRAM controller setup
  1707. will have to get fixed in Linux additionally.
  1708. This option can be used as a workaround for the 440EPx/GRx
  1709. CHIP 11 errata where the last 256 bytes in SDRAM shouldn't
  1710. be touched.
  1711. WARNING: Please make sure that this value is a multiple of
  1712. the Linux page size (normally 4k). If this is not the case,
  1713. then the end address of the Linux memory will be located at a
  1714. non page size aligned address and this could cause major
  1715. problems.
  1716. - CONFIG_SYS_TFTP_LOADADDR:
  1717. Default load address for network file downloads
  1718. - CONFIG_SYS_LOADS_BAUD_CHANGE:
  1719. Enable temporary baudrate change while serial download
  1720. - CONFIG_SYS_SDRAM_BASE:
  1721. Physical start address of SDRAM. _Must_ be 0 here.
  1722. - CONFIG_SYS_MBIO_BASE:
  1723. Physical start address of Motherboard I/O (if using a
  1724. Cogent motherboard)
  1725. - CONFIG_SYS_FLASH_BASE:
  1726. Physical start address of Flash memory.
  1727. - CONFIG_SYS_MONITOR_BASE:
  1728. Physical start address of boot monitor code (set by
  1729. make config files to be same as the text base address
  1730. (TEXT_BASE) used when linking) - same as
  1731. CONFIG_SYS_FLASH_BASE when booting from flash.
  1732. - CONFIG_SYS_MONITOR_LEN:
  1733. Size of memory reserved for monitor code, used to
  1734. determine _at_compile_time_ (!) if the environment is
  1735. embedded within the U-Boot image, or in a separate
  1736. flash sector.
  1737. - CONFIG_SYS_MALLOC_LEN:
  1738. Size of DRAM reserved for malloc() use.
  1739. - CONFIG_SYS_BOOTM_LEN:
  1740. Normally compressed uImages are limited to an
  1741. uncompressed size of 8 MBytes. If this is not enough,
  1742. you can define CONFIG_SYS_BOOTM_LEN in your board config file
  1743. to adjust this setting to your needs.
  1744. - CONFIG_SYS_BOOTMAPSZ:
  1745. Maximum size of memory mapped by the startup code of
  1746. the Linux kernel; all data that must be processed by
  1747. the Linux kernel (bd_info, boot arguments, FDT blob if
  1748. used) must be put below this limit, unless "bootm_low"
  1749. enviroment variable is defined and non-zero. In such case
  1750. all data for the Linux kernel must be between "bootm_low"
  1751. and "bootm_low" + CONFIG_SYS_BOOTMAPSZ.
  1752. - CONFIG_SYS_MAX_FLASH_BANKS:
  1753. Max number of Flash memory banks
  1754. - CONFIG_SYS_MAX_FLASH_SECT:
  1755. Max number of sectors on a Flash chip
  1756. - CONFIG_SYS_FLASH_ERASE_TOUT:
  1757. Timeout for Flash erase operations (in ms)
  1758. - CONFIG_SYS_FLASH_WRITE_TOUT:
  1759. Timeout for Flash write operations (in ms)
  1760. - CONFIG_SYS_FLASH_LOCK_TOUT
  1761. Timeout for Flash set sector lock bit operation (in ms)
  1762. - CONFIG_SYS_FLASH_UNLOCK_TOUT
  1763. Timeout for Flash clear lock bits operation (in ms)
  1764. - CONFIG_SYS_FLASH_PROTECTION
  1765. If defined, hardware flash sectors protection is used
  1766. instead of U-Boot software protection.
  1767. - CONFIG_SYS_DIRECT_FLASH_TFTP:
  1768. Enable TFTP transfers directly to flash memory;
  1769. without this option such a download has to be
  1770. performed in two steps: (1) download to RAM, and (2)
  1771. copy from RAM to flash.
  1772. The two-step approach is usually more reliable, since
  1773. you can check if the download worked before you erase
  1774. the flash, but in some situations (when system RAM is
  1775. too limited to allow for a temporary copy of the
  1776. downloaded image) this option may be very useful.
  1777. - CONFIG_SYS_FLASH_CFI:
  1778. Define if the flash driver uses extra elements in the
  1779. common flash structure for storing flash geometry.
  1780. - CONFIG_FLASH_CFI_DRIVER
  1781. This option also enables the building of the cfi_flash driver
  1782. in the drivers directory
  1783. - CONFIG_FLASH_CFI_MTD
  1784. This option enables the building of the cfi_mtd driver
  1785. in the drivers directory. The driver exports CFI flash
  1786. to the MTD layer.
  1787. - CONFIG_SYS_FLASH_USE_BUFFER_WRITE
  1788. Use buffered writes to flash.
  1789. - CONFIG_FLASH_SPANSION_S29WS_N
  1790. s29ws-n MirrorBit flash has non-standard addresses for buffered
  1791. write commands.
  1792. - CONFIG_SYS_FLASH_QUIET_TEST
  1793. If this option is defined, the common CFI flash doesn't
  1794. print it's warning upon not recognized FLASH banks. This
  1795. is useful, if some of the configured banks are only
  1796. optionally available.
  1797. - CONFIG_FLASH_SHOW_PROGRESS
  1798. If defined (must be an integer), print out countdown
  1799. digits and dots. Recommended value: 45 (9..1) for 80
  1800. column displays, 15 (3..1) for 40 column displays.
  1801. - CONFIG_SYS_RX_ETH_BUFFER:
  1802. Defines the number of Ethernet receive buffers. On some
  1803. Ethernet controllers it is recommended to set this value
  1804. to 8 or even higher (EEPRO100 or 405 EMAC), since all
  1805. buffers can be full shortly after enabling the interface
  1806. on high Ethernet traffic.
  1807. Defaults to 4 if not defined.
  1808. The following definitions that deal with the placement and management
  1809. of environment data (variable area); in general, we support the
  1810. following configurations:
  1811. - CONFIG_ENV_IS_IN_FLASH:
  1812. Define this if the environment is in flash memory.
  1813. a) The environment occupies one whole flash sector, which is
  1814. "embedded" in the text segment with the U-Boot code. This
  1815. happens usually with "bottom boot sector" or "top boot
  1816. sector" type flash chips, which have several smaller
  1817. sectors at the start or the end. For instance, such a
  1818. layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In
  1819. such a case you would place the environment in one of the
  1820. 4 kB sectors - with U-Boot code before and after it. With
  1821. "top boot sector" type flash chips, you would put the
  1822. environment in one of the last sectors, leaving a gap
  1823. between U-Boot and the environment.
  1824. - CONFIG_ENV_OFFSET:
  1825. Offset of environment data (variable area) to the
  1826. beginning of flash memory; for instance, with bottom boot
  1827. type flash chips the second sector can be used: the offset
  1828. for this sector is given here.
  1829. CONFIG_ENV_OFFSET is used relative to CONFIG_SYS_FLASH_BASE.
  1830. - CONFIG_ENV_ADDR:
  1831. This is just another way to specify the start address of
  1832. the flash sector containing the environment (instead of
  1833. CONFIG_ENV_OFFSET).
  1834. - CONFIG_ENV_SECT_SIZE:
  1835. Size of the sector containing the environment.
  1836. b) Sometimes flash chips have few, equal sized, BIG sectors.
  1837. In such a case you don't want to spend a whole sector for
  1838. the environment.
  1839. - CONFIG_ENV_SIZE:
  1840. If you use this in combination with CONFIG_ENV_IS_IN_FLASH
  1841. and CONFIG_ENV_SECT_SIZE, you can specify to use only a part
  1842. of this flash sector for the environment. This saves
  1843. memory for the RAM copy of the environment.
  1844. It may also save flash memory if you decide to use this
  1845. when your environment is "embedded" within U-Boot code,
  1846. since then the remainder of the flash sector could be used
  1847. for U-Boot code. It should be pointed out that this is
  1848. STRONGLY DISCOURAGED from a robustness point of view:
  1849. updating the environment in flash makes it always
  1850. necessary to erase the WHOLE sector. If something goes
  1851. wrong before the contents has been restored from a copy in
  1852. RAM, your target system will be dead.
  1853. - CONFIG_ENV_ADDR_REDUND
  1854. CONFIG_ENV_SIZE_REDUND
  1855. These settings describe a second storage area used to hold
  1856. a redundant copy of the environment data, so that there is
  1857. a valid backup copy in case there is a power failure during
  1858. a "saveenv" operation.
  1859. BE CAREFUL! Any changes to the flash layout, and some changes to the
  1860. source code will make it necessary to adapt <board>/u-boot.lds*
  1861. accordingly!
  1862. - CONFIG_ENV_IS_IN_NVRAM:
  1863. Define this if you have some non-volatile memory device
  1864. (NVRAM, battery buffered SRAM) which you want to use for the
  1865. environment.
  1866. - CONFIG_ENV_ADDR:
  1867. - CONFIG_ENV_SIZE:
  1868. These two #defines are used to determine the memory area you
  1869. want to use for environment. It is assumed that this memory
  1870. can just be read and written to, without any special
  1871. provision.
  1872. BE CAREFUL! The first access to the environment happens quite early
  1873. in U-Boot initalization (when we try to get the setting of for the
  1874. console baudrate). You *MUST* have mapped your NVRAM area then, or
  1875. U-Boot will hang.
  1876. Please note that even with NVRAM we still use a copy of the
  1877. environment in RAM: we could work on NVRAM directly, but we want to
  1878. keep settings there always unmodified except somebody uses "saveenv"
  1879. to save the current settings.
  1880. - CONFIG_ENV_IS_IN_EEPROM:
  1881. Use this if you have an EEPROM or similar serial access
  1882. device and a driver for it.
  1883. - CONFIG_ENV_OFFSET:
  1884. - CONFIG_ENV_SIZE:
  1885. These two #defines specify the offset and size of the
  1886. environment area within the total memory of your EEPROM.
  1887. - CONFIG_SYS_I2C_EEPROM_ADDR:
  1888. If defined, specified the chip address of the EEPROM device.
  1889. The default address is zero.
  1890. - CONFIG_SYS_EEPROM_PAGE_WRITE_BITS:
  1891. If defined, the number of bits used to address bytes in a
  1892. single page in the EEPROM device. A 64 byte page, for example
  1893. would require six bits.
  1894. - CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS:
  1895. If defined, the number of milliseconds to delay between
  1896. page writes. The default is zero milliseconds.
  1897. - CONFIG_SYS_I2C_EEPROM_ADDR_LEN:
  1898. The length in bytes of the EEPROM memory array address. Note
  1899. that this is NOT the chip address length!
