README 146 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. /nios2 Files generic to Altera NIOS2 architecture
  146. /cpu CPU specific files
  147. /lib Architecture specific library files
  148. /powerpc Files generic to PowerPC architecture
  149. /cpu CPU specific files
  150. /74xx_7xx Files specific to Freescale MPC74xx and 7xx CPUs
  151. /mpc5xx Files specific to Freescale MPC5xx CPUs
  152. /mpc5xxx Files specific to Freescale MPC5xxx CPUs
  153. /mpc8xx Files specific to Freescale MPC8xx CPUs
  154. /mpc8220 Files specific to Freescale MPC8220 CPUs
  155. /mpc824x Files specific to Freescale MPC824x CPUs
  156. /mpc8260 Files specific to Freescale MPC8260 CPUs
  157. /mpc85xx Files specific to Freescale MPC85xx CPUs
  158. /ppc4xx Files specific to AMCC PowerPC 4xx CPUs
  159. /lib Architecture specific library files
  160. /sh Files generic to SH architecture
  161. /cpu CPU specific files
  162. /sh2 Files specific to sh2 CPUs
  163. /sh3 Files specific to sh3 CPUs
  164. /sh4 Files specific to sh4 CPUs
  165. /lib Architecture specific library files
  166. /sparc Files generic to SPARC architecture
  167. /cpu CPU specific files
  168. /leon2 Files specific to Gaisler LEON2 SPARC CPU
  169. /leon3 Files specific to Gaisler LEON3 SPARC CPU
  170. /lib Architecture specific library files
  171. /api Machine/arch independent API for external apps
  172. /board Board dependent files
  173. /common Misc architecture independent functions
  174. /disk Code for disk drive partition handling
  175. /doc Documentation (don't expect too much)
  176. /drivers Commonly used device drivers
  177. /examples Example code for standalone applications, etc.
  178. /fs Filesystem code (cramfs, ext2, jffs2, etc.)
  179. /include Header Files
  180. /lib Files generic to all architectures
  181. /libfdt Library files to support flattened device trees
  182. /lzma Library files to support LZMA decompression
  183. /lzo Library files to support LZO decompression
  184. /net Networking code
  185. /post Power On Self Test
  186. /rtc Real Time Clock drivers
  187. /tools Tools to build S-Record or U-Boot images, etc.
  188. Software Configuration:
  189. =======================
  190. Configuration is usually done using C preprocessor defines; the
  191. rationale behind that is to avoid dead code whenever possible.
  192. There are two classes of configuration variables:
  193. * Configuration _OPTIONS_:
  194. These are selectable by the user and have names beginning with
  195. "CONFIG_".
  196. * Configuration _SETTINGS_:
  197. These depend on the hardware etc. and should not be meddled with if
  198. you don't know what you're doing; they have names beginning with
  199. "CONFIG_SYS_".
  200. Later we will add a configuration tool - probably similar to or even
  201. identical to what's used for the Linux kernel. Right now, we have to
  202. do the configuration by hand, which means creating some symbolic
  203. links and editing some configuration files. We use the TQM8xxL boards
  204. as an example here.
  205. Selection of Processor Architecture and Board Type:
  206. ---------------------------------------------------
  207. For all supported boards there are ready-to-use default
  208. configurations available; just type "make <board_name>_config".
  209. Example: For a TQM823L module type:
  210. cd u-boot
  211. make TQM823L_config
  212. For the Cogent platform, you need to specify the CPU type as well;
  213. e.g. "make cogent_mpc8xx_config". And also configure the cogent
  214. directory according to the instructions in cogent/README.
  215. Configuration Options:
  216. ----------------------
  217. Configuration depends on the combination of board and CPU type; all
  218. such information is kept in a configuration file
  219. "include/configs/<board_name>.h".
  220. Example: For a TQM823L module, all configuration settings are in
  221. "include/configs/TQM823L.h".
  222. Many of the options are named exactly as the corresponding Linux
  223. kernel configuration options. The intention is to make it easier to
  224. build a config tool - later.
  225. The following options need to be configured:
  226. - CPU Type: Define exactly one, e.g. CONFIG_MPC85XX.
  227. - Board Type: Define exactly one, e.g. CONFIG_MPC8540ADS.
  228. - CPU Daughterboard Type: (if CONFIG_ATSTK1000 is defined)
  229. Define exactly one, e.g. CONFIG_ATSTK1002
  230. - CPU Module Type: (if CONFIG_COGENT is defined)
  231. Define exactly one of
  232. CONFIG_CMA286_60_OLD
  233. --- FIXME --- not tested yet:
  234. CONFIG_CMA286_60, CONFIG_CMA286_21, CONFIG_CMA286_60P,
  235. CONFIG_CMA287_23, CONFIG_CMA287_50
  236. - Motherboard Type: (if CONFIG_COGENT is defined)
  237. Define exactly one of
  238. CONFIG_CMA101, CONFIG_CMA102
  239. - Motherboard I/O Modules: (if CONFIG_COGENT is defined)
  240. Define one or more of
  241. CONFIG_CMA302
  242. - Motherboard Options: (if CONFIG_CMA101 or CONFIG_CMA102 are defined)
  243. Define one or more of
  244. CONFIG_LCD_HEARTBEAT - update a character position on
  245. the LCD display every second with
  246. a "rotator" |\-/|\-/
  247. - Board flavour: (if CONFIG_MPC8260ADS is defined)
  248. CONFIG_ADSTYPE
  249. Possible values are:
  250. CONFIG_SYS_8260ADS - original MPC8260ADS
  251. CONFIG_SYS_8266ADS - MPC8266ADS
  252. CONFIG_SYS_PQ2FADS - PQ2FADS-ZU or PQ2FADS-VR
  253. CONFIG_SYS_8272ADS - MPC8272ADS
  254. - MPC824X Family Member (if CONFIG_MPC824X is defined)
  255. Define exactly one of
  256. CONFIG_MPC8240, CONFIG_MPC8245
  257. - 8xx CPU Options: (if using an MPC8xx CPU)
  258. CONFIG_8xx_GCLK_FREQ - deprecated: CPU clock if
  259. get_gclk_freq() cannot work
  260. e.g. if there is no 32KHz
  261. reference PIT/RTC clock
  262. CONFIG_8xx_OSCLK - PLL input clock (either EXTCLK
  263. or XTAL/EXTAL)
  264. - 859/866/885 CPU options: (if using a MPC859 or MPC866 or MPC885 CPU):
  265. CONFIG_SYS_8xx_CPUCLK_MIN
  266. CONFIG_SYS_8xx_CPUCLK_MAX
  267. CONFIG_8xx_CPUCLK_DEFAULT
  268. See doc/README.MPC866
  269. CONFIG_SYS_MEASURE_CPUCLK
  270. Define this to measure the actual CPU clock instead
  271. of relying on the correctness of the configured
  272. values. Mostly useful for board bringup to make sure
  273. the PLL is locked at the intended frequency. Note
  274. that this requires a (stable) reference clock (32 kHz
  275. RTC clock or CONFIG_SYS_8XX_XIN)
  276. CONFIG_SYS_DELAYED_ICACHE
  277. Define this option if you want to enable the
  278. ICache only when Code runs from RAM.
  279. - Intel Monahans options:
  280. CONFIG_SYS_MONAHANS_RUN_MODE_OSC_RATIO
  281. Defines the Monahans run mode to oscillator
  282. ratio. Valid values are 8, 16, 24, 31. The core
  283. frequency is this value multiplied by 13 MHz.
  284. CONFIG_SYS_MONAHANS_TURBO_RUN_MODE_RATIO
  285. Defines the Monahans turbo mode to oscillator
  286. ratio. Valid values are 1 (default if undefined) and
  287. 2. The core frequency as calculated above is multiplied
  288. by this value.
  289. - Linux Kernel Interface:
  290. CONFIG_CLOCKS_IN_MHZ
  291. U-Boot stores all clock information in Hz
  292. internally. For binary compatibility with older Linux
  293. kernels (which expect the clocks passed in the
  294. bd_info data to be in MHz) the environment variable
  295. "clocks_in_mhz" can be defined so that U-Boot
  296. converts clock data to MHZ before passing it to the
  297. Linux kernel.
  298. When CONFIG_CLOCKS_IN_MHZ is defined, a definition of
  299. "clocks_in_mhz=1" is automatically included in the
  300. default environment.
  301. CONFIG_MEMSIZE_IN_BYTES [relevant for MIPS only]
  302. When transferring memsize parameter to linux, some versions
  303. expect it to be in bytes, others in MB.
  304. Define CONFIG_MEMSIZE_IN_BYTES to make it in bytes.
  305. CONFIG_OF_LIBFDT
  306. New kernel versions are expecting firmware settings to be
  307. passed using flattened device trees (based on open firmware
  308. concepts).
  309. CONFIG_OF_LIBFDT
  310. * New libfdt-based support
  311. * Adds the "fdt" command
  312. * The bootm command automatically updates the fdt
  313. OF_CPU - The proper name of the cpus node (only required for
  314. MPC512X and MPC5xxx based boards).
  315. OF_SOC - The proper name of the soc node (only required for
  316. MPC512X and MPC5xxx based boards).
  317. OF_TBCLK - The timebase frequency.
  318. OF_STDOUT_PATH - The path to the console device
  319. boards with QUICC Engines require OF_QE to set UCC MAC
  320. addresses
  321. CONFIG_OF_BOARD_SETUP
  322. Board code has addition modification that it wants to make
  323. to the flat device tree before handing it off to the kernel
  324. CONFIG_OF_BOOT_CPU
  325. This define fills in the correct boot CPU in the boot
  326. param header, the default value is zero if undefined.
  327. CONFIG_OF_IDE_FIXUP
  328. U-Boot can detect if an IDE device is present or not.
  329. If not, and this new config option is activated, U-Boot
  330. removes the ATA node from the DTS before booting Linux,
  331. so the Linux IDE driver does not probe the device and
  332. crash. This is needed for buggy hardware (uc101) where
  333. no pull down resistor is connected to the signal IDE5V_DD7.
  334. - vxWorks boot parameters:
  335. bootvx constructs a valid bootline using the following
  336. environments variables: bootfile, ipaddr, serverip, hostname.
  337. It loads the vxWorks image pointed bootfile.
  338. CONFIG_SYS_VXWORKS_BOOT_DEVICE - The vxworks device name
  339. CONFIG_SYS_VXWORKS_MAC_PTR - Ethernet 6 byte MA -address
  340. CONFIG_SYS_VXWORKS_SERVERNAME - Name of the server
  341. CONFIG_SYS_VXWORKS_BOOT_ADDR - Address of boot parameters
  342. CONFIG_SYS_VXWORKS_ADD_PARAMS
  343. Add it at the end of the bootline. E.g "u=username pw=secret"
  344. Note: If a "bootargs" environment is defined, it will overwride
  345. the defaults discussed just above.
  346. - Serial Ports:
  347. CONFIG_PL010_SERIAL
  348. Define this if you want support for Amba PrimeCell PL010 UARTs.
  349. CONFIG_PL011_SERIAL
  350. Define this if you want support for Amba PrimeCell PL011 UARTs.
  351. CONFIG_PL011_CLOCK
  352. If you have Amba PrimeCell PL011 UARTs, set this variable to
  353. the clock speed of the UARTs.
  354. CONFIG_PL01x_PORTS
  355. If you have Amba PrimeCell PL010 or PL011 UARTs on your board,
  356. define this to a list of base addresses for each (supported)
  357. port. See e.g. include/configs/versatile.h
  358. - Console Interface:
  359. Depending on board, define exactly one serial port
  360. (like CONFIG_8xx_CONS_SMC1, CONFIG_8xx_CONS_SMC2,
  361. CONFIG_8xx_CONS_SCC1, ...), or switch off the serial
  362. console by defining CONFIG_8xx_CONS_NONE
  363. Note: if CONFIG_8xx_CONS_NONE is defined, the serial
  364. port routines must be defined elsewhere
  365. (i.e. serial_init(), serial_getc(), ...)
  366. CONFIG_CFB_CONSOLE
  367. Enables console device for a color framebuffer. Needs following
  368. defines (cf. smiLynxEM, i8042, board/eltec/bab7xx)
  369. VIDEO_FB_LITTLE_ENDIAN graphic memory organisation
  370. (default big endian)
  371. VIDEO_HW_RECTFILL graphic chip supports
  372. rectangle fill
  373. (cf. smiLynxEM)
  374. VIDEO_HW_BITBLT graphic chip supports
  375. bit-blit (cf. smiLynxEM)
  376. VIDEO_VISIBLE_COLS visible pixel columns
  377. (cols=pitch)
  378. VIDEO_VISIBLE_ROWS visible pixel rows
  379. VIDEO_PIXEL_SIZE bytes per pixel
  380. VIDEO_DATA_FORMAT graphic data format
  381. (0-5, cf. cfb_console.c)
  382. VIDEO_FB_ADRS framebuffer address
  383. VIDEO_KBD_INIT_FCT keyboard int fct
  384. (i.e. i8042_kbd_init())
  385. VIDEO_TSTC_FCT test char fct
  386. (i.e. i8042_tstc)
  387. VIDEO_GETC_FCT get char fct
  388. (i.e. i8042_getc)
  389. CONFIG_CONSOLE_CURSOR cursor drawing on/off
  390. (requires blink timer
  391. cf. i8042.c)
  392. CONFIG_SYS_CONSOLE_BLINK_COUNT blink interval (cf. i8042.c)
  393. CONFIG_CONSOLE_TIME display time/date info in
  394. upper right corner
  395. (requires CONFIG_CMD_DATE)
  396. CONFIG_VIDEO_LOGO display Linux logo in
  397. upper left corner
  398. CONFIG_VIDEO_BMP_LOGO use bmp_logo.h instead of
  399. linux_logo.h for logo.
  400. Requires CONFIG_VIDEO_LOGO
  401. CONFIG_CONSOLE_EXTRA_INFO
  402. additional board info beside
  403. the logo
  404. When CONFIG_CFB_CONSOLE is defined, video console is
  405. default i/o. Serial console can be forced with
  406. environment 'console=serial'.
  407. When CONFIG_SILENT_CONSOLE is defined, all console
  408. messages (by U-Boot and Linux!) can be silenced with
  409. the "silent" environment variable. See
  410. doc/README.silent for more information.
  411. - Console Baudrate:
  412. CONFIG_BAUDRATE - in bps
  413. Select one of the baudrates listed in
  414. CONFIG_SYS_BAUDRATE_TABLE, see below.
  415. CONFIG_SYS_BRGCLK_PRESCALE, baudrate prescale
  416. - Console Rx buffer length
  417. With CONFIG_SYS_SMC_RXBUFLEN it is possible to define
  418. the maximum receive buffer length for the SMC.
  419. This option is actual only for 82xx and 8xx possible.
  420. If using CONFIG_SYS_SMC_RXBUFLEN also CONFIG_SYS_MAXIDLE
  421. must be defined, to setup the maximum idle timeout for
  422. the SMC.
  423. - Interrupt driven serial port input:
  424. CONFIG_SERIAL_SOFTWARE_FIFO
  425. PPC405GP only.
  426. Use an interrupt handler for receiving data on the
  427. serial port. It also enables using hardware handshake
  428. (RTS/CTS) and UART's built-in FIFO. Set the number of
  429. bytes the interrupt driven input buffer should have.
  430. Leave undefined to disable this feature, including
  431. disable the buffer and hardware handshake.
  432. - Console UART Number:
  433. CONFIG_UART1_CONSOLE
  434. AMCC PPC4xx only.
  435. If defined internal UART1 (and not UART0) is used
  436. as default U-Boot console.
  437. - Boot Delay: CONFIG_BOOTDELAY - in seconds
  438. Delay before automatically booting the default image;
  439. set to -1 to disable autoboot.
  440. See doc/README.autoboot for these options that
  441. work with CONFIG_BOOTDELAY. None are required.
  442. CONFIG_BOOT_RETRY_TIME
  443. CONFIG_BOOT_RETRY_MIN
  444. CONFIG_AUTOBOOT_KEYED
  445. CONFIG_AUTOBOOT_PROMPT
  446. CONFIG_AUTOBOOT_DELAY_STR
  447. CONFIG_AUTOBOOT_STOP_STR
  448. CONFIG_AUTOBOOT_DELAY_STR2
  449. CONFIG_AUTOBOOT_STOP_STR2
  450. CONFIG_ZERO_BOOTDELAY_CHECK
  451. CONFIG_RESET_TO_RETRY
  452. - Autoboot Command:
  453. CONFIG_BOOTCOMMAND
  454. Only needed when CONFIG_BOOTDELAY is enabled;
  455. define a command string that is automatically executed
  456. when no character is read on the console interface
  457. within "Boot Delay" after reset.
  458. CONFIG_BOOTARGS
  459. This can be used to pass arguments to the bootm
  460. command. The value of CONFIG_BOOTARGS goes into the
  461. environment value "bootargs".
  462. CONFIG_RAMBOOT and CONFIG_NFSBOOT
  463. The value of these goes into the environment as
  464. "ramboot" and "nfsboot" respectively, and can be used
  465. as a convenience, when switching between booting from
  466. RAM and NFS.
  467. - Pre-Boot Commands:
  468. CONFIG_PREBOOT
  469. When this option is #defined, the existence of the
  470. environment variable "preboot" will be checked
  471. immediately before starting the CONFIG_BOOTDELAY
  472. countdown and/or running the auto-boot command resp.
  473. entering interactive mode.
  474. This feature is especially useful when "preboot" is
  475. automatically generated or modified. For an example
  476. see the LWMON board specific code: here "preboot" is
  477. modified when the user holds down a certain
  478. combination of keys on the (special) keyboard when
  479. booting the systems
  480. - Serial Download Echo Mode:
  481. CONFIG_LOADS_ECHO
  482. If defined to 1, all characters received during a
  483. serial download (using the "loads" command) are
  484. echoed back. This might be needed by some terminal
  485. emulations (like "cu"), but may as well just take
  486. time on others. This setting #define's the initial
  487. value of the "loads_echo" environment variable.
  488. - Kgdb Serial Baudrate: (if CONFIG_CMD_KGDB is defined)
  489. CONFIG_KGDB_BAUDRATE
  490. Select one of the baudrates listed in
  491. CONFIG_SYS_BAUDRATE_TABLE, see below.
  492. - Monitor Functions:
  493. Monitor commands can be included or excluded
  494. from the build by using the #include files
  495. "config_cmd_all.h" and #undef'ing unwanted
  496. commands, or using "config_cmd_default.h"
  497. and augmenting with additional #define's
  498. for wanted commands.
  499. The default command configuration includes all commands
  500. except those marked below with a "*".
  501. CONFIG_CMD_ASKENV * ask for env variable
  502. CONFIG_CMD_BDI bdinfo
  503. CONFIG_CMD_BEDBUG * Include BedBug Debugger
  504. CONFIG_CMD_BMP * BMP support
  505. CONFIG_CMD_BSP * Board specific commands
  506. CONFIG_CMD_BOOTD bootd
  507. CONFIG_CMD_CACHE * icache, dcache
  508. CONFIG_CMD_CONSOLE coninfo
  509. CONFIG_CMD_DATE * support for RTC, date/time...
  510. CONFIG_CMD_DHCP * DHCP support
  511. CONFIG_CMD_DIAG * Diagnostics
  512. CONFIG_CMD_DS4510 * ds4510 I2C gpio commands
  513. CONFIG_CMD_DS4510_INFO * ds4510 I2C info command
  514. CONFIG_CMD_DS4510_MEM * ds4510 I2C eeprom/sram commansd
  515. CONFIG_CMD_DS4510_RST * ds4510 I2C rst command
  516. CONFIG_CMD_DTT * Digital Therm and Thermostat
  517. CONFIG_CMD_ECHO echo arguments
  518. CONFIG_CMD_EDITENV edit env variable
  519. CONFIG_CMD_EEPROM * EEPROM read/write support
  520. CONFIG_CMD_ELF * bootelf, bootvx
  521. CONFIG_CMD_SAVEENV saveenv
  522. CONFIG_CMD_FDC * Floppy Disk Support
  523. CONFIG_CMD_FAT * FAT partition support
  524. CONFIG_CMD_FDOS * Dos diskette Support
  525. CONFIG_CMD_FLASH flinfo, erase, protect
  526. CONFIG_CMD_FPGA FPGA device initialization support
  527. CONFIG_CMD_HWFLOW * RTS/CTS hw flow control
  528. CONFIG_CMD_I2C * I2C serial bus support
  529. CONFIG_CMD_IDE * IDE harddisk support
  530. CONFIG_CMD_IMI iminfo
  531. CONFIG_CMD_IMLS List all found images
  532. CONFIG_CMD_IMMAP * IMMR dump support
  533. CONFIG_CMD_IRQ * irqinfo
  534. CONFIG_CMD_ITEST Integer/string test of 2 values
  535. CONFIG_CMD_JFFS2 * JFFS2 Support
  536. CONFIG_CMD_KGDB * kgdb
  537. CONFIG_CMD_LOADB loadb
  538. CONFIG_CMD_LOADS loads
  539. CONFIG_CMD_MD5SUM print md5 message digest
  540. (requires CONFIG_CMD_MEMORY and CONFIG_MD5)
  541. CONFIG_CMD_MEMORY md, mm, nm, mw, cp, cmp, crc, base,
  542. loop, loopw, mtest
  543. CONFIG_CMD_MISC Misc functions like sleep etc
  544. CONFIG_CMD_MMC * MMC memory mapped support
  545. CONFIG_CMD_MII * MII utility commands
  546. CONFIG_CMD_MTDPARTS * MTD partition support
  547. CONFIG_CMD_NAND * NAND support
  548. CONFIG_CMD_NET bootp, tftpboot, rarpboot
  549. CONFIG_CMD_PCA953X * PCA953x I2C gpio commands
  550. CONFIG_CMD_PCA953X_INFO * PCA953x I2C gpio info command
  551. CONFIG_CMD_PCI * pciinfo
  552. CONFIG_CMD_PCMCIA * PCMCIA support
  553. CONFIG_CMD_PING * send ICMP ECHO_REQUEST to network
  554. host
  555. CONFIG_CMD_PORTIO * Port I/O
  556. CONFIG_CMD_REGINFO * Register dump
  557. CONFIG_CMD_RUN run command in env variable
  558. CONFIG_CMD_SAVES * save S record dump
  559. CONFIG_CMD_SCSI * SCSI Support
  560. CONFIG_CMD_SDRAM * print SDRAM configuration information
  561. (requires CONFIG_CMD_I2C)
  562. CONFIG_CMD_SETGETDCR Support for DCR Register access
  563. (4xx only)
  564. CONFIG_CMD_SHA1 print sha1 memory digest
  565. (requires CONFIG_CMD_MEMORY)
  566. CONFIG_CMD_SOURCE "source" command Support
  567. CONFIG_CMD_SPI * SPI serial bus support
  568. CONFIG_CMD_USB * USB support
  569. CONFIG_CMD_VFD * VFD support (TRAB)
  570. CONFIG_CMD_CDP * Cisco Discover Protocol support
  571. CONFIG_CMD_FSL * Microblaze FSL support
  572. EXAMPLE: If you want all functions except of network
  573. support you can write:
  574. #include "config_cmd_all.h"
  575. #undef CONFIG_CMD_NET
  576. Other Commands:
  577. fdt (flattened device tree) command: CONFIG_OF_LIBFDT
  578. Note: Don't enable the "icache" and "dcache" commands
  579. (configuration option CONFIG_CMD_CACHE) unless you know
  580. what you (and your U-Boot users) are doing. Data
  581. cache cannot be enabled on systems like the 8xx or
  582. 8260 (where accesses to the IMMR region must be
  583. uncached), and it cannot be disabled on all other
  584. systems where we (mis-) use the data cache to hold an
  585. initial stack and some data.
