1c609719bSwdenk# 23a473b2aSwdenk# (C) Copyright 2000 - 2004 3c609719bSwdenk# Wolfgang Denk, DENX Software Engineering, wd@denx.de. 4c609719bSwdenk# 5c609719bSwdenk# See file CREDITS for list of people who contributed to this 6c609719bSwdenk# project. 7c609719bSwdenk# 8c609719bSwdenk# This program is free software; you can redistribute it and/or 9c609719bSwdenk# modify it under the terms of the GNU General Public License as 10c609719bSwdenk# published by the Free Software Foundation; either version 2 of 11c609719bSwdenk# the License, or (at your option) any later version. 12c609719bSwdenk# 13c609719bSwdenk# This program is distributed in the hope that it will be useful, 14c609719bSwdenk# but WITHOUT ANY WARRANTY; without even the implied warranty of 15c609719bSwdenk# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16c609719bSwdenk# GNU General Public License for more details. 17c609719bSwdenk# 18c609719bSwdenk# You should have received a copy of the GNU General Public License 19c609719bSwdenk# along with this program; if not, write to the Free Software 20c609719bSwdenk# Foundation, Inc., 59 Temple Place, Suite 330, Boston, 21c609719bSwdenk# MA 02111-1307 USA 22c609719bSwdenk# 23c609719bSwdenk 24c609719bSwdenkSummary: 25c609719bSwdenk======== 26c609719bSwdenk 2724ee89b9SwdenkThis directory contains the source code for U-Boot, a boot loader for 2824ee89b9SwdenkEmbedded boards based on PowerPC and ARM processors, which can be 2924ee89b9Swdenkinstalled in a boot ROM and used to initialize and test the hardware 3024ee89b9Swdenkor to download and run application code. 31c609719bSwdenk 32c609719bSwdenkThe development of U-Boot is closely related to Linux: some parts of 3324ee89b9Swdenkthe source code originate in the Linux source tree, we have some 3424ee89b9Swdenkheader files in common, and special provision has been made to 35c609719bSwdenksupport booting of Linux images. 36c609719bSwdenk 37c609719bSwdenkSome attention has been paid to make this software easily 38c609719bSwdenkconfigurable and extendable. For instance, all monitor commands are 39c609719bSwdenkimplemented with the same call interface, so that it's very easy to 40c609719bSwdenkadd new commands. Also, instead of permanently adding rarely used 41c609719bSwdenkcode (for instance hardware test utilities) to the monitor, you can 42c609719bSwdenkload and run it dynamically. 43c609719bSwdenk 44c609719bSwdenk 45c609719bSwdenkStatus: 46c609719bSwdenk======= 47c609719bSwdenk 48c609719bSwdenkIn general, all boards for which a configuration option exists in the 49c609719bSwdenkMakefile have been tested to some extent and can be considered 50c609719bSwdenk"working". In fact, many of them are used in production systems. 51c609719bSwdenk 52c609719bSwdenkIn case of problems see the CHANGELOG and CREDITS files to find out 53c609719bSwdenkwho contributed the specific port. 54c609719bSwdenk 55c609719bSwdenk 56c609719bSwdenkWhere to get help: 57c609719bSwdenk================== 58c609719bSwdenk 59c609719bSwdenkIn case you have questions about, problems with or contributions for 60c609719bSwdenkU-Boot you should send a message to the U-Boot mailing list at 61c609719bSwdenk<u-boot-users@lists.sourceforge.net>. There is also an archive of 62c609719bSwdenkprevious traffic on the mailing list - please search the archive 63c609719bSwdenkbefore asking FAQ's. Please see 64c609719bSwdenkhttp://lists.sourceforge.net/lists/listinfo/u-boot-users/ 65c609719bSwdenk 66c609719bSwdenk 67c609719bSwdenkWhere we come from: 68c609719bSwdenk=================== 69c609719bSwdenk 70c609719bSwdenk- start from 8xxrom sources 7124ee89b9Swdenk- create PPCBoot project (http://sourceforge.net/projects/ppcboot) 72c609719bSwdenk- clean up code 73c609719bSwdenk- make it easier to add custom boards 74c609719bSwdenk- make it possible to add other [PowerPC] CPUs 75c609719bSwdenk- extend functions, especially: 76c609719bSwdenk * Provide extended interface to Linux boot loader 77c609719bSwdenk * S-Record download 78c609719bSwdenk * network boot 79c609719bSwdenk * PCMCIA / CompactFLash / ATA disk / SCSI ... boot 8024ee89b9Swdenk- create ARMBoot project (http://sourceforge.net/projects/armboot) 81c609719bSwdenk- add other CPU families (starting with ARM) 8224ee89b9Swdenk- create U-Boot project (http://sourceforge.net/projects/u-boot) 8324ee89b9Swdenk 8424ee89b9Swdenk 8524ee89b9SwdenkNames and Spelling: 8624ee89b9Swdenk=================== 8724ee89b9Swdenk 8824ee89b9SwdenkThe "official" name of this project is "Das U-Boot". The spelling 8924ee89b9Swdenk"U-Boot" shall be used in all written text (documentation, comments 9024ee89b9Swdenkin source files etc.). Example: 9124ee89b9Swdenk 9224ee89b9Swdenk This is the README file for the U-Boot project. 9324ee89b9Swdenk 9424ee89b9SwdenkFile names etc. shall be based on the string "u-boot". Examples: 9524ee89b9Swdenk 9624ee89b9Swdenk include/asm-ppc/u-boot.h 9724ee89b9Swdenk 9824ee89b9Swdenk #include <asm/u-boot.h> 9924ee89b9Swdenk 10024ee89b9SwdenkVariable names, preprocessor constants etc. shall be either based on 10124ee89b9Swdenkthe string "u_boot" or on "U_BOOT". Example: 10224ee89b9Swdenk 10324ee89b9Swdenk U_BOOT_VERSION u_boot_logo 10424ee89b9Swdenk IH_OS_U_BOOT u_boot_hush_start 105c609719bSwdenk 106c609719bSwdenk 10793f19cc0SwdenkVersioning: 10893f19cc0Swdenk=========== 10993f19cc0Swdenk 11093f19cc0SwdenkU-Boot uses a 3 level version number containing a version, a 11193f19cc0Swdenksub-version, and a patchlevel: "U-Boot-2.34.5" means version "2", 11293f19cc0Swdenksub-version "34", and patchlevel "4". 11393f19cc0Swdenk 11493f19cc0SwdenkThe patchlevel is used to indicate certain stages of development 11593f19cc0Swdenkbetween released versions, i. e. officially released versions of 11693f19cc0SwdenkU-Boot will always have a patchlevel of "0". 11793f19cc0Swdenk 11893f19cc0Swdenk 119c609719bSwdenkDirectory Hierarchy: 120c609719bSwdenk==================== 121c609719bSwdenk 1227152b1d0Swdenk- board Board dependent files 1237152b1d0Swdenk- common Misc architecture independent functions 124c609719bSwdenk- cpu CPU specific files 12511dadd54Swdenk - 74xx_7xx Files specific to Motorola MPC74xx and 7xx CPUs 12611dadd54Swdenk - arm720t Files specific to ARM 720 CPUs 12711dadd54Swdenk - arm920t Files specific to ARM 920 CPUs 12811dadd54Swdenk - arm925t Files specific to ARM 925 CPUs 12911dadd54Swdenk - arm926ejs Files specific to ARM 926 CPUs 13011dadd54Swdenk - at91rm9200 Files specific to Atmel AT91RM9200 CPUs 13111dadd54Swdenk - i386 Files specific to i386 CPUs 13211dadd54Swdenk - ixp Files specific to Intel XScale IXP CPUs 13311dadd54Swdenk - mcf52x2 Files specific to Motorola ColdFire MCF52x2 CPUs 13411dadd54Swdenk - mips Files specific to MIPS CPUs 13511dadd54Swdenk - mpc5xx Files specific to Motorola MPC5xx CPUs 13611dadd54Swdenk - mpc5xxx Files specific to Motorola MPC5xxx CPUs 13711dadd54Swdenk - mpc8xx Files specific to Motorola MPC8xx CPUs 13811dadd54Swdenk - mpc824x Files specific to Motorola MPC824x CPUs 13911dadd54Swdenk - mpc8260 Files specific to Motorola MPC8260 CPUs 14011dadd54Swdenk - mpc85xx Files specific to Motorola MPC85xx CPUs 14111dadd54Swdenk - nios Files specific to Altera NIOS CPUs 14211dadd54Swdenk - ppc4xx Files specific to IBM PowerPC 4xx CPUs 14311dadd54Swdenk - pxa Files specific to Intel XScale PXA CPUs 14411dadd54Swdenk - s3c44b0 Files specific to Samsung S3C44B0 CPUs 14511dadd54Swdenk - sa1100 Files specific to Intel StrongARM SA1100 CPUs 146c609719bSwdenk- disk Code for disk drive partition handling 147c609719bSwdenk- doc Documentation (don't expect too much) 1487152b1d0Swdenk- drivers Commonly used device drivers 149c609719bSwdenk- dtt Digital Thermometer and Thermostat drivers 150c609719bSwdenk- examples Example code for standalone applications, etc. 151c609719bSwdenk- include Header Files 15211dadd54Swdenk- lib_arm Files generic to ARM architecture 15311dadd54Swdenk- lib_generic Files generic to all architectures 15411dadd54Swdenk- lib_i386 Files generic to i386 architecture 15511dadd54Swdenk- lib_m68k Files generic to m68k architecture 15611dadd54Swdenk- lib_mips Files generic to MIPS architecture 15711dadd54Swdenk- lib_nios Files generic to NIOS architecture 15811dadd54Swdenk- lib_ppc Files generic to PowerPC architecture 159c609719bSwdenk- net Networking code 160c609719bSwdenk- post Power On Self Test 161c609719bSwdenk- rtc Real Time Clock drivers 162c609719bSwdenk- tools Tools to build S-Record or U-Boot images, etc. 163c609719bSwdenk 164c609719bSwdenkSoftware Configuration: 165c609719bSwdenk======================= 166c609719bSwdenk 167c609719bSwdenkConfiguration is usually done using C preprocessor defines; the 168c609719bSwdenkrationale behind that is to avoid dead code whenever possible. 169c609719bSwdenk 170c609719bSwdenkThere are two classes of configuration variables: 171c609719bSwdenk 172c609719bSwdenk* Configuration _OPTIONS_: 173c609719bSwdenk These are selectable by the user and have names beginning with 174c609719bSwdenk "CONFIG_". 175c609719bSwdenk 176c609719bSwdenk* Configuration _SETTINGS_: 177c609719bSwdenk These depend on the hardware etc. and should not be meddled with if 178c609719bSwdenk you don't know what you're doing; they have names beginning with 179c609719bSwdenk "CFG_". 180c609719bSwdenk 181c609719bSwdenkLater we will add a configuration tool - probably similar to or even 182c609719bSwdenkidentical to what's used for the Linux kernel. Right now, we have to 183c609719bSwdenkdo the configuration by hand, which means creating some symbolic 184c609719bSwdenklinks and editing some configuration files. We use the TQM8xxL boards 185c609719bSwdenkas an example here. 186c609719bSwdenk 187c609719bSwdenk 188c609719bSwdenkSelection of Processor Architecture and Board Type: 189c609719bSwdenk--------------------------------------------------- 190c609719bSwdenk 191c609719bSwdenkFor all supported boards there are ready-to-use default 192c609719bSwdenkconfigurations available; just type "make <board_name>_config". 193c609719bSwdenk 194c609719bSwdenkExample: For a TQM823L module type: 195c609719bSwdenk 196c609719bSwdenk cd u-boot 197c609719bSwdenk make TQM823L_config 198c609719bSwdenk 199c609719bSwdenkFor the Cogent platform, you need to specify the cpu type as well; 200c609719bSwdenke.g. "make cogent_mpc8xx_config". And also configure the cogent 201c609719bSwdenkdirectory according to the instructions in cogent/README. 202c609719bSwdenk 203c609719bSwdenk 204c609719bSwdenkConfiguration Options: 205c609719bSwdenk---------------------- 206c609719bSwdenk 207c609719bSwdenkConfiguration depends on the combination of board and CPU type; all 208c609719bSwdenksuch information is kept in a configuration file 209c609719bSwdenk"include/configs/<board_name>.h". 210c609719bSwdenk 211c609719bSwdenkExample: For a TQM823L module, all configuration settings are in 212c609719bSwdenk"include/configs/TQM823L.h". 213c609719bSwdenk 214c609719bSwdenk 2157f6c2cbcSwdenkMany of the options are named exactly as the corresponding Linux 2167f6c2cbcSwdenkkernel configuration options. The intention is to make it easier to 2177f6c2cbcSwdenkbuild a config tool - later. 2187f6c2cbcSwdenk 2197f6c2cbcSwdenk 220c609719bSwdenkThe following options need to be configured: 221c609719bSwdenk 222c609719bSwdenk- CPU Type: Define exactly one of 223c609719bSwdenk 224c609719bSwdenk PowerPC based CPUs: 225c609719bSwdenk ------------------- 226c609719bSwdenk CONFIG_MPC823, CONFIG_MPC850, CONFIG_MPC855, CONFIG_MPC860 2270db5bca8Swdenk or CONFIG_MPC5xx 228c609719bSwdenk or CONFIG_MPC824X, CONFIG_MPC8260 22942d1f039Swdenk or CONFIG_MPC85xx 230c609719bSwdenk or CONFIG_IOP480 231c609719bSwdenk or CONFIG_405GP 23212f34241Swdenk or CONFIG_405EP 233c609719bSwdenk or CONFIG_440 234c609719bSwdenk or CONFIG_MPC74xx 23572755c71Swdenk or CONFIG_750FX 236c609719bSwdenk 237c609719bSwdenk ARM based CPUs: 238c609719bSwdenk --------------- 239c609719bSwdenk CONFIG_SA1110 240c609719bSwdenk CONFIG_ARM7 241c609719bSwdenk CONFIG_PXA250 242c609719bSwdenk 243507bbe3eSwdenk MicroBlaze based CPUs: 244507bbe3eSwdenk ---------------------- 245857cad37Swdenk CONFIG_MICROBLAZE 246507bbe3eSwdenk 247c609719bSwdenk 248c609719bSwdenk- Board Type: Define exactly one of 249c609719bSwdenk 250c609719bSwdenk PowerPC based boards: 251c609719bSwdenk --------------------- 252c609719bSwdenk 25317ea1177Swdenk CONFIG_ADCIOP CONFIG_GEN860T CONFIG_PCI405 25417ea1177Swdenk CONFIG_ADS860 CONFIG_GENIETV CONFIG_PCIPPC2 25517ea1177Swdenk CONFIG_AMX860 CONFIG_GTH CONFIG_PCIPPC6 25617ea1177Swdenk CONFIG_AR405 CONFIG_gw8260 CONFIG_pcu_e 25717ea1177Swdenk CONFIG_BAB7xx CONFIG_hermes CONFIG_PIP405 25817ea1177Swdenk CONFIG_c2mon CONFIG_hymod CONFIG_PM826 25917ea1177Swdenk CONFIG_CANBT CONFIG_IAD210 CONFIG_ppmc8260 26017ea1177Swdenk CONFIG_CCM CONFIG_ICU862 CONFIG_QS823 26117ea1177Swdenk CONFIG_CMI CONFIG_IP860 CONFIG_QS850 26217ea1177Swdenk CONFIG_cogent_mpc8260 CONFIG_IPHASE4539 CONFIG_QS860T 26317ea1177Swdenk CONFIG_cogent_mpc8xx CONFIG_IVML24 CONFIG_RBC823 26417ea1177Swdenk CONFIG_CPCI405 CONFIG_IVML24_128 CONFIG_RPXClassic 26517ea1177Swdenk CONFIG_CPCI4052 CONFIG_IVML24_256 CONFIG_RPXlite 26617ea1177Swdenk CONFIG_CPCIISER4 CONFIG_IVMS8 CONFIG_RPXsuper 26717ea1177Swdenk CONFIG_CPU86 CONFIG_IVMS8_128 CONFIG_rsdproto 26817ea1177Swdenk CONFIG_CRAYL1 CONFIG_IVMS8_256 CONFIG_sacsng 26917ea1177Swdenk CONFIG_CSB272 CONFIG_JSE CONFIG_Sandpoint8240 27017ea1177Swdenk CONFIG_CU824 CONFIG_LANTEC CONFIG_Sandpoint8245 27117ea1177Swdenk CONFIG_DASA_SIM CONFIG_lwmon CONFIG_sbc8260 2728b07a110Swdenk CONFIG_DB64360 CONFIG_MBX CONFIG_sbc8560 2738b07a110Swdenk CONFIG_DB64460 CONFIG_MBX860T CONFIG_SM850 2748b07a110Swdenk CONFIG_DU405 CONFIG_MHPC CONFIG_SPD823TS 2758b07a110Swdenk CONFIG_DUET_ADS CONFIG_MIP405 CONFIG_STXGP3 2768b07a110Swdenk CONFIG_EBONY CONFIG_MOUSSE CONFIG_SXNI855T 2778b07a110Swdenk CONFIG_ELPPC CONFIG_MPC8260ADS CONFIG_TQM823L 2788b07a110Swdenk CONFIG_ELPT860 CONFIG_MPC8540ADS CONFIG_TQM8260 2798b07a110Swdenk CONFIG_ep8260 CONFIG_MPC8560ADS CONFIG_TQM850L 2808b07a110Swdenk CONFIG_ERIC CONFIG_MUSENKI CONFIG_TQM855L 2818b07a110Swdenk CONFIG_ESTEEM192E CONFIG_MVS1 CONFIG_TQM860L 2828b07a110Swdenk CONFIG_ETX094 CONFIG_NETPHONE CONFIG_TTTech 2838b07a110Swdenk CONFIG_EVB64260 CONFIG_NETTA CONFIG_UTX8245 2848b07a110Swdenk CONFIG_FADS823 CONFIG_NETVIA CONFIG_V37 2858b07a110Swdenk CONFIG_FADS850SAR CONFIG_NX823 CONFIG_W7OLMC 2868b07a110Swdenk CONFIG_FADS860T CONFIG_OCRTC CONFIG_W7OLMG 2878b07a110Swdenk CONFIG_FLAGADM CONFIG_ORSG CONFIG_WALNUT405 2888b07a110Swdenk CONFIG_FPS850L CONFIG_OXC CONFIG_ZPC1900 2898b07a110Swdenk CONFIG_FPS860L CONFIG_ZUMA 290c609719bSwdenk 291c609719bSwdenk ARM based boards: 292c609719bSwdenk ----------------- 293c609719bSwdenk 294b8c83181Swdenk CONFIG_AT91RM9200DK, CONFIG_CERF250, CONFIG_DNP1110, 295b8c83181Swdenk CONFIG_EP7312, CONFIG_H2_OMAP1610, CONFIG_HHP_CRADLE, 296b8c83181Swdenk CONFIG_IMPA7, CONFIG_INNOVATOROMAP1510, CONFIG_INNOVATOROMAP1610, 297b8c83181Swdenk CONFIG_LART, CONFIG_LPD7A400 CONFIG_LUBBOCK, 298b8c83181Swdenk CONFIG_OSK_OMAP5912, CONFIG_SHANNON, CONFIG_P2_OMAP730, 299b8c83181Swdenk CONFIG_SMDK2400, CONFIG_SMDK2410, CONFIG_TRAB, 300b8c83181Swdenk CONFIG_VCMA9 301c609719bSwdenk 302507bbe3eSwdenk MicroBlaze based boards: 303507bbe3eSwdenk ------------------------ 304507bbe3eSwdenk 305507bbe3eSwdenk CONFIG_SUZAKU 306507bbe3eSwdenk 307c609719bSwdenk 308c609719bSwdenk- CPU Module Type: (if CONFIG_COGENT is defined) 309c609719bSwdenk Define exactly one of 310c609719bSwdenk CONFIG_CMA286_60_OLD 311c609719bSwdenk--- FIXME --- not tested yet: 312c609719bSwdenk CONFIG_CMA286_60, CONFIG_CMA286_21, CONFIG_CMA286_60P, 313c609719bSwdenk CONFIG_CMA287_23, CONFIG_CMA287_50 314c609719bSwdenk 315c609719bSwdenk- Motherboard Type: (if CONFIG_COGENT is defined) 316c609719bSwdenk Define exactly one of 317c609719bSwdenk CONFIG_CMA101, CONFIG_CMA102 318c609719bSwdenk 319c609719bSwdenk- Motherboard I/O Modules: (if CONFIG_COGENT is defined) 320c609719bSwdenk Define one or more of 321c609719bSwdenk CONFIG_CMA302 322c609719bSwdenk 323c609719bSwdenk- Motherboard Options: (if CONFIG_CMA101 or CONFIG_CMA102 are defined) 324c609719bSwdenk Define one or more of 325c609719bSwdenk CONFIG_LCD_HEARTBEAT - update a character position on 326c609719bSwdenk the lcd display every second with 327c609719bSwdenk a "rotator" |\-/|\-/ 328c609719bSwdenk 3292535d602Swdenk- Board flavour: (if CONFIG_MPC8260ADS is defined) 3302535d602Swdenk CONFIG_ADSTYPE 3312535d602Swdenk Possible values are: 3322535d602Swdenk CFG_8260ADS - original MPC8260ADS 333180d3f74Swdenk CFG_8266ADS - MPC8266ADS 33454387ac9Swdenk CFG_PQ2FADS - PQ2FADS-ZU or PQ2FADS-VR 33504a85b3bSwdenk CFG_8272ADS - MPC8272ADS 3362535d602Swdenk 337c609719bSwdenk- MPC824X Family Member (if CONFIG_MPC824X is defined) 338c609719bSwdenk Define exactly one of 339c609719bSwdenk CONFIG_MPC8240, CONFIG_MPC8245 340c609719bSwdenk 34175d1ea7fSwdenk- 8xx CPU Options: (if using an MPC8xx cpu) 342c609719bSwdenk Define one or more of 3435da627a4Swdenk CONFIG_8xx_GCLK_FREQ - if get_gclk_freq() cannot work 3445da627a4Swdenk e.g. if there is no 32KHz 3455da627a4Swdenk reference PIT/RTC clock 346c609719bSwdenk 34775d1ea7fSwdenk- 859/866 CPU options: (if using a MPC859 or MPC866 CPU): 34875d1ea7fSwdenk CFG_866_OSCCLK 34975d1ea7fSwdenk CFG_866_CPUCLK_MIN 35075d1ea7fSwdenk CFG_866_CPUCLK_MAX 35175d1ea7fSwdenk CFG_866_CPUCLK_DEFAULT 35275d1ea7fSwdenk See doc/README.MPC866 35375d1ea7fSwdenk 35475d1ea7fSwdenk CFG_MEASURE_CPUCLK 35575d1ea7fSwdenk 35675d1ea7fSwdenk Define this to measure the actual CPU clock instead 35775d1ea7fSwdenk of relying on the correctness of the configured 35875d1ea7fSwdenk values. Mostly useful for board bringup to make sure 35975d1ea7fSwdenk the PLL is locked at the intended frequency. Note 36075d1ea7fSwdenk that this requires a (stable) reference clock (32 kHz 36175d1ea7fSwdenk RTC clock), 36275d1ea7fSwdenk 3635da627a4Swdenk- Linux Kernel Interface: 364c609719bSwdenk CONFIG_CLOCKS_IN_MHZ 365c609719bSwdenk 366c609719bSwdenk U-Boot stores all clock information in Hz 367c609719bSwdenk internally. For binary compatibility with older Linux 368c609719bSwdenk kernels (which expect the clocks passed in the 369c609719bSwdenk bd_info data to be in MHz) the environment variable 370c609719bSwdenk "clocks_in_mhz" can be defined so that U-Boot 371c609719bSwdenk converts clock data to MHZ before passing it to the 372c609719bSwdenk Linux kernel. 373c609719bSwdenk When CONFIG_CLOCKS_IN_MHZ is defined, a definition of 374c609719bSwdenk "clocks_in_mhz=1" is automatically included in the 375c609719bSwdenk default environment. 376c609719bSwdenk 3775da627a4Swdenk CONFIG_MEMSIZE_IN_BYTES [relevant for MIPS only] 3785da627a4Swdenk 3795da627a4Swdenk When transfering memsize parameter to linux, some versions 3805da627a4Swdenk expect it to be in bytes, others in MB. 3815da627a4Swdenk Define CONFIG_MEMSIZE_IN_BYTES to make it in bytes. 3825da627a4Swdenk 383*6705d81eSwdenk- Serial Ports: 384*6705d81eSwdenk CFG_PL010_SERIAL 385*6705d81eSwdenk 386*6705d81eSwdenk Define this if you want support for Amba PrimeCell PL010 UARTs. 387*6705d81eSwdenk 388*6705d81eSwdenk CFG_PL011_SERIAL 389*6705d81eSwdenk 390*6705d81eSwdenk Define this if you want support for Amba PrimeCell PL011 UARTs. 391*6705d81eSwdenk 392*6705d81eSwdenk CONFIG_PL011_CLOCK 393*6705d81eSwdenk 394*6705d81eSwdenk If you have Amba PrimeCell PL011 UARTs, set this variable to 395*6705d81eSwdenk the clock speed of the UARTs. 396*6705d81eSwdenk 397*6705d81eSwdenk CONFIG_PL01x_PORTS 398*6705d81eSwdenk 399*6705d81eSwdenk If you have Amba PrimeCell PL010 or PL011 UARTs on your board, 400*6705d81eSwdenk define this to a list of base addresses for each (supported) 401*6705d81eSwdenk port. See e.g. include/configs/versatile.h 402*6705d81eSwdenk 403*6705d81eSwdenk 404c609719bSwdenk- Console Interface: 405c609719bSwdenk Depending on board, define exactly one serial port 406c609719bSwdenk (like CONFIG_8xx_CONS_SMC1, CONFIG_8xx_CONS_SMC2, 407c609719bSwdenk CONFIG_8xx_CONS_SCC1, ...), or switch off the serial 408c609719bSwdenk console by defining CONFIG_8xx_CONS_NONE 409c609719bSwdenk 410c609719bSwdenk Note: if CONFIG_8xx_CONS_NONE is defined, the serial 411c609719bSwdenk port routines must be defined elsewhere 412c609719bSwdenk (i.e. serial_init(), serial_getc(), ...) 413c609719bSwdenk 414c609719bSwdenk CONFIG_CFB_CONSOLE 415c609719bSwdenk Enables console device for a color framebuffer. Needs following 416c609719bSwdenk defines (cf. smiLynxEM, i8042, board/eltec/bab7xx) 417c609719bSwdenk VIDEO_FB_LITTLE_ENDIAN graphic memory organisation 418c609719bSwdenk (default big endian) 419c609719bSwdenk VIDEO_HW_RECTFILL graphic chip supports 420c609719bSwdenk rectangle fill 421c609719bSwdenk (cf. smiLynxEM) 422c609719bSwdenk VIDEO_HW_BITBLT graphic chip supports 423c609719bSwdenk bit-blit (cf. smiLynxEM) 424c609719bSwdenk VIDEO_VISIBLE_COLS visible pixel columns 425c609719bSwdenk (cols=pitch) 426c609719bSwdenk VIDEO_VISIBLE_ROWS visible pixel rows 427c609719bSwdenk VIDEO_PIXEL_SIZE bytes per pixel 428c609719bSwdenk VIDEO_DATA_FORMAT graphic data format 429c609719bSwdenk (0-5, cf. cfb_console.c) 430c609719bSwdenk VIDEO_FB_ADRS framebuffer address 431c609719bSwdenk VIDEO_KBD_INIT_FCT keyboard int fct 432c609719bSwdenk (i.e. i8042_kbd_init()) 433c609719bSwdenk VIDEO_TSTC_FCT test char fct 434c609719bSwdenk (i.e. i8042_tstc) 435c609719bSwdenk VIDEO_GETC_FCT get char fct 436c609719bSwdenk (i.e. i8042_getc) 437c609719bSwdenk CONFIG_CONSOLE_CURSOR cursor drawing on/off 438c609719bSwdenk (requires blink timer 439c609719bSwdenk cf. i8042.c) 440c609719bSwdenk CFG_CONSOLE_BLINK_COUNT blink interval (cf. i8042.c) 441c609719bSwdenk CONFIG_CONSOLE_TIME display time/date info in 442c609719bSwdenk upper right corner 443c609719bSwdenk (requires CFG_CMD_DATE) 444c609719bSwdenk CONFIG_VIDEO_LOGO display Linux logo in 445c609719bSwdenk upper left corner 446a6c7ad2fSwdenk CONFIG_VIDEO_BMP_LOGO use bmp_logo.h instead of 447a6c7ad2fSwdenk linux_logo.h for logo. 448a6c7ad2fSwdenk Requires CONFIG_VIDEO_LOGO 449c609719bSwdenk CONFIG_CONSOLE_EXTRA_INFO 450c609719bSwdenk addional board info beside 451c609719bSwdenk the logo 452c609719bSwdenk 453c609719bSwdenk When CONFIG_CFB_CONSOLE is defined, video console is 454c609719bSwdenk default i/o. Serial console can be forced with 455c609719bSwdenk environment 'console=serial'. 