  1900. - CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW:
  1901. EEPROM chips that implement "address overflow" are ones
  1902. like Catalyst 24WC04/08/16 which has 9/10/11 bits of
  1903. address and the extra bits end up in the "chip address" bit
  1904. slots. This makes a 24WC08 (1Kbyte) chip look like four 256
  1905. byte chips.
  1906. Note that we consider the length of the address field to
  1907. still be one byte because the extra address bits are hidden
  1908. in the chip address.
  1909. - CONFIG_SYS_EEPROM_SIZE:
  1910. The size in bytes of the EEPROM device.
  1911. - CONFIG_ENV_EEPROM_IS_ON_I2C
  1912. define this, if you have I2C and SPI activated, and your
  1913. EEPROM, which holds the environment, is on the I2C bus.
  1914. - CONFIG_I2C_ENV_EEPROM_BUS
  1915. if you have an Environment on an EEPROM reached over
  1916. I2C muxes, you can define here, how to reach this
  1917. EEPROM. For example:
  1918. #define CONFIG_I2C_ENV_EEPROM_BUS "pca9547:70:d\0"
  1919. EEPROM which holds the environment, is reached over
  1920. a pca9547 i2c mux with address 0x70, channel 3.
  1921. - CONFIG_ENV_IS_IN_DATAFLASH:
  1922. Define this if you have a DataFlash memory device which you
  1923. want to use for the environment.
  1924. - CONFIG_ENV_OFFSET:
  1925. - CONFIG_ENV_ADDR:
  1926. - CONFIG_ENV_SIZE:
  1927. These three #defines specify the offset and size of the
  1928. environment area within the total memory of your DataFlash placed
  1929. at the specified address.
  1930. - CONFIG_ENV_IS_IN_NAND:
  1931. Define this if you have a NAND device which you want to use
  1932. for the environment.
  1933. - CONFIG_ENV_OFFSET:
  1934. - CONFIG_ENV_SIZE:
  1935. These two #defines specify the offset and size of the environment
  1936. area within the first NAND device.
  1937. - CONFIG_ENV_OFFSET_REDUND
  1938. This setting describes a second storage area of CONFIG_ENV_SIZE
  1939. size used to hold a redundant copy of the environment data,
  1940. so that there is a valid backup copy in case there is a
  1941. power failure during a "saveenv" operation.
  1942. Note: CONFIG_ENV_OFFSET and CONFIG_ENV_OFFSET_REDUND must be aligned
  1943. to a block boundary, and CONFIG_ENV_SIZE must be a multiple of
  1944. the NAND devices block size.
  1945. - CONFIG_NAND_ENV_DST
  1946. Defines address in RAM to which the nand_spl code should copy the
  1947. environment. If redundant environment is used, it will be copied to
  1948. CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE.
  1949. - CONFIG_SYS_SPI_INIT_OFFSET
  1950. Defines offset to the initial SPI buffer area in DPRAM. The
  1951. area is used at an early stage (ROM part) if the environment
  1952. is configured to reside in the SPI EEPROM: We need a 520 byte
  1953. scratch DPRAM area. It is used between the two initialization
  1954. calls (spi_init_f() and spi_init_r()). A value of 0xB00 seems
  1955. to be a good choice since it makes it far enough from the
  1956. start of the data area as well as from the stack pointer.
  1957. Please note that the environment is read-only until the monitor
  1958. has been relocated to RAM and a RAM copy of the environment has been
  1959. created; also, when using EEPROM you will have to use getenv_r()
  1960. until then to read environment variables.
  1961. The environment is protected by a CRC32 checksum. Before the monitor
  1962. is relocated into RAM, as a result of a bad CRC you will be working
  1963. with the compiled-in default environment - *silently*!!! [This is
  1964. necessary, because the first environment variable we need is the
  1965. "baudrate" setting for the console - if we have a bad CRC, we don't
  1966. have any device yet where we could complain.]
  1967. Note: once the monitor has been relocated, then it will complain if
  1968. the default environment is used; a new CRC is computed as soon as you
  1969. use the "saveenv" command to store a valid environment.
  1970. - CONFIG_SYS_FAULT_ECHO_LINK_DOWN:
  1971. Echo the inverted Ethernet link state to the fault LED.
  1972. Note: If this option is active, then CONFIG_SYS_FAULT_MII_ADDR
  1973. also needs to be defined.
  1974. - CONFIG_SYS_FAULT_MII_ADDR:
  1975. MII address of the PHY to check for the Ethernet link state.
  1976. - CONFIG_NS16550_MIN_FUNCTIONS:
  1977. Define this if you desire to only have use of the NS16550_init
  1978. and NS16550_putc functions for the serial driver located at
  1979. drivers/serial/ns16550.c. This option is useful for saving
  1980. space for already greatly restricted images, including but not
  1981. limited to NAND_SPL configurations.
  1982. Low Level (hardware related) configuration options:
  1983. ---------------------------------------------------
  1984. - CONFIG_SYS_CACHELINE_SIZE:
  1985. Cache Line Size of the CPU.
  1986. - CONFIG_SYS_DEFAULT_IMMR:
  1987. Default address of the IMMR after system reset.
  1988. Needed on some 8260 systems (MPC8260ADS, PQ2FADS-ZU,
  1989. and RPXsuper) to be able to adjust the position of
  1990. the IMMR register after a reset.
  1991. - Floppy Disk Support:
  1992. CONFIG_SYS_FDC_DRIVE_NUMBER
  1993. the default drive number (default value 0)
  1994. CONFIG_SYS_ISA_IO_STRIDE
  1995. defines the spacing between FDC chipset registers
  1996. (default value 1)
  1997. CONFIG_SYS_ISA_IO_OFFSET
  1998. defines the offset of register from address. It
  1999. depends on which part of the data bus is connected to
  2000. the FDC chipset. (default value 0)
  2001. If CONFIG_SYS_ISA_IO_STRIDE CONFIG_SYS_ISA_IO_OFFSET and
  2002. CONFIG_SYS_FDC_DRIVE_NUMBER are undefined, they take their
  2003. default value.
  2004. if CONFIG_SYS_FDC_HW_INIT is defined, then the function
  2005. fdc_hw_init() is called at the beginning of the FDC
  2006. setup. fdc_hw_init() must be provided by the board
  2007. source code. It is used to make hardware dependant
  2008. initializations.
  2009. - CONFIG_SYS_IMMR: Physical address of the Internal Memory.
  2010. DO NOT CHANGE unless you know exactly what you're
  2011. doing! (11-4) [MPC8xx/82xx systems only]
  2012. - CONFIG_SYS_INIT_RAM_ADDR:
  2013. Start address of memory area that can be used for
  2014. initial data and stack; please note that this must be
  2015. writable memory that is working WITHOUT special
  2016. initialization, i. e. you CANNOT use normal RAM which
  2017. will become available only after programming the
  2018. memory controller and running certain initialization
  2019. sequences.
  2020. U-Boot uses the following memory types:
  2021. - MPC8xx and MPC8260: IMMR (internal memory of the CPU)
  2022. - MPC824X: data cache
  2023. - PPC4xx: data cache
  2024. - CONFIG_SYS_GBL_DATA_OFFSET:
  2025. Offset of the initial data structure in the memory
  2026. area defined by CONFIG_SYS_INIT_RAM_ADDR. Usually
  2027. CONFIG_SYS_GBL_DATA_OFFSET is chosen such that the initial
  2028. data is located at the end of the available space
  2029. (sometimes written as (CONFIG_SYS_INIT_RAM_END -
  2030. CONFIG_SYS_INIT_DATA_SIZE), and the initial stack is just
  2031. below that area (growing from (CONFIG_SYS_INIT_RAM_ADDR +
  2032. CONFIG_SYS_GBL_DATA_OFFSET) downward.
  2033. Note:
  2034. On the MPC824X (or other systems that use the data
  2035. cache for initial memory) the address chosen for
  2036. CONFIG_SYS_INIT_RAM_ADDR is basically arbitrary - it must
  2037. point to an otherwise UNUSED address space between
  2038. the top of RAM and the start of the PCI space.
  2039. - CONFIG_SYS_SIUMCR: SIU Module Configuration (11-6)
  2040. - CONFIG_SYS_SYPCR: System Protection Control (11-9)
  2041. - CONFIG_SYS_TBSCR: Time Base Status and Control (11-26)
  2042. - CONFIG_SYS_PISCR: Periodic Interrupt Status and Control (11-31)
  2043. - CONFIG_SYS_PLPRCR: PLL, Low-Power, and Reset Control Register (15-30)
  2044. - CONFIG_SYS_SCCR: System Clock and reset Control Register (15-27)
  2045. - CONFIG_SYS_OR_TIMING_SDRAM:
  2046. SDRAM timing
  2047. - CONFIG_SYS_MAMR_PTA:
  2048. periodic timer for refresh
  2049. - CONFIG_SYS_DER: Debug Event Register (37-47)
  2050. - FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CONFIG_SYS_REMAP_OR_AM,
  2051. CONFIG_SYS_PRELIM_OR_AM, CONFIG_SYS_OR_TIMING_FLASH, CONFIG_SYS_OR0_REMAP,
  2052. CONFIG_SYS_OR0_PRELIM, CONFIG_SYS_BR0_PRELIM, CONFIG_SYS_OR1_REMAP, CONFIG_SYS_OR1_PRELIM,
  2053. CONFIG_SYS_BR1_PRELIM:
  2054. Memory Controller Definitions: BR0/1 and OR0/1 (FLASH)
  2055. - SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE,
  2056. CONFIG_SYS_OR_TIMING_SDRAM, CONFIG_SYS_OR2_PRELIM, CONFIG_SYS_BR2_PRELIM,
  2057. CONFIG_SYS_OR3_PRELIM, CONFIG_SYS_BR3_PRELIM:
  2058. Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM)
  2059. - CONFIG_SYS_MAMR_PTA, CONFIG_SYS_MPTPR_2BK_4K, CONFIG_SYS_MPTPR_1BK_4K, CONFIG_SYS_MPTPR_2BK_8K,
  2060. CONFIG_SYS_MPTPR_1BK_8K, CONFIG_SYS_MAMR_8COL, CONFIG_SYS_MAMR_9COL:
  2061. Machine Mode Register and Memory Periodic Timer
  2062. Prescaler definitions (SDRAM timing)
  2063. - CONFIG_SYS_I2C_UCODE_PATCH, CONFIG_SYS_I2C_DPMEM_OFFSET [0x1FC0]:
  2064. enable I2C microcode relocation patch (MPC8xx);
  2065. define relocation offset in DPRAM [DSP2]
  2066. - CONFIG_SYS_SMC_UCODE_PATCH, CONFIG_SYS_SMC_DPMEM_OFFSET [0x1FC0]:
  2067. enable SMC microcode relocation patch (MPC8xx);
  2068. define relocation offset in DPRAM [SMC1]
  2069. - CONFIG_SYS_SPI_UCODE_PATCH, CONFIG_SYS_SPI_DPMEM_OFFSET [0x1FC0]:
  2070. enable SPI microcode relocation patch (MPC8xx);
  2071. define relocation offset in DPRAM [SCC4]
  2072. - CONFIG_SYS_USE_OSCCLK:
  2073. Use OSCM clock mode on MBX8xx board. Be careful,
  2074. wrong setting might damage your board. Read
  2075. doc/README.MBX before setting this variable!
