2 # (C) Copyright 2000 - 2002
5 # See file CREDITS for list of people who contributed to this
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.
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.
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,
27 This directory contains the source code for U-Boot, a boot loader for
28 Embedded boards based on PowerPC and ARM processors, which can be
29 installed in a boot ROM and used to initialize and test the hardware
30 or to download and run application code.
32 The development of U-Boot is closely related to Linux: some parts of
33 the source code originate in the Linux source tree, we have some
34 header files in common, and special provision has been made to
35 support booting of Linux images.
37 Some attention has been paid to make this software easily
38 configurable and extendable. For instance, all monitor commands are
39 implemented with the same call interface, so that it's very easy to
40 add new commands. Also, instead of permanently adding rarely used
41 code (for instance hardware test utilities) to the monitor, you can
42 load and run it dynamically.
48 In general, all boards for which a configuration option exists in the
49 Makefile have been tested to some extent and can be considered
50 "working". In fact, many of them are used in production systems.
52 In case of problems see the CHANGELOG and CREDITS files to find out
53 who contributed the specific port.
59 In case you have questions about, problems with or contributions for
60 U-Boot you should send a message to the U-Boot mailing list at
62 previous traffic on the mailing list - please search the archive
63 before asking FAQ's. Please see
64 http://lists.sourceforge.net/lists/listinfo/u-boot-users/
70 - start from 8xxrom sources
71 - create PPCBoot project (http://sourceforge.net/projects/ppcboot)
73 - make it easier to add custom boards
74 - make it possible to add other [PowerPC] CPUs
75 - extend functions, especially:
76 * Provide extended interface to Linux boot loader
79 * PCMCIA / CompactFLash / ATA disk / SCSI ... boot
80 - create ARMBoot project (http://sourceforge.net/projects/armboot)
81 - add other CPU families (starting with ARM)
82 - create U-Boot project (http://sourceforge.net/projects/u-boot)
88 The "official" name of this project is "Das U-Boot". The spelling
89 "U-Boot" shall be used in all written text (documentation, comments
90 in source files etc.). Example:
92 This is the README file for the U-Boot project.
94 File names etc. shall be based on the string "u-boot". Examples:
96 include/asm-ppc/u-boot.h
98 #include <asm/u-boot.h>
100 Variable names, preprocessor constants etc. shall be either based on
101 the string "u_boot" or on "U_BOOT". Example:
103 U_BOOT_VERSION u_boot_logo
104 IH_OS_U_BOOT u_boot_hush_start
110 U-Boot uses a 3 level version number containing a version, a
111 sub-version, and a patchlevel: "U-Boot-2.34.5" means version "2",
112 sub-version "34", and patchlevel "4".
114 The patchlevel is used to indicate certain stages of development
115 between released versions, i. e. officially released versions of
116 U-Boot will always have a patchlevel of "0".
122 - board Board dependend files
123 - common Misc architecture independend functions
124 - cpu CPU specific files
125 - disk Code for disk drive partition handling
126 - doc Documentation (don't expect too much)
127 - drivers Common used device drivers
128 - dtt Digital Thermometer and Thermostat drivers
129 - examples Example code for standalone applications, etc.
130 - include Header Files
131 - disk Harddisk interface code
132 - net Networking code
133 - ppc Files generic to PowerPC architecture
134 - post Power On Self Test
135 - post/arch Symlink to architecture specific Power On Self Test
136 - post/arch-ppc PowerPC architecture specific Power On Self Test
137 - post/cpu/mpc8260 MPC8260 CPU specific Power On Self Test
138 - post/cpu/mpc8xx MPC8xx CPU specific Power On Self Test
139 - rtc Real Time Clock drivers
140 - tools Tools to build S-Record or U-Boot images, etc.
142 - cpu/74xx_7xx Files specific to Motorola MPC74xx and 7xx CPUs
143 - cpu/mpc5xx Files specific to Motorola MPC5xx CPUs
144 - cpu/mpc8xx Files specific to Motorola MPC8xx CPUs
145 - cpu/mpc824x Files specific to Motorola MPC824x CPUs
146 - cpu/mpc8260 Files specific to Motorola MPC8260 CPU
147 - cpu/ppc4xx Files specific to IBM 4xx CPUs
149 - board/LEOX/ Files specific to boards manufactured by The LEOX team
150 - board/LEOX/elpt860 Files specific to ELPT860 boards
152 Files specific to RPXClassic boards
153 - board/RPXlite Files specific to RPXlite boards
154 - board/c2mon Files specific to c2mon boards
155 - board/cmi Files specific to cmi boards
156 - board/cogent Files specific to Cogent boards
157 (need further configuration)
158 Files specific to CPCIISER4 boards
159 - board/cpu86 Files specific to CPU86 boards
160 - board/cray/ Files specific to boards manufactured by Cray
161 - board/cray/L1 Files specific to L1 boards
162 - board/cu824 Files specific to CU824 boards
163 - board/ebony Files specific to IBM Ebony board
164 - board/eric Files specific to ERIC boards
165 - board/esd/ Files specific to boards manufactured by ESD
166 - board/esd/adciop Files specific to ADCIOP boards
167 - board/esd/ar405 Files specific to AR405 boards
168 - board/esd/canbt Files specific to CANBT boards
169 - board/esd/cpci405 Files specific to CPCI405 boards
170 - board/esd/cpciiser4 Files specific to CPCIISER4 boards
171 - board/esd/common Common files for ESD boards
172 - board/esd/dasa_sim Files specific to DASA_SIM boards
173 - board/esd/du405 Files specific to DU405 boards
174 - board/esd/ocrtc Files specific to OCRTC boards
175 - board/esd/pci405 Files specific to PCI405 boards
177 Files specific to ESTEEM192E boards
178 - board/etx094 Files specific to ETX_094 boards
180 Files specific to EVB64260 boards
181 - board/fads Files specific to FADS boards
182 - board/flagadm Files specific to FLAGADM boards
183 - board/gen860t Files specific to GEN860T boards
184 - board/genietv Files specific to GENIETV boards
185 - board/gth Files specific to GTH boards
186 - board/hermes Files specific to HERMES boards
187 - board/hymod Files specific to HYMOD boards
188 - board/icu862 Files specific to ICU862 boards
189 - board/ip860 Files specific to IP860 boards
191 Files specific to Interphase4539 boards
192 - board/ivm Files specific to IVMS8/IVML24 boards
193 - board/lantec Files specific to LANTEC boards
194 - board/lwmon Files specific to LWMON boards
195 - board/mbx8xx Files specific to MBX boards
197 Files specific to MMPC8260ADS boards
198 - board/mpl/ Files specific to boards manufactured by MPL
199 - board/mpl/common Common files for MPL boards
200 - board/mpl/pip405 Files specific to PIP405 boards
201 - board/mpl/mip405 Files specific to MIP405 boards
202 - board/musenki Files specific to MUSEKNI boards
203 - board/mvs1 Files specific to MVS1 boards
204 - board/nx823 Files specific to NX823 boards
205 - board/oxc Files specific to OXC boards
206 - board/pcippc2 Files specific to PCIPPC2/PCIPPC6 boards
207 - board/pm826 Files specific to PM826 boards
209 Files specific to PPMC8260 boards
211 Files specific to RPXsuper boards
213 Files specific to RSDproto boards
215 Files specific to Sandpoint boards
216 - board/sbc8260 Files specific to SBC8260 boards
217 - board/sacsng Files specific to SACSng boards
218 - board/siemens Files specific to boards manufactured by Siemens AG
219 - board/siemens/CCM Files specific to CCM boards
220 - board/siemens/IAD210 Files specific to IAD210 boards
221 - board/siemens/SCM Files specific to SCM boards
222 - board/siemens/pcu_e Files specific to PCU_E boards
223 - board/sixnet Files specific to SIXNET boards
224 - board/spd8xx Files specific to SPD8xxTS boards
225 - board/tqm8260 Files specific to TQM8260 boards
226 - board/tqm8xx Files specific to TQM8xxL boards
227 - board/w7o Files specific to W7O boards
229 Files specific to Walnut405 boards
230 - board/westel/ Files specific to boards manufactured by Westel Wireless
231 - board/westel/amx860 Files specific to AMX860 boards
232 - board/utx8245 Files specific to UTX8245 boards
234 Software Configuration:
235 =======================
237 Configuration is usually done using C preprocessor defines; the
238 rationale behind that is to avoid dead code whenever possible.
240 There are two classes of configuration variables:
242 * Configuration _OPTIONS_:
243 These are selectable by the user and have names beginning with
246 * Configuration _SETTINGS_:
247 These depend on the hardware etc. and should not be meddled with if
248 you don't know what you're doing; they have names beginning with
251 Later we will add a configuration tool - probably similar to or even
252 identical to what's used for the Linux kernel. Right now, we have to
253 do the configuration by hand, which means creating some symbolic
254 links and editing some configuration files. We use the TQM8xxL boards
258 Selection of Processor Architecture and Board Type:
259 ---------------------------------------------------
261 For all supported boards there are ready-to-use default
262 configurations available; just type "make <board_name>_config".
264 Example: For a TQM823L module type:
269 For the Cogent platform, you need to specify the cpu type as well;
270 e.g. "make cogent_mpc8xx_config". And also configure the cogent
271 directory according to the instructions in cogent/README.
274 Configuration Options:
275 ----------------------
277 Configuration depends on the combination of board and CPU type; all
278 such information is kept in a configuration file
279 "include/configs/<board_name>.h".
281 Example: For a TQM823L module, all configuration settings are in
282 "include/configs/TQM823L.h".
285 Many of the options are named exactly as the corresponding Linux
286 kernel configuration options. The intention is to make it easier to
287 build a config tool - later.
290 The following options need to be configured:
292 - CPU Type: Define exactly one of
296 CONFIG_MPC823, CONFIG_MPC850, CONFIG_MPC855, CONFIG_MPC860
298 or CONFIG_MPC824X, CONFIG_MPC8260
311 - Board Type: Define exactly one of
313 PowerPC based boards:
314 ---------------------
316 CONFIG_ADCIOP, CONFIG_ICU862 CONFIG_RPXsuper,
317 CONFIG_ADS860, CONFIG_IP860, CONFIG_SM850,
318 CONFIG_AMX860, CONFIG_IPHASE4539, CONFIG_SPD823TS,
319 CONFIG_AR405, CONFIG_IVML24, CONFIG_SXNI855T,
320 CONFIG_BAB7xx, CONFIG_IVML24_128, CONFIG_Sandpoint8240,
321 CONFIG_CANBT, CONFIG_IVML24_256, CONFIG_Sandpoint8245,
322 CONFIG_CCM, CONFIG_IVMS8, CONFIG_TQM823L,
323 CONFIG_CPCI405, CONFIG_IVMS8_128, CONFIG_TQM850L,
324 CONFIG_CPCI4052, CONFIG_IVMS8_256, CONFIG_TQM855L,
325 CONFIG_CPCIISER4, CONFIG_LANTEC, CONFIG_TQM860L,
326 CONFIG_CPU86, CONFIG_MBX, CONFIG_TQM8260,
327 CONFIG_CRAYL1, CONFIG_MBX860T, CONFIG_TTTech,
328 CONFIG_CU824, CONFIG_MHPC, CONFIG_UTX8245,
329 CONFIG_DASA_SIM, CONFIG_MIP405, CONFIG_W7OLMC,
330 CONFIG_DU405, CONFIG_MOUSSE, CONFIG_W7OLMG,
331 CONFIG_ELPPC, CONFIG_MPC8260ADS, CONFIG_WALNUT405,
332 CONFIG_ERIC, CONFIG_MUSENKI, CONFIG_ZUMA,
333 CONFIG_ESTEEM192E, CONFIG_MVS1, CONFIG_c2mon,
334 CONFIG_ETX094, CONFIG_NX823, CONFIG_cogent_mpc8260,
335 CONFIG_EVB64260, CONFIG_OCRTC, CONFIG_cogent_mpc8xx,
336 CONFIG_FADS823, CONFIG_ORSG, CONFIG_ep8260,
337 CONFIG_FADS850SAR, CONFIG_OXC, CONFIG_gw8260,
338 CONFIG_FADS860T, CONFIG_PCI405, CONFIG_hermes,
339 CONFIG_FLAGADM, CONFIG_PCIPPC2, CONFIG_hymod,
340 CONFIG_FPS850L, CONFIG_PCIPPC6, CONFIG_lwmon,
341 CONFIG_GEN860T, CONFIG_PIP405, CONFIG_pcu_e,
342 CONFIG_GENIETV, CONFIG_PM826, CONFIG_ppmc8260,
343 CONFIG_GTH, CONFIG_RPXClassic, CONFIG_rsdproto,
344 CONFIG_IAD210, CONFIG_RPXlite, CONFIG_sbc8260,
345 CONFIG_EBONY, CONFIG_sacsng, CONFIG_FPS860L,
346 CONFIG_V37, CONFIG_ELPT860, CONFIG_CMI
351 CONFIG_HHP_CRADLE, CONFIG_DNP1110, CONFIG_EP7312,
352 CONFIG_IMPA7, CONFIG_LART, CONFIG_LUBBOCK,
353 CONFIG_SHANNON, CONFIG_SMDK2400, CONFIG_SMDK2410,
357 - CPU Module Type: (if CONFIG_COGENT is defined)
358 Define exactly one of
360 --- FIXME --- not tested yet:
361 CONFIG_CMA286_60, CONFIG_CMA286_21, CONFIG_CMA286_60P,
362 CONFIG_CMA287_23, CONFIG_CMA287_50
364 - Motherboard Type: (if CONFIG_COGENT is defined)
365 Define exactly one of
366 CONFIG_CMA101, CONFIG_CMA102
368 - Motherboard I/O Modules: (if CONFIG_COGENT is defined)
369 Define one or more of
372 - Motherboard Options: (if CONFIG_CMA101 or CONFIG_CMA102 are defined)
373 Define one or more of
374 CONFIG_LCD_HEARTBEAT - update a character position on
375 the lcd display every second with
378 - MPC824X Family Member (if CONFIG_MPC824X is defined)
379 Define exactly one of
380 CONFIG_MPC8240, CONFIG_MPC8245
382 - 8xx CPU Options: (if using an 8xx cpu)