456c609719bSwdenk 457a3ad8e26Swdenk When CONFIG_SILENT_CONSOLE is defined, all console 458a3ad8e26Swdenk messages (by U-Boot and Linux!) can be silenced with 459a3ad8e26Swdenk the "silent" environment variable. See 460a3ad8e26Swdenk doc/README.silent for more information. 461a3ad8e26Swdenk 462c609719bSwdenk- Console Baudrate: 463c609719bSwdenk CONFIG_BAUDRATE - in bps 464c609719bSwdenk Select one of the baudrates listed in 465c609719bSwdenk CFG_BAUDRATE_TABLE, see below. 4663bbc899fSwdenk CFG_BRGCLK_PRESCALE, baudrate prescale 467c609719bSwdenk 468c609719bSwdenk- Interrupt driven serial port input: 469c609719bSwdenk CONFIG_SERIAL_SOFTWARE_FIFO 470c609719bSwdenk 471c609719bSwdenk PPC405GP only. 472c609719bSwdenk Use an interrupt handler for receiving data on the 473c609719bSwdenk serial port. It also enables using hardware handshake 474c609719bSwdenk (RTS/CTS) and UART's built-in FIFO. Set the number of 475c609719bSwdenk bytes the interrupt driven input buffer should have. 476c609719bSwdenk 477109c0e3aSwdenk Leave undefined to disable this feature, including 478109c0e3aSwdenk disable the buffer and hardware handshake. 479c609719bSwdenk 4801d49b1f3Sstroese- Console UART Number: 4811d49b1f3Sstroese CONFIG_UART1_CONSOLE 4821d49b1f3Sstroese 4831d49b1f3Sstroese IBM PPC4xx only. 4841d49b1f3Sstroese If defined internal UART1 (and not UART0) is used 4851d49b1f3Sstroese as default U-Boot console. 4861d49b1f3Sstroese 487c609719bSwdenk- Boot Delay: CONFIG_BOOTDELAY - in seconds 488c609719bSwdenk Delay before automatically booting the default image; 489c609719bSwdenk set to -1 to disable autoboot. 490c609719bSwdenk 491c609719bSwdenk See doc/README.autoboot for these options that 492c609719bSwdenk work with CONFIG_BOOTDELAY. None are required. 493c609719bSwdenk CONFIG_BOOT_RETRY_TIME 494c609719bSwdenk CONFIG_BOOT_RETRY_MIN 495c609719bSwdenk CONFIG_AUTOBOOT_KEYED 496c609719bSwdenk CONFIG_AUTOBOOT_PROMPT 497c609719bSwdenk CONFIG_AUTOBOOT_DELAY_STR 498c609719bSwdenk CONFIG_AUTOBOOT_STOP_STR 499c609719bSwdenk CONFIG_AUTOBOOT_DELAY_STR2 500c609719bSwdenk CONFIG_AUTOBOOT_STOP_STR2 501c609719bSwdenk CONFIG_ZERO_BOOTDELAY_CHECK 502c609719bSwdenk CONFIG_RESET_TO_RETRY 503c609719bSwdenk 504c609719bSwdenk- Autoboot Command: 505c609719bSwdenk CONFIG_BOOTCOMMAND 506c609719bSwdenk Only needed when CONFIG_BOOTDELAY is enabled; 507c609719bSwdenk define a command string that is automatically executed 508c609719bSwdenk when no character is read on the console interface 509c609719bSwdenk within "Boot Delay" after reset. 510c609719bSwdenk 511c609719bSwdenk CONFIG_BOOTARGS 512c609719bSwdenk This can be used to pass arguments to the bootm 513c609719bSwdenk command. The value of CONFIG_BOOTARGS goes into the 514c609719bSwdenk environment value "bootargs". 515c609719bSwdenk 516c609719bSwdenk CONFIG_RAMBOOT and CONFIG_NFSBOOT 517c609719bSwdenk The value of these goes into the environment as 518c609719bSwdenk "ramboot" and "nfsboot" respectively, and can be used 519c609719bSwdenk as a convenience, when switching between booting from 520c609719bSwdenk ram and nfs. 521c609719bSwdenk 522c609719bSwdenk- Pre-Boot Commands: 523c609719bSwdenk CONFIG_PREBOOT 524c609719bSwdenk 525c609719bSwdenk When this option is #defined, the existence of the 526c609719bSwdenk environment variable "preboot" will be checked 527c609719bSwdenk immediately before starting the CONFIG_BOOTDELAY 528c609719bSwdenk countdown and/or running the auto-boot command resp. 529c609719bSwdenk entering interactive mode. 530c609719bSwdenk 531c609719bSwdenk This feature is especially useful when "preboot" is 532c609719bSwdenk automatically generated or modified. For an example 533c609719bSwdenk see the LWMON board specific code: here "preboot" is 534c609719bSwdenk modified when the user holds down a certain 535c609719bSwdenk combination of keys on the (special) keyboard when 536c609719bSwdenk booting the systems 537c609719bSwdenk 538c609719bSwdenk- Serial Download Echo Mode: 539c609719bSwdenk CONFIG_LOADS_ECHO 540c609719bSwdenk If defined to 1, all characters received during a 541c609719bSwdenk serial download (using the "loads" command) are 542c609719bSwdenk echoed back. This might be needed by some terminal 543c609719bSwdenk emulations (like "cu"), but may as well just take 544c609719bSwdenk time on others. This setting #define's the initial 545c609719bSwdenk value of the "loads_echo" environment variable. 546c609719bSwdenk 547c609719bSwdenk- Kgdb Serial Baudrate: (if CFG_CMD_KGDB is defined) 548c609719bSwdenk CONFIG_KGDB_BAUDRATE 549c609719bSwdenk Select one of the baudrates listed in 550c609719bSwdenk CFG_BAUDRATE_TABLE, see below. 551c609719bSwdenk 552c609719bSwdenk- Monitor Functions: 553c609719bSwdenk CONFIG_COMMANDS 554c609719bSwdenk Most monitor functions can be selected (or 555c609719bSwdenk de-selected) by adjusting the definition of 556c609719bSwdenk CONFIG_COMMANDS; to select individual functions, 557c609719bSwdenk #define CONFIG_COMMANDS by "OR"ing any of the 558c609719bSwdenk following values: 559c609719bSwdenk 560c609719bSwdenk #define enables commands: 561c609719bSwdenk ------------------------- 562c609719bSwdenk CFG_CMD_ASKENV * ask for env variable 56378137c3cSwdenk CFG_CMD_AUTOSCRIPT Autoscript Support 564c609719bSwdenk CFG_CMD_BDI bdinfo 565*6705d81eSwdenk CFG_CMD_BEDBUG * Include BedBug Debugger 56678137c3cSwdenk CFG_CMD_BMP * BMP support 567*6705d81eSwdenk CFG_CMD_BSP * Board specific commands 568c609719bSwdenk CFG_CMD_BOOTD bootd 569*6705d81eSwdenk CFG_CMD_CACHE * icache, dcache 570c609719bSwdenk CFG_CMD_CONSOLE coninfo 571c609719bSwdenk CFG_CMD_DATE * support for RTC, date/time... 572*6705d81eSwdenk CFG_CMD_DHCP * DHCP support 57378137c3cSwdenk CFG_CMD_DIAG * Diagnostics 57478137c3cSwdenk CFG_CMD_DOC * Disk-On-Chip Support 575*6705d81eSwdenk CFG_CMD_DTT * Digital Therm and Thermostat 576c609719bSwdenk CFG_CMD_ECHO * echo arguments 577c609719bSwdenk CFG_CMD_EEPROM * EEPROM read/write support 578*6705d81eSwdenk CFG_CMD_ELF * bootelf, bootvx 579c609719bSwdenk CFG_CMD_ENV saveenv 580c609719bSwdenk CFG_CMD_FDC * Floppy Disk Support 581*6705d81eSwdenk CFG_CMD_FAT * FAT partition support 5822262cfeeSwdenk CFG_CMD_FDOS * Dos diskette Support 583c609719bSwdenk CFG_CMD_FLASH flinfo, erase, protect 584c609719bSwdenk CFG_CMD_FPGA FPGA device initialization support 58578137c3cSwdenk CFG_CMD_HWFLOW * RTS/CTS hw flow control 586c609719bSwdenk CFG_CMD_I2C * I2C serial bus support 587c609719bSwdenk CFG_CMD_IDE * IDE harddisk support 588c609719bSwdenk CFG_CMD_IMI iminfo 58978137c3cSwdenk CFG_CMD_IMLS List all found images 590c609719bSwdenk CFG_CMD_IMMAP * IMMR dump support 591c609719bSwdenk CFG_CMD_IRQ * irqinfo 592*6705d81eSwdenk CFG_CMD_ITEST Integer/string test of 2 values 59378137c3cSwdenk CFG_CMD_JFFS2 * JFFS2 Support 594c609719bSwdenk CFG_CMD_KGDB * kgdb 595c609719bSwdenk CFG_CMD_LOADB loadb 596c609719bSwdenk CFG_CMD_LOADS loads 597c609719bSwdenk CFG_CMD_MEMORY md, mm, nm, mw, cp, cmp, crc, base, 59856523f12Swdenk loop, loopw, mtest 59978137c3cSwdenk CFG_CMD_MISC Misc functions like sleep etc 600*6705d81eSwdenk CFG_CMD_MMC * MMC memory mapped support 601*6705d81eSwdenk CFG_CMD_MII * MII utility commands 60278137c3cSwdenk CFG_CMD_NAND * NAND support 603c609719bSwdenk CFG_CMD_NET bootp, tftpboot, rarpboot 604c609719bSwdenk CFG_CMD_PCI * pciinfo 605c609719bSwdenk CFG_CMD_PCMCIA * PCMCIA support 60678137c3cSwdenk CFG_CMD_PING * send ICMP ECHO_REQUEST to network host 607ef5a9672Swdenk CFG_CMD_PORTIO * Port I/O 608c609719bSwdenk CFG_CMD_REGINFO * Register dump 609c609719bSwdenk CFG_CMD_RUN run command in env variable 610*6705d81eSwdenk CFG_CMD_SAVES * save S record dump 611c609719bSwdenk CFG_CMD_SCSI * SCSI Support 61278137c3cSwdenk CFG_CMD_SDRAM * print SDRAM configuration information 613c609719bSwdenk CFG_CMD_SETGETDCR Support for DCR Register access (4xx only) 614c609719bSwdenk CFG_CMD_SPI * SPI serial bus support 615c609719bSwdenk CFG_CMD_USB * USB support 61678137c3cSwdenk CFG_CMD_VFD * VFD support (TRAB) 617c609719bSwdenk CFG_CMD_BSP * Board SPecific functions 618a3d991bdSwdenk CFG_CMD_CDP * Cisco Discover Protocol support 619c609719bSwdenk ----------------------------------------------- 620c609719bSwdenk CFG_CMD_ALL all 621c609719bSwdenk 62281050926Swdenk CONFIG_CMD_DFL Default configuration; at the moment 623c609719bSwdenk this is includes all commands, except 624c609719bSwdenk the ones marked with "*" in the list 625c609719bSwdenk above. 626c609719bSwdenk 627c609719bSwdenk If you don't define CONFIG_COMMANDS it defaults to 62881050926Swdenk CONFIG_CMD_DFL in include/cmd_confdefs.h. A board can 629c609719bSwdenk override the default settings in the respective 630c609719bSwdenk include file. 631c609719bSwdenk 632c609719bSwdenk EXAMPLE: If you want all functions except of network 633c609719bSwdenk support you can write: 634c609719bSwdenk 635c609719bSwdenk #define CONFIG_COMMANDS (CFG_CMD_ALL & ~CFG_CMD_NET) 636c609719bSwdenk 637c609719bSwdenk 638c609719bSwdenk Note: Don't enable the "icache" and "dcache" commands 639c609719bSwdenk (configuration option CFG_CMD_CACHE) unless you know 640c609719bSwdenk what you (and your U-Boot users) are doing. Data 641c609719bSwdenk cache cannot be enabled on systems like the 8xx or 642c609719bSwdenk 8260 (where accesses to the IMMR region must be 643c609719bSwdenk uncached), and it cannot be disabled on all other 644c609719bSwdenk systems where we (mis-) use the data cache to hold an 645c609719bSwdenk initial stack and some data. 646c609719bSwdenk 647c609719bSwdenk 648c609719bSwdenk XXX - this list needs to get updated! 649c609719bSwdenk 650c609719bSwdenk- Watchdog: 651c609719bSwdenk CONFIG_WATCHDOG 652c609719bSwdenk If this variable is defined, it enables watchdog 6537152b1d0Swdenk support. There must be support in the platform specific 654c609719bSwdenk code for a watchdog. For the 8xx and 8260 CPUs, the 655c609719bSwdenk SIU Watchdog feature is enabled in the SYPCR 656c609719bSwdenk register. 657c609719bSwdenk 658c1551ea8Sstroese- U-Boot Version: 659c1551ea8Sstroese CONFIG_VERSION_VARIABLE 660c1551ea8Sstroese If this variable is defined, an environment variable 661c1551ea8Sstroese named "ver" is created by U-Boot showing the U-Boot 662c1551ea8Sstroese version as printed by the "version" command. 663c1551ea8Sstroese This variable is readonly. 664c1551ea8Sstroese 665c609719bSwdenk- Real-Time Clock: 666c609719bSwdenk 667c609719bSwdenk When CFG_CMD_DATE is selected, the type of the RTC 668c609719bSwdenk has to be selected, too. Define exactly one of the 669c609719bSwdenk following options: 670c609719bSwdenk 671c609719bSwdenk CONFIG_RTC_MPC8xx - use internal RTC of MPC8xx 672c609719bSwdenk CONFIG_RTC_PCF8563 - use Philips PCF8563 RTC 673c609719bSwdenk CONFIG_RTC_MC146818 - use MC146818 RTC 6741cb8e980Swdenk CONFIG_RTC_DS1307 - use Maxim, Inc. DS1307 RTC 675c609719bSwdenk CONFIG_RTC_DS1337 - use Maxim, Inc. DS1337 RTC 6767f70e853Swdenk CONFIG_RTC_DS1338 - use Maxim, Inc. DS1338 RTC 6773bac3513Swdenk CONFIG_RTC_DS164x - use Dallas DS164x RTC 6784c0d4c3bSwdenk CONFIG_RTC_MAX6900 - use Maxim, Inc. MAX6900 RTC 679c609719bSwdenk 680b37c7e5eSwdenk Note that if the RTC uses I2C, then the I2C interface 681b37c7e5eSwdenk must also be configured. See I2C Support, below. 682b37c7e5eSwdenk 683c609719bSwdenk- Timestamp Support: 684c609719bSwdenk 685c609719bSwdenk When CONFIG_TIMESTAMP is selected, the timestamp 686c609719bSwdenk (date and time) of an image is printed by image 687c609719bSwdenk commands like bootm or iminfo. This option is 688c609719bSwdenk automatically enabled when you select CFG_CMD_DATE . 689c609719bSwdenk 690c609719bSwdenk- Partition Support: 691c609719bSwdenk CONFIG_MAC_PARTITION and/or CONFIG_DOS_PARTITION 692c609719bSwdenk and/or CONFIG_ISO_PARTITION 693c609719bSwdenk 694c609719bSwdenk If IDE or SCSI support is enabled (CFG_CMD_IDE or 695c609719bSwdenk CFG_CMD_SCSI) you must configure support for at least 696c609719bSwdenk one partition type as well. 697c609719bSwdenk 698c609719bSwdenk- IDE Reset method: 6994d13cbadSwdenk CONFIG_IDE_RESET_ROUTINE - this is defined in several 7004d13cbadSwdenk board configurations files but used nowhere! 701c609719bSwdenk 7024d13cbadSwdenk CONFIG_IDE_RESET - is this is defined, IDE Reset will 7034d13cbadSwdenk be performed by calling the function 7044d13cbadSwdenk ide_set_reset(int reset) 7054d13cbadSwdenk which has to be defined in a board specific file 706c609719bSwdenk 707c609719bSwdenk- ATAPI Support: 708c609719bSwdenk CONFIG_ATAPI 709c609719bSwdenk 710c609719bSwdenk Set this to enable ATAPI support. 711c609719bSwdenk 712c40b2956Swdenk- LBA48 Support 713c40b2956Swdenk CONFIG_LBA48 714c40b2956Swdenk 715c40b2956Swdenk Set this to enable support for disks larger than 137GB 716c40b2956Swdenk Also look at CFG_64BIT_LBA ,CFG_64BIT_VSPRINTF and CFG_64BIT_STRTOUL 717c40b2956Swdenk Whithout these , LBA48 support uses 32bit variables and will 'only' 718c40b2956Swdenk support disks up to 2.1TB. 719c40b2956Swdenk 720c40b2956Swdenk CFG_64BIT_LBA: 721c40b2956Swdenk When enabled, makes the IDE subsystem use 64bit sector addresses. 722c40b2956Swdenk Default is 32bit. 723c40b2956Swdenk 724c609719bSwdenk- SCSI Support: 725c609719bSwdenk At the moment only there is only support for the 726c609719bSwdenk SYM53C8XX SCSI controller; define 727c609719bSwdenk CONFIG_SCSI_SYM53C8XX to enable it. 728c609719bSwdenk 729c609719bSwdenk CFG_SCSI_MAX_LUN [8], CFG_SCSI_MAX_SCSI_ID [7] and 730c609719bSwdenk CFG_SCSI_MAX_DEVICE [CFG_SCSI_MAX_SCSI_ID * 731c609719bSwdenk CFG_SCSI_MAX_LUN] can be adjusted to define the 732c609719bSwdenk maximum numbers of LUNs, SCSI ID's and target 733c609719bSwdenk devices. 734c609719bSwdenk CFG_SCSI_SYM53C8XX_CCF to fix clock timing (80Mhz) 735c609719bSwdenk 736c609719bSwdenk- NETWORK Support (PCI): 737682011ffSwdenk CONFIG_E1000 738682011ffSwdenk Support for Intel 8254x gigabit chips. 739682011ffSwdenk 740c609719bSwdenk CONFIG_EEPRO100 741c609719bSwdenk Support for Intel 82557/82559/82559ER chips. 742c609719bSwdenk Optional CONFIG_EEPRO100_SROM_WRITE enables eeprom 743c609719bSwdenk write routine for first time initialisation. 744c609719bSwdenk 745c609719bSwdenk CONFIG_TULIP 746c609719bSwdenk Support for Digital 2114x chips. 747c609719bSwdenk Optional CONFIG_TULIP_SELECT_MEDIA for board specific 748c609719bSwdenk modem chip initialisation (KS8761/QS6611). 749c609719bSwdenk 750c609719bSwdenk CONFIG_NATSEMI 751c609719bSwdenk Support for National dp83815 chips. 752c609719bSwdenk 753c609719bSwdenk CONFIG_NS8382X 754c609719bSwdenk Support for National dp8382[01] gigabit chips. 755c609719bSwdenk 75645219c46Swdenk- NETWORK Support (other): 75745219c46Swdenk 75845219c46Swdenk CONFIG_DRIVER_LAN91C96 75945219c46Swdenk Support for SMSC's LAN91C96 chips. 76045219c46Swdenk 76145219c46Swdenk CONFIG_LAN91C96_BASE 76245219c46Swdenk Define this to hold the physical address 76345219c46Swdenk of the LAN91C96's I/O space 76445219c46Swdenk 76545219c46Swdenk CONFIG_LAN91C96_USE_32_BIT 76645219c46Swdenk Define this to enable 32 bit addressing 76745219c46Swdenk 768f39748aeSwdenk CONFIG_DRIVER_SMC91111 769f39748aeSwdenk Support for SMSC's LAN91C111 chip 770f39748aeSwdenk 771f39748aeSwdenk CONFIG_SMC91111_BASE 772f39748aeSwdenk Define this to hold the physical address 773f39748aeSwdenk of the device (I/O space) 774f39748aeSwdenk 775f39748aeSwdenk CONFIG_SMC_USE_32_BIT 776f39748aeSwdenk Define this if data bus is 32 bits 777f39748aeSwdenk 778f39748aeSwdenk CONFIG_SMC_USE_IOFUNCS 779f39748aeSwdenk Define this to use i/o functions instead of macros 780f39748aeSwdenk (some hardware wont work with macros) 781f39748aeSwdenk 782c609719bSwdenk- USB Support: 783c609719bSwdenk At the moment only the UHCI host controller is 7844d13cbadSwdenk supported (PIP405, MIP405, MPC5200); define 785c609719bSwdenk CONFIG_USB_UHCI to enable it. 786c609719bSwdenk define CONFIG_USB_KEYBOARD to enable the USB Keyboard 787c609719bSwdenk end define CONFIG_USB_STORAGE to enable the USB 788c609719bSwdenk storage devices. 789c609719bSwdenk Note: 790c609719bSwdenk Supported are USB Keyboards and USB Floppy drives 791c609719bSwdenk (TEAC FD-05PUB). 7924d13cbadSwdenk MPC5200 USB requires additional defines: 7934d13cbadSwdenk CONFIG_USB_CLOCK 7944d13cbadSwdenk for 528 MHz Clock: 0x0001bbbb 7954d13cbadSwdenk CONFIG_USB_CONFIG 7964d13cbadSwdenk for differential drivers: 0x00001000 7974d13cbadSwdenk for single ended drivers: 0x00005000 7984d13cbadSwdenk 799c609719bSwdenk 80071f95118Swdenk- MMC Support: 80171f95118Swdenk The MMC controller on the Intel PXA is supported. To 80271f95118Swdenk enable this define CONFIG_MMC. The MMC can be 80371f95118Swdenk accessed from the boot prompt by mapping the device 80471f95118Swdenk to physical memory similar to flash. Command line is 80571f95118Swdenk enabled with CFG_CMD_MMC. The MMC driver also works with 80671f95118Swdenk the FAT fs. This is enabled with CFG_CMD_FAT. 80771f95118Swdenk 808*6705d81eSwdenk- Journaling Flash filesystem support: 809*6705d81eSwdenk CONFIG_JFFS2_NAND, CONFIG_JFFS2_NAND_OFF, CONFIG_JFFS2_NAND_SIZE, 810*6705d81eSwdenk CONFIG_JFFS2_NAND_DEV 811*6705d81eSwdenk Define these for a default partition on a NAND device 812*6705d81eSwdenk 813*6705d81eSwdenk CFG_JFFS2_FIRST_SECTOR, 814*6705d81eSwdenk CFG_JFFS2_FIRST_BANK, CFG_JFFS2_NUM_BANKS 815*6705d81eSwdenk Define these for a default partition on a NOR device 816*6705d81eSwdenk 817*6705d81eSwdenk CFG_JFFS_CUSTOM_PART 818*6705d81eSwdenk Define this to create an own partition. You have to provide a 819*6705d81eSwdenk function struct part_info* jffs2_part_info(int part_num) 820*6705d81eSwdenk 821*6705d81eSwdenk If you define only one JFFS2 partition you may also want to 822*6705d81eSwdenk #define CFG_JFFS_SINGLE_PART 1 823*6705d81eSwdenk to disable the command chpart. This is the default when you 824*6705d81eSwdenk have not defined a custom partition 825*6705d81eSwdenk 826c609719bSwdenk- Keyboard Support: 827c609719bSwdenk CONFIG_ISA_KEYBOARD 828c609719bSwdenk 829c609719bSwdenk Define this to enable standard (PC-Style) keyboard 830c609719bSwdenk support 831c609719bSwdenk 832c609719bSwdenk CONFIG_I8042_KBD 833c609719bSwdenk Standard PC keyboard driver with US (is default) and 834c609719bSwdenk GERMAN key layout (switch via environment 'keymap=de') support. 835c609719bSwdenk Export function i8042_kbd_init, i8042_tstc and i8042_getc 836c609719bSwdenk for cfb_console. Supports cursor blinking. 837c609719bSwdenk 838c609719bSwdenk- Video support: 839c609719bSwdenk CONFIG_VIDEO 840c609719bSwdenk 841c609719bSwdenk Define this to enable video support (for output to 842c609719bSwdenk video). 843c609719bSwdenk 844c609719bSwdenk CONFIG_VIDEO_CT69000 845c609719bSwdenk 846c609719bSwdenk Enable Chips & Technologies 69000 Video chip 847c609719bSwdenk 848c609719bSwdenk CONFIG_VIDEO_SMI_LYNXEM 849eeb1b77bSwdenk Enable Silicon Motion SMI 712/710/810 Video chip. The 850eeb1b77bSwdenk video output is selected via environment 'videoout' 851eeb1b77bSwdenk (1 = LCD and 2 = CRT). If videoout is undefined, CRT is 852eeb1b77bSwdenk assumed. 853c609719bSwdenk 854eeb1b77bSwdenk For the CT69000 and SMI_LYNXEM drivers, videomode is 855eeb1b77bSwdenk selected via environment 'videomode'. Two diferent ways 856eeb1b77bSwdenk are possible: 857eeb1b77bSwdenk - "videomode=num" 'num' is a standard LiLo mode numbers. 858eeb1b77bSwdenk Following standard modes are supported (* is default): 859eeb1b77bSwdenk 860eeb1b77bSwdenk Colors 640x480 800x600 1024x768 1152x864 1280x1024 861eeb1b77bSwdenk -------------+--------------------------------------------- 862eeb1b77bSwdenk 8 bits | 0x301* 0x303 0x305 0x161 0x307 863eeb1b77bSwdenk 15 bits | 0x310 0x313 0x316 0x162 0x319 864eeb1b77bSwdenk 16 bits | 0x311 0x314 0x317 0x163 0x31A 865eeb1b77bSwdenk 24 bits | 0x312 0x315 0x318 ? 0x31B 866eeb1b77bSwdenk -------------+--------------------------------------------- 867c609719bSwdenk (i.e. setenv videomode 317; saveenv; reset;) 868c609719bSwdenk 869eeb1b77bSwdenk - "videomode=bootargs" all the video parameters are parsed 870eeb1b77bSwdenk from the bootargs. (See drivers/videomodes.c) 871eeb1b77bSwdenk 872eeb1b77bSwdenk 873a6c7ad2fSwdenk CONFIG_VIDEO_SED13806 874a6c7ad2fSwdenk Enable Epson SED13806 driver. This driver supports 8bpp 875a6c7ad2fSwdenk and 16bpp modes defined by CONFIG_VIDEO_SED13806_8BPP 876a6c7ad2fSwdenk or CONFIG_VIDEO_SED13806_16BPP 877a6c7ad2fSwdenk 878682011ffSwdenk- Keyboard Support: 879682011ffSwdenk CONFIG_KEYBOARD 880682011ffSwdenk 881682011ffSwdenk Define this to enable a custom keyboard support. 