1c609719bSwdenk# 2151ab83aSwdenk# (C) Copyright 2000 - 2005 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 28e86e5a07SwdenkEmbedded boards based on PowerPC, ARM, MIPS and several other 29e86e5a07Swdenkprocessors, which can be installed in a boot ROM and used to 30e86e5a07Swdenkinitialize and test the hardware or to download and run application 31e86e5a07Swdenkcode. 32c609719bSwdenk 33c609719bSwdenkThe development of U-Boot is closely related to Linux: some parts of 3424ee89b9Swdenkthe source code originate in the Linux source tree, we have some 3524ee89b9Swdenkheader files in common, and special provision has been made to 36c609719bSwdenksupport booting of Linux images. 37c609719bSwdenk 38c609719bSwdenkSome attention has been paid to make this software easily 39c609719bSwdenkconfigurable and extendable. For instance, all monitor commands are 40c609719bSwdenkimplemented with the same call interface, so that it's very easy to 41c609719bSwdenkadd new commands. Also, instead of permanently adding rarely used 42c609719bSwdenkcode (for instance hardware test utilities) to the monitor, you can 43c609719bSwdenkload and run it dynamically. 44c609719bSwdenk 45c609719bSwdenk 46c609719bSwdenkStatus: 47c609719bSwdenk======= 48c609719bSwdenk 49c609719bSwdenkIn general, all boards for which a configuration option exists in the 50c609719bSwdenkMakefile have been tested to some extent and can be considered 51c609719bSwdenk"working". In fact, many of them are used in production systems. 52c609719bSwdenk 53c609719bSwdenkIn case of problems see the CHANGELOG and CREDITS files to find out 54c609719bSwdenkwho contributed the specific port. 55c609719bSwdenk 56c609719bSwdenk 57c609719bSwdenkWhere to get help: 58c609719bSwdenk================== 59c609719bSwdenk 60c609719bSwdenkIn case you have questions about, problems with or contributions for 61c609719bSwdenkU-Boot you should send a message to the U-Boot mailing list at 62c609719bSwdenk<u-boot-users@lists.sourceforge.net>. There is also an archive of 63c609719bSwdenkprevious traffic on the mailing list - please search the archive 64c609719bSwdenkbefore asking FAQ's. Please see 65c609719bSwdenkhttp://lists.sourceforge.net/lists/listinfo/u-boot-users/ 66c609719bSwdenk 67c609719bSwdenk 68c609719bSwdenkWhere we come from: 69c609719bSwdenk=================== 70c609719bSwdenk 71c609719bSwdenk- start from 8xxrom sources 7224ee89b9Swdenk- create PPCBoot project (http://sourceforge.net/projects/ppcboot) 73c609719bSwdenk- clean up code 74c609719bSwdenk- make it easier to add custom boards 75c609719bSwdenk- make it possible to add other [PowerPC] CPUs 76c609719bSwdenk- extend functions, especially: 77c609719bSwdenk * Provide extended interface to Linux boot loader 78c609719bSwdenk * S-Record download 79c609719bSwdenk * network boot 80c609719bSwdenk * PCMCIA / CompactFLash / ATA disk / SCSI ... boot 8124ee89b9Swdenk- create ARMBoot project (http://sourceforge.net/projects/armboot) 82c609719bSwdenk- add other CPU families (starting with ARM) 8324ee89b9Swdenk- create U-Boot project (http://sourceforge.net/projects/u-boot) 8424ee89b9Swdenk 8524ee89b9Swdenk 8624ee89b9SwdenkNames and Spelling: 8724ee89b9Swdenk=================== 8824ee89b9Swdenk 8924ee89b9SwdenkThe "official" name of this project is "Das U-Boot". The spelling 9024ee89b9Swdenk"U-Boot" shall be used in all written text (documentation, comments 9124ee89b9Swdenkin source files etc.). Example: 9224ee89b9Swdenk 9324ee89b9Swdenk This is the README file for the U-Boot project. 9424ee89b9Swdenk 9524ee89b9SwdenkFile names etc. shall be based on the string "u-boot". Examples: 9624ee89b9Swdenk 9724ee89b9Swdenk include/asm-ppc/u-boot.h 9824ee89b9Swdenk 9924ee89b9Swdenk #include <asm/u-boot.h> 10024ee89b9Swdenk 10124ee89b9SwdenkVariable names, preprocessor constants etc. shall be either based on 10224ee89b9Swdenkthe string "u_boot" or on "U_BOOT". Example: 10324ee89b9Swdenk 10424ee89b9Swdenk U_BOOT_VERSION u_boot_logo 10524ee89b9Swdenk IH_OS_U_BOOT u_boot_hush_start 106c609719bSwdenk 107c609719bSwdenk 10893f19cc0SwdenkVersioning: 10993f19cc0Swdenk=========== 11093f19cc0Swdenk 11193f19cc0SwdenkU-Boot uses a 3 level version number containing a version, a 11293f19cc0Swdenksub-version, and a patchlevel: "U-Boot-2.34.5" means version "2", 11393f19cc0Swdenksub-version "34", and patchlevel "4". 11493f19cc0Swdenk 11593f19cc0SwdenkThe patchlevel is used to indicate certain stages of development 11693f19cc0Swdenkbetween released versions, i. e. officially released versions of 11793f19cc0SwdenkU-Boot will always have a patchlevel of "0". 11893f19cc0Swdenk 11993f19cc0Swdenk 120c609719bSwdenkDirectory Hierarchy: 121c609719bSwdenk==================== 122c609719bSwdenk 1237152b1d0Swdenk- board Board dependent files 1247152b1d0Swdenk- common Misc architecture independent functions 125c609719bSwdenk- cpu CPU specific files 126983fda83Swdenk - 74xx_7xx Files specific to Freescale MPC74xx and 7xx CPUs 12711dadd54Swdenk - arm720t Files specific to ARM 720 CPUs 12811dadd54Swdenk - arm920t Files specific to ARM 920 CPUs 129a85f9f21Swdenk - at91rm9200 Files specific to Atmel AT91RM9200 CPU 130983fda83Swdenk - imx Files specific to Freescale MC9328 i.MX CPUs 1311d9f4105Swdenk - s3c24x0 Files specific to Samsung S3C24X0 CPUs 13211dadd54Swdenk - arm925t Files specific to ARM 925 CPUs 13311dadd54Swdenk - arm926ejs Files specific to ARM 926 CPUs 1348ed96046Swdenk - arm1136 Files specific to ARM 1136 CPUs 13572a087e0SWolfgang Denk - at32ap Files specific to Atmel AVR32 AP CPUs 13611dadd54Swdenk - i386 Files specific to i386 CPUs 13711dadd54Swdenk - ixp Files specific to Intel XScale IXP CPUs 138983fda83Swdenk - mcf52x2 Files specific to Freescale ColdFire MCF52x2 CPUs 13911dadd54Swdenk - mips Files specific to MIPS CPUs 140983fda83Swdenk - mpc5xx Files specific to Freescale MPC5xx CPUs 141983fda83Swdenk - mpc5xxx Files specific to Freescale MPC5xxx CPUs 142983fda83Swdenk - mpc8xx Files specific to Freescale MPC8xx CPUs 143983fda83Swdenk - mpc8220 Files specific to Freescale MPC8220 CPUs 144983fda83Swdenk - mpc824x Files specific to Freescale MPC824x CPUs 145983fda83Swdenk - mpc8260 Files specific to Freescale MPC8260 CPUs 146983fda83Swdenk - mpc85xx Files specific to Freescale MPC85xx CPUs 14711dadd54Swdenk - nios Files specific to Altera NIOS CPUs 1485c952cf0Swdenk - nios2 Files specific to Altera Nios-II CPUs 1490c8721a4SWolfgang Denk - ppc4xx Files specific to AMCC PowerPC 4xx CPUs 15011dadd54Swdenk - pxa Files specific to Intel XScale PXA CPUs 15111dadd54Swdenk - s3c44b0 Files specific to Samsung S3C44B0 CPUs 15211dadd54Swdenk - sa1100 Files specific to Intel StrongARM SA1100 CPUs 153c609719bSwdenk- disk Code for disk drive partition handling 154c609719bSwdenk- doc Documentation (don't expect too much) 1557152b1d0Swdenk- drivers Commonly used device drivers 156c609719bSwdenk- dtt Digital Thermometer and Thermostat drivers 157c609719bSwdenk- examples Example code for standalone applications, etc. 158c609719bSwdenk- include Header Files 15911dadd54Swdenk- lib_arm Files generic to ARM architecture 1607b64fef3SWolfgang Denk- lib_avr32 Files generic to AVR32 architecture 16111dadd54Swdenk- lib_generic Files generic to all architectures 16211dadd54Swdenk- lib_i386 Files generic to i386 architecture 16311dadd54Swdenk- lib_m68k Files generic to m68k architecture 16411dadd54Swdenk- lib_mips Files generic to MIPS architecture 16511dadd54Swdenk- lib_nios Files generic to NIOS architecture 16611dadd54Swdenk- lib_ppc Files generic to PowerPC architecture 167213bf8c8SGerald Van Baren- libfdt Library files to support flattened device trees 168c609719bSwdenk- net Networking code 169c609719bSwdenk- post Power On Self Test 170c609719bSwdenk- rtc Real Time Clock drivers 171c609719bSwdenk- tools Tools to build S-Record or U-Boot images, etc. 172c609719bSwdenk 173c609719bSwdenkSoftware Configuration: 174c609719bSwdenk======================= 175c609719bSwdenk 176c609719bSwdenkConfiguration is usually done using C preprocessor defines; the 177c609719bSwdenkrationale behind that is to avoid dead code whenever possible. 178c609719bSwdenk 179c609719bSwdenkThere are two classes of configuration variables: 180c609719bSwdenk 181c609719bSwdenk* Configuration _OPTIONS_: 182c609719bSwdenk These are selectable by the user and have names beginning with 183c609719bSwdenk "CONFIG_". 184c609719bSwdenk 185c609719bSwdenk* Configuration _SETTINGS_: 186c609719bSwdenk These depend on the hardware etc. and should not be meddled with if 187c609719bSwdenk you don't know what you're doing; they have names beginning with 188c609719bSwdenk "CFG_". 189c609719bSwdenk 190c609719bSwdenkLater we will add a configuration tool - probably similar to or even 191c609719bSwdenkidentical to what's used for the Linux kernel. Right now, we have to 192c609719bSwdenkdo the configuration by hand, which means creating some symbolic 193c609719bSwdenklinks and editing some configuration files. We use the TQM8xxL boards 194c609719bSwdenkas an example here. 195c609719bSwdenk 196c609719bSwdenk 197c609719bSwdenkSelection of Processor Architecture and Board Type: 198c609719bSwdenk--------------------------------------------------- 199c609719bSwdenk 200c609719bSwdenkFor all supported boards there are ready-to-use default 201c609719bSwdenkconfigurations available; just type "make <board_name>_config". 202c609719bSwdenk 203c609719bSwdenkExample: For a TQM823L module type: 204c609719bSwdenk 205c609719bSwdenk cd u-boot 206c609719bSwdenk make TQM823L_config 207c609719bSwdenk 208c609719bSwdenkFor the Cogent platform, you need to specify the cpu type as well; 209c609719bSwdenke.g. "make cogent_mpc8xx_config". And also configure the cogent 210c609719bSwdenkdirectory according to the instructions in cogent/README. 211c609719bSwdenk 212c609719bSwdenk 213c609719bSwdenkConfiguration Options: 214c609719bSwdenk---------------------- 215c609719bSwdenk 216c609719bSwdenkConfiguration depends on the combination of board and CPU type; all 217c609719bSwdenksuch information is kept in a configuration file 218c609719bSwdenk"include/configs/<board_name>.h". 219c609719bSwdenk 220c609719bSwdenkExample: For a TQM823L module, all configuration settings are in 221c609719bSwdenk"include/configs/TQM823L.h". 222c609719bSwdenk 223c609719bSwdenk 2247f6c2cbcSwdenkMany of the options are named exactly as the corresponding Linux 2257f6c2cbcSwdenkkernel configuration options. The intention is to make it easier to 2267f6c2cbcSwdenkbuild a config tool - later. 2277f6c2cbcSwdenk 2287f6c2cbcSwdenk 229c609719bSwdenkThe following options need to be configured: 230c609719bSwdenk 231c609719bSwdenk- CPU Type: Define exactly one of 232c609719bSwdenk 233c609719bSwdenk PowerPC based CPUs: 234c609719bSwdenk ------------------- 235c609719bSwdenk CONFIG_MPC823, CONFIG_MPC850, CONFIG_MPC855, CONFIG_MPC860 2360db5bca8Swdenk or CONFIG_MPC5xx 237983fda83Swdenk or CONFIG_MPC8220 238c609719bSwdenk or CONFIG_MPC824X, CONFIG_MPC8260 23942d1f039Swdenk or CONFIG_MPC85xx 240c609719bSwdenk or CONFIG_IOP480 241c609719bSwdenk or CONFIG_405GP 24212f34241Swdenk or CONFIG_405EP 243c609719bSwdenk or CONFIG_440 244c609719bSwdenk or CONFIG_MPC74xx 24572755c71Swdenk or CONFIG_750FX 246c609719bSwdenk 247c609719bSwdenk ARM based CPUs: 248c609719bSwdenk --------------- 249c609719bSwdenk CONFIG_SA1110 250c609719bSwdenk CONFIG_ARM7 251c609719bSwdenk CONFIG_PXA250 2520b953ffcSMarkus Klotzbuecher CONFIG_CPU_MONAHANS 253c609719bSwdenk 254507bbe3eSwdenk MicroBlaze based CPUs: 255507bbe3eSwdenk ---------------------- 256857cad37Swdenk CONFIG_MICROBLAZE 257507bbe3eSwdenk 2585c952cf0Swdenk Nios-2 based CPUs: 2595c952cf0Swdenk ---------------------- 2605c952cf0Swdenk CONFIG_NIOS2 2615c952cf0Swdenk 26272a087e0SWolfgang Denk AVR32 based CPUs: 26372a087e0SWolfgang Denk ---------------------- 26472a087e0SWolfgang Denk CONFIG_AT32AP 265c609719bSwdenk 266c609719bSwdenk- Board Type: Define exactly one of 267c609719bSwdenk 268c609719bSwdenk PowerPC based boards: 269c609719bSwdenk --------------------- 270c609719bSwdenk 27176544f80SDetlev Zundel CONFIG_ADCIOP CONFIG_FPS860L CONFIG_OXC 27276544f80SDetlev Zundel CONFIG_ADS860 CONFIG_GEN860T CONFIG_PCI405 27376544f80SDetlev Zundel CONFIG_AMX860 CONFIG_GENIETV CONFIG_PCIPPC2 27476544f80SDetlev Zundel CONFIG_AP1000 CONFIG_GTH CONFIG_PCIPPC6 27576544f80SDetlev Zundel CONFIG_AR405 CONFIG_gw8260 CONFIG_pcu_e 27676544f80SDetlev Zundel CONFIG_BAB7xx CONFIG_hermes CONFIG_PIP405 27776544f80SDetlev Zundel CONFIG_BC3450 CONFIG_hymod CONFIG_PM826 27809e4b0c5SWolfgang Denk CONFIG_c2mon CONFIG_IAD210 CONFIG_ppmc8260 27909e4b0c5SWolfgang Denk CONFIG_CANBT CONFIG_ICU862 CONFIG_QS823 28009e4b0c5SWolfgang Denk CONFIG_CCM CONFIG_IP860 CONFIG_QS850 28109e4b0c5SWolfgang Denk CONFIG_CMI CONFIG_IPHASE4539 CONFIG_QS860T 28209e4b0c5SWolfgang Denk CONFIG_cogent_mpc8260 CONFIG_IVML24 CONFIG_RBC823 28309e4b0c5SWolfgang Denk CONFIG_cogent_mpc8xx CONFIG_IVML24_128 CONFIG_RPXClassic 28409e4b0c5SWolfgang Denk CONFIG_CPCI405 CONFIG_IVML24_256 CONFIG_RPXlite 28509e4b0c5SWolfgang Denk CONFIG_CPCI4052 CONFIG_IVMS8 CONFIG_RPXsuper 28609e4b0c5SWolfgang Denk CONFIG_CPCIISER4 CONFIG_IVMS8_128 CONFIG_rsdproto 28709e4b0c5SWolfgang Denk CONFIG_CPU86 CONFIG_IVMS8_256 CONFIG_sacsng 28809e4b0c5SWolfgang Denk CONFIG_CRAYL1 CONFIG_JSE CONFIG_Sandpoint8240 28909e4b0c5SWolfgang Denk CONFIG_CSB272 CONFIG_LANTEC CONFIG_Sandpoint8245 29009e4b0c5SWolfgang Denk CONFIG_CU824 CONFIG_LITE5200B CONFIG_sbc8260 29109e4b0c5SWolfgang Denk CONFIG_DASA_SIM CONFIG_lwmon CONFIG_sbc8560 29209e4b0c5SWolfgang Denk CONFIG_DB64360 CONFIG_MBX CONFIG_SM850 29309e4b0c5SWolfgang Denk CONFIG_DB64460 CONFIG_MBX860T CONFIG_SPD823TS 29409e4b0c5SWolfgang Denk CONFIG_DU405 CONFIG_MHPC CONFIG_STXGP3 29509e4b0c5SWolfgang Denk CONFIG_DUET_ADS CONFIG_MIP405 CONFIG_SXNI855T 29609e4b0c5SWolfgang Denk CONFIG_EBONY CONFIG_MOUSSE CONFIG_TQM823L 29709e4b0c5SWolfgang Denk CONFIG_ELPPC CONFIG_MPC8260ADS CONFIG_TQM8260 29809e4b0c5SWolfgang Denk CONFIG_ELPT860 CONFIG_MPC8540ADS CONFIG_TQM850L 29909e4b0c5SWolfgang Denk CONFIG_ep8260 CONFIG_MPC8540EVAL CONFIG_TQM855L 30009e4b0c5SWolfgang Denk CONFIG_ERIC CONFIG_MPC8560ADS CONFIG_TQM860L 30109e4b0c5SWolfgang Denk CONFIG_ESTEEM192E CONFIG_MUSENKI CONFIG_TTTech 30209e4b0c5SWolfgang Denk CONFIG_ETX094 CONFIG_MVS1 CONFIG_UTX8245 30309e4b0c5SWolfgang Denk CONFIG_EVB64260 CONFIG_NETPHONE CONFIG_V37 30409e4b0c5SWolfgang Denk CONFIG_FADS823 CONFIG_NETTA CONFIG_W7OLMC 30509e4b0c5SWolfgang Denk CONFIG_FADS850SAR CONFIG_NETVIA CONFIG_W7OLMG 30609e4b0c5SWolfgang Denk CONFIG_FADS860T CONFIG_NX823 CONFIG_WALNUT 30709e4b0c5SWolfgang Denk CONFIG_FLAGADM CONFIG_OCRTC CONFIG_ZPC1900 30809e4b0c5SWolfgang Denk CONFIG_FPS850L CONFIG_ORSG CONFIG_ZUMA 309c609719bSwdenk 310c609719bSwdenk ARM based boards: 311c609719bSwdenk ----------------- 312c609719bSwdenk 313c570b2fdSWolfgang Denk CONFIG_ARMADILLO, CONFIG_AT91RM9200DK, CONFIG_CERF250, 3140b953ffcSMarkus Klotzbuecher CONFIG_CSB637, CONFIG_DELTA, CONFIG_DNP1110, 3150b953ffcSMarkus Klotzbuecher CONFIG_EP7312, CONFIG_H2_OMAP1610, CONFIG_HHP_CRADLE, 3160b953ffcSMarkus Klotzbuecher CONFIG_IMPA7, CONFIG_INNOVATOROMAP1510, CONFIG_INNOVATOROMAP1610, 3170b953ffcSMarkus Klotzbuecher CONFIG_KB9202, CONFIG_LART, CONFIG_LPD7A400, 3180b953ffcSMarkus Klotzbuecher CONFIG_LUBBOCK, CONFIG_OSK_OMAP5912, CONFIG_OMAP2420H4, 3195720df78SHeiko Schocher CONFIG_PLEB2, CONFIG_SHANNON, CONFIG_P2_OMAP730, 3205720df78SHeiko Schocher CONFIG_SMDK2400, CONFIG_SMDK2410, CONFIG_TRAB, 3215720df78SHeiko Schocher CONFIG_VCMA9 322c609719bSwdenk 323507bbe3eSwdenk MicroBlaze based boards: 324507bbe3eSwdenk ------------------------ 325507bbe3eSwdenk 326507bbe3eSwdenk CONFIG_SUZAKU 327507bbe3eSwdenk 3285c952cf0Swdenk Nios-2 based boards: 3295c952cf0Swdenk ------------------------ 3305c952cf0Swdenk 3315c952cf0Swdenk CONFIG_PCI5441 CONFIG_PK1C20 3329cc83378SScott McNutt CONFIG_EP1C20 CONFIG_EP1S10 CONFIG_EP1S40 3335c952cf0Swdenk 3346ccec449SWolfgang Denk AVR32 based boards: 3356ccec449SWolfgang Denk ------------------- 3366ccec449SWolfgang Denk 3376ccec449SWolfgang Denk CONFIG_ATSTK1000 3386ccec449SWolfgang Denk 3396ccec449SWolfgang Denk- CPU Daughterboard Type: (if CONFIG_ATSTK1000 is defined) 3406ccec449SWolfgang Denk Define exactly one of 3416ccec449SWolfgang Denk CONFIG_ATSTK1002 3426ccec449SWolfgang Denk 343c609719bSwdenk 344c609719bSwdenk- CPU Module Type: (if CONFIG_COGENT is defined) 345c609719bSwdenk Define exactly one of 346c609719bSwdenk CONFIG_CMA286_60_OLD 347c609719bSwdenk--- FIXME --- not tested yet: 348c609719bSwdenk CONFIG_CMA286_60, CONFIG_CMA286_21, CONFIG_CMA286_60P, 349c609719bSwdenk CONFIG_CMA287_23, CONFIG_CMA287_50 350c609719bSwdenk 351c609719bSwdenk- Motherboard Type: (if CONFIG_COGENT is defined) 352c609719bSwdenk Define exactly one of 353c609719bSwdenk CONFIG_CMA101, CONFIG_CMA102 354c609719bSwdenk 355c609719bSwdenk- Motherboard I/O Modules: (if CONFIG_COGENT is defined) 356c609719bSwdenk Define one or more of 357c609719bSwdenk CONFIG_CMA302 358c609719bSwdenk 359c609719bSwdenk- Motherboard Options: (if CONFIG_CMA101 or CONFIG_CMA102 are defined) 360c609719bSwdenk Define one or more of 361c609719bSwdenk CONFIG_LCD_HEARTBEAT - update a character position on 362c609719bSwdenk the lcd display every second with 363c609719bSwdenk a "rotator" |\-/|\-/ 364c609719bSwdenk 3652535d602Swdenk- Board flavour: (if CONFIG_MPC8260ADS is defined) 3662535d602Swdenk CONFIG_ADSTYPE 3672535d602Swdenk Possible values are: 3682535d602Swdenk CFG_8260ADS - original MPC8260ADS 369180d3f74Swdenk CFG_8266ADS - MPC8266ADS 37054387ac9Swdenk CFG_PQ2FADS - PQ2FADS-ZU or PQ2FADS-VR 37104a85b3bSwdenk CFG_8272ADS - MPC8272ADS 3722535d602Swdenk 373c609719bSwdenk- MPC824X Family Member (if CONFIG_MPC824X is defined) 374c609719bSwdenk Define exactly one of 375c609719bSwdenk CONFIG_MPC8240, CONFIG_MPC8245 376c609719bSwdenk 37775d1ea7fSwdenk- 8xx CPU Options: (if using an MPC8xx cpu) 37866ca92a5Swdenk CONFIG_8xx_GCLK_FREQ - deprecated: CPU clock if 37966ca92a5Swdenk get_gclk_freq() cannot work 3805da627a4Swdenk e.g. if there is no 32KHz 3815da627a4Swdenk reference PIT/RTC clock 38266ca92a5Swdenk CONFIG_8xx_OSCLK - PLL input clock (either EXTCLK 38366ca92a5Swdenk or XTAL/EXTAL) 384c609719bSwdenk 38566ca92a5Swdenk- 859/866/885 CPU options: (if using a MPC859 or MPC866 or MPC885 CPU): 38666ca92a5Swdenk CFG_8xx_CPUCLK_MIN 38766ca92a5Swdenk CFG_8xx_CPUCLK_MAX 38866ca92a5Swdenk CONFIG_8xx_CPUCLK_DEFAULT 38975d1ea7fSwdenk See doc/README.MPC866 39075d1ea7fSwdenk 39175d1ea7fSwdenk CFG_MEASURE_CPUCLK 39275d1ea7fSwdenk 39375d1ea7fSwdenk Define this to measure the actual CPU clock instead 39475d1ea7fSwdenk of relying on the correctness of the configured 39575d1ea7fSwdenk values. Mostly useful for board bringup to make sure 39675d1ea7fSwdenk the PLL is locked at the intended frequency. Note 39775d1ea7fSwdenk that this requires a (stable) reference clock (32 kHz 39866ca92a5Swdenk RTC clock or CFG_8XX_XIN) 39975d1ea7fSwdenk 4000b953ffcSMarkus Klotzbuecher- Intel Monahans options: 4010b953ffcSMarkus Klotzbuecher CFG_MONAHANS_RUN_MODE_OSC_RATIO 4020b953ffcSMarkus Klotzbuecher 4030b953ffcSMarkus Klotzbuecher Defines the Monahans run mode to oscillator 4040b953ffcSMarkus Klotzbuecher ratio. Valid values are 8, 16, 24, 31. The core 4050b953ffcSMarkus Klotzbuecher frequency is this value multiplied by 13 MHz. 4060b953ffcSMarkus Klotzbuecher 4070b953ffcSMarkus Klotzbuecher CFG_MONAHANS_TURBO_RUN_MODE_RATIO 4080b953ffcSMarkus Klotzbuecher 4090b953ffcSMarkus Klotzbuecher Defines the Monahans turbo mode to oscillator 4100b953ffcSMarkus Klotzbuecher ratio. Valid values are 1 (default if undefined) and 4110b953ffcSMarkus Klotzbuecher 2. The core frequency as calculated above is multiplied 4120b953ffcSMarkus Klotzbuecher by this value. 4130b953ffcSMarkus Klotzbuecher 4145da627a4Swdenk- Linux Kernel Interface: 415c609719bSwdenk CONFIG_CLOCKS_IN_MHZ 416c609719bSwdenk 417c609719bSwdenk U-Boot stores all clock information in Hz 418c609719bSwdenk internally. For binary compatibility with older Linux 419c609719bSwdenk kernels (which expect the clocks passed in the 420c609719bSwdenk bd_info data to be in MHz) the environment variable 421c609719bSwdenk "clocks_in_mhz" can be defined so that U-Boot 422c609719bSwdenk converts clock data to MHZ before passing it to the 423c609719bSwdenk Linux kernel. 424c609719bSwdenk When CONFIG_CLOCKS_IN_MHZ is defined, a definition of 425c609719bSwdenk "clocks_in_mhz=1" is automatically included in the 426c609719bSwdenk default environment. 427c609719bSwdenk 4285da627a4Swdenk CONFIG_MEMSIZE_IN_BYTES [relevant for MIPS only] 4295da627a4Swdenk 4305da627a4Swdenk When transfering memsize parameter to linux, some versions 4315da627a4Swdenk expect it to be in bytes, others in MB. 4325da627a4Swdenk Define CONFIG_MEMSIZE_IN_BYTES to make it in bytes. 4335da627a4Swdenk 434213bf8c8SGerald Van Baren CONFIG_OF_LIBFDT / CONFIG_OF_FLAT_TREE 435f57f70aaSWolfgang Denk 436f57f70aaSWolfgang Denk New kernel versions are expecting firmware settings to be 437213bf8c8SGerald Van Baren passed using flattened device trees (based on open firmware 438213bf8c8SGerald Van Baren concepts). 439213bf8c8SGerald Van Baren 440213bf8c8SGerald Van Baren CONFIG_OF_LIBFDT 441213bf8c8SGerald Van Baren * New libfdt-based support 442213bf8c8SGerald Van Baren * Adds the "fdt" command 443213bf8c8SGerald Van Baren * The bootm command does _not_ modify the fdt 444213bf8c8SGerald Van Baren 445213bf8c8SGerald Van Baren CONFIG_OF_FLAT_TREE 446213bf8c8SGerald Van Baren * Deprecated, see CONFIG_OF_LIBFDT 447213bf8c8SGerald Van Baren * Original ft_build.c-based support 448213bf8c8SGerald Van Baren * Automatically modifies the dft as part of the bootm command 449213bf8c8SGerald Van Baren * The environment variable "disable_of", when set, 450213bf8c8SGerald Van Baren disables this functionality. 451f57f70aaSWolfgang Denk 452f57f70aaSWolfgang Denk CONFIG_OF_FLAT_TREE_MAX_SIZE 453f57f70aaSWolfgang Denk 454f57f70aaSWolfgang Denk The maximum size of the constructed OF tree. 455f57f70aaSWolfgang Denk 456f57f70aaSWolfgang Denk OF_CPU - The proper name of the cpus node. 457c2871f03SKumar Gala OF_SOC - The proper name of the soc node. 458f57f70aaSWolfgang Denk OF_TBCLK - The timebase frequency. 459c2871f03SKumar Gala OF_STDOUT_PATH - The path to the console device 460f57f70aaSWolfgang Denk 461e4f880edSKumar Gala CONFIG_OF_HAS_BD_T 462e4f880edSKumar Gala 463213bf8c8SGerald Van Baren * CONFIG_OF_LIBFDT - enables the "fdt bd_t" command 464213bf8c8SGerald Van Baren * CONFIG_OF_FLAT_TREE - The resulting flat device tree 465213bf8c8SGerald Van Baren will have a copy of the bd_t. Space should be 466213bf8c8SGerald Van Baren pre-allocated in the dts for the bd_t. 467e4f880edSKumar Gala 468e4f880edSKumar Gala CONFIG_OF_HAS_UBOOT_ENV 469e4f880edSKumar Gala 470213bf8c8SGerald Van Baren * CONFIG_OF_LIBFDT - enables the "fdt bd_t" command 471213bf8c8SGerald Van Baren * CONFIG_OF_FLAT_TREE - The resulting flat device tree 472213bf8c8SGerald Van Baren will have a copy of u-boot's environment variables 473e4f880edSKumar Gala 4744e253137SKumar Gala CONFIG_OF_BOARD_SETUP 4754e253137SKumar Gala 4764e253137SKumar Gala Board code has addition modification that it wants to make 4774e253137SKumar Gala to the flat device tree before handing it off to the kernel 4786705d81eSwdenk 4790267768eSMatthew McClintock CONFIG_OF_BOOT_CPU 4800267768eSMatthew McClintock 4810267768eSMatthew McClintock This define fills in the correct boot cpu in the boot 4820267768eSMatthew McClintock param header, the default value is zero if undefined. 4830267768eSMatthew McClintock 4846705d81eSwdenk- Serial Ports: 4856705d81eSwdenk CFG_PL010_SERIAL 4866705d81eSwdenk 4876705d81eSwdenk Define this if you want support for Amba PrimeCell PL010 UARTs. 4886705d81eSwdenk 4896705d81eSwdenk CFG_PL011_SERIAL 4906705d81eSwdenk 4916705d81eSwdenk Define this if you want support for Amba PrimeCell PL011 UARTs. 4926705d81eSwdenk 4936705d81eSwdenk CONFIG_PL011_CLOCK 4946705d81eSwdenk 4956705d81eSwdenk If you have Amba PrimeCell PL011 UARTs, set this variable to 4966705d81eSwdenk the clock speed of the UARTs. 