383 Define one or more of
384 CONFIG_8xx_GCLK_FREQ - if get_gclk_freq() can not work e.g.
385 no 32KHz reference PIT/RTC clock
390 U-Boot stores all clock information in Hz
391 internally. For binary compatibility with older Linux
392 kernels (which expect the clocks passed in the
393 bd_info data to be in MHz) the environment variable
394 "clocks_in_mhz" can be defined so that U-Boot
395 converts clock data to MHZ before passing it to the
398 When CONFIG_CLOCKS_IN_MHZ is defined, a definition of
399 "clocks_in_mhz=1" is automatically included in the
403 Depending on board, define exactly one serial port
404 (like CONFIG_8xx_CONS_SMC1, CONFIG_8xx_CONS_SMC2,
405 CONFIG_8xx_CONS_SCC1, ...), or switch off the serial
406 console by defining CONFIG_8xx_CONS_NONE
408 Note: if CONFIG_8xx_CONS_NONE is defined, the serial
409 port routines must be defined elsewhere
410 (i.e. serial_init(), serial_getc(), ...)
413 Enables console device for a color framebuffer. Needs following
414 defines (cf. smiLynxEM, i8042, board/eltec/bab7xx)
415 VIDEO_FB_LITTLE_ENDIAN graphic memory organisation
417 VIDEO_HW_RECTFILL graphic chip supports
420 VIDEO_HW_BITBLT graphic chip supports
421 bit-blit (cf. smiLynxEM)
422 VIDEO_VISIBLE_COLS visible pixel columns
424 VIDEO_VISIBLE_ROWS visible pixel rows
425 VIDEO_PIXEL_SIZE bytes per pixel
426 VIDEO_DATA_FORMAT graphic data format
427 (0-5, cf. cfb_console.c)
428 VIDEO_FB_ADRS framebuffer address
429 VIDEO_KBD_INIT_FCT keyboard int fct
430 (i.e. i8042_kbd_init())
431 VIDEO_TSTC_FCT test char fct
433 VIDEO_GETC_FCT get char fct
435 CONFIG_CONSOLE_CURSOR cursor drawing on/off
436 (requires blink timer
438 CFG_CONSOLE_BLINK_COUNT blink interval (cf. i8042.c)
439 CONFIG_CONSOLE_TIME display time/date info in
441 (requires CFG_CMD_DATE)
442 CONFIG_VIDEO_LOGO display Linux logo in
444 CONFIG_VIDEO_BMP_LOGO use bmp_logo.h instead of
445 linux_logo.h for logo.
446 Requires CONFIG_VIDEO_LOGO
447 CONFIG_CONSOLE_EXTRA_INFO
448 addional board info beside
451 When CONFIG_CFB_CONSOLE is defined, video console is
452 default i/o. Serial console can be forced with
453 environment 'console=serial'.
456 CONFIG_BAUDRATE - in bps
457 Select one of the baudrates listed in
458 CFG_BAUDRATE_TABLE, see below.
460 - Interrupt driven serial port input:
461 CONFIG_SERIAL_SOFTWARE_FIFO
464 Use an interrupt handler for receiving data on the
465 serial port. It also enables using hardware handshake
466 (RTS/CTS) and UART's built-in FIFO. Set the number of
467 bytes the interrupt driven input buffer should have.
469 Set to 0 to disable this feature (this is the default).
470 This will also disable hardware handshake.
472 - Boot Delay: CONFIG_BOOTDELAY - in seconds
473 Delay before automatically booting the default image;
474 set to -1 to disable autoboot.
476 See doc/README.autoboot for these options that
477 work with CONFIG_BOOTDELAY. None are required.
478 CONFIG_BOOT_RETRY_TIME
479 CONFIG_BOOT_RETRY_MIN
480 CONFIG_AUTOBOOT_KEYED
481 CONFIG_AUTOBOOT_PROMPT
482 CONFIG_AUTOBOOT_DELAY_STR
483 CONFIG_AUTOBOOT_STOP_STR
484 CONFIG_AUTOBOOT_DELAY_STR2
485 CONFIG_AUTOBOOT_STOP_STR2
486 CONFIG_ZERO_BOOTDELAY_CHECK
487 CONFIG_RESET_TO_RETRY
491 Only needed when CONFIG_BOOTDELAY is enabled;
492 define a command string that is automatically executed
493 when no character is read on the console interface
494 within "Boot Delay" after reset.
497 This can be used to pass arguments to the bootm
498 command. The value of CONFIG_BOOTARGS goes into the
499 environment value "bootargs".
501 CONFIG_RAMBOOT and CONFIG_NFSBOOT
502 The value of these goes into the environment as
503 "ramboot" and "nfsboot" respectively, and can be used
504 as a convenience, when switching between booting from
510 When this option is #defined, the existence of the
511 environment variable "preboot" will be checked
512 immediately before starting the CONFIG_BOOTDELAY
513 countdown and/or running the auto-boot command resp.
514 entering interactive mode.
516 This feature is especially useful when "preboot" is
517 automatically generated or modified. For an example
518 see the LWMON board specific code: here "preboot" is
519 modified when the user holds down a certain
520 combination of keys on the (special) keyboard when
523 - Serial Download Echo Mode:
525 If defined to 1, all characters received during a
526 serial download (using the "loads" command) are
527 echoed back. This might be needed by some terminal
528 emulations (like "cu"), but may as well just take
529 time on others. This setting #define's the initial
530 value of the "loads_echo" environment variable.
532 - Kgdb Serial Baudrate: (if CFG_CMD_KGDB is defined)
534 Select one of the baudrates listed in
535 CFG_BAUDRATE_TABLE, see below.
539 Most monitor functions can be selected (or
540 de-selected) by adjusting the definition of
541 CONFIG_COMMANDS; to select individual functions,
542 #define CONFIG_COMMANDS by "OR"ing any of the
545 #define enables commands:
546 -------------------------
547 CFG_CMD_ASKENV * ask for env variable
549 CFG_CMD_BEDBUG Include BedBug Debugger
551 CFG_CMD_CACHE icache, dcache
552 CFG_CMD_CONSOLE coninfo
553 CFG_CMD_DATE * support for RTC, date/time...
554 CFG_CMD_DHCP DHCP support
555 CFG_CMD_ECHO * echo arguments
556 CFG_CMD_EEPROM * EEPROM read/write support
557 CFG_CMD_ELF bootelf, bootvx
559 CFG_CMD_FDC * Floppy Disk Support
560 CFG_CMD_FDOS * Dos diskette Support
561 CFG_CMD_FLASH flinfo, erase, protect
562 CFG_CMD_FPGA FPGA device initialization support
563 CFG_CMD_I2C * I2C serial bus support
564 CFG_CMD_IDE * IDE harddisk support
566 CFG_CMD_IMMAP * IMMR dump support
567 CFG_CMD_IRQ * irqinfo
571 CFG_CMD_MEMORY md, mm, nm, mw, cp, cmp, crc, base,
573 CFG_CMD_MII MII utility commands
574 CFG_CMD_NET bootp, tftpboot, rarpboot
575 CFG_CMD_PCI * pciinfo
576 CFG_CMD_PCMCIA * PCMCIA support
577 CFG_CMD_REGINFO * Register dump
578 CFG_CMD_RUN run command in env variable
579 CFG_CMD_SCSI * SCSI Support
580 CFG_CMD_SETGETDCR Support for DCR Register access (4xx only)
581 CFG_CMD_SPI * SPI serial bus support
582 CFG_CMD_USB * USB support
583 CFG_CMD_BSP * Board SPecific functions
584 -----------------------------------------------
587 CFG_CMD_DFL Default configuration; at the moment
588 this is includes all commands, except
589 the ones marked with "*" in the list
592 If you don't define CONFIG_COMMANDS it defaults to
593 CFG_CMD_DFL in include/cmd_confdefs.h. A board can
594 override the default settings in the respective
597 EXAMPLE: If you want all functions except of network
598 support you can write:
600 #define CONFIG_COMMANDS (CFG_CMD_ALL & ~CFG_CMD_NET)
603 Note: Don't enable the "icache" and "dcache" commands
604 (configuration option CFG_CMD_CACHE) unless you know
605 what you (and your U-Boot users) are doing. Data
606 cache cannot be enabled on systems like the 8xx or
607 8260 (where accesses to the IMMR region must be
608 uncached), and it cannot be disabled on all other
609 systems where we (mis-) use the data cache to hold an
610 initial stack and some data.
613 XXX - this list needs to get updated!
617 If this variable is defined, it enables watchdog
618 support. There must support in the platform specific
619 code for a watchdog. For the 8xx and 8260 CPUs, the
620 SIU Watchdog feature is enabled in the SYPCR
624 CONFIG_VERSION_VARIABLE
625 If this variable is defined, an environment variable
626 named "ver" is created by U-Boot showing the U-Boot
627 version as printed by the "version" command.
628 This variable is readonly.
632 When CFG_CMD_DATE is selected, the type of the RTC
633 has to be selected, too. Define exactly one of the
636 CONFIG_RTC_MPC8xx - use internal RTC of MPC8xx
637 CONFIG_RTC_PCF8563 - use Philips PCF8563 RTC
638 CONFIG_RTC_MC146818 - use MC146818 RTC
639 CONFIG_RTC_DS1307 - use Maxim, Inc. DS1307 RTC
640 CONFIG_RTC_DS1337 - use Maxim, Inc. DS1337 RTC
641 CONFIG_RTC_DS164x - use Dallas DS164x RTC
645 When CONFIG_TIMESTAMP is selected, the timestamp
646 (date and time) of an image is printed by image
647 commands like bootm or iminfo. This option is
648 automatically enabled when you select CFG_CMD_DATE .
651 CONFIG_MAC_PARTITION and/or CONFIG_DOS_PARTITION
652 and/or CONFIG_ISO_PARTITION
654 If IDE or SCSI support is enabled (CFG_CMD_IDE or
655 CFG_CMD_SCSI) you must configure support for at least
656 one partition type as well.
659 CONFIG_IDE_RESET_ROUTINE
661 Set this to define that instead of a reset Pin, the
662 routine ide_set_reset(int idereset) will be used.