882682011ffSwdenk This simply calls drv_keyboard_init() which must be 883682011ffSwdenk defined in your board-specific files. 884682011ffSwdenk The only board using this so far is RBC823. 885a6c7ad2fSwdenk 886c609719bSwdenk- LCD Support: CONFIG_LCD 887c609719bSwdenk 888c609719bSwdenk Define this to enable LCD support (for output to LCD 889c609719bSwdenk display); also select one of the supported displays 890c609719bSwdenk by defining one of these: 891c609719bSwdenk 892fd3103bbSwdenk CONFIG_NEC_NL6448AC33: 893c609719bSwdenk 894fd3103bbSwdenk NEC NL6448AC33-18. Active, color, single scan. 895c609719bSwdenk 896fd3103bbSwdenk CONFIG_NEC_NL6448BC20 897c609719bSwdenk 898fd3103bbSwdenk NEC NL6448BC20-08. 6.5", 640x480. 899fd3103bbSwdenk Active, color, single scan. 900fd3103bbSwdenk 901fd3103bbSwdenk CONFIG_NEC_NL6448BC33_54 902fd3103bbSwdenk 903fd3103bbSwdenk NEC NL6448BC33-54. 10.4", 640x480. 904c609719bSwdenk Active, color, single scan. 905c609719bSwdenk 906c609719bSwdenk CONFIG_SHARP_16x9 907c609719bSwdenk 908c609719bSwdenk Sharp 320x240. Active, color, single scan. 909c609719bSwdenk It isn't 16x9, and I am not sure what it is. 910c609719bSwdenk 911c609719bSwdenk CONFIG_SHARP_LQ64D341 912c609719bSwdenk 913c609719bSwdenk Sharp LQ64D341 display, 640x480. 914c609719bSwdenk Active, color, single scan. 915c609719bSwdenk 916c609719bSwdenk CONFIG_HLD1045 917c609719bSwdenk 918c609719bSwdenk HLD1045 display, 640x480. 919c609719bSwdenk Active, color, single scan. 920c609719bSwdenk 921c609719bSwdenk CONFIG_OPTREX_BW 922c609719bSwdenk 923c609719bSwdenk Optrex CBL50840-2 NF-FW 99 22 M5 924c609719bSwdenk or 925c609719bSwdenk Hitachi LMG6912RPFC-00T 926c609719bSwdenk or 927c609719bSwdenk Hitachi SP14Q002 928c609719bSwdenk 929c609719bSwdenk 320x240. Black & white. 930c609719bSwdenk 931c609719bSwdenk Normally display is black on white background; define 932c609719bSwdenk CFG_WHITE_ON_BLACK to get it inverted. 933c609719bSwdenk 9347152b1d0Swdenk- Splash Screen Support: CONFIG_SPLASH_SCREEN 935d791b1dcSwdenk 936d791b1dcSwdenk If this option is set, the environment is checked for 937d791b1dcSwdenk a variable "splashimage". If found, the usual display 938d791b1dcSwdenk of logo, copyright and system information on the LCD 939e94d2cd9Swdenk is suppressed and the BMP image at the address 940d791b1dcSwdenk specified in "splashimage" is loaded instead. The 941d791b1dcSwdenk console is redirected to the "nulldev", too. This 942d791b1dcSwdenk allows for a "silent" boot where a splash screen is 943d791b1dcSwdenk loaded very quickly after power-on. 944d791b1dcSwdenk 945c29fdfc1Swdenk- Compression support: 946c29fdfc1Swdenk CONFIG_BZIP2 947c29fdfc1Swdenk 948c29fdfc1Swdenk If this option is set, support for bzip2 compressed 949c29fdfc1Swdenk images is included. If not, only uncompressed and gzip 950c29fdfc1Swdenk compressed images are supported. 951c29fdfc1Swdenk 952c29fdfc1Swdenk NOTE: the bzip2 algorithm requires a lot of RAM, so 953c29fdfc1Swdenk the malloc area (as defined by CFG_MALLOC_LEN) should 954c29fdfc1Swdenk be at least 4MB. 955d791b1dcSwdenk 95617ea1177Swdenk- MII/PHY support: 95717ea1177Swdenk CONFIG_PHY_ADDR 95817ea1177Swdenk 95917ea1177Swdenk The address of PHY on MII bus. 96017ea1177Swdenk 96117ea1177Swdenk CONFIG_PHY_CLOCK_FREQ (ppc4xx) 96217ea1177Swdenk 96317ea1177Swdenk The clock frequency of the MII bus 96417ea1177Swdenk 96517ea1177Swdenk CONFIG_PHY_GIGE 96617ea1177Swdenk 96717ea1177Swdenk If this option is set, support for speed/duplex 96817ea1177Swdenk detection of Gigabit PHY is included. 96917ea1177Swdenk 97017ea1177Swdenk CONFIG_PHY_RESET_DELAY 97117ea1177Swdenk 97217ea1177Swdenk Some PHY like Intel LXT971A need extra delay after 97317ea1177Swdenk reset before any MII register access is possible. 97417ea1177Swdenk For such PHY, set this option to the usec delay 97517ea1177Swdenk required. (minimum 300usec for LXT971A) 97617ea1177Swdenk 97717ea1177Swdenk CONFIG_PHY_CMD_DELAY (ppc4xx) 97817ea1177Swdenk 97917ea1177Swdenk Some PHY like Intel LXT971A need extra delay after 98017ea1177Swdenk command issued before MII status register can be read 98117ea1177Swdenk 982c609719bSwdenk- Ethernet address: 983c609719bSwdenk CONFIG_ETHADDR 984c609719bSwdenk CONFIG_ETH2ADDR 985c609719bSwdenk CONFIG_ETH3ADDR 986c609719bSwdenk 987c609719bSwdenk Define a default value for ethernet address to use 988c609719bSwdenk for the respective ethernet interface, in case this 989c609719bSwdenk is not determined automatically. 990c609719bSwdenk 991c609719bSwdenk- IP address: 992c609719bSwdenk CONFIG_IPADDR 993c609719bSwdenk 994c609719bSwdenk Define a default value for the IP address to use for 995c609719bSwdenk the default ethernet interface, in case this is not 996c609719bSwdenk determined through e.g. bootp. 997c609719bSwdenk 998c609719bSwdenk- Server IP address: 999c609719bSwdenk CONFIG_SERVERIP 1000c609719bSwdenk 1001c609719bSwdenk Defines a default value for theIP address of a TFTP 1002c609719bSwdenk server to contact when using the "tftboot" command. 1003c609719bSwdenk 1004c609719bSwdenk- BOOTP Recovery Mode: 1005c609719bSwdenk CONFIG_BOOTP_RANDOM_DELAY 1006c609719bSwdenk 1007c609719bSwdenk If you have many targets in a network that try to 1008c609719bSwdenk boot using BOOTP, you may want to avoid that all 1009c609719bSwdenk systems send out BOOTP requests at precisely the same 1010c609719bSwdenk moment (which would happen for instance at recovery 1011c609719bSwdenk from a power failure, when all systems will try to 1012c609719bSwdenk boot, thus flooding the BOOTP server. Defining 1013c609719bSwdenk CONFIG_BOOTP_RANDOM_DELAY causes a random delay to be 1014c609719bSwdenk inserted before sending out BOOTP requests. The 1015c609719bSwdenk following delays are insterted then: 1016c609719bSwdenk 1017c609719bSwdenk 1st BOOTP request: delay 0 ... 1 sec 1018c609719bSwdenk 2nd BOOTP request: delay 0 ... 2 sec 1019c609719bSwdenk 3rd BOOTP request: delay 0 ... 4 sec 1020c609719bSwdenk 4th and following 1021c609719bSwdenk BOOTP requests: delay 0 ... 8 sec 1022c609719bSwdenk 1023fe389a82Sstroese- DHCP Advanced Options: 1024fe389a82Sstroese CONFIG_BOOTP_MASK 1025fe389a82Sstroese 1026fe389a82Sstroese You can fine tune the DHCP functionality by adding 1027fe389a82Sstroese these flags to the CONFIG_BOOTP_MASK define: 1028fe389a82Sstroese 1029fe389a82Sstroese CONFIG_BOOTP_DNS2 - If a DHCP client requests the DNS 1030fe389a82Sstroese serverip from a DHCP server, it is possible that more 1031fe389a82Sstroese than one DNS serverip is offered to the client. 1032fe389a82Sstroese If CONFIG_BOOTP_DNS2 is enabled, the secondary DNS 1033fe389a82Sstroese serverip will be stored in the additional environment 1034fe389a82Sstroese variable "dnsip2". The first DNS serverip is always 1035fe389a82Sstroese stored in the variable "dnsip", when CONFIG_BOOTP_DNS 1036fe389a82Sstroese is added to the CONFIG_BOOTP_MASK. 1037fe389a82Sstroese 1038fe389a82Sstroese CONFIG_BOOTP_SEND_HOSTNAME - Some DHCP servers are capable 1039fe389a82Sstroese to do a dynamic update of a DNS server. To do this, they 1040fe389a82Sstroese need the hostname of the DHCP requester. 1041fe389a82Sstroese If CONFIG_BOOP_SEND_HOSTNAME is added to the 1042fe389a82Sstroese CONFIG_BOOTP_MASK, the content of the "hostname" 1043fe389a82Sstroese environment variable is passed as option 12 to 1044fe389a82Sstroese the DHCP server. 1045fe389a82Sstroese 1046a3d991bdSwdenk - CDP Options: 1047a3d991bdSwdenk CONFIG_CDP_DEVICE_ID 1048a3d991bdSwdenk 1049a3d991bdSwdenk The device id used in CDP trigger frames. 1050a3d991bdSwdenk 1051a3d991bdSwdenk CONFIG_CDP_DEVICE_ID_PREFIX 1052a3d991bdSwdenk 1053a3d991bdSwdenk A two character string which is prefixed to the MAC address 1054a3d991bdSwdenk of the device. 1055a3d991bdSwdenk 1056a3d991bdSwdenk CONFIG_CDP_PORT_ID 1057a3d991bdSwdenk 1058a3d991bdSwdenk A printf format string which contains the ascii name of 1059a3d991bdSwdenk the port. Normally is set to "eth%d" which sets 1060a3d991bdSwdenk eth0 for the first ethernet, eth1 for the second etc. 1061a3d991bdSwdenk 1062a3d991bdSwdenk CONFIG_CDP_CAPABILITIES 1063a3d991bdSwdenk 1064a3d991bdSwdenk A 32bit integer which indicates the device capabilities; 1065a3d991bdSwdenk 0x00000010 for a normal host which does not forwards. 1066a3d991bdSwdenk 1067a3d991bdSwdenk CONFIG_CDP_VERSION 1068a3d991bdSwdenk 1069a3d991bdSwdenk An ascii string containing the version of the software. 1070a3d991bdSwdenk 1071a3d991bdSwdenk CONFIG_CDP_PLATFORM 1072a3d991bdSwdenk 1073a3d991bdSwdenk An ascii string containing the name of the platform. 1074a3d991bdSwdenk 1075a3d991bdSwdenk CONFIG_CDP_TRIGGER 1076a3d991bdSwdenk 1077a3d991bdSwdenk A 32bit integer sent on the trigger. 1078a3d991bdSwdenk 1079a3d991bdSwdenk CONFIG_CDP_POWER_CONSUMPTION 1080a3d991bdSwdenk 1081a3d991bdSwdenk A 16bit integer containing the power consumption of the 1082a3d991bdSwdenk device in .1 of milliwatts. 1083a3d991bdSwdenk 1084a3d991bdSwdenk CONFIG_CDP_APPLIANCE_VLAN_TYPE 1085a3d991bdSwdenk 1086a3d991bdSwdenk A byte containing the id of the VLAN. 1087a3d991bdSwdenk 1088c609719bSwdenk- Status LED: CONFIG_STATUS_LED 1089c609719bSwdenk 1090c609719bSwdenk Several configurations allow to display the current 1091c609719bSwdenk status using a LED. For instance, the LED will blink 1092c609719bSwdenk fast while running U-Boot code, stop blinking as 1093c609719bSwdenk soon as a reply to a BOOTP request was received, and 1094c609719bSwdenk start blinking slow once the Linux kernel is running 1095c609719bSwdenk (supported by a status LED driver in the Linux 1096c609719bSwdenk kernel). Defining CONFIG_STATUS_LED enables this 1097c609719bSwdenk feature in U-Boot. 1098c609719bSwdenk 1099c609719bSwdenk- CAN Support: CONFIG_CAN_DRIVER 1100c609719bSwdenk 1101c609719bSwdenk Defining CONFIG_CAN_DRIVER enables CAN driver support 1102c609719bSwdenk on those systems that support this (optional) 1103c609719bSwdenk feature, like the TQM8xxL modules. 1104c609719bSwdenk 1105c609719bSwdenk- I2C Support: CONFIG_HARD_I2C | CONFIG_SOFT_I2C 1106c609719bSwdenk 1107b37c7e5eSwdenk These enable I2C serial bus commands. Defining either of 1108b37c7e5eSwdenk (but not both of) CONFIG_HARD_I2C or CONFIG_SOFT_I2C will 1109b37c7e5eSwdenk include the appropriate I2C driver for the selected cpu. 1110c609719bSwdenk 1111b37c7e5eSwdenk This will allow you to use i2c commands at the u-boot 1112b37c7e5eSwdenk command line (as long as you set CFG_CMD_I2C in 1113b37c7e5eSwdenk CONFIG_COMMANDS) and communicate with i2c based realtime 1114b37c7e5eSwdenk clock chips. See common/cmd_i2c.c for a description of the 1115c609719bSwdenk command line interface. 1116c609719bSwdenk 1117b37c7e5eSwdenk CONFIG_HARD_I2C selects the CPM hardware driver for I2C. 1118c609719bSwdenk 1119b37c7e5eSwdenk CONFIG_SOFT_I2C configures u-boot to use a software (aka 1120b37c7e5eSwdenk bit-banging) driver instead of CPM or similar hardware 1121b37c7e5eSwdenk support for I2C. 1122c609719bSwdenk 1123b37c7e5eSwdenk There are several other quantities that must also be 1124b37c7e5eSwdenk defined when you define CONFIG_HARD_I2C or CONFIG_SOFT_I2C. 1125c609719bSwdenk 1126b37c7e5eSwdenk In both cases you will need to define CFG_I2C_SPEED 1127b37c7e5eSwdenk to be the frequency (in Hz) at which you wish your i2c bus 1128b37c7e5eSwdenk to run and CFG_I2C_SLAVE to be the address of this node (ie 1129b37c7e5eSwdenk the cpu's i2c node address). 1130c609719bSwdenk 1131b37c7e5eSwdenk Now, the u-boot i2c code for the mpc8xx (cpu/mpc8xx/i2c.c) 1132b37c7e5eSwdenk sets the cpu up as a master node and so its address should 1133b37c7e5eSwdenk therefore be cleared to 0 (See, eg, MPC823e User's Manual 1134b37c7e5eSwdenk p.16-473). So, set CFG_I2C_SLAVE to 0. 1135b37c7e5eSwdenk 1136b37c7e5eSwdenk That's all that's required for CONFIG_HARD_I2C. 1137b37c7e5eSwdenk 1138b37c7e5eSwdenk If you use the software i2c interface (CONFIG_SOFT_I2C) 1139b37c7e5eSwdenk then the following macros need to be defined (examples are 1140b37c7e5eSwdenk from include/configs/lwmon.h): 1141c609719bSwdenk 1142c609719bSwdenk I2C_INIT 1143c609719bSwdenk 1144b37c7e5eSwdenk (Optional). Any commands necessary to enable the I2C 1145c609719bSwdenk controller or configure ports. 1146c609719bSwdenk 1147b37c7e5eSwdenk eg: #define I2C_INIT (immr->im_cpm.cp_pbdir |= PB_SCL) 1148b37c7e5eSwdenk 1149c609719bSwdenk I2C_PORT 1150c609719bSwdenk 1151c609719bSwdenk (Only for MPC8260 CPU). The I/O port to use (the code 1152c609719bSwdenk assumes both bits are on the same port). Valid values 1153c609719bSwdenk are 0..3 for ports A..D. 1154c609719bSwdenk 1155c609719bSwdenk I2C_ACTIVE 1156c609719bSwdenk 1157c609719bSwdenk The code necessary to make the I2C data line active 1158c609719bSwdenk (driven). If the data line is open collector, this 1159c609719bSwdenk define can be null. 1160c609719bSwdenk 1161b37c7e5eSwdenk eg: #define I2C_ACTIVE (immr->im_cpm.cp_pbdir |= PB_SDA) 1162b37c7e5eSwdenk 1163c609719bSwdenk I2C_TRISTATE 1164c609719bSwdenk 1165c609719bSwdenk The code necessary to make the I2C data line tri-stated 1166c609719bSwdenk (inactive). If the data line is open collector, this 1167c609719bSwdenk define can be null. 1168c609719bSwdenk 1169b37c7e5eSwdenk eg: #define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA) 1170b37c7e5eSwdenk 1171c609719bSwdenk I2C_READ 1172c609719bSwdenk 1173c609719bSwdenk Code that returns TRUE if the I2C data line is high, 1174c609719bSwdenk FALSE if it is low. 1175c609719bSwdenk 1176b37c7e5eSwdenk eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0) 1177b37c7e5eSwdenk 1178c609719bSwdenk I2C_SDA(bit) 1179c609719bSwdenk 1180c609719bSwdenk If <bit> is TRUE, sets the I2C data line high. If it 1181c609719bSwdenk is FALSE, it clears it (low). 1182c609719bSwdenk 1183b37c7e5eSwdenk eg: #define I2C_SDA(bit) \ 1184b37c7e5eSwdenk if(bit) immr->im_cpm.cp_pbdat |= PB_SDA; \ 1185b37c7e5eSwdenk else immr->im_cpm.cp_pbdat &= ~PB_SDA 1186b37c7e5eSwdenk 1187c609719bSwdenk I2C_SCL(bit) 1188c609719bSwdenk 1189c609719bSwdenk If <bit> is TRUE, sets the I2C clock line high. If it 1190c609719bSwdenk is FALSE, it clears it (low). 1191c609719bSwdenk 1192b37c7e5eSwdenk eg: #define I2C_SCL(bit) \ 1193b37c7e5eSwdenk if(bit) immr->im_cpm.cp_pbdat |= PB_SCL; \ 1194b37c7e5eSwdenk else immr->im_cpm.cp_pbdat &= ~PB_SCL 1195b37c7e5eSwdenk 1196c609719bSwdenk I2C_DELAY 1197c609719bSwdenk 1198c609719bSwdenk This delay is invoked four times per clock cycle so this 1199c609719bSwdenk controls the rate of data transfer. The data rate thus 1200b37c7e5eSwdenk is 1 / (I2C_DELAY * 4). Often defined to be something 1201b37c7e5eSwdenk like: 1202b37c7e5eSwdenk 1203b37c7e5eSwdenk #define I2C_DELAY udelay(2) 1204c609719bSwdenk 120547cd00faSwdenk CFG_I2C_INIT_BOARD 120647cd00faSwdenk 120747cd00faSwdenk When a board is reset during an i2c bus transfer 120847cd00faSwdenk chips might think that the current transfer is still 120947cd00faSwdenk in progress. On some boards it is possible to access 121047cd00faSwdenk the i2c SCLK line directly, either by using the 121147cd00faSwdenk processor pin as a GPIO or by having a second pin 121247cd00faSwdenk connected to the bus. If this option is defined a 121347cd00faSwdenk custom i2c_init_board() routine in boards/xxx/board.c 121447cd00faSwdenk is run early in the boot sequence. 121547cd00faSwdenk 121617ea1177Swdenk CONFIG_I2CFAST (PPC405GP|PPC405EP only) 121717ea1177Swdenk 121817ea1177Swdenk This option enables configuration of bi_iic_fast[] flags 121917ea1177Swdenk in u-boot bd_info structure based on u-boot environment 122017ea1177Swdenk variable "i2cfast". (see also i2cfast) 122117ea1177Swdenk 1222c609719bSwdenk- SPI Support: CONFIG_SPI 1223c609719bSwdenk 1224c609719bSwdenk Enables SPI driver (so far only tested with 1225c609719bSwdenk SPI EEPROM, also an instance works with Crystal A/D and 1226c609719bSwdenk D/As on the SACSng board) 1227c609719bSwdenk 1228c609719bSwdenk CONFIG_SPI_X 1229c609719bSwdenk 1230c609719bSwdenk Enables extended (16-bit) SPI EEPROM addressing. 1231c609719bSwdenk (symmetrical to CONFIG_I2C_X) 1232c609719bSwdenk 1233c609719bSwdenk CONFIG_SOFT_SPI 1234c609719bSwdenk 1235c609719bSwdenk Enables a software (bit-bang) SPI driver rather than 1236c609719bSwdenk using hardware support. This is a general purpose 1237c609719bSwdenk driver that only requires three general I/O port pins 1238c609719bSwdenk (two outputs, one input) to function. If this is 1239c609719bSwdenk defined, the board configuration must define several 1240c609719bSwdenk SPI configuration items (port pins to use, etc). For 1241c609719bSwdenk an example, see include/configs/sacsng.h. 1242c609719bSwdenk 1243c609719bSwdenk- FPGA Support: CONFIG_FPGA_COUNT 1244c609719bSwdenk 1245c609719bSwdenk Specify the number of FPGA devices to support. 1246c609719bSwdenk 1247c609719bSwdenk CONFIG_FPGA 1248c609719bSwdenk 1249c609719bSwdenk Used to specify the types of FPGA devices. For example, 1250c609719bSwdenk #define CONFIG_FPGA CFG_XILINX_VIRTEX2 1251c609719bSwdenk 1252c609719bSwdenk CFG_FPGA_PROG_FEEDBACK 1253c609719bSwdenk 1254c609719bSwdenk Enable printing of hash marks during FPGA configuration. 1255c609719bSwdenk 1256c609719bSwdenk CFG_FPGA_CHECK_BUSY 1257c609719bSwdenk 1258c609719bSwdenk Enable checks on FPGA configuration interface busy 1259c609719bSwdenk status by the configuration function. This option 1260c609719bSwdenk will require a board or device specific function to 1261c609719bSwdenk be written. 1262c609719bSwdenk 1263c609719bSwdenk CONFIG_FPGA_DELAY 1264c609719bSwdenk 1265c609719bSwdenk If defined, a function that provides delays in the FPGA 1266c609719bSwdenk configuration driver. 1267c609719bSwdenk 1268c609719bSwdenk CFG_FPGA_CHECK_CTRLC 1269c609719bSwdenk Allow Control-C to interrupt FPGA configuration 1270c609719bSwdenk 1271c609719bSwdenk CFG_FPGA_CHECK_ERROR 1272c609719bSwdenk 1273c609719bSwdenk Check for configuration errors during FPGA bitfile 1274c609719bSwdenk loading. For example, abort during Virtex II 1275c609719bSwdenk configuration if the INIT_B line goes low (which 1276c609719bSwdenk indicated a CRC error). 1277c609719bSwdenk 1278c609719bSwdenk CFG_FPGA_WAIT_INIT 1279c609719bSwdenk 1280c609719bSwdenk Maximum time to wait for the INIT_B line to deassert 1281c609719bSwdenk after PROB_B has been deasserted during a Virtex II 1282c609719bSwdenk FPGA configuration sequence. The default time is 500 1283c609719bSwdenk mS. 1284c609719bSwdenk 1285c609719bSwdenk CFG_FPGA_WAIT_BUSY 1286c609719bSwdenk 1287c609719bSwdenk Maximum time to wait for BUSY to deassert during 1288c609719bSwdenk Virtex II FPGA configuration. The default is 5 mS. 1289c609719bSwdenk 1290c609719bSwdenk CFG_FPGA_WAIT_CONFIG 1291c609719bSwdenk 1292c609719bSwdenk Time to wait after FPGA configuration. The default is 1293c609719bSwdenk 200 mS. 1294c609719bSwdenk 1295c609719bSwdenk- Configuration Management: 1296c609719bSwdenk CONFIG_IDENT_STRING 1297c609719bSwdenk 1298c609719bSwdenk If defined, this string will be added to the U-Boot 1299c609719bSwdenk version information (U_BOOT_VERSION) 1300c609719bSwdenk 1301c609719bSwdenk- Vendor Parameter Protection: 1302c609719bSwdenk 1303c609719bSwdenk U-Boot considers the values of the environment 1304c609719bSwdenk variables "serial#" (Board Serial Number) and 13057152b1d0Swdenk "ethaddr" (Ethernet Address) to be parameters that 1306c609719bSwdenk are set once by the board vendor / manufacturer, and 1307c609719bSwdenk protects these variables from casual modification by 1308c609719bSwdenk the user. Once set, these variables are read-only, 1309c609719bSwdenk and write or delete attempts are rejected. You can 1310c609719bSwdenk change this behviour: 1311c609719bSwdenk 1312c609719bSwdenk If CONFIG_ENV_OVERWRITE is #defined in your config 1313c609719bSwdenk file, the write protection for vendor parameters is 131447cd00faSwdenk completely disabled. Anybody can change or delete 1315c609719bSwdenk these parameters. 1316c609719bSwdenk 1317c609719bSwdenk Alternatively, if you #define _both_ CONFIG_ETHADDR 1318c609719bSwdenk _and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default 1319c609719bSwdenk ethernet address is installed in the environment, 1320c609719bSwdenk which can be changed exactly ONCE by the user. [The 1321c609719bSwdenk serial# is unaffected by this, i. e. it remains 1322c609719bSwdenk read-only.] 1323c609719bSwdenk 1324c609719bSwdenk- Protected RAM: 1325c609719bSwdenk CONFIG_PRAM 1326c609719bSwdenk 1327c609719bSwdenk Define this variable to enable the reservation of 1328c609719bSwdenk "protected RAM", i. e. RAM which is not overwritten 1329c609719bSwdenk by U-Boot. Define CONFIG_PRAM to hold the number of 1330c609719bSwdenk kB you want to reserve for pRAM. You can overwrite 1331c609719bSwdenk this default value by defining an environment 1332c609719bSwdenk variable "pram" to the number of kB you want to 1333c609719bSwdenk reserve. Note that the board info structure will 1334c609719bSwdenk still show the full amount of RAM. If pRAM is 1335c609719bSwdenk reserved, a new environment variable "mem" will 1336c609719bSwdenk automatically be defined to hold the amount of 1337c609719bSwdenk remaining RAM in a form that can be passed as boot 1338c609719bSwdenk argument to Linux, for instance like that: 1339c609719bSwdenk 1340c609719bSwdenk setenv bootargs ... mem=\$(mem) 1341c609719bSwdenk saveenv 1342c609719bSwdenk 1343c609719bSwdenk This way you can tell Linux not to use this memory, 1344c609719bSwdenk either, which results in a memory region that will 1345c609719bSwdenk not be affected by reboots. 