1 c609719bSwdenk# 2 218ca724SWolfgang Denk# (C) Copyright 2000 - 2008 3 c609719bSwdenk# Wolfgang Denk, DENX Software Engineering, wd@denx.de. 4 c609719bSwdenk# 5 c609719bSwdenk# See file CREDITS for list of people who contributed to this 6 c609719bSwdenk# project. 7 c609719bSwdenk# 8 c609719bSwdenk# This program is free software; you can redistribute it and/or 9 c609719bSwdenk# modify it under the terms of the GNU General Public License as 10 c609719bSwdenk# published by the Free Software Foundation; either version 2 of 11 c609719bSwdenk# the License, or (at your option) any later version. 12 c609719bSwdenk# 13 c609719bSwdenk# This program is distributed in the hope that it will be useful, 14 c609719bSwdenk# but WITHOUT ANY WARRANTY; without even the implied warranty of 15 c609719bSwdenk# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 c609719bSwdenk# GNU General Public License for more details. 17 c609719bSwdenk# 18 c609719bSwdenk# You should have received a copy of the GNU General Public License 19 c609719bSwdenk# along with this program; if not, write to the Free Software 20 c609719bSwdenk# Foundation, Inc., 59 Temple Place, Suite 330, Boston, 21 c609719bSwdenk# MA 02111-1307 USA 22 c609719bSwdenk# 23 c609719bSwdenk 24 c609719bSwdenkSummary: 25 c609719bSwdenk======== 26 c609719bSwdenk 27 24ee89b9SwdenkThis directory contains the source code for U-Boot, a boot loader for 28 e86e5a07SwdenkEmbedded boards based on PowerPC, ARM, MIPS and several other 29 e86e5a07Swdenkprocessors, which can be installed in a boot ROM and used to 30 e86e5a07Swdenkinitialize and test the hardware or to download and run application 31 e86e5a07Swdenkcode. 32 c609719bSwdenk 33 c609719bSwdenkThe development of U-Boot is closely related to Linux: some parts of 34 24ee89b9Swdenkthe source code originate in the Linux source tree, we have some 35 24ee89b9Swdenkheader files in common, and special provision has been made to 36 c609719bSwdenksupport booting of Linux images. 37 c609719bSwdenk 38 c609719bSwdenkSome attention has been paid to make this software easily 39 c609719bSwdenkconfigurable and extendable. For instance, all monitor commands are 40 c609719bSwdenkimplemented with the same call interface, so that it's very easy to 41 c609719bSwdenkadd new commands. Also, instead of permanently adding rarely used 42 c609719bSwdenkcode (for instance hardware test utilities) to the monitor, you can 43 c609719bSwdenkload and run it dynamically. 44 c609719bSwdenk 45 c609719bSwdenk 46 c609719bSwdenkStatus: 47 c609719bSwdenk======= 48 c609719bSwdenk 49 c609719bSwdenkIn general, all boards for which a configuration option exists in the 50 c609719bSwdenkMakefile have been tested to some extent and can be considered 51 c609719bSwdenk"working". In fact, many of them are used in production systems. 52 c609719bSwdenk 53 c609719bSwdenkIn case of problems see the CHANGELOG and CREDITS files to find out 54 218ca724SWolfgang Denkwho contributed the specific port. The MAINTAINERS file lists board 55 218ca724SWolfgang Denkmaintainers. 56 c609719bSwdenk 57 c609719bSwdenk 58 c609719bSwdenkWhere to get help: 59 c609719bSwdenk================== 60 c609719bSwdenk 61 c609719bSwdenkIn case you have questions about, problems with or contributions for 62 c609719bSwdenkU-Boot you should send a message to the U-Boot mailing list at 63 0c32565fSPeter Tyser<u-boot@lists.denx.de>. There is also an archive of previous traffic 64 0c32565fSPeter Tyseron the mailing list - please search the archive before asking FAQ's. 65 0c32565fSPeter TyserPlease see http://lists.denx.de/pipermail/u-boot and 66 0c32565fSPeter Tyserhttp://dir.gmane.org/gmane.comp.boot-loaders.u-boot 67 c609719bSwdenk 68 c609719bSwdenk 69 218ca724SWolfgang DenkWhere to get source code: 70 218ca724SWolfgang Denk========================= 71 218ca724SWolfgang Denk 72 218ca724SWolfgang DenkThe U-Boot source code is maintained in the git repository at 73 218ca724SWolfgang Denkgit://www.denx.de/git/u-boot.git ; you can browse it online at 74 218ca724SWolfgang Denkhttp://www.denx.de/cgi-bin/gitweb.cgi?p=u-boot.git;a=summary 75 218ca724SWolfgang Denk 76 218ca724SWolfgang DenkThe "snapshot" links on this page allow you to download tarballs of 77 11ccc33fSMarcel Ziswilerany version you might be interested in. Official releases are also 78 218ca724SWolfgang Denkavailable for FTP download from the ftp://ftp.denx.de/pub/u-boot/ 79 218ca724SWolfgang Denkdirectory. 80 218ca724SWolfgang Denk 81 d4ee711dSAnatolij GustschinPre-built (and tested) images are available from 82 218ca724SWolfgang Denkftp://ftp.denx.de/pub/u-boot/images/ 83 218ca724SWolfgang Denk 84 218ca724SWolfgang Denk 85 c609719bSwdenkWhere we come from: 86 c609719bSwdenk=================== 87 c609719bSwdenk 88 c609719bSwdenk- start from 8xxrom sources 89 24ee89b9Swdenk- create PPCBoot project (http://sourceforge.net/projects/ppcboot) 90 c609719bSwdenk- clean up code 91 c609719bSwdenk- make it easier to add custom boards 92 c609719bSwdenk- make it possible to add other [PowerPC] CPUs 93 c609719bSwdenk- extend functions, especially: 94 c609719bSwdenk * Provide extended interface to Linux boot loader 95 c609719bSwdenk * S-Record download 96 c609719bSwdenk * network boot 97 11ccc33fSMarcel Ziswiler * PCMCIA / CompactFlash / ATA disk / SCSI ... boot 98 24ee89b9Swdenk- create ARMBoot project (http://sourceforge.net/projects/armboot) 99 c609719bSwdenk- add other CPU families (starting with ARM) 100 24ee89b9Swdenk- create U-Boot project (http://sourceforge.net/projects/u-boot) 101 0d28f34bSMagnus Lilja- current project page: see http://www.denx.de/wiki/U-Boot 102 24ee89b9Swdenk 103 24ee89b9Swdenk 104 24ee89b9SwdenkNames and Spelling: 105 24ee89b9Swdenk=================== 106 24ee89b9Swdenk 107 24ee89b9SwdenkThe "official" name of this project is "Das U-Boot". The spelling 108 24ee89b9Swdenk"U-Boot" shall be used in all written text (documentation, comments 109 24ee89b9Swdenkin source files etc.). Example: 110 24ee89b9Swdenk 111 24ee89b9Swdenk This is the README file for the U-Boot project. 112 24ee89b9Swdenk 113 24ee89b9SwdenkFile names etc. shall be based on the string "u-boot". Examples: 114 24ee89b9Swdenk 115 24ee89b9Swdenk include/asm-ppc/u-boot.h 116 24ee89b9Swdenk 117 24ee89b9Swdenk #include <asm/u-boot.h> 118 24ee89b9Swdenk 119 24ee89b9SwdenkVariable names, preprocessor constants etc. shall be either based on 120 24ee89b9Swdenkthe string "u_boot" or on "U_BOOT". Example: 121 24ee89b9Swdenk 122 24ee89b9Swdenk U_BOOT_VERSION u_boot_logo 123 24ee89b9Swdenk IH_OS_U_BOOT u_boot_hush_start 124 c609719bSwdenk 125 c609719bSwdenk 126 93f19cc0SwdenkVersioning: 127 93f19cc0Swdenk=========== 128 93f19cc0Swdenk 129 93f19cc0SwdenkU-Boot uses a 3 level version number containing a version, a 130 93f19cc0Swdenksub-version, and a patchlevel: "U-Boot-2.34.5" means version "2", 131 93f19cc0Swdenksub-version "34", and patchlevel "4". 132 93f19cc0Swdenk 133 93f19cc0SwdenkThe patchlevel is used to indicate certain stages of development 134 93f19cc0Swdenkbetween released versions, i. e. officially released versions of 135 93f19cc0SwdenkU-Boot will always have a patchlevel of "0". 136 93f19cc0Swdenk 137 93f19cc0Swdenk 138 c609719bSwdenkDirectory Hierarchy: 139 c609719bSwdenk==================== 140 c609719bSwdenk 141 7152b1d0Swdenk- board Board dependent files 142 7152b1d0Swdenk- common Misc architecture independent functions 143 c609719bSwdenk- cpu CPU specific files 144 983fda83Swdenk - 74xx_7xx Files specific to Freescale MPC74xx and 7xx CPUs 145 11dadd54Swdenk - arm720t Files specific to ARM 720 CPUs 146 11dadd54Swdenk - arm920t Files specific to ARM 920 CPUs 147 a85f9f21Swdenk - at91rm9200 Files specific to Atmel AT91RM9200 CPU 148 983fda83Swdenk - imx Files specific to Freescale MC9328 i.MX CPUs 149 1d9f4105Swdenk - s3c24x0 Files specific to Samsung S3C24X0 CPUs 150 11dadd54Swdenk - arm925t Files specific to ARM 925 CPUs 151 11dadd54Swdenk - arm926ejs Files specific to ARM 926 CPUs 152 8ed96046Swdenk - arm1136 Files specific to ARM 1136 CPUs 153 72a087e0SWolfgang Denk - at32ap Files specific to Atmel AVR32 AP CPUs 154 adbfeeb7SMike Frysinger - blackfin Files specific to Analog Devices Blackfin CPUs 155 11dadd54Swdenk - i386 Files specific to i386 CPUs 156 11dadd54Swdenk - ixp Files specific to Intel XScale IXP CPUs 157 b330990cSDaniel Hellstrom - leon2 Files specific to Gaisler LEON2 SPARC CPU 158 1e9a164eSDaniel Hellstrom - leon3 Files specific to Gaisler LEON3 SPARC CPU 159 983fda83Swdenk - mcf52x2 Files specific to Freescale ColdFire MCF52x2 CPUs 160 1552af70STsiChungLiew - mcf5227x Files specific to Freescale ColdFire MCF5227x CPUs 161 8e585f02STsiChung Liew - mcf532x Files specific to Freescale ColdFire MCF5329 CPUs 162 8ae158cdSTsiChungLiew - mcf5445x Files specific to Freescale ColdFire MCF5445x CPUs 163 57a12720STsiChungLiew - mcf547x_8x Files specific to Freescale ColdFire MCF547x_8x CPUs 164 11dadd54Swdenk - mips Files specific to MIPS CPUs 165 983fda83Swdenk - mpc5xx Files specific to Freescale MPC5xx CPUs 166 983fda83Swdenk - mpc5xxx Files specific to Freescale MPC5xxx CPUs 167 983fda83Swdenk - mpc8xx Files specific to Freescale MPC8xx CPUs 168 983fda83Swdenk - mpc8220 Files specific to Freescale MPC8220 CPUs 169 983fda83Swdenk - mpc824x Files specific to Freescale MPC824x CPUs 170 983fda83Swdenk - mpc8260 Files specific to Freescale MPC8260 CPUs 171 983fda83Swdenk - mpc85xx Files specific to Freescale MPC85xx CPUs 172 11dadd54Swdenk - nios Files specific to Altera NIOS CPUs 173 5c952cf0Swdenk - nios2 Files specific to Altera Nios-II CPUs 174 0c8721a4SWolfgang Denk - ppc4xx Files specific to AMCC PowerPC 4xx CPUs 175 11dadd54Swdenk - pxa Files specific to Intel XScale PXA CPUs 176 11dadd54Swdenk - s3c44b0 Files specific to Samsung S3C44B0 CPUs 177 11dadd54Swdenk - sa1100 Files specific to Intel StrongARM SA1100 CPUs 178 c609719bSwdenk- disk Code for disk drive partition handling 179 c609719bSwdenk- doc