  2076. - CONFIG_SYS_CPM_POST_WORD_ADDR: (MPC8xx, MPC8260 only)
  2077. Offset of the bootmode word in DPRAM used by post
  2078. (Power On Self Tests). This definition overrides
  2079. #define'd default value in commproc.h resp.
  2080. cpm_8260.h.
  2081. - CONFIG_SYS_PCI_SLV_MEM_LOCAL, CONFIG_SYS_PCI_SLV_MEM_BUS, CONFIG_SYS_PICMR0_MASK_ATTRIB,
  2082. CONFIG_SYS_PCI_MSTR0_LOCAL, CONFIG_SYS_PCIMSK0_MASK, CONFIG_SYS_PCI_MSTR1_LOCAL,
  2083. CONFIG_SYS_PCIMSK1_MASK, CONFIG_SYS_PCI_MSTR_MEM_LOCAL, CONFIG_SYS_PCI_MSTR_MEM_BUS,
  2084. CONFIG_SYS_CPU_PCI_MEM_START, CONFIG_SYS_PCI_MSTR_MEM_SIZE, CONFIG_SYS_POCMR0_MASK_ATTRIB,
  2085. CONFIG_SYS_PCI_MSTR_MEMIO_LOCAL, CONFIG_SYS_PCI_MSTR_MEMIO_BUS, CPU_PCI_MEMIO_START,
  2086. CONFIG_SYS_PCI_MSTR_MEMIO_SIZE, CONFIG_SYS_POCMR1_MASK_ATTRIB, CONFIG_SYS_PCI_MSTR_IO_LOCAL,
  2087. CONFIG_SYS_PCI_MSTR_IO_BUS, CONFIG_SYS_CPU_PCI_IO_START, CONFIG_SYS_PCI_MSTR_IO_SIZE,
  2088. CONFIG_SYS_POCMR2_MASK_ATTRIB: (MPC826x only)
  2089. Overrides the default PCI memory map in arch/powerpc/cpu/mpc8260/pci.c if set.
  2090. - CONFIG_PCI_DISABLE_PCIE:
  2091. Disable PCI-Express on systems where it is supported but not
  2092. required.
  2093. - CONFIG_SPD_EEPROM
  2094. Get DDR timing information from an I2C EEPROM. Common
  2095. with pluggable memory modules such as SODIMMs
  2096. SPD_EEPROM_ADDRESS
  2097. I2C address of the SPD EEPROM
  2098. - CONFIG_SYS_SPD_BUS_NUM
  2099. If SPD EEPROM is on an I2C bus other than the first
  2100. one, specify here. Note that the value must resolve
  2101. to something your driver can deal with.
  2102. - CONFIG_SYS_83XX_DDR_USES_CS0
  2103. Only for 83xx systems. If specified, then DDR should
  2104. be configured using CS0 and CS1 instead of CS2 and CS3.
  2105. - CONFIG_ETHER_ON_FEC[12]
  2106. Define to enable FEC[12] on a 8xx series processor.
  2107. - CONFIG_FEC[12]_PHY
  2108. Define to the hardcoded PHY address which corresponds
  2109. to the given FEC; i. e.
  2110. #define CONFIG_FEC1_PHY 4
  2111. means that the PHY with address 4 is connected to FEC1
  2112. When set to -1, means to probe for first available.
  2113. - CONFIG_FEC[12]_PHY_NORXERR
  2114. The PHY does not have a RXERR line (RMII only).
  2115. (so program the FEC to ignore it).
  2116. - CONFIG_RMII
  2117. Enable RMII mode for all FECs.
  2118. Note that this is a global option, we can't
  2119. have one FEC in standard MII mode and another in RMII mode.
  2120. - CONFIG_CRC32_VERIFY
  2121. Add a verify option to the crc32 command.
  2122. The syntax is:
  2123. => crc32 -v <address> <count> <crc32>
  2124. Where address/count indicate a memory area
  2125. and crc32 is the correct crc32 which the
  2126. area should have.
  2127. - CONFIG_LOOPW
  2128. Add the "loopw" memory command. This only takes effect if
  2129. the memory commands are activated globally (CONFIG_CMD_MEM).
  2130. - CONFIG_MX_CYCLIC
  2131. Add the "mdc" and "mwc" memory commands. These are cyclic
  2132. "md/mw" commands.
  2133. Examples:
  2134. => mdc.b 10 4 500
  2135. This command will print 4 bytes (10,11,12,13) each 500 ms.
  2136. => mwc.l 100 12345678 10
  2137. This command will write 12345678 to address 100 all 10 ms.
  2138. This only takes effect if the memory commands are activated
  2139. globally (CONFIG_CMD_MEM).
  2140. - CONFIG_SKIP_LOWLEVEL_INIT
  2141. - CONFIG_SKIP_RELOCATE_UBOOT
  2142. [ARM only] If these variables are defined, then
  2143. certain low level initializations (like setting up
  2144. the memory controller) are omitted and/or U-Boot does
  2145. not relocate itself into RAM.
  2146. Normally these variables MUST NOT be defined. The
  2147. only exception is when U-Boot is loaded (to RAM) by
  2148. some other boot loader or by a debugger which
  2149. performs these initializations itself.
  2150. - CONFIG_PRELOADER
  2151. Modifies the behaviour of start.S when compiling a loader
  2152. that is executed before the actual U-Boot. E.g. when
  2153. compiling a NAND SPL.
  2154. Building the Software:
  2155. ======================
  2156. Building U-Boot has been tested in several native build environments
  2157. and in many different cross environments. Of course we cannot support
  2158. all possibly existing versions of cross development tools in all
  2159. (potentially obsolete) versions. In case of tool chain problems we
  2160. recommend to use the ELDK (see http://www.denx.de/wiki/DULG/ELDK)
  2161. which is extensively used to build and test U-Boot.
  2162. If you are not using a native environment, it is assumed that you
  2163. have GNU cross compiling tools available in your path. In this case,
  2164. you must set the environment variable CROSS_COMPILE in your shell.
  2165. Note that no changes to the Makefile or any other source files are
  2166. necessary. For example using the ELDK on a 4xx CPU, please enter:
  2167. $ CROSS_COMPILE=ppc_4xx-
  2168. $ export CROSS_COMPILE
  2169. Note: If you wish to generate Windows versions of the utilities in
  2170. the tools directory you can use the MinGW toolchain
  2171. (http://www.mingw.org). Set your HOST tools to the MinGW
  2172. toolchain and execute 'make tools'. For example:
  2173. $ make HOSTCC=i586-mingw32msvc-gcc HOSTSTRIP=i586-mingw32msvc-strip tools
  2174. Binaries such as tools/mkimage.exe will be created which can
  2175. be executed on computers running Windows.
  2176. U-Boot is intended to be simple to build. After installing the
  2177. sources you must configure U-Boot for one specific board type. This
  2178. is done by typing:
  2179. make NAME_config
  2180. where "NAME_config" is the name of one of the existing configu-
  2181. rations; see the main Makefile for supported names.
  2182. Note: for some board special configuration names may exist; check if
  2183. additional information is available from the board vendor; for
  2184. instance, the TQM823L systems are available without (standard)
  2185. or with LCD support. You can select such additional "features"
  2186. when choosing the configuration, i. e.
  2187. make TQM823L_config
  2188. - will configure for a plain TQM823L, i. e. no LCD support
  2189. make TQM823L_LCD_config
  2190. - will configure for a TQM823L with U-Boot console on LCD
  2191. etc.
  2192. Finally, type "make all", and you should get some working U-Boot
  2193. images ready for download to / installation on your system:
  2194. - "u-boot.bin" is a raw binary image
  2195. - "u-boot" is an image in ELF binary format
  2196. - "u-boot.srec" is in Motorola S-Record format
  2197. By default the build is performed locally and the objects are saved
  2198. in the source directory. One of the two methods can be used to change
  2199. this behavior and build U-Boot to some external directory:
  2200. 1. Add O= to the make command line invocations:
  2201. make O=/tmp/build distclean
  2202. make O=/tmp/build NAME_config
  2203. make O=/tmp/build all
  2204. 2. Set environment variable BUILD_DIR to point to the desired location:
  2205. export BUILD_DIR=/tmp/build
  2206. make distclean
  2207. make NAME_config
  2208. make all
  2209. Note that the command line "O=" setting overrides the BUILD_DIR environment
  2210. variable.
  2211. Please be aware that the Makefiles assume you are using GNU make, so
  2212. for instance on NetBSD you might need to use "gmake" instead of
  2213. native "make".
  2214. If the system board that you have is not listed, then you will need
  2215. to port U-Boot to your hardware platform. To do this, follow these
  2216. steps:
  2217. 1. Add a new configuration option for your board to the toplevel
  2218. "Makefile" and to the "MAKEALL" script, using the existing
  2219. entries as examples. Note that here and at many other places
  2220. boards and other names are listed in alphabetical sort order. Please
  2221. keep this order.
  2222. 2. Create a new directory to hold your board specific code. Add any
  2223. files you need. In your board directory, you will need at least
  2224. the "Makefile", a "<board>.c", "flash.c" and "u-boot.lds".
  2225. 3. Create a new configuration file "include/configs/<board>.h" for
  2226. your board
  2227. 3. If you're porting U-Boot to a new CPU, then also create a new
  2228. directory to hold your CPU specific code. Add any files you need.
  2229. 4. Run "make <board>_config" with your new name.
  2230. 5. Type "make", and you should get a working "u-boot.srec" file
  2231. to be installed on your target system.
  2232. 6. Debug and solve any problems that might arise.
  2233. [Of course, this last step is much harder than it sounds.]
  2234. Testing of U-Boot Modifications, Ports to New Hardware, etc.:
  2235. ==============================================================
  2236. If you have modified U-Boot sources (for instance added a new board
  2237. or support for new devices, a new CPU, etc.) you are expected to
  2238. provide feedback to the other developers. The feedback normally takes
  2239. the form of a "patch", i. e. a context diff against a certain (latest
  2240. official or latest in the git repository) version of U-Boot sources.