  586. XXX - this list needs to get updated!
  587. - Watchdog:
  588. CONFIG_WATCHDOG
  589. If this variable is defined, it enables watchdog
  590. support. There must be support in the platform specific
  591. code for a watchdog. For the 8xx and 8260 CPUs, the
  592. SIU Watchdog feature is enabled in the SYPCR
  593. register.
  594. - U-Boot Version:
  595. CONFIG_VERSION_VARIABLE
  596. If this variable is defined, an environment variable
  597. named "ver" is created by U-Boot showing the U-Boot
  598. version as printed by the "version" command.
  599. This variable is readonly.
  600. - Real-Time Clock:
  601. When CONFIG_CMD_DATE is selected, the type of the RTC
  602. has to be selected, too. Define exactly one of the
  603. following options:
  604. CONFIG_RTC_MPC8xx - use internal RTC of MPC8xx
  605. CONFIG_RTC_PCF8563 - use Philips PCF8563 RTC
  606. CONFIG_RTC_MC13783 - use MC13783 RTC
  607. CONFIG_RTC_MC146818 - use MC146818 RTC
  608. CONFIG_RTC_DS1307 - use Maxim, Inc. DS1307 RTC
  609. CONFIG_RTC_DS1337 - use Maxim, Inc. DS1337 RTC
  610. CONFIG_RTC_DS1338 - use Maxim, Inc. DS1338 RTC
  611. CONFIG_RTC_DS164x - use Dallas DS164x RTC
  612. CONFIG_RTC_ISL1208 - use Intersil ISL1208 RTC
  613. CONFIG_RTC_MAX6900 - use Maxim, Inc. MAX6900 RTC
  614. CONFIG_SYS_RTC_DS1337_NOOSC - Turn off the OSC output for DS1337
  615. Note that if the RTC uses I2C, then the I2C interface
  616. must also be configured. See I2C Support, below.
  617. - GPIO Support:
  618. CONFIG_PCA953X - use NXP's PCA953X series I2C GPIO
  619. CONFIG_PCA953X_INFO - enable pca953x info command
  620. Note that if the GPIO device uses I2C, then the I2C interface
  621. must also be configured. See I2C Support, below.
  622. - Timestamp Support:
  623. When CONFIG_TIMESTAMP is selected, the timestamp
  624. (date and time) of an image is printed by image
  625. commands like bootm or iminfo. This option is
  626. automatically enabled when you select CONFIG_CMD_DATE .
  627. - Partition Support:
  628. CONFIG_MAC_PARTITION and/or CONFIG_DOS_PARTITION
  629. and/or CONFIG_ISO_PARTITION and/or CONFIG_EFI_PARTITION
  630. If IDE or SCSI support is enabled (CONFIG_CMD_IDE or
  631. CONFIG_CMD_SCSI) you must configure support for at
  632. least one partition type as well.
  633. - IDE Reset method:
  634. CONFIG_IDE_RESET_ROUTINE - this is defined in several
  635. board configurations files but used nowhere!
  636. CONFIG_IDE_RESET - is this is defined, IDE Reset will
  637. be performed by calling the function
  638. ide_set_reset(int reset)
  639. which has to be defined in a board specific file
  640. - ATAPI Support:
  641. CONFIG_ATAPI
  642. Set this to enable ATAPI support.
  643. - LBA48 Support
  644. CONFIG_LBA48
  645. Set this to enable support for disks larger than 137GB
  646. Also look at CONFIG_SYS_64BIT_LBA.
  647. Whithout these , LBA48 support uses 32bit variables and will 'only'
  648. support disks up to 2.1TB.
  649. CONFIG_SYS_64BIT_LBA:
  650. When enabled, makes the IDE subsystem use 64bit sector addresses.
  651. Default is 32bit.
  652. - SCSI Support:
  653. At the moment only there is only support for the
  654. SYM53C8XX SCSI controller; define
  655. CONFIG_SCSI_SYM53C8XX to enable it.
  656. CONFIG_SYS_SCSI_MAX_LUN [8], CONFIG_SYS_SCSI_MAX_SCSI_ID [7] and
  657. CONFIG_SYS_SCSI_MAX_DEVICE [CONFIG_SYS_SCSI_MAX_SCSI_ID *
  658. CONFIG_SYS_SCSI_MAX_LUN] can be adjusted to define the
  659. maximum numbers of LUNs, SCSI ID's and target
  660. devices.
  661. CONFIG_SYS_SCSI_SYM53C8XX_CCF to fix clock timing (80Mhz)
  662. - NETWORK Support (PCI):
  663. CONFIG_E1000
  664. Support for Intel 8254x gigabit chips.
  665. CONFIG_E1000_FALLBACK_MAC
  666. default MAC for empty EEPROM after production.
  667. CONFIG_EEPRO100
  668. Support for Intel 82557/82559/82559ER chips.
  669. Optional CONFIG_EEPRO100_SROM_WRITE enables EEPROM
  670. write routine for first time initialisation.
  671. CONFIG_TULIP
  672. Support for Digital 2114x chips.
  673. Optional CONFIG_TULIP_SELECT_MEDIA for board specific
  674. modem chip initialisation (KS8761/QS6611).
  675. CONFIG_NATSEMI
  676. Support for National dp83815 chips.
  677. CONFIG_NS8382X
  678. Support for National dp8382[01] gigabit chips.
  679. - NETWORK Support (other):
  680. CONFIG_DRIVER_AT91EMAC
  681. Support for AT91RM9200 EMAC.
  682. CONFIG_RMII
  683. Define this to use reduced MII inteface
  684. CONFIG_DRIVER_AT91EMAC_QUIET
  685. If this defined, the driver is quiet.
  686. The driver doen't show link status messages.
  687. CONFIG_DRIVER_LAN91C96
  688. Support for SMSC's LAN91C96 chips.
  689. CONFIG_LAN91C96_BASE
  690. Define this to hold the physical address
  691. of the LAN91C96's I/O space
  692. CONFIG_LAN91C96_USE_32_BIT
  693. Define this to enable 32 bit addressing
  694. CONFIG_DRIVER_SMC91111
  695. Support for SMSC's LAN91C111 chip
  696. CONFIG_SMC91111_BASE
  697. Define this to hold the physical address
  698. of the device (I/O space)
  699. CONFIG_SMC_USE_32_BIT
  700. Define this if data bus is 32 bits
  701. CONFIG_SMC_USE_IOFUNCS
  702. Define this to use i/o functions instead of macros
  703. (some hardware wont work with macros)
  704. CONFIG_SMC911X
  705. Support for SMSC's LAN911x and LAN921x chips
  706. CONFIG_SMC911X_BASE
  707. Define this to hold the physical address
  708. of the device (I/O space)
  709. CONFIG_SMC911X_32_BIT
  710. Define this if data bus is 32 bits
  711. CONFIG_SMC911X_16_BIT
  712. Define this if data bus is 16 bits. If your processor
  713. automatically converts one 32 bit word to two 16 bit
  714. words you may also try CONFIG_SMC911X_32_BIT.
  715. - USB Support:
  716. At the moment only the UHCI host controller is
  717. supported (PIP405, MIP405, MPC5200); define
  718. CONFIG_USB_UHCI to enable it.
  719. define CONFIG_USB_KEYBOARD to enable the USB Keyboard
  720. and define CONFIG_USB_STORAGE to enable the USB
  721. storage devices.
  722. Note:
  723. Supported are USB Keyboards and USB Floppy drives
  724. (TEAC FD-05PUB).
  725. MPC5200 USB requires additional defines:
  726. CONFIG_USB_CLOCK
  727. for 528 MHz Clock: 0x0001bbbb
  728. CONFIG_PSC3_USB
  729. for USB on PSC3
  730. CONFIG_USB_CONFIG
  731. for differential drivers: 0x00001000
  732. for single ended drivers: 0x00005000
  733. for differential drivers on PSC3: 0x00000100
  734. for single ended drivers on PSC3: 0x00004100
  735. CONFIG_SYS_USB_EVENT_POLL
  736. May be defined to allow interrupt polling
  737. instead of using asynchronous interrupts
  738. - USB Device:
  739. Define the below if you wish to use the USB console.
  740. Once firmware is rebuilt from a serial console issue the
  741. command "setenv stdin usbtty; setenv stdout usbtty" and
  742. attach your USB cable. The Unix command "dmesg" should print
  743. it has found a new device. The environment variable usbtty
  744. can be set to gserial or cdc_acm to enable your device to
  745. appear to a USB host as a Linux gserial device or a
  746. Common Device Class Abstract Control Model serial device.
  747. If you select usbtty = gserial you should be able to enumerate
  748. a Linux host by
  749. # modprobe usbserial vendor=0xVendorID product=0xProductID
  750. else if using cdc_acm, simply setting the environment
  751. variable usbtty to be cdc_acm should suffice. The following
  752. might be defined in YourBoardName.h
  753. CONFIG_USB_DEVICE
  754. Define this to build a UDC device
  755. CONFIG_USB_TTY
  756. Define this to have a tty type of device available to
  757. talk to the UDC device
  758. CONFIG_SYS_CONSOLE_IS_IN_ENV
  759. Define this if you want stdin, stdout &/or stderr to
  760. be set to usbtty.
  761. mpc8xx:
  762. CONFIG_SYS_USB_EXTC_CLK 0xBLAH
  763. Derive USB clock from external clock "blah"
  764. - CONFIG_SYS_USB_EXTC_CLK 0x02
  765. CONFIG_SYS_USB_BRG_CLK 0xBLAH
  766. Derive USB clock from brgclk
  767. - CONFIG_SYS_USB_BRG_CLK 0x04
  768. If you have a USB-IF assigned VendorID then you may wish to
  769. define your own vendor specific values either in BoardName.h
  770. or directly in usbd_vendor_info.h. If you don't define
  771. CONFIG_USBD_MANUFACTURER, CONFIG_USBD_PRODUCT_NAME,
  772. CONFIG_USBD_VENDORID and CONFIG_USBD_PRODUCTID, then U-Boot
  773. should pretend to be a Linux device to it's target host.
  774. CONFIG_USBD_MANUFACTURER
  775. Define this string as the name of your company for
  776. - CONFIG_USBD_MANUFACTURER "my company"
  777. CONFIG_USBD_PRODUCT_NAME
  778. Define this string as the name of your product
  779. - CONFIG_USBD_PRODUCT_NAME "acme usb device"
  780. CONFIG_USBD_VENDORID
  781. Define this as your assigned Vendor ID from the USB
  782. Implementors Forum. This *must* be a genuine Vendor ID
  783. to avoid polluting the USB namespace.
  784. - CONFIG_USBD_VENDORID 0xFFFF
  785. CONFIG_USBD_PRODUCTID
  786. Define this as the unique Product ID
  787. for your device
  788. - CONFIG_USBD_PRODUCTID 0xFFFF
  789. - MMC Support:
  790. The MMC controller on the Intel PXA is supported. To
  791. enable this define CONFIG_MMC. The MMC can be
  792. accessed from the boot prompt by mapping the device
  793. to physical memory similar to flash. Command line is
  794. enabled with CONFIG_CMD_MMC. The MMC driver also works with
  795. the FAT fs. This is enabled with CONFIG_CMD_FAT.
  796. - Journaling Flash filesystem support:
  797. CONFIG_JFFS2_NAND, CONFIG_JFFS2_NAND_OFF, CONFIG_JFFS2_NAND_SIZE,
  798. CONFIG_JFFS2_NAND_DEV
  799. Define these for a default partition on a NAND device
  800. CONFIG_SYS_JFFS2_FIRST_SECTOR,
  801. CONFIG_SYS_JFFS2_FIRST_BANK, CONFIG_SYS_JFFS2_NUM_BANKS
  802. Define these for a default partition on a NOR device
  803. CONFIG_SYS_JFFS_CUSTOM_PART
  804. Define this to create an own partition. You have to provide a
  805. function struct part_info* jffs2_part_info(int part_num)
  806. If you define only one JFFS2 partition you may also want to
  807. #define CONFIG_SYS_JFFS_SINGLE_PART 1
  808. to disable the command chpart. This is the default when you
  809. have not defined a custom partition
  810. - Keyboard Support:
  811. CONFIG_ISA_KEYBOARD
  812. Define this to enable standard (PC-Style) keyboard
  813. support
  814. CONFIG_I8042_KBD
  815. Standard PC keyboard driver with US (is default) and
  816. GERMAN key layout (switch via environment 'keymap=de') support.
  817. Export function i8042_kbd_init, i8042_tstc and i8042_getc
  818. for cfb_console. Supports cursor blinking.
  819. - Video support:
  820. CONFIG_VIDEO
  821. Define this to enable video support (for output to
  822. video).
  823. CONFIG_VIDEO_CT69000
  824. Enable Chips & Technologies 69000 Video chip
  825. CONFIG_VIDEO_SMI_LYNXEM
  826. Enable Silicon Motion SMI 712/710/810 Video chip. The
  827. video output is selected via environment 'videoout'
  828. (1 = LCD and 2 = CRT). If videoout is undefined, CRT is
  829. assumed.
  830. For the CT69000 and SMI_LYNXEM drivers, videomode is
  831. selected via environment 'videomode'. Two different ways
  832. are possible:
  833. - "videomode=num" 'num' is a standard LiLo mode numbers.
  834. Following standard modes are supported (* is default):
  835. Colors 640x480 800x600 1024x768 1152x864 1280x1024
  836. -------------+---------------------------------------------
  837. 8 bits | 0x301* 0x303 0x305 0x161 0x307
  838. 15 bits | 0x310 0x313 0x316 0x162 0x319
  839. 16 bits | 0x311 0x314 0x317 0x163 0x31A
  840. 24 bits | 0x312 0x315 0x318 ? 0x31B
  841. -------------+---------------------------------------------
  842. (i.e. setenv videomode 317; saveenv; reset;)
  843. - "videomode=bootargs" all the video parameters are parsed
  844. from the bootargs. (See drivers/video/videomodes.c)
  845. CONFIG_VIDEO_SED13806
  846. Enable Epson SED13806 driver. This driver supports 8bpp
  847. and 16bpp modes defined by CONFIG_VIDEO_SED13806_8BPP
  848. or CONFIG_VIDEO_SED13806_16BPP
  849. - Keyboard Support:
  850. CONFIG_KEYBOARD
  851. Define this to enable a custom keyboard support.
  852. This simply calls drv_keyboard_init() which must be
  853. defined in your board-specific files.
  854. The only board using this so far is RBC823.
  855. - LCD Support: CONFIG_LCD
  856. Define this to enable LCD support (for output to LCD
  857. display); also select one of the supported displays
  858. by defining one of these:
  859. CONFIG_ATMEL_LCD:
  860. HITACHI TX09D70VM1CCA, 3.5", 240x320.
  861. CONFIG_NEC_NL6448AC33:
  862. NEC NL6448AC33-18. Active, color, single scan.
  863. CONFIG_NEC_NL6448BC20
  864. NEC NL6448BC20-08. 6.5", 640x480.
  865. Active, color, single scan.
  866. CONFIG_NEC_NL6448BC33_54
  867. NEC NL6448BC33-54. 10.4", 640x480.
  868. Active, color, single scan.
  869. CONFIG_SHARP_16x9
  870. Sharp 320x240. Active, color, single scan.
  871. It isn't 16x9, and I am not sure what it is.
  872. CONFIG_SHARP_LQ64D341
  873. Sharp LQ64D341 display, 640x480.
  874. Active, color, single scan.
  875. CONFIG_HLD1045
  876. HLD1045 display, 640x480.
  877. Active, color, single scan.
  878. CONFIG_OPTREX_BW
  879. Optrex CBL50840-2 NF-FW 99 22 M5
  880. or
  881. Hitachi LMG6912RPFC-00T
  882. or
  883. Hitachi SP14Q002
  884. 320x240. Black & white.
  885. Normally display is black on white background; define
  886. CONFIG_SYS_WHITE_ON_BLACK to get it inverted.
  887. - Splash Screen Support: CONFIG_SPLASH_SCREEN
  888. If this option is set, the environment is checked for
  889. a variable "splashimage". If found, the usual display
  890. of logo, copyright and system information on the LCD
  891. is suppressed and the BMP image at the address
  892. specified in "splashimage" is loaded instead. The
  893. console is redirected to the "nulldev", too. This
  894. allows for a "silent" boot where a splash screen is
  895. loaded very quickly after power-on.
  896. CONFIG_SPLASH_SCREEN_ALIGN
  897. If this option is set the splash image can be freely positioned
  898. on the screen. Environment variable "splashpos" specifies the
  899. position as "x,y". If a positive number is given it is used as
  900. number of pixel from left/top. If a negative number is given it
  901. is used as number of pixel from right/bottom. You can also
  902. specify 'm' for centering the image.
  903. Example:
  904. setenv splashpos m,m
  905. => image at center of screen
  906. setenv splashpos 30,20
  907. => image at x = 30 and y = 20
  908. setenv splashpos -10,m
  909. => vertically centered image
  910. at x = dspWidth - bmpWidth - 9
  911. - Gzip compressed BMP image support: CONFIG_VIDEO_BMP_GZIP
  912. If this option is set, additionally to standard BMP
  913. images, gzipped BMP images can be displayed via the
  914. splashscreen support or the bmp command.
  915. - Run length encoded BMP image (RLE8) support: CONFIG_VIDEO_BMP_RLE8
  916. If this option is set, 8-bit RLE compressed BMP images
  917. can be displayed via the splashscreen support or the
  918. bmp command.
  919. - Compression support:
  920. CONFIG_BZIP2
  921. If this option is set, support for bzip2 compressed
  922. images is included. If not, only uncompressed and gzip
  923. compressed images are supported.
  924. NOTE: the bzip2 algorithm requires a lot of RAM, so
  925. the malloc area (as defined by CONFIG_SYS_MALLOC_LEN) should
  926. be at least 4MB.
  927. CONFIG_LZMA
  928. If this option is set, support for lzma compressed
  929. images is included.
  930. Note: The LZMA algorithm adds between 2 and 4KB of code and it
  931. requires an amount of dynamic memory that is given by the
  932. formula:
  933. (1846 + 768 << (lc + lp)) * sizeof(uint16)
  934. Where lc and lp stand for, respectively, Literal context bits
  935. and Literal pos bits.
  936. This value is upper-bounded by 14MB in the worst case. Anyway,
  937. for a ~4MB large kernel image, we have lc=3 and lp=0 for a
  938. total amount of (1846 + 768 << (3 + 0)) * 2 = ~41KB... that is
  939. a very small buffer.
  940. Use the lzmainfo tool to determinate the lc and lp values and
  941. then calculate the amount of needed dynamic memory (ensuring
  942. the appropriate CONFIG_SYS_MALLOC_LEN value).