Documentation (don't expect too much) 180 7152b1d0Swdenk- drivers Commonly used device drivers 181 c609719bSwdenk- dtt Digital Thermometer and Thermostat drivers 182 c609719bSwdenk- examples Example code for standalone applications, etc. 183 c609719bSwdenk- include Header Files 184 11dadd54Swdenk- lib_arm Files generic to ARM architecture 185 7b64fef3SWolfgang Denk- lib_avr32 Files generic to AVR32 architecture 186 adbfeeb7SMike Frysinger- lib_blackfin Files generic to Blackfin architecture 187 11dadd54Swdenk- lib_generic Files generic to all architectures 188 11dadd54Swdenk- lib_i386 Files generic to i386 architecture 189 11dadd54Swdenk- lib_m68k Files generic to m68k architecture 190 11dadd54Swdenk- lib_mips Files generic to MIPS architecture 191 11dadd54Swdenk- lib_nios Files generic to NIOS architecture 192 11dadd54Swdenk- lib_ppc Files generic to PowerPC architecture 193 c2f02da2SDaniel Hellstrom- lib_sparc Files generic to SPARC architecture 194 213bf8c8SGerald Van Baren- libfdt Library files to support flattened device trees 195 c609719bSwdenk- net Networking code 196 c609719bSwdenk- post Power On Self Test 197 c609719bSwdenk- rtc Real Time Clock drivers 198 c609719bSwdenk- tools Tools to build S-Record or U-Boot images, etc. 199 c609719bSwdenk 200 c609719bSwdenkSoftware Configuration: 201 c609719bSwdenk======================= 202 c609719bSwdenk 203 c609719bSwdenkConfiguration is usually done using C preprocessor defines; the 204 c609719bSwdenkrationale behind that is to avoid dead code whenever possible. 205 c609719bSwdenk 206 c609719bSwdenkThere are two classes of configuration variables: 207 c609719bSwdenk 208 c609719bSwdenk* Configuration _OPTIONS_: 209 c609719bSwdenk These are selectable by the user and have names beginning with 210 c609719bSwdenk "CONFIG_". 211 c609719bSwdenk 212 c609719bSwdenk* Configuration _SETTINGS_: 213 c609719bSwdenk These depend on the hardware etc. and should not be meddled with if 214 c609719bSwdenk you don't know what you're doing; they have names beginning with 215 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD "CONFIG_SYS_". 216 c609719bSwdenk 217 c609719bSwdenkLater we will add a configuration tool - probably similar to or even 218 c609719bSwdenkidentical to what's used for the Linux kernel. Right now, we have to 219 c609719bSwdenkdo the configuration by hand, which means creating some symbolic 220 c609719bSwdenklinks and editing some configuration files. We use the TQM8xxL boards 221 c609719bSwdenkas an example here. 222 c609719bSwdenk 223 c609719bSwdenk 224 c609719bSwdenkSelection of Processor Architecture and Board Type: 225 c609719bSwdenk--------------------------------------------------- 226 c609719bSwdenk 227 c609719bSwdenkFor all supported boards there are ready-to-use default 228 c609719bSwdenkconfigurations available; just type "make <board_name>_config". 229 c609719bSwdenk 230 c609719bSwdenkExample: For a TQM823L module type: 231 c609719bSwdenk 232 c609719bSwdenk cd u-boot 233 c609719bSwdenk make TQM823L_config 234 c609719bSwdenk 235 11ccc33fSMarcel ZiswilerFor the Cogent platform, you need to specify the CPU type as well; 236 c609719bSwdenke.g. "make cogent_mpc8xx_config". And also configure the cogent 237 c609719bSwdenkdirectory according to the instructions in cogent/README. 238 c609719bSwdenk 239 c609719bSwdenk 240 c609719bSwdenkConfiguration Options: 241 c609719bSwdenk---------------------- 242 c609719bSwdenk 243 c609719bSwdenkConfiguration depends on the combination of board and CPU type; all 244 c609719bSwdenksuch information is kept in a configuration file 245 c609719bSwdenk"include/configs/<board_name>.h". 246 c609719bSwdenk 247 c609719bSwdenkExample: For a TQM823L module, all configuration settings are in 248 c609719bSwdenk"include/configs/TQM823L.h". 249 c609719bSwdenk 250 c609719bSwdenk 251 7f6c2cbcSwdenkMany of the options are named exactly as the corresponding Linux 252 7f6c2cbcSwdenkkernel configuration options. The intention is to make it easier to 253 7f6c2cbcSwdenkbuild a config tool - later. 254 7f6c2cbcSwdenk 255 7f6c2cbcSwdenk 256 c609719bSwdenkThe following options need to be configured: 257 c609719bSwdenk 258 2628114eSKim Phillips- CPU Type: Define exactly one, e.g. CONFIG_MPC85XX. 259 c609719bSwdenk 260 2628114eSKim Phillips- Board Type: Define exactly one, e.g. CONFIG_MPC8540ADS. 261 6ccec449SWolfgang Denk 262 6ccec449SWolfgang Denk- CPU Daughterboard Type: (if CONFIG_ATSTK1000 is defined) 263 09ea0de0SHaavard Skinnemoen Define exactly one, e.g. CONFIG_ATSTK1002 264 c609719bSwdenk 265 c609719bSwdenk- CPU Module Type: (if CONFIG_COGENT is defined) 266 c609719bSwdenk Define exactly one of 267 c609719bSwdenk CONFIG_CMA286_60_OLD 268 c609719bSwdenk--- FIXME --- not tested yet: 269 c609719bSwdenk CONFIG_CMA286_60, CONFIG_CMA286_21, CONFIG_CMA286_60P, 270 c609719bSwdenk CONFIG_CMA287_23, CONFIG_CMA287_50 271 c609719bSwdenk 272 c609719bSwdenk- Motherboard Type: (if CONFIG_COGENT is defined) 273 c609719bSwdenk Define exactly one of 274 c609719bSwdenk CONFIG_CMA101, CONFIG_CMA102 275 c609719bSwdenk 276 c609719bSwdenk- Motherboard I/O Modules: (if CONFIG_COGENT is defined) 277 c609719bSwdenk Define one or more of 278 c609719bSwdenk CONFIG_CMA302 279 c609719bSwdenk 280 c609719bSwdenk- Motherboard Options: (if CONFIG_CMA101 or CONFIG_CMA102 are defined) 281 c609719bSwdenk Define one or more of 282 c609719bSwdenk CONFIG_LCD_HEARTBEAT - update a character position on 283 11ccc33fSMarcel Ziswiler the LCD display every second with 284 c609719bSwdenk a "rotator" |\-/|\-/ 285 c609719bSwdenk 286 2535d602Swdenk- Board flavour: (if CONFIG_MPC8260ADS is defined) 287 2535d602Swdenk CONFIG_ADSTYPE 288 2535d602Swdenk Possible values are: 289 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_8260ADS - original MPC8260ADS 290 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_8266ADS - MPC8266ADS 291 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_PQ2FADS - PQ2FADS-ZU or PQ2FADS-VR 292 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_8272ADS - MPC8272ADS 293 2535d602Swdenk 294 c609719bSwdenk- MPC824X Family Member (if CONFIG_MPC824X is defined) 295 c609719bSwdenk Define exactly one of 296 c609719bSwdenk CONFIG_MPC8240, CONFIG_MPC8245 297 c609719bSwdenk 298 11ccc33fSMarcel Ziswiler- 8xx CPU Options: (if using an MPC8xx CPU) 299 66ca92a5Swdenk CONFIG_8xx_GCLK_FREQ - deprecated: CPU clock if 300 66ca92a5Swdenk get_gclk_freq() cannot work 301 5da627a4Swdenk e.g. if there is no 32KHz 302 5da627a4Swdenk reference PIT/RTC clock 303 66ca92a5Swdenk CONFIG_8xx_OSCLK - PLL input clock (either EXTCLK 304 66ca92a5Swdenk or XTAL/EXTAL) 305 c609719bSwdenk 306 66ca92a5Swdenk- 859/866/885 CPU options: (if using a MPC859 or MPC866 or MPC885 CPU): 307 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_8xx_CPUCLK_MIN 308 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_8xx_CPUCLK_MAX 309 66ca92a5Swdenk CONFIG_8xx_CPUCLK_DEFAULT 310 75d1ea7fSwdenk See doc/README.MPC866 311 75d1ea7fSwdenk 312 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_MEASURE_CPUCLK 313 75d1ea7fSwdenk 314 75d1ea7fSwdenk Define this to measure the actual CPU clock instead 315 75d1ea7fSwdenk of relying on the correctness of the configured 316 75d1ea7fSwdenk values. Mostly useful for board bringup to make sure 317 75d1ea7fSwdenk the PLL is locked at the intended frequency. Note 318 75d1ea7fSwdenk that this requires a (stable) reference clock (32 kHz 319 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD RTC clock or CONFIG_SYS_8XX_XIN) 320 75d1ea7fSwdenk 321 506f3918SHeiko Schocher CONFIG_SYS_DELAYED_ICACHE 322 506f3918SHeiko Schocher 323 506f3918SHeiko Schocher Define this option if you want to enable the 324 506f3918SHeiko Schocher ICache only when Code runs from RAM. 325 506f3918SHeiko Schocher 326 0b953ffcSMarkus Klotzbuecher- Intel Monahans options: 327 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_MONAHANS_RUN_MODE_OSC_RATIO 328 0b953ffcSMarkus Klotzbuecher 329 0b953ffcSMarkus Klotzbuecher Defines the Monahans run mode to oscillator 330 0b953ffcSMarkus Klotzbuecher ratio. Valid values are 8, 16, 24, 31. The core 331 0b953ffcSMarkus Klotzbuecher frequency is this value multiplied by 13 MHz. 332 0b953ffcSMarkus Klotzbuecher 333 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_MONAHANS_TURBO_RUN_MODE_RATIO 334 0b953ffcSMarkus Klotzbuecher 335 0b953ffcSMarkus Klotzbuecher Defines the Monahans turbo mode to oscillator 336 0b953ffcSMarkus Klotzbuecher ratio. Valid values are 1 (default if undefined) and 337 0b953ffcSMarkus Klotzbuecher 2. The core frequency as calculated above is multiplied 338 0b953ffcSMarkus Klotzbuecher by this value. 339 0b953ffcSMarkus Klotzbuecher 340 5da627a4Swdenk- Linux Kernel Interface: 341 c609719bSwdenk CONFIG_CLOCKS_IN_MHZ 342 c609719bSwdenk 343 c609719bSwdenk U-Boot stores all clock information in Hz 344 c609719bSwdenk internally. For binary compatibility with older Linux 345 c609719bSwdenk kernels (which expect the clocks passed in the 346 c609719bSwdenk bd_info data to be in MHz) the environment variable 347 c609719bSwdenk "clocks_in_mhz" can be defined so that U-Boot 348 c609719bSwdenk converts clock data to MHZ before passing it to the 349 c609719bSwdenk Linux kernel. 350 c609719bSwdenk When CONFIG_CLOCKS_IN_MHZ is defined, a definition of 351 c609719bSwdenk "clocks_in_mhz=1" is automatically included in the 352 c609719bSwdenk default environment. 353 c609719bSwdenk 354 5da627a4Swdenk CONFIG_MEMSIZE_IN_BYTES [relevant for MIPS only] 355 5da627a4Swdenk 356 11ccc33fSMarcel Ziswiler When transferring memsize parameter to linux, some versions 357 5da627a4Swdenk expect it to be in bytes, others in MB. 358 5da627a4Swdenk Define CONFIG_MEMSIZE_IN_BYTES to make it in bytes. 359 5da627a4Swdenk 360 fec6d9eeSGerald Van Baren CONFIG_OF_LIBFDT 361 f57f70aaSWolfgang Denk 362 f57f70aaSWolfgang Denk New kernel versions are expecting firmware settings to be 363 213bf8c8SGerald Van Baren passed using flattened device trees (based on open firmware 364 213bf8c8SGerald Van Baren concepts). 