  2241. But before you submit such a patch, please verify that your modifi-
  2242. cation did not break existing code. At least make sure that *ALL* of
  2243. the supported boards compile WITHOUT ANY compiler warnings. To do so,
  2244. just run the "MAKEALL" script, which will configure and build U-Boot
  2245. for ALL supported system. Be warned, this will take a while. You can
  2246. select which (cross) compiler to use by passing a `CROSS_COMPILE'
  2247. environment variable to the script, i. e. to use the ELDK cross tools
  2248. you can type
  2249. CROSS_COMPILE=ppc_8xx- MAKEALL
  2250. or to build on a native PowerPC system you can type
  2251. CROSS_COMPILE=' ' MAKEALL
  2252. When using the MAKEALL script, the default behaviour is to build
  2253. U-Boot in the source directory. This location can be changed by
  2254. setting the BUILD_DIR environment variable. Also, for each target
  2255. built, the MAKEALL script saves two log files (<target>.ERR and
  2256. <target>.MAKEALL) in the <source dir>/LOG directory. This default
  2257. location can be changed by setting the MAKEALL_LOGDIR environment
  2258. variable. For example:
  2259. export BUILD_DIR=/tmp/build
  2260. export MAKEALL_LOGDIR=/tmp/log
  2261. CROSS_COMPILE=ppc_8xx- MAKEALL
  2262. With the above settings build objects are saved in the /tmp/build,
  2263. log files are saved in the /tmp/log and the source tree remains clean
  2264. during the whole build process.
  2265. See also "U-Boot Porting Guide" below.
  2266. Monitor Commands - Overview:
  2267. ============================
  2268. go - start application at address 'addr'
  2269. run - run commands in an environment variable
  2270. bootm - boot application image from memory
  2271. bootp - boot image via network using BootP/TFTP protocol
  2272. tftpboot- boot image via network using TFTP protocol
  2273. and env variables "ipaddr" and "serverip"
  2274. (and eventually "gatewayip")
  2275. rarpboot- boot image via network using RARP/TFTP protocol
  2276. diskboot- boot from IDE devicebootd - boot default, i.e., run 'bootcmd'
  2277. loads - load S-Record file over serial line
  2278. loadb - load binary file over serial line (kermit mode)
  2279. md - memory display
  2280. mm - memory modify (auto-incrementing)
  2281. nm - memory modify (constant address)
  2282. mw - memory write (fill)
  2283. cp - memory copy
  2284. cmp - memory compare
  2285. crc32 - checksum calculation
  2286. i2c - I2C sub-system
  2287. sspi - SPI utility commands
  2288. base - print or set address offset
  2289. printenv- print environment variables
  2290. setenv - set environment variables
  2291. saveenv - save environment variables to persistent storage
  2292. protect - enable or disable FLASH write protection
  2293. erase - erase FLASH memory
  2294. flinfo - print FLASH memory information
  2295. bdinfo - print Board Info structure
  2296. iminfo - print header information for application image
  2297. coninfo - print console devices and informations
  2298. ide - IDE sub-system
  2299. loop - infinite loop on address range
  2300. loopw - infinite write loop on address range
  2301. mtest - simple RAM test
  2302. icache - enable or disable instruction cache
  2303. dcache - enable or disable data cache
  2304. reset - Perform RESET of the CPU
  2305. echo - echo args to console
  2306. version - print monitor version
  2307. help - print online help
  2308. ? - alias for 'help'
  2309. Monitor Commands - Detailed Description:
  2310. ========================================
  2311. TODO.
  2312. For now: just type "help <command>".
  2313. Environment Variables:
  2314. ======================
  2315. U-Boot supports user configuration using Environment Variables which
  2316. can be made persistent by saving to Flash memory.
  2317. Environment Variables are set using "setenv", printed using
  2318. "printenv", and saved to Flash using "saveenv". Using "setenv"
  2319. without a value can be used to delete a variable from the
  2320. environment. As long as you don't save the environment you are
  2321. working with an in-memory copy. In case the Flash area containing the
  2322. environment is erased by accident, a default environment is provided.
  2323. Some configuration options can be set using Environment Variables.
  2324. List of environment variables (most likely not complete):
  2325. baudrate - see CONFIG_BAUDRATE
  2326. bootdelay - see CONFIG_BOOTDELAY
  2327. bootcmd - see CONFIG_BOOTCOMMAND
  2328. bootargs - Boot arguments when booting an RTOS image
  2329. bootfile - Name of the image to load with TFTP
  2330. bootm_low - Memory range available for image processing in the bootm
  2331. command can be restricted. This variable is given as
  2332. a hexadecimal number and defines lowest address allowed
  2333. for use by the bootm command. See also "bootm_size"
  2334. environment variable. Address defined by "bootm_low" is
  2335. also the base of the initial memory mapping for the Linux
  2336. kernel -- see the description of CONFIG_SYS_BOOTMAPSZ.
  2337. bootm_size - Memory range available for image processing in the bootm
  2338. command can be restricted. This variable is given as
  2339. a hexadecimal number and defines the size of the region
  2340. allowed for use by the bootm command. See also "bootm_low"
  2341. environment variable.
  2342. updatefile - Location of the software update file on a TFTP server, used
  2343. by the automatic software update feature. Please refer to
  2344. documentation in doc/README.update for more details.
  2345. autoload - if set to "no" (any string beginning with 'n'),
  2346. "bootp" will just load perform a lookup of the
  2347. configuration from the BOOTP server, but not try to
  2348. load any image using TFTP
  2349. autostart - if set to "yes", an image loaded using the "bootp",
  2350. "rarpboot", "tftpboot" or "diskboot" commands will
  2351. be automatically started (by internally calling
  2352. "bootm")
  2353. If set to "no", a standalone image passed to the
  2354. "bootm" command will be copied to the load address
  2355. (and eventually uncompressed), but NOT be started.
  2356. This can be used to load and uncompress arbitrary
  2357. data.
  2358. i2cfast - (PPC405GP|PPC405EP only)
  2359. if set to 'y' configures Linux I2C driver for fast
  2360. mode (400kHZ). This environment variable is used in
  2361. initialization code. So, for changes to be effective
  2362. it must be saved and board must be reset.
  2363. initrd_high - restrict positioning of initrd images:
  2364. If this variable is not set, initrd images will be
  2365. copied to the highest possible address in RAM; this
  2366. is usually what you want since it allows for
  2367. maximum initrd size. If for some reason you want to
  2368. make sure that the initrd image is loaded below the
  2369. CONFIG_SYS_BOOTMAPSZ limit, you can set this environment
  2370. variable to a value of "no" or "off" or "0".
  2371. Alternatively, you can set it to a maximum upper
  2372. address to use (U-Boot will still check that it
  2373. does not overwrite the U-Boot stack and data).
  2374. For instance, when you have a system with 16 MB
  2375. RAM, and want to reserve 4 MB from use by Linux,
  2376. you can do this by adding "mem=12M" to the value of
  2377. the "bootargs" variable. However, now you must make
  2378. sure that the initrd image is placed in the first
  2379. 12 MB as well - this can be done with
  2380. setenv initrd_high 00c00000
  2381. If you set initrd_high to 0xFFFFFFFF, this is an
  2382. indication to U-Boot that all addresses are legal
  2383. for the Linux kernel, including addresses in flash
  2384. memory. In this case U-Boot will NOT COPY the
  2385. ramdisk at all. This may be useful to reduce the
  2386. boot time on your system, but requires that this
  2387. feature is supported by your Linux kernel.
  2388. ipaddr - IP address; needed for tftpboot command
  2389. loadaddr - Default load address for commands like "bootp",
  2390. "rarpboot", "tftpboot", "loadb" or "diskboot"
  2391. loads_echo - see CONFIG_LOADS_ECHO
  2392. serverip - TFTP server IP address; needed for tftpboot command
  2393. bootretry - see CONFIG_BOOT_RETRY_TIME
  2394. bootdelaykey - see CONFIG_AUTOBOOT_DELAY_STR
  2395. bootstopkey - see CONFIG_AUTOBOOT_STOP_STR
  2396. ethprime - When CONFIG_NET_MULTI is enabled controls which
  2397. interface is used first.
  2398. ethact - When CONFIG_NET_MULTI is enabled controls which
  2399. interface is currently active. For example you
  2400. can do the following
  2401. => setenv ethact FEC ETHERNET
  2402. => ping 192.168.0.1 # traffic sent on FEC ETHERNET
  2403. => setenv ethact SCC ETHERNET
  2404. => ping 10.0.0.1 # traffic sent on SCC ETHERNET
  2405. ethrotate - When set to "no" U-Boot does not go through all
  2406. available network interfaces.
  2407. It just stays at the currently selected interface.
  2408. netretry - When set to "no" each network operation will
  2409. either succeed or fail without retrying.
  2410. When set to "once" the network operation will
  2411. fail when all the available network interfaces
  2412. are tried once without success.
  2413. Useful on scripts which control the retry operation
  2414. themselves.
  2415. npe_ucode - set load address for the NPE microcode
  2416. tftpsrcport - If this is set, the value is used for TFTP's
  2417. UDP source port.
  2418. tftpdstport - If this is set, the value is used for TFTP's UDP
  2419. destination port instead of the Well Know Port 69.
  2420. tftpblocksize - Block size to use for TFTP transfers; if not set,
  2421. we use the TFTP server's default block size
  2422. tftptimeout - Retransmission timeout for TFTP packets (in milli-
  2423. seconds, minimum value is 1000 = 1 second). Defines
  2424. when a packet is considered to be lost so it has to
  2425. be retransmitted. The default is 5000 = 5 seconds.
  2426. Lowering this value may make downloads succeed
  2427. faster in networks with high packet loss rates or
  2428. with unreliable TFTP servers.
  2429. vlan - When set to a value < 4095 the traffic over
  2430. Ethernet is encapsulated/received over 802.1q
  2431. VLAN tagged frames.
  2432. The following environment variables may be used and automatically
  2433. updated by the network boot commands ("bootp" and "rarpboot"),
  2434. depending the information provided by your boot server:
  2435. bootfile - see above
  2436. dnsip - IP address of your Domain Name Server
  2437. dnsip2 - IP address of your secondary Domain Name Server
  2438. gatewayip - IP address of the Gateway (Router) to use
  2439. hostname - Target hostname
  2440. ipaddr - see above
  2441. netmask - Subnet Mask
  2442. rootpath - Pathname of the root filesystem on the NFS server
  2443. serverip - see above
  2444. There are two special Environment Variables:
  2445. serial# - contains hardware identification information such
  2446. as type string and/or serial number
  2447. ethaddr - Ethernet address
  2448. These variables can be set only once (usually during manufacturing of
  2449. the board). U-Boot refuses to delete or overwrite these variables
  2450. once they have been set once.