4976705d81eSwdenk 4986705d81eSwdenk CONFIG_PL01x_PORTS 4996705d81eSwdenk 5006705d81eSwdenk If you have Amba PrimeCell PL010 or PL011 UARTs on your board, 5016705d81eSwdenk define this to a list of base addresses for each (supported) 5026705d81eSwdenk port. See e.g. include/configs/versatile.h 5036705d81eSwdenk 5046705d81eSwdenk 505c609719bSwdenk- Console Interface: 506c609719bSwdenk Depending on board, define exactly one serial port 507c609719bSwdenk (like CONFIG_8xx_CONS_SMC1, CONFIG_8xx_CONS_SMC2, 508c609719bSwdenk CONFIG_8xx_CONS_SCC1, ...), or switch off the serial 509c609719bSwdenk console by defining CONFIG_8xx_CONS_NONE 510c609719bSwdenk 511c609719bSwdenk Note: if CONFIG_8xx_CONS_NONE is defined, the serial 512c609719bSwdenk port routines must be defined elsewhere 513c609719bSwdenk (i.e. serial_init(), serial_getc(), ...) 514c609719bSwdenk 515c609719bSwdenk CONFIG_CFB_CONSOLE 516c609719bSwdenk Enables console device for a color framebuffer. Needs following 517c609719bSwdenk defines (cf. smiLynxEM, i8042, board/eltec/bab7xx) 518c609719bSwdenk VIDEO_FB_LITTLE_ENDIAN graphic memory organisation 519c609719bSwdenk (default big endian) 520c609719bSwdenk VIDEO_HW_RECTFILL graphic chip supports 521c609719bSwdenk rectangle fill 522c609719bSwdenk (cf. smiLynxEM) 523c609719bSwdenk VIDEO_HW_BITBLT graphic chip supports 524c609719bSwdenk bit-blit (cf. smiLynxEM) 525c609719bSwdenk VIDEO_VISIBLE_COLS visible pixel columns 526c609719bSwdenk (cols=pitch) 527c609719bSwdenk VIDEO_VISIBLE_ROWS visible pixel rows 528c609719bSwdenk VIDEO_PIXEL_SIZE bytes per pixel 529c609719bSwdenk VIDEO_DATA_FORMAT graphic data format 530c609719bSwdenk (0-5, cf. cfb_console.c) 531c609719bSwdenk VIDEO_FB_ADRS framebuffer address 532c609719bSwdenk VIDEO_KBD_INIT_FCT keyboard int fct 533c609719bSwdenk (i.e. i8042_kbd_init()) 534c609719bSwdenk VIDEO_TSTC_FCT test char fct 535c609719bSwdenk (i.e. i8042_tstc) 536c609719bSwdenk VIDEO_GETC_FCT get char fct 537c609719bSwdenk (i.e. i8042_getc) 538c609719bSwdenk CONFIG_CONSOLE_CURSOR cursor drawing on/off 539c609719bSwdenk (requires blink timer 540c609719bSwdenk cf. i8042.c) 541c609719bSwdenk CFG_CONSOLE_BLINK_COUNT blink interval (cf. i8042.c) 542c609719bSwdenk CONFIG_CONSOLE_TIME display time/date info in 543c609719bSwdenk upper right corner 544602ad3b3SJon Loeliger (requires CONFIG_CMD_DATE) 545c609719bSwdenk CONFIG_VIDEO_LOGO display Linux logo in 546c609719bSwdenk upper left corner 547a6c7ad2fSwdenk CONFIG_VIDEO_BMP_LOGO use bmp_logo.h instead of 548a6c7ad2fSwdenk linux_logo.h for logo. 549a6c7ad2fSwdenk Requires CONFIG_VIDEO_LOGO 550c609719bSwdenk CONFIG_CONSOLE_EXTRA_INFO 551c609719bSwdenk addional board info beside 552c609719bSwdenk the logo 553c609719bSwdenk 554c609719bSwdenk When CONFIG_CFB_CONSOLE is defined, video console is 555c609719bSwdenk default i/o. Serial console can be forced with 556c609719bSwdenk environment 'console=serial'. 557c609719bSwdenk 558a3ad8e26Swdenk When CONFIG_SILENT_CONSOLE is defined, all console 559a3ad8e26Swdenk messages (by U-Boot and Linux!) can be silenced with 560a3ad8e26Swdenk the "silent" environment variable. See 561a3ad8e26Swdenk doc/README.silent for more information. 562a3ad8e26Swdenk 563c609719bSwdenk- Console Baudrate: 564c609719bSwdenk CONFIG_BAUDRATE - in bps 565c609719bSwdenk Select one of the baudrates listed in 566c609719bSwdenk CFG_BAUDRATE_TABLE, see below. 5673bbc899fSwdenk CFG_BRGCLK_PRESCALE, baudrate prescale 568c609719bSwdenk 569c609719bSwdenk- Interrupt driven serial port input: 570c609719bSwdenk CONFIG_SERIAL_SOFTWARE_FIFO 571c609719bSwdenk 572c609719bSwdenk PPC405GP only. 573c609719bSwdenk Use an interrupt handler for receiving data on the 574c609719bSwdenk serial port. It also enables using hardware handshake 575c609719bSwdenk (RTS/CTS) and UART's built-in FIFO. Set the number of 576c609719bSwdenk bytes the interrupt driven input buffer should have. 577c609719bSwdenk 578109c0e3aSwdenk Leave undefined to disable this feature, including 579109c0e3aSwdenk disable the buffer and hardware handshake. 580c609719bSwdenk 5811d49b1f3Sstroese- Console UART Number: 5821d49b1f3Sstroese CONFIG_UART1_CONSOLE 5831d49b1f3Sstroese 5840c8721a4SWolfgang Denk AMCC PPC4xx only. 5851d49b1f3Sstroese If defined internal UART1 (and not UART0) is used 5861d49b1f3Sstroese as default U-Boot console. 5871d49b1f3Sstroese 588c609719bSwdenk- Boot Delay: CONFIG_BOOTDELAY - in seconds 589c609719bSwdenk Delay before automatically booting the default image; 590c609719bSwdenk set to -1 to disable autoboot. 591c609719bSwdenk 592c609719bSwdenk See doc/README.autoboot for these options that 593c609719bSwdenk work with CONFIG_BOOTDELAY. None are required. 594c609719bSwdenk CONFIG_BOOT_RETRY_TIME 595c609719bSwdenk CONFIG_BOOT_RETRY_MIN 596c609719bSwdenk CONFIG_AUTOBOOT_KEYED 597c609719bSwdenk CONFIG_AUTOBOOT_PROMPT 598c609719bSwdenk CONFIG_AUTOBOOT_DELAY_STR 599c609719bSwdenk CONFIG_AUTOBOOT_STOP_STR 600c609719bSwdenk CONFIG_AUTOBOOT_DELAY_STR2 601c609719bSwdenk CONFIG_AUTOBOOT_STOP_STR2 602c609719bSwdenk CONFIG_ZERO_BOOTDELAY_CHECK 603c609719bSwdenk CONFIG_RESET_TO_RETRY 604c609719bSwdenk 605c609719bSwdenk- Autoboot Command: 606c609719bSwdenk CONFIG_BOOTCOMMAND 607c609719bSwdenk Only needed when CONFIG_BOOTDELAY is enabled; 608c609719bSwdenk define a command string that is automatically executed 609c609719bSwdenk when no character is read on the console interface 610c609719bSwdenk within "Boot Delay" after reset. 611c609719bSwdenk 612c609719bSwdenk CONFIG_BOOTARGS 613c609719bSwdenk This can be used to pass arguments to the bootm 614c609719bSwdenk command. The value of CONFIG_BOOTARGS goes into the 615c609719bSwdenk environment value "bootargs". 616c609719bSwdenk 617c609719bSwdenk CONFIG_RAMBOOT and CONFIG_NFSBOOT 618c609719bSwdenk The value of these goes into the environment as 619c609719bSwdenk "ramboot" and "nfsboot" respectively, and can be used 620c609719bSwdenk as a convenience, when switching between booting from 621c609719bSwdenk ram and nfs. 622c609719bSwdenk 623c609719bSwdenk- Pre-Boot Commands: 624c609719bSwdenk CONFIG_PREBOOT 625c609719bSwdenk 626c609719bSwdenk When this option is #defined, the existence of the 627c609719bSwdenk environment variable "preboot" will be checked 628c609719bSwdenk immediately before starting the CONFIG_BOOTDELAY 629c609719bSwdenk countdown and/or running the auto-boot command resp. 630c609719bSwdenk entering interactive mode. 631c609719bSwdenk 632c609719bSwdenk This feature is especially useful when "preboot" is 633c609719bSwdenk automatically generated or modified. For an example 634c609719bSwdenk see the LWMON board specific code: here "preboot" is 635c609719bSwdenk modified when the user holds down a certain 636c609719bSwdenk combination of keys on the (special) keyboard when 637c609719bSwdenk booting the systems 638c609719bSwdenk 639c609719bSwdenk- Serial Download Echo Mode: 640c609719bSwdenk CONFIG_LOADS_ECHO 641c609719bSwdenk If defined to 1, all characters received during a 642c609719bSwdenk serial download (using the "loads" command) are 643c609719bSwdenk echoed back. This might be needed by some terminal 644c609719bSwdenk emulations (like "cu"), but may as well just take 645c609719bSwdenk time on others. This setting #define's the initial 646c609719bSwdenk value of the "loads_echo" environment variable. 647c609719bSwdenk 648602ad3b3SJon Loeliger- Kgdb Serial Baudrate: (if CONFIG_CMD_KGDB is defined) 649c609719bSwdenk CONFIG_KGDB_BAUDRATE 650c609719bSwdenk Select one of the baudrates listed in 651c609719bSwdenk CFG_BAUDRATE_TABLE, see below. 652c609719bSwdenk 653c609719bSwdenk- Monitor Functions: 654602ad3b3SJon Loeliger Monitor commands can be included or excluded 655602ad3b3SJon Loeliger from the build by using the #include files 656602ad3b3SJon Loeliger "config_cmd_all.h" and #undef'ing unwanted 657602ad3b3SJon Loeliger commands, or using "config_cmd_default.h" 658602ad3b3SJon Loeliger and augmenting with additional #define's 659602ad3b3SJon Loeliger for wanted commands. 660c609719bSwdenk 661602ad3b3SJon Loeliger The default command configuration includes all commands 662602ad3b3SJon Loeliger except those marked below with a "*". 663602ad3b3SJon Loeliger 664602ad3b3SJon Loeliger CONFIG_CMD_ASKENV * ask for env variable 665602ad3b3SJon Loeliger CONFIG_CMD_AUTOSCRIPT Autoscript Support 666602ad3b3SJon Loeliger CONFIG_CMD_BDI bdinfo 667602ad3b3SJon Loeliger CONFIG_CMD_BEDBUG * Include BedBug Debugger 668602ad3b3SJon Loeliger CONFIG_CMD_BMP * BMP support 669602ad3b3SJon Loeliger CONFIG_CMD_BSP * Board specific commands 670602ad3b3SJon Loeliger CONFIG_CMD_BOOTD bootd 671602ad3b3SJon Loeliger CONFIG_CMD_CACHE * icache, dcache 672602ad3b3SJon Loeliger CONFIG_CMD_CONSOLE coninfo 673602ad3b3SJon Loeliger CONFIG_CMD_DATE * support for RTC, date/time... 674602ad3b3SJon Loeliger CONFIG_CMD_DHCP * DHCP support 675602ad3b3SJon Loeliger CONFIG_CMD_DIAG * Diagnostics 676602ad3b3SJon Loeliger CONFIG_CMD_DOC * Disk-On-Chip Support 677602ad3b3SJon Loeliger CONFIG_CMD_DTT * Digital Therm and Thermostat 678602ad3b3SJon Loeliger CONFIG_CMD_ECHO echo arguments 679602ad3b3SJon Loeliger CONFIG_CMD_EEPROM * EEPROM read/write support 680602ad3b3SJon Loeliger CONFIG_CMD_ELF * bootelf, bootvx 681602ad3b3SJon Loeliger CONFIG_CMD_ENV saveenv 682602ad3b3SJon Loeliger CONFIG_CMD_FDC * Floppy Disk Support 683602ad3b3SJon Loeliger CONFIG_CMD_FAT * FAT partition support 684602ad3b3SJon Loeliger CONFIG_CMD_FDOS * Dos diskette Support 685602ad3b3SJon Loeliger CONFIG_CMD_FLASH flinfo, erase, protect 686602ad3b3SJon Loeliger CONFIG_CMD_FPGA FPGA device initialization support 687602ad3b3SJon Loeliger CONFIG_CMD_HWFLOW * RTS/CTS hw flow control 688602ad3b3SJon Loeliger CONFIG_CMD_I2C * I2C serial bus support 689602ad3b3SJon Loeliger CONFIG_CMD_IDE * IDE harddisk support 690602ad3b3SJon Loeliger CONFIG_CMD_IMI iminfo 691602ad3b3SJon Loeliger CONFIG_CMD_IMLS List all found images 692602ad3b3SJon Loeliger CONFIG_CMD_IMMAP * IMMR dump support 693602ad3b3SJon Loeliger CONFIG_CMD_IRQ * irqinfo 694602ad3b3SJon Loeliger CONFIG_CMD_ITEST Integer/string test of 2 values 695602ad3b3SJon Loeliger CONFIG_CMD_JFFS2 * JFFS2 Support 696602ad3b3SJon Loeliger CONFIG_CMD_KGDB * kgdb 697602ad3b3SJon Loeliger CONFIG_CMD_LOADB loadb 698602ad3b3SJon Loeliger CONFIG_CMD_LOADS loads 699602ad3b3SJon Loeliger CONFIG_CMD_MEMORY md, mm, nm, mw, cp, cmp, crc, base, 70056523f12Swdenk loop, loopw, mtest 701602ad3b3SJon Loeliger CONFIG_CMD_MISC Misc functions like sleep etc 702602ad3b3SJon Loeliger CONFIG_CMD_MMC * MMC memory mapped support 703602ad3b3SJon Loeliger CONFIG_CMD_MII * MII utility commands 704602ad3b3SJon Loeliger CONFIG_CMD_NAND * NAND support 705602ad3b3SJon Loeliger CONFIG_CMD_NET bootp, tftpboot, rarpboot 706602ad3b3SJon Loeliger CONFIG_CMD_PCI * pciinfo 707602ad3b3SJon Loeliger CONFIG_CMD_PCMCIA * PCMCIA support 708602ad3b3SJon Loeliger CONFIG_CMD_PING * send ICMP ECHO_REQUEST to network 709602ad3b3SJon Loeliger host 710602ad3b3SJon Loeliger CONFIG_CMD_PORTIO * Port I/O 711602ad3b3SJon Loeliger CONFIG_CMD_REGINFO * Register dump 712602ad3b3SJon Loeliger CONFIG_CMD_RUN run command in env variable 713602ad3b3SJon Loeliger CONFIG_CMD_SAVES * save S record dump 714602ad3b3SJon Loeliger CONFIG_CMD_SCSI * SCSI Support 715602ad3b3SJon Loeliger CONFIG_CMD_SDRAM * print SDRAM configuration information 716602ad3b3SJon Loeliger (requires CONFIG_CMD_I2C) 717602ad3b3SJon Loeliger CONFIG_CMD_SETGETDCR Support for DCR Register access 718602ad3b3SJon Loeliger (4xx only) 719602ad3b3SJon Loeliger CONFIG_CMD_SPI * SPI serial bus support 720602ad3b3SJon Loeliger CONFIG_CMD_USB * USB support 721602ad3b3SJon Loeliger CONFIG_CMD_VFD * VFD support (TRAB) 722602ad3b3SJon Loeliger CONFIG_CMD_BSP * Board SPecific functions 723602ad3b3SJon Loeliger CONFIG_CMD_CDP * Cisco Discover Protocol support 724602ad3b3SJon Loeliger CONFIG_CMD_FSL * Microblaze FSL support 725c609719bSwdenk 726c609719bSwdenk 727c609719bSwdenk EXAMPLE: If you want all functions except of network 728c609719bSwdenk support you can write: 729c609719bSwdenk 730602ad3b3SJon Loeliger #include "config_cmd_all.h" 731602ad3b3SJon Loeliger #undef CONFIG_CMD_NET 732c609719bSwdenk 733213bf8c8SGerald Van Baren Other Commands: 734213bf8c8SGerald Van Baren fdt (flattened device tree) command: CONFIG_OF_LIBFDT 735c609719bSwdenk 736c609719bSwdenk Note: Don't enable the "icache" and "dcache" commands 737602ad3b3SJon Loeliger (configuration option CONFIG_CMD_CACHE) unless you know 738c609719bSwdenk what you (and your U-Boot users) are doing. Data 739c609719bSwdenk cache cannot be enabled on systems like the 8xx or 740c609719bSwdenk 8260 (where accesses to the IMMR region must be 741c609719bSwdenk uncached), and it cannot be disabled on all other 742c609719bSwdenk systems where we (mis-) use the data cache to hold an 743c609719bSwdenk initial stack and some data. 744c609719bSwdenk 745c609719bSwdenk 746c609719bSwdenk XXX - this list needs to get updated! 747c609719bSwdenk 748c609719bSwdenk- Watchdog: 749c609719bSwdenk CONFIG_WATCHDOG 750c609719bSwdenk If this variable is defined, it enables watchdog 7517152b1d0Swdenk support. There must be support in the platform specific 752c609719bSwdenk code for a watchdog. For the 8xx and 8260 CPUs, the 753c609719bSwdenk SIU Watchdog feature is enabled in the SYPCR 754c609719bSwdenk register. 755c609719bSwdenk 756c1551ea8Sstroese- U-Boot Version: 757c1551ea8Sstroese CONFIG_VERSION_VARIABLE 758c1551ea8Sstroese If this variable is defined, an environment variable 759c1551ea8Sstroese named "ver" is created by U-Boot showing the U-Boot 760c1551ea8Sstroese version as printed by the "version" command. 761c1551ea8Sstroese This variable is readonly. 762c1551ea8Sstroese 763c609719bSwdenk- Real-Time Clock: 764c609719bSwdenk 765602ad3b3SJon Loeliger When CONFIG_CMD_DATE is selected, the type of the RTC 766c609719bSwdenk has to be selected, too. Define exactly one of the 767c609719bSwdenk following options: 768c609719bSwdenk 769c609719bSwdenk CONFIG_RTC_MPC8xx - use internal RTC of MPC8xx 770c609719bSwdenk CONFIG_RTC_PCF8563 - use Philips PCF8563 RTC 771c609719bSwdenk CONFIG_RTC_MC146818 - use MC146818 RTC 7721cb8e980Swdenk CONFIG_RTC_DS1307 - use Maxim, Inc. DS1307 RTC 773c609719bSwdenk CONFIG_RTC_DS1337 - use Maxim, Inc. DS1337 RTC 7747f70e853Swdenk CONFIG_RTC_DS1338 - use Maxim, Inc. DS1338 RTC 7753bac3513Swdenk CONFIG_RTC_DS164x - use Dallas DS164x RTC 7764c0d4c3bSwdenk CONFIG_RTC_MAX6900 - use Maxim, Inc. MAX6900 RTC 777c609719bSwdenk 778b37c7e5eSwdenk Note that if the RTC uses I2C, then the I2C interface 779b37c7e5eSwdenk must also be configured. See I2C Support, below. 780b37c7e5eSwdenk 781c609719bSwdenk- Timestamp Support: 782c609719bSwdenk 783c609719bSwdenk When CONFIG_TIMESTAMP is selected, the timestamp 784c609719bSwdenk (date and time) of an image is printed by image 785c609719bSwdenk commands like bootm or iminfo. This option is 786602ad3b3SJon Loeliger automatically enabled when you select CONFIG_CMD_DATE . 787c609719bSwdenk 788c609719bSwdenk- Partition Support: 789c609719bSwdenk CONFIG_MAC_PARTITION and/or CONFIG_DOS_PARTITION 790c609719bSwdenk and/or CONFIG_ISO_PARTITION 791c609719bSwdenk 792602ad3b3SJon Loeliger If IDE or SCSI support is enabled (CONFIG_CMD_IDE or 793602ad3b3SJon Loeliger CONFIG_CMD_SCSI) you must configure support for at least 794c609719bSwdenk one partition type as well. 795c609719bSwdenk 796c609719bSwdenk- IDE Reset method: 7974d13cbadSwdenk CONFIG_IDE_RESET_ROUTINE - this is defined in several 7984d13cbadSwdenk board configurations files but used nowhere! 799c609719bSwdenk 8004d13cbadSwdenk CONFIG_IDE_RESET - is this is defined, IDE Reset will 8014d13cbadSwdenk be performed by calling the function 8024d13cbadSwdenk ide_set_reset(int reset) 8034d13cbadSwdenk which has to be defined in a board specific file 804c609719bSwdenk 805c609719bSwdenk- ATAPI Support: 806c609719bSwdenk CONFIG_ATAPI 807c609719bSwdenk 808c609719bSwdenk Set this to enable ATAPI support. 809c609719bSwdenk 810c40b2956Swdenk- LBA48 Support 811c40b2956Swdenk CONFIG_LBA48 812c40b2956Swdenk 813c40b2956Swdenk Set this to enable support for disks larger than 137GB 814c40b2956Swdenk Also look at CFG_64BIT_LBA ,CFG_64BIT_VSPRINTF and CFG_64BIT_STRTOUL 815c40b2956Swdenk Whithout these , LBA48 support uses 32bit variables and will 'only' 816c40b2956Swdenk support disks up to 2.1TB. 817c40b2956Swdenk 818c40b2956Swdenk CFG_64BIT_LBA: 819c40b2956Swdenk When enabled, makes the IDE subsystem use 64bit sector addresses. 820c40b2956Swdenk Default is 32bit. 821c40b2956Swdenk 822c609719bSwdenk- SCSI Support: 823c609719bSwdenk At the moment only there is only support for the 824c609719bSwdenk SYM53C8XX SCSI controller; define 825c609719bSwdenk CONFIG_SCSI_SYM53C8XX to enable it. 826c609719bSwdenk 827c609719bSwdenk CFG_SCSI_MAX_LUN [8], CFG_SCSI_MAX_SCSI_ID [7] and 828c609719bSwdenk CFG_SCSI_MAX_DEVICE [CFG_SCSI_MAX_SCSI_ID * 829c609719bSwdenk CFG_SCSI_MAX_LUN] can be adjusted to define the 830c609719bSwdenk maximum numbers of LUNs, SCSI ID's and target 831c609719bSwdenk devices. 832c609719bSwdenk CFG_SCSI_SYM53C8XX_CCF to fix clock timing (80Mhz) 833c609719bSwdenk 834c609719bSwdenk- NETWORK Support (PCI): 835682011ffSwdenk CONFIG_E1000 836682011ffSwdenk Support for Intel 8254x gigabit chips. 837682011ffSwdenk 838c609719bSwdenk CONFIG_EEPRO100 839c609719bSwdenk Support for Intel 82557/82559/82559ER chips. 840c609719bSwdenk Optional CONFIG_EEPRO100_SROM_WRITE enables eeprom 841c609719bSwdenk write routine for first time initialisation. 842c609719bSwdenk 843c609719bSwdenk CONFIG_TULIP 844c609719bSwdenk Support for Digital 2114x chips. 845c609719bSwdenk Optional CONFIG_TULIP_SELECT_MEDIA for board specific 846c609719bSwdenk modem chip initialisation (KS8761/QS6611). 847c609719bSwdenk 848c609719bSwdenk CONFIG_NATSEMI 849c609719bSwdenk Support for National dp83815 chips. 850c609719bSwdenk 851c609719bSwdenk CONFIG_NS8382X 852c609719bSwdenk Support for National dp8382[01] gigabit chips. 853c609719bSwdenk 85445219c46Swdenk- NETWORK Support (other): 85545219c46Swdenk 85645219c46Swdenk CONFIG_DRIVER_LAN91C96 85745219c46Swdenk Support for SMSC's LAN91C96 chips. 85845219c46Swdenk 85945219c46Swdenk CONFIG_LAN91C96_BASE 86045219c46Swdenk Define this to hold the physical address 86145219c46Swdenk of the LAN91C96's I/O space 86245219c46Swdenk 86345219c46Swdenk CONFIG_LAN91C96_USE_32_BIT 86445219c46Swdenk Define this to enable 32 bit addressing 86545219c46Swdenk 866f39748aeSwdenk CONFIG_DRIVER_SMC91111 867f39748aeSwdenk Support for SMSC's LAN91C111 chip 868f39748aeSwdenk 869f39748aeSwdenk CONFIG_SMC91111_BASE 870f39748aeSwdenk Define this to hold the physical address 871f39748aeSwdenk of the device (I/O space) 872f39748aeSwdenk 873f39748aeSwdenk CONFIG_SMC_USE_32_BIT 874f39748aeSwdenk Define this if data bus is 32 bits 875f39748aeSwdenk 876f39748aeSwdenk CONFIG_SMC_USE_IOFUNCS 877f39748aeSwdenk Define this to use i/o functions instead of macros 878f39748aeSwdenk (some hardware wont work with macros) 879f39748aeSwdenk 880c609719bSwdenk- USB Support: 881c609719bSwdenk At the moment only the UHCI host controller is 8824d13cbadSwdenk supported (PIP405, MIP405, MPC5200); define 883c609719bSwdenk CONFIG_USB_UHCI to enable it. 884c609719bSwdenk define CONFIG_USB_KEYBOARD to enable the USB Keyboard 88530d56faeSwdenk and define CONFIG_USB_STORAGE to enable the USB 886c609719bSwdenk storage devices. 887c609719bSwdenk Note: 888c609719bSwdenk Supported are USB Keyboards and USB Floppy drives 889c609719bSwdenk (TEAC FD-05PUB). 8904d13cbadSwdenk MPC5200 USB requires additional defines: 8914d13cbadSwdenk CONFIG_USB_CLOCK 8924d13cbadSwdenk for 528 MHz Clock: 0x0001bbbb 8934d13cbadSwdenk CONFIG_USB_CONFIG 8944d13cbadSwdenk for differential drivers: 0x00001000 8954d13cbadSwdenk for single ended drivers: 0x00005000 8964d13cbadSwdenk 897c609719bSwdenk 89871f95118Swdenk- MMC Support: 89971f95118Swdenk The MMC controller on the Intel PXA is supported. To 90071f95118Swdenk enable this define CONFIG_MMC. The MMC can be 90171f95118Swdenk accessed from the boot prompt by mapping the device 90271f95118Swdenk to physical memory similar to flash. Command line is 903602ad3b3SJon Loeliger enabled with CONFIG_CMD_MMC. The MMC driver also works with 904602ad3b3SJon Loeliger the FAT fs. This is enabled with CONFIG_CMD_FAT. 90571f95118Swdenk 9066705d81eSwdenk- Journaling Flash filesystem support: 9076705d81eSwdenk CONFIG_JFFS2_NAND, CONFIG_JFFS2_NAND_OFF, CONFIG_JFFS2_NAND_SIZE, 9086705d81eSwdenk CONFIG_JFFS2_NAND_DEV 9096705d81eSwdenk Define these for a default partition on a NAND device 9106705d81eSwdenk 9116705d81eSwdenk CFG_JFFS2_FIRST_SECTOR, 9126705d81eSwdenk CFG_JFFS2_FIRST_BANK, CFG_JFFS2_NUM_BANKS 9136705d81eSwdenk Define these for a default partition on a NOR device 9146705d81eSwdenk 9156705d81eSwdenk CFG_JFFS_CUSTOM_PART 9166705d81eSwdenk Define this to create an own partition. You have to provide a 9176705d81eSwdenk function struct part_info* jffs2_part_info(int part_num) 9186705d81eSwdenk 9196705d81eSwdenk If you define only one JFFS2 partition you may also want to 9206705d81eSwdenk #define CFG_JFFS_SINGLE_PART 1 9216705d81eSwdenk to disable the command chpart. This is the default when you 9226705d81eSwdenk have not defined a custom partition 9236705d81eSwdenk 924c609719bSwdenk- Keyboard Support: 925c609719bSwdenk CONFIG_ISA_KEYBOARD 926c609719bSwdenk 927c609719bSwdenk Define this to enable standard (PC-Style) keyboard 928c609719bSwdenk support 929c609719bSwdenk 930c609719bSwdenk CONFIG_I8042_KBD 931c609719bSwdenk Standard PC keyboard driver with US (is default) and 932c609719bSwdenk GERMAN key layout (switch via environment 'keymap=de') support. 933c609719bSwdenk Export function i8042_kbd_init, i8042_tstc and i8042_getc 934c609719bSwdenk for cfb_console. Supports cursor blinking. 935c609719bSwdenk 936c609719bSwdenk- Video support: 937c609719bSwdenk CONFIG_VIDEO 938c609719bSwdenk 939c609719bSwdenk Define this to enable video support (for output to 940c609719bSwdenk video). 941c609719bSwdenk 942c609719bSwdenk CONFIG_VIDEO_CT69000 943c609719bSwdenk 944c609719bSwdenk Enable Chips & Technologies 69000 Video chip 945c609719bSwdenk 946c609719bSwdenk CONFIG_VIDEO_SMI_LYNXEM 947eeb1b77bSwdenk Enable Silicon Motion SMI 712/710/810 Video chip. The 948eeb1b77bSwdenk video output is selected via environment 'videoout' 949eeb1b77bSwdenk (1 = LCD and 2 = CRT). If videoout is undefined, CRT is 950eeb1b77bSwdenk assumed. 951c609719bSwdenk 952eeb1b77bSwdenk For the CT69000 and SMI_LYNXEM drivers, videomode is 953eeb1b77bSwdenk selected via environment 'videomode'. Two diferent ways 954eeb1b77bSwdenk are possible: 955eeb1b77bSwdenk - "videomode=num" 'num' is a standard LiLo mode numbers. 956eeb1b77bSwdenk Following standard modes are supported (* is default): 957eeb1b77bSwdenk 958eeb1b77bSwdenk Colors 640x480 800x600 1024x768 1152x864 1280x1024 959eeb1b77bSwdenk -------------+--------------------------------------------- 960eeb1b77bSwdenk 8 bits | 0x301* 0x303 0x305 0x161 0x307 961eeb1b77bSwdenk 15 bits | 0x310 0x313 0x316 0x162 0x319 962eeb1b77bSwdenk 16 bits | 0x311 0x314 0x317 0x163 0x31A 963eeb1b77bSwdenk 24 bits | 0x312 0x315 0x318 ? 0x31B 964eeb1b77bSwdenk -------------+--------------------------------------------- 965c609719bSwdenk (i.e. setenv videomode 317; saveenv; reset;) 966c609719bSwdenk 967eeb1b77bSwdenk - "videomode=bootargs" all the video parameters are parsed 968eeb1b77bSwdenk from the bootargs. (See drivers/videomodes.c) 969eeb1b77bSwdenk 970eeb1b77bSwdenk 971a6c7ad2fSwdenk CONFIG_VIDEO_SED13806 972a6c7ad2fSwdenk Enable Epson SED13806 driver. This driver supports 8bpp 973a6c7ad2fSwdenk and 16bpp modes defined by CONFIG_VIDEO_SED13806_8BPP 974a6c7ad2fSwdenk or CONFIG_VIDEO_SED13806_16BPP 975a6c7ad2fSwdenk 976682011ffSwdenk- Keyboard Support: 977682011ffSwdenk CONFIG_KEYBOARD 978682011ffSwdenk 979682011ffSwdenk Define this to enable a custom keyboard support. 980682011ffSwdenk This simply calls drv_keyboard_init() which must be 981682011ffSwdenk defined in your board-specific files. 982682011ffSwdenk The only board using this so far is RBC823. 