365 213bf8c8SGerald Van Baren 366 213bf8c8SGerald Van Baren CONFIG_OF_LIBFDT 367 213bf8c8SGerald Van Baren * New libfdt-based support 368 213bf8c8SGerald Van Baren * Adds the "fdt" command 369 3bb342fcSKim Phillips * The bootm command automatically updates the fdt 370 213bf8c8SGerald Van Baren 371 b55ae402SMarcel Ziswiler OF_CPU - The proper name of the cpus node (only required for 372 b55ae402SMarcel Ziswiler MPC512X and MPC5xxx based boards). 373 b55ae402SMarcel Ziswiler OF_SOC - The proper name of the soc node (only required for 374 b55ae402SMarcel Ziswiler MPC512X and MPC5xxx based boards). 375 f57f70aaSWolfgang Denk OF_TBCLK - The timebase frequency. 376 c2871f03SKumar Gala OF_STDOUT_PATH - The path to the console device 377 f57f70aaSWolfgang Denk 378 11ccc33fSMarcel Ziswiler boards with QUICC Engines require OF_QE to set UCC MAC 379 11ccc33fSMarcel Ziswiler addresses 380 3bb342fcSKim Phillips 381 4e253137SKumar Gala CONFIG_OF_BOARD_SETUP 382 4e253137SKumar Gala 383 4e253137SKumar Gala Board code has addition modification that it wants to make 384 4e253137SKumar Gala to the flat device tree before handing it off to the kernel 385 6705d81eSwdenk 386 0267768eSMatthew McClintock CONFIG_OF_BOOT_CPU 387 0267768eSMatthew McClintock 388 11ccc33fSMarcel Ziswiler This define fills in the correct boot CPU in the boot 389 0267768eSMatthew McClintock param header, the default value is zero if undefined. 390 0267768eSMatthew McClintock 391 3887c3fbSHeiko Schocher CONFIG_OF_IDE_FIXUP 392 3887c3fbSHeiko Schocher 393 3887c3fbSHeiko Schocher U-Boot can detect if an IDE device is present or not. 394 3887c3fbSHeiko Schocher If not, and this new config option is activated, U-Boot 395 3887c3fbSHeiko Schocher removes the ATA node from the DTS before booting Linux, 396 3887c3fbSHeiko Schocher so the Linux IDE driver does not probe the device and 397 3887c3fbSHeiko Schocher crash. This is needed for buggy hardware (uc101) where 398 3887c3fbSHeiko Schocher no pull down resistor is connected to the signal IDE5V_DD7. 399 3887c3fbSHeiko Schocher 400 0b2f4ecaSNiklaus Giger- vxWorks boot parameters: 401 0b2f4ecaSNiklaus Giger 402 0b2f4ecaSNiklaus Giger bootvx constructs a valid bootline using the following 403 0b2f4ecaSNiklaus Giger environments variables: bootfile, ipaddr, serverip, hostname. 404 0b2f4ecaSNiklaus Giger It loads the vxWorks image pointed bootfile. 405 0b2f4ecaSNiklaus Giger 406 0b2f4ecaSNiklaus Giger CONFIG_SYS_VXWORKS_BOOT_DEVICE - The vxworks device name 407 0b2f4ecaSNiklaus Giger CONFIG_SYS_VXWORKS_MAC_PTR - Ethernet 6 byte MA -address 408 0b2f4ecaSNiklaus Giger CONFIG_SYS_VXWORKS_SERVERNAME - Name of the server 409 0b2f4ecaSNiklaus Giger CONFIG_SYS_VXWORKS_BOOT_ADDR - Address of boot parameters 410 0b2f4ecaSNiklaus Giger 411 0b2f4ecaSNiklaus Giger CONFIG_SYS_VXWORKS_ADD_PARAMS 412 0b2f4ecaSNiklaus Giger 413 0b2f4ecaSNiklaus Giger Add it at the end of the bootline. E.g "u=username pw=secret" 414 0b2f4ecaSNiklaus Giger 415 0b2f4ecaSNiklaus Giger Note: If a "bootargs" environment is defined, it will overwride 416 0b2f4ecaSNiklaus Giger the defaults discussed just above. 417 0b2f4ecaSNiklaus Giger 418 6705d81eSwdenk- Serial Ports: 419 48d0192fSAndreas Engel CONFIG_PL010_SERIAL 420 6705d81eSwdenk 421 6705d81eSwdenk Define this if you want support for Amba PrimeCell PL010 UARTs. 422 6705d81eSwdenk 423 48d0192fSAndreas Engel CONFIG_PL011_SERIAL 424 6705d81eSwdenk 425 6705d81eSwdenk Define this if you want support for Amba PrimeCell PL011 UARTs. 426 6705d81eSwdenk 427 6705d81eSwdenk CONFIG_PL011_CLOCK 428 6705d81eSwdenk 429 6705d81eSwdenk If you have Amba PrimeCell PL011 UARTs, set this variable to 430 6705d81eSwdenk the clock speed of the UARTs. 431 6705d81eSwdenk 432 6705d81eSwdenk CONFIG_PL01x_PORTS 433 6705d81eSwdenk 434 6705d81eSwdenk If you have Amba PrimeCell PL010 or PL011 UARTs on your board, 435 6705d81eSwdenk define this to a list of base addresses for each (supported) 436 6705d81eSwdenk port. See e.g. include/configs/versatile.h 437 6705d81eSwdenk 438 6705d81eSwdenk 439 c609719bSwdenk- Console Interface: 440 c609719bSwdenk Depending on board, define exactly one serial port 441 c609719bSwdenk (like CONFIG_8xx_CONS_SMC1, CONFIG_8xx_CONS_SMC2, 442 c609719bSwdenk CONFIG_8xx_CONS_SCC1, ...), or switch off the serial 443 c609719bSwdenk console by defining CONFIG_8xx_CONS_NONE 444 c609719bSwdenk 445 c609719bSwdenk Note: if CONFIG_8xx_CONS_NONE is defined, the serial 446 c609719bSwdenk port routines must be defined elsewhere 447 c609719bSwdenk (i.e. serial_init(), serial_getc(), ...) 448 c609719bSwdenk 449 c609719bSwdenk CONFIG_CFB_CONSOLE 450 c609719bSwdenk Enables console device for a color framebuffer. Needs following 451 c609719bSwdenk defines (cf. smiLynxEM, i8042, board/eltec/bab7xx) 452 c609719bSwdenk VIDEO_FB_LITTLE_ENDIAN graphic memory organisation 453 c609719bSwdenk (default big endian) 454 c609719bSwdenk VIDEO_HW_RECTFILL graphic chip supports 455 c609719bSwdenk rectangle fill 456 c609719bSwdenk (cf. smiLynxEM) 457 c609719bSwdenk VIDEO_HW_BITBLT graphic chip supports 458 c609719bSwdenk bit-blit (cf. smiLynxEM) 459 c609719bSwdenk VIDEO_VISIBLE_COLS visible pixel columns 460 c609719bSwdenk (cols=pitch) 461 c609719bSwdenk VIDEO_VISIBLE_ROWS visible pixel rows 462 c609719bSwdenk VIDEO_PIXEL_SIZE bytes per pixel 463 c609719bSwdenk VIDEO_DATA_FORMAT graphic data format 464 c609719bSwdenk (0-5, cf. cfb_console.c) 465 c609719bSwdenk VIDEO_FB_ADRS framebuffer address 466 c609719bSwdenk VIDEO_KBD_INIT_FCT keyboard int fct 467 c609719bSwdenk (i.e. i8042_kbd_init()) 468 c609719bSwdenk VIDEO_TSTC_FCT test char fct 469 c609719bSwdenk (i.e. i8042_tstc) 470 c609719bSwdenk VIDEO_GETC_FCT get char fct 471 c609719bSwdenk (i.e. i8042_getc) 472 c609719bSwdenk CONFIG_CONSOLE_CURSOR cursor drawing on/off 473 c609719bSwdenk (requires blink timer 474 c609719bSwdenk cf. i8042.c) 475 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_CONSOLE_BLINK_COUNT blink interval (cf. i8042.c) 476 c609719bSwdenk CONFIG_CONSOLE_TIME display time/date info in 477 c609719bSwdenk upper right corner 478 602ad3b3SJon Loeliger (requires CONFIG_CMD_DATE) 479 c609719bSwdenk CONFIG_VIDEO_LOGO display Linux logo in 480 c609719bSwdenk upper left corner 481 a6c7ad2fSwdenk CONFIG_VIDEO_BMP_LOGO use bmp_logo.h instead of 482 a6c7ad2fSwdenk linux_logo.h for logo. 483 a6c7ad2fSwdenk Requires CONFIG_VIDEO_LOGO 484 c609719bSwdenk CONFIG_CONSOLE_EXTRA_INFO 485 11ccc33fSMarcel Ziswiler additional board info beside 486 c609719bSwdenk the logo 487 c609719bSwdenk 488 c609719bSwdenk When CONFIG_CFB_CONSOLE is defined, video console is 489 c609719bSwdenk default i/o. Serial console can be forced with 490 c609719bSwdenk environment 'console=serial'. 491 c609719bSwdenk 492 a3ad8e26Swdenk When CONFIG_SILENT_CONSOLE is defined, all console 493 a3ad8e26Swdenk messages (by U-Boot and Linux!) can be silenced with 494 a3ad8e26Swdenk the "silent" environment variable. See 495 a3ad8e26Swdenk doc/README.silent for more information. 496 a3ad8e26Swdenk 497 c609719bSwdenk- Console Baudrate: 498 c609719bSwdenk CONFIG_BAUDRATE - in bps 499 c609719bSwdenk Select one of the baudrates listed in 500 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_BAUDRATE_TABLE, see below. 501 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_BRGCLK_PRESCALE, baudrate prescale 502 c609719bSwdenk 503 c92fac91SHeiko Schocher- Console Rx buffer length 504 c92fac91SHeiko Schocher With CONFIG_SYS_SMC_RXBUFLEN it is possible to define 505 c92fac91SHeiko Schocher the maximum receive buffer length for the SMC. 506 2b3f12c2SHeiko Schocher This option is actual only for 82xx and 8xx possible. 507 c92fac91SHeiko Schocher If using CONFIG_SYS_SMC_RXBUFLEN also CONFIG_SYS_MAXIDLE 508 c92fac91SHeiko Schocher must be defined, to setup the maximum idle timeout for 509 c92fac91SHeiko Schocher the SMC. 510 c92fac91SHeiko Schocher 511 c609719bSwdenk- Interrupt driven serial port input: 512 c609719bSwdenk CONFIG_SERIAL_SOFTWARE_FIFO 513 c609719bSwdenk 514 c609719bSwdenk PPC405GP only. 515 c609719bSwdenk Use an interrupt handler for receiving data on the 516 c609719bSwdenk serial port. It also enables using hardware handshake 517 c609719bSwdenk (RTS/CTS) and UART's built-in FIFO. Set the number of 518 c609719bSwdenk bytes the interrupt driven input buffer should have. 519 c609719bSwdenk 520 109c0e3aSwdenk Leave undefined to disable this feature, including 521 109c0e3aSwdenk disable the buffer and hardware handshake. 522 c609719bSwdenk 523 1d49b1f3Sstroese- Console UART Number: 524 1d49b1f3Sstroese CONFIG_UART1_CONSOLE 525 1d49b1f3Sstroese 526 0c8721a4SWolfgang Denk AMCC PPC4xx only. 527 1d49b1f3Sstroese If defined internal UART1 (and not UART0) is used 528 1d49b1f3Sstroese as default U-Boot console. 529 1d49b1f3Sstroese 530 c609719bSwdenk- Boot Delay: CONFIG_BOOTDELAY - in seconds 531 c609719bSwdenk Delay before automatically booting the default image; 532 c609719bSwdenk set to -1 to disable autoboot. 533 c609719bSwdenk 534 c609719bSwdenk See doc/README.autoboot for these options that 535 c609719bSwdenk work with CONFIG_BOOTDELAY. None are required. 536 c609719bSwdenk CONFIG_BOOT_RETRY_TIME 537 c609719bSwdenk CONFIG_BOOT_RETRY_MIN 538 c609719bSwdenk CONFIG_AUTOBOOT_KEYED 539 c609719bSwdenk CONFIG_AUTOBOOT_PROMPT 540 c609719bSwdenk CONFIG_AUTOBOOT_DELAY_STR 541 c609719bSwdenk CONFIG_AUTOBOOT_STOP_STR 542 c609719bSwdenk CONFIG_AUTOBOOT_DELAY_STR2 543 c609719bSwdenk CONFIG_AUTOBOOT_STOP_STR2 544 c609719bSwdenk CONFIG_ZERO_BOOTDELAY_CHECK 545 c609719bSwdenk CONFIG_RESET_TO_RETRY 546 c609719bSwdenk 547 c609719bSwdenk- Autoboot Command: 548 c609719bSwdenk CONFIG_BOOTCOMMAND 549 c609719bSwdenk Only needed when CONFIG_BOOTDELAY is enabled; 550 c609719bSwdenk define a command string that is automatically executed 551 c609719bSwdenk when no character is read on the console interface 552 c609719bSwdenk within "Boot Delay" after reset. 