1346c609719bSwdenk 1347c609719bSwdenk *WARNING* If your board configuration uses automatic 1348c609719bSwdenk detection of the RAM size, you must make sure that 1349c609719bSwdenk this memory test is non-destructive. So far, the 1350c609719bSwdenk following board configurations are known to be 1351c609719bSwdenk "pRAM-clean": 1352c609719bSwdenk 1353c609719bSwdenk ETX094, IVMS8, IVML24, SPD8xx, TQM8xxL, 1354c609719bSwdenk HERMES, IP860, RPXlite, LWMON, LANTEC, 1355c609719bSwdenk PCU_E, FLAGADM, TQM8260 1356c609719bSwdenk 1357c609719bSwdenk- Error Recovery: 1358c609719bSwdenk CONFIG_PANIC_HANG 1359c609719bSwdenk 1360c609719bSwdenk Define this variable to stop the system in case of a 1361c609719bSwdenk fatal error, so that you have to reset it manually. 1362c609719bSwdenk This is probably NOT a good idea for an embedded 1363c609719bSwdenk system where you want to system to reboot 1364c609719bSwdenk automatically as fast as possible, but it may be 1365c609719bSwdenk useful during development since you can try to debug 1366c609719bSwdenk the conditions that lead to the situation. 1367c609719bSwdenk 1368c609719bSwdenk CONFIG_NET_RETRY_COUNT 1369c609719bSwdenk 1370c609719bSwdenk This variable defines the number of retries for 1371c609719bSwdenk network operations like ARP, RARP, TFTP, or BOOTP 1372c609719bSwdenk before giving up the operation. If not defined, a 1373c609719bSwdenk default value of 5 is used. 1374c609719bSwdenk 1375c609719bSwdenk- Command Interpreter: 137604a85b3bSwdenk CFG_AUTO_COMPLETE 137704a85b3bSwdenk 137804a85b3bSwdenk Enable auto completion of commands using TAB. 137904a85b3bSwdenk 1380c609719bSwdenk CFG_HUSH_PARSER 1381c609719bSwdenk 1382c609719bSwdenk Define this variable to enable the "hush" shell (from 1383c609719bSwdenk Busybox) as command line interpreter, thus enabling 1384c609719bSwdenk powerful command line syntax like 1385c609719bSwdenk if...then...else...fi conditionals or `&&' and '||' 1386c609719bSwdenk constructs ("shell scripts"). 1387c609719bSwdenk 1388c609719bSwdenk If undefined, you get the old, much simpler behaviour 1389c609719bSwdenk with a somewhat smaller memory footprint. 1390c609719bSwdenk 1391c609719bSwdenk 1392c609719bSwdenk CFG_PROMPT_HUSH_PS2 1393c609719bSwdenk 1394c609719bSwdenk This defines the secondary prompt string, which is 1395c609719bSwdenk printed when the command interpreter needs more input 1396c609719bSwdenk to complete a command. Usually "> ". 1397c609719bSwdenk 1398c609719bSwdenk Note: 1399c609719bSwdenk 1400c609719bSwdenk In the current implementation, the local variables 1401c609719bSwdenk space and global environment variables space are 1402c609719bSwdenk separated. Local variables are those you define by 14033b57fe0aSwdenk simply typing `name=value'. To access a local 1404c609719bSwdenk variable later on, you have write `$name' or 14053b57fe0aSwdenk `${name}'; to execute the contents of a variable 14063b57fe0aSwdenk directly type `$name' at the command prompt. 1407c609719bSwdenk 1408c609719bSwdenk Global environment variables are those you use 1409c609719bSwdenk setenv/printenv to work with. To run a command stored 1410c609719bSwdenk in such a variable, you need to use the run command, 1411c609719bSwdenk and you must not use the '$' sign to access them. 1412c609719bSwdenk 1413c609719bSwdenk To store commands and special characters in a 1414c609719bSwdenk variable, please use double quotation marks 1415c609719bSwdenk surrounding the whole text of the variable, instead 1416c609719bSwdenk of the backslashes before semicolons and special 1417c609719bSwdenk symbols. 1418c609719bSwdenk 1419a8c7c708Swdenk- Default Environment: 1420c609719bSwdenk CONFIG_EXTRA_ENV_SETTINGS 1421c609719bSwdenk 1422c609719bSwdenk Define this to contain any number of null terminated 1423c609719bSwdenk strings (variable = value pairs) that will be part of 14247152b1d0Swdenk the default environment compiled into the boot image. 14252262cfeeSwdenk 1426c609719bSwdenk For example, place something like this in your 1427c609719bSwdenk board's config file: 1428c609719bSwdenk 1429c609719bSwdenk #define CONFIG_EXTRA_ENV_SETTINGS \ 1430c609719bSwdenk "myvar1=value1\0" \ 1431c609719bSwdenk "myvar2=value2\0" 1432c609719bSwdenk 1433c609719bSwdenk Warning: This method is based on knowledge about the 1434c609719bSwdenk internal format how the environment is stored by the 14352262cfeeSwdenk U-Boot code. This is NOT an official, exported 1436c609719bSwdenk interface! Although it is unlikely that this format 14377152b1d0Swdenk will change soon, there is no guarantee either. 1438c609719bSwdenk You better know what you are doing here. 1439c609719bSwdenk 1440c609719bSwdenk Note: overly (ab)use of the default environment is 1441c609719bSwdenk discouraged. Make sure to check other ways to preset 1442c609719bSwdenk the environment like the autoscript function or the 1443c609719bSwdenk boot command first. 1444c609719bSwdenk 1445a8c7c708Swdenk- DataFlash Support: 14462abbe075Swdenk CONFIG_HAS_DATAFLASH 14472abbe075Swdenk 14482abbe075Swdenk Defining this option enables DataFlash features and 14492abbe075Swdenk allows to read/write in Dataflash via the standard 14502abbe075Swdenk commands cp, md... 14512abbe075Swdenk 14523f85ce27Swdenk- SystemACE Support: 14533f85ce27Swdenk CONFIG_SYSTEMACE 14543f85ce27Swdenk 14553f85ce27Swdenk Adding this option adds support for Xilinx SystemACE 14563f85ce27Swdenk chips attached via some sort of local bus. The address 14573f85ce27Swdenk of the chip must alsh be defined in the 14583f85ce27Swdenk CFG_SYSTEMACE_BASE macro. For example: 14593f85ce27Swdenk 14603f85ce27Swdenk #define CONFIG_SYSTEMACE 14613f85ce27Swdenk #define CFG_SYSTEMACE_BASE 0xf0000000 14623f85ce27Swdenk 14633f85ce27Swdenk When SystemACE support is added, the "ace" device type 14643f85ce27Swdenk becomes available to the fat commands, i.e. fatls. 14653f85ce27Swdenk 1466a8c7c708Swdenk- Show boot progress: 1467c609719bSwdenk CONFIG_SHOW_BOOT_PROGRESS 1468c609719bSwdenk 1469c609719bSwdenk Defining this option allows to add some board- 1470c609719bSwdenk specific code (calling a user-provided function 1471c609719bSwdenk "show_boot_progress(int)") that enables you to show 1472c609719bSwdenk the system's boot progress on some display (for 1473c609719bSwdenk example, some LED's) on your board. At the moment, 1474c609719bSwdenk the following checkpoints are implemented: 1475c609719bSwdenk 1476c609719bSwdenk Arg Where When 1477c609719bSwdenk 1 common/cmd_bootm.c before attempting to boot an image 1478c609719bSwdenk -1 common/cmd_bootm.c Image header has bad magic number 1479c609719bSwdenk 2 common/cmd_bootm.c Image header has correct magic number 1480c609719bSwdenk -2 common/cmd_bootm.c Image header has bad checksum 1481c609719bSwdenk 3 common/cmd_bootm.c Image header has correct checksum 1482c609719bSwdenk -3 common/cmd_bootm.c Image data has bad checksum 1483c609719bSwdenk 4 common/cmd_bootm.c Image data has correct checksum 1484c609719bSwdenk -4 common/cmd_bootm.c Image is for unsupported architecture 1485c609719bSwdenk 5 common/cmd_bootm.c Architecture check OK 1486c609719bSwdenk -5 common/cmd_bootm.c Wrong Image Type (not kernel, multi, standalone) 1487c609719bSwdenk 6 common/cmd_bootm.c Image Type check OK 1488c609719bSwdenk -6 common/cmd_bootm.c gunzip uncompression error 1489c609719bSwdenk -7 common/cmd_bootm.c Unimplemented compression type 1490c609719bSwdenk 7 common/cmd_bootm.c Uncompression OK 1491c609719bSwdenk -8 common/cmd_bootm.c Wrong Image Type (not kernel, multi, standalone) 1492c609719bSwdenk 8 common/cmd_bootm.c Image Type check OK 1493c609719bSwdenk -9 common/cmd_bootm.c Unsupported OS (not Linux, BSD, VxWorks, QNX) 1494c609719bSwdenk 9 common/cmd_bootm.c Start initial ramdisk verification 1495c609719bSwdenk -10 common/cmd_bootm.c Ramdisk header has bad magic number 1496c609719bSwdenk -11 common/cmd_bootm.c Ramdisk header has bad checksum 1497c609719bSwdenk 10 common/cmd_bootm.c Ramdisk header is OK 1498c609719bSwdenk -12 common/cmd_bootm.c Ramdisk data has bad checksum 1499c609719bSwdenk 11 common/cmd_bootm.c Ramdisk data has correct checksum 1500c609719bSwdenk 12 common/cmd_bootm.c Ramdisk verification complete, start loading 1501c609719bSwdenk -13 common/cmd_bootm.c Wrong Image Type (not PPC Linux Ramdisk) 1502c609719bSwdenk 13 common/cmd_bootm.c Start multifile image verification 1503c609719bSwdenk 14 common/cmd_bootm.c No initial ramdisk, no multifile, continue. 1504c609719bSwdenk 15 common/cmd_bootm.c All preparation done, transferring control to OS 1505c609719bSwdenk 150663e73c9aSwdenk -30 lib_ppc/board.c Fatal error, hang the system 150763e73c9aSwdenk -31 post/post.c POST test failed, detected by post_output_backlog() 150863e73c9aSwdenk -32 post/post.c POST test failed, detected by post_run_single() 150963e73c9aSwdenk 1510c609719bSwdenk -1 common/cmd_doc.c Bad usage of "doc" command 1511c609719bSwdenk -1 common/cmd_doc.c No boot device 1512c609719bSwdenk -1 common/cmd_doc.c Unknown Chip ID on boot device 1513c609719bSwdenk -1 common/cmd_doc.c Read Error on boot device 1514c609719bSwdenk -1 common/cmd_doc.c Image header has bad magic number 1515c609719bSwdenk 1516c609719bSwdenk -1 common/cmd_ide.c Bad usage of "ide" command 1517c609719bSwdenk -1 common/cmd_ide.c No boot device 1518c609719bSwdenk -1 common/cmd_ide.c Unknown boot device 1519c609719bSwdenk -1 common/cmd_ide.c Unknown partition table 1520c609719bSwdenk -1 common/cmd_ide.c Invalid partition type 1521c609719bSwdenk -1 common/cmd_ide.c Read Error on boot device 1522c609719bSwdenk -1 common/cmd_ide.c Image header has bad magic number 1523c609719bSwdenk 1524206c60cbSwdenk -1 common/cmd_nand.c Bad usage of "nand" command 1525206c60cbSwdenk -1 common/cmd_nand.c No boot device 1526206c60cbSwdenk -1 common/cmd_nand.c Unknown Chip ID on boot device 1527206c60cbSwdenk -1 common/cmd_nand.c Read Error on boot device 1528206c60cbSwdenk -1 common/cmd_nand.c Image header has bad magic number 1529206c60cbSwdenk 1530206c60cbSwdenk -1 common/env_common.c Environment has a bad CRC, using default 1531c609719bSwdenk 1532c609719bSwdenk 1533c609719bSwdenkModem Support: 1534c609719bSwdenk-------------- 1535c609719bSwdenk 153685ec0bccSwdenk[so far only for SMDK2400 and TRAB boards] 1537c609719bSwdenk 1538c609719bSwdenk- Modem support endable: 1539c609719bSwdenk CONFIG_MODEM_SUPPORT 1540c609719bSwdenk 1541c609719bSwdenk- RTS/CTS Flow control enable: 1542c609719bSwdenk CONFIG_HWFLOW 1543c609719bSwdenk 1544c609719bSwdenk- Modem debug support: 1545c609719bSwdenk CONFIG_MODEM_SUPPORT_DEBUG 1546c609719bSwdenk 1547c609719bSwdenk Enables debugging stuff (char screen[1024], dbg()) 1548c609719bSwdenk for modem support. Useful only with BDI2000. 1549c609719bSwdenk 1550a8c7c708Swdenk- Interrupt support (PPC): 1551a8c7c708Swdenk 1552a8c7c708Swdenk There are common interrupt_init() and timer_interrupt() 1553a8c7c708Swdenk for all PPC archs. interrupt_init() calls interrupt_init_cpu() 1554a8c7c708Swdenk for cpu specific initialization. interrupt_init_cpu() 1555a8c7c708Swdenk should set decrementer_count to appropriate value. If 1556a8c7c708Swdenk cpu resets decrementer automatically after interrupt 1557a8c7c708Swdenk (ppc4xx) it should set decrementer_count to zero. 1558a8c7c708Swdenk timer_interrupt() calls timer_interrupt_cpu() for cpu 1559a8c7c708Swdenk specific handling. If board has watchdog / status_led 1560a8c7c708Swdenk / other_activity_monitor it works automatically from 1561a8c7c708Swdenk general timer_interrupt(). 1562a8c7c708Swdenk 1563c609719bSwdenk- General: 1564c609719bSwdenk 1565c609719bSwdenk In the target system modem support is enabled when a 1566c609719bSwdenk specific key (key combination) is pressed during 1567c609719bSwdenk power-on. Otherwise U-Boot will boot normally 1568c609719bSwdenk (autoboot). The key_pressed() fuction is called from 1569c609719bSwdenk board_init(). Currently key_pressed() is a dummy 1570c609719bSwdenk function, returning 1 and thus enabling modem 1571c609719bSwdenk initialization. 1572c609719bSwdenk 1573c609719bSwdenk If there are no modem init strings in the 1574c609719bSwdenk environment, U-Boot proceed to autoboot; the 1575c609719bSwdenk previous output (banner, info printfs) will be 1576c609719bSwdenk supressed, though. 1577c609719bSwdenk 1578c609719bSwdenk See also: doc/README.Modem 1579c609719bSwdenk 1580c609719bSwdenk 1581c609719bSwdenkConfiguration Settings: 1582c609719bSwdenk----------------------- 1583c609719bSwdenk 1584c609719bSwdenk- CFG_LONGHELP: Defined when you want long help messages included; 1585c609719bSwdenk undefine this when you're short of memory. 1586c609719bSwdenk 1587c609719bSwdenk- CFG_PROMPT: This is what U-Boot prints on the console to 1588c609719bSwdenk prompt for user input. 1589c609719bSwdenk 1590c609719bSwdenk- CFG_CBSIZE: Buffer size for input from the Console 1591c609719bSwdenk 1592c609719bSwdenk- CFG_PBSIZE: Buffer size for Console output 1593c609719bSwdenk 1594c609719bSwdenk- CFG_MAXARGS: max. Number of arguments accepted for monitor commands 1595c609719bSwdenk 1596c609719bSwdenk- CFG_BARGSIZE: Buffer size for Boot Arguments which are passed to 1597c609719bSwdenk the application (usually a Linux kernel) when it is 1598c609719bSwdenk booted 1599c609719bSwdenk 1600c609719bSwdenk- CFG_BAUDRATE_TABLE: 1601c609719bSwdenk List of legal baudrate settings for this board. 1602c609719bSwdenk 1603c609719bSwdenk- CFG_CONSOLE_INFO_QUIET 1604c609719bSwdenk Suppress display of console information at boot. 1605c609719bSwdenk 1606c609719bSwdenk- CFG_CONSOLE_IS_IN_ENV 1607c609719bSwdenk If the board specific function 1608c609719bSwdenk extern int overwrite_console (void); 1609c609719bSwdenk returns 1, the stdin, stderr and stdout are switched to the 1610c609719bSwdenk serial port, else the settings in the environment are used. 1611c609719bSwdenk 1612c609719bSwdenk- CFG_CONSOLE_OVERWRITE_ROUTINE 1613c609719bSwdenk Enable the call to overwrite_console(). 1614c609719bSwdenk 1615c609719bSwdenk- CFG_CONSOLE_ENV_OVERWRITE 1616c609719bSwdenk Enable overwrite of previous console environment settings. 1617c609719bSwdenk 1618c609719bSwdenk- CFG_MEMTEST_START, CFG_MEMTEST_END: 1619c609719bSwdenk Begin and End addresses of the area used by the 1620c609719bSwdenk simple memory test. 1621c609719bSwdenk 1622c609719bSwdenk- CFG_ALT_MEMTEST: 1623c609719bSwdenk Enable an alternate, more extensive memory test. 1624c609719bSwdenk 16255f535fe1Swdenk- CFG_MEMTEST_SCRATCH: 16265f535fe1Swdenk Scratch address used by the alternate memory test 16275f535fe1Swdenk You only need to set this if address zero isn't writeable 16285f535fe1Swdenk 1629c609719bSwdenk- CFG_TFTP_LOADADDR: 1630c609719bSwdenk Default load address for network file downloads 1631c609719bSwdenk 1632c609719bSwdenk- CFG_LOADS_BAUD_CHANGE: 1633c609719bSwdenk Enable temporary baudrate change while serial download 1634c609719bSwdenk 1635c609719bSwdenk- CFG_SDRAM_BASE: 1636c609719bSwdenk Physical start address of SDRAM. _Must_ be 0 here. 1637c609719bSwdenk 1638c609719bSwdenk- CFG_MBIO_BASE: 1639c609719bSwdenk Physical start address of Motherboard I/O (if using a 1640c609719bSwdenk Cogent motherboard) 1641c609719bSwdenk 1642c609719bSwdenk- CFG_FLASH_BASE: 1643c609719bSwdenk Physical start address of Flash memory. 1644c609719bSwdenk 1645c609719bSwdenk- CFG_MONITOR_BASE: 1646c609719bSwdenk Physical start address of boot monitor code (set by 1647c609719bSwdenk make config files to be same as the text base address 1648c609719bSwdenk (TEXT_BASE) used when linking) - same as 1649c609719bSwdenk CFG_FLASH_BASE when booting from flash. 1650c609719bSwdenk 1651c609719bSwdenk- CFG_MONITOR_LEN: 16523b57fe0aSwdenk Size of memory reserved for monitor code, used to 16533b57fe0aSwdenk determine _at_compile_time_ (!) if the environment is 16543b57fe0aSwdenk embedded within the U-Boot image, or in a separate 16553b57fe0aSwdenk flash sector. 1656c609719bSwdenk 1657c609719bSwdenk- CFG_MALLOC_LEN: 1658c609719bSwdenk Size of DRAM reserved for malloc() use. 1659c609719bSwdenk 1660c609719bSwdenk- CFG_BOOTMAPSZ: 1661c609719bSwdenk Maximum size of memory mapped by the startup code of 1662c609719bSwdenk the Linux kernel; all data that must be processed by 1663c609719bSwdenk the Linux kernel (bd_info, boot arguments, eventually 1664c609719bSwdenk initrd image) must be put below this limit. 1665c609719bSwdenk 1666c609719bSwdenk- CFG_MAX_FLASH_BANKS: 1667c609719bSwdenk Max number of Flash memory banks 1668c609719bSwdenk 1669c609719bSwdenk- CFG_MAX_FLASH_SECT: 1670c609719bSwdenk Max number of sectors on a Flash chip 1671c609719bSwdenk 1672c609719bSwdenk- CFG_FLASH_ERASE_TOUT: 1673c609719bSwdenk Timeout for Flash erase operations (in ms) 1674c609719bSwdenk 1675c609719bSwdenk- CFG_FLASH_WRITE_TOUT: 1676c609719bSwdenk Timeout for Flash write operations (in ms) 1677c609719bSwdenk 16788564acf9Swdenk- CFG_FLASH_LOCK_TOUT 16798564acf9Swdenk Timeout for Flash set sector lock bit operation (in ms) 16808564acf9Swdenk 16818564acf9Swdenk- CFG_FLASH_UNLOCK_TOUT 16828564acf9Swdenk Timeout for Flash clear lock bits operation (in ms) 16838564acf9Swdenk 16848564acf9Swdenk- CFG_FLASH_PROTECTION 16858564acf9Swdenk If defined, hardware flash sectors protection is used 16868564acf9Swdenk instead of U-Boot software protection. 16878564acf9Swdenk 1688c609719bSwdenk- CFG_DIRECT_FLASH_TFTP: 1689c609719bSwdenk 1690c609719bSwdenk Enable TFTP transfers directly to flash memory; 1691c609719bSwdenk without this option such a download has to be 1692c609719bSwdenk performed in two steps: (1) download to RAM, and (2) 1693c609719bSwdenk copy from RAM to flash. 1694c609719bSwdenk 1695c609719bSwdenk The two-step approach is usually more reliable, since 1696c609719bSwdenk you can check if the download worked before you erase 1697c609719bSwdenk the flash, but in some situations (when sytem RAM is 1698c609719bSwdenk too limited to allow for a tempory copy of the 1699c609719bSwdenk downloaded image) this option may be very useful. 1700c609719bSwdenk 1701c609719bSwdenk- CFG_FLASH_CFI: 1702c609719bSwdenk Define if the flash driver uses extra elements in the 17035653fc33Swdenk common flash structure for storing flash geometry. 17045653fc33Swdenk 17055653fc33Swdenk- CFG_FLASH_CFI_DRIVER 17065653fc33Swdenk This option also enables the building of the cfi_flash driver 17075653fc33Swdenk in the drivers directory 170853cf9435Sstroese 170953cf9435Sstroese- CFG_RX_ETH_BUFFER: 171053cf9435Sstroese Defines the number of ethernet receive buffers. On some 171153cf9435Sstroese ethernet controllers it is recommended to set this value 171253cf9435Sstroese to 8 or even higher (EEPRO100 or 405 EMAC), since all 171353cf9435Sstroese buffers can be full shortly after enabling the interface 171453cf9435Sstroese on high ethernet traffic. 171553cf9435Sstroese Defaults to 4 if not defined. 1716c609719bSwdenk 1717c609719bSwdenkThe following definitions that deal with the placement and management 1718c609719bSwdenkof environment data (variable area); in general, we support the 1719c609719bSwdenkfollowing configurations: 1720c609719bSwdenk 1721c609719bSwdenk- CFG_ENV_IS_IN_FLASH: 1722c609719bSwdenk 1723c609719bSwdenk Define this if the environment is in flash memory. 1724c609719bSwdenk 1725c609719bSwdenk a) The environment occupies one whole flash sector, which is 1726c609719bSwdenk "embedded" in the text segment with the U-Boot code. This 1727c609719bSwdenk happens usually with "bottom boot sector" or "top boot 1728c609719bSwdenk sector" type flash chips, which have several smaller 1729c609719bSwdenk sectors at the start or the end. For instance, such a 1730c609719bSwdenk layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In 1731c609719bSwdenk such a case you would place the environment in one of the 1732c609719bSwdenk 4 kB sectors - with U-Boot code before and after it. With 1733c609719bSwdenk "top boot sector" type flash chips, you would put the 1734c609719bSwdenk environment in one of the last sectors, leaving a gap 1735c609719bSwdenk between U-Boot and the environment. 1736c609719bSwdenk 1737c609719bSwdenk - CFG_ENV_OFFSET: 1738c609719bSwdenk 1739c609719bSwdenk Offset of environment data (variable area) to the 1740c609719bSwdenk beginning of flash memory; for instance, with bottom boot 1741c609719bSwdenk type flash chips the second sector can be used: the offset 1742c609719bSwdenk for this sector is given here. 1743c609719bSwdenk 1744c609719bSwdenk CFG_ENV_OFFSET is used relative to CFG_FLASH_BASE. 1745c609719bSwdenk 1746c609719bSwdenk - CFG_ENV_ADDR: 1747c609719bSwdenk 1748c609719bSwdenk This is just another way to specify the start address of 1749c609719bSwdenk the flash sector containing the environment (instead of 1750c609719bSwdenk CFG_ENV_OFFSET). 1751c609719bSwdenk 1752c609719bSwdenk - CFG_ENV_SECT_SIZE: 1753c609719bSwdenk 1754c609719bSwdenk Size of the sector containing the environment. 1755c609719bSwdenk 1756c609719bSwdenk 1757c609719bSwdenk b) Sometimes flash chips have few, equal sized, BIG sectors. 1758c609719bSwdenk In such a case you don't want to spend a whole sector for 1759c609719bSwdenk the environment. 1760c609719bSwdenk 1761c609719bSwdenk - CFG_ENV_SIZE: 1762c609719bSwdenk 1763c609719bSwdenk If you use this in combination with CFG_ENV_IS_IN_FLASH 1764c609719bSwdenk and CFG_ENV_SECT_SIZE, you can specify to use only a part 1765c609719bSwdenk of this flash sector for the environment. This saves 1766c609719bSwdenk memory for the RAM copy of the environment. 