983a6c7ad2fSwdenk 984c609719bSwdenk- LCD Support: CONFIG_LCD 985c609719bSwdenk 986c609719bSwdenk Define this to enable LCD support (for output to LCD 987c609719bSwdenk display); also select one of the supported displays 988c609719bSwdenk by defining one of these: 989c609719bSwdenk 990fd3103bbSwdenk CONFIG_NEC_NL6448AC33: 991c609719bSwdenk 992fd3103bbSwdenk NEC NL6448AC33-18. Active, color, single scan. 993c609719bSwdenk 994fd3103bbSwdenk CONFIG_NEC_NL6448BC20 995c609719bSwdenk 996fd3103bbSwdenk NEC NL6448BC20-08. 6.5", 640x480. 997fd3103bbSwdenk Active, color, single scan. 998fd3103bbSwdenk 999fd3103bbSwdenk CONFIG_NEC_NL6448BC33_54 1000fd3103bbSwdenk 1001fd3103bbSwdenk NEC NL6448BC33-54. 10.4", 640x480. 1002c609719bSwdenk Active, color, single scan. 1003c609719bSwdenk 1004c609719bSwdenk CONFIG_SHARP_16x9 1005c609719bSwdenk 1006c609719bSwdenk Sharp 320x240. Active, color, single scan. 1007c609719bSwdenk It isn't 16x9, and I am not sure what it is. 1008c609719bSwdenk 1009c609719bSwdenk CONFIG_SHARP_LQ64D341 1010c609719bSwdenk 1011c609719bSwdenk Sharp LQ64D341 display, 640x480. 1012c609719bSwdenk Active, color, single scan. 1013c609719bSwdenk 1014c609719bSwdenk CONFIG_HLD1045 1015c609719bSwdenk 1016c609719bSwdenk HLD1045 display, 640x480. 1017c609719bSwdenk Active, color, single scan. 1018c609719bSwdenk 1019c609719bSwdenk CONFIG_OPTREX_BW 1020c609719bSwdenk 1021c609719bSwdenk Optrex CBL50840-2 NF-FW 99 22 M5 1022c609719bSwdenk or 1023c609719bSwdenk Hitachi LMG6912RPFC-00T 1024c609719bSwdenk or 1025c609719bSwdenk Hitachi SP14Q002 1026c609719bSwdenk 1027c609719bSwdenk 320x240. Black & white. 1028c609719bSwdenk 1029c609719bSwdenk Normally display is black on white background; define 1030c609719bSwdenk CFG_WHITE_ON_BLACK to get it inverted. 1031c609719bSwdenk 10327152b1d0Swdenk- Splash Screen Support: CONFIG_SPLASH_SCREEN 1033d791b1dcSwdenk 1034d791b1dcSwdenk If this option is set, the environment is checked for 1035d791b1dcSwdenk a variable "splashimage". If found, the usual display 1036d791b1dcSwdenk of logo, copyright and system information on the LCD 1037e94d2cd9Swdenk is suppressed and the BMP image at the address 1038d791b1dcSwdenk specified in "splashimage" is loaded instead. The 1039d791b1dcSwdenk console is redirected to the "nulldev", too. This 1040d791b1dcSwdenk allows for a "silent" boot where a splash screen is 1041d791b1dcSwdenk loaded very quickly after power-on. 1042d791b1dcSwdenk 104398f4a3dfSStefan Roese- Gzip compressed BMP image support: CONFIG_VIDEO_BMP_GZIP 104498f4a3dfSStefan Roese 104598f4a3dfSStefan Roese If this option is set, additionally to standard BMP 104698f4a3dfSStefan Roese images, gzipped BMP images can be displayed via the 104798f4a3dfSStefan Roese splashscreen support or the bmp command. 104898f4a3dfSStefan Roese 1049c29fdfc1Swdenk- Compression support: 1050c29fdfc1Swdenk CONFIG_BZIP2 1051c29fdfc1Swdenk 1052c29fdfc1Swdenk If this option is set, support for bzip2 compressed 1053c29fdfc1Swdenk images is included. If not, only uncompressed and gzip 1054c29fdfc1Swdenk compressed images are supported. 1055c29fdfc1Swdenk 1056c29fdfc1Swdenk NOTE: the bzip2 algorithm requires a lot of RAM, so 1057c29fdfc1Swdenk the malloc area (as defined by CFG_MALLOC_LEN) should 1058c29fdfc1Swdenk be at least 4MB. 1059d791b1dcSwdenk 106017ea1177Swdenk- MII/PHY support: 106117ea1177Swdenk CONFIG_PHY_ADDR 106217ea1177Swdenk 106317ea1177Swdenk The address of PHY on MII bus. 106417ea1177Swdenk 106517ea1177Swdenk CONFIG_PHY_CLOCK_FREQ (ppc4xx) 106617ea1177Swdenk 106717ea1177Swdenk The clock frequency of the MII bus 106817ea1177Swdenk 106917ea1177Swdenk CONFIG_PHY_GIGE 107017ea1177Swdenk 107117ea1177Swdenk If this option is set, support for speed/duplex 107217ea1177Swdenk detection of Gigabit PHY is included. 107317ea1177Swdenk 107417ea1177Swdenk CONFIG_PHY_RESET_DELAY 107517ea1177Swdenk 107617ea1177Swdenk Some PHY like Intel LXT971A need extra delay after 107717ea1177Swdenk reset before any MII register access is possible. 107817ea1177Swdenk For such PHY, set this option to the usec delay 107917ea1177Swdenk required. (minimum 300usec for LXT971A) 108017ea1177Swdenk 108117ea1177Swdenk CONFIG_PHY_CMD_DELAY (ppc4xx) 108217ea1177Swdenk 108317ea1177Swdenk Some PHY like Intel LXT971A need extra delay after 108417ea1177Swdenk command issued before MII status register can be read 108517ea1177Swdenk 1086c609719bSwdenk- Ethernet address: 1087c609719bSwdenk CONFIG_ETHADDR 1088c609719bSwdenk CONFIG_ETH2ADDR 1089c609719bSwdenk CONFIG_ETH3ADDR 1090c609719bSwdenk 1091c609719bSwdenk Define a default value for ethernet address to use 1092c609719bSwdenk for the respective ethernet interface, in case this 1093c609719bSwdenk is not determined automatically. 1094c609719bSwdenk 1095c609719bSwdenk- IP address: 1096c609719bSwdenk CONFIG_IPADDR 1097c609719bSwdenk 1098c609719bSwdenk Define a default value for the IP address to use for 1099c609719bSwdenk the default ethernet interface, in case this is not 1100c609719bSwdenk determined through e.g. bootp. 1101c609719bSwdenk 1102c609719bSwdenk- Server IP address: 1103c609719bSwdenk CONFIG_SERVERIP 1104c609719bSwdenk 1105c609719bSwdenk Defines a default value for theIP address of a TFTP 1106c609719bSwdenk server to contact when using the "tftboot" command. 1107c609719bSwdenk 1108c609719bSwdenk- BOOTP Recovery Mode: 1109c609719bSwdenk CONFIG_BOOTP_RANDOM_DELAY 1110c609719bSwdenk 1111c609719bSwdenk If you have many targets in a network that try to 1112c609719bSwdenk boot using BOOTP, you may want to avoid that all 1113c609719bSwdenk systems send out BOOTP requests at precisely the same 1114c609719bSwdenk moment (which would happen for instance at recovery 1115c609719bSwdenk from a power failure, when all systems will try to 1116c609719bSwdenk boot, thus flooding the BOOTP server. Defining 1117c609719bSwdenk CONFIG_BOOTP_RANDOM_DELAY causes a random delay to be 1118c609719bSwdenk inserted before sending out BOOTP requests. The 1119c609719bSwdenk following delays are insterted then: 1120c609719bSwdenk 1121c609719bSwdenk 1st BOOTP request: delay 0 ... 1 sec 1122c609719bSwdenk 2nd BOOTP request: delay 0 ... 2 sec 1123c609719bSwdenk 3rd BOOTP request: delay 0 ... 4 sec 1124c609719bSwdenk 4th and following 1125c609719bSwdenk BOOTP requests: delay 0 ... 8 sec 1126c609719bSwdenk 1127fe389a82Sstroese- DHCP Advanced Options: 1128*1fe80d79SJon Loeliger You can fine tune the DHCP functionality by defining 1129*1fe80d79SJon Loeliger CONFIG_BOOTP_* symbols: 1130fe389a82Sstroese 1131*1fe80d79SJon Loeliger CONFIG_BOOTP_SUBNETMASK 1132*1fe80d79SJon Loeliger CONFIG_BOOTP_GATEWAY 1133*1fe80d79SJon Loeliger CONFIG_BOOTP_HOSTNAME 1134*1fe80d79SJon Loeliger CONFIG_BOOTP_NISDOMAIN 1135*1fe80d79SJon Loeliger CONFIG_BOOTP_BOOTPATH 1136*1fe80d79SJon Loeliger CONFIG_BOOTP_BOOTFILESIZE 1137*1fe80d79SJon Loeliger CONFIG_BOOTP_DNS 1138*1fe80d79SJon Loeliger CONFIG_BOOTP_DNS2 1139*1fe80d79SJon Loeliger CONFIG_BOOTP_SEND_HOSTNAME 1140*1fe80d79SJon Loeliger CONFIG_BOOTP_NTPSERVER 1141*1fe80d79SJon Loeliger CONFIG_BOOTP_TIMEOFFSET 1142*1fe80d79SJon Loeliger CONFIG_BOOTP_VENDOREX 1143fe389a82Sstroese 1144fe389a82Sstroese CONFIG_BOOTP_DNS2 - If a DHCP client requests the DNS 1145fe389a82Sstroese serverip from a DHCP server, it is possible that more 1146fe389a82Sstroese than one DNS serverip is offered to the client. 1147fe389a82Sstroese If CONFIG_BOOTP_DNS2 is enabled, the secondary DNS 1148fe389a82Sstroese serverip will be stored in the additional environment 1149fe389a82Sstroese variable "dnsip2". The first DNS serverip is always 1150fe389a82Sstroese stored in the variable "dnsip", when CONFIG_BOOTP_DNS 1151*1fe80d79SJon Loeliger is defined. 1152fe389a82Sstroese 1153fe389a82Sstroese CONFIG_BOOTP_SEND_HOSTNAME - Some DHCP servers are capable 1154fe389a82Sstroese to do a dynamic update of a DNS server. To do this, they 1155fe389a82Sstroese need the hostname of the DHCP requester. 1156*1fe80d79SJon Loeliger If CONFIG_BOOP_SEND_HOSTNAME is defined, the content 1157*1fe80d79SJon Loeliger of the "hostname" environment variable is passed as 1158*1fe80d79SJon Loeliger option 12 to the DHCP server. 1159fe389a82Sstroese 1160a3d991bdSwdenk - CDP Options: 1161a3d991bdSwdenk CONFIG_CDP_DEVICE_ID 1162a3d991bdSwdenk 1163a3d991bdSwdenk The device id used in CDP trigger frames. 1164a3d991bdSwdenk 1165a3d991bdSwdenk CONFIG_CDP_DEVICE_ID_PREFIX 1166a3d991bdSwdenk 1167a3d991bdSwdenk A two character string which is prefixed to the MAC address 1168a3d991bdSwdenk of the device. 1169a3d991bdSwdenk 1170a3d991bdSwdenk CONFIG_CDP_PORT_ID 1171a3d991bdSwdenk 1172a3d991bdSwdenk A printf format string which contains the ascii name of 1173a3d991bdSwdenk the port. Normally is set to "eth%d" which sets 1174a3d991bdSwdenk eth0 for the first ethernet, eth1 for the second etc. 1175a3d991bdSwdenk 1176a3d991bdSwdenk CONFIG_CDP_CAPABILITIES 1177a3d991bdSwdenk 1178a3d991bdSwdenk A 32bit integer which indicates the device capabilities; 1179a3d991bdSwdenk 0x00000010 for a normal host which does not forwards. 1180a3d991bdSwdenk 1181a3d991bdSwdenk CONFIG_CDP_VERSION 1182a3d991bdSwdenk 1183a3d991bdSwdenk An ascii string containing the version of the software. 1184a3d991bdSwdenk 1185a3d991bdSwdenk CONFIG_CDP_PLATFORM 1186a3d991bdSwdenk 1187a3d991bdSwdenk An ascii string containing the name of the platform. 1188a3d991bdSwdenk 1189a3d991bdSwdenk CONFIG_CDP_TRIGGER 1190a3d991bdSwdenk 1191a3d991bdSwdenk A 32bit integer sent on the trigger. 1192a3d991bdSwdenk 1193a3d991bdSwdenk CONFIG_CDP_POWER_CONSUMPTION 1194a3d991bdSwdenk 1195a3d991bdSwdenk A 16bit integer containing the power consumption of the 1196a3d991bdSwdenk device in .1 of milliwatts. 1197a3d991bdSwdenk 1198a3d991bdSwdenk CONFIG_CDP_APPLIANCE_VLAN_TYPE 1199a3d991bdSwdenk 1200a3d991bdSwdenk A byte containing the id of the VLAN. 1201a3d991bdSwdenk 1202c609719bSwdenk- Status LED: CONFIG_STATUS_LED 1203c609719bSwdenk 1204c609719bSwdenk Several configurations allow to display the current 1205c609719bSwdenk status using a LED. For instance, the LED will blink 1206c609719bSwdenk fast while running U-Boot code, stop blinking as 1207c609719bSwdenk soon as a reply to a BOOTP request was received, and 1208c609719bSwdenk start blinking slow once the Linux kernel is running 1209c609719bSwdenk (supported by a status LED driver in the Linux 1210c609719bSwdenk kernel). Defining CONFIG_STATUS_LED enables this 1211c609719bSwdenk feature in U-Boot. 1212c609719bSwdenk 1213c609719bSwdenk- CAN Support: CONFIG_CAN_DRIVER 1214c609719bSwdenk 1215c609719bSwdenk Defining CONFIG_CAN_DRIVER enables CAN driver support 1216c609719bSwdenk on those systems that support this (optional) 1217c609719bSwdenk feature, like the TQM8xxL modules. 1218c609719bSwdenk 1219c609719bSwdenk- I2C Support: CONFIG_HARD_I2C | CONFIG_SOFT_I2C 1220c609719bSwdenk 1221b37c7e5eSwdenk These enable I2C serial bus commands. Defining either of 1222b37c7e5eSwdenk (but not both of) CONFIG_HARD_I2C or CONFIG_SOFT_I2C will 1223b37c7e5eSwdenk include the appropriate I2C driver for the selected cpu. 1224c609719bSwdenk 1225b37c7e5eSwdenk This will allow you to use i2c commands at the u-boot 1226602ad3b3SJon Loeliger command line (as long as you set CONFIG_CMD_I2C in 1227b37c7e5eSwdenk CONFIG_COMMANDS) and communicate with i2c based realtime 1228b37c7e5eSwdenk clock chips. See common/cmd_i2c.c for a description of the 1229c609719bSwdenk command line interface. 1230c609719bSwdenk 1231bb99ad6dSBen Warren CONFIG_I2C_CMD_TREE is a recommended option that places 1232bb99ad6dSBen Warren all I2C commands under a single 'i2c' root command. The 1233bb99ad6dSBen Warren older 'imm', 'imd', 'iprobe' etc. commands are considered 1234bb99ad6dSBen Warren deprecated and may disappear in the future. 1235bb99ad6dSBen Warren 1236bb99ad6dSBen Warren CONFIG_HARD_I2C selects a hardware I2C controller. 1237c609719bSwdenk 1238b37c7e5eSwdenk CONFIG_SOFT_I2C configures u-boot to use a software (aka 1239b37c7e5eSwdenk bit-banging) driver instead of CPM or similar hardware 1240b37c7e5eSwdenk support for I2C. 1241c609719bSwdenk 1242b37c7e5eSwdenk There are several other quantities that must also be 1243b37c7e5eSwdenk defined when you define CONFIG_HARD_I2C or CONFIG_SOFT_I2C. 1244c609719bSwdenk 1245b37c7e5eSwdenk In both cases you will need to define CFG_I2C_SPEED 1246b37c7e5eSwdenk to be the frequency (in Hz) at which you wish your i2c bus 1247b37c7e5eSwdenk to run and CFG_I2C_SLAVE to be the address of this node (ie 1248b37c7e5eSwdenk the cpu's i2c node address). 1249c609719bSwdenk 1250b37c7e5eSwdenk Now, the u-boot i2c code for the mpc8xx (cpu/mpc8xx/i2c.c) 1251b37c7e5eSwdenk sets the cpu up as a master node and so its address should 1252b37c7e5eSwdenk therefore be cleared to 0 (See, eg, MPC823e User's Manual 1253b37c7e5eSwdenk p.16-473). So, set CFG_I2C_SLAVE to 0. 1254b37c7e5eSwdenk 1255b37c7e5eSwdenk That's all that's required for CONFIG_HARD_I2C. 1256b37c7e5eSwdenk 1257b37c7e5eSwdenk If you use the software i2c interface (CONFIG_SOFT_I2C) 1258b37c7e5eSwdenk then the following macros need to be defined (examples are 1259b37c7e5eSwdenk from include/configs/lwmon.h): 1260c609719bSwdenk 1261c609719bSwdenk I2C_INIT 1262c609719bSwdenk 1263b37c7e5eSwdenk (Optional). Any commands necessary to enable the I2C 1264c609719bSwdenk controller or configure ports. 1265c609719bSwdenk 1266b37c7e5eSwdenk eg: #define I2C_INIT (immr->im_cpm.cp_pbdir |= PB_SCL) 1267b37c7e5eSwdenk 1268c609719bSwdenk I2C_PORT 1269c609719bSwdenk 1270c609719bSwdenk (Only for MPC8260 CPU). The I/O port to use (the code 1271c609719bSwdenk assumes both bits are on the same port). Valid values 1272c609719bSwdenk are 0..3 for ports A..D. 1273c609719bSwdenk 1274c609719bSwdenk I2C_ACTIVE 1275c609719bSwdenk 1276c609719bSwdenk The code necessary to make the I2C data line active 1277c609719bSwdenk (driven). If the data line is open collector, this 1278c609719bSwdenk define can be null. 1279c609719bSwdenk 1280b37c7e5eSwdenk eg: #define I2C_ACTIVE (immr->im_cpm.cp_pbdir |= PB_SDA) 1281b37c7e5eSwdenk 1282c609719bSwdenk I2C_TRISTATE 1283c609719bSwdenk 1284c609719bSwdenk The code necessary to make the I2C data line tri-stated 1285c609719bSwdenk (inactive). If the data line is open collector, this 1286c609719bSwdenk define can be null. 1287c609719bSwdenk 1288b37c7e5eSwdenk eg: #define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA) 1289b37c7e5eSwdenk 1290c609719bSwdenk I2C_READ 1291c609719bSwdenk 1292c609719bSwdenk Code that returns TRUE if the I2C data line is high, 1293c609719bSwdenk FALSE if it is low. 1294c609719bSwdenk 1295b37c7e5eSwdenk eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0) 1296b37c7e5eSwdenk 1297c609719bSwdenk I2C_SDA(bit) 1298c609719bSwdenk 1299c609719bSwdenk If <bit> is TRUE, sets the I2C data line high. If it 1300c609719bSwdenk is FALSE, it clears it (low). 1301c609719bSwdenk 1302b37c7e5eSwdenk eg: #define I2C_SDA(bit) \ 1303b37c7e5eSwdenk if(bit) immr->im_cpm.cp_pbdat |= PB_SDA; \ 1304b37c7e5eSwdenk else immr->im_cpm.cp_pbdat &= ~PB_SDA 1305b37c7e5eSwdenk 1306c609719bSwdenk I2C_SCL(bit) 1307c609719bSwdenk 1308c609719bSwdenk If <bit> is TRUE, sets the I2C clock line high. If it 1309c609719bSwdenk is FALSE, it clears it (low). 1310c609719bSwdenk 1311b37c7e5eSwdenk eg: #define I2C_SCL(bit) \ 1312b37c7e5eSwdenk if(bit) immr->im_cpm.cp_pbdat |= PB_SCL; \ 1313b37c7e5eSwdenk else immr->im_cpm.cp_pbdat &= ~PB_SCL 1314b37c7e5eSwdenk 1315c609719bSwdenk I2C_DELAY 1316c609719bSwdenk 1317c609719bSwdenk This delay is invoked four times per clock cycle so this 1318c609719bSwdenk controls the rate of data transfer. The data rate thus 1319b37c7e5eSwdenk is 1 / (I2C_DELAY * 4). Often defined to be something 1320b37c7e5eSwdenk like: 1321b37c7e5eSwdenk 1322b37c7e5eSwdenk #define I2C_DELAY udelay(2) 1323c609719bSwdenk 132447cd00faSwdenk CFG_I2C_INIT_BOARD 132547cd00faSwdenk 132647cd00faSwdenk When a board is reset during an i2c bus transfer 132747cd00faSwdenk chips might think that the current transfer is still 132847cd00faSwdenk in progress. On some boards it is possible to access 132947cd00faSwdenk the i2c SCLK line directly, either by using the 133047cd00faSwdenk processor pin as a GPIO or by having a second pin 133147cd00faSwdenk connected to the bus. If this option is defined a 133247cd00faSwdenk custom i2c_init_board() routine in boards/xxx/board.c 133347cd00faSwdenk is run early in the boot sequence. 133447cd00faSwdenk 133517ea1177Swdenk CONFIG_I2CFAST (PPC405GP|PPC405EP only) 133617ea1177Swdenk 133717ea1177Swdenk This option enables configuration of bi_iic_fast[] flags 133817ea1177Swdenk in u-boot bd_info structure based on u-boot environment 133917ea1177Swdenk variable "i2cfast". (see also i2cfast) 134017ea1177Swdenk 1341bb99ad6dSBen Warren CONFIG_I2C_MULTI_BUS 1342bb99ad6dSBen Warren 1343bb99ad6dSBen Warren This option allows the use of multiple I2C buses, each of which 1344bb99ad6dSBen Warren must have a controller. At any point in time, only one bus is 1345bb99ad6dSBen Warren active. To switch to a different bus, use the 'i2c dev' command. 1346bb99ad6dSBen Warren Note that bus numbering is zero-based. 1347bb99ad6dSBen Warren 1348bb99ad6dSBen Warren CFG_I2C_NOPROBES 1349bb99ad6dSBen Warren 1350bb99ad6dSBen Warren This option specifies a list of I2C devices that will be skipped 1351bb99ad6dSBen Warren when the 'i2c probe' command is issued (or 'iprobe' using the legacy 1352bb99ad6dSBen Warren command). If CONFIG_I2C_MULTI_BUS is set, specify a list of bus-device 1353bb99ad6dSBen Warren pairs. Otherwise, specify a 1D array of device addresses 1354bb99ad6dSBen Warren 1355bb99ad6dSBen Warren e.g. 1356bb99ad6dSBen Warren #undef CONFIG_I2C_MULTI_BUS 1357bb99ad6dSBen Warren #define CFG_I2C_NOPROBES {0x50,0x68} 1358bb99ad6dSBen Warren 1359bb99ad6dSBen Warren will skip addresses 0x50 and 0x68 on a board with one I2C bus 1360bb99ad6dSBen Warren 1361bb99ad6dSBen Warren #define CONFIG_I2C_MULTI_BUS 1362bb99ad6dSBen Warren #define CFG_I2C_MULTI_NOPROBES {{0,0x50},{0,0x68},{1,0x54}} 1363bb99ad6dSBen Warren 1364bb99ad6dSBen Warren will skip addresses 0x50 and 0x68 on bus 0 and address 0x54 on bus 1 1365bb99ad6dSBen Warren 1366be5e6181STimur Tabi CFG_SPD_BUS_NUM 1367be5e6181STimur Tabi 1368be5e6181STimur Tabi If defined, then this indicates the I2C bus number for DDR SPD. 1369be5e6181STimur Tabi If not defined, then U-Boot assumes that SPD is on I2C bus 0. 1370be5e6181STimur Tabi 13710dc018ecSStefan Roese CFG_RTC_BUS_NUM 13720dc018ecSStefan Roese 13730dc018ecSStefan Roese If defined, then this indicates the I2C bus number for the RTC. 13740dc018ecSStefan Roese If not defined, then U-Boot assumes that RTC is on I2C bus 0. 13750dc018ecSStefan Roese 13760dc018ecSStefan Roese CFG_DTT_BUS_NUM 13770dc018ecSStefan Roese 13780dc018ecSStefan Roese If defined, then this indicates the I2C bus number for the DTT. 13790dc018ecSStefan Roese If not defined, then U-Boot assumes that DTT is on I2C bus 0. 13800dc018ecSStefan Roese 1381be5e6181STimur Tabi CONFIG_FSL_I2C 1382be5e6181STimur Tabi 1383be5e6181STimur Tabi Define this option if you want to use Freescale's I2C driver in 1384be5e6181STimur Tabi drivers/fsl_i2c.c. 1385be5e6181STimur Tabi 1386be5e6181STimur Tabi 1387c609719bSwdenk- SPI Support: CONFIG_SPI 1388c609719bSwdenk 1389c609719bSwdenk Enables SPI driver (so far only tested with 1390c609719bSwdenk SPI EEPROM, also an instance works with Crystal A/D and 1391c609719bSwdenk D/As on the SACSng board) 1392c609719bSwdenk 1393c609719bSwdenk CONFIG_SPI_X 1394c609719bSwdenk 1395c609719bSwdenk Enables extended (16-bit) SPI EEPROM addressing. 1396c609719bSwdenk (symmetrical to CONFIG_I2C_X) 1397c609719bSwdenk 1398c609719bSwdenk CONFIG_SOFT_SPI 1399c609719bSwdenk 1400c609719bSwdenk Enables a software (bit-bang) SPI driver rather than 1401c609719bSwdenk using hardware support. This is a general purpose 1402c609719bSwdenk driver that only requires three general I/O port pins 1403c609719bSwdenk (two outputs, one input) to function. If this is 1404c609719bSwdenk defined, the board configuration must define several 1405c609719bSwdenk SPI configuration items (port pins to use, etc). For 1406c609719bSwdenk an example, see include/configs/sacsng.h. 1407c609719bSwdenk 1408c609719bSwdenk- FPGA Support: CONFIG_FPGA_COUNT 1409c609719bSwdenk 1410c609719bSwdenk Specify the number of FPGA devices to support. 1411c609719bSwdenk 1412c609719bSwdenk CONFIG_FPGA 1413c609719bSwdenk 1414c609719bSwdenk Used to specify the types of FPGA devices. For example, 1415c609719bSwdenk #define CONFIG_FPGA CFG_XILINX_VIRTEX2 1416c609719bSwdenk 1417c609719bSwdenk CFG_FPGA_PROG_FEEDBACK 1418c609719bSwdenk 1419c609719bSwdenk Enable printing of hash marks during FPGA configuration. 1420c609719bSwdenk 1421c609719bSwdenk CFG_FPGA_CHECK_BUSY 1422c609719bSwdenk 1423c609719bSwdenk Enable checks on FPGA configuration interface busy 1424c609719bSwdenk status by the configuration function. This option 1425c609719bSwdenk will require a board or device specific function to 1426c609719bSwdenk be written. 1427c609719bSwdenk 1428c609719bSwdenk CONFIG_FPGA_DELAY 1429c609719bSwdenk 1430c609719bSwdenk If defined, a function that provides delays in the FPGA 1431c609719bSwdenk configuration driver. 1432c609719bSwdenk 1433c609719bSwdenk CFG_FPGA_CHECK_CTRLC 1434c609719bSwdenk Allow Control-C to interrupt FPGA configuration 1435c609719bSwdenk 1436c609719bSwdenk CFG_FPGA_CHECK_ERROR 1437c609719bSwdenk 1438c609719bSwdenk Check for configuration errors during FPGA bitfile 1439c609719bSwdenk loading. For example, abort during Virtex II 1440c609719bSwdenk configuration if the INIT_B line goes low (which 1441c609719bSwdenk indicated a CRC error). 1442c609719bSwdenk 1443c609719bSwdenk CFG_FPGA_WAIT_INIT 1444c609719bSwdenk 1445c609719bSwdenk Maximum time to wait for the INIT_B line to deassert 1446c609719bSwdenk after PROB_B has been deasserted during a Virtex II 1447c609719bSwdenk FPGA configuration sequence. The default time is 500 1448c609719bSwdenk mS. 1449c609719bSwdenk 1450c609719bSwdenk CFG_FPGA_WAIT_BUSY 1451c609719bSwdenk 1452c609719bSwdenk Maximum time to wait for BUSY to deassert during 1453c609719bSwdenk Virtex II FPGA configuration. The default is 5 mS. 1454c609719bSwdenk 1455c609719bSwdenk CFG_FPGA_WAIT_CONFIG 1456c609719bSwdenk 1457c609719bSwdenk Time to wait after FPGA configuration. The default is 1458c609719bSwdenk 200 mS. 1459c609719bSwdenk 1460c609719bSwdenk- Configuration Management: 1461c609719bSwdenk CONFIG_IDENT_STRING 1462c609719bSwdenk 1463c609719bSwdenk If defined, this string will be added to the U-Boot 1464c609719bSwdenk version information (U_BOOT_VERSION) 1465c609719bSwdenk 1466c609719bSwdenk- Vendor Parameter Protection: 1467c609719bSwdenk 1468c609719bSwdenk U-Boot considers the values of the environment 1469c609719bSwdenk variables "serial#" (Board Serial Number) and 14707152b1d0Swdenk "ethaddr" (Ethernet Address) to be parameters that 1471c609719bSwdenk are set once by the board vendor / manufacturer, and 1472c609719bSwdenk protects these variables from casual modification by 1473c609719bSwdenk the user. Once set, these variables are read-only, 1474c609719bSwdenk and write or delete attempts are rejected. You can 1475c609719bSwdenk change this behviour: 1476c609719bSwdenk 1477c609719bSwdenk If CONFIG_ENV_OVERWRITE is #defined in your config 1478c609719bSwdenk file, the write protection for vendor parameters is 147947cd00faSwdenk completely disabled. Anybody can change or delete 1480c609719bSwdenk these parameters. 