553 c609719bSwdenk 554 c609719bSwdenk CONFIG_BOOTARGS 555 c609719bSwdenk This can be used to pass arguments to the bootm 556 c609719bSwdenk command. The value of CONFIG_BOOTARGS goes into the 557 c609719bSwdenk environment value "bootargs". 558 c609719bSwdenk 559 c609719bSwdenk CONFIG_RAMBOOT and CONFIG_NFSBOOT 560 c609719bSwdenk The value of these goes into the environment as 561 c609719bSwdenk "ramboot" and "nfsboot" respectively, and can be used 562 c609719bSwdenk as a convenience, when switching between booting from 563 11ccc33fSMarcel Ziswiler RAM and NFS. 564 c609719bSwdenk 565 c609719bSwdenk- Pre-Boot Commands: 566 c609719bSwdenk CONFIG_PREBOOT 567 c609719bSwdenk 568 c609719bSwdenk When this option is #defined, the existence of the 569 c609719bSwdenk environment variable "preboot" will be checked 570 c609719bSwdenk immediately before starting the CONFIG_BOOTDELAY 571 c609719bSwdenk countdown and/or running the auto-boot command resp. 572 c609719bSwdenk entering interactive mode. 573 c609719bSwdenk 574 c609719bSwdenk This feature is especially useful when "preboot" is 575 c609719bSwdenk automatically generated or modified. For an example 576 c609719bSwdenk see the LWMON board specific code: here "preboot" is 577 c609719bSwdenk modified when the user holds down a certain 578 c609719bSwdenk combination of keys on the (special) keyboard when 579 c609719bSwdenk booting the systems 580 c609719bSwdenk 581 c609719bSwdenk- Serial Download Echo Mode: 582 c609719bSwdenk CONFIG_LOADS_ECHO 583 c609719bSwdenk If defined to 1, all characters received during a 584 c609719bSwdenk serial download (using the "loads" command) are 585 c609719bSwdenk echoed back. This might be needed by some terminal 586 c609719bSwdenk emulations (like "cu"), but may as well just take 587 c609719bSwdenk time on others. This setting #define's the initial 588 c609719bSwdenk value of the "loads_echo" environment variable. 589 c609719bSwdenk 590 602ad3b3SJon Loeliger- Kgdb Serial Baudrate: (if CONFIG_CMD_KGDB is defined) 591 c609719bSwdenk CONFIG_KGDB_BAUDRATE 592 c609719bSwdenk Select one of the baudrates listed in 593 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_BAUDRATE_TABLE, see below. 594 c609719bSwdenk 595 c609719bSwdenk- Monitor Functions: 596 602ad3b3SJon Loeliger Monitor commands can be included or excluded 597 602ad3b3SJon Loeliger from the build by using the #include files 598 602ad3b3SJon Loeliger "config_cmd_all.h" and #undef'ing unwanted 599 602ad3b3SJon Loeliger commands, or using "config_cmd_default.h" 600 602ad3b3SJon Loeliger and augmenting with additional #define's 601 602ad3b3SJon Loeliger for wanted commands. 602 c609719bSwdenk 603 602ad3b3SJon Loeliger The default command configuration includes all commands 604 602ad3b3SJon Loeliger except those marked below with a "*". 605 602ad3b3SJon Loeliger 606 602ad3b3SJon Loeliger CONFIG_CMD_ASKENV * ask for env variable 607 602ad3b3SJon Loeliger CONFIG_CMD_BDI bdinfo 608 602ad3b3SJon Loeliger CONFIG_CMD_BEDBUG * Include BedBug Debugger 609 602ad3b3SJon Loeliger CONFIG_CMD_BMP * BMP support 610 602ad3b3SJon Loeliger CONFIG_CMD_BSP * Board specific commands 611 602ad3b3SJon Loeliger CONFIG_CMD_BOOTD bootd 612 602ad3b3SJon Loeliger CONFIG_CMD_CACHE * icache, dcache 613 602ad3b3SJon Loeliger CONFIG_CMD_CONSOLE coninfo 614 602ad3b3SJon Loeliger CONFIG_CMD_DATE * support for RTC, date/time... 615 602ad3b3SJon Loeliger CONFIG_CMD_DHCP * DHCP support 616 602ad3b3SJon Loeliger CONFIG_CMD_DIAG * Diagnostics 617 a7c93104SPeter Tyser CONFIG_CMD_DS4510 * ds4510 I2C gpio commands 618 a7c93104SPeter Tyser CONFIG_CMD_DS4510_INFO * ds4510 I2C info command 619 a7c93104SPeter Tyser CONFIG_CMD_DS4510_MEM * ds4510 I2C eeprom/sram commansd 620 a7c93104SPeter Tyser CONFIG_CMD_DS4510_RST * ds4510 I2C rst command 621 602ad3b3SJon Loeliger CONFIG_CMD_DTT * Digital Therm and Thermostat 622 602ad3b3SJon Loeliger CONFIG_CMD_ECHO echo arguments 623 *246c6922SPeter Tyser CONFIG_CMD_EDITENV edit env variable 624 602ad3b3SJon Loeliger CONFIG_CMD_EEPROM * EEPROM read/write support 625 602ad3b3SJon Loeliger CONFIG_CMD_ELF * bootelf, bootvx 626 bdab39d3SMike Frysinger CONFIG_CMD_SAVEENV saveenv 627 602ad3b3SJon Loeliger CONFIG_CMD_FDC * Floppy Disk Support 628 602ad3b3SJon Loeliger CONFIG_CMD_FAT * FAT partition support 629 602ad3b3SJon Loeliger CONFIG_CMD_FDOS * Dos diskette Support 630 602ad3b3SJon Loeliger CONFIG_CMD_FLASH flinfo, erase, protect 631 602ad3b3SJon Loeliger CONFIG_CMD_FPGA FPGA device initialization support 632 602ad3b3SJon Loeliger CONFIG_CMD_HWFLOW * RTS/CTS hw flow control 633 602ad3b3SJon Loeliger CONFIG_CMD_I2C * I2C serial bus support 634 602ad3b3SJon Loeliger CONFIG_CMD_IDE * IDE harddisk support 635 602ad3b3SJon Loeliger CONFIG_CMD_IMI iminfo 636 602ad3b3SJon Loeliger CONFIG_CMD_IMLS List all found images 637 602ad3b3SJon Loeliger CONFIG_CMD_IMMAP * IMMR dump support 638 602ad3b3SJon Loeliger CONFIG_CMD_IRQ * irqinfo 639 602ad3b3SJon Loeliger CONFIG_CMD_ITEST Integer/string test of 2 values 640 602ad3b3SJon Loeliger CONFIG_CMD_JFFS2 * JFFS2 Support 641 602ad3b3SJon Loeliger CONFIG_CMD_KGDB * kgdb 642 602ad3b3SJon Loeliger CONFIG_CMD_LOADB loadb 643 602ad3b3SJon Loeliger CONFIG_CMD_LOADS loads 644 02c9aa1dSRobin Getz CONFIG_CMD_MD5SUM print md5 message digest 645 02c9aa1dSRobin Getz (requires CONFIG_CMD_MEMORY and CONFIG_MD5) 646 602ad3b3SJon Loeliger CONFIG_CMD_MEMORY md, mm, nm, mw, cp, cmp, crc, base, 647 56523f12Swdenk loop, loopw, mtest 648 602ad3b3SJon Loeliger CONFIG_CMD_MISC Misc functions like sleep etc 649 602ad3b3SJon Loeliger CONFIG_CMD_MMC * MMC memory mapped support 650 602ad3b3SJon Loeliger CONFIG_CMD_MII * MII utility commands 651 68d7d651SStefan Roese CONFIG_CMD_MTDPARTS * MTD partition support 652 602ad3b3SJon Loeliger CONFIG_CMD_NAND * NAND support 653 602ad3b3SJon Loeliger CONFIG_CMD_NET bootp, tftpboot, rarpboot 654 e92739d3SPeter Tyser CONFIG_CMD_PCA953X * PCA953x I2C gpio commands 655 e92739d3SPeter Tyser CONFIG_CMD_PCA953X_INFO * PCA953x I2C gpio info command 656 602ad3b3SJon Loeliger CONFIG_CMD_PCI * pciinfo 657 602ad3b3SJon Loeliger CONFIG_CMD_PCMCIA * PCMCIA support 658 602ad3b3SJon Loeliger CONFIG_CMD_PING * send ICMP ECHO_REQUEST to network 659 602ad3b3SJon Loeliger host 660 602ad3b3SJon Loeliger CONFIG_CMD_PORTIO * Port I/O 661 602ad3b3SJon Loeliger CONFIG_CMD_REGINFO * Register dump 662 602ad3b3SJon Loeliger CONFIG_CMD_RUN run command in env variable 663 602ad3b3SJon Loeliger CONFIG_CMD_SAVES * save S record dump 664 602ad3b3SJon Loeliger CONFIG_CMD_SCSI * SCSI Support 665 602ad3b3SJon Loeliger CONFIG_CMD_SDRAM * print SDRAM configuration information 666 602ad3b3SJon Loeliger (requires CONFIG_CMD_I2C) 667 602ad3b3SJon Loeliger CONFIG_CMD_SETGETDCR Support for DCR Register access 668 602ad3b3SJon Loeliger (4xx only) 669 02c9aa1dSRobin Getz CONFIG_CMD_SHA1 print sha1 memory digest 670 02c9aa1dSRobin Getz (requires CONFIG_CMD_MEMORY) 671 74de7aefSWolfgang Denk CONFIG_CMD_SOURCE "source" command Support 672 602ad3b3SJon Loeliger CONFIG_CMD_SPI * SPI serial bus support 673 602ad3b3SJon Loeliger CONFIG_CMD_USB * USB support 674 602ad3b3SJon Loeliger CONFIG_CMD_VFD * VFD support (TRAB) 675 602ad3b3SJon Loeliger CONFIG_CMD_CDP * Cisco Discover Protocol support 676 602ad3b3SJon Loeliger CONFIG_CMD_FSL * Microblaze FSL support 677 c609719bSwdenk 678 c609719bSwdenk 679 c609719bSwdenk EXAMPLE: If you want all functions except of network 680 c609719bSwdenk support you can write: 681 c609719bSwdenk 682 602ad3b3SJon Loeliger #include "config_cmd_all.h" 683 602ad3b3SJon Loeliger #undef CONFIG_CMD_NET 684 c609719bSwdenk 685 213bf8c8SGerald Van Baren Other Commands: 686 213bf8c8SGerald Van Baren fdt (flattened device tree) command: CONFIG_OF_LIBFDT 687 c609719bSwdenk 688 c609719bSwdenk Note: Don't enable the "icache" and "dcache" commands 689 602ad3b3SJon Loeliger (configuration option CONFIG_CMD_CACHE) unless you know 690 c609719bSwdenk what you (and your U-Boot users) are doing. Data 691 c609719bSwdenk cache cannot be enabled on systems like the 8xx or 692 c609719bSwdenk 8260 (where accesses to the IMMR region must be 693 c609719bSwdenk uncached), and it cannot be disabled on all other 694 c609719bSwdenk systems where we (mis-) use the data cache to hold an 695 c609719bSwdenk initial stack and some data. 696 c609719bSwdenk 697 c609719bSwdenk 698 c609719bSwdenk XXX - this list needs to get updated! 699 c609719bSwdenk 700 c609719bSwdenk- Watchdog: 701 c609719bSwdenk CONFIG_WATCHDOG 702 c609719bSwdenk If this variable is defined, it enables watchdog 703 7152b1d0Swdenk support. There must be support in the platform specific 704 c609719bSwdenk code for a watchdog. For the 8xx and 8260 CPUs, the 705 c609719bSwdenk SIU Watchdog feature is enabled in the SYPCR 706 c609719bSwdenk register. 707 c609719bSwdenk 708 c1551ea8Sstroese- U-Boot Version: 709 c1551ea8Sstroese CONFIG_VERSION_VARIABLE 710 c1551ea8Sstroese If this variable is defined, an environment variable 711 c1551ea8Sstroese named "ver" is created by U-Boot showing the U-Boot 712 c1551ea8Sstroese version as printed by the "version" command. 713 c1551ea8Sstroese This variable is readonly. 714 c1551ea8Sstroese 715 c609719bSwdenk- Real-Time Clock: 716 c609719bSwdenk 717 602ad3b3SJon Loeliger When CONFIG_CMD_DATE is selected, the type of the RTC 718 c609719bSwdenk has to be selected, too. Define exactly one of the 719 c609719bSwdenk following options: 720 c609719bSwdenk 721 c609719bSwdenk CONFIG_RTC_MPC8xx - use internal RTC of MPC8xx 722 c609719bSwdenk CONFIG_RTC_PCF8563 - use Philips PCF8563 RTC 723 7ce63709SGuennadi Liakhovetski CONFIG_RTC_MC13783 - use MC13783 RTC 724 c609719bSwdenk CONFIG_RTC_MC146818 - use MC146818 RTC 725 1cb8e980Swdenk CONFIG_RTC_DS1307 - use Maxim, Inc. DS1307 RTC 726 c609719bSwdenk CONFIG_RTC_DS1337 - use Maxim, Inc. DS1337 RTC 727 7f70e853Swdenk CONFIG_RTC_DS1338 - use Maxim, Inc. DS1338 RTC 728 3bac3513Swdenk CONFIG_RTC_DS164x - use Dallas DS164x RTC 729 9536dfccSTor Krill CONFIG_RTC_ISL1208 - use Intersil ISL1208 RTC 730 4c0d4c3bSwdenk CONFIG_RTC_MAX6900 - use Maxim, Inc. MAX6900 RTC 731 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_RTC_DS1337_NOOSC - Turn off the OSC output for DS1337 732 c609719bSwdenk 733 b37c7e5eSwdenk Note that if the RTC uses I2C, then the I2C interface 734 b37c7e5eSwdenk must also be configured. See I2C Support, below. 