667 Set this to enable ATAPI support.
670 At the moment only there is only support for the
671 SYM53C8XX SCSI controller; define
672 CONFIG_SCSI_SYM53C8XX to enable it.
674 CFG_SCSI_MAX_LUN [8], CFG_SCSI_MAX_SCSI_ID [7] and
675 CFG_SCSI_MAX_DEVICE [CFG_SCSI_MAX_SCSI_ID *
676 CFG_SCSI_MAX_LUN] can be adjusted to define the
677 maximum numbers of LUNs, SCSI ID's and target
679 CFG_SCSI_SYM53C8XX_CCF to fix clock timing (80Mhz)
681 - NETWORK Support (PCI):
683 Support for Intel 82557/82559/82559ER chips.
684 Optional CONFIG_EEPRO100_SROM_WRITE enables eeprom
685 write routine for first time initialisation.
688 Support for Digital 2114x chips.
689 Optional CONFIG_TULIP_SELECT_MEDIA for board specific
690 modem chip initialisation (KS8761/QS6611).
693 Support for National dp83815 chips.
696 Support for National dp8382[01] gigabit chips.
699 At the moment only the UHCI host controller is
700 supported (PIP405, MIP405); define
701 CONFIG_USB_UHCI to enable it.
702 define CONFIG_USB_KEYBOARD to enable the USB Keyboard
703 end define CONFIG_USB_STORAGE to enable the USB
706 Supported are USB Keyboards and USB Floppy drives
712 Define this to enable standard (PC-Style) keyboard
716 Standard PC keyboard driver with US (is default) and
717 GERMAN key layout (switch via environment 'keymap=de') support.
718 Export function i8042_kbd_init, i8042_tstc and i8042_getc
719 for cfb_console. Supports cursor blinking.
724 Define this to enable video support (for output to
729 Enable Chips & Technologies 69000 Video chip
731 CONFIG_VIDEO_SMI_LYNXEM
732 Enable Silicon Motion SMI 712/710/810 Video chip
733 Videomode are selected via environment 'videomode' with
734 standard LiLo mode numbers.
735 Following modes are supported (* is default):
737 800x600 1024x768 1280x1024
738 256 (8bit) 303* 305 307
739 65536 (16bit) 314 317 31a
740 16,7 Mill (24bit) 315 318 31b
741 (i.e. setenv videomode 317; saveenv; reset;)
743 CONFIG_VIDEO_SED13806
744 Enable Epson SED13806 driver. This driver supports 8bpp
745 and 16bpp modes defined by CONFIG_VIDEO_SED13806_8BPP
746 or CONFIG_VIDEO_SED13806_16BPP
749 - LCD Support: CONFIG_LCD
751 Define this to enable LCD support (for output to LCD
752 display); also select one of the supported displays
753 by defining one of these:
755 CONFIG_NEC_NL6648AC33:
757 NEC NL6648AC33-18. Active, color, single scan.
759 CONFIG_NEC_NL6648BC20
761 NEC NL6648BC20-08. 6.5", 640x480.
762 Active, color, single scan.
766 Sharp 320x240. Active, color, single scan.
767 It isn't 16x9, and I am not sure what it is.
769 CONFIG_SHARP_LQ64D341
771 Sharp LQ64D341 display, 640x480.
772 Active, color, single scan.
776 HLD1045 display, 640x480.
777 Active, color, single scan.
781 Optrex CBL50840-2 NF-FW 99 22 M5
783 Hitachi LMG6912RPFC-00T
787 320x240. Black & white.
789 Normally display is black on white background; define
790 CFG_WHITE_ON_BLACK to get it inverted.
797 Define a default value for ethernet address to use
798 for the respective ethernet interface, in case this
799 is not determined automatically.
804 Define a default value for the IP address to use for
805 the default ethernet interface, in case this is not
806 determined through e.g. bootp.
811 Defines a default value for theIP address of a TFTP
812 server to contact when using the "tftboot" command.
814 - BOOTP Recovery Mode:
815 CONFIG_BOOTP_RANDOM_DELAY
817 If you have many targets in a network that try to
818 boot using BOOTP, you may want to avoid that all
819 systems send out BOOTP requests at precisely the same
820 moment (which would happen for instance at recovery
821 from a power failure, when all systems will try to
822 boot, thus flooding the BOOTP server. Defining
823 CONFIG_BOOTP_RANDOM_DELAY causes a random delay to be
824 inserted before sending out BOOTP requests. The
825 following delays are insterted then:
827 1st BOOTP request: delay 0 ... 1 sec
828 2nd BOOTP request: delay 0 ... 2 sec
829 3rd BOOTP request: delay 0 ... 4 sec
831 BOOTP requests: delay 0 ... 8 sec
833 - Status LED: CONFIG_STATUS_LED
835 Several configurations allow to display the current
836 status using a LED. For instance, the LED will blink
837 fast while running U-Boot code, stop blinking as
838 soon as a reply to a BOOTP request was received, and
839 start blinking slow once the Linux kernel is running
840 (supported by a status LED driver in the Linux
841 kernel). Defining CONFIG_STATUS_LED enables this
844 - CAN Support: CONFIG_CAN_DRIVER
846 Defining CONFIG_CAN_DRIVER enables CAN driver support
847 on those systems that support this (optional)
848 feature, like the TQM8xxL modules.
850 - I2C Support: CONFIG_HARD_I2C | CONFIG_SOFT_I2C
852 Enables I2C serial bus commands. If this is selected,
853 either CONFIG_HARD_I2C or CONFIG_SOFT_I2C must be defined
854 to include the appropriate I2C driver.
856 See also: common/cmd_i2c.c for a description of the
857 command line interface.
862 Selects the CPM hardware driver for I2C.
866 Use software (aka bit-banging) driver instead of CPM
867 or similar hardware support for I2C. This is configured
868 via the following defines.
872 (Optional). Any commands necessary to enable I2C
873 controller or configure ports.
877 (Only for MPC8260 CPU). The I/O port to use (the code
878 assumes both bits are on the same port). Valid values
879 are 0..3 for ports A..D.
883 The code necessary to make the I2C data line active
884 (driven). If the data line is open collector, this
889 The code necessary to make the I2C data line tri-stated
890 (inactive). If the data line is open collector, this
895 Code that returns TRUE if the I2C data line is high,
900 If <bit> is TRUE, sets the I2C data line high. If it
901 is FALSE, it clears it (low).
905 If <bit> is TRUE, sets the I2C clock line high. If it
906 is FALSE, it clears it (low).
910 This delay is invoked four times per clock cycle so this
911 controls the rate of data transfer. The data rate thus
912 is 1 / (I2C_DELAY * 4).
916 When a board is reset during an i2c bus transfer
917 chips might think that the current transfer is still
918 in progress. On some boards it is possible to access
919 the i2c SCLK line directly, either by using the
920 processor pin as a GPIO or by having a second pin
921 connected to the bus. If this option is defined a
922 custom i2c_init_board() routine in boards/xxx/board.c
923 is run early in the boot sequence.
925 - SPI Support: CONFIG_SPI
927 Enables SPI driver (so far only tested with
928 SPI EEPROM, also an instance works with Crystal A/D and
929 D/As on the SACSng board)
933 Enables extended (16-bit) SPI EEPROM addressing.
934 (symmetrical to CONFIG_I2C_X)
938 Enables a software (bit-bang) SPI driver rather than
939 using hardware support. This is a general purpose
940 driver that only requires three general I/O port pins
941 (two outputs, one input) to function. If this is
942 defined, the board configuration must define several
943 SPI configuration items (port pins to use, etc). For
944 an example, see include/configs/sacsng.h.
946 - FPGA Support: CONFIG_FPGA_COUNT
948 Specify the number of FPGA devices to support.
952 Used to specify the types of FPGA devices. For
954 #define CONFIG_FPGA CFG_XILINX_VIRTEX2
956 CFG_FPGA_PROG_FEEDBACK
958 Enable printing of hash marks during FPGA
963 Enable checks on FPGA configuration interface busy
964 status by the configuration function. This option
965 will require a board or device specific function to
970 If defined, a function that provides delays in the
971 FPGA configuration driver.
975 Allow Control-C to interrupt FPGA configuration
979 Check for configuration errors during FPGA bitfile
980 loading. For example, abort during Virtex II
981 configuration if the INIT_B line goes low (which
982 indicated a CRC error).
986 Maximum time to wait for the INIT_B line to deassert
987 after PROB_B has been deasserted during a Virtex II
988 FPGA configuration sequence. The default time is 500 mS.
992 Maximum time to wait for BUSY to deassert during
993 Virtex II FPGA configuration. The default is 5 mS.
997 Time to wait after FPGA configuration. The default is
1000 - FPGA Support: CONFIG_FPGA_COUNT
1002 Specify the number of FPGA devices to support.
1006 Used to specify the types of FPGA devices. For example,
1007 #define CONFIG_FPGA CFG_XILINX_VIRTEX2
1009 CFG_FPGA_PROG_FEEDBACK
1011 Enable printing of hash marks during FPGA configuration.
1015 Enable checks on FPGA configuration interface busy
1016 status by the configuration function. This option
1017 will require a board or device specific function to
1022 If defined, a function that provides delays in the FPGA
1023 configuration driver.
1025 CFG_FPGA_CHECK_CTRLC
1026 Allow Control-C to interrupt FPGA configuration
1028 CFG_FPGA_CHECK_ERROR
1030 Check for configuration errors during FPGA bitfile
1031 loading. For example, abort during Virtex II
1032 configuration if the INIT_B line goes low (which
1033 indicated a CRC error).
1037 Maximum time to wait for the INIT_B line to deassert
1038 after PROB_B has been deasserted during a Virtex II
1039 FPGA configuration sequence. The default time is 500
1044 Maximum time to wait for BUSY to deassert during
1045 Virtex II FPGA configuration. The default is 5 mS.
1047 CFG_FPGA_WAIT_CONFIG
1049 Time to wait after FPGA configuration. The default is
1052 - Configuration Management:
1055 If defined, this string will be added to the U-Boot
1056 version information (U_BOOT_VERSION)
1058 - Vendor Parameter Protection:
1060 U-Boot considers the values of the environment
1061 variables "serial#" (Board Serial Number) and
1062 "ethaddr" (Ethernet Address) to bb parameters that
1063 are set once by the board vendor / manufacturer, and
1064 protects these variables from casual modification by
1065 the user. Once set, these variables are read-only,
1066 and write or delete attempts are rejected. You can
1067 change this behviour:
1069 If CONFIG_ENV_OVERWRITE is #defined in your config
1070 file, the write protection for vendor parameters is
1071 completely disabled. Anybody can change or delete
1074 Alternatively, if you #define _both_ CONFIG_ETHADDR
1075 _and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default
1076 ethernet address is installed in the environment,
1077 which can be changed exactly ONCE by the user. [The
1078 serial# is unaffected by this, i. e. it remains
1084 Define this variable to enable the reservation of
1085 "protected RAM", i. e. RAM which is not overwritten
1086 by U-Boot. Define CONFIG_PRAM to hold the number of
1087 kB you want to reserve for pRAM. You can overwrite
1088 this default value by defining an environment
1089 variable "pram" to the number of kB you want to
1090 reserve. Note that the board info structure will
1091 still show the full amount of RAM. If pRAM is
1092 reserved, a new environment variable "mem" will
1093 automatically be defined to hold the amount of
1094 remaining RAM in a form that can be passed as boot
1095 argument to Linux, for instance like that:
1097 setenv bootargs ... mem=\$(mem)
1100 This way you can tell Linux not to use this memory,
1101 either, which results in a memory region that will
1102 not be affected by reboots.
1104 *WARNING* If your board configuration uses automatic
1105 detection of the RAM size, you must make sure that
1106 this memory test is non-destructive. So far, the
1107 following board configurations are known to be
1110 ETX094, IVMS8, IVML24, SPD8xx, TQM8xxL,
1111 HERMES, IP860, RPXlite, LWMON, LANTEC,
1112 PCU_E, FLAGADM, TQM8260
1117 Define this variable to stop the system in case of a
1118 fatal error, so that you have to reset it manually.
1119 This is probably NOT a good idea for an embedded
1120 system where you want to system to reboot
1121 automatically as fast as possible, but it may be
1122 useful during development since you can try to debug
1123 the conditions that lead to the situation.