1481c609719bSwdenk 1482c609719bSwdenk Alternatively, if you #define _both_ CONFIG_ETHADDR 1483c609719bSwdenk _and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default 1484c609719bSwdenk ethernet address is installed in the environment, 1485c609719bSwdenk which can be changed exactly ONCE by the user. [The 1486c609719bSwdenk serial# is unaffected by this, i. e. it remains 1487c609719bSwdenk read-only.] 1488c609719bSwdenk 1489c609719bSwdenk- Protected RAM: 1490c609719bSwdenk CONFIG_PRAM 1491c609719bSwdenk 1492c609719bSwdenk Define this variable to enable the reservation of 1493c609719bSwdenk "protected RAM", i. e. RAM which is not overwritten 1494c609719bSwdenk by U-Boot. Define CONFIG_PRAM to hold the number of 1495c609719bSwdenk kB you want to reserve for pRAM. You can overwrite 1496c609719bSwdenk this default value by defining an environment 1497c609719bSwdenk variable "pram" to the number of kB you want to 1498c609719bSwdenk reserve. Note that the board info structure will 1499c609719bSwdenk still show the full amount of RAM. If pRAM is 1500c609719bSwdenk reserved, a new environment variable "mem" will 1501c609719bSwdenk automatically be defined to hold the amount of 1502c609719bSwdenk remaining RAM in a form that can be passed as boot 1503c609719bSwdenk argument to Linux, for instance like that: 1504c609719bSwdenk 1505fe126d8bSWolfgang Denk setenv bootargs ... mem=\${mem} 1506c609719bSwdenk saveenv 1507c609719bSwdenk 1508c609719bSwdenk This way you can tell Linux not to use this memory, 1509c609719bSwdenk either, which results in a memory region that will 1510c609719bSwdenk not be affected by reboots. 1511c609719bSwdenk 1512c609719bSwdenk *WARNING* If your board configuration uses automatic 1513c609719bSwdenk detection of the RAM size, you must make sure that 1514c609719bSwdenk this memory test is non-destructive. So far, the 1515c609719bSwdenk following board configurations are known to be 1516c609719bSwdenk "pRAM-clean": 1517c609719bSwdenk 1518c609719bSwdenk ETX094, IVMS8, IVML24, SPD8xx, TQM8xxL, 1519c609719bSwdenk HERMES, IP860, RPXlite, LWMON, LANTEC, 1520c609719bSwdenk PCU_E, FLAGADM, TQM8260 1521c609719bSwdenk 1522c609719bSwdenk- Error Recovery: 1523c609719bSwdenk CONFIG_PANIC_HANG 1524c609719bSwdenk 1525c609719bSwdenk Define this variable to stop the system in case of a 1526c609719bSwdenk fatal error, so that you have to reset it manually. 1527c609719bSwdenk This is probably NOT a good idea for an embedded 1528c609719bSwdenk system where you want to system to reboot 1529c609719bSwdenk automatically as fast as possible, but it may be 1530c609719bSwdenk useful during development since you can try to debug 1531c609719bSwdenk the conditions that lead to the situation. 1532c609719bSwdenk 1533c609719bSwdenk CONFIG_NET_RETRY_COUNT 1534c609719bSwdenk 1535c609719bSwdenk This variable defines the number of retries for 1536c609719bSwdenk network operations like ARP, RARP, TFTP, or BOOTP 1537c609719bSwdenk before giving up the operation. If not defined, a 1538c609719bSwdenk default value of 5 is used. 1539c609719bSwdenk 1540c609719bSwdenk- Command Interpreter: 15418078f1a5SWolfgang Denk CONFIG_AUTO_COMPLETE 154204a85b3bSwdenk 154304a85b3bSwdenk Enable auto completion of commands using TAB. 154404a85b3bSwdenk 15458078f1a5SWolfgang Denk Note that this feature has NOT been implemented yet 15468078f1a5SWolfgang Denk for the "hush" shell. 15478078f1a5SWolfgang Denk 15488078f1a5SWolfgang Denk 1549c609719bSwdenk CFG_HUSH_PARSER 1550c609719bSwdenk 1551c609719bSwdenk Define this variable to enable the "hush" shell (from 1552c609719bSwdenk Busybox) as command line interpreter, thus enabling 1553c609719bSwdenk powerful command line syntax like 1554c609719bSwdenk if...then...else...fi conditionals or `&&' and '||' 1555c609719bSwdenk constructs ("shell scripts"). 1556c609719bSwdenk 1557c609719bSwdenk If undefined, you get the old, much simpler behaviour 1558c609719bSwdenk with a somewhat smaller memory footprint. 1559c609719bSwdenk 1560c609719bSwdenk 1561c609719bSwdenk CFG_PROMPT_HUSH_PS2 1562c609719bSwdenk 1563c609719bSwdenk This defines the secondary prompt string, which is 1564c609719bSwdenk printed when the command interpreter needs more input 1565c609719bSwdenk to complete a command. Usually "> ". 1566c609719bSwdenk 1567c609719bSwdenk Note: 1568c609719bSwdenk 1569c609719bSwdenk In the current implementation, the local variables 1570c609719bSwdenk space and global environment variables space are 1571c609719bSwdenk separated. Local variables are those you define by 15723b57fe0aSwdenk simply typing `name=value'. To access a local 1573c609719bSwdenk variable later on, you have write `$name' or 15743b57fe0aSwdenk `${name}'; to execute the contents of a variable 15753b57fe0aSwdenk directly type `$name' at the command prompt. 1576c609719bSwdenk 1577c609719bSwdenk Global environment variables are those you use 1578c609719bSwdenk setenv/printenv to work with. To run a command stored 1579c609719bSwdenk in such a variable, you need to use the run command, 1580c609719bSwdenk and you must not use the '$' sign to access them. 1581c609719bSwdenk 1582c609719bSwdenk To store commands and special characters in a 1583c609719bSwdenk variable, please use double quotation marks 1584c609719bSwdenk surrounding the whole text of the variable, instead 1585c609719bSwdenk of the backslashes before semicolons and special 1586c609719bSwdenk symbols. 1587c609719bSwdenk 1588aa0c71acSWolfgang Denk- Commandline Editing and History: 1589aa0c71acSWolfgang Denk CONFIG_CMDLINE_EDITING 1590aa0c71acSWolfgang Denk 1591aa0c71acSWolfgang Denk Enable editiong and History functions for interactive 1592aa0c71acSWolfgang Denk commandline input operations 1593aa0c71acSWolfgang Denk 1594a8c7c708Swdenk- Default Environment: 1595c609719bSwdenk CONFIG_EXTRA_ENV_SETTINGS 1596c609719bSwdenk 1597c609719bSwdenk Define this to contain any number of null terminated 1598c609719bSwdenk strings (variable = value pairs) that will be part of 15997152b1d0Swdenk the default environment compiled into the boot image. 16002262cfeeSwdenk 1601c609719bSwdenk For example, place something like this in your 1602c609719bSwdenk board's config file: 1603c609719bSwdenk 1604c609719bSwdenk #define CONFIG_EXTRA_ENV_SETTINGS \ 1605c609719bSwdenk "myvar1=value1\0" \ 1606c609719bSwdenk "myvar2=value2\0" 1607c609719bSwdenk 1608c609719bSwdenk Warning: This method is based on knowledge about the 1609c609719bSwdenk internal format how the environment is stored by the 16102262cfeeSwdenk U-Boot code. This is NOT an official, exported 1611c609719bSwdenk interface! Although it is unlikely that this format 16127152b1d0Swdenk will change soon, there is no guarantee either. 1613c609719bSwdenk You better know what you are doing here. 1614c609719bSwdenk 1615c609719bSwdenk Note: overly (ab)use of the default environment is 1616c609719bSwdenk discouraged. Make sure to check other ways to preset 1617c609719bSwdenk the environment like the autoscript function or the 1618c609719bSwdenk boot command first. 1619c609719bSwdenk 1620a8c7c708Swdenk- DataFlash Support: 16212abbe075Swdenk CONFIG_HAS_DATAFLASH 16222abbe075Swdenk 16232abbe075Swdenk Defining this option enables DataFlash features and 16242abbe075Swdenk allows to read/write in Dataflash via the standard 16252abbe075Swdenk commands cp, md... 16262abbe075Swdenk 16273f85ce27Swdenk- SystemACE Support: 16283f85ce27Swdenk CONFIG_SYSTEMACE 16293f85ce27Swdenk 16303f85ce27Swdenk Adding this option adds support for Xilinx SystemACE 16313f85ce27Swdenk chips attached via some sort of local bus. The address 16323f85ce27Swdenk of the chip must alsh be defined in the 16333f85ce27Swdenk CFG_SYSTEMACE_BASE macro. For example: 16343f85ce27Swdenk 16353f85ce27Swdenk #define CONFIG_SYSTEMACE 16363f85ce27Swdenk #define CFG_SYSTEMACE_BASE 0xf0000000 16373f85ce27Swdenk 16383f85ce27Swdenk When SystemACE support is added, the "ace" device type 16393f85ce27Swdenk becomes available to the fat commands, i.e. fatls. 16403f85ce27Swdenk 1641ecb0ccd9SWolfgang Denk- TFTP Fixed UDP Port: 1642ecb0ccd9SWolfgang Denk CONFIG_TFTP_PORT 1643ecb0ccd9SWolfgang Denk 164428cb9375SWolfgang Denk If this is defined, the environment variable tftpsrcp 1645ecb0ccd9SWolfgang Denk is used to supply the TFTP UDP source port value. 164628cb9375SWolfgang Denk If tftpsrcp isn't defined, the normal pseudo-random port 1647ecb0ccd9SWolfgang Denk number generator is used. 1648ecb0ccd9SWolfgang Denk 164928cb9375SWolfgang Denk Also, the environment variable tftpdstp is used to supply 165028cb9375SWolfgang Denk the TFTP UDP destination port value. If tftpdstp isn't 165128cb9375SWolfgang Denk defined, the normal port 69 is used. 165228cb9375SWolfgang Denk 165328cb9375SWolfgang Denk The purpose for tftpsrcp is to allow a TFTP server to 1654ecb0ccd9SWolfgang Denk blindly start the TFTP transfer using the pre-configured 1655ecb0ccd9SWolfgang Denk target IP address and UDP port. This has the effect of 1656ecb0ccd9SWolfgang Denk "punching through" the (Windows XP) firewall, allowing 1657ecb0ccd9SWolfgang Denk the remainder of the TFTP transfer to proceed normally. 1658ecb0ccd9SWolfgang Denk A better solution is to properly configure the firewall, 1659ecb0ccd9SWolfgang Denk but sometimes that is not allowed. 1660ecb0ccd9SWolfgang Denk 1661a8c7c708Swdenk- Show boot progress: 1662c609719bSwdenk CONFIG_SHOW_BOOT_PROGRESS 1663c609719bSwdenk 1664c609719bSwdenk Defining this option allows to add some board- 1665c609719bSwdenk specific code (calling a user-provided function 1666c609719bSwdenk "show_boot_progress(int)") that enables you to show 1667c609719bSwdenk the system's boot progress on some display (for 1668c609719bSwdenk example, some LED's) on your board. At the moment, 1669c609719bSwdenk the following checkpoints are implemented: 1670c609719bSwdenk 1671c609719bSwdenk Arg Where When 1672c609719bSwdenk 1 common/cmd_bootm.c before attempting to boot an image 1673c609719bSwdenk -1 common/cmd_bootm.c Image header has bad magic number 1674c609719bSwdenk 2 common/cmd_bootm.c Image header has correct magic number 1675c609719bSwdenk -2 common/cmd_bootm.c Image header has bad checksum 1676c609719bSwdenk 3 common/cmd_bootm.c Image header has correct checksum 1677c609719bSwdenk -3 common/cmd_bootm.c Image data has bad checksum 1678c609719bSwdenk 4 common/cmd_bootm.c Image data has correct checksum 1679c609719bSwdenk -4 common/cmd_bootm.c Image is for unsupported architecture 1680c609719bSwdenk 5 common/cmd_bootm.c Architecture check OK 1681c609719bSwdenk -5 common/cmd_bootm.c Wrong Image Type (not kernel, multi, standalone) 1682c609719bSwdenk 6 common/cmd_bootm.c Image Type check OK 1683c609719bSwdenk -6 common/cmd_bootm.c gunzip uncompression error 1684c609719bSwdenk -7 common/cmd_bootm.c Unimplemented compression type 1685c609719bSwdenk 7 common/cmd_bootm.c Uncompression OK 1686c609719bSwdenk -8 common/cmd_bootm.c Wrong Image Type (not kernel, multi, standalone) 1687c609719bSwdenk 8 common/cmd_bootm.c Image Type check OK 1688c609719bSwdenk -9 common/cmd_bootm.c Unsupported OS (not Linux, BSD, VxWorks, QNX) 1689c609719bSwdenk 9 common/cmd_bootm.c Start initial ramdisk verification 1690c609719bSwdenk -10 common/cmd_bootm.c Ramdisk header has bad magic number 1691c609719bSwdenk -11 common/cmd_bootm.c Ramdisk header has bad checksum 1692c609719bSwdenk 10 common/cmd_bootm.c Ramdisk header is OK 1693c609719bSwdenk -12 common/cmd_bootm.c Ramdisk data has bad checksum 1694c609719bSwdenk 11 common/cmd_bootm.c Ramdisk data has correct checksum 1695c609719bSwdenk 12 common/cmd_bootm.c Ramdisk verification complete, start loading 1696c609719bSwdenk -13 common/cmd_bootm.c Wrong Image Type (not PPC Linux Ramdisk) 1697c609719bSwdenk 13 common/cmd_bootm.c Start multifile image verification 1698c609719bSwdenk 14 common/cmd_bootm.c No initial ramdisk, no multifile, continue. 1699c609719bSwdenk 15 common/cmd_bootm.c All preparation done, transferring control to OS 1700c609719bSwdenk 170163e73c9aSwdenk -30 lib_ppc/board.c Fatal error, hang the system 170263e73c9aSwdenk -31 post/post.c POST test failed, detected by post_output_backlog() 170363e73c9aSwdenk -32 post/post.c POST test failed, detected by post_run_single() 170463e73c9aSwdenk 1705c609719bSwdenk -1 common/cmd_doc.c Bad usage of "doc" command 1706c609719bSwdenk -1 common/cmd_doc.c No boot device 1707c609719bSwdenk -1 common/cmd_doc.c Unknown Chip ID on boot device 1708c609719bSwdenk -1 common/cmd_doc.c Read Error on boot device 1709c609719bSwdenk -1 common/cmd_doc.c Image header has bad magic number 1710c609719bSwdenk 1711c609719bSwdenk -1 common/cmd_ide.c Bad usage of "ide" command 1712c609719bSwdenk -1 common/cmd_ide.c No boot device 1713c609719bSwdenk -1 common/cmd_ide.c Unknown boot device 1714c609719bSwdenk -1 common/cmd_ide.c Unknown partition table 1715c609719bSwdenk -1 common/cmd_ide.c Invalid partition type 1716c609719bSwdenk -1 common/cmd_ide.c Read Error on boot device 1717c609719bSwdenk -1 common/cmd_ide.c Image header has bad magic number 1718c609719bSwdenk 1719206c60cbSwdenk -1 common/cmd_nand.c Bad usage of "nand" command 1720206c60cbSwdenk -1 common/cmd_nand.c No boot device 1721206c60cbSwdenk -1 common/cmd_nand.c Unknown Chip ID on boot device 1722206c60cbSwdenk -1 common/cmd_nand.c Read Error on boot device 1723206c60cbSwdenk -1 common/cmd_nand.c Image header has bad magic number 1724206c60cbSwdenk 1725206c60cbSwdenk -1 common/env_common.c Environment has a bad CRC, using default 1726c609719bSwdenk 1727c609719bSwdenk 1728c609719bSwdenkModem Support: 1729c609719bSwdenk-------------- 1730c609719bSwdenk 173185ec0bccSwdenk[so far only for SMDK2400 and TRAB boards] 1732c609719bSwdenk 1733c609719bSwdenk- Modem support endable: 1734c609719bSwdenk CONFIG_MODEM_SUPPORT 1735c609719bSwdenk 1736c609719bSwdenk- RTS/CTS Flow control enable: 1737c609719bSwdenk CONFIG_HWFLOW 1738c609719bSwdenk 1739c609719bSwdenk- Modem debug support: 1740c609719bSwdenk CONFIG_MODEM_SUPPORT_DEBUG 1741c609719bSwdenk 1742c609719bSwdenk Enables debugging stuff (char screen[1024], dbg()) 1743c609719bSwdenk for modem support. Useful only with BDI2000. 1744c609719bSwdenk 1745a8c7c708Swdenk- Interrupt support (PPC): 1746a8c7c708Swdenk 1747a8c7c708Swdenk There are common interrupt_init() and timer_interrupt() 1748a8c7c708Swdenk for all PPC archs. interrupt_init() calls interrupt_init_cpu() 1749a8c7c708Swdenk for cpu specific initialization. interrupt_init_cpu() 1750a8c7c708Swdenk should set decrementer_count to appropriate value. If 1751a8c7c708Swdenk cpu resets decrementer automatically after interrupt 1752a8c7c708Swdenk (ppc4xx) it should set decrementer_count to zero. 1753a8c7c708Swdenk timer_interrupt() calls timer_interrupt_cpu() for cpu 1754a8c7c708Swdenk specific handling. If board has watchdog / status_led 1755a8c7c708Swdenk / other_activity_monitor it works automatically from 1756a8c7c708Swdenk general timer_interrupt(). 1757a8c7c708Swdenk 1758c609719bSwdenk- General: 1759c609719bSwdenk 1760c609719bSwdenk In the target system modem support is enabled when a 1761c609719bSwdenk specific key (key combination) is pressed during 1762c609719bSwdenk power-on. Otherwise U-Boot will boot normally 1763c609719bSwdenk (autoboot). The key_pressed() fuction is called from 1764c609719bSwdenk board_init(). Currently key_pressed() is a dummy 1765c609719bSwdenk function, returning 1 and thus enabling modem 1766c609719bSwdenk initialization. 1767c609719bSwdenk 1768c609719bSwdenk If there are no modem init strings in the 1769c609719bSwdenk environment, U-Boot proceed to autoboot; the 1770c609719bSwdenk previous output (banner, info printfs) will be 1771c609719bSwdenk supressed, though. 1772c609719bSwdenk 1773c609719bSwdenk See also: doc/README.Modem 1774c609719bSwdenk 1775c609719bSwdenk 1776c609719bSwdenkConfiguration Settings: 1777c609719bSwdenk----------------------- 1778c609719bSwdenk 1779c609719bSwdenk- CFG_LONGHELP: Defined when you want long help messages included; 1780c609719bSwdenk undefine this when you're short of memory. 1781c609719bSwdenk 1782c609719bSwdenk- CFG_PROMPT: This is what U-Boot prints on the console to 1783c609719bSwdenk prompt for user input. 1784c609719bSwdenk 1785c609719bSwdenk- CFG_CBSIZE: Buffer size for input from the Console 1786c609719bSwdenk 1787c609719bSwdenk- CFG_PBSIZE: Buffer size for Console output 1788c609719bSwdenk 1789c609719bSwdenk- CFG_MAXARGS: max. Number of arguments accepted for monitor commands 1790c609719bSwdenk 1791c609719bSwdenk- CFG_BARGSIZE: Buffer size for Boot Arguments which are passed to 1792c609719bSwdenk the application (usually a Linux kernel) when it is 1793c609719bSwdenk booted 1794c609719bSwdenk 1795c609719bSwdenk- CFG_BAUDRATE_TABLE: 1796c609719bSwdenk List of legal baudrate settings for this board. 1797c609719bSwdenk 1798c609719bSwdenk- CFG_CONSOLE_INFO_QUIET 1799c609719bSwdenk Suppress display of console information at boot. 1800c609719bSwdenk 1801c609719bSwdenk- CFG_CONSOLE_IS_IN_ENV 1802c609719bSwdenk If the board specific function 1803c609719bSwdenk extern int overwrite_console (void); 1804c609719bSwdenk returns 1, the stdin, stderr and stdout are switched to the 1805c609719bSwdenk serial port, else the settings in the environment are used. 1806c609719bSwdenk 1807c609719bSwdenk- CFG_CONSOLE_OVERWRITE_ROUTINE 1808c609719bSwdenk Enable the call to overwrite_console(). 1809c609719bSwdenk 1810c609719bSwdenk- CFG_CONSOLE_ENV_OVERWRITE 1811c609719bSwdenk Enable overwrite of previous console environment settings. 1812c609719bSwdenk 1813c609719bSwdenk- CFG_MEMTEST_START, CFG_MEMTEST_END: 1814c609719bSwdenk Begin and End addresses of the area used by the 1815c609719bSwdenk simple memory test. 1816c609719bSwdenk 1817c609719bSwdenk- CFG_ALT_MEMTEST: 1818c609719bSwdenk Enable an alternate, more extensive memory test. 1819c609719bSwdenk 18205f535fe1Swdenk- CFG_MEMTEST_SCRATCH: 18215f535fe1Swdenk Scratch address used by the alternate memory test 18225f535fe1Swdenk You only need to set this if address zero isn't writeable 18235f535fe1Swdenk 1824c609719bSwdenk- CFG_TFTP_LOADADDR: 1825c609719bSwdenk Default load address for network file downloads 1826c609719bSwdenk 1827c609719bSwdenk- CFG_LOADS_BAUD_CHANGE: 1828c609719bSwdenk Enable temporary baudrate change while serial download 1829c609719bSwdenk 1830c609719bSwdenk- CFG_SDRAM_BASE: 1831c609719bSwdenk Physical start address of SDRAM. _Must_ be 0 here. 1832c609719bSwdenk 1833c609719bSwdenk- CFG_MBIO_BASE: 1834c609719bSwdenk Physical start address of Motherboard I/O (if using a 1835c609719bSwdenk Cogent motherboard) 1836c609719bSwdenk 1837c609719bSwdenk- CFG_FLASH_BASE: 1838c609719bSwdenk Physical start address of Flash memory. 1839c609719bSwdenk 1840c609719bSwdenk- CFG_MONITOR_BASE: 1841c609719bSwdenk Physical start address of boot monitor code (set by 1842c609719bSwdenk make config files to be same as the text base address 1843c609719bSwdenk (TEXT_BASE) used when linking) - same as 1844c609719bSwdenk CFG_FLASH_BASE when booting from flash. 1845c609719bSwdenk 1846c609719bSwdenk- CFG_MONITOR_LEN: 18473b57fe0aSwdenk Size of memory reserved for monitor code, used to 18483b57fe0aSwdenk determine _at_compile_time_ (!) if the environment is 18493b57fe0aSwdenk embedded within the U-Boot image, or in a separate 18503b57fe0aSwdenk flash sector. 1851c609719bSwdenk 1852c609719bSwdenk- CFG_MALLOC_LEN: 1853c609719bSwdenk Size of DRAM reserved for malloc() use. 1854c609719bSwdenk 185515940c9aSStefan Roese- CFG_BOOTM_LEN: 185615940c9aSStefan Roese Normally compressed uImages are limited to an 185715940c9aSStefan Roese uncompressed size of 8 MBytes. If this is not enough, 185815940c9aSStefan Roese you can define CFG_BOOTM_LEN in your board config file 185915940c9aSStefan Roese to adjust this setting to your needs. 1860c609719bSwdenk 1861c609719bSwdenk- CFG_BOOTMAPSZ: 1862c609719bSwdenk Maximum size of memory mapped by the startup code of 1863c609719bSwdenk the Linux kernel; all data that must be processed by 1864c609719bSwdenk the Linux kernel (bd_info, boot arguments, eventually 1865c609719bSwdenk initrd image) must be put below this limit. 1866c609719bSwdenk 1867c609719bSwdenk- CFG_MAX_FLASH_BANKS: 1868c609719bSwdenk Max number of Flash memory banks 1869c609719bSwdenk 1870c609719bSwdenk- CFG_MAX_FLASH_SECT: 1871c609719bSwdenk Max number of sectors on a Flash chip 1872c609719bSwdenk 1873c609719bSwdenk- CFG_FLASH_ERASE_TOUT: 1874c609719bSwdenk Timeout for Flash erase operations (in ms) 1875c609719bSwdenk 1876c609719bSwdenk- CFG_FLASH_WRITE_TOUT: 1877c609719bSwdenk Timeout for Flash write operations (in ms) 1878c609719bSwdenk 18798564acf9Swdenk- CFG_FLASH_LOCK_TOUT 18808564acf9Swdenk Timeout for Flash set sector lock bit operation (in ms) 18818564acf9Swdenk 18828564acf9Swdenk- CFG_FLASH_UNLOCK_TOUT 18838564acf9Swdenk Timeout for Flash clear lock bits operation (in ms) 18848564acf9Swdenk 18858564acf9Swdenk- CFG_FLASH_PROTECTION 18868564acf9Swdenk If defined, hardware flash sectors protection is used 18878564acf9Swdenk instead of U-Boot software protection. 18888564acf9Swdenk 1889c609719bSwdenk- CFG_DIRECT_FLASH_TFTP: 1890c609719bSwdenk 1891c609719bSwdenk Enable TFTP transfers directly to flash memory; 1892c609719bSwdenk without this option such a download has to be 1893c609719bSwdenk performed in two steps: (1) download to RAM, and (2) 1894c609719bSwdenk copy from RAM to flash. 1895c609719bSwdenk 1896c609719bSwdenk The two-step approach is usually more reliable, since 1897c609719bSwdenk you can check if the download worked before you erase 1898c609719bSwdenk the flash, but in some situations (when sytem RAM is 1899c609719bSwdenk too limited to allow for a tempory copy of the 1900c609719bSwdenk downloaded image) this option may be very useful. 1901c609719bSwdenk 1902c609719bSwdenk- CFG_FLASH_CFI: 1903c609719bSwdenk Define if the flash driver uses extra elements in the 19045653fc33Swdenk common flash structure for storing flash geometry. 19055653fc33Swdenk 19065653fc33Swdenk- CFG_FLASH_CFI_DRIVER 19075653fc33Swdenk This option also enables the building of the cfi_flash driver 19085653fc33Swdenk in the drivers directory 190953cf9435Sstroese 19105568e613SStefan Roese- CFG_FLASH_QUIET_TEST 19115568e613SStefan Roese If this option is defined, the common CFI flash doesn't 19125568e613SStefan Roese print it's warning upon not recognized FLASH banks. This 19135568e613SStefan Roese is useful, if some of the configured banks are only 19145568e613SStefan Roese optionally available. 19155568e613SStefan Roese 191653cf9435Sstroese- CFG_RX_ETH_BUFFER: 191753cf9435Sstroese Defines the number of ethernet receive buffers. On some 191853cf9435Sstroese ethernet controllers it is recommended to set this value 191953cf9435Sstroese to 8 or even higher (EEPRO100 or 405 EMAC), since all 192053cf9435Sstroese buffers can be full shortly after enabling the interface 192153cf9435Sstroese on high ethernet traffic. 192253cf9435Sstroese Defaults to 4 if not defined. 1923c609719bSwdenk 1924c609719bSwdenkThe following definitions that deal with the placement and management 1925c609719bSwdenkof environment data (variable area); in general, we support the 1926c609719bSwdenkfollowing configurations: 1927c609719bSwdenk 1928c609719bSwdenk- CFG_ENV_IS_IN_FLASH: 1929c609719bSwdenk 1930c609719bSwdenk Define this if the environment is in flash memory. 1931c609719bSwdenk 1932c609719bSwdenk a) The environment occupies one whole flash sector, which is 1933c609719bSwdenk "embedded" in the text segment with the U-Boot code. This 1934c609719bSwdenk happens usually with "bottom boot sector" or "top boot 1935c609719bSwdenk sector" type flash chips, which have several smaller 1936c609719bSwdenk sectors at the start or the end. For instance, such a 1937c609719bSwdenk layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In 1938c609719bSwdenk such a case you would place the environment in one of the 1939c609719bSwdenk 4 kB sectors - with U-Boot code before and after it. With 1940c609719bSwdenk "top boot sector" type flash chips, you would put the 1941c609719bSwdenk environment in one of the last sectors, leaving a gap 1942c609719bSwdenk between U-Boot and the environment. 1943c609719bSwdenk 1944c609719bSwdenk - CFG_ENV_OFFSET: 1945c609719bSwdenk 1946c609719bSwdenk Offset of environment data (variable area) to the 1947c609719bSwdenk beginning of flash memory; for instance, with bottom boot 1948c609719bSwdenk type flash chips the second sector can be used: the offset 1949c609719bSwdenk for this sector is given here. 1950c609719bSwdenk 1951c609719bSwdenk CFG_ENV_OFFSET is used relative to CFG_FLASH_BASE. 1952c609719bSwdenk 1953c609719bSwdenk - CFG_ENV_ADDR: 1954c609719bSwdenk 1955c609719bSwdenk This is just another way to specify the start address of 1956c609719bSwdenk the flash sector containing the environment (instead of 1957c609719bSwdenk CFG_ENV_OFFSET). 