1767c609719bSwdenk 1768c609719bSwdenk It may also save flash memory if you decide to use this 1769c609719bSwdenk when your environment is "embedded" within U-Boot code, 1770c609719bSwdenk since then the remainder of the flash sector could be used 1771c609719bSwdenk for U-Boot code. It should be pointed out that this is 1772c609719bSwdenk STRONGLY DISCOURAGED from a robustness point of view: 1773c609719bSwdenk updating the environment in flash makes it always 1774c609719bSwdenk necessary to erase the WHOLE sector. If something goes 1775c609719bSwdenk wrong before the contents has been restored from a copy in 1776c609719bSwdenk RAM, your target system will be dead. 1777c609719bSwdenk 1778c609719bSwdenk - CFG_ENV_ADDR_REDUND 1779c609719bSwdenk CFG_ENV_SIZE_REDUND 1780c609719bSwdenk 1781c609719bSwdenk These settings describe a second storage area used to hold 1782c609719bSwdenk a redundand copy of the environment data, so that there is 17833e38691eSwdenk a valid backup copy in case there is a power failure during 1784c609719bSwdenk a "saveenv" operation. 1785c609719bSwdenk 1786c609719bSwdenkBE CAREFUL! Any changes to the flash layout, and some changes to the 1787c609719bSwdenksource code will make it necessary to adapt <board>/u-boot.lds* 1788c609719bSwdenkaccordingly! 1789c609719bSwdenk 1790c609719bSwdenk 1791c609719bSwdenk- CFG_ENV_IS_IN_NVRAM: 1792c609719bSwdenk 1793c609719bSwdenk Define this if you have some non-volatile memory device 1794c609719bSwdenk (NVRAM, battery buffered SRAM) which you want to use for the 1795c609719bSwdenk environment. 1796c609719bSwdenk 1797c609719bSwdenk - CFG_ENV_ADDR: 1798c609719bSwdenk - CFG_ENV_SIZE: 1799c609719bSwdenk 1800c609719bSwdenk These two #defines are used to determin the memory area you 1801c609719bSwdenk want to use for environment. It is assumed that this memory 1802c609719bSwdenk can just be read and written to, without any special 1803c609719bSwdenk provision. 1804c609719bSwdenk 1805c609719bSwdenkBE CAREFUL! The first access to the environment happens quite early 1806c609719bSwdenkin U-Boot initalization (when we try to get the setting of for the 1807c609719bSwdenkconsole baudrate). You *MUST* have mappend your NVRAM area then, or 1808c609719bSwdenkU-Boot will hang. 1809c609719bSwdenk 1810c609719bSwdenkPlease note that even with NVRAM we still use a copy of the 1811c609719bSwdenkenvironment in RAM: we could work on NVRAM directly, but we want to 1812c609719bSwdenkkeep settings there always unmodified except somebody uses "saveenv" 1813c609719bSwdenkto save the current settings. 1814c609719bSwdenk 1815c609719bSwdenk 1816c609719bSwdenk- CFG_ENV_IS_IN_EEPROM: 1817c609719bSwdenk 1818c609719bSwdenk Use this if you have an EEPROM or similar serial access 1819c609719bSwdenk device and a driver for it. 1820c609719bSwdenk 1821c609719bSwdenk - CFG_ENV_OFFSET: 1822c609719bSwdenk - CFG_ENV_SIZE: 1823c609719bSwdenk 1824c609719bSwdenk These two #defines specify the offset and size of the 1825c609719bSwdenk environment area within the total memory of your EEPROM. 1826c609719bSwdenk 1827c609719bSwdenk - CFG_I2C_EEPROM_ADDR: 1828c609719bSwdenk If defined, specified the chip address of the EEPROM device. 1829c609719bSwdenk The default address is zero. 1830c609719bSwdenk 1831c609719bSwdenk - CFG_EEPROM_PAGE_WRITE_BITS: 1832c609719bSwdenk If defined, the number of bits used to address bytes in a 1833c609719bSwdenk single page in the EEPROM device. A 64 byte page, for example 1834c609719bSwdenk would require six bits. 1835c609719bSwdenk 1836c609719bSwdenk - CFG_EEPROM_PAGE_WRITE_DELAY_MS: 1837c609719bSwdenk If defined, the number of milliseconds to delay between 1838c609719bSwdenk page writes. The default is zero milliseconds. 1839c609719bSwdenk 1840c609719bSwdenk - CFG_I2C_EEPROM_ADDR_LEN: 1841c609719bSwdenk The length in bytes of the EEPROM memory array address. Note 1842c609719bSwdenk that this is NOT the chip address length! 1843c609719bSwdenk 18445cf91d6bSwdenk - CFG_I2C_EEPROM_ADDR_OVERFLOW: 18455cf91d6bSwdenk EEPROM chips that implement "address overflow" are ones 18465cf91d6bSwdenk like Catalyst 24WC04/08/16 which has 9/10/11 bits of 18475cf91d6bSwdenk address and the extra bits end up in the "chip address" bit 18485cf91d6bSwdenk slots. This makes a 24WC08 (1Kbyte) chip look like four 256 18495cf91d6bSwdenk byte chips. 18505cf91d6bSwdenk 18515cf91d6bSwdenk Note that we consider the length of the address field to 18525cf91d6bSwdenk still be one byte because the extra address bits are hidden 18535cf91d6bSwdenk in the chip address. 18545cf91d6bSwdenk 1855c609719bSwdenk - CFG_EEPROM_SIZE: 1856c609719bSwdenk The size in bytes of the EEPROM device. 1857c609719bSwdenk 1858c609719bSwdenk 18595779d8d9Swdenk- CFG_ENV_IS_IN_DATAFLASH: 18605779d8d9Swdenk 18615779d8d9Swdenk Define this if you have a DataFlash memory device which you 18625779d8d9Swdenk want to use for the environment. 18635779d8d9Swdenk 18645779d8d9Swdenk - CFG_ENV_OFFSET: 18655779d8d9Swdenk - CFG_ENV_ADDR: 18665779d8d9Swdenk - CFG_ENV_SIZE: 18675779d8d9Swdenk 18685779d8d9Swdenk These three #defines specify the offset and size of the 18695779d8d9Swdenk environment area within the total memory of your DataFlash placed 18705779d8d9Swdenk at the specified address. 18715779d8d9Swdenk 187213a5695bSwdenk- CFG_ENV_IS_IN_NAND: 187313a5695bSwdenk 187413a5695bSwdenk Define this if you have a NAND device which you want to use 187513a5695bSwdenk for the environment. 187613a5695bSwdenk 187713a5695bSwdenk - CFG_ENV_OFFSET: 187813a5695bSwdenk - CFG_ENV_SIZE: 187913a5695bSwdenk 188013a5695bSwdenk These two #defines specify the offset and size of the environment 188113a5695bSwdenk area within the first NAND device. 18825779d8d9Swdenk 1883c609719bSwdenk- CFG_SPI_INIT_OFFSET 1884c609719bSwdenk 1885c609719bSwdenk Defines offset to the initial SPI buffer area in DPRAM. The 1886c609719bSwdenk area is used at an early stage (ROM part) if the environment 1887c609719bSwdenk is configured to reside in the SPI EEPROM: We need a 520 byte 1888c609719bSwdenk scratch DPRAM area. It is used between the two initialization 1889c609719bSwdenk calls (spi_init_f() and spi_init_r()). A value of 0xB00 seems 1890c609719bSwdenk to be a good choice since it makes it far enough from the 1891c609719bSwdenk start of the data area as well as from the stack pointer. 1892c609719bSwdenk 1893c609719bSwdenkPlease note that the environment is read-only as long as the monitor 1894c609719bSwdenkhas been relocated to RAM and a RAM copy of the environment has been 1895c609719bSwdenkcreated; also, when using EEPROM you will have to use getenv_r() 1896c609719bSwdenkuntil then to read environment variables. 1897c609719bSwdenk 189885ec0bccSwdenkThe environment is protected by a CRC32 checksum. Before the monitor 189985ec0bccSwdenkis relocated into RAM, as a result of a bad CRC you will be working 190085ec0bccSwdenkwith the compiled-in default environment - *silently*!!! [This is 190185ec0bccSwdenknecessary, because the first environment variable we need is the 190285ec0bccSwdenk"baudrate" setting for the console - if we have a bad CRC, we don't 190385ec0bccSwdenkhave any device yet where we could complain.] 1904c609719bSwdenk 1905c609719bSwdenkNote: once the monitor has been relocated, then it will complain if 1906c609719bSwdenkthe default environment is used; a new CRC is computed as soon as you 190785ec0bccSwdenkuse the "saveenv" command to store a valid environment. 1908c609719bSwdenk 1909fc3e2165Swdenk- CFG_FAULT_ECHO_LINK_DOWN: 1910fc3e2165Swdenk Echo the inverted Ethernet link state to the fault LED. 1911fc3e2165Swdenk 1912fc3e2165Swdenk Note: If this option is active, then CFG_FAULT_MII_ADDR 1913fc3e2165Swdenk also needs to be defined. 1914fc3e2165Swdenk 1915fc3e2165Swdenk- CFG_FAULT_MII_ADDR: 1916fc3e2165Swdenk MII address of the PHY to check for the Ethernet link state. 1917c609719bSwdenk 1918c40b2956Swdenk- CFG_64BIT_VSPRINTF: 1919c40b2956Swdenk Makes vsprintf (and all *printf functions) support printing 1920c40b2956Swdenk of 64bit values by using the L quantifier 1921c40b2956Swdenk 1922c40b2956Swdenk- CFG_64BIT_STRTOUL: 1923c40b2956Swdenk Adds simple_strtoull that returns a 64bit value 1924c40b2956Swdenk 1925c609719bSwdenkLow Level (hardware related) configuration options: 1926dc7c9a1aSwdenk--------------------------------------------------- 1927c609719bSwdenk 1928c609719bSwdenk- CFG_CACHELINE_SIZE: 1929c609719bSwdenk Cache Line Size of the CPU. 1930c609719bSwdenk 1931c609719bSwdenk- CFG_DEFAULT_IMMR: 1932c609719bSwdenk Default address of the IMMR after system reset. 19332535d602Swdenk 19342535d602Swdenk Needed on some 8260 systems (MPC8260ADS, PQ2FADS-ZU, 19352535d602Swdenk and RPXsuper) to be able to adjust the position of 19362535d602Swdenk the IMMR register after a reset. 1937c609719bSwdenk 19387f6c2cbcSwdenk- Floppy Disk Support: 19397f6c2cbcSwdenk CFG_FDC_DRIVE_NUMBER 19407f6c2cbcSwdenk 19417f6c2cbcSwdenk the default drive number (default value 0) 19427f6c2cbcSwdenk 19437f6c2cbcSwdenk CFG_ISA_IO_STRIDE 19447f6c2cbcSwdenk 19457f6c2cbcSwdenk defines the spacing between fdc chipset registers 19467f6c2cbcSwdenk (default value 1) 19477f6c2cbcSwdenk 19487f6c2cbcSwdenk CFG_ISA_IO_OFFSET 19497f6c2cbcSwdenk 19507f6c2cbcSwdenk defines the offset of register from address. It 19517f6c2cbcSwdenk depends on which part of the data bus is connected to 19527f6c2cbcSwdenk the fdc chipset. (default value 0) 19537f6c2cbcSwdenk 19547f6c2cbcSwdenk If CFG_ISA_IO_STRIDE CFG_ISA_IO_OFFSET and 19557f6c2cbcSwdenk CFG_FDC_DRIVE_NUMBER are undefined, they take their 19567f6c2cbcSwdenk default value. 19577f6c2cbcSwdenk 19587f6c2cbcSwdenk if CFG_FDC_HW_INIT is defined, then the function 19597f6c2cbcSwdenk fdc_hw_init() is called at the beginning of the FDC 19607f6c2cbcSwdenk setup. fdc_hw_init() must be provided by the board 19617f6c2cbcSwdenk source code. It is used to make hardware dependant 19627f6c2cbcSwdenk initializations. 19637f6c2cbcSwdenk 1964c609719bSwdenk- CFG_IMMR: Physical address of the Internal Memory Mapped 1965c609719bSwdenk Register; DO NOT CHANGE! (11-4) 1966c609719bSwdenk [MPC8xx systems only] 1967c609719bSwdenk 1968c609719bSwdenk- CFG_INIT_RAM_ADDR: 1969c609719bSwdenk 19707152b1d0Swdenk Start address of memory area that can be used for 1971c609719bSwdenk initial data and stack; please note that this must be 1972c609719bSwdenk writable memory that is working WITHOUT special 1973c609719bSwdenk initialization, i. e. you CANNOT use normal RAM which 1974c609719bSwdenk will become available only after programming the 1975c609719bSwdenk memory controller and running certain initialization 1976c609719bSwdenk sequences. 1977c609719bSwdenk 1978c609719bSwdenk U-Boot uses the following memory types: 1979c609719bSwdenk - MPC8xx and MPC8260: IMMR (internal memory of the CPU) 1980c609719bSwdenk - MPC824X: data cache 1981c609719bSwdenk - PPC4xx: data cache 1982c609719bSwdenk 198385ec0bccSwdenk- CFG_GBL_DATA_OFFSET: 1984c609719bSwdenk 1985c609719bSwdenk Offset of the initial data structure in the memory 1986c609719bSwdenk area defined by CFG_INIT_RAM_ADDR. Usually 198785ec0bccSwdenk CFG_GBL_DATA_OFFSET is chosen such that the initial 1988c609719bSwdenk data is located at the end of the available space 1989c609719bSwdenk (sometimes written as (CFG_INIT_RAM_END - 1990c609719bSwdenk CFG_INIT_DATA_SIZE), and the initial stack is just 1991c609719bSwdenk below that area (growing from (CFG_INIT_RAM_ADDR + 199285ec0bccSwdenk CFG_GBL_DATA_OFFSET) downward. 1993c609719bSwdenk 1994c609719bSwdenk Note: 1995c609719bSwdenk On the MPC824X (or other systems that use the data 1996c609719bSwdenk cache for initial memory) the address chosen for 1997c609719bSwdenk CFG_INIT_RAM_ADDR is basically arbitrary - it must 1998c609719bSwdenk point to an otherwise UNUSED address space between 1999c609719bSwdenk the top of RAM and the start of the PCI space. 2000c609719bSwdenk 2001c609719bSwdenk- CFG_SIUMCR: SIU Module Configuration (11-6) 2002c609719bSwdenk 2003c609719bSwdenk- CFG_SYPCR: System Protection Control (11-9) 2004c609719bSwdenk 2005c609719bSwdenk- CFG_TBSCR: Time Base Status and Control (11-26) 2006c609719bSwdenk 2007c609719bSwdenk- CFG_PISCR: Periodic Interrupt Status and Control (11-31) 2008c609719bSwdenk 2009c609719bSwdenk- CFG_PLPRCR: PLL, Low-Power, and Reset Control Register (15-30) 2010c609719bSwdenk 2011c609719bSwdenk- CFG_SCCR: System Clock and reset Control Register (15-27) 2012c609719bSwdenk 2013c609719bSwdenk- CFG_OR_TIMING_SDRAM: 2014c609719bSwdenk SDRAM timing 2015c609719bSwdenk 2016c609719bSwdenk- CFG_MAMR_PTA: 2017c609719bSwdenk periodic timer for refresh 2018c609719bSwdenk 2019c609719bSwdenk- CFG_DER: Debug Event Register (37-47) 2020c609719bSwdenk 2021c609719bSwdenk- FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CFG_REMAP_OR_AM, 2022c609719bSwdenk CFG_PRELIM_OR_AM, CFG_OR_TIMING_FLASH, CFG_OR0_REMAP, 2023c609719bSwdenk CFG_OR0_PRELIM, CFG_BR0_PRELIM, CFG_OR1_REMAP, CFG_OR1_PRELIM, 2024c609719bSwdenk CFG_BR1_PRELIM: 2025c609719bSwdenk Memory Controller Definitions: BR0/1 and OR0/1 (FLASH) 2026c609719bSwdenk 2027c609719bSwdenk- SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE, 2028c609719bSwdenk CFG_OR_TIMING_SDRAM, CFG_OR2_PRELIM, CFG_BR2_PRELIM, 2029c609719bSwdenk CFG_OR3_PRELIM, CFG_BR3_PRELIM: 2030c609719bSwdenk Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM) 2031c609719bSwdenk 2032c609719bSwdenk- CFG_MAMR_PTA, CFG_MPTPR_2BK_4K, CFG_MPTPR_1BK_4K, CFG_MPTPR_2BK_8K, 2033c609719bSwdenk CFG_MPTPR_1BK_8K, CFG_MAMR_8COL, CFG_MAMR_9COL: 2034c609719bSwdenk Machine Mode Register and Memory Periodic Timer 2035c609719bSwdenk Prescaler definitions (SDRAM timing) 2036c609719bSwdenk 2037c609719bSwdenk- CFG_I2C_UCODE_PATCH, CFG_I2C_DPMEM_OFFSET [0x1FC0]: 2038c609719bSwdenk enable I2C microcode relocation patch (MPC8xx); 2039c609719bSwdenk define relocation offset in DPRAM [DSP2] 2040c609719bSwdenk 2041c609719bSwdenk- CFG_SPI_UCODE_PATCH, CFG_SPI_DPMEM_OFFSET [0x1FC0]: 2042c609719bSwdenk enable SPI microcode relocation patch (MPC8xx); 2043c609719bSwdenk define relocation offset in DPRAM [SCC4] 2044c609719bSwdenk 2045c609719bSwdenk- CFG_USE_OSCCLK: 2046c609719bSwdenk Use OSCM clock mode on MBX8xx board. Be careful, 2047c609719bSwdenk wrong setting might damage your board. Read 2048c609719bSwdenk doc/README.MBX before setting this variable! 2049c609719bSwdenk 2050ea909b76Swdenk- CFG_CPM_POST_WORD_ADDR: (MPC8xx, MPC8260 only) 2051ea909b76Swdenk Offset of the bootmode word in DPRAM used by post 2052ea909b76Swdenk (Power On Self Tests). This definition overrides 2053ea909b76Swdenk #define'd default value in commproc.h resp. 2054ea909b76Swdenk cpm_8260.h. 2055ea909b76Swdenk 20565d232d0eSwdenk- CFG_PCI_SLV_MEM_LOCAL, CFG_PCI_SLV_MEM_BUS, CFG_PICMR0_MASK_ATTRIB, 20575d232d0eSwdenk CFG_PCI_MSTR0_LOCAL, CFG_PCIMSK0_MASK, CFG_PCI_MSTR1_LOCAL, 20585d232d0eSwdenk CFG_PCIMSK1_MASK, CFG_PCI_MSTR_MEM_LOCAL, CFG_PCI_MSTR_MEM_BUS, 20595d232d0eSwdenk CFG_CPU_PCI_MEM_START, CFG_PCI_MSTR_MEM_SIZE, CFG_POCMR0_MASK_ATTRIB, 20605d232d0eSwdenk CFG_PCI_MSTR_MEMIO_LOCAL, CFG_PCI_MSTR_MEMIO_BUS, CPU_PCI_MEMIO_START, 20615d232d0eSwdenk CFG_PCI_MSTR_MEMIO_SIZE, CFG_POCMR1_MASK_ATTRIB, CFG_PCI_MSTR_IO_LOCAL, 20625d232d0eSwdenk CFG_PCI_MSTR_IO_BUS, CFG_CPU_PCI_IO_START, CFG_PCI_MSTR_IO_SIZE, 20635d232d0eSwdenk CFG_POCMR2_MASK_ATTRIB: (MPC826x only) 20645d232d0eSwdenk Overrides the default PCI memory map in cpu/mpc8260/pci.c if set. 20655d232d0eSwdenk 2066c26e454dSwdenk- CONFIG_ETHER_ON_FEC[12] 2067c26e454dSwdenk Define to enable FEC[12] on a 8xx series processor. 2068c26e454dSwdenk 2069c26e454dSwdenk- CONFIG_FEC[12]_PHY 2070c26e454dSwdenk Define to the hardcoded PHY address which corresponds 20716e592385Swdenk to the given FEC; i. e. 2072c26e454dSwdenk #define CONFIG_FEC1_PHY 4 2073c26e454dSwdenk means that the PHY with address 4 is connected to FEC1 2074c26e454dSwdenk 2075c26e454dSwdenk When set to -1, means to probe for first available. 2076c26e454dSwdenk 2077c26e454dSwdenk- CONFIG_FEC[12]_PHY_NORXERR 2078c26e454dSwdenk The PHY does not have a RXERR line (RMII only). 2079c26e454dSwdenk (so program the FEC to ignore it). 2080c26e454dSwdenk 2081c26e454dSwdenk- CONFIG_RMII 2082c26e454dSwdenk Enable RMII mode for all FECs. 2083c26e454dSwdenk Note that this is a global option, we can't 2084c26e454dSwdenk have one FEC in standard MII mode and another in RMII mode. 2085c26e454dSwdenk 20865cf91d6bSwdenk- CONFIG_CRC32_VERIFY 20875cf91d6bSwdenk Add a verify option to the crc32 command. 20885cf91d6bSwdenk The syntax is: 20895cf91d6bSwdenk 20905cf91d6bSwdenk => crc32 -v <address> <count> <crc32> 20915cf91d6bSwdenk 20925cf91d6bSwdenk Where address/count indicate a memory area 20935cf91d6bSwdenk and crc32 is the correct crc32 which the 20945cf91d6bSwdenk area should have. 20955cf91d6bSwdenk 209656523f12Swdenk- CONFIG_LOOPW 209756523f12Swdenk Add the "loopw" memory command. This only takes effect if 209856523f12Swdenk the memory commands are activated globally (CFG_CMD_MEM). 209956523f12Swdenk 2100c609719bSwdenkBuilding the Software: 2101c609719bSwdenk====================== 2102c609719bSwdenk 2103c609719bSwdenkBuilding U-Boot has been tested in native PPC environments (on a 2104c609719bSwdenkPowerBook G3 running LinuxPPC 2000) and in cross environments 2105c609719bSwdenk(running RedHat 6.x and 7.x Linux on x86, Solaris 2.6 on a SPARC, and 2106c609719bSwdenkNetBSD 1.5 on x86). 2107c609719bSwdenk 2108c609719bSwdenkIf you are not using a native PPC environment, it is assumed that you 2109c609719bSwdenkhave the GNU cross compiling tools available in your path and named 2110c609719bSwdenkwith a prefix of "powerpc-linux-". If this is not the case, (e.g. if 2111c609719bSwdenkyou are using Monta Vista's Hard Hat Linux CDK 1.2) you must change 2112c609719bSwdenkthe definition of CROSS_COMPILE in Makefile. For HHL on a 4xx CPU, 2113c609719bSwdenkchange it to: 2114c609719bSwdenk 2115c609719bSwdenk CROSS_COMPILE = ppc_4xx- 2116c609719bSwdenk 2117c609719bSwdenk 2118c609719bSwdenkU-Boot is intended to be simple to build. After installing the 2119c609719bSwdenksources you must configure U-Boot for one specific board type. This 2120c609719bSwdenkis done by typing: 2121c609719bSwdenk 2122c609719bSwdenk make NAME_config 2123c609719bSwdenk 2124c609719bSwdenkwhere "NAME_config" is the name of one of the existing 2125c609719bSwdenkconfigurations; the following names are supported: 2126c609719bSwdenk 21271eaeb58eSwdenk ADCIOP_config FPS860L_config omap730p2_config 21281eaeb58eSwdenk ADS860_config GEN860T_config pcu_e_config 21291eaeb58eSwdenk AR405_config GENIETV_config PIP405_config 21301eaeb58eSwdenk at91rm9200dk_config GTH_config QS823_config 21311eaeb58eSwdenk CANBT_config hermes_config QS850_config 21321eaeb58eSwdenk cmi_mpc5xx_config hymod_config QS860T_config 21331eaeb58eSwdenk cogent_common_config IP860_config RPXlite_config 2134e63c8ee3Swdenk cogent_mpc8260_config IVML24_config RPXlite_DW_config 2135e63c8ee3Swdenk cogent_mpc8xx_config IVMS8_config RPXsuper_config 2136e63c8ee3Swdenk CPCI405_config JSE_config rsdproto_config 2137e63c8ee3Swdenk CPCIISER4_config LANTEC_config Sandpoint8240_config 2138e63c8ee3Swdenk csb272_config lwmon_config sbc8260_config 2139466b7410Swdenk CU824_config MBX860T_config sbc8560_33_config 2140466b7410Swdenk DUET_ADS_config MBX_config sbc8560_66_config 21418b07a110Swdenk EBONY_config MPC8260ADS_config SM850_config 21428b07a110Swdenk ELPT860_config MPC8540ADS_config SPD823TS_config 21438b07a110Swdenk ESTEEM192E_config MPC8560ADS_config stxgp3_config 21448b07a110Swdenk ETX094_config NETVIA_config SXNI855T_config 21458b07a110Swdenk FADS823_config omap1510inn_config TQM823L_config 21468b07a110Swdenk FADS850SAR_config omap1610h2_config TQM850L_config 21478b07a110Swdenk FADS860T_config omap1610inn_config TQM855L_config 21488b07a110Swdenk FPS850L_config omap5912osk_config TQM860L_config 21498b07a110Swdenk WALNUT405_config 21508b07a110Swdenk ZPC1900_config 215154387ac9Swdenk 2152c609719bSwdenkNote: for some board special configuration names may exist; check if 2153c609719bSwdenk additional information is available from the board vendor; for 21542729af9dSwdenk instance, the TQM823L systems are available without (standard) 21552729af9dSwdenk or with LCD support. You can select such additional "features" 2156c609719bSwdenk when chosing the configuration, i. e. 2157c609719bSwdenk 21582729af9dSwdenk make TQM823L_config 21592729af9dSwdenk - will configure for a plain TQM823L, i. e. no LCD support 2160c609719bSwdenk 2161c609719bSwdenk make TQM823L_LCD_config 2162c609719bSwdenk - will configure for a TQM823L with U-Boot console on LCD 2163c609719bSwdenk 2164c609719bSwdenk etc. 2165c609719bSwdenk 2166c609719bSwdenk 2167c609719bSwdenkFinally, type "make all", and you should get some working U-Boot 21687152b1d0Swdenkimages ready for download to / installation on your system: 2169c609719bSwdenk 2170c609719bSwdenk- "u-boot.bin" is a raw binary image 2171c609719bSwdenk- "u-boot" is an image in ELF binary format 2172c609719bSwdenk- "u-boot.srec" is in Motorola S-Record format 2173c609719bSwdenk 2174c609719bSwdenk 2175c609719bSwdenkPlease be aware that the Makefiles assume you are using GNU make, so 2176c609719bSwdenkfor instance on NetBSD you might need to use "gmake" instead of 2177c609719bSwdenknative "make". 