  943. - MII/PHY support:
  944. CONFIG_PHY_ADDR
  945. The address of PHY on MII bus.
  946. CONFIG_PHY_CLOCK_FREQ (ppc4xx)
  947. The clock frequency of the MII bus
  948. CONFIG_PHY_GIGE
  949. If this option is set, support for speed/duplex
  950. detection of gigabit PHY is included.
  951. CONFIG_PHY_RESET_DELAY
  952. Some PHY like Intel LXT971A need extra delay after
  953. reset before any MII register access is possible.
  954. For such PHY, set this option to the usec delay
  955. required. (minimum 300usec for LXT971A)
  956. CONFIG_PHY_CMD_DELAY (ppc4xx)
  957. Some PHY like Intel LXT971A need extra delay after
  958. command issued before MII status register can be read
  959. - Ethernet address:
  960. CONFIG_ETHADDR
  961. CONFIG_ETH1ADDR
  962. CONFIG_ETH2ADDR
  963. CONFIG_ETH3ADDR
  964. CONFIG_ETH4ADDR
  965. CONFIG_ETH5ADDR
  966. Define a default value for Ethernet address to use
  967. for the respective Ethernet interface, in case this
  968. is not determined automatically.
  969. - IP address:
  970. CONFIG_IPADDR
  971. Define a default value for the IP address to use for
  972. the default Ethernet interface, in case this is not
  973. determined through e.g. bootp.
  974. - Server IP address:
  975. CONFIG_SERVERIP
  976. Defines a default value for the IP address of a TFTP
  977. server to contact when using the "tftboot" command.
  978. CONFIG_KEEP_SERVERADDR
  979. Keeps the server's MAC address, in the env 'serveraddr'
  980. for passing to bootargs (like Linux's netconsole option)
  981. - Multicast TFTP Mode:
  982. CONFIG_MCAST_TFTP
  983. Defines whether you want to support multicast TFTP as per
  984. rfc-2090; for example to work with atftp. Lets lots of targets
  985. tftp down the same boot image concurrently. Note: the Ethernet
  986. driver in use must provide a function: mcast() to join/leave a
  987. multicast group.
  988. CONFIG_BOOTP_RANDOM_DELAY
  989. - BOOTP Recovery Mode:
  990. CONFIG_BOOTP_RANDOM_DELAY
  991. If you have many targets in a network that try to
  992. boot using BOOTP, you may want to avoid that all
  993. systems send out BOOTP requests at precisely the same
  994. moment (which would happen for instance at recovery
  995. from a power failure, when all systems will try to
  996. boot, thus flooding the BOOTP server. Defining
  997. CONFIG_BOOTP_RANDOM_DELAY causes a random delay to be
  998. inserted before sending out BOOTP requests. The
  999. following delays are inserted then:
  1000. 1st BOOTP request: delay 0 ... 1 sec
  1001. 2nd BOOTP request: delay 0 ... 2 sec
  1002. 3rd BOOTP request: delay 0 ... 4 sec
  1003. 4th and following
  1004. BOOTP requests: delay 0 ... 8 sec
  1005. - DHCP Advanced Options:
  1006. You can fine tune the DHCP functionality by defining
  1007. CONFIG_BOOTP_* symbols:
  1008. CONFIG_BOOTP_SUBNETMASK
  1009. CONFIG_BOOTP_GATEWAY
  1010. CONFIG_BOOTP_HOSTNAME
  1011. CONFIG_BOOTP_NISDOMAIN
  1012. CONFIG_BOOTP_BOOTPATH
  1013. CONFIG_BOOTP_BOOTFILESIZE
  1014. CONFIG_BOOTP_DNS
  1015. CONFIG_BOOTP_DNS2
  1016. CONFIG_BOOTP_SEND_HOSTNAME
  1017. CONFIG_BOOTP_NTPSERVER
  1018. CONFIG_BOOTP_TIMEOFFSET
  1019. CONFIG_BOOTP_VENDOREX
  1020. CONFIG_BOOTP_SERVERIP - TFTP server will be the serverip
  1021. environment variable, not the BOOTP server.
  1022. CONFIG_BOOTP_DNS2 - If a DHCP client requests the DNS
  1023. serverip from a DHCP server, it is possible that more
  1024. than one DNS serverip is offered to the client.
  1025. If CONFIG_BOOTP_DNS2 is enabled, the secondary DNS
  1026. serverip will be stored in the additional environment
  1027. variable "dnsip2". The first DNS serverip is always
  1028. stored in the variable "dnsip", when CONFIG_BOOTP_DNS
  1029. is defined.
  1030. CONFIG_BOOTP_SEND_HOSTNAME - Some DHCP servers are capable
  1031. to do a dynamic update of a DNS server. To do this, they
  1032. need the hostname of the DHCP requester.
  1033. If CONFIG_BOOTP_SEND_HOSTNAME is defined, the content
  1034. of the "hostname" environment variable is passed as
  1035. option 12 to the DHCP server.
  1036. CONFIG_BOOTP_DHCP_REQUEST_DELAY
  1037. A 32bit value in microseconds for a delay between
  1038. receiving a "DHCP Offer" and sending the "DHCP Request".
  1039. This fixes a problem with certain DHCP servers that don't
  1040. respond 100% of the time to a "DHCP request". E.g. On an
  1041. AT91RM9200 processor running at 180MHz, this delay needed
  1042. to be *at least* 15,000 usec before a Windows Server 2003
  1043. DHCP server would reply 100% of the time. I recommend at
  1044. least 50,000 usec to be safe. The alternative is to hope
  1045. that one of the retries will be successful but note that
  1046. the DHCP timeout and retry process takes a longer than
  1047. this delay.
  1048. - CDP Options:
  1049. CONFIG_CDP_DEVICE_ID
  1050. The device id used in CDP trigger frames.
  1051. CONFIG_CDP_DEVICE_ID_PREFIX
  1052. A two character string which is prefixed to the MAC address
  1053. of the device.
  1054. CONFIG_CDP_PORT_ID
  1055. A printf format string which contains the ascii name of
  1056. the port. Normally is set to "eth%d" which sets
  1057. eth0 for the first Ethernet, eth1 for the second etc.
  1058. CONFIG_CDP_CAPABILITIES
  1059. A 32bit integer which indicates the device capabilities;
  1060. 0x00000010 for a normal host which does not forwards.
  1061. CONFIG_CDP_VERSION
  1062. An ascii string containing the version of the software.
  1063. CONFIG_CDP_PLATFORM
  1064. An ascii string containing the name of the platform.
  1065. CONFIG_CDP_TRIGGER
  1066. A 32bit integer sent on the trigger.
  1067. CONFIG_CDP_POWER_CONSUMPTION
  1068. A 16bit integer containing the power consumption of the
  1069. device in .1 of milliwatts.
  1070. CONFIG_CDP_APPLIANCE_VLAN_TYPE
  1071. A byte containing the id of the VLAN.
  1072. - Status LED: CONFIG_STATUS_LED
  1073. Several configurations allow to display the current
  1074. status using a LED. For instance, the LED will blink
  1075. fast while running U-Boot code, stop blinking as
  1076. soon as a reply to a BOOTP request was received, and
  1077. start blinking slow once the Linux kernel is running
  1078. (supported by a status LED driver in the Linux
  1079. kernel). Defining CONFIG_STATUS_LED enables this
  1080. feature in U-Boot.
  1081. - CAN Support: CONFIG_CAN_DRIVER
  1082. Defining CONFIG_CAN_DRIVER enables CAN driver support
  1083. on those systems that support this (optional)
  1084. feature, like the TQM8xxL modules.
  1085. - I2C Support: CONFIG_HARD_I2C | CONFIG_SOFT_I2C
  1086. These enable I2C serial bus commands. Defining either of
  1087. (but not both of) CONFIG_HARD_I2C or CONFIG_SOFT_I2C will
  1088. include the appropriate I2C driver for the selected CPU.
  1089. This will allow you to use i2c commands at the u-boot
  1090. command line (as long as you set CONFIG_CMD_I2C in
  1091. CONFIG_COMMANDS) and communicate with i2c based realtime
  1092. clock chips. See common/cmd_i2c.c for a description of the
  1093. command line interface.
  1094. CONFIG_HARD_I2C selects a hardware I2C controller.
  1095. CONFIG_SOFT_I2C configures u-boot to use a software (aka
  1096. bit-banging) driver instead of CPM or similar hardware
  1097. support for I2C.
  1098. There are several other quantities that must also be
  1099. defined when you define CONFIG_HARD_I2C or CONFIG_SOFT_I2C.
  1100. In both cases you will need to define CONFIG_SYS_I2C_SPEED
  1101. to be the frequency (in Hz) at which you wish your i2c bus
  1102. to run and CONFIG_SYS_I2C_SLAVE to be the address of this node (ie
  1103. the CPU's i2c node address).
  1104. Now, the u-boot i2c code for the mpc8xx
  1105. (arch/powerpc/cpu/mpc8xx/i2c.c) sets the CPU up as a master node
  1106. and so its address should therefore be cleared to 0 (See,
  1107. eg, MPC823e User's Manual p.16-473). So, set
  1108. CONFIG_SYS_I2C_SLAVE to 0.
  1109. CONFIG_SYS_I2C_INIT_MPC5XXX
  1110. When a board is reset during an i2c bus transfer
  1111. chips might think that the current transfer is still
  1112. in progress. Reset the slave devices by sending start
  1113. commands until the slave device responds.
  1114. That's all that's required for CONFIG_HARD_I2C.
  1115. If you use the software i2c interface (CONFIG_SOFT_I2C)
  1116. then the following macros need to be defined (examples are
  1117. from include/configs/lwmon.h):
  1118. I2C_INIT
  1119. (Optional). Any commands necessary to enable the I2C
  1120. controller or configure ports.
  1121. eg: #define I2C_INIT (immr->im_cpm.cp_pbdir |= PB_SCL)
  1122. I2C_PORT
  1123. (Only for MPC8260 CPU). The I/O port to use (the code
  1124. assumes both bits are on the same port). Valid values
  1125. are 0..3 for ports A..D.
  1126. I2C_ACTIVE
  1127. The code necessary to make the I2C data line active
  1128. (driven). If the data line is open collector, this
  1129. define can be null.
  1130. eg: #define I2C_ACTIVE (immr->im_cpm.cp_pbdir |= PB_SDA)
  1131. I2C_TRISTATE
  1132. The code necessary to make the I2C data line tri-stated
  1133. (inactive). If the data line is open collector, this
  1134. define can be null.
  1135. eg: #define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA)
  1136. I2C_READ
  1137. Code that returns TRUE if the I2C data line is high,
  1138. FALSE if it is low.
  1139. eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0)
  1140. I2C_SDA(bit)
  1141. If <bit> is TRUE, sets the I2C data line high. If it
  1142. is FALSE, it clears it (low).
  1143. eg: #define I2C_SDA(bit) \
  1144. if(bit) immr->im_cpm.cp_pbdat |= PB_SDA; \
  1145. else immr->im_cpm.cp_pbdat &= ~PB_SDA
  1146. I2C_SCL(bit)
  1147. If <bit> is TRUE, sets the I2C clock line high. If it
  1148. is FALSE, it clears it (low).
  1149. eg: #define I2C_SCL(bit) \
  1150. if(bit) immr->im_cpm.cp_pbdat |= PB_SCL; \
  1151. else immr->im_cpm.cp_pbdat &= ~PB_SCL
  1152. I2C_DELAY
  1153. This delay is invoked four times per clock cycle so this
  1154. controls the rate of data transfer. The data rate thus
  1155. is 1 / (I2C_DELAY * 4). Often defined to be something
  1156. like:
  1157. #define I2C_DELAY udelay(2)
  1158. CONFIG_SOFT_I2C_GPIO_SCL / CONFIG_SOFT_I2C_GPIO_SDA
  1159. If your arch supports the generic GPIO framework (asm/gpio.h),
  1160. then you may alternatively define the two GPIOs that are to be
  1161. used as SCL / SDA. Any of the previous I2C_xxx macros will
  1162. have GPIO-based defaults assigned to them as appropriate.
  1163. You should define these to the GPIO value as given directly to
  1164. the generic GPIO functions.
  1165. CONFIG_SYS_I2C_INIT_BOARD
  1166. When a board is reset during an i2c bus transfer
  1167. chips might think that the current transfer is still
  1168. in progress. On some boards it is possible to access
  1169. the i2c SCLK line directly, either by using the
  1170. processor pin as a GPIO or by having a second pin
  1171. connected to the bus. If this option is defined a
  1172. custom i2c_init_board() routine in boards/xxx/board.c
  1173. is run early in the boot sequence.
  1174. CONFIG_SYS_I2C_BOARD_LATE_INIT
  1175. An alternative to CONFIG_SYS_I2C_INIT_BOARD. If this option is
  1176. defined a custom i2c_board_late_init() routine in
  1177. boards/xxx/board.c is run AFTER the operations in i2c_init()
  1178. is completed. This callpoint can be used to unreset i2c bus
  1179. using CPU i2c controller register accesses for CPUs whose i2c
  1180. controller provide such a method. It is called at the end of
  1181. i2c_init() to allow i2c_init operations to setup the i2c bus
  1182. controller on the CPU (e.g. setting bus speed & slave address).
  1183. CONFIG_I2CFAST (PPC405GP|PPC405EP only)
  1184. This option enables configuration of bi_iic_fast[] flags
  1185. in u-boot bd_info structure based on u-boot environment
  1186. variable "i2cfast". (see also i2cfast)
  1187. CONFIG_I2C_MULTI_BUS
  1188. This option allows the use of multiple I2C buses, each of which
  1189. must have a controller. At any point in time, only one bus is
  1190. active. To switch to a different bus, use the 'i2c dev' command.
  1191. Note that bus numbering is zero-based.
  1192. CONFIG_SYS_I2C_NOPROBES
  1193. This option specifies a list of I2C devices that will be skipped
  1194. when the 'i2c probe' command is issued. If CONFIG_I2C_MULTI_BUS
  1195. is set, specify a list of bus-device pairs. Otherwise, specify
  1196. a 1D array of device addresses
  1197. e.g.
  1198. #undef CONFIG_I2C_MULTI_BUS
  1199. #define CONFIG_SYS_I2C_NOPROBES {0x50,0x68}
  1200. will skip addresses 0x50 and 0x68 on a board with one I2C bus
  1201. #define CONFIG_I2C_MULTI_BUS
  1202. #define CONFIG_SYS_I2C_MULTI_NOPROBES {{0,0x50},{0,0x68},{1,0x54}}
  1203. will skip addresses 0x50 and 0x68 on bus 0 and address 0x54 on bus 1
  1204. CONFIG_SYS_SPD_BUS_NUM
  1205. If defined, then this indicates the I2C bus number for DDR SPD.
  1206. If not defined, then U-Boot assumes that SPD is on I2C bus 0.
  1207. CONFIG_SYS_RTC_BUS_NUM
  1208. If defined, then this indicates the I2C bus number for the RTC.
  1209. If not defined, then U-Boot assumes that RTC is on I2C bus 0.
  1210. CONFIG_SYS_DTT_BUS_NUM
  1211. If defined, then this indicates the I2C bus number for the DTT.
  1212. If not defined, then U-Boot assumes that DTT is on I2C bus 0.
  1213. CONFIG_SYS_I2C_DTT_ADDR:
  1214. If defined, specifies the I2C address of the DTT device.
  1215. If not defined, then U-Boot uses predefined value for
  1216. specified DTT device.
  1217. CONFIG_FSL_I2C
  1218. Define this option if you want to use Freescale's I2C driver in
  1219. drivers/i2c/fsl_i2c.c.
  1220. CONFIG_I2C_MUX
  1221. Define this option if you have I2C devices reached over 1 .. n
  1222. I2C Muxes like the pca9544a. This option addes a new I2C
  1223. Command "i2c bus [muxtype:muxaddr:muxchannel]" which adds a
  1224. new I2C Bus to the existing I2C Busses. If you select the
  1225. new Bus with "i2c dev", u-bbot sends first the commandos for
  1226. the muxes to activate this new "bus".
  1227. CONFIG_I2C_MULTI_BUS must be also defined, to use this
  1228. feature!
  1229. Example:
  1230. Adding a new I2C Bus reached over 2 pca9544a muxes
  1231. The First mux with address 70 and channel 6
  1232. The Second mux with address 71 and channel 4
  1233. => i2c bus pca9544a:70:6:pca9544a:71:4
  1234. Use the "i2c bus" command without parameter, to get a list
  1235. of I2C Busses with muxes:
  1236. => i2c bus
  1237. Busses reached over muxes:
  1238. Bus ID: 2
  1239. reached over Mux(es):
  1240. pca9544a@70 ch: 4
  1241. Bus ID: 3
  1242. reached over Mux(es):
  1243. pca9544a@70 ch: 6
  1244. pca9544a@71 ch: 4
  1245. =>
  1246. If you now switch to the new I2C Bus 3 with "i2c dev 3"
  1247. u-boot sends First the Commando to the mux@70 to enable
  1248. channel 6, and then the Commando to the mux@71 to enable
  1249. the channel 4.
  1250. After that, you can use the "normal" i2c commands as
  1251. usual, to communicate with your I2C devices behind
  1252. the 2 muxes.
  1253. This option is actually implemented for the bitbanging
  1254. algorithm in common/soft_i2c.c and for the Hardware I2C
  1255. Bus on the MPC8260. But it should be not so difficult
  1256. to add this option to other architectures.
  1257. CONFIG_SOFT_I2C_READ_REPEATED_START
  1258. defining this will force the i2c_read() function in
  1259. the soft_i2c driver to perform an I2C repeated start
  1260. between writing the address pointer and reading the
  1261. data. If this define is omitted the default behaviour
  1262. of doing a stop-start sequence will be used. Most I2C
  1263. devices can use either method, but some require one or
  1264. the other.
  1265. - SPI Support: CONFIG_SPI
  1266. Enables SPI driver (so far only tested with
  1267. SPI EEPROM, also an instance works with Crystal A/D and
  1268. D/As on the SACSng board)
  1269. CONFIG_SPI_X
  1270. Enables extended (16-bit) SPI EEPROM addressing.
  1271. (symmetrical to CONFIG_I2C_X)
  1272. CONFIG_SOFT_SPI
  1273. Enables a software (bit-bang) SPI driver rather than
  1274. using hardware support. This is a general purpose
  1275. driver that only requires three general I/O port pins
  1276. (two outputs, one input) to function. If this is
  1277. defined, the board configuration must define several
  1278. SPI configuration items (port pins to use, etc). For
  1279. an example, see include/configs/sacsng.h.
  1280. CONFIG_HARD_SPI
  1281. Enables a hardware SPI driver for general-purpose reads
  1282. and writes. As with CONFIG_SOFT_SPI, the board configuration
  1283. must define a list of chip-select function pointers.
  1284. Currently supported on some MPC8xxx processors. For an
  1285. example, see include/configs/mpc8349emds.h.
  1286. CONFIG_MXC_SPI
  1287. Enables the driver for the SPI controllers on i.MX and MXC
  1288. SoCs. Currently only i.MX31 is supported.
  1289. - FPGA Support: CONFIG_FPGA
  1290. Enables FPGA subsystem.
  1291. CONFIG_FPGA_<vendor>
  1292. Enables support for specific chip vendors.
  1293. (ALTERA, XILINX)
  1294. CONFIG_FPGA_<family>
  1295. Enables support for FPGA family.
  1296. (SPARTAN2, SPARTAN3, VIRTEX2, CYCLONE2, ACEX1K, ACEX)
  1297. CONFIG_FPGA_COUNT
  1298. Specify the number of FPGA devices to support.
  1299. CONFIG_SYS_FPGA_PROG_FEEDBACK
  1300. Enable printing of hash marks during FPGA configuration.
  1301. CONFIG_SYS_FPGA_CHECK_BUSY
  1302. Enable checks on FPGA configuration interface busy
  1303. status by the configuration function. This option
  1304. will require a board or device specific function to
  1305. be written.
  1306. CONFIG_FPGA_DELAY
  1307. If defined, a function that provides delays in the FPGA
  1308. configuration driver.
  1309. CONFIG_SYS_FPGA_CHECK_CTRLC
  1310. Allow Control-C to interrupt FPGA configuration
  1311. CONFIG_SYS_FPGA_CHECK_ERROR
  1312. Check for configuration errors during FPGA bitfile
  1313. loading. For example, abort during Virtex II
  1314. configuration if the INIT_B line goes low (which
  1315. indicated a CRC error).
  1316. CONFIG_SYS_FPGA_WAIT_INIT
  1317. Maximum time to wait for the INIT_B line to deassert
  1318. after PROB_B has been deasserted during a Virtex II
  1319. FPGA configuration sequence. The default time is 500
  1320. ms.
  1321. CONFIG_SYS_FPGA_WAIT_BUSY
  1322. Maximum time to wait for BUSY to deassert during
  1323. Virtex II FPGA configuration. The default is 5 ms.
  1324. CONFIG_SYS_FPGA_WAIT_CONFIG
  1325. Time to wait after FPGA configuration. The default is
  1326. 200 ms.