1958c609719bSwdenk 1959c609719bSwdenk - CFG_ENV_SECT_SIZE: 1960c609719bSwdenk 1961c609719bSwdenk Size of the sector containing the environment. 1962c609719bSwdenk 1963c609719bSwdenk 1964c609719bSwdenk b) Sometimes flash chips have few, equal sized, BIG sectors. 1965c609719bSwdenk In such a case you don't want to spend a whole sector for 1966c609719bSwdenk the environment. 1967c609719bSwdenk 1968c609719bSwdenk - CFG_ENV_SIZE: 1969c609719bSwdenk 1970c609719bSwdenk If you use this in combination with CFG_ENV_IS_IN_FLASH 1971c609719bSwdenk and CFG_ENV_SECT_SIZE, you can specify to use only a part 1972c609719bSwdenk of this flash sector for the environment. This saves 1973c609719bSwdenk memory for the RAM copy of the environment. 1974c609719bSwdenk 1975c609719bSwdenk It may also save flash memory if you decide to use this 1976c609719bSwdenk when your environment is "embedded" within U-Boot code, 1977c609719bSwdenk since then the remainder of the flash sector could be used 1978c609719bSwdenk for U-Boot code. It should be pointed out that this is 1979c609719bSwdenk STRONGLY DISCOURAGED from a robustness point of view: 1980c609719bSwdenk updating the environment in flash makes it always 1981c609719bSwdenk necessary to erase the WHOLE sector. If something goes 1982c609719bSwdenk wrong before the contents has been restored from a copy in 1983c609719bSwdenk RAM, your target system will be dead. 1984c609719bSwdenk 1985c609719bSwdenk - CFG_ENV_ADDR_REDUND 1986c609719bSwdenk CFG_ENV_SIZE_REDUND 1987c609719bSwdenk 1988c609719bSwdenk These settings describe a second storage area used to hold 1989c609719bSwdenk a redundand copy of the environment data, so that there is 19903e38691eSwdenk a valid backup copy in case there is a power failure during 1991c609719bSwdenk a "saveenv" operation. 1992c609719bSwdenk 1993c609719bSwdenkBE CAREFUL! Any changes to the flash layout, and some changes to the 1994c609719bSwdenksource code will make it necessary to adapt <board>/u-boot.lds* 1995c609719bSwdenkaccordingly! 1996c609719bSwdenk 1997c609719bSwdenk 1998c609719bSwdenk- CFG_ENV_IS_IN_NVRAM: 1999c609719bSwdenk 2000c609719bSwdenk Define this if you have some non-volatile memory device 2001c609719bSwdenk (NVRAM, battery buffered SRAM) which you want to use for the 2002c609719bSwdenk environment. 2003c609719bSwdenk 2004c609719bSwdenk - CFG_ENV_ADDR: 2005c609719bSwdenk - CFG_ENV_SIZE: 2006c609719bSwdenk 2007c609719bSwdenk These two #defines are used to determin the memory area you 2008c609719bSwdenk want to use for environment. It is assumed that this memory 2009c609719bSwdenk can just be read and written to, without any special 2010c609719bSwdenk provision. 2011c609719bSwdenk 2012c609719bSwdenkBE CAREFUL! The first access to the environment happens quite early 2013c609719bSwdenkin U-Boot initalization (when we try to get the setting of for the 2014c609719bSwdenkconsole baudrate). You *MUST* have mappend your NVRAM area then, or 2015c609719bSwdenkU-Boot will hang. 2016c609719bSwdenk 2017c609719bSwdenkPlease note that even with NVRAM we still use a copy of the 2018c609719bSwdenkenvironment in RAM: we could work on NVRAM directly, but we want to 2019c609719bSwdenkkeep settings there always unmodified except somebody uses "saveenv" 2020c609719bSwdenkto save the current settings. 2021c609719bSwdenk 2022c609719bSwdenk 2023c609719bSwdenk- CFG_ENV_IS_IN_EEPROM: 2024c609719bSwdenk 2025c609719bSwdenk Use this if you have an EEPROM or similar serial access 2026c609719bSwdenk device and a driver for it. 2027c609719bSwdenk 2028c609719bSwdenk - CFG_ENV_OFFSET: 2029c609719bSwdenk - CFG_ENV_SIZE: 2030c609719bSwdenk 2031c609719bSwdenk These two #defines specify the offset and size of the 2032c609719bSwdenk environment area within the total memory of your EEPROM. 2033c609719bSwdenk 2034c609719bSwdenk - CFG_I2C_EEPROM_ADDR: 2035c609719bSwdenk If defined, specified the chip address of the EEPROM device. 2036c609719bSwdenk The default address is zero. 2037c609719bSwdenk 2038c609719bSwdenk - CFG_EEPROM_PAGE_WRITE_BITS: 2039c609719bSwdenk If defined, the number of bits used to address bytes in a 2040c609719bSwdenk single page in the EEPROM device. A 64 byte page, for example 2041c609719bSwdenk would require six bits. 2042c609719bSwdenk 2043c609719bSwdenk - CFG_EEPROM_PAGE_WRITE_DELAY_MS: 2044c609719bSwdenk If defined, the number of milliseconds to delay between 2045c609719bSwdenk page writes. The default is zero milliseconds. 2046c609719bSwdenk 2047c609719bSwdenk - CFG_I2C_EEPROM_ADDR_LEN: 2048c609719bSwdenk The length in bytes of the EEPROM memory array address. Note 2049c609719bSwdenk that this is NOT the chip address length! 2050c609719bSwdenk 20515cf91d6bSwdenk - CFG_I2C_EEPROM_ADDR_OVERFLOW: 20525cf91d6bSwdenk EEPROM chips that implement "address overflow" are ones 20535cf91d6bSwdenk like Catalyst 24WC04/08/16 which has 9/10/11 bits of 20545cf91d6bSwdenk address and the extra bits end up in the "chip address" bit 20555cf91d6bSwdenk slots. This makes a 24WC08 (1Kbyte) chip look like four 256 20565cf91d6bSwdenk byte chips. 20575cf91d6bSwdenk 20585cf91d6bSwdenk Note that we consider the length of the address field to 20595cf91d6bSwdenk still be one byte because the extra address bits are hidden 20605cf91d6bSwdenk in the chip address. 20615cf91d6bSwdenk 2062c609719bSwdenk - CFG_EEPROM_SIZE: 2063c609719bSwdenk The size in bytes of the EEPROM device. 2064c609719bSwdenk 2065c609719bSwdenk 20665779d8d9Swdenk- CFG_ENV_IS_IN_DATAFLASH: 20675779d8d9Swdenk 20685779d8d9Swdenk Define this if you have a DataFlash memory device which you 20695779d8d9Swdenk want to use for the environment. 20705779d8d9Swdenk 20715779d8d9Swdenk - CFG_ENV_OFFSET: 20725779d8d9Swdenk - CFG_ENV_ADDR: 20735779d8d9Swdenk - CFG_ENV_SIZE: 20745779d8d9Swdenk 20755779d8d9Swdenk These three #defines specify the offset and size of the 20765779d8d9Swdenk environment area within the total memory of your DataFlash placed 20775779d8d9Swdenk at the specified address. 20785779d8d9Swdenk 207913a5695bSwdenk- CFG_ENV_IS_IN_NAND: 208013a5695bSwdenk 208113a5695bSwdenk Define this if you have a NAND device which you want to use 208213a5695bSwdenk for the environment. 208313a5695bSwdenk 208413a5695bSwdenk - CFG_ENV_OFFSET: 208513a5695bSwdenk - CFG_ENV_SIZE: 208613a5695bSwdenk 208713a5695bSwdenk These two #defines specify the offset and size of the environment 208813a5695bSwdenk area within the first NAND device. 20895779d8d9Swdenk 2090e443c944SMarkus Klotzbuecher - CFG_ENV_OFFSET_REDUND 2091e443c944SMarkus Klotzbuecher 2092e443c944SMarkus Klotzbuecher This setting describes a second storage area of CFG_ENV_SIZE 2093e443c944SMarkus Klotzbuecher size used to hold a redundant copy of the environment data, 2094e443c944SMarkus Klotzbuecher so that there is a valid backup copy in case there is a 2095e443c944SMarkus Klotzbuecher power failure during a "saveenv" operation. 2096e443c944SMarkus Klotzbuecher 2097e443c944SMarkus Klotzbuecher Note: CFG_ENV_OFFSET and CFG_ENV_OFFSET_REDUND must be aligned 2098e443c944SMarkus Klotzbuecher to a block boundary, and CFG_ENV_SIZE must be a multiple of 2099e443c944SMarkus Klotzbuecher the NAND devices block size. 2100e443c944SMarkus Klotzbuecher 2101c609719bSwdenk- CFG_SPI_INIT_OFFSET 2102c609719bSwdenk 2103c609719bSwdenk Defines offset to the initial SPI buffer area in DPRAM. The 2104c609719bSwdenk area is used at an early stage (ROM part) if the environment 2105c609719bSwdenk is configured to reside in the SPI EEPROM: We need a 520 byte 2106c609719bSwdenk scratch DPRAM area. It is used between the two initialization 2107c609719bSwdenk calls (spi_init_f() and spi_init_r()). A value of 0xB00 seems 2108c609719bSwdenk to be a good choice since it makes it far enough from the 2109c609719bSwdenk start of the data area as well as from the stack pointer. 2110c609719bSwdenk 2111c609719bSwdenkPlease note that the environment is read-only as long as the monitor 2112c609719bSwdenkhas been relocated to RAM and a RAM copy of the environment has been 2113c609719bSwdenkcreated; also, when using EEPROM you will have to use getenv_r() 2114c609719bSwdenkuntil then to read environment variables. 2115c609719bSwdenk 211685ec0bccSwdenkThe environment is protected by a CRC32 checksum. Before the monitor 211785ec0bccSwdenkis relocated into RAM, as a result of a bad CRC you will be working 211885ec0bccSwdenkwith the compiled-in default environment - *silently*!!! [This is 211985ec0bccSwdenknecessary, because the first environment variable we need is the 212085ec0bccSwdenk"baudrate" setting for the console - if we have a bad CRC, we don't 212185ec0bccSwdenkhave any device yet where we could complain.] 2122c609719bSwdenk 2123c609719bSwdenkNote: once the monitor has been relocated, then it will complain if 2124c609719bSwdenkthe default environment is used; a new CRC is computed as soon as you 212585ec0bccSwdenkuse the "saveenv" command to store a valid environment. 2126c609719bSwdenk 2127fc3e2165Swdenk- CFG_FAULT_ECHO_LINK_DOWN: 2128fc3e2165Swdenk Echo the inverted Ethernet link state to the fault LED. 2129fc3e2165Swdenk 2130fc3e2165Swdenk Note: If this option is active, then CFG_FAULT_MII_ADDR 2131fc3e2165Swdenk also needs to be defined. 2132fc3e2165Swdenk 2133fc3e2165Swdenk- CFG_FAULT_MII_ADDR: 2134fc3e2165Swdenk MII address of the PHY to check for the Ethernet link state. 2135c609719bSwdenk 2136c40b2956Swdenk- CFG_64BIT_VSPRINTF: 2137c40b2956Swdenk Makes vsprintf (and all *printf functions) support printing 2138c40b2956Swdenk of 64bit values by using the L quantifier 2139c40b2956Swdenk 2140c40b2956Swdenk- CFG_64BIT_STRTOUL: 2141c40b2956Swdenk Adds simple_strtoull that returns a 64bit value 2142c40b2956Swdenk 2143c609719bSwdenkLow Level (hardware related) configuration options: 2144dc7c9a1aSwdenk--------------------------------------------------- 2145c609719bSwdenk 2146c609719bSwdenk- CFG_CACHELINE_SIZE: 2147c609719bSwdenk Cache Line Size of the CPU. 2148c609719bSwdenk 2149c609719bSwdenk- CFG_DEFAULT_IMMR: 2150c609719bSwdenk Default address of the IMMR after system reset. 21512535d602Swdenk 21522535d602Swdenk Needed on some 8260 systems (MPC8260ADS, PQ2FADS-ZU, 21532535d602Swdenk and RPXsuper) to be able to adjust the position of 21542535d602Swdenk the IMMR register after a reset. 2155c609719bSwdenk 21567f6c2cbcSwdenk- Floppy Disk Support: 21577f6c2cbcSwdenk CFG_FDC_DRIVE_NUMBER 21587f6c2cbcSwdenk 21597f6c2cbcSwdenk the default drive number (default value 0) 21607f6c2cbcSwdenk 21617f6c2cbcSwdenk CFG_ISA_IO_STRIDE 21627f6c2cbcSwdenk 21637f6c2cbcSwdenk defines the spacing between fdc chipset registers 21647f6c2cbcSwdenk (default value 1) 21657f6c2cbcSwdenk 21667f6c2cbcSwdenk CFG_ISA_IO_OFFSET 21677f6c2cbcSwdenk 21687f6c2cbcSwdenk defines the offset of register from address. It 21697f6c2cbcSwdenk depends on which part of the data bus is connected to 21707f6c2cbcSwdenk the fdc chipset. (default value 0) 21717f6c2cbcSwdenk 21727f6c2cbcSwdenk If CFG_ISA_IO_STRIDE CFG_ISA_IO_OFFSET and 21737f6c2cbcSwdenk CFG_FDC_DRIVE_NUMBER are undefined, they take their 21747f6c2cbcSwdenk default value. 21757f6c2cbcSwdenk 21767f6c2cbcSwdenk if CFG_FDC_HW_INIT is defined, then the function 21777f6c2cbcSwdenk fdc_hw_init() is called at the beginning of the FDC 21787f6c2cbcSwdenk setup. fdc_hw_init() must be provided by the board 21797f6c2cbcSwdenk source code. It is used to make hardware dependant 21807f6c2cbcSwdenk initializations. 21817f6c2cbcSwdenk 218225d6712aSwdenk- CFG_IMMR: Physical address of the Internal Memory. 218325d6712aSwdenk DO NOT CHANGE unless you know exactly what you're 218425d6712aSwdenk doing! (11-4) [MPC8xx/82xx systems only] 2185c609719bSwdenk 2186c609719bSwdenk- CFG_INIT_RAM_ADDR: 2187c609719bSwdenk 21887152b1d0Swdenk Start address of memory area that can be used for 2189c609719bSwdenk initial data and stack; please note that this must be 2190c609719bSwdenk writable memory that is working WITHOUT special 2191c609719bSwdenk initialization, i. e. you CANNOT use normal RAM which 2192c609719bSwdenk will become available only after programming the 2193c609719bSwdenk memory controller and running certain initialization 2194c609719bSwdenk sequences. 2195c609719bSwdenk 2196c609719bSwdenk U-Boot uses the following memory types: 2197c609719bSwdenk - MPC8xx and MPC8260: IMMR (internal memory of the CPU) 2198c609719bSwdenk - MPC824X: data cache 2199c609719bSwdenk - PPC4xx: data cache 2200c609719bSwdenk 220185ec0bccSwdenk- CFG_GBL_DATA_OFFSET: 2202c609719bSwdenk 2203c609719bSwdenk Offset of the initial data structure in the memory 2204c609719bSwdenk area defined by CFG_INIT_RAM_ADDR. Usually 220585ec0bccSwdenk CFG_GBL_DATA_OFFSET is chosen such that the initial 2206c609719bSwdenk data is located at the end of the available space 2207c609719bSwdenk (sometimes written as (CFG_INIT_RAM_END - 2208c609719bSwdenk CFG_INIT_DATA_SIZE), and the initial stack is just 2209c609719bSwdenk below that area (growing from (CFG_INIT_RAM_ADDR + 221085ec0bccSwdenk CFG_GBL_DATA_OFFSET) downward. 2211c609719bSwdenk 2212c609719bSwdenk Note: 2213c609719bSwdenk On the MPC824X (or other systems that use the data 2214c609719bSwdenk cache for initial memory) the address chosen for 2215c609719bSwdenk CFG_INIT_RAM_ADDR is basically arbitrary - it must 2216c609719bSwdenk point to an otherwise UNUSED address space between 2217c609719bSwdenk the top of RAM and the start of the PCI space. 2218c609719bSwdenk 2219c609719bSwdenk- CFG_SIUMCR: SIU Module Configuration (11-6) 2220c609719bSwdenk 2221c609719bSwdenk- CFG_SYPCR: System Protection Control (11-9) 2222c609719bSwdenk 2223c609719bSwdenk- CFG_TBSCR: Time Base Status and Control (11-26) 2224c609719bSwdenk 2225c609719bSwdenk- CFG_PISCR: Periodic Interrupt Status and Control (11-31) 2226c609719bSwdenk 2227c609719bSwdenk- CFG_PLPRCR: PLL, Low-Power, and Reset Control Register (15-30) 2228c609719bSwdenk 2229c609719bSwdenk- CFG_SCCR: System Clock and reset Control Register (15-27) 2230c609719bSwdenk 2231c609719bSwdenk- CFG_OR_TIMING_SDRAM: 2232c609719bSwdenk SDRAM timing 2233c609719bSwdenk 2234c609719bSwdenk- CFG_MAMR_PTA: 2235c609719bSwdenk periodic timer for refresh 2236c609719bSwdenk 2237c609719bSwdenk- CFG_DER: Debug Event Register (37-47) 2238c609719bSwdenk 2239c609719bSwdenk- FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CFG_REMAP_OR_AM, 2240c609719bSwdenk CFG_PRELIM_OR_AM, CFG_OR_TIMING_FLASH, CFG_OR0_REMAP, 2241c609719bSwdenk CFG_OR0_PRELIM, CFG_BR0_PRELIM, CFG_OR1_REMAP, CFG_OR1_PRELIM, 2242c609719bSwdenk CFG_BR1_PRELIM: 2243c609719bSwdenk Memory Controller Definitions: BR0/1 and OR0/1 (FLASH) 2244c609719bSwdenk 2245c609719bSwdenk- SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE, 2246c609719bSwdenk CFG_OR_TIMING_SDRAM, CFG_OR2_PRELIM, CFG_BR2_PRELIM, 2247c609719bSwdenk CFG_OR3_PRELIM, CFG_BR3_PRELIM: 2248c609719bSwdenk Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM) 2249c609719bSwdenk 2250c609719bSwdenk- CFG_MAMR_PTA, CFG_MPTPR_2BK_4K, CFG_MPTPR_1BK_4K, CFG_MPTPR_2BK_8K, 2251c609719bSwdenk CFG_MPTPR_1BK_8K, CFG_MAMR_8COL, CFG_MAMR_9COL: 2252c609719bSwdenk Machine Mode Register and Memory Periodic Timer 2253c609719bSwdenk Prescaler definitions (SDRAM timing) 2254c609719bSwdenk 2255c609719bSwdenk- CFG_I2C_UCODE_PATCH, CFG_I2C_DPMEM_OFFSET [0x1FC0]: 2256c609719bSwdenk enable I2C microcode relocation patch (MPC8xx); 2257c609719bSwdenk define relocation offset in DPRAM [DSP2] 2258c609719bSwdenk 2259c609719bSwdenk- CFG_SPI_UCODE_PATCH, CFG_SPI_DPMEM_OFFSET [0x1FC0]: 2260c609719bSwdenk enable SPI microcode relocation patch (MPC8xx); 2261c609719bSwdenk define relocation offset in DPRAM [SCC4] 2262c609719bSwdenk 2263c609719bSwdenk- CFG_USE_OSCCLK: 2264c609719bSwdenk Use OSCM clock mode on MBX8xx board. Be careful, 2265c609719bSwdenk wrong setting might damage your board. Read 2266c609719bSwdenk doc/README.MBX before setting this variable! 2267c609719bSwdenk 2268ea909b76Swdenk- CFG_CPM_POST_WORD_ADDR: (MPC8xx, MPC8260 only) 2269ea909b76Swdenk Offset of the bootmode word in DPRAM used by post 2270ea909b76Swdenk (Power On Self Tests). This definition overrides 2271ea909b76Swdenk #define'd default value in commproc.h resp. 2272ea909b76Swdenk cpm_8260.h. 2273ea909b76Swdenk 22745d232d0eSwdenk- CFG_PCI_SLV_MEM_LOCAL, CFG_PCI_SLV_MEM_BUS, CFG_PICMR0_MASK_ATTRIB, 22755d232d0eSwdenk CFG_PCI_MSTR0_LOCAL, CFG_PCIMSK0_MASK, CFG_PCI_MSTR1_LOCAL, 22765d232d0eSwdenk CFG_PCIMSK1_MASK, CFG_PCI_MSTR_MEM_LOCAL, CFG_PCI_MSTR_MEM_BUS, 22775d232d0eSwdenk CFG_CPU_PCI_MEM_START, CFG_PCI_MSTR_MEM_SIZE, CFG_POCMR0_MASK_ATTRIB, 22785d232d0eSwdenk CFG_PCI_MSTR_MEMIO_LOCAL, CFG_PCI_MSTR_MEMIO_BUS, CPU_PCI_MEMIO_START, 22795d232d0eSwdenk CFG_PCI_MSTR_MEMIO_SIZE, CFG_POCMR1_MASK_ATTRIB, CFG_PCI_MSTR_IO_LOCAL, 22805d232d0eSwdenk CFG_PCI_MSTR_IO_BUS, CFG_CPU_PCI_IO_START, CFG_PCI_MSTR_IO_SIZE, 22815d232d0eSwdenk CFG_POCMR2_MASK_ATTRIB: (MPC826x only) 22825d232d0eSwdenk Overrides the default PCI memory map in cpu/mpc8260/pci.c if set. 22835d232d0eSwdenk 2284bb99ad6dSBen Warren- CONFIG_SPD_EEPROM 2285bb99ad6dSBen Warren Get DDR timing information from an I2C EEPROM. Common with pluggable 2286bb99ad6dSBen Warren memory modules such as SODIMMs 2287bb99ad6dSBen Warren SPD_EEPROM_ADDRESS 2288bb99ad6dSBen Warren I2C address of the SPD EEPROM 2289bb99ad6dSBen Warren 2290bb99ad6dSBen Warren- CFG_SPD_BUS_NUM 2291bb99ad6dSBen Warren If SPD EEPROM is on an I2C bus other than the first one, specify here. 2292bb99ad6dSBen Warren Note that the value must resolve to something your driver can deal with. 2293bb99ad6dSBen Warren 22942ad6b513STimur Tabi- CFG_83XX_DDR_USES_CS0 22952ad6b513STimur Tabi Only for 83xx systems. If specified, then DDR should be configured 22962ad6b513STimur Tabi using CS0 and CS1 instead of CS2 and CS3. 22972ad6b513STimur Tabi 22982ad6b513STimur Tabi- CFG_83XX_DDR_USES_CS0 22992ad6b513STimur Tabi Only for 83xx systems. If specified, then DDR should be configured 23002ad6b513STimur Tabi using CS0 and CS1 instead of CS2 and CS3. 23012ad6b513STimur Tabi 2302c26e454dSwdenk- CONFIG_ETHER_ON_FEC[12] 2303c26e454dSwdenk Define to enable FEC[12] on a 8xx series processor. 2304c26e454dSwdenk 2305c26e454dSwdenk- CONFIG_FEC[12]_PHY 2306c26e454dSwdenk Define to the hardcoded PHY address which corresponds 23076e592385Swdenk to the given FEC; i. e. 2308c26e454dSwdenk #define CONFIG_FEC1_PHY 4 2309c26e454dSwdenk means that the PHY with address 4 is connected to FEC1 2310c26e454dSwdenk 2311c26e454dSwdenk When set to -1, means to probe for first available. 2312c26e454dSwdenk 2313c26e454dSwdenk- CONFIG_FEC[12]_PHY_NORXERR 2314c26e454dSwdenk The PHY does not have a RXERR line (RMII only). 2315c26e454dSwdenk (so program the FEC to ignore it). 2316c26e454dSwdenk 2317c26e454dSwdenk- CONFIG_RMII 2318c26e454dSwdenk Enable RMII mode for all FECs. 2319c26e454dSwdenk Note that this is a global option, we can't 2320c26e454dSwdenk have one FEC in standard MII mode and another in RMII mode. 2321c26e454dSwdenk 23225cf91d6bSwdenk- CONFIG_CRC32_VERIFY 23235cf91d6bSwdenk Add a verify option to the crc32 command. 23245cf91d6bSwdenk The syntax is: 23255cf91d6bSwdenk 23265cf91d6bSwdenk => crc32 -v <address> <count> <crc32> 23275cf91d6bSwdenk 23285cf91d6bSwdenk Where address/count indicate a memory area 23295cf91d6bSwdenk and crc32 is the correct crc32 which the 23305cf91d6bSwdenk area should have. 23315cf91d6bSwdenk 233256523f12Swdenk- CONFIG_LOOPW 233356523f12Swdenk Add the "loopw" memory command. This only takes effect if 2334602ad3b3SJon Loeliger the memory commands are activated globally (CONFIG_CMD_MEM). 233556523f12Swdenk 23367b466641Sstroese- CONFIG_MX_CYCLIC 23377b466641Sstroese Add the "mdc" and "mwc" memory commands. These are cyclic 23387b466641Sstroese "md/mw" commands. 23397b466641Sstroese Examples: 23407b466641Sstroese 23417b466641Sstroese => mdc.b 10 4 500 23427b466641Sstroese This command will print 4 bytes (10,11,12,13) each 500 ms. 23437b466641Sstroese 23447b466641Sstroese => mwc.l 100 12345678 10 23457b466641Sstroese This command will write 12345678 to address 100 all 10 ms. 23467b466641Sstroese 23477b466641Sstroese This only takes effect if the memory commands are activated 2348602ad3b3SJon Loeliger globally (CONFIG_CMD_MEM). 23497b466641Sstroese 23508aa1a2d1Swdenk- CONFIG_SKIP_LOWLEVEL_INIT 23518aa1a2d1Swdenk- CONFIG_SKIP_RELOCATE_UBOOT 23528aa1a2d1Swdenk 23538aa1a2d1Swdenk [ARM only] If these variables are defined, then 23548aa1a2d1Swdenk certain low level initializations (like setting up 23558aa1a2d1Swdenk the memory controller) are omitted and/or U-Boot does 23568aa1a2d1Swdenk not relocate itself into RAM. 23578aa1a2d1Swdenk Normally these variables MUST NOT be defined. The 23588aa1a2d1Swdenk only exception is when U-Boot is loaded (to RAM) by 23598aa1a2d1Swdenk some other boot loader or by a debugger which 23608aa1a2d1Swdenk performs these intializations itself. 23618aa1a2d1Swdenk 2362400558b5Swdenk 2363c609719bSwdenkBuilding the Software: 2364c609719bSwdenk====================== 2365c609719bSwdenk 2366c609719bSwdenkBuilding U-Boot has been tested in native PPC environments (on a 2367c609719bSwdenkPowerBook G3 running LinuxPPC 2000) and in cross environments 2368c609719bSwdenk(running RedHat 6.x and 7.x Linux on x86, Solaris 2.6 on a SPARC, and 2369c609719bSwdenkNetBSD 1.5 on x86). 2370c609719bSwdenk 2371c609719bSwdenkIf you are not using a native PPC environment, it is assumed that you 2372c609719bSwdenkhave the GNU cross compiling tools available in your path and named 2373c609719bSwdenkwith a prefix of "powerpc-linux-". If this is not the case, (e.g. if 2374c609719bSwdenkyou are using Monta Vista's Hard Hat Linux CDK 1.2) you must change 2375c609719bSwdenkthe definition of CROSS_COMPILE in Makefile. For HHL on a 4xx CPU, 2376c609719bSwdenkchange it to: 2377c609719bSwdenk 2378c609719bSwdenk CROSS_COMPILE = ppc_4xx- 2379c609719bSwdenk 2380c609719bSwdenk 2381c609719bSwdenkU-Boot is intended to be simple to build. After installing the 2382c609719bSwdenksources you must configure U-Boot for one specific board type. This 2383c609719bSwdenkis done by typing: 2384c609719bSwdenk 2385c609719bSwdenk make NAME_config 2386c609719bSwdenk 2387c609719bSwdenkwhere "NAME_config" is the name of one of the existing 2388c609719bSwdenkconfigurations; the following names are supported: 2389c609719bSwdenk 23901eaeb58eSwdenk ADCIOP_config FPS860L_config omap730p2_config 23911eaeb58eSwdenk ADS860_config GEN860T_config pcu_e_config 2392983fda83Swdenk Alaska8220_config 23931eaeb58eSwdenk AR405_config GENIETV_config PIP405_config 23941eaeb58eSwdenk at91rm9200dk_config GTH_config QS823_config 23951eaeb58eSwdenk CANBT_config hermes_config QS850_config 23961eaeb58eSwdenk cmi_mpc5xx_config hymod_config QS860T_config 23971eaeb58eSwdenk cogent_common_config IP860_config RPXlite_config 2398e63c8ee3Swdenk cogent_mpc8260_config IVML24_config RPXlite_DW_config 2399e63c8ee3Swdenk cogent_mpc8xx_config IVMS8_config RPXsuper_config 2400e63c8ee3Swdenk CPCI405_config JSE_config rsdproto_config 2401e63c8ee3Swdenk CPCIISER4_config LANTEC_config Sandpoint8240_config 2402e63c8ee3Swdenk csb272_config lwmon_config sbc8260_config 2403466b7410Swdenk CU824_config MBX860T_config sbc8560_33_config 2404466b7410Swdenk DUET_ADS_config MBX_config sbc8560_66_config 24054c52783bSroy zang EBONY_config mpc7448hpc2_config SM850_config 24064c52783bSroy zang ELPT860_config MPC8260ADS_config SPD823TS_config 24074c52783bSroy zang ESTEEM192E_config MPC8540ADS_config stxgp3_config 24084c52783bSroy zang ETX094_config MPC8540EVAL_config SXNI855T_config 24094c52783bSroy zang FADS823_config NMPC8560ADS_config TQM823L_config 24104c52783bSroy zang FADS850SAR_config NETVIA_config TQM850L_config 24114c52783bSroy zang FADS860T_config omap1510inn_config TQM855L_config 24124c52783bSroy zang FPS850L_config omap1610h2_config TQM860L_config 24134c52783bSroy zang omap1610inn_config walnut_config 24144c52783bSroy zang omap5912osk_config Yukon8220_config 24154c52783bSroy zang omap2420h4_config ZPC1900_config 241654387ac9Swdenk 2417c609719bSwdenkNote: for some board special configuration names may exist; check if 2418c609719bSwdenk additional information is available from the board vendor; for 24192729af9dSwdenk instance, the TQM823L systems are available without (standard) 24202729af9dSwdenk or with LCD support. You can select such additional "features" 2421c609719bSwdenk when chosing the configuration, i. e. 2422c609719bSwdenk 24232729af9dSwdenk make TQM823L_config 24242729af9dSwdenk - will configure for a plain TQM823L, i. e. no LCD support 2425c609719bSwdenk 2426c609719bSwdenk make TQM823L_LCD_config 2427c609719bSwdenk - will configure for a TQM823L with U-Boot console on LCD 2428c609719bSwdenk 2429c609719bSwdenk etc. 2430c609719bSwdenk 2431c609719bSwdenk 2432c609719bSwdenkFinally, type "make all", and you should get some working U-Boot 24337152b1d0Swdenkimages ready for download to / installation on your system: 2434c609719bSwdenk 2435c609719bSwdenk- "u-boot.bin" is a raw binary image 2436c609719bSwdenk- "u-boot" is an image in ELF binary format 2437c609719bSwdenk- "u-boot.srec" is in Motorola S-Record format 2438c609719bSwdenk 2439baf31249SMarian BalakowiczBy default the build is performed locally and the objects are saved 2440baf31249SMarian Balakowiczin the source directory. One of the two methods can be used to change 2441baf31249SMarian Balakowiczthis behavior and build U-Boot to some external directory: 2442baf31249SMarian Balakowicz 2443baf31249SMarian Balakowicz1. Add O= to the make command line invocations: 2444baf31249SMarian Balakowicz 2445baf31249SMarian Balakowicz make O=/tmp/build distclean 2446baf31249SMarian Balakowicz make O=/tmp/build NAME_config 2447baf31249SMarian Balakowicz make O=/tmp/build all 2448baf31249SMarian Balakowicz 2449baf31249SMarian Balakowicz2. Set environment variable BUILD_DIR to point to the desired location: 2450baf31249SMarian Balakowicz 2451baf31249SMarian Balakowicz export BUILD_DIR=/tmp/build 2452baf31249SMarian Balakowicz make distclean 2453baf31249SMarian Balakowicz make NAME_config 2454baf31249SMarian Balakowicz make all 2455baf31249SMarian Balakowicz 2456baf31249SMarian BalakowiczNote that the command line "O=" setting overrides the BUILD_DIR environment 2457baf31249SMarian Balakowiczvariable. 