735 b37c7e5eSwdenk 736 e92739d3SPeter Tyser- GPIO Support: 737 e92739d3SPeter Tyser CONFIG_PCA953X - use NXP's PCA953X series I2C GPIO 738 e92739d3SPeter Tyser CONFIG_PCA953X_INFO - enable pca953x info command 739 e92739d3SPeter Tyser 740 e92739d3SPeter Tyser Note that if the GPIO device uses I2C, then the I2C interface 741 e92739d3SPeter Tyser must also be configured. See I2C Support, below. 742 e92739d3SPeter Tyser 743 c609719bSwdenk- Timestamp Support: 744 c609719bSwdenk 745 c609719bSwdenk When CONFIG_TIMESTAMP is selected, the timestamp 746 c609719bSwdenk (date and time) of an image is printed by image 747 c609719bSwdenk commands like bootm or iminfo. This option is 748 602ad3b3SJon Loeliger automatically enabled when you select CONFIG_CMD_DATE . 749 c609719bSwdenk 750 c609719bSwdenk- Partition Support: 751 c609719bSwdenk CONFIG_MAC_PARTITION and/or CONFIG_DOS_PARTITION 752 07f3d789Srichardretanubun and/or CONFIG_ISO_PARTITION and/or CONFIG_EFI_PARTITION 753 c609719bSwdenk 754 602ad3b3SJon Loeliger If IDE or SCSI support is enabled (CONFIG_CMD_IDE or 755 218ca724SWolfgang Denk CONFIG_CMD_SCSI) you must configure support for at 756 218ca724SWolfgang Denk least one partition type as well. 757 c609719bSwdenk 758 c609719bSwdenk- IDE Reset method: 759 4d13cbadSwdenk CONFIG_IDE_RESET_ROUTINE - this is defined in several 760 4d13cbadSwdenk board configurations files but used nowhere! 761 c609719bSwdenk 762 4d13cbadSwdenk CONFIG_IDE_RESET - is this is defined, IDE Reset will 763 4d13cbadSwdenk be performed by calling the function 764 4d13cbadSwdenk ide_set_reset(int reset) 765 4d13cbadSwdenk which has to be defined in a board specific file 766 c609719bSwdenk 767 c609719bSwdenk- ATAPI Support: 768 c609719bSwdenk CONFIG_ATAPI 769 c609719bSwdenk 770 c609719bSwdenk Set this to enable ATAPI support. 771 c609719bSwdenk 772 c40b2956Swdenk- LBA48 Support 773 c40b2956Swdenk CONFIG_LBA48 774 c40b2956Swdenk 775 c40b2956Swdenk Set this to enable support for disks larger than 137GB 776 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD Also look at CONFIG_SYS_64BIT_LBA ,CONFIG_SYS_64BIT_VSPRINTF and CONFIG_SYS_64BIT_STRTOUL 777 c40b2956Swdenk Whithout these , LBA48 support uses 32bit variables and will 'only' 778 c40b2956Swdenk support disks up to 2.1TB. 779 c40b2956Swdenk 780 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_64BIT_LBA: 781 c40b2956Swdenk When enabled, makes the IDE subsystem use 64bit sector addresses. 782 c40b2956Swdenk Default is 32bit. 783 c40b2956Swdenk 784 c609719bSwdenk- SCSI Support: 785 c609719bSwdenk At the moment only there is only support for the 786 c609719bSwdenk SYM53C8XX SCSI controller; define 787 c609719bSwdenk CONFIG_SCSI_SYM53C8XX to enable it. 788 c609719bSwdenk 789 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_SCSI_MAX_LUN [8], CONFIG_SYS_SCSI_MAX_SCSI_ID [7] and 790 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_SCSI_MAX_DEVICE [CONFIG_SYS_SCSI_MAX_SCSI_ID * 791 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_SCSI_MAX_LUN] can be adjusted to define the 792 c609719bSwdenk maximum numbers of LUNs, SCSI ID's and target 793 c609719bSwdenk devices. 794 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_SCSI_SYM53C8XX_CCF to fix clock timing (80Mhz) 795 c609719bSwdenk 796 c609719bSwdenk- NETWORK Support (PCI): 797 682011ffSwdenk CONFIG_E1000 798 682011ffSwdenk Support for Intel 8254x gigabit chips. 799 682011ffSwdenk 800 ac3315c2SAndre Schwarz CONFIG_E1000_FALLBACK_MAC 801 11ccc33fSMarcel Ziswiler default MAC for empty EEPROM after production. 802 ac3315c2SAndre Schwarz 803 c609719bSwdenk CONFIG_EEPRO100 804 c609719bSwdenk Support for Intel 82557/82559/82559ER chips. 805 11ccc33fSMarcel Ziswiler Optional CONFIG_EEPRO100_SROM_WRITE enables EEPROM 806 c609719bSwdenk write routine for first time initialisation. 807 c609719bSwdenk 808 c609719bSwdenk CONFIG_TULIP 809 c609719bSwdenk Support for Digital 2114x chips. 810 c609719bSwdenk Optional CONFIG_TULIP_SELECT_MEDIA for board specific 811 c609719bSwdenk modem chip initialisation (KS8761/QS6611). 812 c609719bSwdenk 813 c609719bSwdenk CONFIG_NATSEMI 814 c609719bSwdenk Support for National dp83815 chips. 815 c609719bSwdenk 816 c609719bSwdenk CONFIG_NS8382X 817 c609719bSwdenk Support for National dp8382[01] gigabit chips. 818 c609719bSwdenk 819 45219c46Swdenk- NETWORK Support (other): 820 45219c46Swdenk 821 45219c46Swdenk CONFIG_DRIVER_LAN91C96 822 45219c46Swdenk Support for SMSC's LAN91C96 chips. 823 45219c46Swdenk 824 45219c46Swdenk CONFIG_LAN91C96_BASE 825 45219c46Swdenk Define this to hold the physical address 826 45219c46Swdenk of the LAN91C96's I/O space 827 45219c46Swdenk 828 45219c46Swdenk CONFIG_LAN91C96_USE_32_BIT 829 45219c46Swdenk Define this to enable 32 bit addressing 830 45219c46Swdenk 831 f39748aeSwdenk CONFIG_DRIVER_SMC91111 832 f39748aeSwdenk Support for SMSC's LAN91C111 chip 833 f39748aeSwdenk 834 f39748aeSwdenk CONFIG_SMC91111_BASE 835 f39748aeSwdenk Define this to hold the physical address 836 f39748aeSwdenk of the device (I/O space) 837 f39748aeSwdenk 838 f39748aeSwdenk CONFIG_SMC_USE_32_BIT 839 f39748aeSwdenk Define this if data bus is 32 bits 840 f39748aeSwdenk 841 f39748aeSwdenk CONFIG_SMC_USE_IOFUNCS 842 f39748aeSwdenk Define this to use i/o functions instead of macros 843 f39748aeSwdenk (some hardware wont work with macros) 844 f39748aeSwdenk 845 557b377dSJens Gehrlein CONFIG_DRIVER_SMC911X 846 557b377dSJens Gehrlein Support for SMSC's LAN911x and LAN921x chips 847 557b377dSJens Gehrlein 848 557b377dSJens Gehrlein CONFIG_DRIVER_SMC911X_BASE 849 557b377dSJens Gehrlein Define this to hold the physical address 850 557b377dSJens Gehrlein of the device (I/O space) 851 557b377dSJens Gehrlein 852 557b377dSJens Gehrlein CONFIG_DRIVER_SMC911X_32_BIT 853 557b377dSJens Gehrlein Define this if data bus is 32 bits 854 557b377dSJens Gehrlein 855 557b377dSJens Gehrlein CONFIG_DRIVER_SMC911X_16_BIT 856 557b377dSJens Gehrlein Define this if data bus is 16 bits. If your processor 857 557b377dSJens Gehrlein automatically converts one 32 bit word to two 16 bit 858 557b377dSJens Gehrlein words you may also try CONFIG_DRIVER_SMC911X_32_BIT. 859 557b377dSJens Gehrlein 860 c609719bSwdenk- USB Support: 861 c609719bSwdenk At the moment only the UHCI host controller is 862 4d13cbadSwdenk supported (PIP405, MIP405, MPC5200); define 863 c609719bSwdenk CONFIG_USB_UHCI to enable it. 864 c609719bSwdenk define CONFIG_USB_KEYBOARD to enable the USB Keyboard 865 30d56faeSwdenk and define CONFIG_USB_STORAGE to enable the USB 866 c609719bSwdenk storage devices. 867 c609719bSwdenk Note: 868 c609719bSwdenk Supported are USB Keyboards and USB Floppy drives 869 c609719bSwdenk (TEAC FD-05PUB). 870 4d13cbadSwdenk MPC5200 USB requires additional defines: 871 4d13cbadSwdenk CONFIG_USB_CLOCK 872 4d13cbadSwdenk for 528 MHz Clock: 0x0001bbbb 873 307ecb6dSEric Millbrandt CONFIG_PSC3_USB 874 307ecb6dSEric Millbrandt for USB on PSC3 875 4d13cbadSwdenk CONFIG_USB_CONFIG 876 4d13cbadSwdenk for differential drivers: 0x00001000 877 4d13cbadSwdenk for single ended drivers: 0x00005000 878 307ecb6dSEric Millbrandt for differential drivers on PSC3: 0x00000100 879 307ecb6dSEric Millbrandt for single ended drivers on PSC3: 0x00004100 880 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_USB_EVENT_POLL 881 fdcfaa1bSZhang Wei May be defined to allow interrupt polling 882 fdcfaa1bSZhang Wei instead of using asynchronous interrupts 883 4d13cbadSwdenk 884 16c8d5e7SWolfgang Denk- USB Device: 885 16c8d5e7SWolfgang Denk Define the below if you wish to use the USB console. 886 16c8d5e7SWolfgang Denk Once firmware is rebuilt from a serial console issue the 887 16c8d5e7SWolfgang Denk command "setenv stdin usbtty; setenv stdout usbtty" and 888 11ccc33fSMarcel Ziswiler attach your USB cable. The Unix command "dmesg" should print 889 16c8d5e7SWolfgang Denk it has found a new device. The environment variable usbtty 890 16c8d5e7SWolfgang Denk can be set to gserial or cdc_acm to enable your device to 891 16c8d5e7SWolfgang Denk appear to a USB host as a Linux gserial device or a 892 16c8d5e7SWolfgang Denk Common Device Class Abstract Control Model serial device. 893 16c8d5e7SWolfgang Denk If you select usbtty = gserial you should be able to enumerate 894 16c8d5e7SWolfgang Denk a Linux host by 895 16c8d5e7SWolfgang Denk # modprobe usbserial vendor=0xVendorID product=0xProductID 896 16c8d5e7SWolfgang Denk else if using cdc_acm, simply setting the environment 897 16c8d5e7SWolfgang Denk variable usbtty to be cdc_acm should suffice. The following 898 16c8d5e7SWolfgang Denk might be defined in YourBoardName.h 899 16c8d5e7SWolfgang Denk 900 16c8d5e7SWolfgang Denk CONFIG_USB_DEVICE 901 16c8d5e7SWolfgang Denk Define this to build a UDC device 902 16c8d5e7SWolfgang Denk 903 16c8d5e7SWolfgang Denk CONFIG_USB_TTY 904 16c8d5e7SWolfgang Denk Define this to have a tty type of device available to 905 16c8d5e7SWolfgang Denk talk to the UDC device 906 16c8d5e7SWolfgang Denk 907 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_CONSOLE_IS_IN_ENV 908 16c8d5e7SWolfgang Denk Define this if you want stdin, stdout &/or stderr to 909 16c8d5e7SWolfgang Denk be set to usbtty. 