  1327. - Configuration Management:
  1328. CONFIG_IDENT_STRING
  1329. If defined, this string will be added to the U-Boot
  1330. version information (U_BOOT_VERSION)
  1331. - Vendor Parameter Protection:
  1332. U-Boot considers the values of the environment
  1333. variables "serial#" (Board Serial Number) and
  1334. "ethaddr" (Ethernet Address) to be parameters that
  1335. are set once by the board vendor / manufacturer, and
  1336. protects these variables from casual modification by
  1337. the user. Once set, these variables are read-only,
  1338. and write or delete attempts are rejected. You can
  1339. change this behaviour:
  1340. If CONFIG_ENV_OVERWRITE is #defined in your config
  1341. file, the write protection for vendor parameters is
  1342. completely disabled. Anybody can change or delete
  1343. these parameters.
  1344. Alternatively, if you #define _both_ CONFIG_ETHADDR
  1345. _and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default
  1346. Ethernet address is installed in the environment,
  1347. which can be changed exactly ONCE by the user. [The
  1348. serial# is unaffected by this, i. e. it remains
  1349. read-only.]
  1350. - Protected RAM:
  1351. CONFIG_PRAM
  1352. Define this variable to enable the reservation of
  1353. "protected RAM", i. e. RAM which is not overwritten
  1354. by U-Boot. Define CONFIG_PRAM to hold the number of
  1355. kB you want to reserve for pRAM. You can overwrite
  1356. this default value by defining an environment
  1357. variable "pram" to the number of kB you want to
  1358. reserve. Note that the board info structure will
  1359. still show the full amount of RAM. If pRAM is
  1360. reserved, a new environment variable "mem" will
  1361. automatically be defined to hold the amount of
  1362. remaining RAM in a form that can be passed as boot
  1363. argument to Linux, for instance like that:
  1364. setenv bootargs ... mem=\${mem}
  1365. saveenv
  1366. This way you can tell Linux not to use this memory,
  1367. either, which results in a memory region that will
  1368. not be affected by reboots.
  1369. *WARNING* If your board configuration uses automatic
  1370. detection of the RAM size, you must make sure that
  1371. this memory test is non-destructive. So far, the
  1372. following board configurations are known to be
  1373. "pRAM-clean":
  1374. ETX094, IVMS8, IVML24, SPD8xx, TQM8xxL,
  1375. HERMES, IP860, RPXlite, LWMON, LANTEC,
  1376. PCU_E, FLAGADM, TQM8260
  1377. - Error Recovery:
  1378. CONFIG_PANIC_HANG
  1379. Define this variable to stop the system in case of a
  1380. fatal error, so that you have to reset it manually.
  1381. This is probably NOT a good idea for an embedded
  1382. system where you want the system to reboot
  1383. automatically as fast as possible, but it may be
  1384. useful during development since you can try to debug
  1385. the conditions that lead to the situation.
  1386. CONFIG_NET_RETRY_COUNT
  1387. This variable defines the number of retries for
  1388. network operations like ARP, RARP, TFTP, or BOOTP
  1389. before giving up the operation. If not defined, a
  1390. default value of 5 is used.
  1391. CONFIG_ARP_TIMEOUT
  1392. Timeout waiting for an ARP reply in milliseconds.
  1393. - Command Interpreter:
  1394. CONFIG_AUTO_COMPLETE
  1395. Enable auto completion of commands using TAB.
  1396. Note that this feature has NOT been implemented yet
  1397. for the "hush" shell.
  1398. CONFIG_SYS_HUSH_PARSER
  1399. Define this variable to enable the "hush" shell (from
  1400. Busybox) as command line interpreter, thus enabling
  1401. powerful command line syntax like
  1402. if...then...else...fi conditionals or `&&' and '||'
  1403. constructs ("shell scripts").
  1404. If undefined, you get the old, much simpler behaviour
  1405. with a somewhat smaller memory footprint.
  1406. CONFIG_SYS_PROMPT_HUSH_PS2
  1407. This defines the secondary prompt string, which is
  1408. printed when the command interpreter needs more input
  1409. to complete a command. Usually "> ".
  1410. Note:
  1411. In the current implementation, the local variables
  1412. space and global environment variables space are
  1413. separated. Local variables are those you define by
  1414. simply typing `name=value'. To access a local
  1415. variable later on, you have write `$name' or
  1416. `${name}'; to execute the contents of a variable
  1417. directly type `$name' at the command prompt.
  1418. Global environment variables are those you use
  1419. setenv/printenv to work with. To run a command stored
  1420. in such a variable, you need to use the run command,
  1421. and you must not use the '$' sign to access them.
  1422. To store commands and special characters in a
  1423. variable, please use double quotation marks
  1424. surrounding the whole text of the variable, instead
  1425. of the backslashes before semicolons and special
  1426. symbols.
  1427. - Commandline Editing and History:
  1428. CONFIG_CMDLINE_EDITING
  1429. Enable editing and History functions for interactive
  1430. commandline input operations
  1431. - Default Environment:
  1432. CONFIG_EXTRA_ENV_SETTINGS
  1433. Define this to contain any number of null terminated
  1434. strings (variable = value pairs) that will be part of
  1435. the default environment compiled into the boot image.
  1436. For example, place something like this in your
  1437. board's config file:
  1438. #define CONFIG_EXTRA_ENV_SETTINGS \
  1439. "myvar1=value1\0" \
  1440. "myvar2=value2\0"
  1441. Warning: This method is based on knowledge about the
  1442. internal format how the environment is stored by the
  1443. U-Boot code. This is NOT an official, exported
  1444. interface! Although it is unlikely that this format
  1445. will change soon, there is no guarantee either.
  1446. You better know what you are doing here.
  1447. Note: overly (ab)use of the default environment is
  1448. discouraged. Make sure to check other ways to preset
  1449. the environment like the "source" command or the
  1450. boot command first.
  1451. - DataFlash Support:
  1452. CONFIG_HAS_DATAFLASH
  1453. Defining this option enables DataFlash features and
  1454. allows to read/write in Dataflash via the standard
  1455. commands cp, md...
  1456. - SystemACE Support:
  1457. CONFIG_SYSTEMACE
  1458. Adding this option adds support for Xilinx SystemACE
  1459. chips attached via some sort of local bus. The address
  1460. of the chip must also be defined in the
  1461. CONFIG_SYS_SYSTEMACE_BASE macro. For example:
  1462. #define CONFIG_SYSTEMACE
  1463. #define CONFIG_SYS_SYSTEMACE_BASE 0xf0000000
  1464. When SystemACE support is added, the "ace" device type
  1465. becomes available to the fat commands, i.e. fatls.
  1466. - TFTP Fixed UDP Port:
  1467. CONFIG_TFTP_PORT
  1468. If this is defined, the environment variable tftpsrcp
  1469. is used to supply the TFTP UDP source port value.
  1470. If tftpsrcp isn't defined, the normal pseudo-random port
  1471. number generator is used.
  1472. Also, the environment variable tftpdstp is used to supply
  1473. the TFTP UDP destination port value. If tftpdstp isn't
  1474. defined, the normal port 69 is used.
  1475. The purpose for tftpsrcp is to allow a TFTP server to
  1476. blindly start the TFTP transfer using the pre-configured
  1477. target IP address and UDP port. This has the effect of
  1478. "punching through" the (Windows XP) firewall, allowing
  1479. the remainder of the TFTP transfer to proceed normally.
  1480. A better solution is to properly configure the firewall,
  1481. but sometimes that is not allowed.
  1482. - Show boot progress:
  1483. CONFIG_SHOW_BOOT_PROGRESS
  1484. Defining this option allows to add some board-
  1485. specific code (calling a user-provided function
  1486. "show_boot_progress(int)") that enables you to show
  1487. the system's boot progress on some display (for
  1488. example, some LED's) on your board. At the moment,
  1489. the following checkpoints are implemented:
  1490. Legacy uImage format:
  1491. Arg Where When
  1492. 1 common/cmd_bootm.c before attempting to boot an image
  1493. -1 common/cmd_bootm.c Image header has bad magic number
  1494. 2 common/cmd_bootm.c Image header has correct magic number
  1495. -2 common/cmd_bootm.c Image header has bad checksum
  1496. 3 common/cmd_bootm.c Image header has correct checksum
  1497. -3 common/cmd_bootm.c Image data has bad checksum
  1498. 4 common/cmd_bootm.c Image data has correct checksum
  1499. -4 common/cmd_bootm.c Image is for unsupported architecture
  1500. 5 common/cmd_bootm.c Architecture check OK
  1501. -5 common/cmd_bootm.c Wrong Image Type (not kernel, multi)
  1502. 6 common/cmd_bootm.c Image Type check OK
  1503. -6 common/cmd_bootm.c gunzip uncompression error
  1504. -7 common/cmd_bootm.c Unimplemented compression type
  1505. 7 common/cmd_bootm.c Uncompression OK
  1506. 8 common/cmd_bootm.c No uncompress/copy overwrite error
  1507. -9 common/cmd_bootm.c Unsupported OS (not Linux, BSD, VxWorks, QNX)
  1508. 9 common/image.c Start initial ramdisk verification
  1509. -10 common/image.c Ramdisk header has bad magic number
  1510. -11 common/image.c Ramdisk header has bad checksum
  1511. 10 common/image.c Ramdisk header is OK
  1512. -12 common/image.c Ramdisk data has bad checksum
  1513. 11 common/image.c Ramdisk data has correct checksum
  1514. 12 common/image.c Ramdisk verification complete, start loading
  1515. -13 common/image.c Wrong Image Type (not PPC Linux ramdisk)
  1516. 13 common/image.c Start multifile image verification
  1517. 14 common/image.c No initial ramdisk, no multifile, continue.
  1518. 15 arch/<arch>/lib/bootm.c All preparation done, transferring control to OS
  1519. -30 arch/powerpc/lib/board.c Fatal error, hang the system
  1520. -31 post/post.c POST test failed, detected by post_output_backlog()
  1521. -32 post/post.c POST test failed, detected by post_run_single()
  1522. 34 common/cmd_doc.c before loading a Image from a DOC device
  1523. -35 common/cmd_doc.c Bad usage of "doc" command
  1524. 35 common/cmd_doc.c correct usage of "doc" command
  1525. -36 common/cmd_doc.c No boot device
  1526. 36 common/cmd_doc.c correct boot device
  1527. -37 common/cmd_doc.c Unknown Chip ID on boot device
  1528. 37 common/cmd_doc.c correct chip ID found, device available
  1529. -38 common/cmd_doc.c Read Error on boot device
  1530. 38 common/cmd_doc.c reading Image header from DOC device OK
  1531. -39 common/cmd_doc.c Image header has bad magic number
  1532. 39 common/cmd_doc.c Image header has correct magic number
  1533. -40 common/cmd_doc.c Error reading Image from DOC device
  1534. 40 common/cmd_doc.c Image header has correct magic number
  1535. 41 common/cmd_ide.c before loading a Image from a IDE device
  1536. -42 common/cmd_ide.c Bad usage of "ide" command
  1537. 42 common/cmd_ide.c correct usage of "ide" command
  1538. -43 common/cmd_ide.c No boot device
  1539. 43 common/cmd_ide.c boot device found
  1540. -44 common/cmd_ide.c Device not available
  1541. 44 common/cmd_ide.c Device available
  1542. -45 common/cmd_ide.c wrong partition selected
  1543. 45 common/cmd_ide.c partition selected
  1544. -46 common/cmd_ide.c Unknown partition table
  1545. 46 common/cmd_ide.c valid partition table found
  1546. -47 common/cmd_ide.c Invalid partition type
  1547. 47 common/cmd_ide.c correct partition type
  1548. -48 common/cmd_ide.c Error reading Image Header on boot device
  1549. 48 common/cmd_ide.c reading Image Header from IDE device OK
  1550. -49 common/cmd_ide.c Image header has bad magic number
  1551. 49 common/cmd_ide.c Image header has correct magic number
  1552. -50 common/cmd_ide.c Image header has bad checksum
  1553. 50 common/cmd_ide.c Image header has correct checksum
  1554. -51 common/cmd_ide.c Error reading Image from IDE device
  1555. 51 common/cmd_ide.c reading Image from IDE device OK
  1556. 52 common/cmd_nand.c before loading a Image from a NAND device
  1557. -53 common/cmd_nand.c Bad usage of "nand" command
  1558. 53 common/cmd_nand.c correct usage of "nand" command
  1559. -54 common/cmd_nand.c No boot device
  1560. 54 common/cmd_nand.c boot device found
  1561. -55 common/cmd_nand.c Unknown Chip ID on boot device
  1562. 55 common/cmd_nand.c correct chip ID found, device available
  1563. -56 common/cmd_nand.c Error reading Image Header on boot device
  1564. 56 common/cmd_nand.c reading Image Header from NAND device OK
  1565. -57 common/cmd_nand.c Image header has bad magic number
  1566. 57 common/cmd_nand.c Image header has correct magic number
  1567. -58 common/cmd_nand.c Error reading Image from NAND device
  1568. 58 common/cmd_nand.c reading Image from NAND device OK
  1569. -60 common/env_common.c Environment has a bad CRC, using default
  1570. 64 net/eth.c starting with Ethernet configuration.
  1571. -64 net/eth.c no Ethernet found.
  1572. 65 net/eth.c Ethernet found.
  1573. -80 common/cmd_net.c usage wrong
  1574. 80 common/cmd_net.c before calling NetLoop()
  1575. -81 common/cmd_net.c some error in NetLoop() occurred
  1576. 81 common/cmd_net.c NetLoop() back without error
  1577. -82 common/cmd_net.c size == 0 (File with size 0 loaded)
  1578. 82 common/cmd_net.c trying automatic boot
  1579. 83 common/cmd_net.c running "source" command
  1580. -83 common/cmd_net.c some error in automatic boot or "source" command
  1581. 84 common/cmd_net.c end without errors
  1582. FIT uImage format:
  1583. Arg Where When
  1584. 100 common/cmd_bootm.c Kernel FIT Image has correct format
  1585. -100 common/cmd_bootm.c Kernel FIT Image has incorrect format
  1586. 101 common/cmd_bootm.c No Kernel subimage unit name, using configuration
  1587. -101 common/cmd_bootm.c Can't get configuration for kernel subimage
  1588. 102 common/cmd_bootm.c Kernel unit name specified
  1589. -103 common/cmd_bootm.c Can't get kernel subimage node offset
  1590. 103 common/cmd_bootm.c Found configuration node
  1591. 104 common/cmd_bootm.c Got kernel subimage node offset
  1592. -104 common/cmd_bootm.c Kernel subimage hash verification failed
  1593. 105 common/cmd_bootm.c Kernel subimage hash verification OK
  1594. -105 common/cmd_bootm.c Kernel subimage is for unsupported architecture
  1595. 106 common/cmd_bootm.c Architecture check OK
  1596. -106 common/cmd_bootm.c Kernel subimage has wrong type
  1597. 107 common/cmd_bootm.c Kernel subimage type OK
  1598. -107 common/cmd_bootm.c Can't get kernel subimage data/size
  1599. 108 common/cmd_bootm.c Got kernel subimage data/size
  1600. -108 common/cmd_bootm.c Wrong image type (not legacy, FIT)
  1601. -109 common/cmd_bootm.c Can't get kernel subimage type
  1602. -110 common/cmd_bootm.c Can't get kernel subimage comp
  1603. -111 common/cmd_bootm.c Can't get kernel subimage os
  1604. -112 common/cmd_bootm.c Can't get kernel subimage load address
  1605. -113 common/cmd_bootm.c Image uncompress/copy overwrite error
  1606. 120 common/image.c Start initial ramdisk verification
  1607. -120 common/image.c Ramdisk FIT image has incorrect format
  1608. 121 common/image.c Ramdisk FIT image has correct format
  1609. 122 common/image.c No ramdisk subimage unit name, using configuration
  1610. -122 common/image.c Can't get configuration for ramdisk subimage
  1611. 123 common/image.c Ramdisk unit name specified
  1612. -124 common/image.c Can't get ramdisk subimage node offset
  1613. 125 common/image.c Got ramdisk subimage node offset
  1614. -125 common/image.c Ramdisk subimage hash verification failed
  1615. 126 common/image.c Ramdisk subimage hash verification OK
  1616. -126 common/image.c Ramdisk subimage for unsupported architecture
  1617. 127 common/image.c Architecture check OK
  1618. -127 common/image.c Can't get ramdisk subimage data/size
  1619. 128 common/image.c Got ramdisk subimage data/size
  1620. 129 common/image.c Can't get ramdisk load address
  1621. -129 common/image.c Got ramdisk load address
  1622. -130 common/cmd_doc.c Incorrect FIT image format
  1623. 131 common/cmd_doc.c FIT image format OK
  1624. -140 common/cmd_ide.c Incorrect FIT image format
  1625. 141 common/cmd_ide.c FIT image format OK
  1626. -150 common/cmd_nand.c Incorrect FIT image format
  1627. 151 common/cmd_nand.c FIT image format OK
  1628. - Automatic software updates via TFTP server
  1629. CONFIG_UPDATE_TFTP
  1630. CONFIG_UPDATE_TFTP_CNT_MAX
  1631. CONFIG_UPDATE_TFTP_MSEC_MAX
  1632. These options enable and control the auto-update feature;
  1633. for a more detailed description refer to doc/README.update.
  1634. - MTD Support (mtdparts command, UBI support)
  1635. CONFIG_MTD_DEVICE
  1636. Adds the MTD device infrastructure from the Linux kernel.
  1637. Needed for mtdparts command support.
  1638. CONFIG_MTD_PARTITIONS
  1639. Adds the MTD partitioning infrastructure from the Linux
  1640. kernel. Needed for UBI support.
  1641. Modem Support:
  1642. --------------
  1643. [so far only for SMDK2400 and TRAB boards]
  1644. - Modem support enable:
  1645. CONFIG_MODEM_SUPPORT
  1646. - RTS/CTS Flow control enable:
  1647. CONFIG_HWFLOW
  1648. - Modem debug support:
  1649. CONFIG_MODEM_SUPPORT_DEBUG
  1650. Enables debugging stuff (char screen[1024], dbg())
  1651. for modem support. Useful only with BDI2000.
  1652. - Interrupt support (PPC):
  1653. There are common interrupt_init() and timer_interrupt()
  1654. for all PPC archs. interrupt_init() calls interrupt_init_cpu()
  1655. for CPU specific initialization. interrupt_init_cpu()
  1656. should set decrementer_count to appropriate value. If
  1657. CPU resets decrementer automatically after interrupt
  1658. (ppc4xx) it should set decrementer_count to zero.
  1659. timer_interrupt() calls timer_interrupt_cpu() for CPU
  1660. specific handling. If board has watchdog / status_led
  1661. / other_activity_monitor it works automatically from
  1662. general timer_interrupt().
  1663. - General:
  1664. In the target system modem support is enabled when a
  1665. specific key (key combination) is pressed during
  1666. power-on. Otherwise U-Boot will boot normally
  1667. (autoboot). The key_pressed() function is called from
  1668. board_init(). Currently key_pressed() is a dummy
  1669. function, returning 1 and thus enabling modem
  1670. initialization.
  1671. If there are no modem init strings in the
  1672. environment, U-Boot proceed to autoboot; the
  1673. previous output (banner, info printfs) will be
  1674. suppressed, though.
  1675. See also: doc/README.Modem
  1676. Configuration Settings:
  1677. -----------------------
  1678. - CONFIG_SYS_LONGHELP: Defined when you want long help messages included;
  1679. undefine this when you're short of memory.
  1680. - CONFIG_SYS_HELP_CMD_WIDTH: Defined when you want to override the default
  1681. width of the commands listed in the 'help' command output.
  1682. - CONFIG_SYS_PROMPT: This is what U-Boot prints on the console to
  1683. prompt for user input.
  1684. - CONFIG_SYS_CBSIZE: Buffer size for input from the Console
  1685. - CONFIG_SYS_PBSIZE: Buffer size for Console output
  1686. - CONFIG_SYS_MAXARGS: max. Number of arguments accepted for monitor commands
  1687. - CONFIG_SYS_BARGSIZE: Buffer size for Boot Arguments which are passed to
  1688. the application (usually a Linux kernel) when it is
  1689. booted
  1690. - CONFIG_SYS_BAUDRATE_TABLE:
  1691. List of legal baudrate settings for this board.
  1692. - CONFIG_SYS_CONSOLE_INFO_QUIET
  1693. Suppress display of console information at boot.
  1694. - CONFIG_SYS_CONSOLE_IS_IN_ENV
  1695. If the board specific function
  1696. extern int overwrite_console (void);
  1697. returns 1, the stdin, stderr and stdout are switched to the
  1698. serial port, else the settings in the environment are used.
  1699. - CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
  1700. Enable the call to overwrite_console().
  1701. - CONFIG_SYS_CONSOLE_ENV_OVERWRITE
  1702. Enable overwrite of previous console environment settings.
  1703. - CONFIG_SYS_MEMTEST_START, CONFIG_SYS_MEMTEST_END:
  1704. Begin and End addresses of the area used by the
  1705. simple memory test.
  1706. - CONFIG_SYS_ALT_MEMTEST:
  1707. Enable an alternate, more extensive memory test.
  1708. - CONFIG_SYS_MEMTEST_SCRATCH:
  1709. Scratch address used by the alternate memory test
  1710. You only need to set this if address zero isn't writeable
  1711. - CONFIG_SYS_MEM_TOP_HIDE (PPC only):
  1712. If CONFIG_SYS_MEM_TOP_HIDE is defined in the board config header,
  1713. this specified memory area will get subtracted from the top
  1714. (end) of RAM and won't get "touched" at all by U-Boot. By
  1715. fixing up gd->ram_size the Linux kernel should gets passed
  1716. the now "corrected" memory size and won't touch it either.