2458baf31249SMarian Balakowicz 2459c609719bSwdenk 2460c609719bSwdenkPlease be aware that the Makefiles assume you are using GNU make, so 2461c609719bSwdenkfor instance on NetBSD you might need to use "gmake" instead of 2462c609719bSwdenknative "make". 2463c609719bSwdenk 2464c609719bSwdenk 2465c609719bSwdenkIf the system board that you have is not listed, then you will need 2466c609719bSwdenkto port U-Boot to your hardware platform. To do this, follow these 2467c609719bSwdenksteps: 2468c609719bSwdenk 2469c609719bSwdenk1. Add a new configuration option for your board to the toplevel 247085ec0bccSwdenk "Makefile" and to the "MAKEALL" script, using the existing 247185ec0bccSwdenk entries as examples. Note that here and at many other places 24727152b1d0Swdenk boards and other names are listed in alphabetical sort order. Please 247385ec0bccSwdenk keep this order. 2474c609719bSwdenk2. Create a new directory to hold your board specific code. Add any 247585ec0bccSwdenk files you need. In your board directory, you will need at least 247685ec0bccSwdenk the "Makefile", a "<board>.c", "flash.c" and "u-boot.lds". 247785ec0bccSwdenk3. Create a new configuration file "include/configs/<board>.h" for 247885ec0bccSwdenk your board 2479c609719bSwdenk3. If you're porting U-Boot to a new CPU, then also create a new 2480c609719bSwdenk directory to hold your CPU specific code. Add any files you need. 248185ec0bccSwdenk4. Run "make <board>_config" with your new name. 2482c609719bSwdenk5. Type "make", and you should get a working "u-boot.srec" file 2483c609719bSwdenk to be installed on your target system. 248485ec0bccSwdenk6. Debug and solve any problems that might arise. 2485c609719bSwdenk [Of course, this last step is much harder than it sounds.] 2486c609719bSwdenk 2487c609719bSwdenk 2488c609719bSwdenkTesting of U-Boot Modifications, Ports to New Hardware, etc.: 2489c609719bSwdenk============================================================== 2490c609719bSwdenk 2491c609719bSwdenkIf you have modified U-Boot sources (for instance added a new board 2492c609719bSwdenkor support for new devices, a new CPU, etc.) you are expected to 2493c609719bSwdenkprovide feedback to the other developers. The feedback normally takes 2494c609719bSwdenkthe form of a "patch", i. e. a context diff against a certain (latest 2495c609719bSwdenkofficial or latest in CVS) version of U-Boot sources. 2496c609719bSwdenk 2497c609719bSwdenkBut before you submit such a patch, please verify that your modifi- 2498c609719bSwdenkcation did not break existing code. At least make sure that *ALL* of 2499c609719bSwdenkthe supported boards compile WITHOUT ANY compiler warnings. To do so, 2500c609719bSwdenkjust run the "MAKEALL" script, which will configure and build U-Boot 2501c609719bSwdenkfor ALL supported system. Be warned, this will take a while. You can 25027152b1d0Swdenkselect which (cross) compiler to use by passing a `CROSS_COMPILE' 2503c609719bSwdenkenvironment variable to the script, i. e. to use the cross tools from 2504c609719bSwdenkMontaVista's Hard Hat Linux you can type 2505c609719bSwdenk 2506c609719bSwdenk CROSS_COMPILE=ppc_8xx- MAKEALL 2507c609719bSwdenk 2508c609719bSwdenkor to build on a native PowerPC system you can type 2509c609719bSwdenk 2510c609719bSwdenk CROSS_COMPILE=' ' MAKEALL 2511c609719bSwdenk 2512baf31249SMarian BalakowiczWhen using the MAKEALL script, the default behaviour is to build U-Boot 2513baf31249SMarian Balakowiczin the source directory. This location can be changed by setting the 2514baf31249SMarian BalakowiczBUILD_DIR environment variable. Also, for each target built, the MAKEALL 2515baf31249SMarian Balakowiczscript saves two log files (<target>.ERR and <target>.MAKEALL) in the 2516baf31249SMarian Balakowicz<source dir>/LOG directory. This default location can be changed by 2517baf31249SMarian Balakowiczsetting the MAKEALL_LOGDIR environment variable. For example: 2518baf31249SMarian Balakowicz 2519baf31249SMarian Balakowicz export BUILD_DIR=/tmp/build 2520baf31249SMarian Balakowicz export MAKEALL_LOGDIR=/tmp/log 2521baf31249SMarian Balakowicz CROSS_COMPILE=ppc_8xx- MAKEALL 2522baf31249SMarian Balakowicz 2523baf31249SMarian BalakowiczWith the above settings build objects are saved in the /tmp/build, log 2524baf31249SMarian Balakowiczfiles are saved in the /tmp/log and the source tree remains clean during 2525baf31249SMarian Balakowiczthe whole build process. 2526baf31249SMarian Balakowicz 2527baf31249SMarian Balakowicz 2528c609719bSwdenkSee also "U-Boot Porting Guide" below. 2529c609719bSwdenk 2530c609719bSwdenk 2531c609719bSwdenkMonitor Commands - Overview: 2532c609719bSwdenk============================ 2533c609719bSwdenk 2534c609719bSwdenkgo - start application at address 'addr' 2535c609719bSwdenkrun - run commands in an environment variable 2536c609719bSwdenkbootm - boot application image from memory 2537c609719bSwdenkbootp - boot image via network using BootP/TFTP protocol 2538c609719bSwdenktftpboot- boot image via network using TFTP protocol 2539c609719bSwdenk and env variables "ipaddr" and "serverip" 2540c609719bSwdenk (and eventually "gatewayip") 2541c609719bSwdenkrarpboot- boot image via network using RARP/TFTP protocol 2542c609719bSwdenkdiskboot- boot from IDE devicebootd - boot default, i.e., run 'bootcmd' 2543c609719bSwdenkloads - load S-Record file over serial line 2544c609719bSwdenkloadb - load binary file over serial line (kermit mode) 2545c609719bSwdenkmd - memory display 2546c609719bSwdenkmm - memory modify (auto-incrementing) 2547c609719bSwdenknm - memory modify (constant address) 2548c609719bSwdenkmw - memory write (fill) 2549c609719bSwdenkcp - memory copy 2550c609719bSwdenkcmp - memory compare 2551c609719bSwdenkcrc32 - checksum calculation 2552c609719bSwdenkimd - i2c memory display 2553c609719bSwdenkimm - i2c memory modify (auto-incrementing) 2554c609719bSwdenkinm - i2c memory modify (constant address) 2555c609719bSwdenkimw - i2c memory write (fill) 2556c609719bSwdenkicrc32 - i2c checksum calculation 2557c609719bSwdenkiprobe - probe to discover valid I2C chip addresses 2558c609719bSwdenkiloop - infinite loop on address range 2559c609719bSwdenkisdram - print SDRAM configuration information 2560c609719bSwdenksspi - SPI utility commands 2561c609719bSwdenkbase - print or set address offset 2562c609719bSwdenkprintenv- print environment variables 2563c609719bSwdenksetenv - set environment variables 2564c609719bSwdenksaveenv - save environment variables to persistent storage 2565c609719bSwdenkprotect - enable or disable FLASH write protection 2566c609719bSwdenkerase - erase FLASH memory 2567c609719bSwdenkflinfo - print FLASH memory information 2568c609719bSwdenkbdinfo - print Board Info structure 2569c609719bSwdenkiminfo - print header information for application image 2570c609719bSwdenkconinfo - print console devices and informations 2571c609719bSwdenkide - IDE sub-system 2572c609719bSwdenkloop - infinite loop on address range 257356523f12Swdenkloopw - infinite write loop on address range 2574c609719bSwdenkmtest - simple RAM test 2575c609719bSwdenkicache - enable or disable instruction cache 2576c609719bSwdenkdcache - enable or disable data cache 2577c609719bSwdenkreset - Perform RESET of the CPU 2578c609719bSwdenkecho - echo args to console 2579c609719bSwdenkversion - print monitor version 2580c609719bSwdenkhelp - print online help 2581c609719bSwdenk? - alias for 'help' 2582c609719bSwdenk 2583c609719bSwdenk 2584c609719bSwdenkMonitor Commands - Detailed Description: 2585c609719bSwdenk======================================== 2586c609719bSwdenk 2587c609719bSwdenkTODO. 2588c609719bSwdenk 2589c609719bSwdenkFor now: just type "help <command>". 2590c609719bSwdenk 2591c609719bSwdenk 2592c609719bSwdenkEnvironment Variables: 2593c609719bSwdenk====================== 2594c609719bSwdenk 2595c609719bSwdenkU-Boot supports user configuration using Environment Variables which 2596c609719bSwdenkcan be made persistent by saving to Flash memory. 2597c609719bSwdenk 2598c609719bSwdenkEnvironment Variables are set using "setenv", printed using 2599c609719bSwdenk"printenv", and saved to Flash using "saveenv". Using "setenv" 2600c609719bSwdenkwithout a value can be used to delete a variable from the 2601c609719bSwdenkenvironment. As long as you don't save the environment you are 2602c609719bSwdenkworking with an in-memory copy. In case the Flash area containing the 2603c609719bSwdenkenvironment is erased by accident, a default environment is provided. 2604c609719bSwdenk 2605c609719bSwdenkSome configuration options can be set using Environment Variables: 2606c609719bSwdenk 2607c609719bSwdenk baudrate - see CONFIG_BAUDRATE 2608c609719bSwdenk 2609c609719bSwdenk bootdelay - see CONFIG_BOOTDELAY 2610c609719bSwdenk 2611c609719bSwdenk bootcmd - see CONFIG_BOOTCOMMAND 2612c609719bSwdenk 2613c609719bSwdenk bootargs - Boot arguments when booting an RTOS image 2614c609719bSwdenk 2615c609719bSwdenk bootfile - Name of the image to load with TFTP 2616c609719bSwdenk 2617c609719bSwdenk autoload - if set to "no" (any string beginning with 'n'), 2618c609719bSwdenk "bootp" will just load perform a lookup of the 2619c609719bSwdenk configuration from the BOOTP server, but not try to 2620c609719bSwdenk load any image using TFTP 2621c609719bSwdenk 2622c609719bSwdenk autostart - if set to "yes", an image loaded using the "bootp", 2623c609719bSwdenk "rarpboot", "tftpboot" or "diskboot" commands will 2624c609719bSwdenk be automatically started (by internally calling 2625c609719bSwdenk "bootm") 2626c609719bSwdenk 26274a6fd34bSwdenk If set to "no", a standalone image passed to the 26284a6fd34bSwdenk "bootm" command will be copied to the load address 26294a6fd34bSwdenk (and eventually uncompressed), but NOT be started. 26304a6fd34bSwdenk This can be used to load and uncompress arbitrary 26314a6fd34bSwdenk data. 26324a6fd34bSwdenk 263317ea1177Swdenk i2cfast - (PPC405GP|PPC405EP only) 263417ea1177Swdenk if set to 'y' configures Linux I2C driver for fast 263517ea1177Swdenk mode (400kHZ). This environment variable is used in 263617ea1177Swdenk initialization code. So, for changes to be effective 263717ea1177Swdenk it must be saved and board must be reset. 263817ea1177Swdenk 2639c609719bSwdenk initrd_high - restrict positioning of initrd images: 2640c609719bSwdenk If this variable is not set, initrd images will be 2641c609719bSwdenk copied to the highest possible address in RAM; this 2642c609719bSwdenk is usually what you want since it allows for 2643c609719bSwdenk maximum initrd size. If for some reason you want to 2644c609719bSwdenk make sure that the initrd image is loaded below the 2645c609719bSwdenk CFG_BOOTMAPSZ limit, you can set this environment 2646c609719bSwdenk variable to a value of "no" or "off" or "0". 2647c609719bSwdenk Alternatively, you can set it to a maximum upper 2648c609719bSwdenk address to use (U-Boot will still check that it 2649c609719bSwdenk does not overwrite the U-Boot stack and data). 2650c609719bSwdenk 2651c609719bSwdenk For instance, when you have a system with 16 MB 26527152b1d0Swdenk RAM, and want to reserve 4 MB from use by Linux, 2653c609719bSwdenk you can do this by adding "mem=12M" to the value of 2654c609719bSwdenk the "bootargs" variable. However, now you must make 26557152b1d0Swdenk sure that the initrd image is placed in the first 2656c609719bSwdenk 12 MB as well - this can be done with 2657c609719bSwdenk 2658c609719bSwdenk setenv initrd_high 00c00000 2659c609719bSwdenk 266038b99261Swdenk If you set initrd_high to 0xFFFFFFFF, this is an 266138b99261Swdenk indication to U-Boot that all addresses are legal 266238b99261Swdenk for the Linux kernel, including addresses in flash 266338b99261Swdenk memory. In this case U-Boot will NOT COPY the 266438b99261Swdenk ramdisk at all. This may be useful to reduce the 266538b99261Swdenk boot time on your system, but requires that this 266638b99261Swdenk feature is supported by your Linux kernel. 266738b99261Swdenk 2668c609719bSwdenk ipaddr - IP address; needed for tftpboot command 2669c609719bSwdenk 2670c609719bSwdenk loadaddr - Default load address for commands like "bootp", 2671dc7c9a1aSwdenk "rarpboot", "tftpboot", "loadb" or "diskboot" 2672c609719bSwdenk 2673c609719bSwdenk loads_echo - see CONFIG_LOADS_ECHO 2674c609719bSwdenk 2675c609719bSwdenk serverip - TFTP server IP address; needed for tftpboot command 2676c609719bSwdenk 2677c609719bSwdenk bootretry - see CONFIG_BOOT_RETRY_TIME 2678c609719bSwdenk 2679c609719bSwdenk bootdelaykey - see CONFIG_AUTOBOOT_DELAY_STR 2680c609719bSwdenk 2681c609719bSwdenk bootstopkey - see CONFIG_AUTOBOOT_STOP_STR 2682c609719bSwdenk 2683a3d991bdSwdenk ethprime - When CONFIG_NET_MULTI is enabled controls which 2684a3d991bdSwdenk interface is used first. 2685a3d991bdSwdenk 2686a3d991bdSwdenk ethact - When CONFIG_NET_MULTI is enabled controls which 2687a3d991bdSwdenk interface is currently active. For example you 2688a3d991bdSwdenk can do the following 2689a3d991bdSwdenk 2690a3d991bdSwdenk => setenv ethact FEC ETHERNET 2691a3d991bdSwdenk => ping 192.168.0.1 # traffic sent on FEC ETHERNET 2692a3d991bdSwdenk => setenv ethact SCC ETHERNET 2693a3d991bdSwdenk => ping 10.0.0.1 # traffic sent on SCC ETHERNET 2694a3d991bdSwdenk 2695a3d991bdSwdenk netretry - When set to "no" each network operation will 2696a3d991bdSwdenk either succeed or fail without retrying. 26976e592385Swdenk When set to "once" the network operation will 26986e592385Swdenk fail when all the available network interfaces 26996e592385Swdenk are tried once without success. 2700a3d991bdSwdenk Useful on scripts which control the retry operation 2701a3d991bdSwdenk themselves. 2702a3d991bdSwdenk 270328cb9375SWolfgang Denk tftpsrcport - If this is set, the value is used for TFTP's 2704ecb0ccd9SWolfgang Denk UDP source port. 2705ecb0ccd9SWolfgang Denk 270628cb9375SWolfgang Denk tftpdstport - If this is set, the value is used for TFTP's UDP 270728cb9375SWolfgang Denk destination port instead of the Well Know Port 69. 270828cb9375SWolfgang Denk 2709a3d991bdSwdenk vlan - When set to a value < 4095 the traffic over 2710a3d991bdSwdenk ethernet is encapsulated/received over 802.1q 2711a3d991bdSwdenk VLAN tagged frames. 2712c609719bSwdenk 2713c609719bSwdenkThe following environment variables may be used and automatically 2714c609719bSwdenkupdated by the network boot commands ("bootp" and "rarpboot"), 2715c609719bSwdenkdepending the information provided by your boot server: 2716c609719bSwdenk 2717c609719bSwdenk bootfile - see above 2718c609719bSwdenk dnsip - IP address of your Domain Name Server 2719fe389a82Sstroese dnsip2 - IP address of your secondary Domain Name Server 2720c609719bSwdenk gatewayip - IP address of the Gateway (Router) to use 2721c609719bSwdenk hostname - Target hostname 2722c609719bSwdenk ipaddr - see above 2723c609719bSwdenk netmask - Subnet Mask 2724c609719bSwdenk rootpath - Pathname of the root filesystem on the NFS server 2725c609719bSwdenk serverip - see above 2726c609719bSwdenk 2727c609719bSwdenk 2728c609719bSwdenkThere are two special Environment Variables: 2729c609719bSwdenk 2730c609719bSwdenk serial# - contains hardware identification information such 2731c609719bSwdenk as type string and/or serial number 2732c609719bSwdenk ethaddr - Ethernet address 2733c609719bSwdenk 2734c609719bSwdenkThese variables can be set only once (usually during manufacturing of 2735c609719bSwdenkthe board). U-Boot refuses to delete or overwrite these variables 2736c609719bSwdenkonce they have been set once. 2737c609719bSwdenk 2738c609719bSwdenk 2739c1551ea8SstroeseFurther special Environment Variables: 2740c1551ea8Sstroese 2741c1551ea8Sstroese ver - Contains the U-Boot version string as printed 2742c1551ea8Sstroese with the "version" command. This variable is 2743c1551ea8Sstroese readonly (see CONFIG_VERSION_VARIABLE). 2744c1551ea8Sstroese 2745c1551ea8Sstroese 2746c609719bSwdenkPlease note that changes to some configuration parameters may take 2747c609719bSwdenkonly effect after the next boot (yes, that's just like Windoze :-). 2748c609719bSwdenk 2749c609719bSwdenk 2750f07771ccSwdenkCommand Line Parsing: 2751f07771ccSwdenk===================== 2752f07771ccSwdenk 2753f07771ccSwdenkThere are two different command line parsers available with U-Boot: 27547152b1d0Swdenkthe old "simple" one, and the much more powerful "hush" shell: 2755f07771ccSwdenk 2756f07771ccSwdenkOld, simple command line parser: 2757f07771ccSwdenk-------------------------------- 2758f07771ccSwdenk 2759f07771ccSwdenk- supports environment variables (through setenv / saveenv commands) 2760f07771ccSwdenk- several commands on one line, separated by ';' 2761fe126d8bSWolfgang Denk- variable substitution using "... ${name} ..." syntax 2762f07771ccSwdenk- special characters ('$', ';') can be escaped by prefixing with '\', 2763f07771ccSwdenk for example: 2764fe126d8bSWolfgang Denk setenv bootcmd bootm \${address} 2765f07771ccSwdenk- You can also escape text by enclosing in single apostrophes, for example: 2766f07771ccSwdenk setenv addip 'setenv bootargs $bootargs ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname::off' 2767f07771ccSwdenk 2768f07771ccSwdenkHush shell: 2769f07771ccSwdenk----------- 2770f07771ccSwdenk 2771f07771ccSwdenk- similar to Bourne shell, with control structures like 2772f07771ccSwdenk if...then...else...fi, for...do...done; while...do...done, 2773f07771ccSwdenk until...do...done, ... 2774f07771ccSwdenk- supports environment ("global") variables (through setenv / saveenv 2775f07771ccSwdenk commands) and local shell variables (through standard shell syntax 2776f07771ccSwdenk "name=value"); only environment variables can be used with "run" 2777f07771ccSwdenk command 2778f07771ccSwdenk 2779f07771ccSwdenkGeneral rules: 2780f07771ccSwdenk-------------- 2781f07771ccSwdenk 2782f07771ccSwdenk(1) If a command line (or an environment variable executed by a "run" 2783f07771ccSwdenk command) contains several commands separated by semicolon, and 2784f07771ccSwdenk one of these commands fails, then the remaining commands will be 2785f07771ccSwdenk executed anyway. 2786f07771ccSwdenk 2787f07771ccSwdenk(2) If you execute several variables with one call to run (i. e. 2788f07771ccSwdenk calling run with a list af variables as arguments), any failing 2789f07771ccSwdenk command will cause "run" to terminate, i. e. the remaining 2790f07771ccSwdenk variables are not executed. 2791f07771ccSwdenk 2792c609719bSwdenkNote for Redundant Ethernet Interfaces: 2793c609719bSwdenk======================================= 2794c609719bSwdenk 27957152b1d0SwdenkSome boards come with redundant ethernet interfaces; U-Boot supports 2796c609719bSwdenksuch configurations and is capable of automatic selection of a 27977152b1d0Swdenk"working" interface when needed. MAC assignment works as follows: 2798c609719bSwdenk 2799c609719bSwdenkNetwork interfaces are numbered eth0, eth1, eth2, ... Corresponding 2800c609719bSwdenkMAC addresses can be stored in the environment as "ethaddr" (=>eth0), 2801c609719bSwdenk"eth1addr" (=>eth1), "eth2addr", ... 2802c609719bSwdenk 2803c609719bSwdenkIf the network interface stores some valid MAC address (for instance 2804c609719bSwdenkin SROM), this is used as default address if there is NO correspon- 2805c609719bSwdenkding setting in the environment; if the corresponding environment 2806c609719bSwdenkvariable is set, this overrides the settings in the card; that means: 2807c609719bSwdenk 2808c609719bSwdenko If the SROM has a valid MAC address, and there is no address in the 2809c609719bSwdenk environment, the SROM's address is used. 2810c609719bSwdenk 2811c609719bSwdenko If there is no valid address in the SROM, and a definition in the 2812c609719bSwdenk environment exists, then the value from the environment variable is 2813c609719bSwdenk used. 2814c609719bSwdenk 2815c609719bSwdenko If both the SROM and the environment contain a MAC address, and 2816c609719bSwdenk both addresses are the same, this MAC address is used. 2817c609719bSwdenk 2818c609719bSwdenko If both the SROM and the environment contain a MAC address, and the 2819c609719bSwdenk addresses differ, the value from the environment is used and a 2820c609719bSwdenk warning is printed. 2821c609719bSwdenk 2822c609719bSwdenko If neither SROM nor the environment contain a MAC address, an error 2823c609719bSwdenk is raised. 2824c609719bSwdenk 2825c609719bSwdenk 2826c609719bSwdenkImage Formats: 2827c609719bSwdenk============== 2828c609719bSwdenk 2829c609719bSwdenkThe "boot" commands of this monitor operate on "image" files which 2830c609719bSwdenkcan be basicly anything, preceeded by a special header; see the 2831c609719bSwdenkdefinitions in include/image.h for details; basicly, the header 2832c609719bSwdenkdefines the following image properties: 2833c609719bSwdenk 2834c609719bSwdenk* Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD, 2835c609719bSwdenk 4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks, 28367f70e853Swdenk LynxOS, pSOS, QNX, RTEMS, ARTOS; 28371f4bb37dSwdenk Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, ARTOS, LynxOS). 28387b64fef3SWolfgang Denk* Target CPU Architecture (Provisions for Alpha, ARM, AVR32, Intel x86, 28393d1e8a9dSwdenk IA64, MIPS, NIOS, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit; 28407b64fef3SWolfgang Denk Currently supported: ARM, AVR32, Intel x86, MIPS, NIOS, PowerPC). 2841c29fdfc1Swdenk* Compression Type (uncompressed, gzip, bzip2) 2842c609719bSwdenk* Load Address 2843c609719bSwdenk* Entry Point 2844c609719bSwdenk* Image Name 2845c609719bSwdenk* Image Timestamp 2846c609719bSwdenk 2847c609719bSwdenkThe header is marked by a special Magic Number, and both the header 2848c609719bSwdenkand the data portions of the image are secured against corruption by 2849c609719bSwdenkCRC32 checksums. 