  2451. Further special Environment Variables:
  2452. ver - Contains the U-Boot version string as printed
  2453. with the "version" command. This variable is
  2454. readonly (see CONFIG_VERSION_VARIABLE).
  2455. Please note that changes to some configuration parameters may take
  2456. only effect after the next boot (yes, that's just like Windoze :-).
  2457. Command Line Parsing:
  2458. =====================
  2459. There are two different command line parsers available with U-Boot:
  2460. the old "simple" one, and the much more powerful "hush" shell:
  2461. Old, simple command line parser:
  2462. --------------------------------
  2463. - supports environment variables (through setenv / saveenv commands)
  2464. - several commands on one line, separated by ';'
  2465. - variable substitution using "... ${name} ..." syntax
  2466. - special characters ('$', ';') can be escaped by prefixing with '\',
  2467. for example:
  2468. setenv bootcmd bootm \${address}
  2469. - You can also escape text by enclosing in single apostrophes, for example:
  2470. setenv addip 'setenv bootargs $bootargs ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname::off'
  2471. Hush shell:
  2472. -----------
  2473. - similar to Bourne shell, with control structures like
  2474. if...then...else...fi, for...do...done; while...do...done,
  2475. until...do...done, ...
  2476. - supports environment ("global") variables (through setenv / saveenv
  2477. commands) and local shell variables (through standard shell syntax
  2478. "name=value"); only environment variables can be used with "run"
  2479. command
  2480. General rules:
  2481. --------------
  2482. (1) If a command line (or an environment variable executed by a "run"
  2483. command) contains several commands separated by semicolon, and
  2484. one of these commands fails, then the remaining commands will be
  2485. executed anyway.
  2486. (2) If you execute several variables with one call to run (i. e.
  2487. calling run with a list of variables as arguments), any failing
  2488. command will cause "run" to terminate, i. e. the remaining
  2489. variables are not executed.
  2490. Note for Redundant Ethernet Interfaces:
  2491. =======================================
  2492. Some boards come with redundant Ethernet interfaces; U-Boot supports
  2493. such configurations and is capable of automatic selection of a
  2494. "working" interface when needed. MAC assignment works as follows:
  2495. Network interfaces are numbered eth0, eth1, eth2, ... Corresponding
  2496. MAC addresses can be stored in the environment as "ethaddr" (=>eth0),
  2497. "eth1addr" (=>eth1), "eth2addr", ...
  2498. If the network interface stores some valid MAC address (for instance
  2499. in SROM), this is used as default address if there is NO correspon-
  2500. ding setting in the environment; if the corresponding environment
  2501. variable is set, this overrides the settings in the card; that means:
  2502. o If the SROM has a valid MAC address, and there is no address in the
  2503. environment, the SROM's address is used.
  2504. o If there is no valid address in the SROM, and a definition in the
  2505. environment exists, then the value from the environment variable is
  2506. used.
  2507. o If both the SROM and the environment contain a MAC address, and
  2508. both addresses are the same, this MAC address is used.
  2509. o If both the SROM and the environment contain a MAC address, and the
  2510. addresses differ, the value from the environment is used and a
  2511. warning is printed.
  2512. o If neither SROM nor the environment contain a MAC address, an error
  2513. is raised.
  2514. Image Formats:
  2515. ==============
  2516. U-Boot is capable of booting (and performing other auxiliary operations on)
  2517. images in two formats:
  2518. New uImage format (FIT)
  2519. -----------------------
  2520. Flexible and powerful format based on Flattened Image Tree -- FIT (similar
  2521. to Flattened Device Tree). It allows the use of images with multiple
  2522. components (several kernels, ramdisks, etc.), with contents protected by
  2523. SHA1, MD5 or CRC32. More details are found in the doc/uImage.FIT directory.
  2524. Old uImage format
  2525. -----------------
  2526. Old image format is based on binary files which can be basically anything,
  2527. preceded by a special header; see the definitions in include/image.h for
  2528. details; basically, the header defines the following image properties:
  2529. * Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD,
  2530. 4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks,
  2531. LynxOS, pSOS, QNX, RTEMS, INTEGRITY;
  2532. Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, LynxOS,
  2533. INTEGRITY).
  2534. * Target CPU Architecture (Provisions for Alpha, ARM, AVR32, Intel x86,
  2535. IA64, MIPS, NIOS, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit;
  2536. Currently supported: ARM, AVR32, Intel x86, MIPS, NIOS, PowerPC).
  2537. * Compression Type (uncompressed, gzip, bzip2)
  2538. * Load Address
  2539. * Entry Point
  2540. * Image Name
  2541. * Image Timestamp
  2542. The header is marked by a special Magic Number, and both the header
  2543. and the data portions of the image are secured against corruption by
  2544. CRC32 checksums.
  2545. Linux Support:
  2546. ==============
  2547. Although U-Boot should support any OS or standalone application
  2548. easily, the main focus has always been on Linux during the design of
  2549. U-Boot.
  2550. U-Boot includes many features that so far have been part of some
  2551. special "boot loader" code within the Linux kernel. Also, any
  2552. "initrd" images to be used are no longer part of one big Linux image;
  2553. instead, kernel and "initrd" are separate images. This implementation
  2554. serves several purposes:
  2555. - the same features can be used for other OS or standalone
  2556. applications (for instance: using compressed images to reduce the
  2557. Flash memory footprint)
  2558. - it becomes much easier to port new Linux kernel versions because
  2559. lots of low-level, hardware dependent stuff are done by U-Boot
  2560. - the same Linux kernel image can now be used with different "initrd"
  2561. images; of course this also means that different kernel images can
  2562. be run with the same "initrd". This makes testing easier (you don't
  2563. have to build a new "zImage.initrd" Linux image when you just
  2564. change a file in your "initrd"). Also, a field-upgrade of the
  2565. software is easier now.
  2566. Linux HOWTO:
  2567. ============
  2568. Porting Linux to U-Boot based systems:
  2569. ---------------------------------------
  2570. U-Boot cannot save you from doing all the necessary modifications to
  2571. configure the Linux device drivers for use with your target hardware
  2572. (no, we don't intend to provide a full virtual machine interface to
  2573. Linux :-).
  2574. But now you can ignore ALL boot loader code (in arch/powerpc/mbxboot).
  2575. Just make sure your machine specific header file (for instance
  2576. include/asm-ppc/tqm8xx.h) includes the same definition of the Board
  2577. Information structure as we define in include/asm-<arch>/u-boot.h,
  2578. and make sure that your definition of IMAP_ADDR uses the same value
  2579. as your U-Boot configuration in CONFIG_SYS_IMMR.
  2580. Configuring the Linux kernel:
  2581. -----------------------------
  2582. No specific requirements for U-Boot. Make sure you have some root
  2583. device (initial ramdisk, NFS) for your target system.
  2584. Building a Linux Image:
  2585. -----------------------
  2586. With U-Boot, "normal" build targets like "zImage" or "bzImage" are
  2587. not used. If you use recent kernel source, a new build target
  2588. "uImage" will exist which automatically builds an image usable by
  2589. U-Boot. Most older kernels also have support for a "pImage" target,
  2590. which was introduced for our predecessor project PPCBoot and uses a
  2591. 100% compatible format.
  2592. Example:
  2593. make TQM850L_config
  2594. make oldconfig
  2595. make dep
  2596. make uImage
  2597. The "uImage" build target uses a special tool (in 'tools/mkimage') to
  2598. encapsulate a compressed Linux kernel image with header information,
  2599. CRC32 checksum etc. for use with U-Boot. This is what we are doing:
  2600. * build a standard "vmlinux" kernel image (in ELF binary format):
  2601. * convert the kernel into a raw binary image:
  2602. ${CROSS_COMPILE}-objcopy -O binary \
  2603. -R .note -R .comment \
  2604. -S vmlinux linux.bin
  2605. * compress the binary image:
  2606. gzip -9 linux.bin
  2607. * package compressed binary image for U-Boot:
  2608. mkimage -A ppc -O linux -T kernel -C gzip \
  2609. -a 0 -e 0 -n "Linux Kernel Image" \
  2610. -d linux.bin.gz uImage
  2611. The "mkimage" tool can also be used to create ramdisk images for use
  2612. with U-Boot, either separated from the Linux kernel image, or
  2613. combined into one file. "mkimage" encapsulates the images with a 64
  2614. byte header containing information about target architecture,
  2615. operating system, image type, compression method, entry points, time
  2616. stamp, CRC32 checksums, etc.
  2617. "mkimage" can be called in two ways: to verify existing images and
  2618. print the header information, or to build new images.
  2619. In the first form (with "-l" option) mkimage lists the information
  2620. contained in the header of an existing U-Boot image; this includes
  2621. checksum verification:
  2622. tools/mkimage -l image
  2623. -l ==> list image header information
  2624. The second form (with "-d" option) is used to build a U-Boot image
  2625. from a "data file" which is used as image payload:
  2626. tools/mkimage -A arch -O os -T type -C comp -a addr -e ep \
  2627. -n name -d data_file image
  2628. -A ==> set architecture to 'arch'
  2629. -O ==> set operating system to 'os'
  2630. -T ==> set image type to 'type'
  2631. -C ==> set compression type 'comp'
  2632. -a ==> set load address to 'addr' (hex)
  2633. -e ==> set entry point to 'ep' (hex)
  2634. -n ==> set image name to 'name'
  2635. -d ==> use image data from 'datafile'
  2636. Right now, all Linux kernels for PowerPC systems use the same load
  2637. address (0x00000000), but the entry point address depends on the
  2638. kernel version:
  2639. - 2.2.x kernels have the entry point at 0x0000000C,
  2640. - 2.3.x and later kernels have the entry point at 0x00000000.