910 16c8d5e7SWolfgang Denk 911 16c8d5e7SWolfgang Denk mpc8xx: 912 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_USB_EXTC_CLK 0xBLAH 913 16c8d5e7SWolfgang Denk Derive USB clock from external clock "blah" 914 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD - CONFIG_SYS_USB_EXTC_CLK 0x02 915 16c8d5e7SWolfgang Denk 916 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_USB_BRG_CLK 0xBLAH 917 16c8d5e7SWolfgang Denk Derive USB clock from brgclk 918 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD - CONFIG_SYS_USB_BRG_CLK 0x04 919 16c8d5e7SWolfgang Denk 920 16c8d5e7SWolfgang Denk If you have a USB-IF assigned VendorID then you may wish to 921 16c8d5e7SWolfgang Denk define your own vendor specific values either in BoardName.h 922 16c8d5e7SWolfgang Denk or directly in usbd_vendor_info.h. If you don't define 923 16c8d5e7SWolfgang Denk CONFIG_USBD_MANUFACTURER, CONFIG_USBD_PRODUCT_NAME, 924 16c8d5e7SWolfgang Denk CONFIG_USBD_VENDORID and CONFIG_USBD_PRODUCTID, then U-Boot 925 16c8d5e7SWolfgang Denk should pretend to be a Linux device to it's target host. 926 16c8d5e7SWolfgang Denk 927 16c8d5e7SWolfgang Denk CONFIG_USBD_MANUFACTURER 928 16c8d5e7SWolfgang Denk Define this string as the name of your company for 929 16c8d5e7SWolfgang Denk - CONFIG_USBD_MANUFACTURER "my company" 930 16c8d5e7SWolfgang Denk 931 16c8d5e7SWolfgang Denk CONFIG_USBD_PRODUCT_NAME 932 16c8d5e7SWolfgang Denk Define this string as the name of your product 933 16c8d5e7SWolfgang Denk - CONFIG_USBD_PRODUCT_NAME "acme usb device" 934 16c8d5e7SWolfgang Denk 935 16c8d5e7SWolfgang Denk CONFIG_USBD_VENDORID 936 16c8d5e7SWolfgang Denk Define this as your assigned Vendor ID from the USB 937 16c8d5e7SWolfgang Denk Implementors Forum. This *must* be a genuine Vendor ID 938 16c8d5e7SWolfgang Denk to avoid polluting the USB namespace. 939 16c8d5e7SWolfgang Denk - CONFIG_USBD_VENDORID 0xFFFF 940 16c8d5e7SWolfgang Denk 941 16c8d5e7SWolfgang Denk CONFIG_USBD_PRODUCTID 942 16c8d5e7SWolfgang Denk Define this as the unique Product ID 943 16c8d5e7SWolfgang Denk for your device 944 16c8d5e7SWolfgang Denk - CONFIG_USBD_PRODUCTID 0xFFFF 945 c609719bSwdenk 946 c609719bSwdenk 947 c609719bSwdenk- MMC Support: 948 c609719bSwdenk The MMC controller on the Intel PXA is supported. To 949 c609719bSwdenk enable this define CONFIG_MMC. The MMC can be 950 c609719bSwdenk accessed from the boot prompt by mapping the device 951 c609719bSwdenk to physical memory similar to flash. Command line is 952 602ad3b3SJon Loeliger enabled with CONFIG_CMD_MMC. The MMC driver also works with 953 602ad3b3SJon Loeliger the FAT fs. This is enabled with CONFIG_CMD_FAT. 954 c609719bSwdenk 955 6705d81eSwdenk- Journaling Flash filesystem support: 956 6705d81eSwdenk CONFIG_JFFS2_NAND, CONFIG_JFFS2_NAND_OFF, CONFIG_JFFS2_NAND_SIZE, 957 6705d81eSwdenk CONFIG_JFFS2_NAND_DEV 958 6705d81eSwdenk Define these for a default partition on a NAND device 959 6705d81eSwdenk 960 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_JFFS2_FIRST_SECTOR, 961 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_JFFS2_FIRST_BANK, CONFIG_SYS_JFFS2_NUM_BANKS 962 6705d81eSwdenk Define these for a default partition on a NOR device 963 6705d81eSwdenk 964 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_JFFS_CUSTOM_PART 965 6705d81eSwdenk Define this to create an own partition. You have to provide a 966 6705d81eSwdenk function struct part_info* jffs2_part_info(int part_num) 967 6705d81eSwdenk 968 6705d81eSwdenk If you define only one JFFS2 partition you may also want to 969 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD #define CONFIG_SYS_JFFS_SINGLE_PART 1 970 6705d81eSwdenk to disable the command chpart. This is the default when you 971 6705d81eSwdenk have not defined a custom partition 972 6705d81eSwdenk 973 c609719bSwdenk- Keyboard Support: 974 c609719bSwdenk CONFIG_ISA_KEYBOARD 975 c609719bSwdenk 976 c609719bSwdenk Define this to enable standard (PC-Style) keyboard 977 c609719bSwdenk support 978 c609719bSwdenk 979 c609719bSwdenk CONFIG_I8042_KBD 980 c609719bSwdenk Standard PC keyboard driver with US (is default) and 981 c609719bSwdenk GERMAN key layout (switch via environment 'keymap=de') support. 982 c609719bSwdenk Export function i8042_kbd_init, i8042_tstc and i8042_getc 983 c609719bSwdenk for cfb_console. Supports cursor blinking. 984 c609719bSwdenk 985 c609719bSwdenk- Video support: 986 c609719bSwdenk CONFIG_VIDEO 987 c609719bSwdenk 988 c609719bSwdenk Define this to enable video support (for output to 989 c609719bSwdenk video). 990 c609719bSwdenk 991 c609719bSwdenk CONFIG_VIDEO_CT69000 992 c609719bSwdenk 993 c609719bSwdenk Enable Chips & Technologies 69000 Video chip 994 c609719bSwdenk 995 c609719bSwdenk CONFIG_VIDEO_SMI_LYNXEM 996 eeb1b77bSwdenk Enable Silicon Motion SMI 712/710/810 Video chip. The 997 eeb1b77bSwdenk video output is selected via environment 'videoout' 998 eeb1b77bSwdenk (1 = LCD and 2 = CRT). If videoout is undefined, CRT is 999 eeb1b77bSwdenk assumed. 1000 c609719bSwdenk 1001 eeb1b77bSwdenk For the CT69000 and SMI_LYNXEM drivers, videomode is 1002 11ccc33fSMarcel Ziswiler selected via environment 'videomode'. Two different ways 1003 eeb1b77bSwdenk are possible: 1004 eeb1b77bSwdenk - "videomode=num" 'num' is a standard LiLo mode numbers. 1005 eeb1b77bSwdenk Following standard modes are supported (* is default): 1006 eeb1b77bSwdenk 1007 eeb1b77bSwdenk Colors 640x480 800x600 1024x768 1152x864 1280x1024 1008 eeb1b77bSwdenk -------------+--------------------------------------------- 1009 eeb1b77bSwdenk 8 bits | 0x301* 0x303 0x305 0x161 0x307 1010 eeb1b77bSwdenk 15 bits | 0x310 0x313 0x316 0x162 0x319 1011 eeb1b77bSwdenk 16 bits | 0x311 0x314 0x317 0x163 0x31A 1012 eeb1b77bSwdenk 24 bits | 0x312 0x315 0x318 ? 0x31B 1013 eeb1b77bSwdenk -------------+--------------------------------------------- 1014 c609719bSwdenk (i.e. setenv videomode 317; saveenv; reset;) 1015 c609719bSwdenk 1016 eeb1b77bSwdenk - "videomode=bootargs" all the video parameters are parsed 1017 7817cb20SMarcel Ziswiler from the bootargs. (See drivers/video/videomodes.c) 1018 eeb1b77bSwdenk 1019 eeb1b77bSwdenk 1020 a6c7ad2fSwdenk CONFIG_VIDEO_SED13806 1021 a6c7ad2fSwdenk Enable Epson SED13806 driver. This driver supports 8bpp 1022 a6c7ad2fSwdenk and 16bpp modes defined by CONFIG_VIDEO_SED13806_8BPP 1023 a6c7ad2fSwdenk or CONFIG_VIDEO_SED13806_16BPP 1024 a6c7ad2fSwdenk 1025 682011ffSwdenk- Keyboard Support: 1026 682011ffSwdenk CONFIG_KEYBOARD 1027 682011ffSwdenk 1028 682011ffSwdenk Define this to enable a custom keyboard support. 1029 682011ffSwdenk This simply calls drv_keyboard_init() which must be 1030 682011ffSwdenk defined in your board-specific files. 1031 682011ffSwdenk The only board using this so far is RBC823. 1032 a6c7ad2fSwdenk 1033 c609719bSwdenk- LCD Support: CONFIG_LCD 1034 c609719bSwdenk 1035 c609719bSwdenk Define this to enable LCD support (for output to LCD 1036 c609719bSwdenk display); also select one of the supported displays 1037 c609719bSwdenk by defining one of these: 1038 c609719bSwdenk 1039 39cf4804SStelian Pop CONFIG_ATMEL_LCD: 1040 39cf4804SStelian Pop 1041 39cf4804SStelian Pop HITACHI TX09D70VM1CCA, 3.5", 240x320. 1042 39cf4804SStelian Pop 1043 fd3103bbSwdenk CONFIG_NEC_NL6448AC33: 1044 c609719bSwdenk 1045 fd3103bbSwdenk NEC NL6448AC33-18. Active, color, single scan. 1046 c609719bSwdenk 1047 fd3103bbSwdenk CONFIG_NEC_NL6448BC20 1048 c609719bSwdenk 1049 fd3103bbSwdenk NEC NL6448BC20-08. 6.5", 640x480. 1050 fd3103bbSwdenk Active, color, single scan. 1051 fd3103bbSwdenk 1052 fd3103bbSwdenk CONFIG_NEC_NL6448BC33_54 1053 fd3103bbSwdenk 1054 fd3103bbSwdenk NEC NL6448BC33-54. 10.4", 640x480. 1055 c609719bSwdenk Active, color, single scan. 1056 c609719bSwdenk 1057 c609719bSwdenk CONFIG_SHARP_16x9 1058 c609719bSwdenk 1059 c609719bSwdenk Sharp 320x240. Active, color, single scan. 1060 c609719bSwdenk It isn't 16x9, and I am not sure what it is. 1061 c609719bSwdenk 1062 c609719bSwdenk CONFIG_SHARP_LQ64D341 1063 c609719bSwdenk 1064 c609719bSwdenk Sharp LQ64D341 display, 640x480. 1065 c609719bSwdenk Active, color, single scan. 1066 c609719bSwdenk 1067 c609719bSwdenk CONFIG_HLD1045 1068 c609719bSwdenk 1069 c609719bSwdenk HLD1045 display, 640x480. 1070 c609719bSwdenk Active, color, single scan. 1071 c609719bSwdenk 1072 c609719bSwdenk CONFIG_OPTREX_BW 1073 c609719bSwdenk 1074 c609719bSwdenk Optrex CBL50840-2 NF-FW 99 22 M5 1075 c609719bSwdenk or 1076 c609719bSwdenk Hitachi LMG6912RPFC-00T 1077 c609719bSwdenk or 1078 c609719bSwdenk Hitachi SP14Q002 1079 c609719bSwdenk 1080 c609719bSwdenk 320x240. Black & white. 1081 c609719bSwdenk 1082 c609719bSwdenk Normally display is black on white background; define 1083 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_WHITE_ON_BLACK to get it inverted. 1084 c609719bSwdenk 1085 7152b1d0Swdenk- Splash Screen Support: CONFIG_SPLASH_SCREEN 1086 d791b1dcSwdenk 1087 d791b1dcSwdenk If this option is set, the environment is checked for 1088 d791b1dcSwdenk a variable "splashimage". If found, the usual display 1089 d791b1dcSwdenk of logo, copyright and system information on the LCD 1090 e94d2cd9Swdenk is suppressed and the BMP image at the address 1091 d791b1dcSwdenk specified in "splashimage" is loaded instead. The 1092 d791b1dcSwdenk console is redirected to the "nulldev", too. This 1093 d791b1dcSwdenk allows for a "silent" boot where a splash screen is 1094 d791b1dcSwdenk loaded very quickly after power-on. 1095 d791b1dcSwdenk 1096 1ca298ceSMatthias Weisser CONFIG_SPLASH_SCREEN_ALIGN 1097 1ca298ceSMatthias Weisser 1098 1ca298ceSMatthias Weisser If this option is set the splash image can be freely positioned 1099 1ca298ceSMatthias Weisser on the screen. Environment variable "splashpos" specifies the 1100 1ca298ceSMatthias Weisser position as "x,y". If a positive number is given it is used as 1101 1ca298ceSMatthias Weisser number of pixel from left/top. If a negative number is given it 1102 1ca298ceSMatthias Weisser is used as number of pixel from right/bottom. You can also 1103 1ca298ceSMatthias Weisser specify 'm' for centering the image. 