2850c609719bSwdenk 2851c609719bSwdenk 2852c609719bSwdenkLinux Support: 2853c609719bSwdenk============== 2854c609719bSwdenk 2855c609719bSwdenkAlthough U-Boot should support any OS or standalone application 28567152b1d0Swdenkeasily, the main focus has always been on Linux during the design of 2857c609719bSwdenkU-Boot. 2858c609719bSwdenk 2859c609719bSwdenkU-Boot includes many features that so far have been part of some 2860c609719bSwdenkspecial "boot loader" code within the Linux kernel. Also, any 2861c609719bSwdenk"initrd" images to be used are no longer part of one big Linux image; 2862c609719bSwdenkinstead, kernel and "initrd" are separate images. This implementation 28637152b1d0Swdenkserves several purposes: 2864c609719bSwdenk 2865c609719bSwdenk- the same features can be used for other OS or standalone 2866c609719bSwdenk applications (for instance: using compressed images to reduce the 2867c609719bSwdenk Flash memory footprint) 2868c609719bSwdenk 2869c609719bSwdenk- it becomes much easier to port new Linux kernel versions because 28707152b1d0Swdenk lots of low-level, hardware dependent stuff are done by U-Boot 2871c609719bSwdenk 2872c609719bSwdenk- the same Linux kernel image can now be used with different "initrd" 2873c609719bSwdenk images; of course this also means that different kernel images can 2874c609719bSwdenk be run with the same "initrd". This makes testing easier (you don't 2875c609719bSwdenk have to build a new "zImage.initrd" Linux image when you just 2876c609719bSwdenk change a file in your "initrd"). Also, a field-upgrade of the 2877c609719bSwdenk software is easier now. 2878c609719bSwdenk 2879c609719bSwdenk 2880c609719bSwdenkLinux HOWTO: 2881c609719bSwdenk============ 2882c609719bSwdenk 2883c609719bSwdenkPorting Linux to U-Boot based systems: 2884c609719bSwdenk--------------------------------------- 2885c609719bSwdenk 2886c609719bSwdenkU-Boot cannot save you from doing all the necessary modifications to 2887c609719bSwdenkconfigure the Linux device drivers for use with your target hardware 2888c609719bSwdenk(no, we don't intend to provide a full virtual machine interface to 2889c609719bSwdenkLinux :-). 2890c609719bSwdenk 2891c609719bSwdenkBut now you can ignore ALL boot loader code (in arch/ppc/mbxboot). 2892c609719bSwdenk 2893c609719bSwdenkJust make sure your machine specific header file (for instance 2894c609719bSwdenkinclude/asm-ppc/tqm8xx.h) includes the same definition of the Board 2895c609719bSwdenkInformation structure as we define in include/u-boot.h, and make 2896c609719bSwdenksure that your definition of IMAP_ADDR uses the same value as your 2897c609719bSwdenkU-Boot configuration in CFG_IMMR. 2898c609719bSwdenk 2899c609719bSwdenk 2900c609719bSwdenkConfiguring the Linux kernel: 2901c609719bSwdenk----------------------------- 2902c609719bSwdenk 2903c609719bSwdenkNo specific requirements for U-Boot. Make sure you have some root 2904c609719bSwdenkdevice (initial ramdisk, NFS) for your target system. 2905c609719bSwdenk 2906c609719bSwdenk 2907c609719bSwdenkBuilding a Linux Image: 2908c609719bSwdenk----------------------- 2909c609719bSwdenk 291024ee89b9SwdenkWith U-Boot, "normal" build targets like "zImage" or "bzImage" are 291124ee89b9Swdenknot used. If you use recent kernel source, a new build target 291224ee89b9Swdenk"uImage" will exist which automatically builds an image usable by 291324ee89b9SwdenkU-Boot. Most older kernels also have support for a "pImage" target, 291424ee89b9Swdenkwhich was introduced for our predecessor project PPCBoot and uses a 291524ee89b9Swdenk100% compatible format. 2916c609719bSwdenk 2917c609719bSwdenkExample: 2918c609719bSwdenk 2919c609719bSwdenk make TQM850L_config 2920c609719bSwdenk make oldconfig 2921c609719bSwdenk make dep 292224ee89b9Swdenk make uImage 2923c609719bSwdenk 292424ee89b9SwdenkThe "uImage" build target uses a special tool (in 'tools/mkimage') to 292524ee89b9Swdenkencapsulate a compressed Linux kernel image with header information, 292624ee89b9SwdenkCRC32 checksum etc. for use with U-Boot. This is what we are doing: 2927c609719bSwdenk 292824ee89b9Swdenk* build a standard "vmlinux" kernel image (in ELF binary format): 292924ee89b9Swdenk 293024ee89b9Swdenk* convert the kernel into a raw binary image: 293124ee89b9Swdenk 293224ee89b9Swdenk ${CROSS_COMPILE}-objcopy -O binary \ 293324ee89b9Swdenk -R .note -R .comment \ 293424ee89b9Swdenk -S vmlinux linux.bin 293524ee89b9Swdenk 293624ee89b9Swdenk* compress the binary image: 293724ee89b9Swdenk 293824ee89b9Swdenk gzip -9 linux.bin 293924ee89b9Swdenk 294024ee89b9Swdenk* package compressed binary image for U-Boot: 294124ee89b9Swdenk 294224ee89b9Swdenk mkimage -A ppc -O linux -T kernel -C gzip \ 294324ee89b9Swdenk -a 0 -e 0 -n "Linux Kernel Image" \ 294424ee89b9Swdenk -d linux.bin.gz uImage 294524ee89b9Swdenk 294624ee89b9Swdenk 294724ee89b9SwdenkThe "mkimage" tool can also be used to create ramdisk images for use 294824ee89b9Swdenkwith U-Boot, either separated from the Linux kernel image, or 294924ee89b9Swdenkcombined into one file. "mkimage" encapsulates the images with a 64 295024ee89b9Swdenkbyte header containing information about target architecture, 295124ee89b9Swdenkoperating system, image type, compression method, entry points, time 295224ee89b9Swdenkstamp, CRC32 checksums, etc. 295324ee89b9Swdenk 295424ee89b9Swdenk"mkimage" can be called in two ways: to verify existing images and 295524ee89b9Swdenkprint the header information, or to build new images. 2956c609719bSwdenk 2957c609719bSwdenkIn the first form (with "-l" option) mkimage lists the information 2958c609719bSwdenkcontained in the header of an existing U-Boot image; this includes 2959c609719bSwdenkchecksum verification: 2960c609719bSwdenk 2961c609719bSwdenk tools/mkimage -l image 2962c609719bSwdenk -l ==> list image header information 2963c609719bSwdenk 2964c609719bSwdenkThe second form (with "-d" option) is used to build a U-Boot image 2965c609719bSwdenkfrom a "data file" which is used as image payload: 2966c609719bSwdenk 2967c609719bSwdenk tools/mkimage -A arch -O os -T type -C comp -a addr -e ep \ 2968c609719bSwdenk -n name -d data_file image 2969c609719bSwdenk -A ==> set architecture to 'arch' 2970c609719bSwdenk -O ==> set operating system to 'os' 2971c609719bSwdenk -T ==> set image type to 'type' 2972c609719bSwdenk -C ==> set compression type 'comp' 2973c609719bSwdenk -a ==> set load address to 'addr' (hex) 2974c609719bSwdenk -e ==> set entry point to 'ep' (hex) 2975c609719bSwdenk -n ==> set image name to 'name' 2976c609719bSwdenk -d ==> use image data from 'datafile' 2977c609719bSwdenk 297869459791SwdenkRight now, all Linux kernels for PowerPC systems use the same load 297969459791Swdenkaddress (0x00000000), but the entry point address depends on the 298069459791Swdenkkernel version: 2981c609719bSwdenk 2982c609719bSwdenk- 2.2.x kernels have the entry point at 0x0000000C, 298324ee89b9Swdenk- 2.3.x and later kernels have the entry point at 0x00000000. 2984c609719bSwdenk 2985c609719bSwdenkSo a typical call to build a U-Boot image would read: 2986c609719bSwdenk 298724ee89b9Swdenk -> tools/mkimage -n '2.4.4 kernel for TQM850L' \ 298824ee89b9Swdenk > -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \ 298924ee89b9Swdenk > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/ppc/coffboot/vmlinux.gz \ 299024ee89b9Swdenk > examples/uImage.TQM850L 299124ee89b9Swdenk Image Name: 2.4.4 kernel for TQM850L 2992c609719bSwdenk Created: Wed Jul 19 02:34:59 2000 2993c609719bSwdenk Image Type: PowerPC Linux Kernel Image (gzip compressed) 2994c609719bSwdenk Data Size: 335725 Bytes = 327.86 kB = 0.32 MB 2995c609719bSwdenk Load Address: 0x00000000 299624ee89b9Swdenk Entry Point: 0x00000000 2997c609719bSwdenk 2998c609719bSwdenkTo verify the contents of the image (or check for corruption): 2999c609719bSwdenk 300024ee89b9Swdenk -> tools/mkimage -l examples/uImage.TQM850L 300124ee89b9Swdenk Image Name: 2.4.4 kernel for TQM850L 3002c609719bSwdenk Created: Wed Jul 19 02:34:59 2000 3003c609719bSwdenk Image Type: PowerPC Linux Kernel Image (gzip compressed) 3004c609719bSwdenk Data Size: 335725 Bytes = 327.86 kB = 0.32 MB 3005c609719bSwdenk Load Address: 0x00000000 300624ee89b9Swdenk Entry Point: 0x00000000 3007c609719bSwdenk 3008c609719bSwdenkNOTE: for embedded systems where boot time is critical you can trade 3009c609719bSwdenkspeed for memory and install an UNCOMPRESSED image instead: this 3010c609719bSwdenkneeds more space in Flash, but boots much faster since it does not 3011c609719bSwdenkneed to be uncompressed: 3012c609719bSwdenk 301324ee89b9Swdenk -> gunzip /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/ppc/coffboot/vmlinux.gz 301424ee89b9Swdenk -> tools/mkimage -n '2.4.4 kernel for TQM850L' \ 301524ee89b9Swdenk > -A ppc -O linux -T kernel -C none -a 0 -e 0 \ 301624ee89b9Swdenk > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/ppc/coffboot/vmlinux \ 301724ee89b9Swdenk > examples/uImage.TQM850L-uncompressed 301824ee89b9Swdenk Image Name: 2.4.4 kernel for TQM850L 3019c609719bSwdenk Created: Wed Jul 19 02:34:59 2000 3020c609719bSwdenk Image Type: PowerPC Linux Kernel Image (uncompressed) 3021c609719bSwdenk Data Size: 792160 Bytes = 773.59 kB = 0.76 MB 3022c609719bSwdenk Load Address: 0x00000000 302324ee89b9Swdenk Entry Point: 0x00000000 3024c609719bSwdenk 3025c609719bSwdenk 3026c609719bSwdenkSimilar you can build U-Boot images from a 'ramdisk.image.gz' file 3027c609719bSwdenkwhen your kernel is intended to use an initial ramdisk: 3028c609719bSwdenk 3029c609719bSwdenk -> tools/mkimage -n 'Simple Ramdisk Image' \ 3030c609719bSwdenk > -A ppc -O linux -T ramdisk -C gzip \ 3031c609719bSwdenk > -d /LinuxPPC/images/SIMPLE-ramdisk.image.gz examples/simple-initrd 3032c609719bSwdenk Image Name: Simple Ramdisk Image 3033c609719bSwdenk Created: Wed Jan 12 14:01:50 2000 3034c609719bSwdenk Image Type: PowerPC Linux RAMDisk Image (gzip compressed) 3035c609719bSwdenk Data Size: 566530 Bytes = 553.25 kB = 0.54 MB 3036c609719bSwdenk Load Address: 0x00000000 3037c609719bSwdenk Entry Point: 0x00000000 3038c609719bSwdenk 3039c609719bSwdenk 3040c609719bSwdenkInstalling a Linux Image: 3041c609719bSwdenk------------------------- 3042c609719bSwdenk 3043c609719bSwdenkTo downloading a U-Boot image over the serial (console) interface, 3044c609719bSwdenkyou must convert the image to S-Record format: 3045c609719bSwdenk 3046c609719bSwdenk objcopy -I binary -O srec examples/image examples/image.srec 3047c609719bSwdenk 3048c609719bSwdenkThe 'objcopy' does not understand the information in the U-Boot 3049c609719bSwdenkimage header, so the resulting S-Record file will be relative to 3050c609719bSwdenkaddress 0x00000000. To load it to a given address, you need to 3051c609719bSwdenkspecify the target address as 'offset' parameter with the 'loads' 3052c609719bSwdenkcommand. 3053c609719bSwdenk 3054c609719bSwdenkExample: install the image to address 0x40100000 (which on the 3055c609719bSwdenkTQM8xxL is in the first Flash bank): 3056c609719bSwdenk 3057c609719bSwdenk => erase 40100000 401FFFFF 3058c609719bSwdenk 3059c609719bSwdenk .......... done 3060c609719bSwdenk Erased 8 sectors 3061c609719bSwdenk 3062c609719bSwdenk => loads 40100000 3063c609719bSwdenk ## Ready for S-Record download ... 3064c609719bSwdenk ~>examples/image.srec 3065c609719bSwdenk 1 2 3 4 5 6 7 8 9 10 11 12 13 ... 3066c609719bSwdenk ... 3067c609719bSwdenk 15989 15990 15991 15992 3068c609719bSwdenk [file transfer complete] 3069c609719bSwdenk [connected] 3070c609719bSwdenk ## Start Addr = 0x00000000 3071c609719bSwdenk 3072c609719bSwdenk 3073c609719bSwdenkYou can check the success of the download using the 'iminfo' command; 3074c609719bSwdenkthis includes a checksum verification so you can be sure no data 3075c609719bSwdenkcorruption happened: 3076c609719bSwdenk 3077c609719bSwdenk => imi 40100000 3078c609719bSwdenk 3079c609719bSwdenk ## Checking Image at 40100000 ... 3080c609719bSwdenk Image Name: 2.2.13 for initrd on TQM850L 3081c609719bSwdenk Image Type: PowerPC Linux Kernel Image (gzip compressed) 3082c609719bSwdenk Data Size: 335725 Bytes = 327 kB = 0 MB 3083c609719bSwdenk Load Address: 00000000 3084c609719bSwdenk Entry Point: 0000000c 3085c609719bSwdenk Verifying Checksum ... OK 3086c609719bSwdenk 3087c609719bSwdenk 3088c609719bSwdenkBoot Linux: 3089c609719bSwdenk----------- 3090c609719bSwdenk 3091c609719bSwdenkThe "bootm" command is used to boot an application that is stored in 3092c609719bSwdenkmemory (RAM or Flash). In case of a Linux kernel image, the contents 3093c609719bSwdenkof the "bootargs" environment variable is passed to the kernel as 3094c609719bSwdenkparameters. You can check and modify this variable using the 3095c609719bSwdenk"printenv" and "setenv" commands: 3096c609719bSwdenk 3097c609719bSwdenk 3098c609719bSwdenk => printenv bootargs 3099c609719bSwdenk bootargs=root=/dev/ram 3100c609719bSwdenk 3101c609719bSwdenk => setenv bootargs root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2 3102c609719bSwdenk 3103c609719bSwdenk => printenv bootargs 3104c609719bSwdenk bootargs=root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2 3105c609719bSwdenk 3106c609719bSwdenk => bootm 40020000 3107c609719bSwdenk ## Booting Linux kernel at 40020000 ... 3108c609719bSwdenk Image Name: 2.2.13 for NFS on TQM850L 3109c609719bSwdenk Image Type: PowerPC Linux Kernel Image (gzip compressed) 3110c609719bSwdenk Data Size: 381681 Bytes = 372 kB = 0 MB 3111c609719bSwdenk Load Address: 00000000 3112c609719bSwdenk Entry Point: 0000000c 3113c609719bSwdenk Verifying Checksum ... OK 3114c609719bSwdenk Uncompressing Kernel Image ... OK 3115c609719bSwdenk 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 3116c609719bSwdenk Boot arguments: root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2 3117c609719bSwdenk time_init: decrementer frequency = 187500000/60 3118c609719bSwdenk Calibrating delay loop... 49.77 BogoMIPS 3119c609719bSwdenk Memory: 15208k available (700k kernel code, 444k data, 32k init) [c0000000,c1000000] 3120c609719bSwdenk ... 3121c609719bSwdenk 3122c609719bSwdenkIf you want to boot a Linux kernel with initial ram disk, you pass 31237152b1d0Swdenkthe memory addresses of both the kernel and the initrd image (PPBCOOT 3124c609719bSwdenkformat!) to the "bootm" command: 3125c609719bSwdenk 3126c609719bSwdenk => imi 40100000 40200000 3127c609719bSwdenk 3128c609719bSwdenk ## Checking Image at 40100000 ... 3129c609719bSwdenk Image Name: 2.2.13 for initrd on TQM850L 3130c609719bSwdenk Image Type: PowerPC Linux Kernel Image (gzip compressed) 3131c609719bSwdenk Data Size: 335725 Bytes = 327 kB = 0 MB 3132c609719bSwdenk Load Address: 00000000 3133c609719bSwdenk Entry Point: 0000000c 3134c609719bSwdenk Verifying Checksum ... OK 3135c609719bSwdenk 3136c609719bSwdenk ## Checking Image at 40200000 ... 3137c609719bSwdenk Image Name: Simple Ramdisk Image 3138c609719bSwdenk Image Type: PowerPC Linux RAMDisk Image (gzip compressed) 3139c609719bSwdenk Data Size: 566530 Bytes = 553 kB = 0 MB 3140c609719bSwdenk Load Address: 00000000 3141c609719bSwdenk Entry Point: 00000000 3142c609719bSwdenk Verifying Checksum ... OK 3143c609719bSwdenk 3144c609719bSwdenk => bootm 40100000 40200000 3145c609719bSwdenk ## Booting Linux kernel at 40100000 ... 3146c609719bSwdenk Image Name: 2.2.13 for initrd on TQM850L 3147c609719bSwdenk Image Type: PowerPC Linux Kernel Image (gzip compressed) 3148c609719bSwdenk Data Size: 335725 Bytes = 327 kB = 0 MB 3149c609719bSwdenk Load Address: 00000000 3150c609719bSwdenk Entry Point: 0000000c 3151c609719bSwdenk Verifying Checksum ... OK 3152c609719bSwdenk Uncompressing Kernel Image ... OK 3153c609719bSwdenk ## Loading RAMDisk Image at 40200000 ... 3154c609719bSwdenk Image Name: Simple Ramdisk Image 3155c609719bSwdenk Image Type: PowerPC Linux RAMDisk Image (gzip compressed) 3156c609719bSwdenk Data Size: 566530 Bytes = 553 kB = 0 MB 3157c609719bSwdenk Load Address: 00000000 3158c609719bSwdenk Entry Point: 00000000 3159c609719bSwdenk Verifying Checksum ... OK 3160c609719bSwdenk Loading Ramdisk ... OK 3161c609719bSwdenk 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 3162c609719bSwdenk Boot arguments: root=/dev/ram 3163c609719bSwdenk time_init: decrementer frequency = 187500000/60 3164c609719bSwdenk Calibrating delay loop... 49.77 BogoMIPS 3165c609719bSwdenk ... 3166c609719bSwdenk RAMDISK: Compressed image found at block 0 3167c609719bSwdenk VFS: Mounted root (ext2 filesystem). 3168c609719bSwdenk 3169c609719bSwdenk bash# 3170c609719bSwdenk 31710267768eSMatthew McClintockBoot Linux and pass a flat device tree: 31720267768eSMatthew McClintock----------- 31730267768eSMatthew McClintock 31740267768eSMatthew McClintockFirst, U-Boot must be compiled with the appropriate defines. See the section 31750267768eSMatthew McClintocktitled "Linux Kernel Interface" above for a more in depth explanation. The 31760267768eSMatthew McClintockfollowing is an example of how to start a kernel and pass an updated 31770267768eSMatthew McClintockflat device tree: 31780267768eSMatthew McClintock 31790267768eSMatthew McClintock=> print oftaddr 31800267768eSMatthew McClintockoftaddr=0x300000 31810267768eSMatthew McClintock=> print oft 31820267768eSMatthew McClintockoft=oftrees/mpc8540ads.dtb 31830267768eSMatthew McClintock=> tftp $oftaddr $oft 31840267768eSMatthew McClintockSpeed: 1000, full duplex 31850267768eSMatthew McClintockUsing TSEC0 device 31860267768eSMatthew McClintockTFTP from server 192.168.1.1; our IP address is 192.168.1.101 31870267768eSMatthew McClintockFilename 'oftrees/mpc8540ads.dtb'. 31880267768eSMatthew McClintockLoad address: 0x300000 31890267768eSMatthew McClintockLoading: # 31900267768eSMatthew McClintockdone 31910267768eSMatthew McClintockBytes transferred = 4106 (100a hex) 31920267768eSMatthew McClintock=> tftp $loadaddr $bootfile 31930267768eSMatthew McClintockSpeed: 1000, full duplex 31940267768eSMatthew McClintockUsing TSEC0 device 31950267768eSMatthew McClintockTFTP from server 192.168.1.1; our IP address is 192.168.1.2 31960267768eSMatthew McClintockFilename 'uImage'. 31970267768eSMatthew McClintockLoad address: 0x200000 31980267768eSMatthew McClintockLoading:############ 31990267768eSMatthew McClintockdone 32000267768eSMatthew McClintockBytes transferred = 1029407 (fb51f hex) 32010267768eSMatthew McClintock=> print loadaddr 32020267768eSMatthew McClintockloadaddr=200000 32030267768eSMatthew McClintock=> print oftaddr 32040267768eSMatthew McClintockoftaddr=0x300000 32050267768eSMatthew McClintock=> bootm $loadaddr - $oftaddr 32060267768eSMatthew McClintock## Booting image at 00200000 ... 32070267768eSMatthew McClintock Image Name: Linux-2.6.17-dirty 32080267768eSMatthew McClintock Image Type: PowerPC Linux Kernel Image (gzip compressed) 32090267768eSMatthew McClintock Data Size: 1029343 Bytes = 1005.2 kB 32100267768eSMatthew McClintock Load Address: 00000000 32110267768eSMatthew McClintock Entry Point: 00000000 32120267768eSMatthew McClintock Verifying Checksum ... OK 32130267768eSMatthew McClintock Uncompressing Kernel Image ... OK 32140267768eSMatthew McClintockBooting using flat device tree at 0x300000 32150267768eSMatthew McClintockUsing MPC85xx ADS machine description 32160267768eSMatthew McClintockMemory CAM mapping: CAM0=256Mb, CAM1=256Mb, CAM2=0Mb residual: 0Mb 32170267768eSMatthew McClintock[snip] 32180267768eSMatthew McClintock 32190267768eSMatthew McClintock 32206069ff26SwdenkMore About U-Boot Image Types: 32216069ff26Swdenk------------------------------ 32226069ff26Swdenk 32236069ff26SwdenkU-Boot supports the following image types: 32246069ff26Swdenk 32256069ff26Swdenk "Standalone Programs" are directly runnable in the environment 32266069ff26Swdenk provided by U-Boot; it is expected that (if they behave 32276069ff26Swdenk well) you can continue to work in U-Boot after return from 32286069ff26Swdenk the Standalone Program. 32296069ff26Swdenk "OS Kernel Images" are usually images of some Embedded OS which 32306069ff26Swdenk will take over control completely. Usually these programs 32316069ff26Swdenk will install their own set of exception handlers, device 32326069ff26Swdenk drivers, set up the MMU, etc. - this means, that you cannot 32336069ff26Swdenk expect to re-enter U-Boot except by resetting the CPU. 32346069ff26Swdenk "RAMDisk Images" are more or less just data blocks, and their 32356069ff26Swdenk parameters (address, size) are passed to an OS kernel that is 32366069ff26Swdenk being started. 32376069ff26Swdenk "Multi-File Images" contain several images, typically an OS 32386069ff26Swdenk (Linux) kernel image and one or more data images like 32396069ff26Swdenk RAMDisks. This construct is useful for instance when you want 32406069ff26Swdenk to boot over the network using BOOTP etc., where the boot 32416069ff26Swdenk server provides just a single image file, but you want to get 32426069ff26Swdenk for instance an OS kernel and a RAMDisk image. 32436069ff26Swdenk 32446069ff26Swdenk "Multi-File Images" start with a list of image sizes, each 32456069ff26Swdenk image size (in bytes) specified by an "uint32_t" in network 32466069ff26Swdenk byte order. This list is terminated by an "(uint32_t)0". 32476069ff26Swdenk Immediately after the terminating 0 follow the images, one by 32486069ff26Swdenk one, all aligned on "uint32_t" boundaries (size rounded up to 32496069ff26Swdenk a multiple of 4 bytes). 32506069ff26Swdenk 32516069ff26Swdenk "Firmware Images" are binary images containing firmware (like 32526069ff26Swdenk U-Boot or FPGA images) which usually will be programmed to 32536069ff26Swdenk flash memory. 32546069ff26Swdenk 32556069ff26Swdenk "Script files" are command sequences that will be executed by 32566069ff26Swdenk U-Boot's command interpreter; this feature is especially 32576069ff26Swdenk useful when you configure U-Boot to use a real shell (hush) 32586069ff26Swdenk as command interpreter. 32596069ff26Swdenk 3260c609719bSwdenk 3261c609719bSwdenkStandalone HOWTO: 3262c609719bSwdenk================= 3263c609719bSwdenk 3264c609719bSwdenkOne of the features of U-Boot is that you can dynamically load and 3265c609719bSwdenkrun "standalone" applications, which can use some resources of 3266c609719bSwdenkU-Boot like console I/O functions or interrupt services. 3267c609719bSwdenk 3268c609719bSwdenkTwo simple examples are included with the sources: 3269c609719bSwdenk 3270c609719bSwdenk"Hello World" Demo: 3271c609719bSwdenk------------------- 3272c609719bSwdenk 3273c609719bSwdenk'examples/hello_world.c' contains a small "Hello World" Demo 3274c609719bSwdenkapplication; it is automatically compiled when you build U-Boot. 3275c609719bSwdenkIt's configured to run at address 0x00040004, so you can play with it 3276c609719bSwdenklike that: 3277c609719bSwdenk 3278c609719bSwdenk => loads 3279c609719bSwdenk ## Ready for S-Record download ... 3280c609719bSwdenk ~>examples/hello_world.srec 3281c609719bSwdenk 1 2 3 4 5 6 7 8 9 10 11 ... 3282c609719bSwdenk [file transfer complete] 3283c609719bSwdenk [connected] 3284c609719bSwdenk ## Start Addr = 0x00040004 3285c609719bSwdenk 3286c609719bSwdenk => go 40004 Hello World! This is a test. 3287c609719bSwdenk ## Starting application at 0x00040004 ... 3288c609719bSwdenk Hello World 3289c609719bSwdenk argc = 7 3290c609719bSwdenk argv[0] = "40004" 3291c609719bSwdenk argv[1] = "Hello" 3292c609719bSwdenk argv[2] = "World!" 3293c609719bSwdenk argv[3] = "This" 3294c609719bSwdenk argv[4] = "is" 3295c609719bSwdenk argv[5] = "a" 3296c609719bSwdenk argv[6] = "test." 3297c609719bSwdenk argv[7] = "<NULL>" 3298c609719bSwdenk Hit any key to exit ... 3299c609719bSwdenk 3300c609719bSwdenk ## Application terminated, rc = 0x0 3301c609719bSwdenk 3302c609719bSwdenkAnother example, which demonstrates how to register a CPM interrupt 3303c609719bSwdenkhandler with the U-Boot code, can be found in 'examples/timer.c'. 3304c609719bSwdenkHere, a CPM timer is set up to generate an interrupt every second. 3305c609719bSwdenkThe interrupt service routine is trivial, just printing a '.' 3306c609719bSwdenkcharacter, but this is just a demo program. The application can be 3307c609719bSwdenkcontrolled by the following keys: 3308c609719bSwdenk 3309c609719bSwdenk ? - print current values og the CPM Timer registers 3310c609719bSwdenk b - enable interrupts and start timer 3311c609719bSwdenk e - stop timer and disable interrupts 3312c609719bSwdenk q - quit application 3313c609719bSwdenk 3314c609719bSwdenk => loads 3315c609719bSwdenk ## Ready for S-Record download ... 