2178c609719bSwdenk 2179c609719bSwdenk 2180c609719bSwdenkIf the system board that you have is not listed, then you will need 2181c609719bSwdenkto port U-Boot to your hardware platform. To do this, follow these 2182c609719bSwdenksteps: 2183c609719bSwdenk 2184c609719bSwdenk1. Add a new configuration option for your board to the toplevel 218585ec0bccSwdenk "Makefile" and to the "MAKEALL" script, using the existing 218685ec0bccSwdenk entries as examples. Note that here and at many other places 21877152b1d0Swdenk boards and other names are listed in alphabetical sort order. Please 218885ec0bccSwdenk keep this order. 2189c609719bSwdenk2. Create a new directory to hold your board specific code. Add any 219085ec0bccSwdenk files you need. In your board directory, you will need at least 219185ec0bccSwdenk the "Makefile", a "<board>.c", "flash.c" and "u-boot.lds". 219285ec0bccSwdenk3. Create a new configuration file "include/configs/<board>.h" for 219385ec0bccSwdenk your board 2194c609719bSwdenk3. If you're porting U-Boot to a new CPU, then also create a new 2195c609719bSwdenk directory to hold your CPU specific code. Add any files you need. 219685ec0bccSwdenk4. Run "make <board>_config" with your new name. 2197c609719bSwdenk5. Type "make", and you should get a working "u-boot.srec" file 2198c609719bSwdenk to be installed on your target system. 219985ec0bccSwdenk6. Debug and solve any problems that might arise. 2200c609719bSwdenk [Of course, this last step is much harder than it sounds.] 2201c609719bSwdenk 2202c609719bSwdenk 2203c609719bSwdenkTesting of U-Boot Modifications, Ports to New Hardware, etc.: 2204c609719bSwdenk============================================================== 2205c609719bSwdenk 2206c609719bSwdenkIf you have modified U-Boot sources (for instance added a new board 2207c609719bSwdenkor support for new devices, a new CPU, etc.) you are expected to 2208c609719bSwdenkprovide feedback to the other developers. The feedback normally takes 2209c609719bSwdenkthe form of a "patch", i. e. a context diff against a certain (latest 2210c609719bSwdenkofficial or latest in CVS) version of U-Boot sources. 2211c609719bSwdenk 2212c609719bSwdenkBut before you submit such a patch, please verify that your modifi- 2213c609719bSwdenkcation did not break existing code. At least make sure that *ALL* of 2214c609719bSwdenkthe supported boards compile WITHOUT ANY compiler warnings. To do so, 2215c609719bSwdenkjust run the "MAKEALL" script, which will configure and build U-Boot 2216c609719bSwdenkfor ALL supported system. Be warned, this will take a while. You can 22177152b1d0Swdenkselect which (cross) compiler to use by passing a `CROSS_COMPILE' 2218c609719bSwdenkenvironment variable to the script, i. e. to use the cross tools from 2219c609719bSwdenkMontaVista's Hard Hat Linux you can type 2220c609719bSwdenk 2221c609719bSwdenk CROSS_COMPILE=ppc_8xx- MAKEALL 2222c609719bSwdenk 2223c609719bSwdenkor to build on a native PowerPC system you can type 2224c609719bSwdenk 2225c609719bSwdenk CROSS_COMPILE=' ' MAKEALL 2226c609719bSwdenk 2227c609719bSwdenkSee also "U-Boot Porting Guide" below. 2228c609719bSwdenk 2229c609719bSwdenk 2230c609719bSwdenkMonitor Commands - Overview: 2231c609719bSwdenk============================ 2232c609719bSwdenk 2233c609719bSwdenkgo - start application at address 'addr' 2234c609719bSwdenkrun - run commands in an environment variable 2235c609719bSwdenkbootm - boot application image from memory 2236c609719bSwdenkbootp - boot image via network using BootP/TFTP protocol 2237c609719bSwdenktftpboot- boot image via network using TFTP protocol 2238c609719bSwdenk and env variables "ipaddr" and "serverip" 2239c609719bSwdenk (and eventually "gatewayip") 2240c609719bSwdenkrarpboot- boot image via network using RARP/TFTP protocol 2241c609719bSwdenkdiskboot- boot from IDE devicebootd - boot default, i.e., run 'bootcmd' 2242c609719bSwdenkloads - load S-Record file over serial line 2243c609719bSwdenkloadb - load binary file over serial line (kermit mode) 2244c609719bSwdenkmd - memory display 2245c609719bSwdenkmm - memory modify (auto-incrementing) 2246c609719bSwdenknm - memory modify (constant address) 2247c609719bSwdenkmw - memory write (fill) 2248c609719bSwdenkcp - memory copy 2249c609719bSwdenkcmp - memory compare 2250c609719bSwdenkcrc32 - checksum calculation 2251c609719bSwdenkimd - i2c memory display 2252c609719bSwdenkimm - i2c memory modify (auto-incrementing) 2253c609719bSwdenkinm - i2c memory modify (constant address) 2254c609719bSwdenkimw - i2c memory write (fill) 2255c609719bSwdenkicrc32 - i2c checksum calculation 2256c609719bSwdenkiprobe - probe to discover valid I2C chip addresses 2257c609719bSwdenkiloop - infinite loop on address range 2258c609719bSwdenkisdram - print SDRAM configuration information 2259c609719bSwdenksspi - SPI utility commands 2260c609719bSwdenkbase - print or set address offset 2261c609719bSwdenkprintenv- print environment variables 2262c609719bSwdenksetenv - set environment variables 2263c609719bSwdenksaveenv - save environment variables to persistent storage 2264c609719bSwdenkprotect - enable or disable FLASH write protection 2265c609719bSwdenkerase - erase FLASH memory 2266c609719bSwdenkflinfo - print FLASH memory information 2267c609719bSwdenkbdinfo - print Board Info structure 2268c609719bSwdenkiminfo - print header information for application image 2269c609719bSwdenkconinfo - print console devices and informations 2270c609719bSwdenkide - IDE sub-system 2271c609719bSwdenkloop - infinite loop on address range 227256523f12Swdenkloopw - infinite write loop on address range 2273c609719bSwdenkmtest - simple RAM test 2274c609719bSwdenkicache - enable or disable instruction cache 2275c609719bSwdenkdcache - enable or disable data cache 2276c609719bSwdenkreset - Perform RESET of the CPU 2277c609719bSwdenkecho - echo args to console 2278c609719bSwdenkversion - print monitor version 2279c609719bSwdenkhelp - print online help 2280c609719bSwdenk? - alias for 'help' 2281c609719bSwdenk 2282c609719bSwdenk 2283c609719bSwdenkMonitor Commands - Detailed Description: 2284c609719bSwdenk======================================== 2285c609719bSwdenk 2286c609719bSwdenkTODO. 2287c609719bSwdenk 2288c609719bSwdenkFor now: just type "help <command>". 2289c609719bSwdenk 2290c609719bSwdenk 2291c609719bSwdenkEnvironment Variables: 2292c609719bSwdenk====================== 2293c609719bSwdenk 2294c609719bSwdenkU-Boot supports user configuration using Environment Variables which 2295c609719bSwdenkcan be made persistent by saving to Flash memory. 2296c609719bSwdenk 2297c609719bSwdenkEnvironment Variables are set using "setenv", printed using 2298c609719bSwdenk"printenv", and saved to Flash using "saveenv". Using "setenv" 2299c609719bSwdenkwithout a value can be used to delete a variable from the 2300c609719bSwdenkenvironment. As long as you don't save the environment you are 2301c609719bSwdenkworking with an in-memory copy. In case the Flash area containing the 2302c609719bSwdenkenvironment is erased by accident, a default environment is provided. 2303c609719bSwdenk 2304c609719bSwdenkSome configuration options can be set using Environment Variables: 2305c609719bSwdenk 2306c609719bSwdenk baudrate - see CONFIG_BAUDRATE 2307c609719bSwdenk 2308c609719bSwdenk bootdelay - see CONFIG_BOOTDELAY 2309c609719bSwdenk 2310c609719bSwdenk bootcmd - see CONFIG_BOOTCOMMAND 2311c609719bSwdenk 2312c609719bSwdenk bootargs - Boot arguments when booting an RTOS image 2313c609719bSwdenk 2314c609719bSwdenk bootfile - Name of the image to load with TFTP 2315c609719bSwdenk 2316c609719bSwdenk autoload - if set to "no" (any string beginning with 'n'), 2317c609719bSwdenk "bootp" will just load perform a lookup of the 2318c609719bSwdenk configuration from the BOOTP server, but not try to 2319c609719bSwdenk load any image using TFTP 2320c609719bSwdenk 2321c609719bSwdenk autostart - if set to "yes", an image loaded using the "bootp", 2322c609719bSwdenk "rarpboot", "tftpboot" or "diskboot" commands will 2323c609719bSwdenk be automatically started (by internally calling 2324c609719bSwdenk "bootm") 2325c609719bSwdenk 23264a6fd34bSwdenk If set to "no", a standalone image passed to the 23274a6fd34bSwdenk "bootm" command will be copied to the load address 23284a6fd34bSwdenk (and eventually uncompressed), but NOT be started. 23294a6fd34bSwdenk This can be used to load and uncompress arbitrary 23304a6fd34bSwdenk data. 23314a6fd34bSwdenk 233217ea1177Swdenk i2cfast - (PPC405GP|PPC405EP only) 233317ea1177Swdenk if set to 'y' configures Linux I2C driver for fast 233417ea1177Swdenk mode (400kHZ). This environment variable is used in 233517ea1177Swdenk initialization code. So, for changes to be effective 233617ea1177Swdenk it must be saved and board must be reset. 233717ea1177Swdenk 2338c609719bSwdenk initrd_high - restrict positioning of initrd images: 2339c609719bSwdenk If this variable is not set, initrd images will be 2340c609719bSwdenk copied to the highest possible address in RAM; this 2341c609719bSwdenk is usually what you want since it allows for 2342c609719bSwdenk maximum initrd size. If for some reason you want to 2343c609719bSwdenk make sure that the initrd image is loaded below the 2344c609719bSwdenk CFG_BOOTMAPSZ limit, you can set this environment 2345c609719bSwdenk variable to a value of "no" or "off" or "0". 2346c609719bSwdenk Alternatively, you can set it to a maximum upper 2347c609719bSwdenk address to use (U-Boot will still check that it 2348c609719bSwdenk does not overwrite the U-Boot stack and data). 2349c609719bSwdenk 2350c609719bSwdenk For instance, when you have a system with 16 MB 23517152b1d0Swdenk RAM, and want to reserve 4 MB from use by Linux, 2352c609719bSwdenk you can do this by adding "mem=12M" to the value of 2353c609719bSwdenk the "bootargs" variable. However, now you must make 23547152b1d0Swdenk sure that the initrd image is placed in the first 2355c609719bSwdenk 12 MB as well - this can be done with 2356c609719bSwdenk 2357c609719bSwdenk setenv initrd_high 00c00000 2358c609719bSwdenk 235938b99261Swdenk If you set initrd_high to 0xFFFFFFFF, this is an 236038b99261Swdenk indication to U-Boot that all addresses are legal 236138b99261Swdenk for the Linux kernel, including addresses in flash 236238b99261Swdenk memory. In this case U-Boot will NOT COPY the 236338b99261Swdenk ramdisk at all. This may be useful to reduce the 236438b99261Swdenk boot time on your system, but requires that this 236538b99261Swdenk feature is supported by your Linux kernel. 236638b99261Swdenk 2367c609719bSwdenk ipaddr - IP address; needed for tftpboot command 2368c609719bSwdenk 2369c609719bSwdenk loadaddr - Default load address for commands like "bootp", 2370dc7c9a1aSwdenk "rarpboot", "tftpboot", "loadb" or "diskboot" 2371c609719bSwdenk 2372c609719bSwdenk loads_echo - see CONFIG_LOADS_ECHO 2373c609719bSwdenk 2374c609719bSwdenk serverip - TFTP server IP address; needed for tftpboot command 2375c609719bSwdenk 2376c609719bSwdenk bootretry - see CONFIG_BOOT_RETRY_TIME 2377c609719bSwdenk 2378c609719bSwdenk bootdelaykey - see CONFIG_AUTOBOOT_DELAY_STR 2379c609719bSwdenk 2380c609719bSwdenk bootstopkey - see CONFIG_AUTOBOOT_STOP_STR 2381c609719bSwdenk 2382a3d991bdSwdenk ethprime - When CONFIG_NET_MULTI is enabled controls which 2383a3d991bdSwdenk interface is used first. 2384a3d991bdSwdenk 2385a3d991bdSwdenk ethact - When CONFIG_NET_MULTI is enabled controls which 2386a3d991bdSwdenk interface is currently active. For example you 2387a3d991bdSwdenk can do the following 2388a3d991bdSwdenk 2389a3d991bdSwdenk => setenv ethact FEC ETHERNET 2390a3d991bdSwdenk => ping 192.168.0.1 # traffic sent on FEC ETHERNET 2391a3d991bdSwdenk => setenv ethact SCC ETHERNET 2392a3d991bdSwdenk => ping 10.0.0.1 # traffic sent on SCC ETHERNET 2393a3d991bdSwdenk 2394a3d991bdSwdenk netretry - When set to "no" each network operation will 2395a3d991bdSwdenk either succeed or fail without retrying. 23966e592385Swdenk When set to "once" the network operation will 23976e592385Swdenk fail when all the available network interfaces 23986e592385Swdenk are tried once without success. 2399a3d991bdSwdenk Useful on scripts which control the retry operation 2400a3d991bdSwdenk themselves. 2401a3d991bdSwdenk 2402a3d991bdSwdenk vlan - When set to a value < 4095 the traffic over 2403a3d991bdSwdenk ethernet is encapsulated/received over 802.1q 2404a3d991bdSwdenk VLAN tagged frames. 2405c609719bSwdenk 2406c609719bSwdenkThe following environment variables may be used and automatically 2407c609719bSwdenkupdated by the network boot commands ("bootp" and "rarpboot"), 2408c609719bSwdenkdepending the information provided by your boot server: 2409c609719bSwdenk 2410c609719bSwdenk bootfile - see above 2411c609719bSwdenk dnsip - IP address of your Domain Name Server 2412fe389a82Sstroese dnsip2 - IP address of your secondary Domain Name Server 2413c609719bSwdenk gatewayip - IP address of the Gateway (Router) to use 2414c609719bSwdenk hostname - Target hostname 2415c609719bSwdenk ipaddr - see above 2416c609719bSwdenk netmask - Subnet Mask 2417c609719bSwdenk rootpath - Pathname of the root filesystem on the NFS server 2418c609719bSwdenk serverip - see above 2419c609719bSwdenk 2420c609719bSwdenk 2421c609719bSwdenkThere are two special Environment Variables: 2422c609719bSwdenk 2423c609719bSwdenk serial# - contains hardware identification information such 2424c609719bSwdenk as type string and/or serial number 2425c609719bSwdenk ethaddr - Ethernet address 2426c609719bSwdenk 2427c609719bSwdenkThese variables can be set only once (usually during manufacturing of 2428c609719bSwdenkthe board). U-Boot refuses to delete or overwrite these variables 2429c609719bSwdenkonce they have been set once. 2430c609719bSwdenk 2431c609719bSwdenk 2432c1551ea8SstroeseFurther special Environment Variables: 2433c1551ea8Sstroese 2434c1551ea8Sstroese ver - Contains the U-Boot version string as printed 2435c1551ea8Sstroese with the "version" command. This variable is 2436c1551ea8Sstroese readonly (see CONFIG_VERSION_VARIABLE). 2437c1551ea8Sstroese 2438c1551ea8Sstroese 2439c609719bSwdenkPlease note that changes to some configuration parameters may take 2440c609719bSwdenkonly effect after the next boot (yes, that's just like Windoze :-). 2441c609719bSwdenk 2442c609719bSwdenk 2443f07771ccSwdenkCommand Line Parsing: 2444f07771ccSwdenk===================== 2445f07771ccSwdenk 2446f07771ccSwdenkThere are two different command line parsers available with U-Boot: 24477152b1d0Swdenkthe old "simple" one, and the much more powerful "hush" shell: 2448f07771ccSwdenk 2449f07771ccSwdenkOld, simple command line parser: 2450f07771ccSwdenk-------------------------------- 2451f07771ccSwdenk 2452f07771ccSwdenk- supports environment variables (through setenv / saveenv commands) 2453f07771ccSwdenk- several commands on one line, separated by ';' 2454f07771ccSwdenk- variable substitution using "... $(name) ..." syntax 2455f07771ccSwdenk- special characters ('$', ';') can be escaped by prefixing with '\', 2456f07771ccSwdenk for example: 2457f07771ccSwdenk setenv bootcmd bootm \$(address) 2458f07771ccSwdenk- You can also escape text by enclosing in single apostrophes, for example: 2459f07771ccSwdenk setenv addip 'setenv bootargs $bootargs ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname::off' 2460f07771ccSwdenk 2461f07771ccSwdenkHush shell: 2462f07771ccSwdenk----------- 2463f07771ccSwdenk 2464f07771ccSwdenk- similar to Bourne shell, with control structures like 2465f07771ccSwdenk if...then...else...fi, for...do...done; while...do...done, 2466f07771ccSwdenk until...do...done, ... 2467f07771ccSwdenk- supports environment ("global") variables (through setenv / saveenv 2468f07771ccSwdenk commands) and local shell variables (through standard shell syntax 2469f07771ccSwdenk "name=value"); only environment variables can be used with "run" 2470f07771ccSwdenk command 2471f07771ccSwdenk 2472f07771ccSwdenkGeneral rules: 2473f07771ccSwdenk-------------- 2474f07771ccSwdenk 2475f07771ccSwdenk(1) If a command line (or an environment variable executed by a "run" 2476f07771ccSwdenk command) contains several commands separated by semicolon, and 2477f07771ccSwdenk one of these commands fails, then the remaining commands will be 2478f07771ccSwdenk executed anyway. 2479f07771ccSwdenk 2480f07771ccSwdenk(2) If you execute several variables with one call to run (i. e. 2481f07771ccSwdenk calling run with a list af variables as arguments), any failing 2482f07771ccSwdenk command will cause "run" to terminate, i. e. the remaining 2483f07771ccSwdenk variables are not executed. 2484f07771ccSwdenk 2485c609719bSwdenkNote for Redundant Ethernet Interfaces: 2486c609719bSwdenk======================================= 2487c609719bSwdenk 24887152b1d0SwdenkSome boards come with redundant ethernet interfaces; U-Boot supports 2489c609719bSwdenksuch configurations and is capable of automatic selection of a 24907152b1d0Swdenk"working" interface when needed. MAC assignment works as follows: 2491c609719bSwdenk 2492c609719bSwdenkNetwork interfaces are numbered eth0, eth1, eth2, ... Corresponding 2493c609719bSwdenkMAC addresses can be stored in the environment as "ethaddr" (=>eth0), 2494c609719bSwdenk"eth1addr" (=>eth1), "eth2addr", ... 2495c609719bSwdenk 2496c609719bSwdenkIf the network interface stores some valid MAC address (for instance 2497c609719bSwdenkin SROM), this is used as default address if there is NO correspon- 2498c609719bSwdenkding setting in the environment; if the corresponding environment 2499c609719bSwdenkvariable is set, this overrides the settings in the card; that means: 2500c609719bSwdenk 2501c609719bSwdenko If the SROM has a valid MAC address, and there is no address in the 2502c609719bSwdenk environment, the SROM's address is used. 2503c609719bSwdenk 2504c609719bSwdenko If there is no valid address in the SROM, and a definition in the 2505c609719bSwdenk environment exists, then the value from the environment variable is 2506c609719bSwdenk used. 2507c609719bSwdenk 2508c609719bSwdenko If both the SROM and the environment contain a MAC address, and 2509c609719bSwdenk both addresses are the same, this MAC address is used. 2510c609719bSwdenk 2511c609719bSwdenko If both the SROM and the environment contain a MAC address, and the 2512c609719bSwdenk addresses differ, the value from the environment is used and a 2513c609719bSwdenk warning is printed. 2514c609719bSwdenk 2515c609719bSwdenko If neither SROM nor the environment contain a MAC address, an error 2516c609719bSwdenk is raised. 2517c609719bSwdenk 2518c609719bSwdenk 2519c609719bSwdenkImage Formats: 2520c609719bSwdenk============== 2521c609719bSwdenk 2522c609719bSwdenkThe "boot" commands of this monitor operate on "image" files which 2523c609719bSwdenkcan be basicly anything, preceeded by a special header; see the 2524c609719bSwdenkdefinitions in include/image.h for details; basicly, the header 2525c609719bSwdenkdefines the following image properties: 2526c609719bSwdenk 2527c609719bSwdenk* Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD, 2528c609719bSwdenk 4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks, 25297f70e853Swdenk LynxOS, pSOS, QNX, RTEMS, ARTOS; 25301f4bb37dSwdenk Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, ARTOS, LynxOS). 2531c609719bSwdenk* Target CPU Architecture (Provisions for Alpha, ARM, Intel x86, 25323d1e8a9dSwdenk IA64, MIPS, NIOS, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit; 25333d1e8a9dSwdenk Currently supported: ARM, Intel x86, MIPS, NIOS, PowerPC). 2534c29fdfc1Swdenk* Compression Type (uncompressed, gzip, bzip2) 2535c609719bSwdenk* Load Address 2536c609719bSwdenk* Entry Point 2537c609719bSwdenk* Image Name 2538c609719bSwdenk* Image Timestamp 2539c609719bSwdenk 2540c609719bSwdenkThe header is marked by a special Magic Number, and both the header 2541c609719bSwdenkand the data portions of the image are secured against corruption by 2542c609719bSwdenkCRC32 checksums. 2543c609719bSwdenk 2544c609719bSwdenk 2545c609719bSwdenkLinux Support: 2546c609719bSwdenk============== 2547c609719bSwdenk 2548c609719bSwdenkAlthough U-Boot should support any OS or standalone application 25497152b1d0Swdenkeasily, the main focus has always been on Linux during the design of 2550c609719bSwdenkU-Boot. 2551c609719bSwdenk 2552c609719bSwdenkU-Boot includes many features that so far have been part of some 2553c609719bSwdenkspecial "boot loader" code within the Linux kernel. Also, any 2554c609719bSwdenk"initrd" images to be used are no longer part of one big Linux image; 2555c609719bSwdenkinstead, kernel and "initrd" are separate images. This implementation 25567152b1d0Swdenkserves several purposes: 2557c609719bSwdenk 2558c609719bSwdenk- the same features can be used for other OS or standalone 2559c609719bSwdenk applications (for instance: using compressed images to reduce the 2560c609719bSwdenk Flash memory footprint) 2561c609719bSwdenk 2562c609719bSwdenk- it becomes much easier to port new Linux kernel versions because 25637152b1d0Swdenk lots of low-level, hardware dependent stuff are done by U-Boot 2564c609719bSwdenk 2565c609719bSwdenk- the same Linux kernel image can now be used with different "initrd" 2566c609719bSwdenk images; of course this also means that different kernel images can 2567c609719bSwdenk be run with the same "initrd". This makes testing easier (you don't 2568c609719bSwdenk have to build a new "zImage.initrd" Linux image when you just 2569c609719bSwdenk change a file in your "initrd"). Also, a field-upgrade of the 2570c609719bSwdenk software is easier now. 2571c609719bSwdenk 2572c609719bSwdenk 2573c609719bSwdenkLinux HOWTO: 2574c609719bSwdenk============ 2575c609719bSwdenk 2576c609719bSwdenkPorting Linux to U-Boot based systems: 2577c609719bSwdenk--------------------------------------- 2578c609719bSwdenk 2579c609719bSwdenkU-Boot cannot save you from doing all the necessary modifications to 2580c609719bSwdenkconfigure the Linux device drivers for use with your target hardware 2581c609719bSwdenk(no, we don't intend to provide a full virtual machine interface to 2582c609719bSwdenkLinux :-). 