1104 1ca298ceSMatthias Weisser 1105 1ca298ceSMatthias Weisser Example: 1106 1ca298ceSMatthias Weisser setenv splashpos m,m 1107 1ca298ceSMatthias Weisser => image at center of screen 1108 1ca298ceSMatthias Weisser 1109 1ca298ceSMatthias Weisser setenv splashpos 30,20 1110 1ca298ceSMatthias Weisser => image at x = 30 and y = 20 1111 1ca298ceSMatthias Weisser 1112 1ca298ceSMatthias Weisser setenv splashpos -10,m 1113 1ca298ceSMatthias Weisser => vertically centered image 1114 1ca298ceSMatthias Weisser at x = dspWidth - bmpWidth - 9 1115 1ca298ceSMatthias Weisser 1116 98f4a3dfSStefan Roese- Gzip compressed BMP image support: CONFIG_VIDEO_BMP_GZIP 1117 98f4a3dfSStefan Roese 1118 98f4a3dfSStefan Roese If this option is set, additionally to standard BMP 1119 98f4a3dfSStefan Roese images, gzipped BMP images can be displayed via the 1120 98f4a3dfSStefan Roese splashscreen support or the bmp command. 1121 98f4a3dfSStefan Roese 1122 c29fdfc1Swdenk- Compression support: 1123 c29fdfc1Swdenk CONFIG_BZIP2 1124 c29fdfc1Swdenk 1125 c29fdfc1Swdenk If this option is set, support for bzip2 compressed 1126 c29fdfc1Swdenk images is included. If not, only uncompressed and gzip 1127 c29fdfc1Swdenk compressed images are supported. 1128 c29fdfc1Swdenk 1129 c29fdfc1Swdenk NOTE: the bzip2 algorithm requires a lot of RAM, so 1130 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD the malloc area (as defined by CONFIG_SYS_MALLOC_LEN) should 1131 c29fdfc1Swdenk be at least 4MB. 1132 d791b1dcSwdenk 1133 fc9c1727SLuigi 'Comio' Mantellini CONFIG_LZMA 1134 fc9c1727SLuigi 'Comio' Mantellini 1135 fc9c1727SLuigi 'Comio' Mantellini If this option is set, support for lzma compressed 1136 fc9c1727SLuigi 'Comio' Mantellini images is included. 1137 fc9c1727SLuigi 'Comio' Mantellini 1138 fc9c1727SLuigi 'Comio' Mantellini Note: The LZMA algorithm adds between 2 and 4KB of code and it 1139 fc9c1727SLuigi 'Comio' Mantellini requires an amount of dynamic memory that is given by the 1140 fc9c1727SLuigi 'Comio' Mantellini formula: 1141 fc9c1727SLuigi 'Comio' Mantellini 1142 fc9c1727SLuigi 'Comio' Mantellini (1846 + 768 << (lc + lp)) * sizeof(uint16) 1143 fc9c1727SLuigi 'Comio' Mantellini 1144 fc9c1727SLuigi 'Comio' Mantellini Where lc and lp stand for, respectively, Literal context bits 1145 fc9c1727SLuigi 'Comio' Mantellini and Literal pos bits. 1146 fc9c1727SLuigi 'Comio' Mantellini 1147 fc9c1727SLuigi 'Comio' Mantellini This value is upper-bounded by 14MB in the worst case. Anyway, 1148 fc9c1727SLuigi 'Comio' Mantellini for a ~4MB large kernel image, we have lc=3 and lp=0 for a 1149 fc9c1727SLuigi 'Comio' Mantellini total amount of (1846 + 768 << (3 + 0)) * 2 = ~41KB... that is 1150 fc9c1727SLuigi 'Comio' Mantellini a very small buffer. 1151 fc9c1727SLuigi 'Comio' Mantellini 1152 fc9c1727SLuigi 'Comio' Mantellini Use the lzmainfo tool to determinate the lc and lp values and 1153 fc9c1727SLuigi 'Comio' Mantellini then calculate the amount of needed dynamic memory (ensuring 1154 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD the appropriate CONFIG_SYS_MALLOC_LEN value). 1155 fc9c1727SLuigi 'Comio' Mantellini 1156 17ea1177Swdenk- MII/PHY support: 1157 17ea1177Swdenk CONFIG_PHY_ADDR 1158 17ea1177Swdenk 1159 17ea1177Swdenk The address of PHY on MII bus. 1160 17ea1177Swdenk 1161 17ea1177Swdenk CONFIG_PHY_CLOCK_FREQ (ppc4xx) 1162 17ea1177Swdenk 1163 17ea1177Swdenk The clock frequency of the MII bus 1164 17ea1177Swdenk 1165 17ea1177Swdenk CONFIG_PHY_GIGE 1166 17ea1177Swdenk 1167 17ea1177Swdenk If this option is set, support for speed/duplex 1168 11ccc33fSMarcel Ziswiler detection of gigabit PHY is included. 1169 17ea1177Swdenk 1170 17ea1177Swdenk CONFIG_PHY_RESET_DELAY 1171 17ea1177Swdenk 1172 17ea1177Swdenk Some PHY like Intel LXT971A need extra delay after 1173 17ea1177Swdenk reset before any MII register access is possible. 1174 17ea1177Swdenk For such PHY, set this option to the usec delay 1175 17ea1177Swdenk required. (minimum 300usec for LXT971A) 1176 17ea1177Swdenk 1177 17ea1177Swdenk CONFIG_PHY_CMD_DELAY (ppc4xx) 1178 17ea1177Swdenk 1179 17ea1177Swdenk Some PHY like Intel LXT971A need extra delay after 1180 17ea1177Swdenk command issued before MII status register can be read 1181 17ea1177Swdenk 1182 c609719bSwdenk- Ethernet address: 1183 c609719bSwdenk CONFIG_ETHADDR 1184 c68a05feSrichardretanubun CONFIG_ETH1ADDR 1185 c609719bSwdenk CONFIG_ETH2ADDR 1186 c609719bSwdenk CONFIG_ETH3ADDR 1187 c68a05feSrichardretanubun CONFIG_ETH4ADDR 1188 c68a05feSrichardretanubun CONFIG_ETH5ADDR 1189 c609719bSwdenk 1190 11ccc33fSMarcel Ziswiler Define a default value for Ethernet address to use 1191 11ccc33fSMarcel Ziswiler for the respective Ethernet interface, in case this 1192 c609719bSwdenk is not determined automatically. 1193 c609719bSwdenk 1194 c609719bSwdenk- IP address: 1195 c609719bSwdenk CONFIG_IPADDR 1196 c609719bSwdenk 1197 c609719bSwdenk Define a default value for the IP address to use for 1198 11ccc33fSMarcel Ziswiler the default Ethernet interface, in case this is not 1199 c609719bSwdenk determined through e.g. bootp. 1200 c609719bSwdenk 1201 c609719bSwdenk- Server IP address: 1202 c609719bSwdenk CONFIG_SERVERIP 1203 c609719bSwdenk 1204 c609719bSwdenk Defines a default value for the IP address of a TFTP 1205 c609719bSwdenk server to contact when using the "tftboot" command. 1206 c609719bSwdenk 1207 97cfe861SRobin Getz CONFIG_KEEP_SERVERADDR 1208 97cfe861SRobin Getz 1209 97cfe861SRobin Getz Keeps the server's MAC address, in the env 'serveraddr' 1210 97cfe861SRobin Getz for passing to bootargs (like Linux's netconsole option) 1211 97cfe861SRobin Getz 1212 53a5c424SDavid Updegraff- Multicast TFTP Mode: 1213 53a5c424SDavid Updegraff CONFIG_MCAST_TFTP 1214 53a5c424SDavid Updegraff 1215 53a5c424SDavid Updegraff Defines whether you want to support multicast TFTP as per 1216 53a5c424SDavid Updegraff rfc-2090; for example to work with atftp. Lets lots of targets 1217 11ccc33fSMarcel Ziswiler tftp down the same boot image concurrently. Note: the Ethernet 1218 53a5c424SDavid Updegraff driver in use must provide a function: mcast() to join/leave a 1219 53a5c424SDavid Updegraff multicast group. 1220 53a5c424SDavid Updegraff 1221 53a5c424SDavid Updegraff CONFIG_BOOTP_RANDOM_DELAY 1222 c609719bSwdenk- BOOTP Recovery Mode: 1223 c609719bSwdenk CONFIG_BOOTP_RANDOM_DELAY 1224 c609719bSwdenk 1225 c609719bSwdenk If you have many targets in a network that try to 1226 c609719bSwdenk boot using BOOTP, you may want to avoid that all 1227 c609719bSwdenk systems send out BOOTP requests at precisely the same 1228 c609719bSwdenk moment (which would happen for instance at recovery 1229 c609719bSwdenk from a power failure, when all systems will try to 1230 c609719bSwdenk boot, thus flooding the BOOTP server. Defining 1231 c609719bSwdenk CONFIG_BOOTP_RANDOM_DELAY causes a random delay to be 1232 c609719bSwdenk inserted before sending out BOOTP requests. The 1233 6c33c785SWolfgang Denk following delays are inserted then: 1234 c609719bSwdenk 1235 c609719bSwdenk 1st BOOTP request: delay 0 ... 1 sec 1236 c609719bSwdenk 2nd BOOTP request: delay 0 ... 2 sec 1237 c609719bSwdenk 3rd BOOTP request: delay 0 ... 4 sec 1238 c609719bSwdenk 4th and following 1239 c609719bSwdenk BOOTP requests: delay 0 ... 8 sec 1240 c609719bSwdenk 1241 fe389a82Sstroese- DHCP Advanced Options: 1242 1fe80d79SJon Loeliger You can fine tune the DHCP functionality by defining 1243 1fe80d79SJon Loeliger CONFIG_BOOTP_* symbols: 1244 fe389a82Sstroese 1245 1fe80d79SJon Loeliger CONFIG_BOOTP_SUBNETMASK 1246 1fe80d79SJon Loeliger CONFIG_BOOTP_GATEWAY 1247 1fe80d79SJon Loeliger CONFIG_BOOTP_HOSTNAME 1248 1fe80d79SJon Loeliger CONFIG_BOOTP_NISDOMAIN 1249 1fe80d79SJon Loeliger CONFIG_BOOTP_BOOTPATH 1250 1fe80d79SJon Loeliger CONFIG_BOOTP_BOOTFILESIZE 1251 1fe80d79SJon Loeliger CONFIG_BOOTP_DNS 1252 1fe80d79SJon Loeliger CONFIG_BOOTP_DNS2 1253 1fe80d79SJon Loeliger CONFIG_BOOTP_SEND_HOSTNAME 1254 1fe80d79SJon Loeliger CONFIG_BOOTP_NTPSERVER 1255 1fe80d79SJon Loeliger CONFIG_BOOTP_TIMEOFFSET 1256 1fe80d79SJon Loeliger CONFIG_BOOTP_VENDOREX 1257 fe389a82Sstroese 1258 5d110f0aSWilson Callan CONFIG_BOOTP_SERVERIP - TFTP server will be the serverip 1259 5d110f0aSWilson Callan environment variable, not the BOOTP server. 1260 fe389a82Sstroese 1261 fe389a82Sstroese CONFIG_BOOTP_DNS2 - If a DHCP client requests the DNS 1262 fe389a82Sstroese serverip from a DHCP server, it is possible that more 1263 fe389a82Sstroese than one DNS serverip is offered to the client. 1264 fe389a82Sstroese If CONFIG_BOOTP_DNS2 is enabled, the secondary DNS 1265 fe389a82Sstroese serverip will be stored in the additional environment 1266 fe389a82Sstroese variable "dnsip2". The first DNS serverip is always 1267 fe389a82Sstroese stored in the variable "dnsip", when CONFIG_BOOTP_DNS 1268 1fe80d79SJon Loeliger is defined. 1269 fe389a82Sstroese 1270 fe389a82Sstroese CONFIG_BOOTP_SEND_HOSTNAME - Some DHCP servers are capable 1271 fe389a82Sstroese to do a dynamic update of a DNS server. To do this, they 1272 fe389a82Sstroese need the hostname of the DHCP requester. 1273 5d110f0aSWilson Callan If CONFIG_BOOTP_SEND_HOSTNAME is defined, the content 1274 1fe80d79SJon Loeliger of the "hostname" environment variable is passed as 1275 1fe80d79SJon Loeliger option 12 to the DHCP server. 1276 fe389a82Sstroese 1277 d9a2f416SAras Vaichas CONFIG_BOOTP_DHCP_REQUEST_DELAY 1278 d9a2f416SAras Vaichas 1279 d9a2f416SAras Vaichas A 32bit value in microseconds for a delay between 1280 d9a2f416SAras Vaichas receiving a "DHCP Offer" and sending the "DHCP Request". 1281 d9a2f416SAras Vaichas This fixes a problem with certain DHCP servers that don't 1282 d9a2f416SAras Vaichas respond 100% of the time to a "DHCP request". E.g. On an 1283 d9a2f416SAras Vaichas AT91RM9200 processor running at 180MHz, this delay needed 1284 d9a2f416SAras Vaichas to be *at least* 15,000 usec before a Windows Server 2003 1285 d9a2f416SAras Vaichas DHCP server would reply 100% of the time. I recommend at 1286 d9a2f416SAras Vaichas least 50,000 usec to be safe. The alternative is to hope 1287 d9a2f416SAras Vaichas that one of the retries will be successful but note that 1288 d9a2f416SAras Vaichas the DHCP timeout and retry process takes a longer than 1289 d9a2f416SAras Vaichas this delay. 