1125 CONFIG_NET_RETRY_COUNT
1127 This variable defines the number of retries for
1128 network operations like ARP, RARP, TFTP, or BOOTP
1129 before giving up the operation. If not defined, a
1130 default value of 5 is used.
1132 - Command Interpreter:
1135 Define this variable to enable the "hush" shell (from
1136 Busybox) as command line interpreter, thus enabling
1137 powerful command line syntax like
1138 if...then...else...fi conditionals or `&&' and '||'
1139 constructs ("shell scripts").
1141 If undefined, you get the old, much simpler behaviour
1142 with a somewhat smaller memory footprint.
1147 This defines the secondary prompt string, which is
1148 printed when the command interpreter needs more input
1149 to complete a command. Usually "> ".
1153 In the current implementation, the local variables
1154 space and global environment variables space are
1155 separated. Local variables are those you define by
1156 simply typing like `name=value'. To access a local
1157 variable later on, you have write `$name' or
1158 `${name}'; variable directly by typing say `$name' at
1161 Global environment variables are those you use
1162 setenv/printenv to work with. To run a command stored
1163 in such a variable, you need to use the run command,
1164 and you must not use the '$' sign to access them.
1166 To store commands and special characters in a
1167 variable, please use double quotation marks
1168 surrounding the whole text of the variable, instead
1169 of the backslashes before semicolons and special
1172 - Default Environment
1173 CONFIG_EXTRA_ENV_SETTINGS
1175 Define this to contain any number of null terminated
1176 strings (variable = value pairs) that will be part of
1177 the default enviroment compiled into the boot image.
1179 For example, place something like this in your
1180 board's config file:
1182 #define CONFIG_EXTRA_ENV_SETTINGS \
1186 Warning: This method is based on knowledge about the
1187 internal format how the environment is stored by the
1188 U-Boot code. This is NOT an official, exported
1189 interface! Although it is unlikely that this format
1190 will change soon, but there is no guarantee either.
1191 You better know what you are doing here.
1193 Note: overly (ab)use of the default environment is
1194 discouraged. Make sure to check other ways to preset
1195 the environment like the autoscript function or the
1198 - Show boot progress
1199 CONFIG_SHOW_BOOT_PROGRESS
1201 Defining this option allows to add some board-
1202 specific code (calling a user-provided function
1203 "show_boot_progress(int)") that enables you to show
1204 the system's boot progress on some display (for
1205 example, some LED's) on your board. At the moment,
1206 the following checkpoints are implemented:
1209 1 common/cmd_bootm.c before attempting to boot an image
1210 -1 common/cmd_bootm.c Image header has bad magic number
1211 2 common/cmd_bootm.c Image header has correct magic number
1212 -2 common/cmd_bootm.c Image header has bad checksum
1213 3 common/cmd_bootm.c Image header has correct checksum
1214 -3 common/cmd_bootm.c Image data has bad checksum
1215 4 common/cmd_bootm.c Image data has correct checksum
1216 -4 common/cmd_bootm.c Image is for unsupported architecture
1217 5 common/cmd_bootm.c Architecture check OK
1218 -5 common/cmd_bootm.c Wrong Image Type (not kernel, multi, standalone)
1219 6 common/cmd_bootm.c Image Type check OK
1220 -6 common/cmd_bootm.c gunzip uncompression error
1221 -7 common/cmd_bootm.c Unimplemented compression type
1222 7 common/cmd_bootm.c Uncompression OK
1223 -8 common/cmd_bootm.c Wrong Image Type (not kernel, multi, standalone)
1224 8 common/cmd_bootm.c Image Type check OK
1225 -9 common/cmd_bootm.c Unsupported OS (not Linux, BSD, VxWorks, QNX)
1226 9 common/cmd_bootm.c Start initial ramdisk verification
1227 -10 common/cmd_bootm.c Ramdisk header has bad magic number
1228 -11 common/cmd_bootm.c Ramdisk header has bad checksum
1229 10 common/cmd_bootm.c Ramdisk header is OK
1230 -12 common/cmd_bootm.c Ramdisk data has bad checksum
1231 11 common/cmd_bootm.c Ramdisk data has correct checksum
1232 12 common/cmd_bootm.c Ramdisk verification complete, start loading
1233 -13 common/cmd_bootm.c Wrong Image Type (not PPC Linux Ramdisk)
1234 13 common/cmd_bootm.c Start multifile image verification
1235 14 common/cmd_bootm.c No initial ramdisk, no multifile, continue.
1236 15 common/cmd_bootm.c All preparation done, transferring control to OS
1238 -1 common/cmd_doc.c Bad usage of "doc" command
1239 -1 common/cmd_doc.c No boot device
1240 -1 common/cmd_doc.c Unknown Chip ID on boot device
1241 -1 common/cmd_doc.c Read Error on boot device
1242 -1 common/cmd_doc.c Image header has bad magic number
1244 -1 common/cmd_ide.c Bad usage of "ide" command
1245 -1 common/cmd_ide.c No boot device
1246 -1 common/cmd_ide.c Unknown boot device
1247 -1 common/cmd_ide.c Unknown partition table
1248 -1 common/cmd_ide.c Invalid partition type
1249 -1 common/cmd_ide.c Read Error on boot device
1250 -1 common/cmd_ide.c Image header has bad magic number
1252 -1 common/cmd_nvedit.c Environment not changable, but has bad CRC
1258 [so far only for SMDK2400 and TRAB boards]
1260 - Modem support endable:
1261 CONFIG_MODEM_SUPPORT
1263 - RTS/CTS Flow control enable:
1266 - Modem debug support:
1267 CONFIG_MODEM_SUPPORT_DEBUG
1269 Enables debugging stuff (char screen[1024], dbg())
1270 for modem support. Useful only with BDI2000.
1274 In the target system modem support is enabled when a
1275 specific key (key combination) is pressed during
1276 power-on. Otherwise U-Boot will boot normally
1277 (autoboot). The key_pressed() fuction is called from
1278 board_init(). Currently key_pressed() is a dummy
1279 function, returning 1 and thus enabling modem
1282 If there are no modem init strings in the
1283 environment, U-Boot proceed to autoboot; the
1284 previous output (banner, info printfs) will be
1287 See also: doc/README.Modem
1292 Configuration Settings:
1293 -----------------------
1295 - CFG_LONGHELP: Defined when you want long help messages included;
1296 undefine this when you're short of memory.
1298 - CFG_PROMPT: This is what U-Boot prints on the console to
1299 prompt for user input.
1301 - CFG_CBSIZE: Buffer size for input from the Console
1303 - CFG_PBSIZE: Buffer size for Console output
1305 - CFG_MAXARGS: max. Number of arguments accepted for monitor commands
1307 - CFG_BARGSIZE: Buffer size for Boot Arguments which are passed to
1308 the application (usually a Linux kernel) when it is
1311 - CFG_BAUDRATE_TABLE:
1312 List of legal baudrate settings for this board.
1314 - CFG_CONSOLE_INFO_QUIET
1315 Suppress display of console information at boot.
1317 - CFG_CONSOLE_IS_IN_ENV
1318 If the board specific function
1319 extern int overwrite_console (void);
1320 returns 1, the stdin, stderr and stdout are switched to the
1321 serial port, else the settings in the environment are used.
1323 - CFG_CONSOLE_OVERWRITE_ROUTINE
1324 Enable the call to overwrite_console().
1326 - CFG_CONSOLE_ENV_OVERWRITE
1327 Enable overwrite of previous console environment settings.
1329 - CFG_MEMTEST_START, CFG_MEMTEST_END:
1330 Begin and End addresses of the area used by the
1334 Enable an alternate, more extensive memory test.
1336 - CFG_TFTP_LOADADDR:
1337 Default load address for network file downloads
1339 - CFG_LOADS_BAUD_CHANGE:
1340 Enable temporary baudrate change while serial download
1343 Physical start address of SDRAM. _Must_ be 0 here.
1346 Physical start address of Motherboard I/O (if using a
1350 Physical start address of Flash memory.
1353 Physical start address of boot monitor code (set by
1354 make config files to be same as the text base address
1355 (TEXT_BASE) used when linking) - same as
1356 CFG_FLASH_BASE when booting from flash.
1359 Size of memory reserved for monitor code
1362 Size of DRAM reserved for malloc() use.
1365 Maximum size of memory mapped by the startup code of
1366 the Linux kernel; all data that must be processed by
1367 the Linux kernel (bd_info, boot arguments, eventually
1368 initrd image) must be put below this limit.
1370 - CFG_MAX_FLASH_BANKS:
1371 Max number of Flash memory banks
1373 - CFG_MAX_FLASH_SECT:
1374 Max number of sectors on a Flash chip
1376 - CFG_FLASH_ERASE_TOUT:
1377 Timeout for Flash erase operations (in ms)
1379 - CFG_FLASH_WRITE_TOUT:
1380 Timeout for Flash write operations (in ms)
1382 - CFG_DIRECT_FLASH_TFTP:
1384 Enable TFTP transfers directly to flash memory;
1385 without this option such a download has to be
1386 performed in two steps: (1) download to RAM, and (2)
1387 copy from RAM to flash.
1389 The two-step approach is usually more reliable, since
1390 you can check if the download worked before you erase
1391 the flash, but in some situations (when sytem RAM is
1392 too limited to allow for a tempory copy of the
1393 downloaded image) this option may be very useful.
1396 Define if the flash driver uses extra elements in the
1397 common flash structure for storing flash geometry
1399 The following definitions that deal with the placement and management
1400 of environment data (variable area); in general, we support the
1401 following configurations:
1403 - CFG_ENV_IS_IN_FLASH:
1405 Define this if the environment is in flash memory.
1407 a) The environment occupies one whole flash sector, which is
1408 "embedded" in the text segment with the U-Boot code. This
1409 happens usually with "bottom boot sector" or "top boot
1410 sector" type flash chips, which have several smaller
1411 sectors at the start or the end. For instance, such a
1412 layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In
1413 such a case you would place the environment in one of the
1414 4 kB sectors - with U-Boot code before and after it. With
1415 "top boot sector" type flash chips, you would put the
1416 environment in one of the last sectors, leaving a gap
1417 between U-Boot and the environment.
1421 Offset of environment data (variable area) to the
1422 beginning of flash memory; for instance, with bottom boot
1423 type flash chips the second sector can be used: the offset
1424 for this sector is given here.
1426 CFG_ENV_OFFSET is used relative to CFG_FLASH_BASE.
1430 This is just another way to specify the start address of
1431 the flash sector containing the environment (instead of
1434 - CFG_ENV_SECT_SIZE:
1436 Size of the sector containing the environment.
1439 b) Sometimes flash chips have few, equal sized, BIG sectors.
1440 In such a case you don't want to spend a whole sector for
1445 If you use this in combination with CFG_ENV_IS_IN_FLASH
1446 and CFG_ENV_SECT_SIZE, you can specify to use only a part
1447 of this flash sector for the environment. This saves
1448 memory for the RAM copy of the environment.
1450 It may also save flash memory if you decide to use this
1451 when your environment is "embedded" within U-Boot code,
1452 since then the remainder of the flash sector could be used
1453 for U-Boot code. It should be pointed out that this is
1454 STRONGLY DISCOURAGED from a robustness point of view:
1455 updating the environment in flash makes it always
1456 necessary to erase the WHOLE sector. If something goes
1457 wrong before the contents has been restored from a copy in
1458 RAM, your target system will be dead.
1460 - CFG_ENV_ADDR_REDUND
1463 These settings describe a second storage area used to hold
1464 a redundand copy of the environment data, so that there is
1465 a valid backup copy in case there is a power failure during
1466 a "saveenv" operation.
1468 BE CAREFUL! Any changes to the flash layout, and some changes to the
1469 source code will make it necessary to adapt <board>/u-boot.lds*
1473 - CFG_ENV_IS_IN_NVRAM:
1475 Define this if you have some non-volatile memory device
1476 (NVRAM, battery buffered SRAM) which you want to use for the
1482 These two #defines are used to determin the memory area you
1483 want to use for environment. It is assumed that this memory
1484 can just be read and written to, without any special
1487 BE CAREFUL! The first access to the environment happens quite early
1488 in U-Boot initalization (when we try to get the setting of for the
1489 console baudrate). You *MUST* have mappend your NVRAM area then, or
1492 Please note that even with NVRAM we still use a copy of the
1493 environment in RAM: we could work on NVRAM directly, but we want to
1494 keep settings there always unmodified except somebody uses "saveenv"
1495 to save the current settings.