2583c609719bSwdenk 2584c609719bSwdenkBut now you can ignore ALL boot loader code (in arch/ppc/mbxboot). 2585c609719bSwdenk 2586c609719bSwdenkJust make sure your machine specific header file (for instance 2587c609719bSwdenkinclude/asm-ppc/tqm8xx.h) includes the same definition of the Board 2588c609719bSwdenkInformation structure as we define in include/u-boot.h, and make 2589c609719bSwdenksure that your definition of IMAP_ADDR uses the same value as your 2590c609719bSwdenkU-Boot configuration in CFG_IMMR. 2591c609719bSwdenk 2592c609719bSwdenk 2593c609719bSwdenkConfiguring the Linux kernel: 2594c609719bSwdenk----------------------------- 2595c609719bSwdenk 2596c609719bSwdenkNo specific requirements for U-Boot. Make sure you have some root 2597c609719bSwdenkdevice (initial ramdisk, NFS) for your target system. 2598c609719bSwdenk 2599c609719bSwdenk 2600c609719bSwdenkBuilding a Linux Image: 2601c609719bSwdenk----------------------- 2602c609719bSwdenk 260324ee89b9SwdenkWith U-Boot, "normal" build targets like "zImage" or "bzImage" are 260424ee89b9Swdenknot used. If you use recent kernel source, a new build target 260524ee89b9Swdenk"uImage" will exist which automatically builds an image usable by 260624ee89b9SwdenkU-Boot. Most older kernels also have support for a "pImage" target, 260724ee89b9Swdenkwhich was introduced for our predecessor project PPCBoot and uses a 260824ee89b9Swdenk100% compatible format. 2609c609719bSwdenk 2610c609719bSwdenkExample: 2611c609719bSwdenk 2612c609719bSwdenk make TQM850L_config 2613c609719bSwdenk make oldconfig 2614c609719bSwdenk make dep 261524ee89b9Swdenk make uImage 2616c609719bSwdenk 261724ee89b9SwdenkThe "uImage" build target uses a special tool (in 'tools/mkimage') to 261824ee89b9Swdenkencapsulate a compressed Linux kernel image with header information, 261924ee89b9SwdenkCRC32 checksum etc. for use with U-Boot. This is what we are doing: 2620c609719bSwdenk 262124ee89b9Swdenk* build a standard "vmlinux" kernel image (in ELF binary format): 262224ee89b9Swdenk 262324ee89b9Swdenk* convert the kernel into a raw binary image: 262424ee89b9Swdenk 262524ee89b9Swdenk ${CROSS_COMPILE}-objcopy -O binary \ 262624ee89b9Swdenk -R .note -R .comment \ 262724ee89b9Swdenk -S vmlinux linux.bin 262824ee89b9Swdenk 262924ee89b9Swdenk* compress the binary image: 263024ee89b9Swdenk 263124ee89b9Swdenk gzip -9 linux.bin 263224ee89b9Swdenk 263324ee89b9Swdenk* package compressed binary image for U-Boot: 263424ee89b9Swdenk 263524ee89b9Swdenk mkimage -A ppc -O linux -T kernel -C gzip \ 263624ee89b9Swdenk -a 0 -e 0 -n "Linux Kernel Image" \ 263724ee89b9Swdenk -d linux.bin.gz uImage 263824ee89b9Swdenk 263924ee89b9Swdenk 264024ee89b9SwdenkThe "mkimage" tool can also be used to create ramdisk images for use 264124ee89b9Swdenkwith U-Boot, either separated from the Linux kernel image, or 264224ee89b9Swdenkcombined into one file. "mkimage" encapsulates the images with a 64 264324ee89b9Swdenkbyte header containing information about target architecture, 264424ee89b9Swdenkoperating system, image type, compression method, entry points, time 264524ee89b9Swdenkstamp, CRC32 checksums, etc. 264624ee89b9Swdenk 264724ee89b9Swdenk"mkimage" can be called in two ways: to verify existing images and 264824ee89b9Swdenkprint the header information, or to build new images. 2649c609719bSwdenk 2650c609719bSwdenkIn the first form (with "-l" option) mkimage lists the information 2651c609719bSwdenkcontained in the header of an existing U-Boot image; this includes 2652c609719bSwdenkchecksum verification: 2653c609719bSwdenk 2654c609719bSwdenk tools/mkimage -l image 2655c609719bSwdenk -l ==> list image header information 2656c609719bSwdenk 2657c609719bSwdenkThe second form (with "-d" option) is used to build a U-Boot image 2658c609719bSwdenkfrom a "data file" which is used as image payload: 2659c609719bSwdenk 2660c609719bSwdenk tools/mkimage -A arch -O os -T type -C comp -a addr -e ep \ 2661c609719bSwdenk -n name -d data_file image 2662c609719bSwdenk -A ==> set architecture to 'arch' 2663c609719bSwdenk -O ==> set operating system to 'os' 2664c609719bSwdenk -T ==> set image type to 'type' 2665c609719bSwdenk -C ==> set compression type 'comp' 2666c609719bSwdenk -a ==> set load address to 'addr' (hex) 2667c609719bSwdenk -e ==> set entry point to 'ep' (hex) 2668c609719bSwdenk -n ==> set image name to 'name' 2669c609719bSwdenk -d ==> use image data from 'datafile' 2670c609719bSwdenk 267169459791SwdenkRight now, all Linux kernels for PowerPC systems use the same load 267269459791Swdenkaddress (0x00000000), but the entry point address depends on the 267369459791Swdenkkernel version: 2674c609719bSwdenk 2675c609719bSwdenk- 2.2.x kernels have the entry point at 0x0000000C, 267624ee89b9Swdenk- 2.3.x and later kernels have the entry point at 0x00000000. 2677c609719bSwdenk 2678c609719bSwdenkSo a typical call to build a U-Boot image would read: 2679c609719bSwdenk 268024ee89b9Swdenk -> tools/mkimage -n '2.4.4 kernel for TQM850L' \ 268124ee89b9Swdenk > -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \ 268224ee89b9Swdenk > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/ppc/coffboot/vmlinux.gz \ 268324ee89b9Swdenk > examples/uImage.TQM850L 268424ee89b9Swdenk Image Name: 2.4.4 kernel for TQM850L 2685c609719bSwdenk Created: Wed Jul 19 02:34:59 2000 2686c609719bSwdenk Image Type: PowerPC Linux Kernel Image (gzip compressed) 2687c609719bSwdenk Data Size: 335725 Bytes = 327.86 kB = 0.32 MB 2688c609719bSwdenk Load Address: 0x00000000 268924ee89b9Swdenk Entry Point: 0x00000000 2690c609719bSwdenk 2691c609719bSwdenkTo verify the contents of the image (or check for corruption): 2692c609719bSwdenk 269324ee89b9Swdenk -> tools/mkimage -l examples/uImage.TQM850L 269424ee89b9Swdenk Image Name: 2.4.4 kernel for TQM850L 2695c609719bSwdenk Created: Wed Jul 19 02:34:59 2000 2696c609719bSwdenk Image Type: PowerPC Linux Kernel Image (gzip compressed) 2697c609719bSwdenk Data Size: 335725 Bytes = 327.86 kB = 0.32 MB 2698c609719bSwdenk Load Address: 0x00000000 269924ee89b9Swdenk Entry Point: 0x00000000 2700c609719bSwdenk 2701c609719bSwdenkNOTE: for embedded systems where boot time is critical you can trade 2702c609719bSwdenkspeed for memory and install an UNCOMPRESSED image instead: this 2703c609719bSwdenkneeds more space in Flash, but boots much faster since it does not 2704c609719bSwdenkneed to be uncompressed: 2705c609719bSwdenk 270624ee89b9Swdenk -> gunzip /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/ppc/coffboot/vmlinux.gz 270724ee89b9Swdenk -> tools/mkimage -n '2.4.4 kernel for TQM850L' \ 270824ee89b9Swdenk > -A ppc -O linux -T kernel -C none -a 0 -e 0 \ 270924ee89b9Swdenk > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/ppc/coffboot/vmlinux \ 271024ee89b9Swdenk > examples/uImage.TQM850L-uncompressed 271124ee89b9Swdenk Image Name: 2.4.4 kernel for TQM850L 2712c609719bSwdenk Created: Wed Jul 19 02:34:59 2000 2713c609719bSwdenk Image Type: PowerPC Linux Kernel Image (uncompressed) 2714c609719bSwdenk Data Size: 792160 Bytes = 773.59 kB = 0.76 MB 2715c609719bSwdenk Load Address: 0x00000000 271624ee89b9Swdenk Entry Point: 0x00000000 2717c609719bSwdenk 2718c609719bSwdenk 2719c609719bSwdenkSimilar you can build U-Boot images from a 'ramdisk.image.gz' file 2720c609719bSwdenkwhen your kernel is intended to use an initial ramdisk: 2721c609719bSwdenk 2722c609719bSwdenk -> tools/mkimage -n 'Simple Ramdisk Image' \ 2723c609719bSwdenk > -A ppc -O linux -T ramdisk -C gzip \ 2724c609719bSwdenk > -d /LinuxPPC/images/SIMPLE-ramdisk.image.gz examples/simple-initrd 2725c609719bSwdenk Image Name: Simple Ramdisk Image 2726c609719bSwdenk Created: Wed Jan 12 14:01:50 2000 2727c609719bSwdenk Image Type: PowerPC Linux RAMDisk Image (gzip compressed) 2728c609719bSwdenk Data Size: 566530 Bytes = 553.25 kB = 0.54 MB 2729c609719bSwdenk Load Address: 0x00000000 2730c609719bSwdenk Entry Point: 0x00000000 2731c609719bSwdenk 2732c609719bSwdenk 2733c609719bSwdenkInstalling a Linux Image: 2734c609719bSwdenk------------------------- 2735c609719bSwdenk 2736c609719bSwdenkTo downloading a U-Boot image over the serial (console) interface, 2737c609719bSwdenkyou must convert the image to S-Record format: 2738c609719bSwdenk 2739c609719bSwdenk objcopy -I binary -O srec examples/image examples/image.srec 2740c609719bSwdenk 2741c609719bSwdenkThe 'objcopy' does not understand the information in the U-Boot 2742c609719bSwdenkimage header, so the resulting S-Record file will be relative to 2743c609719bSwdenkaddress 0x00000000. To load it to a given address, you need to 2744c609719bSwdenkspecify the target address as 'offset' parameter with the 'loads' 2745c609719bSwdenkcommand. 2746c609719bSwdenk 2747c609719bSwdenkExample: install the image to address 0x40100000 (which on the 2748c609719bSwdenkTQM8xxL is in the first Flash bank): 2749c609719bSwdenk 2750c609719bSwdenk => erase 40100000 401FFFFF 2751c609719bSwdenk 2752c609719bSwdenk .......... done 2753c609719bSwdenk Erased 8 sectors 2754c609719bSwdenk 2755c609719bSwdenk => loads 40100000 2756c609719bSwdenk ## Ready for S-Record download ... 2757c609719bSwdenk ~>examples/image.srec 2758c609719bSwdenk 1 2 3 4 5 6 7 8 9 10 11 12 13 ... 2759c609719bSwdenk ... 2760c609719bSwdenk 15989 15990 15991 15992 2761c609719bSwdenk [file transfer complete] 2762c609719bSwdenk [connected] 2763c609719bSwdenk ## Start Addr = 0x00000000 2764c609719bSwdenk 2765c609719bSwdenk 2766c609719bSwdenkYou can check the success of the download using the 'iminfo' command; 2767c609719bSwdenkthis includes a checksum verification so you can be sure no data 2768c609719bSwdenkcorruption happened: 2769c609719bSwdenk 2770c609719bSwdenk => imi 40100000 2771c609719bSwdenk 2772c609719bSwdenk ## Checking Image at 40100000 ... 2773c609719bSwdenk Image Name: 2.2.13 for initrd on TQM850L 2774c609719bSwdenk Image Type: PowerPC Linux Kernel Image (gzip compressed) 2775c609719bSwdenk Data Size: 335725 Bytes = 327 kB = 0 MB 2776c609719bSwdenk Load Address: 00000000 2777c609719bSwdenk Entry Point: 0000000c 2778c609719bSwdenk Verifying Checksum ... OK 2779c609719bSwdenk 2780c609719bSwdenk 2781c609719bSwdenkBoot Linux: 2782c609719bSwdenk----------- 2783c609719bSwdenk 2784c609719bSwdenkThe "bootm" command is used to boot an application that is stored in 2785c609719bSwdenkmemory (RAM or Flash). In case of a Linux kernel image, the contents 2786c609719bSwdenkof the "bootargs" environment variable is passed to the kernel as 2787c609719bSwdenkparameters. You can check and modify this variable using the 2788c609719bSwdenk"printenv" and "setenv" commands: 2789c609719bSwdenk 2790c609719bSwdenk 2791c609719bSwdenk => printenv bootargs 2792c609719bSwdenk bootargs=root=/dev/ram 2793c609719bSwdenk 2794c609719bSwdenk => setenv bootargs root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2 2795c609719bSwdenk 2796c609719bSwdenk => printenv bootargs 2797c609719bSwdenk bootargs=root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2 2798c609719bSwdenk 2799c609719bSwdenk => bootm 40020000 2800c609719bSwdenk ## Booting Linux kernel at 40020000 ... 2801c609719bSwdenk Image Name: 2.2.13 for NFS on TQM850L 2802c609719bSwdenk Image Type: PowerPC Linux Kernel Image (gzip compressed) 2803c609719bSwdenk Data Size: 381681 Bytes = 372 kB = 0 MB 2804c609719bSwdenk Load Address: 00000000 2805c609719bSwdenk Entry Point: 0000000c 2806c609719bSwdenk Verifying Checksum ... OK 2807c609719bSwdenk Uncompressing Kernel Image ... OK 2808c609719bSwdenk Linux version 2.2.13 (wd@denx.local.net) (gcc version 2.95.2 19991024 (release)) #1 Wed Jul 19 02:35:17 MEST 2000 2809c609719bSwdenk Boot arguments: root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2 2810c609719bSwdenk time_init: decrementer frequency = 187500000/60 2811c609719bSwdenk Calibrating delay loop... 49.77 BogoMIPS 2812c609719bSwdenk Memory: 15208k available (700k kernel code, 444k data, 32k init) [c0000000,c1000000] 2813c609719bSwdenk ... 2814c609719bSwdenk 2815c609719bSwdenkIf you want to boot a Linux kernel with initial ram disk, you pass 28167152b1d0Swdenkthe memory addresses of both the kernel and the initrd image (PPBCOOT 2817c609719bSwdenkformat!) to the "bootm" command: 2818c609719bSwdenk 2819c609719bSwdenk => imi 40100000 40200000 2820c609719bSwdenk 2821c609719bSwdenk ## Checking Image at 40100000 ... 2822c609719bSwdenk Image Name: 2.2.13 for initrd on TQM850L 2823c609719bSwdenk Image Type: PowerPC Linux Kernel Image (gzip compressed) 2824c609719bSwdenk Data Size: 335725 Bytes = 327 kB = 0 MB 2825c609719bSwdenk Load Address: 00000000 2826c609719bSwdenk Entry Point: 0000000c 2827c609719bSwdenk Verifying Checksum ... OK 2828c609719bSwdenk 2829c609719bSwdenk ## Checking Image at 40200000 ... 2830c609719bSwdenk Image Name: Simple Ramdisk Image 2831c609719bSwdenk Image Type: PowerPC Linux RAMDisk Image (gzip compressed) 2832c609719bSwdenk Data Size: 566530 Bytes = 553 kB = 0 MB 2833c609719bSwdenk Load Address: 00000000 2834c609719bSwdenk Entry Point: 00000000 2835c609719bSwdenk Verifying Checksum ... OK 2836c609719bSwdenk 2837c609719bSwdenk => bootm 40100000 40200000 2838c609719bSwdenk ## Booting Linux kernel at 40100000 ... 2839c609719bSwdenk Image Name: 2.2.13 for initrd on TQM850L 2840c609719bSwdenk Image Type: PowerPC Linux Kernel Image (gzip compressed) 2841c609719bSwdenk Data Size: 335725 Bytes = 327 kB = 0 MB 2842c609719bSwdenk Load Address: 00000000 2843c609719bSwdenk Entry Point: 0000000c 2844c609719bSwdenk Verifying Checksum ... OK 2845c609719bSwdenk Uncompressing Kernel Image ... OK 2846c609719bSwdenk ## Loading RAMDisk Image at 40200000 ... 2847c609719bSwdenk Image Name: Simple Ramdisk Image 2848c609719bSwdenk Image Type: PowerPC Linux RAMDisk Image (gzip compressed) 2849c609719bSwdenk Data Size: 566530 Bytes = 553 kB = 0 MB 2850c609719bSwdenk Load Address: 00000000 2851c609719bSwdenk Entry Point: 00000000 2852c609719bSwdenk Verifying Checksum ... OK 2853c609719bSwdenk Loading Ramdisk ... OK 2854c609719bSwdenk Linux version 2.2.13 (wd@denx.local.net) (gcc version 2.95.2 19991024 (release)) #1 Wed Jul 19 02:32:08 MEST 2000 2855c609719bSwdenk Boot arguments: root=/dev/ram 2856c609719bSwdenk time_init: decrementer frequency = 187500000/60 2857c609719bSwdenk Calibrating delay loop... 49.77 BogoMIPS 2858c609719bSwdenk ... 2859c609719bSwdenk RAMDISK: Compressed image found at block 0 2860c609719bSwdenk VFS: Mounted root (ext2 filesystem). 2861c609719bSwdenk 2862c609719bSwdenk bash# 2863c609719bSwdenk 28646069ff26SwdenkMore About U-Boot Image Types: 28656069ff26Swdenk------------------------------ 28666069ff26Swdenk 28676069ff26SwdenkU-Boot supports the following image types: 28686069ff26Swdenk 28696069ff26Swdenk "Standalone Programs" are directly runnable in the environment 28706069ff26Swdenk provided by U-Boot; it is expected that (if they behave 28716069ff26Swdenk well) you can continue to work in U-Boot after return from 28726069ff26Swdenk the Standalone Program. 28736069ff26Swdenk "OS Kernel Images" are usually images of some Embedded OS which 28746069ff26Swdenk will take over control completely. Usually these programs 28756069ff26Swdenk will install their own set of exception handlers, device 28766069ff26Swdenk drivers, set up the MMU, etc. - this means, that you cannot 28776069ff26Swdenk expect to re-enter U-Boot except by resetting the CPU. 28786069ff26Swdenk "RAMDisk Images" are more or less just data blocks, and their 28796069ff26Swdenk parameters (address, size) are passed to an OS kernel that is 28806069ff26Swdenk being started. 28816069ff26Swdenk "Multi-File Images" contain several images, typically an OS 28826069ff26Swdenk (Linux) kernel image and one or more data images like 28836069ff26Swdenk RAMDisks. This construct is useful for instance when you want 28846069ff26Swdenk to boot over the network using BOOTP etc., where the boot 28856069ff26Swdenk server provides just a single image file, but you want to get 28866069ff26Swdenk for instance an OS kernel and a RAMDisk image. 28876069ff26Swdenk 28886069ff26Swdenk "Multi-File Images" start with a list of image sizes, each 28896069ff26Swdenk image size (in bytes) specified by an "uint32_t" in network 28906069ff26Swdenk byte order. This list is terminated by an "(uint32_t)0". 28916069ff26Swdenk Immediately after the terminating 0 follow the images, one by 28926069ff26Swdenk one, all aligned on "uint32_t" boundaries (size rounded up to 28936069ff26Swdenk a multiple of 4 bytes). 28946069ff26Swdenk 28956069ff26Swdenk "Firmware Images" are binary images containing firmware (like 28966069ff26Swdenk U-Boot or FPGA images) which usually will be programmed to 28976069ff26Swdenk flash memory. 28986069ff26Swdenk 28996069ff26Swdenk "Script files" are command sequences that will be executed by 29006069ff26Swdenk U-Boot's command interpreter; this feature is especially 29016069ff26Swdenk useful when you configure U-Boot to use a real shell (hush) 29026069ff26Swdenk as command interpreter. 29036069ff26Swdenk 2904c609719bSwdenk 2905c609719bSwdenkStandalone HOWTO: 2906c609719bSwdenk================= 2907c609719bSwdenk 2908c609719bSwdenkOne of the features of U-Boot is that you can dynamically load and 2909c609719bSwdenkrun "standalone" applications, which can use some resources of 2910c609719bSwdenkU-Boot like console I/O functions or interrupt services. 2911c609719bSwdenk 2912c609719bSwdenkTwo simple examples are included with the sources: 2913c609719bSwdenk 2914c609719bSwdenk"Hello World" Demo: 2915c609719bSwdenk------------------- 2916c609719bSwdenk 2917c609719bSwdenk'examples/hello_world.c' contains a small "Hello World" Demo 2918c609719bSwdenkapplication; it is automatically compiled when you build U-Boot. 2919c609719bSwdenkIt's configured to run at address 0x00040004, so you can play with it 2920c609719bSwdenklike that: 2921c609719bSwdenk 2922c609719bSwdenk => loads 2923c609719bSwdenk ## Ready for S-Record download ... 2924c609719bSwdenk ~>examples/hello_world.srec 2925c609719bSwdenk 1 2 3 4 5 6 7 8 9 10 11 ... 2926c609719bSwdenk [file transfer complete] 2927c609719bSwdenk [connected] 2928c609719bSwdenk ## Start Addr = 0x00040004 2929c609719bSwdenk 2930c609719bSwdenk => go 40004 Hello World! This is a test. 2931c609719bSwdenk ## Starting application at 0x00040004 ... 2932c609719bSwdenk Hello World 2933c609719bSwdenk argc = 7 2934c609719bSwdenk argv[0] = "40004" 2935c609719bSwdenk argv[1] = "Hello" 2936c609719bSwdenk argv[2] = "World!" 2937c609719bSwdenk argv[3] = "This" 2938c609719bSwdenk argv[4] = "is" 2939c609719bSwdenk argv[5] = "a" 2940c609719bSwdenk argv[6] = "test." 2941c609719bSwdenk argv[7] = "<NULL>" 2942c609719bSwdenk Hit any key to exit ... 2943c609719bSwdenk 2944c609719bSwdenk ## Application terminated, rc = 0x0 2945c609719bSwdenk 2946c609719bSwdenkAnother example, which demonstrates how to register a CPM interrupt 2947c609719bSwdenkhandler with the U-Boot code, can be found in 'examples/timer.c'. 2948c609719bSwdenkHere, a CPM timer is set up to generate an interrupt every second. 2949c609719bSwdenkThe interrupt service routine is trivial, just printing a '.' 2950c609719bSwdenkcharacter, but this is just a demo program. The application can be 2951c609719bSwdenkcontrolled by the following keys: 2952c609719bSwdenk 2953c609719bSwdenk ? - print current values og the CPM Timer registers 2954c609719bSwdenk b - enable interrupts and start timer 2955c609719bSwdenk e - stop timer and disable interrupts 2956c609719bSwdenk q - quit application 2957c609719bSwdenk 2958c609719bSwdenk => loads 2959c609719bSwdenk ## Ready for S-Record download ... 2960c609719bSwdenk ~>examples/timer.srec 2961c609719bSwdenk 1 2 3 4 5 6 7 8 9 10 11 ... 2962c609719bSwdenk [file transfer complete] 2963c609719bSwdenk [connected] 2964c609719bSwdenk ## Start Addr = 0x00040004 2965c609719bSwdenk 2966c609719bSwdenk => go 40004 2967c609719bSwdenk ## Starting application at 0x00040004 ... 2968c609719bSwdenk TIMERS=0xfff00980 2969c609719bSwdenk Using timer 1 2970c609719bSwdenk tgcr @ 0xfff00980, tmr @ 0xfff00990, trr @ 0xfff00994, tcr @ 0xfff00998, tcn @ 0xfff0099c, ter @ 0xfff009b0 2971c609719bSwdenk 2972c609719bSwdenkHit 'b': 2973c609719bSwdenk [q, b, e, ?] Set interval 1000000 us 2974c609719bSwdenk Enabling timer 2975c609719bSwdenkHit '?': 2976c609719bSwdenk [q, b, e, ?] ........ 2977c609719bSwdenk tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0xef6, ter=0x0 2978c609719bSwdenkHit '?': 2979c609719bSwdenk [q, b, e, ?] . 2980c609719bSwdenk tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x2ad4, ter=0x0 2981c609719bSwdenkHit '?': 2982c609719bSwdenk [q, b, e, ?] . 2983c609719bSwdenk tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x1efc, ter=0x0 2984c609719bSwdenkHit '?': 2985c609719bSwdenk [q, b, e, ?] . 