  2641. So a typical call to build a U-Boot image would read:
  2642. -> tools/mkimage -n '2.4.4 kernel for TQM850L' \
  2643. > -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \
  2644. > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz \
  2645. > examples/uImage.TQM850L
  2646. Image Name: 2.4.4 kernel for TQM850L
  2647. Created: Wed Jul 19 02:34:59 2000
  2648. Image Type: PowerPC Linux Kernel Image (gzip compressed)
  2649. Data Size: 335725 Bytes = 327.86 kB = 0.32 MB
  2650. Load Address: 0x00000000
  2651. Entry Point: 0x00000000
  2652. To verify the contents of the image (or check for corruption):
  2653. -> tools/mkimage -l examples/uImage.TQM850L
  2654. Image Name: 2.4.4 kernel for TQM850L
  2655. Created: Wed Jul 19 02:34:59 2000
  2656. Image Type: PowerPC Linux Kernel Image (gzip compressed)
  2657. Data Size: 335725 Bytes = 327.86 kB = 0.32 MB
  2658. Load Address: 0x00000000
  2659. Entry Point: 0x00000000
  2660. NOTE: for embedded systems where boot time is critical you can trade
  2661. speed for memory and install an UNCOMPRESSED image instead: this
  2662. needs more space in Flash, but boots much faster since it does not
  2663. need to be uncompressed:
  2664. -> gunzip /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz
  2665. -> tools/mkimage -n '2.4.4 kernel for TQM850L' \
  2666. > -A ppc -O linux -T kernel -C none -a 0 -e 0 \
  2667. > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux \
  2668. > examples/uImage.TQM850L-uncompressed
  2669. Image Name: 2.4.4 kernel for TQM850L
  2670. Created: Wed Jul 19 02:34:59 2000
  2671. Image Type: PowerPC Linux Kernel Image (uncompressed)
  2672. Data Size: 792160 Bytes = 773.59 kB = 0.76 MB
  2673. Load Address: 0x00000000
  2674. Entry Point: 0x00000000
  2675. Similar you can build U-Boot images from a 'ramdisk.image.gz' file
  2676. when your kernel is intended to use an initial ramdisk:
  2677. -> tools/mkimage -n 'Simple Ramdisk Image' \
  2678. > -A ppc -O linux -T ramdisk -C gzip \
  2679. > -d /LinuxPPC/images/SIMPLE-ramdisk.image.gz examples/simple-initrd
  2680. Image Name: Simple Ramdisk Image
  2681. Created: Wed Jan 12 14:01:50 2000
  2682. Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
  2683. Data Size: 566530 Bytes = 553.25 kB = 0.54 MB
  2684. Load Address: 0x00000000
  2685. Entry Point: 0x00000000
  2686. Installing a Linux Image:
  2687. -------------------------
  2688. To downloading a U-Boot image over the serial (console) interface,
  2689. you must convert the image to S-Record format:
  2690. objcopy -I binary -O srec examples/image examples/image.srec
  2691. The 'objcopy' does not understand the information in the U-Boot
  2692. image header, so the resulting S-Record file will be relative to
  2693. address 0x00000000. To load it to a given address, you need to
  2694. specify the target address as 'offset' parameter with the 'loads'
  2695. command.
  2696. Example: install the image to address 0x40100000 (which on the
  2697. TQM8xxL is in the first Flash bank):
  2698. => erase 40100000 401FFFFF
  2699. .......... done
  2700. Erased 8 sectors
  2701. => loads 40100000
  2702. ## Ready for S-Record download ...
  2703. ~>examples/image.srec
  2704. 1 2 3 4 5 6 7 8 9 10 11 12 13 ...
  2705. ...
  2706. 15989 15990 15991 15992
  2707. [file transfer complete]
  2708. [connected]
  2709. ## Start Addr = 0x00000000
  2710. You can check the success of the download using the 'iminfo' command;
  2711. this includes a checksum verification so you can be sure no data
  2712. corruption happened:
  2713. => imi 40100000
  2714. ## Checking Image at 40100000 ...
  2715. Image Name: 2.2.13 for initrd on TQM850L
  2716. Image Type: PowerPC Linux Kernel Image (gzip compressed)
  2717. Data Size: 335725 Bytes = 327 kB = 0 MB
  2718. Load Address: 00000000
  2719. Entry Point: 0000000c
  2720. Verifying Checksum ... OK
  2721. Boot Linux:
  2722. -----------
  2723. The "bootm" command is used to boot an application that is stored in
  2724. memory (RAM or Flash). In case of a Linux kernel image, the contents
  2725. of the "bootargs" environment variable is passed to the kernel as
  2726. parameters. You can check and modify this variable using the
  2727. "printenv" and "setenv" commands:
  2728. => printenv bootargs
  2729. bootargs=root=/dev/ram
  2730. => setenv bootargs root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
  2731. => printenv bootargs
  2732. bootargs=root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
  2733. => bootm 40020000
  2734. ## Booting Linux kernel at 40020000 ...
  2735. Image Name: 2.2.13 for NFS on TQM850L
  2736. Image Type: PowerPC Linux Kernel Image (gzip compressed)
  2737. Data Size: 381681 Bytes = 372 kB = 0 MB
  2738. Load Address: 00000000
  2739. Entry Point: 0000000c
  2740. Verifying Checksum ... OK
  2741. Uncompressing Kernel Image ... OK
  2742. 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
  2743. Boot arguments: root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
  2744. time_init: decrementer frequency = 187500000/60
  2745. Calibrating delay loop... 49.77 BogoMIPS
  2746. Memory: 15208k available (700k kernel code, 444k data, 32k init) [c0000000,c1000000]
  2747. ...
  2748. If you want to boot a Linux kernel with initial RAM disk, you pass
  2749. the memory addresses of both the kernel and the initrd image (PPBCOOT
  2750. format!) to the "bootm" command:
  2751. => imi 40100000 40200000
  2752. ## Checking Image at 40100000 ...
  2753. Image Name: 2.2.13 for initrd on TQM850L
  2754. Image Type: PowerPC Linux Kernel Image (gzip compressed)
  2755. Data Size: 335725 Bytes = 327 kB = 0 MB
  2756. Load Address: 00000000
  2757. Entry Point: 0000000c
  2758. Verifying Checksum ... OK
  2759. ## Checking Image at 40200000 ...
  2760. Image Name: Simple Ramdisk Image
  2761. Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
  2762. Data Size: 566530 Bytes = 553 kB = 0 MB
  2763. Load Address: 00000000
  2764. Entry Point: 00000000
  2765. Verifying Checksum ... OK
  2766. => bootm 40100000 40200000
  2767. ## Booting Linux kernel at 40100000 ...
  2768. Image Name: 2.2.13 for initrd on TQM850L
  2769. Image Type: PowerPC Linux Kernel Image (gzip compressed)
  2770. Data Size: 335725 Bytes = 327 kB = 0 MB
  2771. Load Address: 00000000
  2772. Entry Point: 0000000c
  2773. Verifying Checksum ... OK
  2774. Uncompressing Kernel Image ... OK
  2775. ## Loading RAMDisk Image at 40200000 ...
  2776. Image Name: Simple Ramdisk Image
  2777. Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
  2778. Data Size: 566530 Bytes = 553 kB = 0 MB
  2779. Load Address: 00000000
  2780. Entry Point: 00000000
  2781. Verifying Checksum ... OK
  2782. Loading Ramdisk ... OK
  2783. 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
  2784. Boot arguments: root=/dev/ram
  2785. time_init: decrementer frequency = 187500000/60
  2786. Calibrating delay loop... 49.77 BogoMIPS
  2787. ...
  2788. RAMDISK: Compressed image found at block 0
  2789. VFS: Mounted root (ext2 filesystem).
  2790. bash#
  2791. Boot Linux and pass a flat device tree:
  2792. -----------
  2793. First, U-Boot must be compiled with the appropriate defines. See the section
  2794. titled "Linux Kernel Interface" above for a more in depth explanation. The
  2795. following is an example of how to start a kernel and pass an updated
  2796. flat device tree:
  2797. => print oftaddr
  2798. oftaddr=0x300000
  2799. => print oft
  2800. oft=oftrees/mpc8540ads.dtb
  2801. => tftp $oftaddr $oft
  2802. Speed: 1000, full duplex
  2803. Using TSEC0 device
  2804. TFTP from server 192.168.1.1; our IP address is 192.168.1.101
  2805. Filename 'oftrees/mpc8540ads.dtb'.
  2806. Load address: 0x300000
  2807. Loading: #
  2808. done
  2809. Bytes transferred = 4106 (100a hex)
  2810. => tftp $loadaddr $bootfile
  2811. Speed: 1000, full duplex
  2812. Using TSEC0 device
  2813. TFTP from server 192.168.1.1; our IP address is 192.168.1.2
  2814. Filename 'uImage'.
  2815. Load address: 0x200000
  2816. Loading:############
  2817. done
  2818. Bytes transferred = 1029407 (fb51f hex)
  2819. => print loadaddr
  2820. loadaddr=200000
  2821. => print oftaddr
  2822. oftaddr=0x300000
  2823. => bootm $loadaddr - $oftaddr
  2824. ## Booting image at 00200000 ...
  2825. Image Name: Linux-2.6.17-dirty
  2826. Image Type: PowerPC Linux Kernel Image (gzip compressed)
  2827. Data Size: 1029343 Bytes = 1005.2 kB
  2828. Load Address: 00000000
  2829. Entry Point: 00000000
  2830. Verifying Checksum ... OK
  2831. Uncompressing Kernel Image ... OK
  2832. Booting using flat device tree at 0x300000
  2833. Using MPC85xx ADS machine description
  2834. Memory CAM mapping: CAM0=256Mb, CAM1=256Mb, CAM2=0Mb residual: 0Mb
  2835. [snip]
  2836. More About U-Boot Image Types:
  2837. ------------------------------
  2838. U-Boot supports the following image types:
  2839. "Standalone Programs" are directly runnable in the environment
  2840. provided by U-Boot; it is expected that (if they behave
  2841. well) you can continue to work in U-Boot after return from
  2842. the Standalone Program.
  2843. "OS Kernel Images" are usually images of some Embedded OS which
  2844. will take over control completely. Usually these programs
  2845. will install their own set of exception handlers, device
  2846. drivers, set up the MMU, etc. - this means, that you cannot
  2847. expect to re-enter U-Boot except by resetting the CPU.
  2848. "RAMDisk Images" are more or less just data blocks, and their
  2849. parameters (address, size) are passed to an OS kernel that is
  2850. being started.
  2851. "Multi-File Images" contain several images, typically an OS
  2852. (Linux) kernel image and one or more data images like
  2853. RAMDisks. This construct is useful for instance when you want
  2854. to boot over the network using BOOTP etc., where the boot
  2855. server provides just a single image file, but you want to get
  2856. for instance an OS kernel and a RAMDisk image.
  2857. "Multi-File Images" start with a list of image sizes, each
  2858. image size (in bytes) specified by an "uint32_t" in network
  2859. byte order. This list is terminated by an "(uint32_t)0".
  2860. Immediately after the terminating 0 follow the images, one by
  2861. one, all aligned on "uint32_t" boundaries (size rounded up to
  2862. a multiple of 4 bytes).
  2863. "Firmware Images" are binary images containing firmware (like
  2864. U-Boot or FPGA images) which usually will be programmed to
  2865. flash memory.