1498 - CFG_ENV_IS_IN_EEPROM:
1500 Use this if you have an EEPROM or similar serial access
1501 device and a driver for it.
1506 These two #defines specify the offset and size of the
1507 environment area within the total memory of your EEPROM.
1509 - CFG_I2C_EEPROM_ADDR:
1510 If defined, specified the chip address of the EEPROM device.
1511 The default address is zero.
1513 - CFG_EEPROM_PAGE_WRITE_BITS:
1514 If defined, the number of bits used to address bytes in a
1515 single page in the EEPROM device. A 64 byte page, for example
1516 would require six bits.
1518 - CFG_EEPROM_PAGE_WRITE_DELAY_MS:
1519 If defined, the number of milliseconds to delay between
1520 page writes. The default is zero milliseconds.
1522 - CFG_I2C_EEPROM_ADDR_LEN:
1523 The length in bytes of the EEPROM memory array address. Note
1524 that this is NOT the chip address length!
1527 The size in bytes of the EEPROM device.
1530 - CFG_SPI_INIT_OFFSET
1532 Defines offset to the initial SPI buffer area in DPRAM. The
1533 area is used at an early stage (ROM part) if the environment
1534 is configured to reside in the SPI EEPROM: We need a 520 byte
1535 scratch DPRAM area. It is used between the two initialization
1536 calls (spi_init_f() and spi_init_r()). A value of 0xB00 seems
1537 to be a good choice since it makes it far enough from the
1538 start of the data area as well as from the stack pointer.
1540 Please note that the environment is read-only as long as the monitor
1541 has been relocated to RAM and a RAM copy of the environment has been
1542 created; also, when using EEPROM you will have to use getenv_r()
1543 until then to read environment variables.
1545 The environment is protected by a CRC32 checksum. Before the monitor
1546 is relocated into RAM, as a result of a bad CRC you will be working
1547 with the compiled-in default environment - *silently*!!! [This is
1548 necessary, because the first environment variable we need is the
1549 "baudrate" setting for the console - if we have a bad CRC, we don't
1550 have any device yet where we could complain.]
1552 Note: once the monitor has been relocated, then it will complain if
1553 the default environment is used; a new CRC is computed as soon as you
1554 use the "saveenv" command to store a valid environment.
1557 Low Level (hardware related) configuration options:
1558 ---------------------------------------------------
1560 - CFG_CACHELINE_SIZE:
1561 Cache Line Size of the CPU.
1564 Default address of the IMMR after system reset.
1565 Needed on some 8260 systems (MPC8260ADS and RPXsuper)
1566 to be able to adjust the position of the IMMR
1567 register after a reset.
1569 - Floppy Disk Support:
1570 CFG_FDC_DRIVE_NUMBER
1572 the default drive number (default value 0)
1576 defines the spacing between fdc chipset registers
1581 defines the offset of register from address. It
1582 depends on which part of the data bus is connected to
1583 the fdc chipset. (default value 0)
1585 If CFG_ISA_IO_STRIDE CFG_ISA_IO_OFFSET and
1586 CFG_FDC_DRIVE_NUMBER are undefined, they take their
1589 if CFG_FDC_HW_INIT is defined, then the function
1590 fdc_hw_init() is called at the beginning of the FDC
1591 setup. fdc_hw_init() must be provided by the board
1592 source code. It is used to make hardware dependant
1595 - CFG_IMMR: Physical address of the Internal Memory Mapped
1596 Register; DO NOT CHANGE! (11-4)
1597 [MPC8xx systems only]
1599 - CFG_INIT_RAM_ADDR:
1601 Start address of memory area tha can be used for
1602 initial data and stack; please note that this must be
1603 writable memory that is working WITHOUT special
1604 initialization, i. e. you CANNOT use normal RAM which
1605 will become available only after programming the
1606 memory controller and running certain initialization
1609 U-Boot uses the following memory types:
1610 - MPC8xx and MPC8260: IMMR (internal memory of the CPU)
1611 - MPC824X: data cache
1612 - PPC4xx: data cache
1614 - CFG_GBL_DATA_OFFSET:
1616 Offset of the initial data structure in the memory
1617 area defined by CFG_INIT_RAM_ADDR. Usually
1618 CFG_GBL_DATA_OFFSET is chosen such that the initial
1619 data is located at the end of the available space
1620 (sometimes written as (CFG_INIT_RAM_END -
1621 CFG_INIT_DATA_SIZE), and the initial stack is just
1622 below that area (growing from (CFG_INIT_RAM_ADDR +
1623 CFG_GBL_DATA_OFFSET) downward.
1626 On the MPC824X (or other systems that use the data
1627 cache for initial memory) the address chosen for
1628 CFG_INIT_RAM_ADDR is basically arbitrary - it must
1629 point to an otherwise UNUSED address space between
1630 the top of RAM and the start of the PCI space.
1632 - CFG_SIUMCR: SIU Module Configuration (11-6)
1634 - CFG_SYPCR: System Protection Control (11-9)
1636 - CFG_TBSCR: Time Base Status and Control (11-26)
1638 - CFG_PISCR: Periodic Interrupt Status and Control (11-31)
1640 - CFG_PLPRCR: PLL, Low-Power, and Reset Control Register (15-30)
1642 - CFG_SCCR: System Clock and reset Control Register (15-27)
1644 - CFG_OR_TIMING_SDRAM:
1648 periodic timer for refresh
1650 - CFG_DER: Debug Event Register (37-47)
1652 - FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CFG_REMAP_OR_AM,
1653 CFG_PRELIM_OR_AM, CFG_OR_TIMING_FLASH, CFG_OR0_REMAP,
1654 CFG_OR0_PRELIM, CFG_BR0_PRELIM, CFG_OR1_REMAP, CFG_OR1_PRELIM,
1656 Memory Controller Definitions: BR0/1 and OR0/1 (FLASH)
1658 - SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE,
1659 CFG_OR_TIMING_SDRAM, CFG_OR2_PRELIM, CFG_BR2_PRELIM,
1660 CFG_OR3_PRELIM, CFG_BR3_PRELIM:
1661 Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM)
1663 - CFG_MAMR_PTA, CFG_MPTPR_2BK_4K, CFG_MPTPR_1BK_4K, CFG_MPTPR_2BK_8K,
1664 CFG_MPTPR_1BK_8K, CFG_MAMR_8COL, CFG_MAMR_9COL:
1665 Machine Mode Register and Memory Periodic Timer
1666 Prescaler definitions (SDRAM timing)
1668 - CFG_I2C_UCODE_PATCH, CFG_I2C_DPMEM_OFFSET [0x1FC0]:
1669 enable I2C microcode relocation patch (MPC8xx);
1670 define relocation offset in DPRAM [DSP2]
1672 - CFG_SPI_UCODE_PATCH, CFG_SPI_DPMEM_OFFSET [0x1FC0]:
1673 enable SPI microcode relocation patch (MPC8xx);
1674 define relocation offset in DPRAM [SCC4]
1677 Use OSCM clock mode on MBX8xx board. Be careful,
1678 wrong setting might damage your board. Read
1679 doc/README.MBX before setting this variable!
1681 - CFG_CPM_POST_WORD_ADDR: (MPC8xx, MPC8260 only)
1682 Offset of the bootmode word in DPRAM used by post
1683 (Power On Self Tests). This definition overrides
1684 #define'd default value in commproc.h resp.
1687 Building the Software:
1688 ======================
1690 Building U-Boot has been tested in native PPC environments (on a
1691 PowerBook G3 running LinuxPPC 2000) and in cross environments
1692 (running RedHat 6.x and 7.x Linux on x86, Solaris 2.6 on a SPARC, and
1695 If you are not using a native PPC environment, it is assumed that you
1696 have the GNU cross compiling tools available in your path and named
1697 with a prefix of "powerpc-linux-". If this is not the case, (e.g. if
1698 you are using Monta Vista's Hard Hat Linux CDK 1.2) you must change
1699 the definition of CROSS_COMPILE in Makefile. For HHL on a 4xx CPU,
1702 CROSS_COMPILE = ppc_4xx-
1705 U-Boot is intended to be simple to build. After installing the
1706 sources you must configure U-Boot for one specific board type. This
1711 where "NAME_config" is the name of one of the existing
1712 configurations; the following names are supported:
1714 ADCIOP_config GTH_config TQM850L_config
1715 ADS860_config IP860_config TQM855L_config
1716 AR405_config IVML24_config TQM860L_config
1717 CANBT_config IVMS8_config WALNUT405_config
1718 CPCI405_config LANTEC_config cogent_common_config
1719 CPCIISER4_config MBX_config cogent_mpc8260_config
1720 CU824_config MBX860T_config cogent_mpc8xx_config
1721 ESTEEM192E_config RPXlite_config hermes_config
1722 ETX094_config RPXsuper_config hymod_config
1723 FADS823_config SM850_config lwmon_config
1724 FADS850SAR_config SPD823TS_config pcu_e_config
1725 FADS860T_config SXNI855T_config rsdproto_config
1726 FPS850L_config Sandpoint8240_config sbc8260_config
1727 GENIETV_config TQM823L_config PIP405_config
1728 GEN860T_config EBONY_config FPS860L_config
1729 ELPT860_config cmi_mpc5xx_config
1731 Note: for some board special configuration names may exist; check if
1732 additional information is available from the board vendor; for
1733 instance, the TQM8xxL systems run normally at 50 MHz and use a
1734 SCC for 10baseT ethernet; there are also systems with 80 MHz
1735 CPU clock, and an optional Fast Ethernet module is available
1736 for CPU's with FEC. You can select such additional "features"
1737 when chosing the configuration, i. e.
1740 - will configure for a plain TQM860L, i. e. 50MHz, no FEC
1742 make TQM860L_FEC_config
1743 - will configure for a TQM860L at 50MHz with FEC for ethernet
1745 make TQM860L_80MHz_config
1746 - will configure for a TQM860L at 80 MHz, with normal 10baseT
1749 make TQM860L_FEC_80MHz_config
1750 - will configure for a TQM860L at 80 MHz with FEC for ethernet
1752 make TQM823L_LCD_config
1753 - will configure for a TQM823L with U-Boot console on LCD
1755 make TQM823L_LCD_80MHz_config
1756 - will configure for a TQM823L at 80 MHz with U-Boot console on LCD
1762 Finally, type "make all", and you should get some working U-Boot
1763 images ready for downlod to / installation on your system:
1765 - "u-boot.bin" is a raw binary image
1766 - "u-boot" is an image in ELF binary format
1767 - "u-boot.srec" is in Motorola S-Record format
1770 Please be aware that the Makefiles assume you are using GNU make, so
1771 for instance on NetBSD you might need to use "gmake" instead of
1775 If the system board that you have is not listed, then you will need
1776 to port U-Boot to your hardware platform. To do this, follow these
1779 1. Add a new configuration option for your board to the toplevel
1780 "Makefile" and to the "MAKEALL" script, using the existing
1781 entries as examples. Note that here and at many other places
1782 boards and other names are listed alphabetically sorted. Please
1784 2. Create a new directory to hold your board specific code. Add any
1785 files you need. In your board directory, you will need at least
1786 the "Makefile", a "<board>.c", "flash.c" and "u-boot.lds".
1787 3. Create a new configuration file "include/configs/<board>.h" for
1789 3. If you're porting U-Boot to a new CPU, then also create a new
1790 directory to hold your CPU specific code. Add any files you need.
1791 4. Run "make <board>_config" with your new name.
1792 5. Type "make", and you should get a working "u-boot.srec" file
1793 to be installed on your target system.
1794 6. Debug and solve any problems that might arise.
1795 [Of course, this last step is much harder than it sounds.]