2986c609719bSwdenk tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x169d, ter=0x0 2987c609719bSwdenkHit 'e': 2988c609719bSwdenk [q, b, e, ?] ...Stopping timer 2989c609719bSwdenkHit 'q': 2990c609719bSwdenk [q, b, e, ?] ## Application terminated, rc = 0x0 2991c609719bSwdenk 2992c609719bSwdenk 299385ec0bccSwdenkMinicom warning: 299485ec0bccSwdenk================ 299585ec0bccSwdenk 29967152b1d0SwdenkOver time, many people have reported problems when trying to use the 299785ec0bccSwdenk"minicom" terminal emulation program for serial download. I (wd) 299885ec0bccSwdenkconsider minicom to be broken, and recommend not to use it. Under 2999f07771ccSwdenkUnix, I recommend to use C-Kermit for general purpose use (and 300085ec0bccSwdenkespecially for kermit binary protocol download ("loadb" command), and 300185ec0bccSwdenkuse "cu" for S-Record download ("loads" command). 300285ec0bccSwdenk 300352f52c14SwdenkNevertheless, if you absolutely want to use it try adding this 300452f52c14Swdenkconfiguration to your "File transfer protocols" section: 300552f52c14Swdenk 300652f52c14Swdenk Name Program Name U/D FullScr IO-Red. Multi 300752f52c14Swdenk X kermit /usr/bin/kermit -i -l %l -s Y U Y N N 300852f52c14Swdenk Y kermit /usr/bin/kermit -i -l %l -r N D Y N N 300952f52c14Swdenk 301052f52c14Swdenk 3011c609719bSwdenkNetBSD Notes: 3012c609719bSwdenk============= 3013c609719bSwdenk 3014c609719bSwdenkStarting at version 0.9.2, U-Boot supports NetBSD both as host 3015c609719bSwdenk(build U-Boot) and target system (boots NetBSD/mpc8xx). 3016c609719bSwdenk 3017c609719bSwdenkBuilding requires a cross environment; it is known to work on 3018c609719bSwdenkNetBSD/i386 with the cross-powerpc-netbsd-1.3 package (you will also 3019c609719bSwdenkneed gmake since the Makefiles are not compatible with BSD make). 3020c609719bSwdenkNote that the cross-powerpc package does not install include files; 3021c609719bSwdenkattempting to build U-Boot will fail because <machine/ansi.h> is 3022c609719bSwdenkmissing. This file has to be installed and patched manually: 3023c609719bSwdenk 3024c609719bSwdenk # cd /usr/pkg/cross/powerpc-netbsd/include 3025c609719bSwdenk # mkdir powerpc 3026c609719bSwdenk # ln -s powerpc machine 3027c609719bSwdenk # cp /usr/src/sys/arch/powerpc/include/ansi.h powerpc/ansi.h 3028c609719bSwdenk # ${EDIT} powerpc/ansi.h ## must remove __va_list, _BSD_VA_LIST 3029c609719bSwdenk 3030c609719bSwdenkNative builds *don't* work due to incompatibilities between native 3031c609719bSwdenkand U-Boot include files. 3032c609719bSwdenk 3033c609719bSwdenkBooting assumes that (the first part of) the image booted is a 3034c609719bSwdenkstage-2 loader which in turn loads and then invokes the kernel 3035c609719bSwdenkproper. Loader sources will eventually appear in the NetBSD source 3036c609719bSwdenktree (probably in sys/arc/mpc8xx/stand/u-boot_stage2/); in the 3037c609719bSwdenkmeantime, send mail to bruno@exet-ag.de and/or wd@denx.de for 3038c609719bSwdenkdetails. 3039c609719bSwdenk 3040c609719bSwdenk 3041c609719bSwdenkImplementation Internals: 3042c609719bSwdenk========================= 3043c609719bSwdenk 3044c609719bSwdenkThe following is not intended to be a complete description of every 3045c609719bSwdenkimplementation detail. However, it should help to understand the 3046c609719bSwdenkinner workings of U-Boot and make it easier to port it to custom 3047c609719bSwdenkhardware. 3048c609719bSwdenk 3049c609719bSwdenk 3050c609719bSwdenkInitial Stack, Global Data: 3051c609719bSwdenk--------------------------- 3052c609719bSwdenk 3053c609719bSwdenkThe implementation of U-Boot is complicated by the fact that U-Boot 3054c609719bSwdenkstarts running out of ROM (flash memory), usually without access to 3055c609719bSwdenksystem RAM (because the memory controller is not initialized yet). 3056c609719bSwdenkThis means that we don't have writable Data or BSS segments, and BSS 3057c609719bSwdenkis not initialized as zero. To be able to get a C environment working 3058c609719bSwdenkat all, we have to allocate at least a minimal stack. Implementation 3059c609719bSwdenkoptions for this are defined and restricted by the CPU used: Some CPU 3060c609719bSwdenkmodels provide on-chip memory (like the IMMR area on MPC8xx and 3061c609719bSwdenkMPC826x processors), on others (parts of) the data cache can be 3062c609719bSwdenklocked as (mis-) used as memory, etc. 3063c609719bSwdenk 30647152b1d0Swdenk Chris Hallinan posted a good summary of these issues to the 306543d9616cSwdenk u-boot-users mailing list: 306643d9616cSwdenk 306743d9616cSwdenk Subject: RE: [U-Boot-Users] RE: More On Memory Bank x (nothingness)? 306843d9616cSwdenk From: "Chris Hallinan" <clh@net1plus.com> 306943d9616cSwdenk Date: Mon, 10 Feb 2003 16:43:46 -0500 (22:43 MET) 307043d9616cSwdenk ... 307143d9616cSwdenk 307243d9616cSwdenk Correct me if I'm wrong, folks, but the way I understand it 307343d9616cSwdenk is this: Using DCACHE as initial RAM for Stack, etc, does not 307443d9616cSwdenk require any physical RAM backing up the cache. The cleverness 307543d9616cSwdenk is that the cache is being used as a temporary supply of 307643d9616cSwdenk necessary storage before the SDRAM controller is setup. It's 307743d9616cSwdenk beyond the scope of this list to expain the details, but you 307843d9616cSwdenk can see how this works by studying the cache architecture and 307943d9616cSwdenk operation in the architecture and processor-specific manuals. 308043d9616cSwdenk 308143d9616cSwdenk OCM is On Chip Memory, which I believe the 405GP has 4K. It 308243d9616cSwdenk is another option for the system designer to use as an 308343d9616cSwdenk initial stack/ram area prior to SDRAM being available. Either 308443d9616cSwdenk option should work for you. Using CS 4 should be fine if your 308543d9616cSwdenk board designers haven't used it for something that would 308643d9616cSwdenk cause you grief during the initial boot! It is frequently not 308743d9616cSwdenk used. 308843d9616cSwdenk 308943d9616cSwdenk CFG_INIT_RAM_ADDR should be somewhere that won't interfere 309043d9616cSwdenk with your processor/board/system design. The default value 309143d9616cSwdenk you will find in any recent u-boot distribution in 309243d9616cSwdenk Walnut405.h should work for you. I'd set it to a value larger 309343d9616cSwdenk than your SDRAM module. If you have a 64MB SDRAM module, set 309443d9616cSwdenk it above 400_0000. Just make sure your board has no resources 309543d9616cSwdenk that are supposed to respond to that address! That code in 309643d9616cSwdenk start.S has been around a while and should work as is when 309743d9616cSwdenk you get the config right. 309843d9616cSwdenk 309943d9616cSwdenk -Chris Hallinan 310043d9616cSwdenk DS4.COM, Inc. 310143d9616cSwdenk 3102c609719bSwdenkIt is essential to remember this, since it has some impact on the C 3103c609719bSwdenkcode for the initialization procedures: 3104c609719bSwdenk 3105c609719bSwdenk* Initialized global data (data segment) is read-only. Do not attempt 3106c609719bSwdenk to write it. 3107c609719bSwdenk 3108c609719bSwdenk* Do not use any unitialized global data (or implicitely initialized 3109c609719bSwdenk as zero data - BSS segment) at all - this is undefined, initiali- 31107152b1d0Swdenk zation is performed later (when relocating to RAM). 3111c609719bSwdenk 3112c609719bSwdenk* Stack space is very limited. Avoid big data buffers or things like 3113c609719bSwdenk that. 3114c609719bSwdenk 3115c609719bSwdenkHaving only the stack as writable memory limits means we cannot use 3116c609719bSwdenknormal global data to share information beween the code. But it 3117c609719bSwdenkturned out that the implementation of U-Boot can be greatly 3118c609719bSwdenksimplified by making a global data structure (gd_t) available to all 3119c609719bSwdenkfunctions. We could pass a pointer to this data as argument to _all_ 3120c609719bSwdenkfunctions, but this would bloat the code. Instead we use a feature of 3121c609719bSwdenkthe GCC compiler (Global Register Variables) to share the data: we 3122c609719bSwdenkplace a pointer (gd) to the global data into a register which we 3123c609719bSwdenkreserve for this purpose. 3124c609719bSwdenk 31257152b1d0SwdenkWhen choosing a register for such a purpose we are restricted by the 3126c609719bSwdenkrelevant (E)ABI specifications for the current architecture, and by 3127c609719bSwdenkGCC's implementation. 3128c609719bSwdenk 3129c609719bSwdenkFor PowerPC, the following registers have specific use: 3130c609719bSwdenk R1: stack pointer 3131c609719bSwdenk R2: TOC pointer 3132c609719bSwdenk R3-R4: parameter passing and return values 3133c609719bSwdenk R5-R10: parameter passing 3134c609719bSwdenk R13: small data area pointer 3135c609719bSwdenk R30: GOT pointer 3136c609719bSwdenk R31: frame pointer 3137c609719bSwdenk 3138c609719bSwdenk (U-Boot also uses R14 as internal GOT pointer.) 3139c609719bSwdenk 3140c609719bSwdenk ==> U-Boot will use R29 to hold a pointer to the global data 3141c609719bSwdenk 3142c609719bSwdenk Note: on PPC, we could use a static initializer (since the 3143c609719bSwdenk address of the global data structure is known at compile time), 3144c609719bSwdenk but it turned out that reserving a register results in somewhat 3145c609719bSwdenk smaller code - although the code savings are not that big (on 3146c609719bSwdenk average for all boards 752 bytes for the whole U-Boot image, 3147c609719bSwdenk 624 text + 127 data). 3148c609719bSwdenk 3149c609719bSwdenkOn ARM, the following registers are used: 3150c609719bSwdenk 3151c609719bSwdenk R0: function argument word/integer result 3152c609719bSwdenk R1-R3: function argument word 3153c609719bSwdenk R9: GOT pointer 3154c609719bSwdenk R10: stack limit (used only if stack checking if enabled) 3155c609719bSwdenk R11: argument (frame) pointer 3156c609719bSwdenk R12: temporary workspace 3157c609719bSwdenk R13: stack pointer 3158c609719bSwdenk R14: link register 3159c609719bSwdenk R15: program counter 3160c609719bSwdenk 3161c609719bSwdenk ==> U-Boot will use R8 to hold a pointer to the global data 3162c609719bSwdenk 3163c609719bSwdenk 3164c609719bSwdenkMemory Management: 3165c609719bSwdenk------------------ 3166c609719bSwdenk 3167c609719bSwdenkU-Boot runs in system state and uses physical addresses, i.e. the 3168c609719bSwdenkMMU is not used either for address mapping nor for memory protection. 3169c609719bSwdenk 3170c609719bSwdenkThe available memory is mapped to fixed addresses using the memory 3171c609719bSwdenkcontroller. In this process, a contiguous block is formed for each 3172c609719bSwdenkmemory type (Flash, SDRAM, SRAM), even when it consists of several 3173c609719bSwdenkphysical memory banks. 3174c609719bSwdenk 3175c609719bSwdenkU-Boot is installed in the first 128 kB of the first Flash bank (on 3176c609719bSwdenkTQM8xxL modules this is the range 0x40000000 ... 0x4001FFFF). After 3177c609719bSwdenkbooting and sizing and initializing DRAM, the code relocates itself 3178c609719bSwdenkto the upper end of DRAM. Immediately below the U-Boot code some 3179c609719bSwdenkmemory is reserved for use by malloc() [see CFG_MALLOC_LEN 3180c609719bSwdenkconfiguration setting]. Below that, a structure with global Board 3181c609719bSwdenkInfo data is placed, followed by the stack (growing downward). 3182c609719bSwdenk 3183c609719bSwdenkAdditionally, some exception handler code is copied to the low 8 kB 3184c609719bSwdenkof DRAM (0x00000000 ... 0x00001FFF). 3185c609719bSwdenk 3186c609719bSwdenkSo a typical memory configuration with 16 MB of DRAM could look like 3187c609719bSwdenkthis: 3188c609719bSwdenk 3189c609719bSwdenk 0x0000 0000 Exception Vector code 3190c609719bSwdenk : 3191c609719bSwdenk 0x0000 1FFF 3192c609719bSwdenk 0x0000 2000 Free for Application Use 3193c609719bSwdenk : 3194c609719bSwdenk : 3195c609719bSwdenk 3196c609719bSwdenk : 3197c609719bSwdenk : 3198c609719bSwdenk 0x00FB FF20 Monitor Stack (Growing downward) 3199c609719bSwdenk 0x00FB FFAC Board Info Data and permanent copy of global data 3200c609719bSwdenk 0x00FC 0000 Malloc Arena 3201c609719bSwdenk : 3202c609719bSwdenk 0x00FD FFFF 3203c609719bSwdenk 0x00FE 0000 RAM Copy of Monitor Code 3204c609719bSwdenk ... eventually: LCD or video framebuffer 3205c609719bSwdenk ... eventually: pRAM (Protected RAM - unchanged by reset) 3206c609719bSwdenk 0x00FF FFFF [End of RAM] 3207c609719bSwdenk 3208c609719bSwdenk 3209c609719bSwdenkSystem Initialization: 3210c609719bSwdenk---------------------- 3211c609719bSwdenk 3212c609719bSwdenkIn the reset configuration, U-Boot starts at the reset entry point 3213c609719bSwdenk(on most PowerPC systens at address 0x00000100). Because of the reset 3214c609719bSwdenkconfiguration for CS0# this is a mirror of the onboard Flash memory. 32157152b1d0SwdenkTo be able to re-map memory U-Boot then jumps to its link address. 3216c609719bSwdenkTo be able to implement the initialization code in C, a (small!) 3217c609719bSwdenkinitial stack is set up in the internal Dual Ported RAM (in case CPUs 3218c609719bSwdenkwhich provide such a feature like MPC8xx or MPC8260), or in a locked 3219c609719bSwdenkpart of the data cache. After that, U-Boot initializes the CPU core, 3220c609719bSwdenkthe caches and the SIU. 3221c609719bSwdenk 3222c609719bSwdenkNext, all (potentially) available memory banks are mapped using a 3223c609719bSwdenkpreliminary mapping. For example, we put them on 512 MB boundaries 3224c609719bSwdenk(multiples of 0x20000000: SDRAM on 0x00000000 and 0x20000000, Flash 3225c609719bSwdenkon 0x40000000 and 0x60000000, SRAM on 0x80000000). Then UPM A is 3226c609719bSwdenkprogrammed for SDRAM access. Using the temporary configuration, a 3227c609719bSwdenksimple memory test is run that determines the size of the SDRAM 3228c609719bSwdenkbanks. 3229c609719bSwdenk 3230c609719bSwdenkWhen there is more than one SDRAM bank, and the banks are of 32317152b1d0Swdenkdifferent size, the largest is mapped first. For equal size, the first 3232c609719bSwdenkbank (CS2#) is mapped first. The first mapping is always for address 3233c609719bSwdenk0x00000000, with any additional banks following immediately to create 3234c609719bSwdenkcontiguous memory starting from 0. 3235c609719bSwdenk 3236c609719bSwdenkThen, the monitor installs itself at the upper end of the SDRAM area 3237c609719bSwdenkand allocates memory for use by malloc() and for the global Board 3238c609719bSwdenkInfo data; also, the exception vector code is copied to the low RAM 3239c609719bSwdenkpages, and the final stack is set up. 3240c609719bSwdenk 3241c609719bSwdenkOnly after this relocation will you have a "normal" C environment; 3242c609719bSwdenkuntil that you are restricted in several ways, mostly because you are 3243c609719bSwdenkrunning from ROM, and because the code will have to be relocated to a 3244c609719bSwdenknew address in RAM. 3245c609719bSwdenk 3246c609719bSwdenk 3247c609719bSwdenkU-Boot Porting Guide: 3248c609719bSwdenk---------------------- 3249c609719bSwdenk 3250c609719bSwdenk[Based on messages by Jerry Van Baren in the U-Boot-Users mailing 32516aff3115Swdenklist, October 2002] 3252c609719bSwdenk 3253c609719bSwdenk 3254c609719bSwdenkint main (int argc, char *argv[]) 3255c609719bSwdenk{ 3256c609719bSwdenk sighandler_t no_more_time; 3257c609719bSwdenk 3258c609719bSwdenk signal (SIGALRM, no_more_time); 3259c609719bSwdenk alarm (PROJECT_DEADLINE - toSec (3 * WEEK)); 3260c609719bSwdenk 3261c609719bSwdenk if (available_money > available_manpower) { 3262c609719bSwdenk pay consultant to port U-Boot; 3263c609719bSwdenk return 0; 3264c609719bSwdenk } 3265c609719bSwdenk 3266c609719bSwdenk Download latest U-Boot source; 3267c609719bSwdenk 32686aff3115Swdenk Subscribe to u-boot-users mailing list; 32696aff3115Swdenk 3270c609719bSwdenk if (clueless) { 3271c609719bSwdenk email ("Hi, I am new to U-Boot, how do I get started?"); 3272c609719bSwdenk } 3273c609719bSwdenk 3274c609719bSwdenk while (learning) { 3275c609719bSwdenk Read the README file in the top level directory; 32767cb22f97Swdenk Read http://www.denx.de/twiki/bin/view/DULG/Manual ; 3277c609719bSwdenk Read the source, Luke; 3278c609719bSwdenk } 3279c609719bSwdenk 3280c609719bSwdenk if (available_money > toLocalCurrency ($2500)) { 3281c609719bSwdenk Buy a BDI2000; 3282c609719bSwdenk } else { 3283c609719bSwdenk Add a lot of aggravation and time; 3284c609719bSwdenk } 3285c609719bSwdenk 3286c609719bSwdenk Create your own board support subdirectory; 3287c609719bSwdenk 32886aff3115Swdenk Create your own board config file; 32896aff3115Swdenk 3290c609719bSwdenk while (!running) { 3291c609719bSwdenk do { 3292c609719bSwdenk Add / modify source code; 3293c609719bSwdenk } until (compiles); 3294c609719bSwdenk Debug; 3295c609719bSwdenk if (clueless) 3296c609719bSwdenk email ("Hi, I am having problems..."); 3297c609719bSwdenk } 3298c609719bSwdenk Send patch file to Wolfgang; 3299c609719bSwdenk 3300c609719bSwdenk return 0; 3301c609719bSwdenk} 3302c609719bSwdenk 3303c609719bSwdenkvoid no_more_time (int sig) 3304c609719bSwdenk{ 3305c609719bSwdenk hire_a_guru(); 3306c609719bSwdenk} 3307c609719bSwdenk 3308c609719bSwdenk 3309c609719bSwdenkCoding Standards: 3310c609719bSwdenk----------------- 3311c609719bSwdenk 3312c609719bSwdenkAll contributions to U-Boot should conform to the Linux kernel 3313c609719bSwdenkcoding style; see the file "Documentation/CodingStyle" in your Linux 3314c609719bSwdenkkernel source directory. 3315c609719bSwdenk 3316c609719bSwdenkPlease note that U-Boot is implemented in C (and to some small parts 3317c609719bSwdenkin Assembler); no C++ is used, so please do not use C++ style 3318c609719bSwdenkcomments (//) in your code. 3319c609719bSwdenk 3320c178d3daSwdenkPlease also stick to the following formatting rules: 3321180d3f74Swdenk- remove any trailing white space 3322180d3f74Swdenk- use TAB characters for indentation, not spaces 3323180d3f74Swdenk- make sure NOT to use DOS '\r\n' line feeds 3324180d3f74Swdenk- do not add more than 2 empty lines to source files 3325180d3f74Swdenk- do not add trailing empty lines to source files 3326180d3f74Swdenk 3327c609719bSwdenkSubmissions which do not conform to the standards may be returned 3328c609719bSwdenkwith a request to reformat the changes. 3329c609719bSwdenk 3330c609719bSwdenk 3331c609719bSwdenkSubmitting Patches: 3332c609719bSwdenk------------------- 3333c609719bSwdenk 3334c609719bSwdenkSince the number of patches for U-Boot is growing, we need to 3335c609719bSwdenkestablish some rules. Submissions which do not conform to these rules 3336c609719bSwdenkmay be rejected, even when they contain important and valuable stuff. 3337c609719bSwdenk 3338c609719bSwdenk 3339c609719bSwdenkWhen you send a patch, please include the following information with 3340c609719bSwdenkit: 3341c609719bSwdenk 3342c609719bSwdenk* For bug fixes: a description of the bug and how your patch fixes 3343c609719bSwdenk this bug. Please try to include a way of demonstrating that the 3344c609719bSwdenk patch actually fixes something. 3345c609719bSwdenk 3346c609719bSwdenk* For new features: a description of the feature and your 3347c609719bSwdenk implementation. 3348c609719bSwdenk 3349c609719bSwdenk* A CHANGELOG entry as plaintext (separate from the patch) 3350c609719bSwdenk 3351c609719bSwdenk* For major contributions, your entry to the CREDITS file 3352c609719bSwdenk 3353c609719bSwdenk* When you add support for a new board, don't forget to add this 3354c609719bSwdenk board to the MAKEALL script, too. 3355c609719bSwdenk 3356c609719bSwdenk* If your patch adds new configuration options, don't forget to 3357c609719bSwdenk document these in the README file. 3358c609719bSwdenk 3359c609719bSwdenk* The patch itself. If you are accessing the CVS repository use "cvs 3360c609719bSwdenk update; cvs diff -puRN"; else, use "diff -purN OLD NEW". If your 3361c609719bSwdenk version of diff does not support these options, then get the latest 3362c609719bSwdenk version of GNU diff. 3363c609719bSwdenk 33646dff5529Swdenk The current directory when running this command shall be the top 33656dff5529Swdenk level directory of the U-Boot source tree, or it's parent directory 33666dff5529Swdenk (i. e. please make sure that your patch includes sufficient 33676dff5529Swdenk directory information for the affected files). 33686dff5529Swdenk 3369c609719bSwdenk We accept patches as plain text, MIME attachments or as uuencoded 3370c609719bSwdenk gzipped text. 3371c609719bSwdenk 337252f52c14Swdenk* If one logical set of modifications affects or creates several 337352f52c14Swdenk files, all these changes shall be submitted in a SINGLE patch file. 337452f52c14Swdenk 337552f52c14Swdenk* Changesets that contain different, unrelated modifications shall be 337652f52c14Swdenk submitted as SEPARATE patches, one patch per changeset. 337752f52c14Swdenk 337852f52c14Swdenk 3379c609719bSwdenkNotes: 3380c609719bSwdenk 3381c609719bSwdenk* Before sending the patch, run the MAKEALL script on your patched 3382c609719bSwdenk source tree and make sure that no errors or warnings are reported 3383c609719bSwdenk for any of the boards. 3384c609719bSwdenk 3385c609719bSwdenk* Keep your modifications to the necessary minimum: A patch 3386c609719bSwdenk containing several unrelated changes or arbitrary reformats will be 3387c609719bSwdenk returned with a request to re-formatting / split it. 3388c609719bSwdenk 3389c609719bSwdenk* If you modify existing code, make sure that your new code does not 3390c609719bSwdenk add to the memory footprint of the code ;-) Small is beautiful! 3391c609719bSwdenk When adding new features, these should compile conditionally only 3392c609719bSwdenk (using #ifdef), and the resulting code with the new feature 3393c609719bSwdenk disabled must not need more memory than the old code without your 3394c609719bSwdenk modification. 3395