  1717. This should work for arch/ppc and arch/powerpc. Only Linux
  1718. board ports in arch/powerpc with bootwrapper support that
  1719. recalculate the memory size from the SDRAM controller setup
  1720. will have to get fixed in Linux additionally.
  1721. This option can be used as a workaround for the 440EPx/GRx
  1722. CHIP 11 errata where the last 256 bytes in SDRAM shouldn't
  1723. be touched.
  1724. WARNING: Please make sure that this value is a multiple of
  1725. the Linux page size (normally 4k). If this is not the case,
  1726. then the end address of the Linux memory will be located at a
  1727. non page size aligned address and this could cause major
  1728. problems.
  1729. - CONFIG_SYS_TFTP_LOADADDR:
  1730. Default load address for network file downloads
  1731. - CONFIG_SYS_LOADS_BAUD_CHANGE:
  1732. Enable temporary baudrate change while serial download
  1733. - CONFIG_SYS_SDRAM_BASE:
  1734. Physical start address of SDRAM. _Must_ be 0 here.
  1735. - CONFIG_SYS_MBIO_BASE:
  1736. Physical start address of Motherboard I/O (if using a
  1737. Cogent motherboard)
  1738. - CONFIG_SYS_FLASH_BASE:
  1739. Physical start address of Flash memory.
  1740. - CONFIG_SYS_MONITOR_BASE:
  1741. Physical start address of boot monitor code (set by
  1742. make config files to be same as the text base address
  1743. (TEXT_BASE) used when linking) - same as
  1744. CONFIG_SYS_FLASH_BASE when booting from flash.
  1745. - CONFIG_SYS_MONITOR_LEN:
  1746. Size of memory reserved for monitor code, used to
  1747. determine _at_compile_time_ (!) if the environment is
  1748. embedded within the U-Boot image, or in a separate
  1749. flash sector.
  1750. - CONFIG_SYS_MALLOC_LEN:
  1751. Size of DRAM reserved for malloc() use.
  1752. - CONFIG_SYS_BOOTM_LEN:
  1753. Normally compressed uImages are limited to an
  1754. uncompressed size of 8 MBytes. If this is not enough,
  1755. you can define CONFIG_SYS_BOOTM_LEN in your board config file
  1756. to adjust this setting to your needs.
  1757. - CONFIG_SYS_BOOTMAPSZ:
  1758. Maximum size of memory mapped by the startup code of
  1759. the Linux kernel; all data that must be processed by
  1760. the Linux kernel (bd_info, boot arguments, FDT blob if
  1761. used) must be put below this limit, unless "bootm_low"
  1762. enviroment variable is defined and non-zero. In such case
  1763. all data for the Linux kernel must be between "bootm_low"
  1764. and "bootm_low" + CONFIG_SYS_BOOTMAPSZ.
  1765. - CONFIG_SYS_MAX_FLASH_BANKS:
  1766. Max number of Flash memory banks
  1767. - CONFIG_SYS_MAX_FLASH_SECT:
  1768. Max number of sectors on a Flash chip
  1769. - CONFIG_SYS_FLASH_ERASE_TOUT:
  1770. Timeout for Flash erase operations (in ms)
  1771. - CONFIG_SYS_FLASH_WRITE_TOUT:
  1772. Timeout for Flash write operations (in ms)
  1773. - CONFIG_SYS_FLASH_LOCK_TOUT
  1774. Timeout for Flash set sector lock bit operation (in ms)
  1775. - CONFIG_SYS_FLASH_UNLOCK_TOUT
  1776. Timeout for Flash clear lock bits operation (in ms)
  1777. - CONFIG_SYS_FLASH_PROTECTION
  1778. If defined, hardware flash sectors protection is used
  1779. instead of U-Boot software protection.
  1780. - CONFIG_SYS_DIRECT_FLASH_TFTP:
  1781. Enable TFTP transfers directly to flash memory;
  1782. without this option such a download has to be
  1783. performed in two steps: (1) download to RAM, and (2)
  1784. copy from RAM to flash.
  1785. The two-step approach is usually more reliable, since
  1786. you can check if the download worked before you erase
  1787. the flash, but in some situations (when system RAM is
  1788. too limited to allow for a temporary copy of the
  1789. downloaded image) this option may be very useful.
  1790. - CONFIG_SYS_FLASH_CFI:
  1791. Define if the flash driver uses extra elements in the
  1792. common flash structure for storing flash geometry.
  1793. - CONFIG_FLASH_CFI_DRIVER
  1794. This option also enables the building of the cfi_flash driver
  1795. in the drivers directory
  1796. - CONFIG_FLASH_CFI_MTD
  1797. This option enables the building of the cfi_mtd driver
  1798. in the drivers directory. The driver exports CFI flash
  1799. to the MTD layer.
  1800. - CONFIG_SYS_FLASH_USE_BUFFER_WRITE
  1801. Use buffered writes to flash.
  1802. - CONFIG_FLASH_SPANSION_S29WS_N
  1803. s29ws-n MirrorBit flash has non-standard addresses for buffered
  1804. write commands.
  1805. - CONFIG_SYS_FLASH_QUIET_TEST
  1806. If this option is defined, the common CFI flash doesn't
  1807. print it's warning upon not recognized FLASH banks. This
  1808. is useful, if some of the configured banks are only
  1809. optionally available.
  1810. - CONFIG_FLASH_SHOW_PROGRESS
  1811. If defined (must be an integer), print out countdown
  1812. digits and dots. Recommended value: 45 (9..1) for 80
  1813. column displays, 15 (3..1) for 40 column displays.
  1814. - CONFIG_SYS_RX_ETH_BUFFER:
  1815. Defines the number of Ethernet receive buffers. On some
  1816. Ethernet controllers it is recommended to set this value
  1817. to 8 or even higher (EEPRO100 or 405 EMAC), since all
  1818. buffers can be full shortly after enabling the interface
  1819. on high Ethernet traffic.
  1820. Defaults to 4 if not defined.
  1821. The following definitions that deal with the placement and management
  1822. of environment data (variable area); in general, we support the
  1823. following configurations:
  1824. - CONFIG_ENV_IS_IN_FLASH:
  1825. Define this if the environment is in flash memory.
  1826. a) The environment occupies one whole flash sector, which is
  1827. "embedded" in the text segment with the U-Boot code. This
  1828. happens usually with "bottom boot sector" or "top boot
  1829. sector" type flash chips, which have several smaller
  1830. sectors at the start or the end. For instance, such a
  1831. layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In
  1832. such a case you would place the environment in one of the
  1833. 4 kB sectors - with U-Boot code before and after it. With
  1834. "top boot sector" type flash chips, you would put the
  1835. environment in one of the last sectors, leaving a gap
  1836. between U-Boot and the environment.
  1837. - CONFIG_ENV_OFFSET:
  1838. Offset of environment data (variable area) to the
  1839. beginning of flash memory; for instance, with bottom boot
  1840. type flash chips the second sector can be used: the offset
  1841. for this sector is given here.
  1842. CONFIG_ENV_OFFSET is used relative to CONFIG_SYS_FLASH_BASE.
  1843. - CONFIG_ENV_ADDR:
  1844. This is just another way to specify the start address of
  1845. the flash sector containing the environment (instead of
  1846. CONFIG_ENV_OFFSET).
  1847. - CONFIG_ENV_SECT_SIZE:
  1848. Size of the sector containing the environment.
  1849. b) Sometimes flash chips have few, equal sized, BIG sectors.
  1850. In such a case you don't want to spend a whole sector for
  1851. the environment.
  1852. - CONFIG_ENV_SIZE:
  1853. If you use this in combination with CONFIG_ENV_IS_IN_FLASH
  1854. and CONFIG_ENV_SECT_SIZE, you can specify to use only a part
  1855. of this flash sector for the environment. This saves
  1856. memory for the RAM copy of the environment.
  1857. It may also save flash memory if you decide to use this
  1858. when your environment is "embedded" within U-Boot code,
  1859. since then the remainder of the flash sector could be used
  1860. for U-Boot code. It should be pointed out that this is
  1861. STRONGLY DISCOURAGED from a robustness point of view:
  1862. updating the environment in flash makes it always
  1863. necessary to erase the WHOLE sector. If something goes
  1864. wrong before the contents has been restored from a copy in
  1865. RAM, your target system will be dead.
  1866. - CONFIG_ENV_ADDR_REDUND
  1867. CONFIG_ENV_SIZE_REDUND
  1868. These settings describe a second storage area used to hold
  1869. a redundant copy of the environment data, so that there is
  1870. a valid backup copy in case there is a power failure during
  1871. a "saveenv" operation.
  1872. BE CAREFUL! Any changes to the flash layout, and some changes to the
  1873. source code will make it necessary to adapt <board>/u-boot.lds*
  1874. accordingly!
  1875. - CONFIG_ENV_IS_IN_NVRAM:
  1876. Define this if you have some non-volatile memory device
  1877. (NVRAM, battery buffered SRAM) which you want to use for the
  1878. environment.
  1879. - CONFIG_ENV_ADDR:
  1880. - CONFIG_ENV_SIZE:
  1881. These two #defines are used to determine the memory area you
  1882. want to use for environment. It is assumed that this memory
  1883. can just be read and written to, without any special
  1884. provision.
  1885. BE CAREFUL! The first access to the environment happens quite early
  1886. in U-Boot initalization (when we try to get the setting of for the
  1887. console baudrate). You *MUST* have mapped your NVRAM area then, or
  1888. U-Boot will hang.
  1889. Please note that even with NVRAM we still use a copy of the
  1890. environment in RAM: we could work on NVRAM directly, but we want to
  1891. keep settings there always unmodified except somebody uses "saveenv"
  1892. to save the current settings.
  1893. - CONFIG_ENV_IS_IN_EEPROM:
  1894. Use this if you have an EEPROM or similar serial access
  1895. device and a driver for it.
  1896. - CONFIG_ENV_OFFSET:
  1897. - CONFIG_ENV_SIZE:
  1898. These two #defines specify the offset and size of the
  1899. environment area within the total memory of your EEPROM.
  1900. - CONFIG_SYS_I2C_EEPROM_ADDR:
  1901. If defined, specified the chip address of the EEPROM device.
  1902. The default address is zero.
  1903. - CONFIG_SYS_EEPROM_PAGE_WRITE_BITS:
  1904. If defined, the number of bits used to address bytes in a
  1905. single page in the EEPROM device. A 64 byte page, for example
  1906. would require six bits.
  1907. - CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS:
  1908. If defined, the number of milliseconds to delay between
  1909. page writes. The default is zero milliseconds.
  1910. - CONFIG_SYS_I2C_EEPROM_ADDR_LEN:
  1911. The length in bytes of the EEPROM memory array address. Note
  1912. that this is NOT the chip address length!
  1913. - CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW:
  1914. EEPROM chips that implement "address overflow" are ones
  1915. like Catalyst 24WC04/08/16 which has 9/10/11 bits of
  1916. address and the extra bits end up in the "chip address" bit
  1917. slots. This makes a 24WC08 (1Kbyte) chip look like four 256
  1918. byte chips.
  1919. Note that we consider the length of the address field to
  1920. still be one byte because the extra address bits are hidden
  1921. in the chip address.
  1922. - CONFIG_SYS_EEPROM_SIZE:
  1923. The size in bytes of the EEPROM device.
  1924. - CONFIG_ENV_EEPROM_IS_ON_I2C
  1925. define this, if you have I2C and SPI activated, and your
  1926. EEPROM, which holds the environment, is on the I2C bus.
  1927. - CONFIG_I2C_ENV_EEPROM_BUS
  1928. if you have an Environment on an EEPROM reached over
  1929. I2C muxes, you can define here, how to reach this
  1930. EEPROM. For example:
  1931. #define CONFIG_I2C_ENV_EEPROM_BUS "pca9547:70:d\0"
  1932. EEPROM which holds the environment, is reached over
  1933. a pca9547 i2c mux with address 0x70, channel 3.
  1934. - CONFIG_ENV_IS_IN_DATAFLASH:
  1935. Define this if you have a DataFlash memory device which you
  1936. want to use for the environment.
  1937. - CONFIG_ENV_OFFSET:
  1938. - CONFIG_ENV_ADDR:
  1939. - CONFIG_ENV_SIZE:
  1940. These three #defines specify the offset and size of the
  1941. environment area within the total memory of your DataFlash placed
  1942. at the specified address.
  1943. - CONFIG_ENV_IS_IN_NAND:
  1944. Define this if you have a NAND device which you want to use
  1945. for the environment.
  1946. - CONFIG_ENV_OFFSET:
  1947. - CONFIG_ENV_SIZE:
  1948. These two #defines specify the offset and size of the environment
  1949. area within the first NAND device.
  1950. - CONFIG_ENV_OFFSET_REDUND
  1951. This setting describes a second storage area of CONFIG_ENV_SIZE
  1952. size used to hold a redundant copy of the environment data,
  1953. so that there is a valid backup copy in case there is a
  1954. power failure during a "saveenv" operation.
  1955. Note: CONFIG_ENV_OFFSET and CONFIG_ENV_OFFSET_REDUND must be aligned
  1956. to a block boundary, and CONFIG_ENV_SIZE must be a multiple of
  1957. the NAND devices block size.
  1958. - CONFIG_NAND_ENV_DST
  1959. Defines address in RAM to which the nand_spl code should copy the
  1960. environment. If redundant environment is used, it will be copied to
  1961. CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE.
  1962. - CONFIG_SYS_SPI_INIT_OFFSET
  1963. Defines offset to the initial SPI buffer area in DPRAM. The
  1964. area is used at an early stage (ROM part) if the environment
  1965. is configured to reside in the SPI EEPROM: We need a 520 byte
  1966. scratch DPRAM area. It is used between the two initialization
  1967. calls (spi_init_f() and spi_init_r()). A value of 0xB00 seems
  1968. to be a good choice since it makes it far enough from the
  1969. start of the data area as well as from the stack pointer.
  1970. Please note that the environment is read-only until the monitor
  1971. has been relocated to RAM and a RAM copy of the environment has been
  1972. created; also, when using EEPROM you will have to use getenv_f()
  1973. until then to read environment variables.
  1974. The environment is protected by a CRC32 checksum. Before the monitor
  1975. is relocated into RAM, as a result of a bad CRC you will be working
  1976. with the compiled-in default environment - *silently*!!! [This is
  1977. necessary, because the first environment variable we need is the
  1978. "baudrate" setting for the console - if we have a bad CRC, we don't
  1979. have any device yet where we could complain.]
  1980. Note: once the monitor has been relocated, then it will complain if
  1981. the default environment is used; a new CRC is computed as soon as you
  1982. use the "saveenv" command to store a valid environment.
  1983. - CONFIG_SYS_FAULT_ECHO_LINK_DOWN:
  1984. Echo the inverted Ethernet link state to the fault LED.
  1985. Note: If this option is active, then CONFIG_SYS_FAULT_MII_ADDR
  1986. also needs to be defined.
  1987. - CONFIG_SYS_FAULT_MII_ADDR:
  1988. MII address of the PHY to check for the Ethernet link state.
  1989. - CONFIG_NS16550_MIN_FUNCTIONS:
  1990. Define this if you desire to only have use of the NS16550_init
  1991. and NS16550_putc functions for the serial driver located at
  1992. drivers/serial/ns16550.c. This option is useful for saving
  1993. space for already greatly restricted images, including but not
  1994. limited to NAND_SPL configurations.
  1995. Low Level (hardware related) configuration options:
  1996. ---------------------------------------------------
  1997. - CONFIG_SYS_CACHELINE_SIZE:
  1998. Cache Line Size of the CPU.
  1999. - CONFIG_SYS_DEFAULT_IMMR:
  2000. Default address of the IMMR after system reset.
  2001. Needed on some 8260 systems (MPC8260ADS, PQ2FADS-ZU,
  2002. and RPXsuper) to be able to adjust the position of
  2003. the IMMR register after a reset.
  2004. - Floppy Disk Support:
  2005. CONFIG_SYS_FDC_DRIVE_NUMBER
  2006. the default drive number (default value 0)
  2007. CONFIG_SYS_ISA_IO_STRIDE
  2008. defines the spacing between FDC chipset registers
  2009. (default value 1)
  2010. CONFIG_SYS_ISA_IO_OFFSET
  2011. defines the offset of register from address. It
  2012. depends on which part of the data bus is connected to
  2013. the FDC chipset. (default value 0)
  2014. If CONFIG_SYS_ISA_IO_STRIDE CONFIG_SYS_ISA_IO_OFFSET and
  2015. CONFIG_SYS_FDC_DRIVE_NUMBER are undefined, they take their
  2016. default value.
  2017. if CONFIG_SYS_FDC_HW_INIT is defined, then the function
  2018. fdc_hw_init() is called at the beginning of the FDC
  2019. setup. fdc_hw_init() must be provided by the board
  2020. source code. It is used to make hardware dependant
  2021. initializations.
  2022. - CONFIG_SYS_IMMR: Physical address of the Internal Memory.
  2023. DO NOT CHANGE unless you know exactly what you're
  2024. doing! (11-4) [MPC8xx/82xx systems only]
  2025. - CONFIG_SYS_INIT_RAM_ADDR:
  2026. Start address of memory area that can be used for
  2027. initial data and stack; please note that this must be
  2028. writable memory that is working WITHOUT special
  2029. initialization, i. e. you CANNOT use normal RAM which
  2030. will become available only after programming the
  2031. memory controller and running certain initialization
  2032. sequences.
  2033. U-Boot uses the following memory types:
  2034. - MPC8xx and MPC8260: IMMR (internal memory of the CPU)
  2035. - MPC824X: data cache
  2036. - PPC4xx: data cache
  2037. - CONFIG_SYS_GBL_DATA_OFFSET:
  2038. Offset of the initial data structure in the memory
  2039. area defined by CONFIG_SYS_INIT_RAM_ADDR. Usually
  2040. CONFIG_SYS_GBL_DATA_OFFSET is chosen such that the initial
  2041. data is located at the end of the available space
  2042. (sometimes written as (CONFIG_SYS_INIT_RAM_END -
  2043. CONFIG_SYS_INIT_DATA_SIZE), and the initial stack is just
  2044. below that area (growing from (CONFIG_SYS_INIT_RAM_ADDR +
  2045. CONFIG_SYS_GBL_DATA_OFFSET) downward.
  2046. Note:
  2047. On the MPC824X (or other systems that use the data
  2048. cache for initial memory) the address chosen for
  2049. CONFIG_SYS_INIT_RAM_ADDR is basically arbitrary - it must
  2050. point to an otherwise UNUSED address space between
  2051. the top of RAM and the start of the PCI space.
  2052. - CONFIG_SYS_SIUMCR: SIU Module Configuration (11-6)
  2053. - CONFIG_SYS_SYPCR: System Protection Control (11-9)
  2054. - CONFIG_SYS_TBSCR: Time Base Status and Control (11-26)
  2055. - CONFIG_SYS_PISCR: Periodic Interrupt Status and Control (11-31)
  2056. - CONFIG_SYS_PLPRCR: PLL, Low-Power, and Reset Control Register (15-30)
  2057. - CONFIG_SYS_SCCR: System Clock and reset Control Register (15-27)
  2058. - CONFIG_SYS_OR_TIMING_SDRAM:
  2059. SDRAM timing
  2060. - CONFIG_SYS_MAMR_PTA:
  2061. periodic timer for refresh
  2062. - CONFIG_SYS_DER: Debug Event Register (37-47)
  2063. - FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CONFIG_SYS_REMAP_OR_AM,
  2064. CONFIG_SYS_PRELIM_OR_AM, CONFIG_SYS_OR_TIMING_FLASH, CONFIG_SYS_OR0_REMAP,
  2065. CONFIG_SYS_OR0_PRELIM, CONFIG_SYS_BR0_PRELIM, CONFIG_SYS_OR1_REMAP, CONFIG_SYS_OR1_PRELIM,
  2066. CONFIG_SYS_BR1_PRELIM:
  2067. Memory Controller Definitions: BR0/1 and OR0/1 (FLASH)
  2068. - SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE,
  2069. CONFIG_SYS_OR_TIMING_SDRAM, CONFIG_SYS_OR2_PRELIM, CONFIG_SYS_BR2_PRELIM,
  2070. CONFIG_SYS_OR3_PRELIM, CONFIG_SYS_BR3_PRELIM:
  2071. Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM)
  2072. - CONFIG_SYS_MAMR_PTA, CONFIG_SYS_MPTPR_2BK_4K, CONFIG_SYS_MPTPR_1BK_4K, CONFIG_SYS_MPTPR_2BK_8K,
  2073. CONFIG_SYS_MPTPR_1BK_8K, CONFIG_SYS_MAMR_8COL, CONFIG_SYS_MAMR_9COL:
  2074. Machine Mode Register and Memory Periodic Timer
  2075. Prescaler definitions (SDRAM timing)
  2076. - CONFIG_SYS_I2C_UCODE_PATCH, CONFIG_SYS_I2C_DPMEM_OFFSET [0x1FC0]:
  2077. enable I2C microcode relocation patch (MPC8xx);
  2078. define relocation offset in DPRAM [DSP2]
  2079. - CONFIG_SYS_SMC_UCODE_PATCH, CONFIG_SYS_SMC_DPMEM_OFFSET [0x1FC0]:
  2080. enable SMC microcode relocation patch (MPC8xx);
  2081. define relocation offset in DPRAM [SMC1]
  2082. - CONFIG_SYS_SPI_UCODE_PATCH, CONFIG_SYS_SPI_DPMEM_OFFSET [0x1FC0]:
  2083. enable SPI microcode relocation patch (MPC8xx);
  2084. define relocation offset in DPRAM [SCC4]
  2085. - CONFIG_SYS_USE_OSCCLK:
  2086. Use OSCM clock mode on MBX8xx board. Be careful,
  2087. wrong setting might damage your board. Read
  2088. doc/README.MBX before setting this variable!