1798 Testing of U-Boot Modifications, Ports to New Hardware, etc.:
1799 ==============================================================
1801 If you have modified U-Boot sources (for instance added a new board
1802 or support for new devices, a new CPU, etc.) you are expected to
1803 provide feedback to the other developers. The feedback normally takes
1804 the form of a "patch", i. e. a context diff against a certain (latest
1805 official or latest in CVS) version of U-Boot sources.
1807 But before you submit such a patch, please verify that your modifi-
1808 cation did not break existing code. At least make sure that *ALL* of
1809 the supported boards compile WITHOUT ANY compiler warnings. To do so,
1810 just run the "MAKEALL" script, which will configure and build U-Boot
1811 for ALL supported system. Be warned, this will take a while. You can
1812 select which (cross) compiler to use py passing a `CROSS_COMPILE'
1813 environment variable to the script, i. e. to use the cross tools from
1814 MontaVista's Hard Hat Linux you can type
1816 CROSS_COMPILE=ppc_8xx- MAKEALL
1818 or to build on a native PowerPC system you can type
1820 CROSS_COMPILE=' ' MAKEALL
1822 See also "U-Boot Porting Guide" below.
1826 Monitor Commands - Overview:
1827 ============================
1829 go - start application at address 'addr'
1830 run - run commands in an environment variable
1831 bootm - boot application image from memory
1832 bootp - boot image via network using BootP/TFTP protocol
1833 tftpboot- boot image via network using TFTP protocol
1834 and env variables "ipaddr" and "serverip"
1835 (and eventually "gatewayip")
1836 rarpboot- boot image via network using RARP/TFTP protocol
1837 diskboot- boot from IDE devicebootd - boot default, i.e., run 'bootcmd'
1838 loads - load S-Record file over serial line
1839 loadb - load binary file over serial line (kermit mode)
1841 mm - memory modify (auto-incrementing)
1842 nm - memory modify (constant address)
1843 mw - memory write (fill)
1845 cmp - memory compare
1846 crc32 - checksum calculation
1847 imd - i2c memory display
1848 imm - i2c memory modify (auto-incrementing)
1849 inm - i2c memory modify (constant address)
1850 imw - i2c memory write (fill)
1851 icrc32 - i2c checksum calculation
1852 iprobe - probe to discover valid I2C chip addresses
1853 iloop - infinite loop on address range
1854 isdram - print SDRAM configuration information
1855 sspi - SPI utility commands
1856 base - print or set address offset
1857 printenv- print environment variables
1858 setenv - set environment variables
1859 saveenv - save environment variables to persistent storage
1860 protect - enable or disable FLASH write protection
1861 erase - erase FLASH memory
1862 flinfo - print FLASH memory information
1863 bdinfo - print Board Info structure
1864 iminfo - print header information for application image
1865 coninfo - print console devices and informations
1866 ide - IDE sub-system
1867 loop - infinite loop on address range
1868 mtest - simple RAM test
1869 icache - enable or disable instruction cache
1870 dcache - enable or disable data cache
1871 reset - Perform RESET of the CPU
1872 echo - echo args to console
1873 version - print monitor version
1874 help - print online help
1875 ? - alias for 'help'
1878 Monitor Commands - Detailed Description:
1879 ========================================
1883 For now: just type "help <command>".
1886 Environment Variables:
1887 ======================
1889 U-Boot supports user configuration using Environment Variables which
1890 can be made persistent by saving to Flash memory.
1892 Environment Variables are set using "setenv", printed using
1893 "printenv", and saved to Flash using "saveenv". Using "setenv"
1894 without a value can be used to delete a variable from the
1895 environment. As long as you don't save the environment you are
1896 working with an in-memory copy. In case the Flash area containing the
1897 environment is erased by accident, a default environment is provided.
1899 Some configuration options can be set using Environment Variables:
1901 baudrate - see CONFIG_BAUDRATE
1903 bootdelay - see CONFIG_BOOTDELAY
1905 bootcmd - see CONFIG_BOOTCOMMAND
1907 bootargs - Boot arguments when booting an RTOS image
1909 bootfile - Name of the image to load with TFTP
1911 autoload - if set to "no" (any string beginning with 'n'),
1912 "bootp" will just load perform a lookup of the
1913 configuration from the BOOTP server, but not try to
1914 load any image using TFTP
1916 autostart - if set to "yes", an image loaded using the "bootp",
1917 "rarpboot", "tftpboot" or "diskboot" commands will
1918 be automatically started (by internally calling
1921 initrd_high - restrict positioning of initrd images:
1922 If this variable is not set, initrd images will be
1923 copied to the highest possible address in RAM; this
1924 is usually what you want since it allows for
1925 maximum initrd size. If for some reason you want to
1926 make sure that the initrd image is loaded below the
1927 CFG_BOOTMAPSZ limit, you can set this environment
1928 variable to a value of "no" or "off" or "0".
1929 Alternatively, you can set it to a maximum upper
1930 address to use (U-Boot will still check that it
1931 does not overwrite the U-Boot stack and data).
1933 For instance, when you have a system with 16 MB
1934 RAM, and want to reseve 4 MB from use by Linux,
1935 you can do this by adding "mem=12M" to the value of
1936 the "bootargs" variable. However, now you must make
1937 sure, that the initrd image is placed in the first
1938 12 MB as well - this can be done with
1940 setenv initrd_high 00c00000
1942 ipaddr - IP address; needed for tftpboot command
1944 loadaddr - Default load address for commands like "bootp",
1945 "rarpboot", "tftpboot", "loadb" or "diskboot"
1947 loads_echo - see CONFIG_LOADS_ECHO
1949 serverip - TFTP server IP address; needed for tftpboot command
1951 bootretry - see CONFIG_BOOT_RETRY_TIME
1953 bootdelaykey - see CONFIG_AUTOBOOT_DELAY_STR
1955 bootstopkey - see CONFIG_AUTOBOOT_STOP_STR
1958 The following environment variables may be used and automatically
1959 updated by the network boot commands ("bootp" and "rarpboot"),
1960 depending the information provided by your boot server:
1962 bootfile - see above
1963 dnsip - IP address of your Domain Name Server
1964 gatewayip - IP address of the Gateway (Router) to use
1965 hostname - Target hostname
1967 netmask - Subnet Mask
1968 rootpath - Pathname of the root filesystem on the NFS server
1969 serverip - see above
1972 There are two special Environment Variables:
1974 serial# - contains hardware identification information such
1975 as type string and/or serial number
1976 ethaddr - Ethernet address
1978 These variables can be set only once (usually during manufacturing of
1979 the board). U-Boot refuses to delete or overwrite these variables
1980 once they have been set once.
1983 Further special Environment Variables:
1985 ver - Contains the U-Boot version string as printed
1986 with the "version" command. This variable is
1987 readonly (see CONFIG_VERSION_VARIABLE).
1990 Please note that changes to some configuration parameters may take
1991 only effect after the next boot (yes, that's just like Windoze :-).
1994 Note for Redundant Ethernet Interfaces:
1995 =======================================
1997 Some boards come with redundand ethernet interfaces; U-Boot supports
1998 such configurations and is capable of automatic selection of a
1999 "working" interface when needed. MAC assignemnt works as follows:
2001 Network interfaces are numbered eth0, eth1, eth2, ... Corresponding
2002 MAC addresses can be stored in the environment as "ethaddr" (=>eth0),
2003 "eth1addr" (=>eth1), "eth2addr", ...
2005 If the network interface stores some valid MAC address (for instance
2006 in SROM), this is used as default address if there is NO correspon-
2007 ding setting in the environment; if the corresponding environment
2008 variable is set, this overrides the settings in the card; that means:
2010 o If the SROM has a valid MAC address, and there is no address in the
2011 environment, the SROM's address is used.
2013 o If there is no valid address in the SROM, and a definition in the
2014 environment exists, then the value from the environment variable is
2017 o If both the SROM and the environment contain a MAC address, and
2018 both addresses are the same, this MAC address is used.
2020 o If both the SROM and the environment contain a MAC address, and the
2021 addresses differ, the value from the environment is used and a
2024 o If neither SROM nor the environment contain a MAC address, an error
2032 The "boot" commands of this monitor operate on "image" files which
2033 can be basicly anything, preceeded by a special header; see the
2034 definitions in include/image.h for details; basicly, the header
2035 defines the following image properties:
2037 * Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD,
2038 4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks,
2040 Currently supported: Linux, NetBSD, VxWorks, QNX).
2041 * Target CPU Architecture (Provisions for Alpha, ARM, Intel x86,
2042 IA64, MIPS, MIPS, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit;
2043 Currently supported: PowerPC).
2044 * Compression Type (Provisions for uncompressed, gzip, bzip2;
2045 Currently supported: uncompressed, gzip).
2051 The header is marked by a special Magic Number, and both the header
2052 and the data portions of the image are secured against corruption by
2059 Although U-Boot should support any OS or standalone application
2060 easily, Linux has always been in the focus during the design of
2063 U-Boot includes many features that so far have been part of some
2064 special "boot loader" code within the Linux kernel. Also, any
2065 "initrd" images to be used are no longer part of one big Linux image;
2066 instead, kernel and "initrd" are separate images. This implementation
2067 serves serveral purposes:
2069 - the same features can be used for other OS or standalone
2070 applications (for instance: using compressed images to reduce the
2071 Flash memory footprint)
2073 - it becomes much easier to port new Linux kernel versions because
2074 lots of low-level, hardware dependend stuff are done by U-Boot
2076 - the same Linux kernel image can now be used with different "initrd"
2077 images; of course this also means that different kernel images can
2078 be run with the same "initrd". This makes testing easier (you don't
2079 have to build a new "zImage.initrd" Linux image when you just
2080 change a file in your "initrd"). Also, a field-upgrade of the
2081 software is easier now.
2087 Porting Linux to U-Boot based systems:
2088 ---------------------------------------
2090 U-Boot cannot save you from doing all the necessary modifications to
2091 configure the Linux device drivers for use with your target hardware
2092 (no, we don't intend to provide a full virtual machine interface to
2095 But now you can ignore ALL boot loader code (in arch/ppc/mbxboot).
2097 Just make sure your machine specific header file (for instance
2098 include/asm-ppc/tqm8xx.h) includes the same definition of the Board
2099 Information structure as we define in include/u-boot.h, and make
2100 sure that your definition of IMAP_ADDR uses the same value as your
2101 U-Boot configuration in CFG_IMMR.
2104 Configuring the Linux kernel:
2105 -----------------------------
2107 No specific requirements for U-Boot. Make sure you have some root
2108 device (initial ramdisk, NFS) for your target system.
2111 Building a Linux Image:
2112 -----------------------
2114 With U-Boot, "normal" build targets like "zImage" or "bzImage" are
2115 not used. If you use recent kernel source, a new build target
2116 "uImage" will exist which automatically builds an image usable by
2117 U-Boot. Most older kernels also have support for a "pImage" target,
2118 which was introduced for our predecessor project PPCBoot and uses a
2119 100% compatible format.
2128 The "uImage" build target uses a special tool (in 'tools/mkimage') to
2129 encapsulate a compressed Linux kernel image with header information,
2130 CRC32 checksum etc. for use with U-Boot. This is what we are doing:
2132 * build a standard "vmlinux" kernel image (in ELF binary format):
2134 * convert the kernel into a raw binary image:
2136 ${CROSS_COMPILE}-objcopy -O binary \
2137 -R .note -R .comment \
2138 -S vmlinux linux.bin
2140 * compress the binary image:
2144 * package compressed binary image for U-Boot:
2146 mkimage -A ppc -O linux -T kernel -C gzip \
2147 -a 0 -e 0 -n "Linux Kernel Image" \
2148 -d linux.bin.gz uImage
2151 The "mkimage" tool can also be used to create ramdisk images for use
2152 with U-Boot, either separated from the Linux kernel image, or
2153 combined into one file. "mkimage" encapsulates the images with a 64
2154 byte header containing information about target architecture,
2155 operating system, image type, compression method, entry points, time
2156 stamp, CRC32 checksums, etc.
2158 "mkimage" can be called in two ways: to verify existing images and
2159 print the header information, or to build new images.