3316c609719bSwdenk ~>examples/timer.srec 3317c609719bSwdenk 1 2 3 4 5 6 7 8 9 10 11 ... 3318c609719bSwdenk [file transfer complete] 3319c609719bSwdenk [connected] 3320c609719bSwdenk ## Start Addr = 0x00040004 3321c609719bSwdenk 3322c609719bSwdenk => go 40004 3323c609719bSwdenk ## Starting application at 0x00040004 ... 3324c609719bSwdenk TIMERS=0xfff00980 3325c609719bSwdenk Using timer 1 3326c609719bSwdenk tgcr @ 0xfff00980, tmr @ 0xfff00990, trr @ 0xfff00994, tcr @ 0xfff00998, tcn @ 0xfff0099c, ter @ 0xfff009b0 3327c609719bSwdenk 3328c609719bSwdenkHit 'b': 3329c609719bSwdenk [q, b, e, ?] Set interval 1000000 us 3330c609719bSwdenk Enabling timer 3331c609719bSwdenkHit '?': 3332c609719bSwdenk [q, b, e, ?] ........ 3333c609719bSwdenk tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0xef6, ter=0x0 3334c609719bSwdenkHit '?': 3335c609719bSwdenk [q, b, e, ?] . 3336c609719bSwdenk tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x2ad4, ter=0x0 3337c609719bSwdenkHit '?': 3338c609719bSwdenk [q, b, e, ?] . 3339c609719bSwdenk tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x1efc, ter=0x0 3340c609719bSwdenkHit '?': 3341c609719bSwdenk [q, b, e, ?] . 3342c609719bSwdenk tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x169d, ter=0x0 3343c609719bSwdenkHit 'e': 3344c609719bSwdenk [q, b, e, ?] ...Stopping timer 3345c609719bSwdenkHit 'q': 3346c609719bSwdenk [q, b, e, ?] ## Application terminated, rc = 0x0 3347c609719bSwdenk 3348c609719bSwdenk 334985ec0bccSwdenkMinicom warning: 335085ec0bccSwdenk================ 335185ec0bccSwdenk 33527152b1d0SwdenkOver time, many people have reported problems when trying to use the 335385ec0bccSwdenk"minicom" terminal emulation program for serial download. I (wd) 335485ec0bccSwdenkconsider minicom to be broken, and recommend not to use it. Under 3355f07771ccSwdenkUnix, I recommend to use C-Kermit for general purpose use (and 335685ec0bccSwdenkespecially for kermit binary protocol download ("loadb" command), and 335785ec0bccSwdenkuse "cu" for S-Record download ("loads" command). 335885ec0bccSwdenk 335952f52c14SwdenkNevertheless, if you absolutely want to use it try adding this 336052f52c14Swdenkconfiguration to your "File transfer protocols" section: 336152f52c14Swdenk 336252f52c14Swdenk Name Program Name U/D FullScr IO-Red. Multi 336352f52c14Swdenk X kermit /usr/bin/kermit -i -l %l -s Y U Y N N 336452f52c14Swdenk Y kermit /usr/bin/kermit -i -l %l -r N D Y N N 336552f52c14Swdenk 336652f52c14Swdenk 3367c609719bSwdenkNetBSD Notes: 3368c609719bSwdenk============= 3369c609719bSwdenk 3370c609719bSwdenkStarting at version 0.9.2, U-Boot supports NetBSD both as host 3371c609719bSwdenk(build U-Boot) and target system (boots NetBSD/mpc8xx). 3372c609719bSwdenk 3373c609719bSwdenkBuilding requires a cross environment; it is known to work on 3374c609719bSwdenkNetBSD/i386 with the cross-powerpc-netbsd-1.3 package (you will also 3375c609719bSwdenkneed gmake since the Makefiles are not compatible with BSD make). 3376c609719bSwdenkNote that the cross-powerpc package does not install include files; 3377c609719bSwdenkattempting to build U-Boot will fail because <machine/ansi.h> is 3378c609719bSwdenkmissing. This file has to be installed and patched manually: 3379c609719bSwdenk 3380c609719bSwdenk # cd /usr/pkg/cross/powerpc-netbsd/include 3381c609719bSwdenk # mkdir powerpc 3382c609719bSwdenk # ln -s powerpc machine 3383c609719bSwdenk # cp /usr/src/sys/arch/powerpc/include/ansi.h powerpc/ansi.h 3384c609719bSwdenk # ${EDIT} powerpc/ansi.h ## must remove __va_list, _BSD_VA_LIST 3385c609719bSwdenk 3386c609719bSwdenkNative builds *don't* work due to incompatibilities between native 3387c609719bSwdenkand U-Boot include files. 3388c609719bSwdenk 3389c609719bSwdenkBooting assumes that (the first part of) the image booted is a 3390c609719bSwdenkstage-2 loader which in turn loads and then invokes the kernel 3391c609719bSwdenkproper. Loader sources will eventually appear in the NetBSD source 3392c609719bSwdenktree (probably in sys/arc/mpc8xx/stand/u-boot_stage2/); in the 33932a8af187Swdenkmeantime, see ftp://ftp.denx.de/pub/u-boot/ppcboot_stage2.tar.gz 3394c609719bSwdenk 3395c609719bSwdenk 3396c609719bSwdenkImplementation Internals: 3397c609719bSwdenk========================= 3398c609719bSwdenk 3399c609719bSwdenkThe following is not intended to be a complete description of every 3400c609719bSwdenkimplementation detail. However, it should help to understand the 3401c609719bSwdenkinner workings of U-Boot and make it easier to port it to custom 3402c609719bSwdenkhardware. 3403c609719bSwdenk 3404c609719bSwdenk 3405c609719bSwdenkInitial Stack, Global Data: 3406c609719bSwdenk--------------------------- 3407c609719bSwdenk 3408c609719bSwdenkThe implementation of U-Boot is complicated by the fact that U-Boot 3409c609719bSwdenkstarts running out of ROM (flash memory), usually without access to 3410c609719bSwdenksystem RAM (because the memory controller is not initialized yet). 3411c609719bSwdenkThis means that we don't have writable Data or BSS segments, and BSS 3412c609719bSwdenkis not initialized as zero. To be able to get a C environment working 3413c609719bSwdenkat all, we have to allocate at least a minimal stack. Implementation 3414c609719bSwdenkoptions for this are defined and restricted by the CPU used: Some CPU 3415c609719bSwdenkmodels provide on-chip memory (like the IMMR area on MPC8xx and 3416c609719bSwdenkMPC826x processors), on others (parts of) the data cache can be 3417c609719bSwdenklocked as (mis-) used as memory, etc. 3418c609719bSwdenk 34197152b1d0Swdenk Chris Hallinan posted a good summary of these issues to the 342043d9616cSwdenk u-boot-users mailing list: 342143d9616cSwdenk 342243d9616cSwdenk Subject: RE: [U-Boot-Users] RE: More On Memory Bank x (nothingness)? 342343d9616cSwdenk From: "Chris Hallinan" <clh@net1plus.com> 342443d9616cSwdenk Date: Mon, 10 Feb 2003 16:43:46 -0500 (22:43 MET) 342543d9616cSwdenk ... 342643d9616cSwdenk 342743d9616cSwdenk Correct me if I'm wrong, folks, but the way I understand it 342843d9616cSwdenk is this: Using DCACHE as initial RAM for Stack, etc, does not 342943d9616cSwdenk require any physical RAM backing up the cache. The cleverness 343043d9616cSwdenk is that the cache is being used as a temporary supply of 343143d9616cSwdenk necessary storage before the SDRAM controller is setup. It's 343243d9616cSwdenk beyond the scope of this list to expain the details, but you 343343d9616cSwdenk can see how this works by studying the cache architecture and 343443d9616cSwdenk operation in the architecture and processor-specific manuals. 343543d9616cSwdenk 343643d9616cSwdenk OCM is On Chip Memory, which I believe the 405GP has 4K. It 343743d9616cSwdenk is another option for the system designer to use as an 343843d9616cSwdenk initial stack/ram area prior to SDRAM being available. Either 343943d9616cSwdenk option should work for you. Using CS 4 should be fine if your 344043d9616cSwdenk board designers haven't used it for something that would 344143d9616cSwdenk cause you grief during the initial boot! It is frequently not 344243d9616cSwdenk used. 344343d9616cSwdenk 344443d9616cSwdenk CFG_INIT_RAM_ADDR should be somewhere that won't interfere 344543d9616cSwdenk with your processor/board/system design. The default value 344643d9616cSwdenk you will find in any recent u-boot distribution in 34478a316c9bSStefan Roese walnut.h should work for you. I'd set it to a value larger 344843d9616cSwdenk than your SDRAM module. If you have a 64MB SDRAM module, set 344943d9616cSwdenk it above 400_0000. Just make sure your board has no resources 345043d9616cSwdenk that are supposed to respond to that address! That code in 345143d9616cSwdenk start.S has been around a while and should work as is when 345243d9616cSwdenk you get the config right. 345343d9616cSwdenk 345443d9616cSwdenk -Chris Hallinan 345543d9616cSwdenk DS4.COM, Inc. 345643d9616cSwdenk 3457c609719bSwdenkIt is essential to remember this, since it has some impact on the C 3458c609719bSwdenkcode for the initialization procedures: 3459c609719bSwdenk 3460c609719bSwdenk* Initialized global data (data segment) is read-only. Do not attempt 3461c609719bSwdenk to write it. 3462c609719bSwdenk 3463c609719bSwdenk* Do not use any unitialized global data (or implicitely initialized 3464c609719bSwdenk as zero data - BSS segment) at all - this is undefined, initiali- 34657152b1d0Swdenk zation is performed later (when relocating to RAM). 3466c609719bSwdenk 3467c609719bSwdenk* Stack space is very limited. Avoid big data buffers or things like 3468c609719bSwdenk that. 3469c609719bSwdenk 3470c609719bSwdenkHaving only the stack as writable memory limits means we cannot use 3471c609719bSwdenknormal global data to share information beween the code. But it 3472c609719bSwdenkturned out that the implementation of U-Boot can be greatly 3473c609719bSwdenksimplified by making a global data structure (gd_t) available to all 3474c609719bSwdenkfunctions. We could pass a pointer to this data as argument to _all_ 3475c609719bSwdenkfunctions, but this would bloat the code. Instead we use a feature of 3476c609719bSwdenkthe GCC compiler (Global Register Variables) to share the data: we 3477c609719bSwdenkplace a pointer (gd) to the global data into a register which we 3478c609719bSwdenkreserve for this purpose. 3479c609719bSwdenk 34807152b1d0SwdenkWhen choosing a register for such a purpose we are restricted by the 3481c609719bSwdenkrelevant (E)ABI specifications for the current architecture, and by 3482c609719bSwdenkGCC's implementation. 3483c609719bSwdenk 3484c609719bSwdenkFor PowerPC, the following registers have specific use: 3485c609719bSwdenk R1: stack pointer 3486c609719bSwdenk R2: TOC pointer 3487c609719bSwdenk R3-R4: parameter passing and return values 3488c609719bSwdenk R5-R10: parameter passing 3489c609719bSwdenk R13: small data area pointer 3490c609719bSwdenk R30: GOT pointer 3491c609719bSwdenk R31: frame pointer 3492c609719bSwdenk 3493c609719bSwdenk (U-Boot also uses R14 as internal GOT pointer.) 3494c609719bSwdenk 3495c609719bSwdenk ==> U-Boot will use R29 to hold a pointer to the global data 3496c609719bSwdenk 3497c609719bSwdenk Note: on PPC, we could use a static initializer (since the 3498c609719bSwdenk address of the global data structure is known at compile time), 3499c609719bSwdenk but it turned out that reserving a register results in somewhat 3500c609719bSwdenk smaller code - although the code savings are not that big (on 3501c609719bSwdenk average for all boards 752 bytes for the whole U-Boot image, 3502c609719bSwdenk 624 text + 127 data). 3503c609719bSwdenk 3504c609719bSwdenkOn ARM, the following registers are used: 3505c609719bSwdenk 3506c609719bSwdenk R0: function argument word/integer result 3507c609719bSwdenk R1-R3: function argument word 3508c609719bSwdenk R9: GOT pointer 3509c609719bSwdenk R10: stack limit (used only if stack checking if enabled) 3510c609719bSwdenk R11: argument (frame) pointer 3511c609719bSwdenk R12: temporary workspace 3512c609719bSwdenk R13: stack pointer 3513c609719bSwdenk R14: link register 3514c609719bSwdenk R15: program counter 3515c609719bSwdenk 3516c609719bSwdenk ==> U-Boot will use R8 to hold a pointer to the global data 3517c609719bSwdenk 3518d87080b7SWolfgang DenkNOTE: DECLARE_GLOBAL_DATA_PTR must be used with file-global scope, 3519d87080b7SWolfgang Denkor current versions of GCC may "optimize" the code too much. 3520c609719bSwdenk 3521c609719bSwdenkMemory Management: 3522c609719bSwdenk------------------ 3523c609719bSwdenk 3524c609719bSwdenkU-Boot runs in system state and uses physical addresses, i.e. the 3525c609719bSwdenkMMU is not used either for address mapping nor for memory protection. 3526c609719bSwdenk 3527c609719bSwdenkThe available memory is mapped to fixed addresses using the memory 3528c609719bSwdenkcontroller. In this process, a contiguous block is formed for each 3529c609719bSwdenkmemory type (Flash, SDRAM, SRAM), even when it consists of several 3530c609719bSwdenkphysical memory banks. 3531c609719bSwdenk 3532c609719bSwdenkU-Boot is installed in the first 128 kB of the first Flash bank (on 3533c609719bSwdenkTQM8xxL modules this is the range 0x40000000 ... 0x4001FFFF). After 3534c609719bSwdenkbooting and sizing and initializing DRAM, the code relocates itself 3535c609719bSwdenkto the upper end of DRAM. Immediately below the U-Boot code some 3536c609719bSwdenkmemory is reserved for use by malloc() [see CFG_MALLOC_LEN 3537c609719bSwdenkconfiguration setting]. Below that, a structure with global Board 3538c609719bSwdenkInfo data is placed, followed by the stack (growing downward). 3539c609719bSwdenk 3540c609719bSwdenkAdditionally, some exception handler code is copied to the low 8 kB 3541c609719bSwdenkof DRAM (0x00000000 ... 0x00001FFF). 3542c609719bSwdenk 3543c609719bSwdenkSo a typical memory configuration with 16 MB of DRAM could look like 3544c609719bSwdenkthis: 3545c609719bSwdenk 3546c609719bSwdenk 0x0000 0000 Exception Vector code 3547c609719bSwdenk : 3548c609719bSwdenk 0x0000 1FFF 3549c609719bSwdenk 0x0000 2000 Free for Application Use 3550c609719bSwdenk : 3551c609719bSwdenk : 3552c609719bSwdenk 3553c609719bSwdenk : 3554c609719bSwdenk : 3555c609719bSwdenk 0x00FB FF20 Monitor Stack (Growing downward) 3556c609719bSwdenk 0x00FB FFAC Board Info Data and permanent copy of global data 3557c609719bSwdenk 0x00FC 0000 Malloc Arena 3558c609719bSwdenk : 3559c609719bSwdenk 0x00FD FFFF 3560c609719bSwdenk 0x00FE 0000 RAM Copy of Monitor Code 3561c609719bSwdenk ... eventually: LCD or video framebuffer 3562c609719bSwdenk ... eventually: pRAM (Protected RAM - unchanged by reset) 3563c609719bSwdenk 0x00FF FFFF [End of RAM] 3564c609719bSwdenk 3565c609719bSwdenk 3566c609719bSwdenkSystem Initialization: 3567c609719bSwdenk---------------------- 3568c609719bSwdenk 3569c609719bSwdenkIn the reset configuration, U-Boot starts at the reset entry point 3570c609719bSwdenk(on most PowerPC systens at address 0x00000100). Because of the reset 3571c609719bSwdenkconfiguration for CS0# this is a mirror of the onboard Flash memory. 35727152b1d0SwdenkTo be able to re-map memory U-Boot then jumps to its link address. 3573c609719bSwdenkTo be able to implement the initialization code in C, a (small!) 3574c609719bSwdenkinitial stack is set up in the internal Dual Ported RAM (in case CPUs 3575c609719bSwdenkwhich provide such a feature like MPC8xx or MPC8260), or in a locked 3576c609719bSwdenkpart of the data cache. After that, U-Boot initializes the CPU core, 3577c609719bSwdenkthe caches and the SIU. 3578c609719bSwdenk 3579c609719bSwdenkNext, all (potentially) available memory banks are mapped using a 3580c609719bSwdenkpreliminary mapping. For example, we put them on 512 MB boundaries 3581c609719bSwdenk(multiples of 0x20000000: SDRAM on 0x00000000 and 0x20000000, Flash 3582c609719bSwdenkon 0x40000000 and 0x60000000, SRAM on 0x80000000). Then UPM A is 3583c609719bSwdenkprogrammed for SDRAM access. Using the temporary configuration, a 3584c609719bSwdenksimple memory test is run that determines the size of the SDRAM 3585c609719bSwdenkbanks. 3586c609719bSwdenk 3587c609719bSwdenkWhen there is more than one SDRAM bank, and the banks are of 35887152b1d0Swdenkdifferent size, the largest is mapped first. For equal size, the first 3589c609719bSwdenkbank (CS2#) is mapped first. The first mapping is always for address 3590c609719bSwdenk0x00000000, with any additional banks following immediately to create 3591c609719bSwdenkcontiguous memory starting from 0. 3592c609719bSwdenk 3593c609719bSwdenkThen, the monitor installs itself at the upper end of the SDRAM area 3594c609719bSwdenkand allocates memory for use by malloc() and for the global Board 3595c609719bSwdenkInfo data; also, the exception vector code is copied to the low RAM 3596c609719bSwdenkpages, and the final stack is set up. 3597c609719bSwdenk 3598c609719bSwdenkOnly after this relocation will you have a "normal" C environment; 3599c609719bSwdenkuntil that you are restricted in several ways, mostly because you are 3600c609719bSwdenkrunning from ROM, and because the code will have to be relocated to a 3601c609719bSwdenknew address in RAM. 3602c609719bSwdenk 3603c609719bSwdenk 3604c609719bSwdenkU-Boot Porting Guide: 3605c609719bSwdenk---------------------- 3606c609719bSwdenk 3607c609719bSwdenk[Based on messages by Jerry Van Baren in the U-Boot-Users mailing 36086aff3115Swdenklist, October 2002] 3609c609719bSwdenk 3610c609719bSwdenk 3611c609719bSwdenkint main (int argc, char *argv[]) 3612c609719bSwdenk{ 3613c609719bSwdenk sighandler_t no_more_time; 3614c609719bSwdenk 3615c609719bSwdenk signal (SIGALRM, no_more_time); 3616c609719bSwdenk alarm (PROJECT_DEADLINE - toSec (3 * WEEK)); 3617c609719bSwdenk 3618c609719bSwdenk if (available_money > available_manpower) { 3619c609719bSwdenk pay consultant to port U-Boot; 3620c609719bSwdenk return 0; 3621c609719bSwdenk } 3622c609719bSwdenk 3623c609719bSwdenk Download latest U-Boot source; 3624c609719bSwdenk 36256aff3115Swdenk Subscribe to u-boot-users mailing list; 36266aff3115Swdenk 3627c609719bSwdenk if (clueless) { 3628c609719bSwdenk email ("Hi, I am new to U-Boot, how do I get started?"); 3629c609719bSwdenk } 3630c609719bSwdenk 3631c609719bSwdenk while (learning) { 3632c609719bSwdenk Read the README file in the top level directory; 36337cb22f97Swdenk Read http://www.denx.de/twiki/bin/view/DULG/Manual ; 3634c609719bSwdenk Read the source, Luke; 3635c609719bSwdenk } 3636c609719bSwdenk 3637c609719bSwdenk if (available_money > toLocalCurrency ($2500)) { 3638c609719bSwdenk Buy a BDI2000; 3639c609719bSwdenk } else { 3640c609719bSwdenk Add a lot of aggravation and time; 3641c609719bSwdenk } 3642c609719bSwdenk 3643c609719bSwdenk Create your own board support subdirectory; 3644c609719bSwdenk 36456aff3115Swdenk Create your own board config file; 36466aff3115Swdenk 3647c609719bSwdenk while (!running) { 3648c609719bSwdenk do { 3649c609719bSwdenk Add / modify source code; 3650c609719bSwdenk } until (compiles); 3651c609719bSwdenk Debug; 3652c609719bSwdenk if (clueless) 3653c609719bSwdenk email ("Hi, I am having problems..."); 3654c609719bSwdenk } 3655c609719bSwdenk Send patch file to Wolfgang; 3656c609719bSwdenk 3657c609719bSwdenk return 0; 3658c609719bSwdenk} 3659c609719bSwdenk 3660c609719bSwdenkvoid no_more_time (int sig) 3661c609719bSwdenk{ 3662c609719bSwdenk hire_a_guru(); 3663c609719bSwdenk} 3664c609719bSwdenk 3665c609719bSwdenk 3666c609719bSwdenkCoding Standards: 3667c609719bSwdenk----------------- 3668c609719bSwdenk 3669c609719bSwdenkAll contributions to U-Boot should conform to the Linux kernel 36702c051651SDetlev Zundelcoding style; see the file "Documentation/CodingStyle" and the script 36712c051651SDetlev Zundel"scripts/Lindent" in your Linux kernel source directory. In sources 36722c051651SDetlev Zundeloriginating from U-Boot a style corresponding to "Lindent -pcs" (adding 36732c051651SDetlev Zundelspaces before parameters to function calls) is actually used. 3674c609719bSwdenk 36752c051651SDetlev ZundelSource files originating from a different project (for example the 36762c051651SDetlev ZundelMTD subsystem) are generally exempt from these guidelines and are not 36772c051651SDetlev Zundelreformated to ease subsequent migration to newer versions of those 36782c051651SDetlev Zundelsources. 36792c051651SDetlev Zundel 36802c051651SDetlev ZundelPlease note that U-Boot is implemented in C (and to some small parts in 36812c051651SDetlev ZundelAssembler); no C++ is used, so please do not use C++ style comments (//) 36822c051651SDetlev Zundelin your code. 3683c609719bSwdenk 3684c178d3daSwdenkPlease also stick to the following formatting rules: 3685180d3f74Swdenk- remove any trailing white space 3686180d3f74Swdenk- use TAB characters for indentation, not spaces 3687180d3f74Swdenk- make sure NOT to use DOS '\r\n' line feeds 3688180d3f74Swdenk- do not add more than 2 empty lines to source files 3689180d3f74Swdenk- do not add trailing empty lines to source files 3690180d3f74Swdenk 3691c609719bSwdenkSubmissions which do not conform to the standards may be returned 3692c609719bSwdenkwith a request to reformat the changes. 3693c609719bSwdenk 3694c609719bSwdenk 3695c609719bSwdenkSubmitting Patches: 3696c609719bSwdenk------------------- 3697c609719bSwdenk 3698c609719bSwdenkSince the number of patches for U-Boot is growing, we need to 3699c609719bSwdenkestablish some rules. Submissions which do not conform to these rules 3700c609719bSwdenkmay be rejected, even when they contain important and valuable stuff. 3701c609719bSwdenk 370290dc6704SwdenkPatches shall be sent to the u-boot-users mailing list. 3703c609719bSwdenk 3704c609719bSwdenkWhen you send a patch, please include the following information with 3705c609719bSwdenkit: 3706c609719bSwdenk 3707c609719bSwdenk* For bug fixes: a description of the bug and how your patch fixes 3708c609719bSwdenk this bug. Please try to include a way of demonstrating that the 3709c609719bSwdenk patch actually fixes something. 3710c609719bSwdenk 3711c609719bSwdenk* For new features: a description of the feature and your 3712c609719bSwdenk implementation. 3713c609719bSwdenk 3714c609719bSwdenk* A CHANGELOG entry as plaintext (separate from the patch) 3715c609719bSwdenk 3716c609719bSwdenk* For major contributions, your entry to the CREDITS file 3717c609719bSwdenk 3718c609719bSwdenk* When you add support for a new board, don't forget to add this 3719c609719bSwdenk board to the MAKEALL script, too. 3720c609719bSwdenk 3721c609719bSwdenk* If your patch adds new configuration options, don't forget to 3722c609719bSwdenk document these in the README file. 3723c609719bSwdenk 3724c609719bSwdenk* The patch itself. If you are accessing the CVS repository use "cvs 3725c609719bSwdenk update; cvs diff -puRN"; else, use "diff -purN OLD NEW". If your 3726c609719bSwdenk version of diff does not support these options, then get the latest 3727c609719bSwdenk version of GNU diff. 3728c609719bSwdenk 37296dff5529Swdenk The current directory when running this command shall be the top 37306dff5529Swdenk level directory of the U-Boot source tree, or it's parent directory 37316dff5529Swdenk (i. e. please make sure that your patch includes sufficient 37326dff5529Swdenk directory information for the affected files). 37336dff5529Swdenk 3734c609719bSwdenk We accept patches as plain text, MIME attachments or as uuencoded 3735c609719bSwdenk gzipped text. 3736c609719bSwdenk 373752f52c14Swdenk* If one logical set of modifications affects or creates several 373852f52c14Swdenk files, all these changes shall be submitted in a SINGLE patch file. 373952f52c14Swdenk 374052f52c14Swdenk* Changesets that contain different, unrelated modifications shall be 374152f52c14Swdenk submitted as SEPARATE patches, one patch per changeset. 374252f52c14Swdenk 374352f52c14Swdenk 3744c609719bSwdenkNotes: 3745c609719bSwdenk 3746c609719bSwdenk* Before sending the patch, run the MAKEALL script on your patched 3747c609719bSwdenk source tree and make sure that no errors or warnings are reported 3748c609719bSwdenk for any of the boards. 3749c609719bSwdenk 3750c609719bSwdenk* Keep your modifications to the necessary minimum: A patch 3751c609719bSwdenk containing several unrelated changes or arbitrary reformats will be 3752c609719bSwdenk returned with a request to re-formatting / split it. 3753c609719bSwdenk 3754c609719bSwdenk* If you modify existing code, make sure that your new code does not 3755c609719bSwdenk add to the memory footprint of the code ;-) Small is beautiful! 3756c609719bSwdenk When adding new features, these should compile conditionally only 3757c609719bSwdenk (using #ifdef), and the resulting code with the new feature 3758c609719bSwdenk disabled must not need more memory than the old code without your 3759c609719bSwdenk modification. 376090dc6704Swdenk 376190dc6704Swdenk* Remember that there is a size limit of 40 kB per message on the 376290dc6704Swdenk u-boot-users mailing list. Compression may help. 3763