  2089. - CONFIG_SYS_CPM_POST_WORD_ADDR: (MPC8xx, MPC8260 only)
  2090. Offset of the bootmode word in DPRAM used by post
  2091. (Power On Self Tests). This definition overrides
  2092. #define'd default value in commproc.h resp.
  2093. cpm_8260.h.
  2094. - CONFIG_SYS_PCI_SLV_MEM_LOCAL, CONFIG_SYS_PCI_SLV_MEM_BUS, CONFIG_SYS_PICMR0_MASK_ATTRIB,
  2095. CONFIG_SYS_PCI_MSTR0_LOCAL, CONFIG_SYS_PCIMSK0_MASK, CONFIG_SYS_PCI_MSTR1_LOCAL,
  2096. CONFIG_SYS_PCIMSK1_MASK, CONFIG_SYS_PCI_MSTR_MEM_LOCAL, CONFIG_SYS_PCI_MSTR_MEM_BUS,
  2097. CONFIG_SYS_CPU_PCI_MEM_START, CONFIG_SYS_PCI_MSTR_MEM_SIZE, CONFIG_SYS_POCMR0_MASK_ATTRIB,
  2098. CONFIG_SYS_PCI_MSTR_MEMIO_LOCAL, CONFIG_SYS_PCI_MSTR_MEMIO_BUS, CPU_PCI_MEMIO_START,
  2099. CONFIG_SYS_PCI_MSTR_MEMIO_SIZE, CONFIG_SYS_POCMR1_MASK_ATTRIB, CONFIG_SYS_PCI_MSTR_IO_LOCAL,
  2100. CONFIG_SYS_PCI_MSTR_IO_BUS, CONFIG_SYS_CPU_PCI_IO_START, CONFIG_SYS_PCI_MSTR_IO_SIZE,
  2101. CONFIG_SYS_POCMR2_MASK_ATTRIB: (MPC826x only)
  2102. Overrides the default PCI memory map in arch/powerpc/cpu/mpc8260/pci.c if set.
  2103. - CONFIG_PCI_DISABLE_PCIE:
  2104. Disable PCI-Express on systems where it is supported but not
  2105. required.
  2106. - CONFIG_SPD_EEPROM
  2107. Get DDR timing information from an I2C EEPROM. Common
  2108. with pluggable memory modules such as SODIMMs
  2109. SPD_EEPROM_ADDRESS
  2110. I2C address of the SPD EEPROM
  2111. - CONFIG_SYS_SPD_BUS_NUM
  2112. If SPD EEPROM is on an I2C bus other than the first
  2113. one, specify here. Note that the value must resolve
  2114. to something your driver can deal with.
  2115. - CONFIG_SYS_83XX_DDR_USES_CS0
  2116. Only for 83xx systems. If specified, then DDR should
  2117. be configured using CS0 and CS1 instead of CS2 and CS3.
  2118. - CONFIG_ETHER_ON_FEC[12]
  2119. Define to enable FEC[12] on a 8xx series processor.
  2120. - CONFIG_FEC[12]_PHY
  2121. Define to the hardcoded PHY address which corresponds
  2122. to the given FEC; i. e.
  2123. #define CONFIG_FEC1_PHY 4
  2124. means that the PHY with address 4 is connected to FEC1
  2125. When set to -1, means to probe for first available.
  2126. - CONFIG_FEC[12]_PHY_NORXERR
  2127. The PHY does not have a RXERR line (RMII only).
  2128. (so program the FEC to ignore it).
  2129. - CONFIG_RMII
  2130. Enable RMII mode for all FECs.
  2131. Note that this is a global option, we can't
  2132. have one FEC in standard MII mode and another in RMII mode.
  2133. - CONFIG_CRC32_VERIFY
  2134. Add a verify option to the crc32 command.
  2135. The syntax is:
  2136. => crc32 -v <address> <count> <crc32>
  2137. Where address/count indicate a memory area
  2138. and crc32 is the correct crc32 which the
  2139. area should have.
  2140. - CONFIG_LOOPW
  2141. Add the "loopw" memory command. This only takes effect if
  2142. the memory commands are activated globally (CONFIG_CMD_MEM).
  2143. - CONFIG_MX_CYCLIC
  2144. Add the "mdc" and "mwc" memory commands. These are cyclic
  2145. "md/mw" commands.
  2146. Examples:
  2147. => mdc.b 10 4 500
  2148. This command will print 4 bytes (10,11,12,13) each 500 ms.
  2149. => mwc.l 100 12345678 10
  2150. This command will write 12345678 to address 100 all 10 ms.
  2151. This only takes effect if the memory commands are activated
  2152. globally (CONFIG_CMD_MEM).
  2153. - CONFIG_SKIP_LOWLEVEL_INIT
  2154. - CONFIG_SKIP_RELOCATE_UBOOT
  2155. [ARM only] If these variables are defined, then
  2156. certain low level initializations (like setting up
  2157. the memory controller) are omitted and/or U-Boot does
  2158. not relocate itself into RAM.
  2159. Normally these variables MUST NOT be defined. The
  2160. only exception is when U-Boot is loaded (to RAM) by
  2161. some other boot loader or by a debugger which
  2162. performs these initializations itself.
  2163. - CONFIG_PRELOADER
  2164. Modifies the behaviour of start.S when compiling a loader
  2165. that is executed before the actual U-Boot. E.g. when
  2166. compiling a NAND SPL.
  2167. Building the Software:
  2168. ======================
  2169. Building U-Boot has been tested in several native build environments
  2170. and in many different cross environments. Of course we cannot support
  2171. all possibly existing versions of cross development tools in all
  2172. (potentially obsolete) versions. In case of tool chain problems we
  2173. recommend to use the ELDK (see http://www.denx.de/wiki/DULG/ELDK)
  2174. which is extensively used to build and test U-Boot.
  2175. If you are not using a native environment, it is assumed that you
  2176. have GNU cross compiling tools available in your path. In this case,
  2177. you must set the environment variable CROSS_COMPILE in your shell.
  2178. Note that no changes to the Makefile or any other source files are
  2179. necessary. For example using the ELDK on a 4xx CPU, please enter:
  2180. $ CROSS_COMPILE=ppc_4xx-
  2181. $ export CROSS_COMPILE
  2182. Note: If you wish to generate Windows versions of the utilities in
  2183. the tools directory you can use the MinGW toolchain
  2184. (http://www.mingw.org). Set your HOST tools to the MinGW
  2185. toolchain and execute 'make tools'. For example:
  2186. $ make HOSTCC=i586-mingw32msvc-gcc HOSTSTRIP=i586-mingw32msvc-strip tools
  2187. Binaries such as tools/mkimage.exe will be created which can
  2188. be executed on computers running Windows.
  2189. U-Boot is intended to be simple to build. After installing the
  2190. sources you must configure U-Boot for one specific board type. This
  2191. is done by typing:
  2192. make NAME_config
  2193. where "NAME_config" is the name of one of the existing configu-
  2194. rations; see the main Makefile for supported names.
  2195. Note: for some board special configuration names may exist; check if
  2196. additional information is available from the board vendor; for
  2197. instance, the TQM823L systems are available without (standard)
  2198. or with LCD support. You can select such additional "features"
  2199. when choosing the configuration, i. e.
  2200. make TQM823L_config
  2201. - will configure for a plain TQM823L, i. e. no LCD support
  2202. make TQM823L_LCD_config
  2203. - will configure for a TQM823L with U-Boot console on LCD
  2204. etc.
  2205. Finally, type "make all", and you should get some working U-Boot
  2206. images ready for download to / installation on your system:
  2207. - "u-boot.bin" is a raw binary image
  2208. - "u-boot" is an image in ELF binary format
  2209. - "u-boot.srec" is in Motorola S-Record format
  2210. By default the build is performed locally and the objects are saved
  2211. in the source directory. One of the two methods can be used to change
  2212. this behavior and build U-Boot to some external directory:
  2213. 1. Add O= to the make command line invocations:
  2214. make O=/tmp/build distclean
  2215. make O=/tmp/build NAME_config
  2216. make O=/tmp/build all
  2217. 2. Set environment variable BUILD_DIR to point to the desired location:
  2218. export BUILD_DIR=/tmp/build
  2219. make distclean
  2220. make NAME_config
  2221. make all
  2222. Note that the command line "O=" setting overrides the BUILD_DIR environment
  2223. variable.
  2224. Please be aware that the Makefiles assume you are using GNU make, so
  2225. for instance on NetBSD you might need to use "gmake" instead of
  2226. native "make".
  2227. If the system board that you have is not listed, then you will need
  2228. to port U-Boot to your hardware platform. To do this, follow these
  2229. steps:
  2230. 1. Add a new configuration option for your board to the toplevel
  2231. "Makefile" and to the "MAKEALL" script, using the existing
  2232. entries as examples. Note that here and at many other places
  2233. boards and other names are listed in alphabetical sort order. Please
  2234. keep this order.
  2235. 2. Create a new directory to hold your board specific code. Add any
  2236. files you need. In your board directory, you will need at least
  2237. the "Makefile", a "<board>.c", "flash.c" and "u-boot.lds".
  2238. 3. Create a new configuration file "include/configs/<board>.h" for
  2239. your board
  2240. 3. If you're porting U-Boot to a new CPU, then also create a new
  2241. directory to hold your CPU specific code. Add any files you need.
  2242. 4. Run "make <board>_config" with your new name.
  2243. 5. Type "make", and you should get a working "u-boot.srec" file
  2244. to be installed on your target system.
  2245. 6. Debug and solve any problems that might arise.
  2246. [Of course, this last step is much harder than it sounds.]
  2247. Testing of U-Boot Modifications, Ports to New Hardware, etc.:
  2248. ==============================================================
  2249. If you have modified U-Boot sources (for instance added a new board
  2250. or support for new devices, a new CPU, etc.) you are expected to
  2251. provide feedback to the other developers. The feedback normally takes
  2252. the form of a "patch", i. e. a context diff against a certain (latest
  2253. official or latest in the git repository) version of U-Boot sources.
  2254. But before you submit such a patch, please verify that your modifi-
  2255. cation did not break existing code. At least make sure that *ALL* of
  2256. the supported boards compile WITHOUT ANY compiler warnings. To do so,
  2257. just run the "MAKEALL" script, which will configure and build U-Boot
  2258. for ALL supported system. Be warned, this will take a while. You can
  2259. select which (cross) compiler to use by passing a `CROSS_COMPILE'
  2260. environment variable to the script, i. e. to use the ELDK cross tools
  2261. you can type
  2262. CROSS_COMPILE=ppc_8xx- MAKEALL
  2263. or to build on a native PowerPC system you can type
  2264. CROSS_COMPILE=' ' MAKEALL
  2265. When using the MAKEALL script, the default behaviour is to build
  2266. U-Boot in the source directory. This location can be changed by
  2267. setting the BUILD_DIR environment variable. Also, for each target
  2268. built, the MAKEALL script saves two log files (<target>.ERR and
  2269. <target>.MAKEALL) in the <source dir>/LOG directory. This default
  2270. location can be changed by setting the MAKEALL_LOGDIR environment
  2271. variable. For example:
  2272. export BUILD_DIR=/tmp/build
  2273. export MAKEALL_LOGDIR=/tmp/log
  2274. CROSS_COMPILE=ppc_8xx- MAKEALL
  2275. With the above settings build objects are saved in the /tmp/build,
  2276. log files are saved in the /tmp/log and the source tree remains clean
  2277. during the whole build process.
  2278. See also "U-Boot Porting Guide" below.
  2279. Monitor Commands - Overview:
  2280. ============================
  2281. go - start application at address 'addr'
  2282. run - run commands in an environment variable
  2283. bootm - boot application image from memory
  2284. bootp - boot image via network using BootP/TFTP protocol
  2285. tftpboot- boot image via network using TFTP protocol
  2286. and env variables "ipaddr" and "serverip"
  2287. (and eventually "gatewayip")
  2288. rarpboot- boot image via network using RARP/TFTP protocol
  2289. diskboot- boot from IDE devicebootd - boot default, i.e., run 'bootcmd'
  2290. loads - load S-Record file over serial line
  2291. loadb - load binary file over serial line (kermit mode)
  2292. md - memory display
  2293. mm - memory modify (auto-incrementing)
  2294. nm - memory modify (constant address)
  2295. mw - memory write (fill)
  2296. cp - memory copy
  2297. cmp - memory compare
  2298. crc32 - checksum calculation
  2299. i2c - I2C sub-system
  2300. sspi - SPI utility commands
  2301. base - print or set address offset
  2302. printenv- print environment variables
  2303. setenv - set environment variables
  2304. saveenv - save environment variables to persistent storage
  2305. protect - enable or disable FLASH write protection
  2306. erase - erase FLASH memory
  2307. flinfo - print FLASH memory information
  2308. bdinfo - print Board Info structure
  2309. iminfo - print header information for application image
  2310. coninfo - print console devices and informations
  2311. ide - IDE sub-system
  2312. loop - infinite loop on address range
  2313. loopw - infinite write loop on address range
  2314. mtest - simple RAM test
  2315. icache - enable or disable instruction cache
  2316. dcache - enable or disable data cache
  2317. reset - Perform RESET of the CPU
  2318. echo - echo args to console
  2319. version - print monitor version
  2320. help - print online help
  2321. ? - alias for 'help'
  2322. Monitor Commands - Detailed Description:
  2323. ========================================
  2324. TODO.
  2325. For now: just type "help <command>".
  2326. Environment Variables:
  2327. ======================
  2328. U-Boot supports user configuration using Environment Variables which
  2329. can be made persistent by saving to Flash memory.
  2330. Environment Variables are set using "setenv", printed using
  2331. "printenv", and saved to Flash using "saveenv". Using "setenv"
  2332. without a value can be used to delete a variable from the
  2333. environment. As long as you don't save the environment you are
  2334. working with an in-memory copy. In case the Flash area containing the
  2335. environment is erased by accident, a default environment is provided.
  2336. Some configuration options can be set using Environment Variables.
  2337. List of environment variables (most likely not complete):
  2338. baudrate - see CONFIG_BAUDRATE
  2339. bootdelay - see CONFIG_BOOTDELAY
  2340. bootcmd - see CONFIG_BOOTCOMMAND
  2341. bootargs - Boot arguments when booting an RTOS image
  2342. bootfile - Name of the image to load with TFTP
  2343. bootm_low - Memory range available for image processing in the bootm
  2344. command can be restricted. This variable is given as
  2345. a hexadecimal number and defines lowest address allowed
  2346. for use by the bootm command. See also "bootm_size"
  2347. environment variable. Address defined by "bootm_low" is
  2348. also the base of the initial memory mapping for the Linux
  2349. kernel -- see the description of CONFIG_SYS_BOOTMAPSZ.
  2350. bootm_size - Memory range available for image processing in the bootm
  2351. command can be restricted. This variable is given as
  2352. a hexadecimal number and defines the size of the region
  2353. allowed for use by the bootm command. See also "bootm_low"
  2354. environment variable.
  2355. updatefile - Location of the software update file on a TFTP server, used
  2356. by the automatic software update feature. Please refer to
  2357. documentation in doc/README.update for more details.
  2358. autoload - if set to "no" (any string beginning with 'n'),
  2359. "bootp" will just load perform a lookup of the
  2360. configuration from the BOOTP server, but not try to
  2361. load any image using TFTP
  2362. autostart - if set to "yes", an image loaded using the "bootp",
  2363. "rarpboot", "tftpboot" or "diskboot" commands will
  2364. be automatically started (by internally calling
  2365. "bootm")
  2366. If set to "no", a standalone image passed to the
  2367. "bootm" command will be copied to the load address
  2368. (and eventually uncompressed), but NOT be started.
  2369. This can be used to load and uncompress arbitrary
  2370. data.
  2371. i2cfast - (PPC405GP|PPC405EP only)
  2372. if set to 'y' configures Linux I2C driver for fast
  2373. mode (400kHZ). This environment variable is used in
  2374. initialization code. So, for changes to be effective
  2375. it must be saved and board must be reset.
  2376. initrd_high - restrict positioning of initrd images:
  2377. If this variable is not set, initrd images will be
  2378. copied to the highest possible address in RAM; this
  2379. is usually what you want since it allows for
  2380. maximum initrd size. If for some reason you want to
  2381. make sure that the initrd image is loaded below the
  2382. CONFIG_SYS_BOOTMAPSZ limit, you can set this environment
  2383. variable to a value of "no" or "off" or "0".
  2384. Alternatively, you can set it to a maximum upper
  2385. address to use (U-Boot will still check that it
  2386. does not overwrite the U-Boot stack and data).
  2387. For instance, when you have a system with 16 MB
  2388. RAM, and want to reserve 4 MB from use by Linux,
  2389. you can do this by adding "mem=12M" to the value of
  2390. the "bootargs" variable. However, now you must make
  2391. sure that the initrd image is placed in the first
  2392. 12 MB as well - this can be done with
  2393. setenv initrd_high 00c00000
  2394. If you set initrd_high to 0xFFFFFFFF, this is an
  2395. indication to U-Boot that all addresses are legal
  2396. for the Linux kernel, including addresses in flash
  2397. memory. In this case U-Boot will NOT COPY the
  2398. ramdisk at all. This may be useful to reduce the
  2399. boot time on your system, but requires that this
  2400. feature is supported by your Linux kernel.
  2401. ipaddr - IP address; needed for tftpboot command
  2402. loadaddr - Default load address for commands like "bootp",
  2403. "rarpboot", "tftpboot", "loadb" or "diskboot"
  2404. loads_echo - see CONFIG_LOADS_ECHO
  2405. serverip - TFTP server IP address; needed for tftpboot command
  2406. bootretry - see CONFIG_BOOT_RETRY_TIME
  2407. bootdelaykey - see CONFIG_AUTOBOOT_DELAY_STR
  2408. bootstopkey - see CONFIG_AUTOBOOT_STOP_STR
  2409. ethprime - When CONFIG_NET_MULTI is enabled controls which
  2410. interface is used first.
  2411. ethact - When CONFIG_NET_MULTI is enabled controls which
  2412. interface is currently active. For example you
  2413. can do the following
  2414. => setenv ethact FEC
  2415. => ping 192.168.0.1 # traffic sent on FEC
  2416. => setenv ethact SCC
  2417. => ping 10.0.0.1 # traffic sent on SCC
  2418. ethrotate - When set to "no" U-Boot does not go through all
  2419. available network interfaces.
  2420. It just stays at the currently selected interface.
  2421. netretry - When set to "no" each network operation will
  2422. either succeed or fail without retrying.
  2423. When set to "once" the network operation will
  2424. fail when all the available network interfaces
  2425. are tried once without success.
  2426. Useful on scripts which control the retry operation
  2427. themselves.
  2428. npe_ucode - set load address for the NPE microcode
  2429. tftpsrcport - If this is set, the value is used for TFTP's
  2430. UDP source port.
  2431. tftpdstport - If this is set, the value is used for TFTP's UDP
  2432. destination port instead of the Well Know Port 69.
  2433. tftpblocksize - Block size to use for TFTP transfers; if not set,
  2434. we use the TFTP server's default block size
  2435. tftptimeout - Retransmission timeout for TFTP packets (in milli-
  2436. seconds, minimum value is 1000 = 1 second). Defines
  2437. when a packet is considered to be lost so it has to
  2438. be retransmitted. The default is 5000 = 5 seconds.
  2439. Lowering this value may make downloads succeed
  2440. faster in networks with high packet loss rates or
  2441. with unreliable TFTP servers.
  2442. vlan - When set to a value < 4095 the traffic over
  2443. Ethernet is encapsulated/received over 802.1q
  2444. VLAN tagged frames.
  2445. The following environment variables may be used and automatically
  2446. updated by the network boot commands ("bootp" and "rarpboot"),
  2447. depending the information provided by your boot server:
  2448. bootfile - see above
  2449. dnsip - IP address of your Domain Name Server
  2450. dnsip2 - IP address of your secondary Domain Name Server
  2451. gatewayip - IP address of the Gateway (Router) to use
  2452. hostname - Target hostname
  2453. ipaddr - see above
  2454. netmask - Subnet Mask
  2455. rootpath - Pathname of the root filesystem on the NFS server
  2456. serverip - see above
  2457. There are two special Environment Variables:
  2458. serial# - contains hardware identification information such
  2459. as type string and/or serial number
  2460. ethaddr - Ethernet address
  2461. These variables can be set only once (usually during manufacturing of
  2462. the board). U-Boot refuses to delete or overwrite these variables
  2463. once they have been set once.