2161 In the first form (with "-l" option) mkimage lists the information
2162 contained in the header of an existing U-Boot image; this includes
2163 checksum verification:
2165 tools/mkimage -l image
2166 -l ==> list image header information
2168 The second form (with "-d" option) is used to build a U-Boot image
2169 from a "data file" which is used as image payload:
2171 tools/mkimage -A arch -O os -T type -C comp -a addr -e ep \
2172 -n name -d data_file image
2173 -A ==> set architecture to 'arch'
2174 -O ==> set operating system to 'os'
2175 -T ==> set image type to 'type'
2176 -C ==> set compression type 'comp'
2177 -a ==> set load address to 'addr' (hex)
2178 -e ==> set entry point to 'ep' (hex)
2179 -n ==> set image name to 'name'
2180 -d ==> use image data from 'datafile'
2182 Right now, all Linux kernels use the same load address (0x00000000),
2183 but the entry point address depends on the kernel version:
2185 - 2.2.x kernels have the entry point at 0x0000000C,
2186 - 2.3.x and later kernels have the entry point at 0x00000000.
2188 So a typical call to build a U-Boot image would read:
2190 -> tools/mkimage -n '2.4.4 kernel for TQM850L' \
2191 > -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \
2192 > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/ppc/coffboot/vmlinux.gz \
2193 > examples/uImage.TQM850L
2194 Image Name: 2.4.4 kernel for TQM850L
2195 Created: Wed Jul 19 02:34:59 2000
2196 Image Type: PowerPC Linux Kernel Image (gzip compressed)
2197 Data Size: 335725 Bytes = 327.86 kB = 0.32 MB
2198 Load Address: 0x00000000
2199 Entry Point: 0x00000000
2201 To verify the contents of the image (or check for corruption):
2203 -> tools/mkimage -l examples/uImage.TQM850L
2204 Image Name: 2.4.4 kernel for TQM850L
2205 Created: Wed Jul 19 02:34:59 2000
2206 Image Type: PowerPC Linux Kernel Image (gzip compressed)
2207 Data Size: 335725 Bytes = 327.86 kB = 0.32 MB
2208 Load Address: 0x00000000
2209 Entry Point: 0x00000000
2211 NOTE: for embedded systems where boot time is critical you can trade
2212 speed for memory and install an UNCOMPRESSED image instead: this
2213 needs more space in Flash, but boots much faster since it does not
2214 need to be uncompressed:
2216 -> gunzip /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/ppc/coffboot/vmlinux.gz
2217 -> tools/mkimage -n '2.4.4 kernel for TQM850L' \
2218 > -A ppc -O linux -T kernel -C none -a 0 -e 0 \
2219 > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/ppc/coffboot/vmlinux \
2220 > examples/uImage.TQM850L-uncompressed
2221 Image Name: 2.4.4 kernel for TQM850L
2222 Created: Wed Jul 19 02:34:59 2000
2223 Image Type: PowerPC Linux Kernel Image (uncompressed)
2224 Data Size: 792160 Bytes = 773.59 kB = 0.76 MB
2225 Load Address: 0x00000000
2226 Entry Point: 0x00000000
2229 Similar you can build U-Boot images from a 'ramdisk.image.gz' file
2230 when your kernel is intended to use an initial ramdisk:
2232 -> tools/mkimage -n 'Simple Ramdisk Image' \
2233 > -A ppc -O linux -T ramdisk -C gzip \
2234 > -d /LinuxPPC/images/SIMPLE-ramdisk.image.gz examples/simple-initrd
2235 Image Name: Simple Ramdisk Image
2236 Created: Wed Jan 12 14:01:50 2000
2237 Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
2238 Data Size: 566530 Bytes = 553.25 kB = 0.54 MB
2239 Load Address: 0x00000000
2240 Entry Point: 0x00000000
2243 Installing a Linux Image:
2244 -------------------------
2246 To downloading a U-Boot image over the serial (console) interface,
2247 you must convert the image to S-Record format:
2249 objcopy -I binary -O srec examples/image examples/image.srec
2251 The 'objcopy' does not understand the information in the U-Boot
2252 image header, so the resulting S-Record file will be relative to
2253 address 0x00000000. To load it to a given address, you need to
2254 specify the target address as 'offset' parameter with the 'loads'
2257 Example: install the image to address 0x40100000 (which on the
2258 TQM8xxL is in the first Flash bank):
2260 => erase 40100000 401FFFFF
2266 ## Ready for S-Record download ...
2267 ~>examples/image.srec
2268 1 2 3 4 5 6 7 8 9 10 11 12 13 ...
2270 15989 15990 15991 15992
2271 [file transfer complete]
2273 ## Start Addr = 0x00000000
2276 You can check the success of the download using the 'iminfo' command;
2277 this includes a checksum verification so you can be sure no data
2278 corruption happened:
2282 ## Checking Image at 40100000 ...
2283 Image Name: 2.2.13 for initrd on TQM850L
2284 Image Type: PowerPC Linux Kernel Image (gzip compressed)
2285 Data Size: 335725 Bytes = 327 kB = 0 MB
2286 Load Address: 00000000
2287 Entry Point: 0000000c
2288 Verifying Checksum ... OK
2295 The "bootm" command is used to boot an application that is stored in
2296 memory (RAM or Flash). In case of a Linux kernel image, the contents
2297 of the "bootargs" environment variable is passed to the kernel as
2298 parameters. You can check and modify this variable using the
2299 "printenv" and "setenv" commands:
2302 => printenv bootargs
2303 bootargs=root=/dev/ram
2305 => setenv bootargs root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
2307 => printenv bootargs
2308 bootargs=root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
2311 ## Booting Linux kernel at 40020000 ...
2312 Image Name: 2.2.13 for NFS on TQM850L
2313 Image Type: PowerPC Linux Kernel Image (gzip compressed)
2314 Data Size: 381681 Bytes = 372 kB = 0 MB
2315 Load Address: 00000000
2316 Entry Point: 0000000c
2317 Verifying Checksum ... OK
2318 Uncompressing Kernel Image ... OK
2319 Linux version 2.2.13 (
[email protected]) (gcc version 2.95.2 19991024 (release)) #1 Wed Jul 19 02:35:17 MEST 2000
2320 Boot arguments: root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
2321 time_init: decrementer frequency = 187500000/60
2322 Calibrating delay loop... 49.77 BogoMIPS
2323 Memory: 15208k available (700k kernel code, 444k data, 32k init) [c0000000,c1000000]
2326 If you want to boot a Linux kernel with initial ram disk, you pass
2327 the memory addreses of both the kernel and the initrd image (PPBCOOT
2328 format!) to the "bootm" command:
2330 => imi 40100000 40200000
2332 ## Checking Image at 40100000 ...
2333 Image Name: 2.2.13 for initrd on TQM850L
2334 Image Type: PowerPC Linux Kernel Image (gzip compressed)
2335 Data Size: 335725 Bytes = 327 kB = 0 MB
2336 Load Address: 00000000
2337 Entry Point: 0000000c
2338 Verifying Checksum ... OK
2340 ## Checking Image at 40200000 ...
2341 Image Name: Simple Ramdisk Image
2342 Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
2343 Data Size: 566530 Bytes = 553 kB = 0 MB
2344 Load Address: 00000000
2345 Entry Point: 00000000
2346 Verifying Checksum ... OK
2348 => bootm 40100000 40200000
2349 ## Booting Linux kernel at 40100000 ...
2350 Image Name: 2.2.13 for initrd on TQM850L
2351 Image Type: PowerPC Linux Kernel Image (gzip compressed)
2352 Data Size: 335725 Bytes = 327 kB = 0 MB
2353 Load Address: 00000000
2354 Entry Point: 0000000c
2355 Verifying Checksum ... OK
2356 Uncompressing Kernel Image ... OK
2357 ## Loading RAMDisk Image at 40200000 ...
2358 Image Name: Simple Ramdisk Image
2359 Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
2360 Data Size: 566530 Bytes = 553 kB = 0 MB
2361 Load Address: 00000000
2362 Entry Point: 00000000
2363 Verifying Checksum ... OK
2364 Loading Ramdisk ... OK
2365 Linux version 2.2.13 (
[email protected]) (gcc version 2.95.2 19991024 (release)) #1 Wed Jul 19 02:32:08 MEST 2000
2366 Boot arguments: root=/dev/ram
2367 time_init: decrementer frequency = 187500000/60
2368 Calibrating delay loop... 49.77 BogoMIPS
2370 RAMDISK: Compressed image found at block 0
2371 VFS: Mounted root (ext2 filesystem).
2375 More About U-Boot Image Types:
2376 ------------------------------
2378 U-Boot supports the following image types:
2380 "Standalone Programs" are directly runnable in the environment
2381 provided by U-Boot; it is expected that (if they behave
2382 well) you can continue to work in U-Boot after return from
2383 the Standalone Program.
2384 "OS Kernel Images" are usually images of some Embedded OS which
2385 will take over control completely. Usually these programs
2386 will install their own set of exception handlers, device
2387 drivers, set up the MMU, etc. - this means, that you cannot
2388 expect to re-enter U-Boot except by resetting the CPU.
2389 "RAMDisk Images" are more or less just data blocks, and their
2390 parameters (address, size) are passed to an OS kernel that is
2392 "Multi-File Images" contain several images, typically an OS
2393 (Linux) kernel image and one or more data images like
2394 RAMDisks. This construct is useful for instance when you want
2395 to boot over the network using BOOTP etc., where the boot
2396 server provides just a single image file, but you want to get
2397 for instance an OS kernel and a RAMDisk image.
2399 "Multi-File Images" start with a list of image sizes, each
2400 image size (in bytes) specified by an "uint32_t" in network
2401 byte order. This list is terminated by an "(uint32_t)0".
2402 Immediately after the terminating 0 follow the images, one by
2403 one, all aligned on "uint32_t" boundaries (size rounded up to
2404 a multiple of 4 bytes).
2406 "Firmware Images" are binary images containing firmware (like
2407 U-Boot or FPGA images) which usually will be programmed to
2410 "Script files" are command sequences that will be executed by
2411 U-Boot's command interpreter; this feature is especially
2412 useful when you configure U-Boot to use a real shell (hush)
2413 as command interpreter.
2419 One of the features of U-Boot is that you can dynamically load and
2420 run "standalone" applications, which can use some resources of
2421 U-Boot like console I/O functions or interrupt services.
2423 Two simple examples are included with the sources:
2428 'examples/hello_world.c' contains a small "Hello World" Demo
2429 application; it is automatically compiled when you build U-Boot.
2430 It's configured to run at address 0x00040004, so you can play with it
2434 ## Ready for S-Record download ...
2435 ~>examples/hello_world.srec
2436 1 2 3 4 5 6 7 8 9 10 11 ...
2437 [file transfer complete]
2439 ## Start Addr = 0x00040004
2441 => go 40004 Hello World! This is a test.
2442 ## Starting application at 0x00040004 ...
2453 Hit any key to exit ...
2455 ## Application terminated, rc = 0x0
2457 Another example, which demonstrates how to register a CPM interrupt
2458 handler with the U-Boot code, can be found in 'examples/timer.c'.
2459 Here, a CPM timer is set up to generate an interrupt every second.
2460 The interrupt service routine is trivial, just printing a '.'
2461 character, but this is just a demo program. The application can be
2462 controlled by the following keys:
2464 ? - print current values og the CPM Timer registers
2465 b - enable interrupts and start timer
2466 e - stop timer and disable interrupts
2467 q - quit application
2470 ## Ready for S-Record download ...
2471 ~>examples/timer.srec
2472 1 2 3 4 5 6 7 8 9 10 11 ...
2473 [file transfer complete]
2475 ## Start Addr = 0x00040004
2478 ## Starting application at 0x00040004 ...
2481 tgcr @ 0xfff00980, tmr @ 0xfff00990, trr @ 0xfff00994, tcr @ 0xfff00998, tcn @ 0xfff0099c, ter @ 0xfff009b0
2484 [q, b, e, ?] Set interval 1000000 us
2487 [q, b, e, ?] ........
2488 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0xef6, ter=0x0
2491 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x2ad4, ter=0x0
2494 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x1efc, ter=0x0
2497 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x169d, ter=0x0
2499 [q, b, e, ?] ...Stopping timer
2501 [q, b, e, ?] ## Application terminated, rc = 0x0
2508 Over time, many people have reported problems when trying to used the
2509 "minicom" terminal emulation program for serial download. I (wd)
2510 consider minicom to be broken, and recommend not to use it. Under
2511 Unix, I recommend to use CKermit for general purpose use (and
2512 especially for kermit binary protocol download ("loadb" command), and
2513 use "cu" for S-Record download ("loads" command).