  2866. "Script files" are command sequences that will be executed by
  2867. U-Boot's command interpreter; this feature is especially
  2868. useful when you configure U-Boot to use a real shell (hush)
  2869. as command interpreter.
  2870. Standalone HOWTO:
  2871. =================
  2872. One of the features of U-Boot is that you can dynamically load and
  2873. run "standalone" applications, which can use some resources of
  2874. U-Boot like console I/O functions or interrupt services.
  2875. Two simple examples are included with the sources:
  2876. "Hello World" Demo:
  2877. -------------------
  2878. 'examples/hello_world.c' contains a small "Hello World" Demo
  2879. application; it is automatically compiled when you build U-Boot.
  2880. It's configured to run at address 0x00040004, so you can play with it
  2881. like that:
  2882. => loads
  2883. ## Ready for S-Record download ...
  2884. ~>examples/hello_world.srec
  2885. 1 2 3 4 5 6 7 8 9 10 11 ...
  2886. [file transfer complete]
  2887. [connected]
  2888. ## Start Addr = 0x00040004
  2889. => go 40004 Hello World! This is a test.
  2890. ## Starting application at 0x00040004 ...
  2891. Hello World
  2892. argc = 7
  2893. argv[0] = "40004"
  2894. argv[1] = "Hello"
  2895. argv[2] = "World!"
  2896. argv[3] = "This"
  2897. argv[4] = "is"
  2898. argv[5] = "a"
  2899. argv[6] = "test."
  2900. argv[7] = "<NULL>"
  2901. Hit any key to exit ...
  2902. ## Application terminated, rc = 0x0
  2903. Another example, which demonstrates how to register a CPM interrupt
  2904. handler with the U-Boot code, can be found in 'examples/timer.c'.
  2905. Here, a CPM timer is set up to generate an interrupt every second.
  2906. The interrupt service routine is trivial, just printing a '.'
  2907. character, but this is just a demo program. The application can be
  2908. controlled by the following keys:
  2909. ? - print current values og the CPM Timer registers
  2910. b - enable interrupts and start timer
  2911. e - stop timer and disable interrupts
  2912. q - quit application
  2913. => loads
  2914. ## Ready for S-Record download ...
  2915. ~>examples/timer.srec
  2916. 1 2 3 4 5 6 7 8 9 10 11 ...
  2917. [file transfer complete]
  2918. [connected]
  2919. ## Start Addr = 0x00040004
  2920. => go 40004
  2921. ## Starting application at 0x00040004 ...
  2922. TIMERS=0xfff00980
  2923. Using timer 1
  2924. tgcr @ 0xfff00980, tmr @ 0xfff00990, trr @ 0xfff00994, tcr @ 0xfff00998, tcn @ 0xfff0099c, ter @ 0xfff009b0
  2925. Hit 'b':
  2926. [q, b, e, ?] Set interval 1000000 us
  2927. Enabling timer
  2928. Hit '?':
  2929. [q, b, e, ?] ........
  2930. tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0xef6, ter=0x0
  2931. Hit '?':
  2932. [q, b, e, ?] .
  2933. tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x2ad4, ter=0x0
  2934. Hit '?':
  2935. [q, b, e, ?] .
  2936. tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x1efc, ter=0x0
  2937. Hit '?':
  2938. [q, b, e, ?] .
  2939. tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x169d, ter=0x0
  2940. Hit 'e':
  2941. [q, b, e, ?] ...Stopping timer
  2942. Hit 'q':
  2943. [q, b, e, ?] ## Application terminated, rc = 0x0
  2944. Minicom warning:
  2945. ================
  2946. Over time, many people have reported problems when trying to use the
  2947. "minicom" terminal emulation program for serial download. I (wd)
  2948. consider minicom to be broken, and recommend not to use it. Under
  2949. Unix, I recommend to use C-Kermit for general purpose use (and
  2950. especially for kermit binary protocol download ("loadb" command), and
  2951. use "cu" for S-Record download ("loads" command).
  2952. Nevertheless, if you absolutely want to use it try adding this
  2953. configuration to your "File transfer protocols" section:
  2954. Name Program Name U/D FullScr IO-Red. Multi
  2955. X kermit /usr/bin/kermit -i -l %l -s Y U Y N N
  2956. Y kermit /usr/bin/kermit -i -l %l -r N D Y N N
  2957. NetBSD Notes:
  2958. =============
  2959. Starting at version 0.9.2, U-Boot supports NetBSD both as host
  2960. (build U-Boot) and target system (boots NetBSD/mpc8xx).
  2961. Building requires a cross environment; it is known to work on
  2962. NetBSD/i386 with the cross-powerpc-netbsd-1.3 package (you will also
  2963. need gmake since the Makefiles are not compatible with BSD make).
  2964. Note that the cross-powerpc package does not install include files;
  2965. attempting to build U-Boot will fail because <machine/ansi.h> is
  2966. missing. This file has to be installed and patched manually:
  2967. # cd /usr/pkg/cross/powerpc-netbsd/include
  2968. # mkdir powerpc
  2969. # ln -s powerpc machine
  2970. # cp /usr/src/sys/arch/powerpc/include/ansi.h powerpc/ansi.h
  2971. # ${EDIT} powerpc/ansi.h ## must remove __va_list, _BSD_VA_LIST
  2972. Native builds *don't* work due to incompatibilities between native
  2973. and U-Boot include files.
  2974. Booting assumes that (the first part of) the image booted is a
  2975. stage-2 loader which in turn loads and then invokes the kernel
  2976. proper. Loader sources will eventually appear in the NetBSD source
  2977. tree (probably in sys/arc/mpc8xx/stand/u-boot_stage2/); in the
  2978. meantime, see ftp://ftp.denx.de/pub/u-boot/ppcboot_stage2.tar.gz
  2979. Implementation Internals:
  2980. =========================
  2981. The following is not intended to be a complete description of every
  2982. implementation detail. However, it should help to understand the
  2983. inner workings of U-Boot and make it easier to port it to custom
  2984. hardware.
  2985. Initial Stack, Global Data:
  2986. ---------------------------
  2987. The implementation of U-Boot is complicated by the fact that U-Boot
  2988. starts running out of ROM (flash memory), usually without access to
  2989. system RAM (because the memory controller is not initialized yet).
  2990. This means that we don't have writable Data or BSS segments, and BSS
  2991. is not initialized as zero. To be able to get a C environment working
  2992. at all, we have to allocate at least a minimal stack. Implementation
  2993. options for this are defined and restricted by the CPU used: Some CPU
  2994. models provide on-chip memory (like the IMMR area on MPC8xx and
  2995. MPC826x processors), on others (parts of) the data cache can be
  2996. locked as (mis-) used as memory, etc.
  2997. Chris Hallinan posted a good summary of these issues to the
  2998. U-Boot mailing list:
  2999. Subject: RE: [U-Boot-Users] RE: More On Memory Bank x (nothingness)?
  3000. From: "Chris Hallinan" <clh@net1plus.com>
  3001. Date: Mon, 10 Feb 2003 16:43:46 -0500 (22:43 MET)
  3002. ...
  3003. Correct me if I'm wrong, folks, but the way I understand it
  3004. is this: Using DCACHE as initial RAM for Stack, etc, does not
  3005. require any physical RAM backing up the cache. The cleverness
  3006. is that the cache is being used as a temporary supply of
  3007. necessary storage before the SDRAM controller is setup. It's
  3008. beyond the scope of this list to explain the details, but you
  3009. can see how this works by studying the cache architecture and
  3010. operation in the architecture and processor-specific manuals.
  3011. OCM is On Chip Memory, which I believe the 405GP has 4K. It
  3012. is another option for the system designer to use as an
  3013. initial stack/RAM area prior to SDRAM being available. Either
  3014. option should work for you. Using CS 4 should be fine if your
  3015. board designers haven't used it for something that would
  3016. cause you grief during the initial boot! It is frequently not
  3017. used.
  3018. CONFIG_SYS_INIT_RAM_ADDR should be somewhere that won't interfere
  3019. with your processor/board/system design. The default value
  3020. you will find in any recent u-boot distribution in
  3021. walnut.h should work for you. I'd set it to a value larger
  3022. than your SDRAM module. If you have a 64MB SDRAM module, set
  3023. it above 400_0000. Just make sure your board has no resources
  3024. that are supposed to respond to that address! That code in
  3025. start.S has been around a while and should work as is when
  3026. you get the config right.
  3027. -Chris Hallinan
  3028. DS4.COM, Inc.
  3029. It is essential to remember this, since it has some impact on the C
  3030. code for the initialization procedures:
  3031. * Initialized global data (data segment) is read-only. Do not attempt
  3032. to write it.
  3033. * Do not use any uninitialized global data (or implicitely initialized
  3034. as zero data - BSS segment) at all - this is undefined, initiali-
  3035. zation is performed later (when relocating to RAM).
  3036. * Stack space is very limited. Avoid big data buffers or things like
  3037. that.
  3038. Having only the stack as writable memory limits means we cannot use
  3039. normal global data to share information beween the code. But it
  3040. turned out that the implementation of U-Boot can be greatly
  3041. simplified by making a global data structure (gd_t) available to all
  3042. functions. We could pass a pointer to this data as argument to _all_
  3043. functions, but this would bloat the code. Instead we use a feature of
  3044. the GCC compiler (Global Register Variables) to share the data: we
  3045. place a pointer (gd) to the global data into a register which we
  3046. reserve for this purpose.
  3047. When choosing a register for such a purpose we are restricted by the
  3048. relevant (E)ABI specifications for the current architecture, and by
  3049. GCC's implementation.
  3050. For PowerPC, the following registers have specific use:
  3051. R1: stack pointer
  3052. R2: reserved for system use
  3053. R3-R4: parameter passing and return values
  3054. R5-R10: parameter passing
  3055. R13: small data area pointer
  3056. R30: GOT pointer
  3057. R31: frame pointer
  3058. (U-Boot also uses R12 as internal GOT pointer. r12
  3059. is a volatile register so r12 needs to be reset when
  3060. going back and forth between asm and C)
  3061. ==> U-Boot will use R2 to hold a pointer to the global data
  3062. Note: on PPC, we could use a static initializer (since the
  3063. address of the global data structure is known at compile time),
  3064. but it turned out that reserving a register results in somewhat
  3065. smaller code - although the code savings are not that big (on
  3066. average for all boards 752 bytes for the whole U-Boot image,
  3067. 624 text + 127 data).