  2464. Further special Environment Variables:
  2465. ver - Contains the U-Boot version string as printed
  2466. with the "version" command. This variable is
  2467. readonly (see CONFIG_VERSION_VARIABLE).
  2468. Please note that changes to some configuration parameters may take
  2469. only effect after the next boot (yes, that's just like Windoze :-).
  2470. Command Line Parsing:
  2471. =====================
  2472. There are two different command line parsers available with U-Boot:
  2473. the old "simple" one, and the much more powerful "hush" shell:
  2474. Old, simple command line parser:
  2475. --------------------------------
  2476. - supports environment variables (through setenv / saveenv commands)
  2477. - several commands on one line, separated by ';'
  2478. - variable substitution using "... ${name} ..." syntax
  2479. - special characters ('$', ';') can be escaped by prefixing with '\',
  2480. for example:
  2481. setenv bootcmd bootm \${address}
  2482. - You can also escape text by enclosing in single apostrophes, for example:
  2483. setenv addip 'setenv bootargs $bootargs ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname::off'
  2484. Hush shell:
  2485. -----------
  2486. - similar to Bourne shell, with control structures like
  2487. if...then...else...fi, for...do...done; while...do...done,
  2488. until...do...done, ...
  2489. - supports environment ("global") variables (through setenv / saveenv
  2490. commands) and local shell variables (through standard shell syntax
  2491. "name=value"); only environment variables can be used with "run"
  2492. command
  2493. General rules:
  2494. --------------
  2495. (1) If a command line (or an environment variable executed by a "run"
  2496. command) contains several commands separated by semicolon, and
  2497. one of these commands fails, then the remaining commands will be
  2498. executed anyway.
  2499. (2) If you execute several variables with one call to run (i. e.
  2500. calling run with a list of variables as arguments), any failing
  2501. command will cause "run" to terminate, i. e. the remaining
  2502. variables are not executed.
  2503. Note for Redundant Ethernet Interfaces:
  2504. =======================================
  2505. Some boards come with redundant Ethernet interfaces; U-Boot supports
  2506. such configurations and is capable of automatic selection of a
  2507. "working" interface when needed. MAC assignment works as follows:
  2508. Network interfaces are numbered eth0, eth1, eth2, ... Corresponding
  2509. MAC addresses can be stored in the environment as "ethaddr" (=>eth0),
  2510. "eth1addr" (=>eth1), "eth2addr", ...
  2511. If the network interface stores some valid MAC address (for instance
  2512. in SROM), this is used as default address if there is NO correspon-
  2513. ding setting in the environment; if the corresponding environment
  2514. variable is set, this overrides the settings in the card; that means:
  2515. o If the SROM has a valid MAC address, and there is no address in the
  2516. environment, the SROM's address is used.
  2517. o If there is no valid address in the SROM, and a definition in the
  2518. environment exists, then the value from the environment variable is
  2519. used.
  2520. o If both the SROM and the environment contain a MAC address, and
  2521. both addresses are the same, this MAC address is used.
  2522. o If both the SROM and the environment contain a MAC address, and the
  2523. addresses differ, the value from the environment is used and a
  2524. warning is printed.
  2525. o If neither SROM nor the environment contain a MAC address, an error
  2526. is raised.
  2527. If Ethernet drivers implement the 'write_hwaddr' function, valid MAC addresses
  2528. will be programmed into hardware as part of the initialization process. This
  2529. may be skipped by setting the appropriate 'ethmacskip' environment variable.
  2530. The naming convention is as follows:
  2531. "ethmacskip" (=>eth0), "eth1macskip" (=>eth1) etc.
  2532. Image Formats:
  2533. ==============
  2534. U-Boot is capable of booting (and performing other auxiliary operations on)
  2535. images in two formats:
  2536. New uImage format (FIT)
  2537. -----------------------
  2538. Flexible and powerful format based on Flattened Image Tree -- FIT (similar
  2539. to Flattened Device Tree). It allows the use of images with multiple
  2540. components (several kernels, ramdisks, etc.), with contents protected by
  2541. SHA1, MD5 or CRC32. More details are found in the doc/uImage.FIT directory.
  2542. Old uImage format
  2543. -----------------
  2544. Old image format is based on binary files which can be basically anything,
  2545. preceded by a special header; see the definitions in include/image.h for
  2546. details; basically, the header defines the following image properties:
  2547. * Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD,
  2548. 4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks,
  2549. LynxOS, pSOS, QNX, RTEMS, INTEGRITY;
  2550. Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, LynxOS,
  2551. INTEGRITY).
  2552. * Target CPU Architecture (Provisions for Alpha, ARM, AVR32, Intel x86,
  2553. IA64, MIPS, Nios II, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit;
  2554. Currently supported: ARM, AVR32, Intel x86, MIPS, Nios II, PowerPC).
  2555. * Compression Type (uncompressed, gzip, bzip2)
  2556. * Load Address
  2557. * Entry Point
  2558. * Image Name
  2559. * Image Timestamp
  2560. The header is marked by a special Magic Number, and both the header
  2561. and the data portions of the image are secured against corruption by
  2562. CRC32 checksums.
  2563. Linux Support:
  2564. ==============
  2565. Although U-Boot should support any OS or standalone application
  2566. easily, the main focus has always been on Linux during the design of
  2567. U-Boot.
  2568. U-Boot includes many features that so far have been part of some
  2569. special "boot loader" code within the Linux kernel. Also, any
  2570. "initrd" images to be used are no longer part of one big Linux image;
  2571. instead, kernel and "initrd" are separate images. This implementation
  2572. serves several purposes:
  2573. - the same features can be used for other OS or standalone
  2574. applications (for instance: using compressed images to reduce the
  2575. Flash memory footprint)
  2576. - it becomes much easier to port new Linux kernel versions because
  2577. lots of low-level, hardware dependent stuff are done by U-Boot
  2578. - the same Linux kernel image can now be used with different "initrd"
  2579. images; of course this also means that different kernel images can
  2580. be run with the same "initrd". This makes testing easier (you don't
  2581. have to build a new "zImage.initrd" Linux image when you just
  2582. change a file in your "initrd"). Also, a field-upgrade of the
  2583. software is easier now.
  2584. Linux HOWTO:
  2585. ============
  2586. Porting Linux to U-Boot based systems:
  2587. ---------------------------------------
  2588. U-Boot cannot save you from doing all the necessary modifications to
  2589. configure the Linux device drivers for use with your target hardware
  2590. (no, we don't intend to provide a full virtual machine interface to
  2591. Linux :-).
  2592. But now you can ignore ALL boot loader code (in arch/powerpc/mbxboot).
  2593. Just make sure your machine specific header file (for instance
  2594. include/asm-ppc/tqm8xx.h) includes the same definition of the Board
  2595. Information structure as we define in include/asm-<arch>/u-boot.h,
  2596. and make sure that your definition of IMAP_ADDR uses the same value
  2597. as your U-Boot configuration in CONFIG_SYS_IMMR.
  2598. Configuring the Linux kernel:
  2599. -----------------------------
  2600. No specific requirements for U-Boot. Make sure you have some root
  2601. device (initial ramdisk, NFS) for your target system.
  2602. Building a Linux Image:
  2603. -----------------------
  2604. With U-Boot, "normal" build targets like "zImage" or "bzImage" are
  2605. not used. If you use recent kernel source, a new build target
  2606. "uImage" will exist which automatically builds an image usable by
  2607. U-Boot. Most older kernels also have support for a "pImage" target,
  2608. which was introduced for our predecessor project PPCBoot and uses a
  2609. 100% compatible format.
  2610. Example:
  2611. make TQM850L_config
  2612. make oldconfig
  2613. make dep
  2614. make uImage
  2615. The "uImage" build target uses a special tool (in 'tools/mkimage') to
  2616. encapsulate a compressed Linux kernel image with header information,
  2617. CRC32 checksum etc. for use with U-Boot. This is what we are doing:
  2618. * build a standard "vmlinux" kernel image (in ELF binary format):
  2619. * convert the kernel into a raw binary image:
  2620. ${CROSS_COMPILE}-objcopy -O binary \
  2621. -R .note -R .comment \
  2622. -S vmlinux linux.bin
  2623. * compress the binary image:
  2624. gzip -9 linux.bin
  2625. * package compressed binary image for U-Boot:
  2626. mkimage -A ppc -O linux -T kernel -C gzip \
  2627. -a 0 -e 0 -n "Linux Kernel Image" \
  2628. -d linux.bin.gz uImage
  2629. The "mkimage" tool can also be used to create ramdisk images for use
  2630. with U-Boot, either separated from the Linux kernel image, or
  2631. combined into one file. "mkimage" encapsulates the images with a 64
  2632. byte header containing information about target architecture,
  2633. operating system, image type, compression method, entry points, time
  2634. stamp, CRC32 checksums, etc.
  2635. "mkimage" can be called in two ways: to verify existing images and
  2636. print the header information, or to build new images.
  2637. In the first form (with "-l" option) mkimage lists the information
  2638. contained in the header of an existing U-Boot image; this includes
  2639. checksum verification:
  2640. tools/mkimage -l image
  2641. -l ==> list image header information
  2642. The second form (with "-d" option) is used to build a U-Boot image
  2643. from a "data file" which is used as image payload:
  2644. tools/mkimage -A arch -O os -T type -C comp -a addr -e ep \
  2645. -n name -d data_file image
  2646. -A ==> set architecture to 'arch'
  2647. -O ==> set operating system to 'os'
  2648. -T ==> set image type to 'type'
  2649. -C ==> set compression type 'comp'
  2650. -a ==> set load address to 'addr' (hex)
  2651. -e ==> set entry point to 'ep' (hex)
  2652. -n ==> set image name to 'name'
  2653. -d ==> use image data from 'datafile'
  2654. Right now, all Linux kernels for PowerPC systems use the same load
  2655. address (0x00000000), but the entry point address depends on the
  2656. kernel version:
  2657. - 2.2.x kernels have the entry point at 0x0000000C,
  2658. - 2.3.x and later kernels have the entry point at 0x00000000.
  2659. So a typical call to build a U-Boot image would read:
  2660. -> tools/mkimage -n '2.4.4 kernel for TQM850L' \
  2661. > -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \
  2662. > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz \
  2663. > examples/uImage.TQM850L
  2664. Image Name: 2.4.4 kernel for TQM850L
  2665. Created: Wed Jul 19 02:34:59 2000
  2666. Image Type: PowerPC Linux Kernel Image (gzip compressed)
  2667. Data Size: 335725 Bytes = 327.86 kB = 0.32 MB
  2668. Load Address: 0x00000000
  2669. Entry Point: 0x00000000
  2670. To verify the contents of the image (or check for corruption):
  2671. -> tools/mkimage -l examples/uImage.TQM850L
  2672. Image Name: 2.4.4 kernel for TQM850L
  2673. Created: Wed Jul 19 02:34:59 2000
  2674. Image Type: PowerPC Linux Kernel Image (gzip compressed)
  2675. Data Size: 335725 Bytes = 327.86 kB = 0.32 MB
  2676. Load Address: 0x00000000
  2677. Entry Point: 0x00000000
  2678. NOTE: for embedded systems where boot time is critical you can trade
  2679. speed for memory and install an UNCOMPRESSED image instead: this
  2680. needs more space in Flash, but boots much faster since it does not
  2681. need to be uncompressed:
  2682. -> gunzip /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz
  2683. -> tools/mkimage -n '2.4.4 kernel for TQM850L' \
  2684. > -A ppc -O linux -T kernel -C none -a 0 -e 0 \
  2685. > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux \
  2686. > examples/uImage.TQM850L-uncompressed
  2687. Image Name: 2.4.4 kernel for TQM850L
  2688. Created: Wed Jul 19 02:34:59 2000
  2689. Image Type: PowerPC Linux Kernel Image (uncompressed)
  2690. Data Size: 792160 Bytes = 773.59 kB = 0.76 MB
  2691. Load Address: 0x00000000
  2692. Entry Point: 0x00000000
  2693. Similar you can build U-Boot images from a 'ramdisk.image.gz' file
  2694. when your kernel is intended to use an initial ramdisk:
  2695. -> tools/mkimage -n 'Simple Ramdisk Image' \
  2696. > -A ppc -O linux -T ramdisk -C gzip \
  2697. > -d /LinuxPPC/images/SIMPLE-ramdisk.image.gz examples/simple-initrd
  2698. Image Name: Simple Ramdisk Image
  2699. Created: Wed Jan 12 14:01:50 2000
  2700. Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
  2701. Data Size: 566530 Bytes = 553.25 kB = 0.54 MB
  2702. Load Address: 0x00000000
  2703. Entry Point: 0x00000000
  2704. Installing a Linux Image:
  2705. -------------------------
  2706. To downloading a U-Boot image over the serial (console) interface,
  2707. you must convert the image to S-Record format:
  2708. objcopy -I binary -O srec examples/image examples/image.srec
  2709. The 'objcopy' does not understand the information in the U-Boot
  2710. image header, so the resulting S-Record file will be relative to
  2711. address 0x00000000. To load it to a given address, you need to
  2712. specify the target address as 'offset' parameter with the 'loads'
  2713. command.
  2714. Example: install the image to address 0x40100000 (which on the
  2715. TQM8xxL is in the first Flash bank):
  2716. => erase 40100000 401FFFFF
  2717. .......... done
  2718. Erased 8 sectors
  2719. => loads 40100000
  2720. ## Ready for S-Record download ...
  2721. ~>examples/image.srec
  2722. 1 2 3 4 5 6 7 8 9 10 11 12 13 ...
  2723. ...
  2724. 15989 15990 15991 15992
  2725. [file transfer complete]
  2726. [connected]
  2727. ## Start Addr = 0x00000000
  2728. You can check the success of the download using the 'iminfo' command;
  2729. this includes a checksum verification so you can be sure no data
  2730. corruption happened:
  2731. => imi 40100000
  2732. ## Checking Image at 40100000 ...
  2733. Image Name: 2.2.13 for initrd on TQM850L
  2734. Image Type: PowerPC Linux Kernel Image (gzip compressed)
  2735. Data Size: 335725 Bytes = 327 kB = 0 MB
  2736. Load Address: 00000000
  2737. Entry Point: 0000000c
  2738. Verifying Checksum ... OK
  2739. Boot Linux:
  2740. -----------
  2741. The "bootm" command is used to boot an application that is stored in
  2742. memory (RAM or Flash). In case of a Linux kernel image, the contents
  2743. of the "bootargs" environment variable is passed to the kernel as
  2744. parameters. You can check and modify this variable using the
  2745. "printenv" and "setenv" commands:
  2746. => printenv bootargs
  2747. bootargs=root=/dev/ram
  2748. => setenv bootargs root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
  2749. => printenv bootargs
  2750. bootargs=root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
  2751. => bootm 40020000
  2752. ## Booting Linux kernel at 40020000 ...
  2753. Image Name: 2.2.13 for NFS on TQM850L
  2754. Image Type: PowerPC Linux Kernel Image (gzip compressed)
  2755. Data Size: 381681 Bytes = 372 kB = 0 MB
  2756. Load Address: 00000000
  2757. Entry Point: 0000000c
  2758. Verifying Checksum ... OK
  2759. Uncompressing Kernel Image ... OK
  2760. 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
  2761. Boot arguments: root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
  2762. time_init: decrementer frequency = 187500000/60
  2763. Calibrating delay loop... 49.77 BogoMIPS
  2764. Memory: 15208k available (700k kernel code, 444k data, 32k init) [c0000000,c1000000]
  2765. ...
  2766. If you want to boot a Linux kernel with initial RAM disk, you pass
  2767. the memory addresses of both the kernel and the initrd image (PPBCOOT
  2768. format!) to the "bootm" command:
  2769. => imi 40100000 40200000
  2770. ## Checking Image at 40100000 ...
  2771. Image Name: 2.2.13 for initrd on TQM850L
  2772. Image Type: PowerPC Linux Kernel Image (gzip compressed)
  2773. Data Size: 335725 Bytes = 327 kB = 0 MB
  2774. Load Address: 00000000
  2775. Entry Point: 0000000c
  2776. Verifying Checksum ... OK
  2777. ## Checking Image at 40200000 ...
  2778. Image Name: Simple Ramdisk Image
  2779. Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
  2780. Data Size: 566530 Bytes = 553 kB = 0 MB
  2781. Load Address: 00000000
  2782. Entry Point: 00000000
  2783. Verifying Checksum ... OK
  2784. => bootm 40100000 40200000
  2785. ## Booting Linux kernel at 40100000 ...
  2786. Image Name: 2.2.13 for initrd on TQM850L
  2787. Image Type: PowerPC Linux Kernel Image (gzip compressed)
  2788. Data Size: 335725 Bytes = 327 kB = 0 MB
  2789. Load Address: 00000000
  2790. Entry Point: 0000000c
  2791. Verifying Checksum ... OK
  2792. Uncompressing Kernel Image ... OK
  2793. ## Loading RAMDisk Image at 40200000 ...
  2794. Image Name: Simple Ramdisk Image
  2795. Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
  2796. Data Size: 566530 Bytes = 553 kB = 0 MB
  2797. Load Address: 00000000
  2798. Entry Point: 00000000
  2799. Verifying Checksum ... OK
  2800. Loading Ramdisk ... OK
  2801. 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
  2802. Boot arguments: root=/dev/ram
  2803. time_init: decrementer frequency = 187500000/60
  2804. Calibrating delay loop... 49.77 BogoMIPS
  2805. ...
  2806. RAMDISK: Compressed image found at block 0
  2807. VFS: Mounted root (ext2 filesystem).
  2808. bash#
  2809. Boot Linux and pass a flat device tree:
  2810. -----------
  2811. First, U-Boot must be compiled with the appropriate defines. See the section
  2812. titled "Linux Kernel Interface" above for a more in depth explanation. The
  2813. following is an example of how to start a kernel and pass an updated
  2814. flat device tree:
  2815. => print oftaddr
  2816. oftaddr=0x300000
  2817. => print oft
  2818. oft=oftrees/mpc8540ads.dtb
  2819. => tftp $oftaddr $oft
  2820. Speed: 1000, full duplex
  2821. Using TSEC0 device
  2822. TFTP from server 192.168.1.1; our IP address is 192.168.1.101
  2823. Filename 'oftrees/mpc8540ads.dtb'.
  2824. Load address: 0x300000
  2825. Loading: #
  2826. done
  2827. Bytes transferred = 4106 (100a hex)
  2828. => tftp $loadaddr $bootfile
  2829. Speed: 1000, full duplex
  2830. Using TSEC0 device
  2831. TFTP from server 192.168.1.1; our IP address is 192.168.1.2
  2832. Filename 'uImage'.
  2833. Load address: 0x200000
  2834. Loading:############
  2835. done
  2836. Bytes transferred = 1029407 (fb51f hex)
  2837. => print loadaddr
  2838. loadaddr=200000
  2839. => print oftaddr
  2840. oftaddr=0x300000
  2841. => bootm $loadaddr - $oftaddr
  2842. ## Booting image at 00200000 ...
  2843. Image Name: Linux-2.6.17-dirty
  2844. Image Type: PowerPC Linux Kernel Image (gzip compressed)
  2845. Data Size: 1029343 Bytes = 1005.2 kB
  2846. Load Address: 00000000
  2847. Entry Point: 00000000
  2848. Verifying Checksum ... OK
  2849. Uncompressing Kernel Image ... OK
  2850. Booting using flat device tree at 0x300000
  2851. Using MPC85xx ADS machine description
  2852. Memory CAM mapping: CAM0=256Mb, CAM1=256Mb, CAM2=0Mb residual: 0Mb
  2853. [snip]
  2854. More About U-Boot Image Types:
  2855. ------------------------------
  2856. U-Boot supports the following image types:
  2857. "Standalone Programs" are directly runnable in the environment
  2858. provided by U-Boot; it is expected that (if they behave
  2859. well) you can continue to work in U-Boot after return from
  2860. the Standalone Program.
  2861. "OS Kernel Images" are usually images of some Embedded OS which
  2862. will take over control completely. Usually these programs
  2863. will install their own set of exception handlers, device
  2864. drivers, set up the MMU, etc. - this means, that you cannot
  2865. expect to re-enter U-Boot except by resetting the CPU.
  2866. "RAMDisk Images" are more or less just data blocks, and their
  2867. parameters (address, size) are passed to an OS kernel that is
  2868. being started.
  2869. "Multi-File Images" contain several images, typically an OS
  2870. (Linux) kernel image and one or more data images like
  2871. RAMDisks. This construct is useful for instance when you want
  2872. to boot over the network using BOOTP etc., where the boot
  2873. server provides just a single image file, but you want to get
  2874. for instance an OS kernel and a RAMDisk image.
  2875. "Multi-File Images" start with a list of image sizes, each
  2876. image size (in bytes) specified by an "uint32_t" in network
  2877. byte order. This list is terminated by an "(uint32_t)0".
  2878. Immediately after the terminating 0 follow the images, one by
  2879. one, all aligned on "uint32_t" boundaries (size rounded up to
  2880. a multiple of 4 bytes).
  2881. "Firmware Images" are binary images containing firmware (like
  2882. U-Boot or FPGA images) which usually will be programmed to
  2883. flash memory.