2518 Starting at version 0.9.2, U-Boot supports NetBSD both as host
2519 (build U-Boot) and target system (boots NetBSD/mpc8xx).
2521 Building requires a cross environment; it is known to work on
2522 NetBSD/i386 with the cross-powerpc-netbsd-1.3 package (you will also
2523 need gmake since the Makefiles are not compatible with BSD make).
2524 Note that the cross-powerpc package does not install include files;
2525 attempting to build U-Boot will fail because <machine/ansi.h> is
2526 missing. This file has to be installed and patched manually:
2528 # cd /usr/pkg/cross/powerpc-netbsd/include
2530 # ln -s powerpc machine
2531 # cp /usr/src/sys/arch/powerpc/include/ansi.h powerpc/ansi.h
2532 # ${EDIT} powerpc/ansi.h ## must remove __va_list, _BSD_VA_LIST
2534 Native builds *don't* work due to incompatibilities between native
2535 and U-Boot include files.
2537 Booting assumes that (the first part of) the image booted is a
2538 stage-2 loader which in turn loads and then invokes the kernel
2539 proper. Loader sources will eventually appear in the NetBSD source
2540 tree (probably in sys/arc/mpc8xx/stand/u-boot_stage2/); in the
2545 Implementation Internals:
2546 =========================
2548 The following is not intended to be a complete description of every
2549 implementation detail. However, it should help to understand the
2550 inner workings of U-Boot and make it easier to port it to custom
2554 Initial Stack, Global Data:
2555 ---------------------------
2557 The implementation of U-Boot is complicated by the fact that U-Boot
2558 starts running out of ROM (flash memory), usually without access to
2559 system RAM (because the memory controller is not initialized yet).
2560 This means that we don't have writable Data or BSS segments, and BSS
2561 is not initialized as zero. To be able to get a C environment working
2562 at all, we have to allocate at least a minimal stack. Implementation
2563 options for this are defined and restricted by the CPU used: Some CPU
2564 models provide on-chip memory (like the IMMR area on MPC8xx and
2565 MPC826x processors), on others (parts of) the data cache can be
2566 locked as (mis-) used as memory, etc.
2568 Chris Hallinan posted a good summy of these issues to the
2569 u-boot-users mailing list:
2571 Subject: RE: [U-Boot-Users] RE: More On Memory Bank x (nothingness)?
2573 Date: Mon, 10 Feb 2003 16:43:46 -0500 (22:43 MET)
2576 Correct me if I'm wrong, folks, but the way I understand it
2577 is this: Using DCACHE as initial RAM for Stack, etc, does not
2578 require any physical RAM backing up the cache. The cleverness
2579 is that the cache is being used as a temporary supply of
2580 necessary storage before the SDRAM controller is setup. It's
2581 beyond the scope of this list to expain the details, but you
2582 can see how this works by studying the cache architecture and
2583 operation in the architecture and processor-specific manuals.
2585 OCM is On Chip Memory, which I believe the 405GP has 4K. It
2586 is another option for the system designer to use as an
2587 initial stack/ram area prior to SDRAM being available. Either
2588 option should work for you. Using CS 4 should be fine if your
2589 board designers haven't used it for something that would
2590 cause you grief during the initial boot! It is frequently not
2593 CFG_INIT_RAM_ADDR should be somewhere that won't interfere
2594 with your processor/board/system design. The default value
2595 you will find in any recent u-boot distribution in
2596 Walnut405.h should work for you. I'd set it to a value larger
2597 than your SDRAM module. If you have a 64MB SDRAM module, set
2598 it above 400_0000. Just make sure your board has no resources
2599 that are supposed to respond to that address! That code in
2600 start.S has been around a while and should work as is when
2601 you get the config right.
2606 It is essential to remember this, since it has some impact on the C
2607 code for the initialization procedures:
2609 * Initialized global data (data segment) is read-only. Do not attempt
2612 * Do not use any unitialized global data (or implicitely initialized
2613 as zero data - BSS segment) at all - this is undefined, initiali-
2614 zation is performed later (when relocationg to RAM).
2616 * Stack space is very limited. Avoid big data buffers or things like
2619 Having only the stack as writable memory limits means we cannot use
2620 normal global data to share information beween the code. But it
2621 turned out that the implementation of U-Boot can be greatly
2622 simplified by making a global data structure (gd_t) available to all
2623 functions. We could pass a pointer to this data as argument to _all_
2624 functions, but this would bloat the code. Instead we use a feature of
2625 the GCC compiler (Global Register Variables) to share the data: we
2626 place a pointer (gd) to the global data into a register which we
2627 reserve for this purpose.
2629 When chosing a register for such a purpose we are restricted by the
2630 relevant (E)ABI specifications for the current architecture, and by
2631 GCC's implementation.
2633 For PowerPC, the following registers have specific use:
2636 R3-R4: parameter passing and return values
2637 R5-R10: parameter passing
2638 R13: small data area pointer
2642 (U-Boot also uses R14 as internal GOT pointer.)
2644 ==> U-Boot will use R29 to hold a pointer to the global data
2646 Note: on PPC, we could use a static initializer (since the
2647 address of the global data structure is known at compile time),
2648 but it turned out that reserving a register results in somewhat
2649 smaller code - although the code savings are not that big (on
2650 average for all boards 752 bytes for the whole U-Boot image,
2651 624 text + 127 data).
2653 On ARM, the following registers are used:
2655 R0: function argument word/integer result
2656 R1-R3: function argument word
2658 R10: stack limit (used only if stack checking if enabled)
2659 R11: argument (frame) pointer
2660 R12: temporary workspace
2663 R15: program counter
2665 ==> U-Boot will use R8 to hold a pointer to the global data
2672 U-Boot runs in system state and uses physical addresses, i.e. the
2673 MMU is not used either for address mapping nor for memory protection.
2675 The available memory is mapped to fixed addresses using the memory
2676 controller. In this process, a contiguous block is formed for each
2677 memory type (Flash, SDRAM, SRAM), even when it consists of several
2678 physical memory banks.
2680 U-Boot is installed in the first 128 kB of the first Flash bank (on
2681 TQM8xxL modules this is the range 0x40000000 ... 0x4001FFFF). After
2682 booting and sizing and initializing DRAM, the code relocates itself
2683 to the upper end of DRAM. Immediately below the U-Boot code some
2684 memory is reserved for use by malloc() [see CFG_MALLOC_LEN
2685 configuration setting]. Below that, a structure with global Board
2686 Info data is placed, followed by the stack (growing downward).
2688 Additionally, some exception handler code is copied to the low 8 kB
2689 of DRAM (0x00000000 ... 0x00001FFF).
2691 So a typical memory configuration with 16 MB of DRAM could look like
2694 0x0000 0000 Exception Vector code
2697 0x0000 2000 Free for Application Use
2703 0x00FB FF20 Monitor Stack (Growing downward)
2704 0x00FB FFAC Board Info Data and permanent copy of global data
2705 0x00FC 0000 Malloc Arena
2708 0x00FE 0000 RAM Copy of Monitor Code
2709 ... eventually: LCD or video framebuffer
2710 ... eventually: pRAM (Protected RAM - unchanged by reset)
2711 0x00FF FFFF [End of RAM]
2714 System Initialization:
2715 ----------------------
2717 In the reset configuration, U-Boot starts at the reset entry point
2718 (on most PowerPC systens at address 0x00000100). Because of the reset
2719 configuration for CS0# this is a mirror of the onboard Flash memory.
2720 To be able to re-map memory U-Boot then jumps to it's link address.
2721 To be able to implement the initialization code in C, a (small!)
2722 initial stack is set up in the internal Dual Ported RAM (in case CPUs
2723 which provide such a feature like MPC8xx or MPC8260), or in a locked
2724 part of the data cache. After that, U-Boot initializes the CPU core,
2725 the caches and the SIU.
2727 Next, all (potentially) available memory banks are mapped using a
2728 preliminary mapping. For example, we put them on 512 MB boundaries
2729 (multiples of 0x20000000: SDRAM on 0x00000000 and 0x20000000, Flash
2730 on 0x40000000 and 0x60000000, SRAM on 0x80000000). Then UPM A is
2731 programmed for SDRAM access. Using the temporary configuration, a
2732 simple memory test is run that determines the size of the SDRAM
2735 When there is more than one SDRAM bank, and the banks are of
2736 different size, the larger is mapped first. For equal size, the first
2737 bank (CS2#) is mapped first. The first mapping is always for address
2738 0x00000000, with any additional banks following immediately to create
2739 contiguous memory starting from 0.
2741 Then, the monitor installs itself at the upper end of the SDRAM area
2742 and allocates memory for use by malloc() and for the global Board
2743 Info data; also, the exception vector code is copied to the low RAM
2744 pages, and the final stack is set up.
2746 Only after this relocation will you have a "normal" C environment;
2747 until that you are restricted in several ways, mostly because you are
2748 running from ROM, and because the code will have to be relocated to a
2752 U-Boot Porting Guide:
2753 ----------------------
2755 [Based on messages by Jerry Van Baren in the U-Boot-Users mailing
2759 int main (int argc, char *argv[])
2761 sighandler_t no_more_time;
2763 signal (SIGALRM, no_more_time);
2764 alarm (PROJECT_DEADLINE - toSec (3 * WEEK));
2766 if (available_money > available_manpower) {
2767 pay consultant to port U-Boot;
2771 Download latest U-Boot source;
2773 Subscribe to u-boot-users mailing list;
2776 email ("Hi, I am new to U-Boot, how do I get started?");
2780 Read the README file in the top level directory;
2781 Read http://www.denx.de/re/DPLG.html
2782 Read the source, Luke;
2785 if (available_money > toLocalCurrency ($2500)) {
2788 Add a lot of aggravation and time;
2791 Create your own board support subdirectory;
2793 Create your own board config file;
2797 Add / modify source code;
2801 email ("Hi, I am having problems...");
2803 Send patch file to Wolfgang;
2808 void no_more_time (int sig)
2818 All contributions to U-Boot should conform to the Linux kernel
2819 coding style; see the file "Documentation/CodingStyle" in your Linux
2820 kernel source directory.
2822 Please note that U-Boot is implemented in C (and to some small parts
2823 in Assembler); no C++ is used, so please do not use C++ style
2824 comments (//) in your code.
2826 Submissions which do not conform to the standards may be returned
2827 with a request to reformat the changes.
2833 Since the number of patches for U-Boot is growing, we need to
2834 establish some rules. Submissions which do not conform to these rules
2835 may be rejected, even when they contain important and valuable stuff.
2838 When you send a patch, please include the following information with
2841 * For bug fixes: a description of the bug and how your patch fixes
2842 this bug. Please try to include a way of demonstrating that the
2843 patch actually fixes something.
2845 * For new features: a description of the feature and your
2848 * A CHANGELOG entry as plaintext (separate from the patch)
2850 * For major contributions, your entry to the CREDITS file
2852 * When you add support for a new board, don't forget to add this
2853 board to the MAKEALL script, too.
2855 * If your patch adds new configuration options, don't forget to
2856 document these in the README file.
2858 * The patch itself. If you are accessing the CVS repository use "cvs
2859 update; cvs diff -puRN"; else, use "diff -purN OLD NEW". If your
2860 version of diff does not support these options, then get the latest
2861 version of GNU diff.
2863 We accept patches as plain text, MIME attachments or as uuencoded
2868 * Before sending the patch, run the MAKEALL script on your patched
2869 source tree and make sure that no errors or warnings are reported
2870 for any of the boards.
2872 * Keep your modifications to the necessary minimum: A patch
2873 containing several unrelated changes or arbitrary reformats will be
2874 returned with a request to re-formatting / split it.
2876 * If you modify existing code, make sure that your new code does not
2877 add to the memory footprint of the code ;-) Small is beautiful!
2878 When adding new features, these should compile conditionally only
2879 (using #ifdef), and the resulting code with the new feature
2880 disabled must not need more memory than the old code without your
projects / J-u-boot.git / blob