  3068. On Blackfin, the normal C ABI (except for P3) is followed as documented here:
  3069. http://docs.blackfin.uclinux.org/doku.php?id=application_binary_interface
  3070. ==> U-Boot will use P3 to hold a pointer to the global data
  3071. On ARM, the following registers are used:
  3072. R0: function argument word/integer result
  3073. R1-R3: function argument word
  3074. R9: GOT pointer
  3075. R10: stack limit (used only if stack checking if enabled)
  3076. R11: argument (frame) pointer
  3077. R12: temporary workspace
  3078. R13: stack pointer
  3079. R14: link register
  3080. R15: program counter
  3081. ==> U-Boot will use R8 to hold a pointer to the global data
  3082. NOTE: DECLARE_GLOBAL_DATA_PTR must be used with file-global scope,
  3083. or current versions of GCC may "optimize" the code too much.
  3084. Memory Management:
  3085. ------------------
  3086. U-Boot runs in system state and uses physical addresses, i.e. the
  3087. MMU is not used either for address mapping nor for memory protection.
  3088. The available memory is mapped to fixed addresses using the memory
  3089. controller. In this process, a contiguous block is formed for each
  3090. memory type (Flash, SDRAM, SRAM), even when it consists of several
  3091. physical memory banks.
  3092. U-Boot is installed in the first 128 kB of the first Flash bank (on
  3093. TQM8xxL modules this is the range 0x40000000 ... 0x4001FFFF). After
  3094. booting and sizing and initializing DRAM, the code relocates itself
  3095. to the upper end of DRAM. Immediately below the U-Boot code some
  3096. memory is reserved for use by malloc() [see CONFIG_SYS_MALLOC_LEN
  3097. configuration setting]. Below that, a structure with global Board
  3098. Info data is placed, followed by the stack (growing downward).
  3099. Additionally, some exception handler code is copied to the low 8 kB
  3100. of DRAM (0x00000000 ... 0x00001FFF).
  3101. So a typical memory configuration with 16 MB of DRAM could look like
  3102. this:
  3103. 0x0000 0000 Exception Vector code
  3104. :
  3105. 0x0000 1FFF
  3106. 0x0000 2000 Free for Application Use
  3107. :
  3108. :
  3109. :
  3110. :
  3111. 0x00FB FF20 Monitor Stack (Growing downward)
  3112. 0x00FB FFAC Board Info Data and permanent copy of global data
  3113. 0x00FC 0000 Malloc Arena
  3114. :
  3115. 0x00FD FFFF
  3116. 0x00FE 0000 RAM Copy of Monitor Code
  3117. ... eventually: LCD or video framebuffer
  3118. ... eventually: pRAM (Protected RAM - unchanged by reset)
  3119. 0x00FF FFFF [End of RAM]
  3120. System Initialization:
  3121. ----------------------
  3122. In the reset configuration, U-Boot starts at the reset entry point
  3123. (on most PowerPC systems at address 0x00000100). Because of the reset
  3124. configuration for CS0# this is a mirror of the onboard Flash memory.
  3125. To be able to re-map memory U-Boot then jumps to its link address.
  3126. To be able to implement the initialization code in C, a (small!)
  3127. initial stack is set up in the internal Dual Ported RAM (in case CPUs
  3128. which provide such a feature like MPC8xx or MPC8260), or in a locked
  3129. part of the data cache. After that, U-Boot initializes the CPU core,
  3130. the caches and the SIU.
  3131. Next, all (potentially) available memory banks are mapped using a
  3132. preliminary mapping. For example, we put them on 512 MB boundaries
  3133. (multiples of 0x20000000: SDRAM on 0x00000000 and 0x20000000, Flash
  3134. on 0x40000000 and 0x60000000, SRAM on 0x80000000). Then UPM A is
  3135. programmed for SDRAM access. Using the temporary configuration, a
  3136. simple memory test is run that determines the size of the SDRAM
  3137. banks.
  3138. When there is more than one SDRAM bank, and the banks are of
  3139. different size, the largest is mapped first. For equal size, the first
  3140. bank (CS2#) is mapped first. The first mapping is always for address
  3141. 0x00000000, with any additional banks following immediately to create
  3142. contiguous memory starting from 0.
  3143. Then, the monitor installs itself at the upper end of the SDRAM area
  3144. and allocates memory for use by malloc() and for the global Board
  3145. Info data; also, the exception vector code is copied to the low RAM
  3146. pages, and the final stack is set up.
  3147. Only after this relocation will you have a "normal" C environment;
  3148. until that you are restricted in several ways, mostly because you are
  3149. running from ROM, and because the code will have to be relocated to a
  3150. new address in RAM.
  3151. U-Boot Porting Guide:
  3152. ----------------------
  3153. [Based on messages by Jerry Van Baren in the U-Boot-Users mailing
  3154. list, October 2002]
  3155. int main(int argc, char *argv[])
  3156. {
  3157. sighandler_t no_more_time;
  3158. signal(SIGALRM, no_more_time);
  3159. alarm(PROJECT_DEADLINE - toSec (3 * WEEK));
  3160. if (available_money > available_manpower) {
  3161. Pay consultant to port U-Boot;
  3162. return 0;
  3163. }
  3164. Download latest U-Boot source;
  3165. Subscribe to u-boot mailing list;
  3166. if (clueless)
  3167. email("Hi, I am new to U-Boot, how do I get started?");
  3168. while (learning) {
  3169. Read the README file in the top level directory;
  3170. Read http://www.denx.de/twiki/bin/view/DULG/Manual;
  3171. Read applicable doc/*.README;
  3172. Read the source, Luke;
  3173. /* find . -name "*.[chS]" | xargs grep -i <keyword> */
  3174. }
  3175. if (available_money > toLocalCurrency ($2500))
  3176. Buy a BDI3000;
  3177. else
  3178. Add a lot of aggravation and time;
  3179. if (a similar board exists) { /* hopefully... */
  3180. cp -a board/<similar> board/<myboard>
  3181. cp include/configs/<similar>.h include/configs/<myboard>.h
  3182. } else {
  3183. Create your own board support subdirectory;
  3184. Create your own board include/configs/<myboard>.h file;
  3185. }
  3186. Edit new board/<myboard> files
  3187. Edit new include/configs/<myboard>.h
  3188. while (!accepted) {
  3189. while (!running) {
  3190. do {
  3191. Add / modify source code;
  3192. } until (compiles);
  3193. Debug;
  3194. if (clueless)
  3195. email("Hi, I am having problems...");
  3196. }
  3197. Send patch file to the U-Boot email list;
  3198. if (reasonable critiques)
  3199. Incorporate improvements from email list code review;
  3200. else
  3201. Defend code as written;
  3202. }
  3203. return 0;
  3204. }
  3205. void no_more_time (int sig)
  3206. {
  3207. hire_a_guru();
  3208. }
  3209. Coding Standards:
  3210. -----------------
  3211. All contributions to U-Boot should conform to the Linux kernel
  3212. coding style; see the file "Documentation/CodingStyle" and the script
  3213. "scripts/Lindent" in your Linux kernel source directory. In sources
  3214. originating from U-Boot a style corresponding to "Lindent -pcs" (adding
  3215. spaces before parameters to function calls) is actually used.
  3216. Source files originating from a different project (for example the
  3217. MTD subsystem) are generally exempt from these guidelines and are not
  3218. reformated to ease subsequent migration to newer versions of those
  3219. sources.
  3220. Please note that U-Boot is implemented in C (and to some small parts in
  3221. Assembler); no C++ is used, so please do not use C++ style comments (//)
  3222. in your code.
  3223. Please also stick to the following formatting rules:
  3224. - remove any trailing white space
  3225. - use TAB characters for indentation, not spaces
  3226. - make sure NOT to use DOS '\r\n' line feeds
  3227. - do not add more than 2 empty lines to source files
  3228. - do not add trailing empty lines to source files
  3229. Submissions which do not conform to the standards may be returned
  3230. with a request to reformat the changes.
  3231. Submitting Patches:
  3232. -------------------
  3233. Since the number of patches for U-Boot is growing, we need to
  3234. establish some rules. Submissions which do not conform to these rules
  3235. may be rejected, even when they contain important and valuable stuff.
  3236. Please see http://www.denx.de/wiki/U-Boot/Patches for details.
  3237. Patches shall be sent to the u-boot mailing list <u-boot@lists.denx.de>;
  3238. see http://lists.denx.de/mailman/listinfo/u-boot
  3239. When you send a patch, please include the following information with
  3240. it:
  3241. * For bug fixes: a description of the bug and how your patch fixes
  3242. this bug. Please try to include a way of demonstrating that the
  3243. patch actually fixes something.
  3244. * For new features: a description of the feature and your
  3245. implementation.
  3246. * A CHANGELOG entry as plaintext (separate from the patch)
  3247. * For major contributions, your entry to the CREDITS file
  3248. * When you add support for a new board, don't forget to add this
  3249. board to the MAKEALL script, too.
  3250. * If your patch adds new configuration options, don't forget to
  3251. document these in the README file.
  3252. * The patch itself. If you are using git (which is *strongly*
  3253. recommended) you can easily generate the patch using the
  3254. "git-format-patch". If you then use "git-send-email" to send it to
  3255. the U-Boot mailing list, you will avoid most of the common problems
  3256. with some other mail clients.
  3257. If you cannot use git, use "diff -purN OLD NEW". If your version of
  3258. diff does not support these options, then get the latest version of
  3259. GNU diff.
  3260. The current directory when running this command shall be the parent
  3261. directory of the U-Boot source tree (i. e. please make sure that
  3262. your patch includes sufficient directory information for the
  3263. affected files).
  3264. We prefer patches as plain text. MIME attachments are discouraged,
  3265. and compressed attachments must not be used.
  3266. * If one logical set of modifications affects or creates several
  3267. files, all these changes shall be submitted in a SINGLE patch file.
  3268. * Changesets that contain different, unrelated modifications shall be
  3269. submitted as SEPARATE patches, one patch per changeset.
  3270. Notes:
  3271. * Before sending the patch, run the MAKEALL script on your patched
  3272. source tree and make sure that no errors or warnings are reported
  3273. for any of the boards.
  3274. * Keep your modifications to the necessary minimum: A patch
  3275. containing several unrelated changes or arbitrary reformats will be
  3276. returned with a request to re-formatting / split it.
  3277. * If you modify existing code, make sure that your new code does not
  3278. add to the memory footprint of the code ;-) Small is beautiful!
  3279. When adding new features, these should compile conditionally only
  3280. (using #ifdef), and the resulting code with the new feature
  3281. disabled must not need more memory than the old code without your
  3282. modification.
  3283. * Remember that there is a size limit of 100 kB per message on the
  3284. u-boot mailing list. Bigger patches will be moderated. If they are
  3285. reasonable and not too big, they will be acknowledged. But patches
  3286. bigger than the size limit should be avoided.