  2884. "Script files" are command sequences that will be executed by
  2885. U-Boot's command interpreter; this feature is especially
  2886. useful when you configure U-Boot to use a real shell (hush)
  2887. as command interpreter.
  2888. Standalone HOWTO:
  2889. =================
  2890. One of the features of U-Boot is that you can dynamically load and
  2891. run "standalone" applications, which can use some resources of
  2892. U-Boot like console I/O functions or interrupt services.
  2893. Two simple examples are included with the sources:
  2894. "Hello World" Demo:
  2895. -------------------
  2896. 'examples/hello_world.c' contains a small "Hello World" Demo
  2897. application; it is automatically compiled when you build U-Boot.
  2898. It's configured to run at address 0x00040004, so you can play with it
  2899. like that:
  2900. => loads
  2901. ## Ready for S-Record download ...
  2902. ~>examples/hello_world.srec
  2903. 1 2 3 4 5 6 7 8 9 10 11 ...
  2904. [file transfer complete]
  2905. [connected]
  2906. ## Start Addr = 0x00040004
  2907. => go 40004 Hello World! This is a test.
  2908. ## Starting application at 0x00040004 ...
  2909. Hello World
  2910. argc = 7
  2911. argv[0] = "40004"
  2912. argv[1] = "Hello"
  2913. argv[2] = "World!"
  2914. argv[3] = "This"
  2915. argv[4] = "is"
  2916. argv[5] = "a"
  2917. argv[6] = "test."
  2918. argv[7] = "<NULL>"
  2919. Hit any key to exit ...
  2920. ## Application terminated, rc = 0x0
  2921. Another example, which demonstrates how to register a CPM interrupt
  2922. handler with the U-Boot code, can be found in 'examples/timer.c'.
  2923. Here, a CPM timer is set up to generate an interrupt every second.
  2924. The interrupt service routine is trivial, just printing a '.'
  2925. character, but this is just a demo program. The application can be
  2926. controlled by the following keys:
  2927. ? - print current values og the CPM Timer registers
  2928. b - enable interrupts and start timer
  2929. e - stop timer and disable interrupts
  2930. q - quit application
  2931. => loads
  2932. ## Ready for S-Record download ...
  2933. ~>examples/timer.srec
  2934. 1 2 3 4 5 6 7 8 9 10 11 ...
  2935. [file transfer complete]
  2936. [connected]
  2937. ## Start Addr = 0x00040004
  2938. => go 40004
  2939. ## Starting application at 0x00040004 ...
  2940. TIMERS=0xfff00980
  2941. Using timer 1
  2942. tgcr @ 0xfff00980, tmr @ 0xfff00990, trr @ 0xfff00994, tcr @ 0xfff00998, tcn @ 0xfff0099c, ter @ 0xfff009b0
  2943. Hit 'b':
  2944. [q, b, e, ?] Set interval 1000000 us
  2945. Enabling timer
  2946. Hit '?':
  2947. [q, b, e, ?] ........
  2948. tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0xef6, ter=0x0
  2949. Hit '?':
  2950. [q, b, e, ?] .
  2951. tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x2ad4, ter=0x0
  2952. Hit '?':
  2953. [q, b, e, ?] .
  2954. tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x1efc, ter=0x0
  2955. Hit '?':
  2956. [q, b, e, ?] .
  2957. tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x169d, ter=0x0
  2958. Hit 'e':
  2959. [q, b, e, ?] ...Stopping timer
  2960. Hit 'q':
  2961. [q, b, e, ?] ## Application terminated, rc = 0x0
  2962. Minicom warning:
  2963. ================
  2964. Over time, many people have reported problems when trying to use the
  2965. "minicom" terminal emulation program for serial download. I (wd)
  2966. consider minicom to be broken, and recommend not to use it. Under
  2967. Unix, I recommend to use C-Kermit for general purpose use (and
  2968. especially for kermit binary protocol download ("loadb" command), and
  2969. use "cu" for S-Record download ("loads" command).
  2970. Nevertheless, if you absolutely want to use it try adding this
  2971. configuration to your "File transfer protocols" section:
  2972. Name Program Name U/D FullScr IO-Red. Multi
  2973. X kermit /usr/bin/kermit -i -l %l -s Y U Y N N
  2974. Y kermit /usr/bin/kermit -i -l %l -r N D Y N N
  2975. NetBSD Notes:
  2976. =============
  2977. Starting at version 0.9.2, U-Boot supports NetBSD both as host
  2978. (build U-Boot) and target system (boots NetBSD/mpc8xx).
  2979. Building requires a cross environment; it is known to work on
  2980. NetBSD/i386 with the cross-powerpc-netbsd-1.3 package (you will also
  2981. need gmake since the Makefiles are not compatible with BSD make).
  2982. Note that the cross-powerpc package does not install include files;
  2983. attempting to build U-Boot will fail because <machine/ansi.h> is
  2984. missing. This file has to be installed and patched manually:
  2985. # cd /usr/pkg/cross/powerpc-netbsd/include
  2986. # mkdir powerpc
  2987. # ln -s powerpc machine
  2988. # cp /usr/src/sys/arch/powerpc/include/ansi.h powerpc/ansi.h
  2989. # ${EDIT} powerpc/ansi.h ## must remove __va_list, _BSD_VA_LIST
  2990. Native builds *don't* work due to incompatibilities between native
  2991. and U-Boot include files.
  2992. Booting assumes that (the first part of) the image booted is a
  2993. stage-2 loader which in turn loads and then invokes the kernel
  2994. proper. Loader sources will eventually appear in the NetBSD source
  2995. tree (probably in sys/arc/mpc8xx/stand/u-boot_stage2/); in the
  2996. meantime, see ftp://ftp.denx.de/pub/u-boot/ppcboot_stage2.tar.gz
  2997. Implementation Internals:
  2998. =========================
  2999. The following is not intended to be a complete description of every
  3000. implementation detail. However, it should help to understand the
  3001. inner workings of U-Boot and make it easier to port it to custom
  3002. hardware.
  3003. Initial Stack, Global Data:
  3004. ---------------------------
  3005. The implementation of U-Boot is complicated by the fact that U-Boot
  3006. starts running out of ROM (flash memory), usually without access to
  3007. system RAM (because the memory controller is not initialized yet).
  3008. This means that we don't have writable Data or BSS segments, and BSS
  3009. is not initialized as zero. To be able to get a C environment working
  3010. at all, we have to allocate at least a minimal stack. Implementation
  3011. options for this are defined and restricted by the CPU used: Some CPU
  3012. models provide on-chip memory (like the IMMR area on MPC8xx and
  3013. MPC826x processors), on others (parts of) the data cache can be
  3014. locked as (mis-) used as memory, etc.
  3015. Chris Hallinan posted a good summary of these issues to the
  3016. U-Boot mailing list:
  3017. Subject: RE: [U-Boot-Users] RE: More On Memory Bank x (nothingness)?
  3018. From: "Chris Hallinan" <clh@net1plus.com>
  3019. Date: Mon, 10 Feb 2003 16:43:46 -0500 (22:43 MET)
  3020. ...
  3021. Correct me if I'm wrong, folks, but the way I understand it
  3022. is this: Using DCACHE as initial RAM for Stack, etc, does not
  3023. require any physical RAM backing up the cache. The cleverness
  3024. is that the cache is being used as a temporary supply of
  3025. necessary storage before the SDRAM controller is setup. It's
  3026. beyond the scope of this list to explain the details, but you
  3027. can see how this works by studying the cache architecture and
  3028. operation in the architecture and processor-specific manuals.
  3029. OCM is On Chip Memory, which I believe the 405GP has 4K. It
  3030. is another option for the system designer to use as an
  3031. initial stack/RAM area prior to SDRAM being available. Either
  3032. option should work for you. Using CS 4 should be fine if your
  3033. board designers haven't used it for something that would
  3034. cause you grief during the initial boot! It is frequently not
  3035. used.
  3036. CONFIG_SYS_INIT_RAM_ADDR should be somewhere that won't interfere
  3037. with your processor/board/system design. The default value
  3038. you will find in any recent u-boot distribution in
  3039. walnut.h should work for you. I'd set it to a value larger
  3040. than your SDRAM module. If you have a 64MB SDRAM module, set
  3041. it above 400_0000. Just make sure your board has no resources
  3042. that are supposed to respond to that address! That code in
  3043. start.S has been around a while and should work as is when
  3044. you get the config right.
  3045. -Chris Hallinan
  3046. DS4.COM, Inc.
  3047. It is essential to remember this, since it has some impact on the C
  3048. code for the initialization procedures:
  3049. * Initialized global data (data segment) is read-only. Do not attempt
  3050. to write it.
  3051. * Do not use any uninitialized global data (or implicitely initialized
  3052. as zero data - BSS segment) at all - this is undefined, initiali-
  3053. zation is performed later (when relocating to RAM).
  3054. * Stack space is very limited. Avoid big data buffers or things like
  3055. that.
  3056. Having only the stack as writable memory limits means we cannot use
  3057. normal global data to share information beween the code. But it
  3058. turned out that the implementation of U-Boot can be greatly
  3059. simplified by making a global data structure (gd_t) available to all
  3060. functions. We could pass a pointer to this data as argument to _all_
  3061. functions, but this would bloat the code. Instead we use a feature of
  3062. the GCC compiler (Global Register Variables) to share the data: we
  3063. place a pointer (gd) to the global data into a register which we
  3064. reserve for this purpose.
  3065. When choosing a register for such a purpose we are restricted by the
  3066. relevant (E)ABI specifications for the current architecture, and by
  3067. GCC's implementation.
  3068. For PowerPC, the following registers have specific use:
  3069. R1: stack pointer
  3070. R2: reserved for system use
  3071. R3-R4: parameter passing and return values
  3072. R5-R10: parameter passing
  3073. R13: small data area pointer
  3074. R30: GOT pointer
  3075. R31: frame pointer
  3076. (U-Boot also uses R12 as internal GOT pointer. r12
  3077. is a volatile register so r12 needs to be reset when
  3078. going back and forth between asm and C)
  3079. ==> U-Boot will use R2 to hold a pointer to the global data
  3080. Note: on PPC, we could use a static initializer (since the
  3081. address of the global data structure is known at compile time),
  3082. but it turned out that reserving a register results in somewhat
  3083. smaller code - although the code savings are not that big (on
  3084. average for all boards 752 bytes for the whole U-Boot image,
  3085. 624 text + 127 data).
  3086. On Blackfin, the normal C ABI (except for P3) is followed as documented here:
  3087. http://docs.blackfin.uclinux.org/doku.php?id=application_binary_interface
  3088. ==> U-Boot will use P3 to hold a pointer to the global data
  3089. On ARM, the following registers are used:
  3090. R0: function argument word/integer result
  3091. R1-R3: function argument word
  3092. R9: GOT pointer
  3093. R10: stack limit (used only if stack checking if enabled)
  3094. R11: argument (frame) pointer
  3095. R12: temporary workspace
  3096. R13: stack pointer
  3097. R14: link register
  3098. R15: program counter
  3099. ==> U-Boot will use R8 to hold a pointer to the global data
  3100. On Nios II, the ABI is documented here:
  3101. http://www.altera.com/literature/hb/nios2/n2cpu_nii51016.pdf
  3102. ==> U-Boot will use gp to hold a pointer to the global data
  3103. Note: on Nios II, we give "-G0" option to gcc and don't use gp
  3104. to access small data sections, so gp is free.
  3105. NOTE: DECLARE_GLOBAL_DATA_PTR must be used with file-global scope,
  3106. or current versions of GCC may "optimize" the code too much.
  3107. Memory Management:
  3108. ------------------
  3109. U-Boot runs in system state and uses physical addresses, i.e. the
  3110. MMU is not used either for address mapping nor for memory protection.
  3111. The available memory is mapped to fixed addresses using the memory
  3112. controller. In this process, a contiguous block is formed for each
  3113. memory type (Flash, SDRAM, SRAM), even when it consists of several
  3114. physical memory banks.
  3115. U-Boot is installed in the first 128 kB of the first Flash bank (on
  3116. TQM8xxL modules this is the range 0x40000000 ... 0x4001FFFF). After
  3117. booting and sizing and initializing DRAM, the code relocates itself
  3118. to the upper end of DRAM. Immediately below the U-Boot code some
  3119. memory is reserved for use by malloc() [see CONFIG_SYS_MALLOC_LEN
  3120. configuration setting]. Below that, a structure with global Board
  3121. Info data is placed, followed by the stack (growing downward).
  3122. Additionally, some exception handler code is copied to the low 8 kB
  3123. of DRAM (0x00000000 ... 0x00001FFF).
  3124. So a typical memory configuration with 16 MB of DRAM could look like
  3125. this:
  3126. 0x0000 0000 Exception Vector code
  3127. :
  3128. 0x0000 1FFF
  3129. 0x0000 2000 Free for Application Use
  3130. :
  3131. :
  3132. :
  3133. :
  3134. 0x00FB FF20 Monitor Stack (Growing downward)
  3135. 0x00FB FFAC Board Info Data and permanent copy of global data
  3136. 0x00FC 0000 Malloc Arena
  3137. :
  3138. 0x00FD FFFF
  3139. 0x00FE 0000 RAM Copy of Monitor Code
  3140. ... eventually: LCD or video framebuffer
  3141. ... eventually: pRAM (Protected RAM - unchanged by reset)
  3142. 0x00FF FFFF [End of RAM]
  3143. System Initialization:
  3144. ----------------------
  3145. In the reset configuration, U-Boot starts at the reset entry point
  3146. (on most PowerPC systems at address 0x00000100). Because of the reset
  3147. configuration for CS0# this is a mirror of the onboard Flash memory.
  3148. To be able to re-map memory U-Boot then jumps to its link address.
  3149. To be able to implement the initialization code in C, a (small!)
  3150. initial stack is set up in the internal Dual Ported RAM (in case CPUs
  3151. which provide such a feature like MPC8xx or MPC8260), or in a locked
  3152. part of the data cache. After that, U-Boot initializes the CPU core,
  3153. the caches and the SIU.
  3154. Next, all (potentially) available memory banks are mapped using a
  3155. preliminary mapping. For example, we put them on 512 MB boundaries
  3156. (multiples of 0x20000000: SDRAM on 0x00000000 and 0x20000000, Flash
  3157. on 0x40000000 and 0x60000000, SRAM on 0x80000000). Then UPM A is
  3158. programmed for SDRAM access. Using the temporary configuration, a
  3159. simple memory test is run that determines the size of the SDRAM
  3160. banks.
  3161. When there is more than one SDRAM bank, and the banks are of
  3162. different size, the largest is mapped first. For equal size, the first
  3163. bank (CS2#) is mapped first. The first mapping is always for address
  3164. 0x00000000, with any additional banks following immediately to create
  3165. contiguous memory starting from 0.
  3166. Then, the monitor installs itself at the upper end of the SDRAM area
  3167. and allocates memory for use by malloc() and for the global Board
  3168. Info data; also, the exception vector code is copied to the low RAM
  3169. pages, and the final stack is set up.
  3170. Only after this relocation will you have a "normal" C environment;
  3171. until that you are restricted in several ways, mostly because you are
  3172. running from ROM, and because the code will have to be relocated to a
  3173. new address in RAM.
  3174. U-Boot Porting Guide:
  3175. ----------------------
  3176. [Based on messages by Jerry Van Baren in the U-Boot-Users mailing
  3177. list, October 2002]
  3178. int main(int argc, char *argv[])
  3179. {
  3180. sighandler_t no_more_time;
  3181. signal(SIGALRM, no_more_time);
  3182. alarm(PROJECT_DEADLINE - toSec (3 * WEEK));
  3183. if (available_money > available_manpower) {
  3184. Pay consultant to port U-Boot;
  3185. return 0;
  3186. }
  3187. Download latest U-Boot source;
  3188. Subscribe to u-boot mailing list;
  3189. if (clueless)
  3190. email("Hi, I am new to U-Boot, how do I get started?");
  3191. while (learning) {
  3192. Read the README file in the top level directory;
  3193. Read http://www.denx.de/twiki/bin/view/DULG/Manual;
  3194. Read applicable doc/*.README;
  3195. Read the source, Luke;
  3196. /* find . -name "*.[chS]" | xargs grep -i <keyword> */
  3197. }
  3198. if (available_money > toLocalCurrency ($2500))
  3199. Buy a BDI3000;
  3200. else
  3201. Add a lot of aggravation and time;
  3202. if (a similar board exists) { /* hopefully... */
  3203. cp -a board/<similar> board/<myboard>
  3204. cp include/configs/<similar>.h include/configs/<myboard>.h
  3205. } else {
  3206. Create your own board support subdirectory;
  3207. Create your own board include/configs/<myboard>.h file;
  3208. }
  3209. Edit new board/<myboard> files
  3210. Edit new include/configs/<myboard>.h
  3211. while (!accepted) {
  3212. while (!running) {
  3213. do {
  3214. Add / modify source code;
  3215. } until (compiles);
  3216. Debug;
  3217. if (clueless)
  3218. email("Hi, I am having problems...");
  3219. }
  3220. Send patch file to the U-Boot email list;
  3221. if (reasonable critiques)
  3222. Incorporate improvements from email list code review;
  3223. else
  3224. Defend code as written;
  3225. }
  3226. return 0;
  3227. }
  3228. void no_more_time (int sig)
  3229. {
  3230. hire_a_guru();
  3231. }
  3232. Coding Standards:
  3233. -----------------
  3234. All contributions to U-Boot should conform to the Linux kernel
  3235. coding style; see the file "Documentation/CodingStyle" and the script
  3236. "scripts/Lindent" in your Linux kernel source directory. In sources
  3237. originating from U-Boot a style corresponding to "Lindent -pcs" (adding
  3238. spaces before parameters to function calls) is actually used.
  3239. Source files originating from a different project (for example the
  3240. MTD subsystem) are generally exempt from these guidelines and are not
  3241. reformated to ease subsequent migration to newer versions of those
  3242. sources.
  3243. Please note that U-Boot is implemented in C (and to some small parts in
  3244. Assembler); no C++ is used, so please do not use C++ style comments (//)
  3245. in your code.
  3246. Please also stick to the following formatting rules:
  3247. - remove any trailing white space
  3248. - use TAB characters for indentation, not spaces
  3249. - make sure NOT to use DOS '\r\n' line feeds
  3250. - do not add more than 2 empty lines to source files
  3251. - do not add trailing empty lines to source files
  3252. Submissions which do not conform to the standards may be returned
  3253. with a request to reformat the changes.
  3254. Submitting Patches:
  3255. -------------------
  3256. Since the number of patches for U-Boot is growing, we need to
  3257. establish some rules. Submissions which do not conform to these rules
  3258. may be rejected, even when they contain important and valuable stuff.
  3259. Please see http://www.denx.de/wiki/U-Boot/Patches for details.
  3260. Patches shall be sent to the u-boot mailing list <u-boot@lists.denx.de>;
  3261. see http://lists.denx.de/mailman/listinfo/u-boot
  3262. When you send a patch, please include the following information with
  3263. it:
  3264. * For bug fixes: a description of the bug and how your patch fixes
  3265. this bug. Please try to include a way of demonstrating that the
  3266. patch actually fixes something.
  3267. * For new features: a description of the feature and your
  3268. implementation.
  3269. * A CHANGELOG entry as plaintext (separate from the patch)
  3270. * For major contributions, your entry to the CREDITS file
  3271. * When you add support for a new board, don't forget to add this
  3272. board to the MAKEALL script, too.
  3273. * If your patch adds new configuration options, don't forget to
  3274. document these in the README file.
  3275. * The patch itself. If you are using git (which is *strongly*
  3276. recommended) you can easily generate the patch using the
  3277. "git-format-patch". If you then use "git-send-email" to send it to
  3278. the U-Boot mailing list, you will avoid most of the common problems
  3279. with some other mail clients.
  3280. If you cannot use git, use "diff -purN OLD NEW". If your version of
  3281. diff does not support these options, then get the latest version of
  3282. GNU diff.
  3283. The current directory when running this command shall be the parent
  3284. directory of the U-Boot source tree (i. e. please make sure that
  3285. your patch includes sufficient directory information for the
  3286. affected files).
  3287. We prefer patches as plain text. MIME attachments are discouraged,
  3288. and compressed attachments must not be used.
  3289. * If one logical set of modifications affects or creates several
  3290. files, all these changes shall be submitted in a SINGLE patch file.
  3291. * Changesets that contain different, unrelated modifications shall be
  3292. submitted as SEPARATE patches, one patch per changeset.
  3293. Notes:
  3294. * Before sending the patch, run the MAKEALL script on your patched
  3295. source tree and make sure that no errors or warnings are reported
  3296. for any of the boards.
  3297. * Keep your modifications to the necessary minimum: A patch
  3298. containing several unrelated changes or arbitrary reformats will be
  3299. returned with a request to re-formatting / split it.
  3300. * If you modify existing code, make sure that your new code does not
  3301. add to the memory footprint of the code ;-) Small is beautiful!
  3302. When adding new features, these should compile conditionally only
  3303. (using #ifdef), and the resulting code with the new feature
  3304. disabled must not need more memory than the old code without your
  3305. modification.
  3306. * Remember that there is a size limit of 100 kB per message on the
  3307. u-boot mailing list. Bigger patches will be moderated. If they are
  3308. reasonable and not too big, they will be acknowledged. But patches
  3309. bigger than the size limit should be avoided.