1290 d9a2f416SAras Vaichas 1291 a3d991bdSwdenk - CDP Options: 1292 a3d991bdSwdenk CONFIG_CDP_DEVICE_ID 1293 a3d991bdSwdenk 1294 a3d991bdSwdenk The device id used in CDP trigger frames. 1295 a3d991bdSwdenk 1296 a3d991bdSwdenk CONFIG_CDP_DEVICE_ID_PREFIX 1297 a3d991bdSwdenk 1298 a3d991bdSwdenk A two character string which is prefixed to the MAC address 1299 a3d991bdSwdenk of the device. 1300 a3d991bdSwdenk 1301 a3d991bdSwdenk CONFIG_CDP_PORT_ID 1302 a3d991bdSwdenk 1303 a3d991bdSwdenk A printf format string which contains the ascii name of 1304 a3d991bdSwdenk the port. Normally is set to "eth%d" which sets 1305 11ccc33fSMarcel Ziswiler eth0 for the first Ethernet, eth1 for the second etc. 1306 a3d991bdSwdenk 1307 a3d991bdSwdenk CONFIG_CDP_CAPABILITIES 1308 a3d991bdSwdenk 1309 a3d991bdSwdenk A 32bit integer which indicates the device capabilities; 1310 a3d991bdSwdenk 0x00000010 for a normal host which does not forwards. 1311 a3d991bdSwdenk 1312 a3d991bdSwdenk CONFIG_CDP_VERSION 1313 a3d991bdSwdenk 1314 a3d991bdSwdenk An ascii string containing the version of the software. 1315 a3d991bdSwdenk 1316 a3d991bdSwdenk CONFIG_CDP_PLATFORM 1317 a3d991bdSwdenk 1318 a3d991bdSwdenk An ascii string containing the name of the platform. 1319 a3d991bdSwdenk 1320 a3d991bdSwdenk CONFIG_CDP_TRIGGER 1321 a3d991bdSwdenk 1322 a3d991bdSwdenk A 32bit integer sent on the trigger. 1323 a3d991bdSwdenk 1324 a3d991bdSwdenk CONFIG_CDP_POWER_CONSUMPTION 1325 a3d991bdSwdenk 1326 a3d991bdSwdenk A 16bit integer containing the power consumption of the 1327 a3d991bdSwdenk device in .1 of milliwatts. 1328 a3d991bdSwdenk 1329 a3d991bdSwdenk CONFIG_CDP_APPLIANCE_VLAN_TYPE 1330 a3d991bdSwdenk 1331 a3d991bdSwdenk A byte containing the id of the VLAN. 1332 a3d991bdSwdenk 1333 c609719bSwdenk- Status LED: CONFIG_STATUS_LED 1334 c609719bSwdenk 1335 c609719bSwdenk Several configurations allow to display the current 1336 c609719bSwdenk status using a LED. For instance, the LED will blink 1337 c609719bSwdenk fast while running U-Boot code, stop blinking as 1338 c609719bSwdenk soon as a reply to a BOOTP request was received, and 1339 c609719bSwdenk start blinking slow once the Linux kernel is running 1340 c609719bSwdenk (supported by a status LED driver in the Linux 1341 c609719bSwdenk kernel). Defining CONFIG_STATUS_LED enables this 1342 c609719bSwdenk feature in U-Boot. 1343 c609719bSwdenk 1344 c609719bSwdenk- CAN Support: CONFIG_CAN_DRIVER 1345 c609719bSwdenk 1346 c609719bSwdenk Defining CONFIG_CAN_DRIVER enables CAN driver support 1347 c609719bSwdenk on those systems that support this (optional) 1348 c609719bSwdenk feature, like the TQM8xxL modules. 1349 c609719bSwdenk 1350 c609719bSwdenk- I2C Support: CONFIG_HARD_I2C | CONFIG_SOFT_I2C 1351 c609719bSwdenk 1352 b37c7e5eSwdenk These enable I2C serial bus commands. Defining either of 1353 b37c7e5eSwdenk (but not both of) CONFIG_HARD_I2C or CONFIG_SOFT_I2C will 1354 11ccc33fSMarcel Ziswiler include the appropriate I2C driver for the selected CPU. 1355 c609719bSwdenk 1356 b37c7e5eSwdenk This will allow you to use i2c commands at the u-boot 1357 602ad3b3SJon Loeliger command line (as long as you set CONFIG_CMD_I2C in 1358 b37c7e5eSwdenk CONFIG_COMMANDS) and communicate with i2c based realtime 1359 b37c7e5eSwdenk clock chips. See common/cmd_i2c.c for a description of the 1360 c609719bSwdenk command line interface. 1361 c609719bSwdenk 1362 bb99ad6dSBen Warren CONFIG_HARD_I2C selects a hardware I2C controller. 1363 c609719bSwdenk 1364 b37c7e5eSwdenk CONFIG_SOFT_I2C configures u-boot to use a software (aka 1365 b37c7e5eSwdenk bit-banging) driver instead of CPM or similar hardware 1366 b37c7e5eSwdenk support for I2C. 1367 c609719bSwdenk 1368 b37c7e5eSwdenk There are several other quantities that must also be 1369 b37c7e5eSwdenk defined when you define CONFIG_HARD_I2C or CONFIG_SOFT_I2C. 1370 c609719bSwdenk 1371 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD In both cases you will need to define CONFIG_SYS_I2C_SPEED 1372 b37c7e5eSwdenk to be the frequency (in Hz) at which you wish your i2c bus 1373 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD to run and CONFIG_SYS_I2C_SLAVE to be the address of this node (ie 1374 11ccc33fSMarcel Ziswiler the CPU's i2c node address). 1375 c609719bSwdenk 1376 b37c7e5eSwdenk Now, the u-boot i2c code for the mpc8xx (cpu/mpc8xx/i2c.c) 1377 11ccc33fSMarcel Ziswiler sets the CPU up as a master node and so its address should 1378 b37c7e5eSwdenk therefore be cleared to 0 (See, eg, MPC823e User's Manual 1379 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD p.16-473). So, set CONFIG_SYS_I2C_SLAVE to 0. 1380 b37c7e5eSwdenk 1381 5da71efaSEric Millbrandt CONFIG_SYS_I2C_INIT_MPC5XXX 1382 5da71efaSEric Millbrandt 1383 5da71efaSEric Millbrandt When a board is reset during an i2c bus transfer 1384 5da71efaSEric Millbrandt chips might think that the current transfer is still 1385 5da71efaSEric Millbrandt in progress. Reset the slave devices by sending start 1386 5da71efaSEric Millbrandt commands until the slave device responds. 1387 5da71efaSEric Millbrandt 1388 b37c7e5eSwdenk That's all that's required for CONFIG_HARD_I2C. 1389 b37c7e5eSwdenk 1390 b37c7e5eSwdenk If you use the software i2c interface (CONFIG_SOFT_I2C) 1391 b37c7e5eSwdenk then the following macros need to be defined (examples are 1392 b37c7e5eSwdenk from include/configs/lwmon.h): 1393 c609719bSwdenk 1394 c609719bSwdenk I2C_INIT 1395 c609719bSwdenk 1396 b37c7e5eSwdenk (Optional). Any commands necessary to enable the I2C 1397 c609719bSwdenk controller or configure ports. 1398 c609719bSwdenk 1399 b37c7e5eSwdenk eg: #define I2C_INIT (immr->im_cpm.cp_pbdir |= PB_SCL) 1400 b37c7e5eSwdenk 1401 c609719bSwdenk I2C_PORT 1402 c609719bSwdenk 1403 c609719bSwdenk (Only for MPC8260 CPU). The I/O port to use (the code 1404 c609719bSwdenk assumes both bits are on the same port). Valid values 1405 c609719bSwdenk are 0..3 for ports A..D. 1406 c609719bSwdenk 1407 c609719bSwdenk I2C_ACTIVE 1408 c609719bSwdenk 1409 c609719bSwdenk The code necessary to make the I2C data line active 1410 c609719bSwdenk (driven). If the data line is open collector, this 1411 c609719bSwdenk define can be null. 1412 c609719bSwdenk 1413 b37c7e5eSwdenk eg: #define I2C_ACTIVE (immr->im_cpm.cp_pbdir |= PB_SDA) 1414 b37c7e5eSwdenk 1415 c609719bSwdenk I2C_TRISTATE 1416 c609719bSwdenk 1417 c609719bSwdenk The code necessary to make the I2C data line tri-stated 1418 c609719bSwdenk (inactive). If the data line is open collector, this 1419 c609719bSwdenk define can be null. 1420 c609719bSwdenk 1421 b37c7e5eSwdenk eg: #define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA) 1422 b37c7e5eSwdenk 1423 c609719bSwdenk I2C_READ 1424 c609719bSwdenk 1425 c609719bSwdenk Code that returns TRUE if the I2C data line is high, 1426 c609719bSwdenk FALSE if it is low. 1427 c609719bSwdenk 1428 b37c7e5eSwdenk eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0) 1429 b37c7e5eSwdenk 1430 c609719bSwdenk I2C_SDA(bit) 1431 c609719bSwdenk 1432 c609719bSwdenk If <bit> is TRUE, sets the I2C data line high. If it 1433 c609719bSwdenk is FALSE, it clears it (low). 1434 c609719bSwdenk 1435 b37c7e5eSwdenk eg: #define I2C_SDA(bit) \ 1436 b37c7e5eSwdenk if(bit) immr->im_cpm.cp_pbdat |= PB_SDA; \ 1437 b37c7e5eSwdenk else immr->im_cpm.cp_pbdat &= ~PB_SDA 1438 b37c7e5eSwdenk 1439 c609719bSwdenk I2C_SCL(bit) 1440 c609719bSwdenk 1441 c609719bSwdenk If <bit> is TRUE, sets the I2C clock line high. If it 1442 c609719bSwdenk is FALSE, it clears it (low). 1443 c609719bSwdenk 1444 b37c7e5eSwdenk eg: #define I2C_SCL(bit) \ 1445 b37c7e5eSwdenk if(bit) immr->im_cpm.cp_pbdat |= PB_SCL; \ 1446 b37c7e5eSwdenk else immr->im_cpm.cp_pbdat &= ~PB_SCL 1447 b37c7e5eSwdenk 1448 c609719bSwdenk I2C_DELAY 1449 c609719bSwdenk 1450 c609719bSwdenk This delay is invoked four times per clock cycle so this 1451 c609719bSwdenk controls the rate of data transfer. The data rate thus 1452 b37c7e5eSwdenk is 1 / (I2C_DELAY * 4). Often defined to be something 1453 b37c7e5eSwdenk like: 1454 b37c7e5eSwdenk 1455 b37c7e5eSwdenk #define I2C_DELAY udelay(2) 1456 c609719bSwdenk 1457 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_I2C_INIT_BOARD 1458 47cd00faSwdenk 1459 47cd00faSwdenk When a board is reset during an i2c bus transfer 1460 47cd00faSwdenk chips might think that the current transfer is still 1461 47cd00faSwdenk in progress. On some boards it is possible to access 1462 47cd00faSwdenk the i2c SCLK line directly, either by using the 1463 47cd00faSwdenk processor pin as a GPIO or by having a second pin 1464 47cd00faSwdenk connected to the bus. If this option is defined a 1465 47cd00faSwdenk custom i2c_init_board() routine in boards/xxx/board.c 1466 47cd00faSwdenk is run early in the boot sequence. 1467 47cd00faSwdenk 1468 17ea1177Swdenk CONFIG_I2CFAST (PPC405GP|PPC405EP only) 1469 17ea1177Swdenk 1470 17ea1177Swdenk This option enables configuration of bi_iic_fast[] flags 1471 17ea1177Swdenk in u-boot bd_info structure based on u-boot environment 1472 17ea1177Swdenk variable "i2cfast". (see also i2cfast) 1473 17ea1177Swdenk 1474 bb99ad6dSBen Warren CONFIG_I2C_MULTI_BUS 1475 bb99ad6dSBen Warren 1476 bb99ad6dSBen Warren This option allows the use of multiple I2C buses, each of which 1477 bb99ad6dSBen Warren must have a controller. At any point in time, only one bus is 1478 bb99ad6dSBen Warren active. To switch to a different bus, use the 'i2c dev' command. 1479 bb99ad6dSBen Warren Note that bus numbering is zero-based. 1480 bb99ad6dSBen Warren 1481 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_I2C_NOPROBES 1482 bb99ad6dSBen Warren 1483 bb99ad6dSBen Warren This option specifies a list of I2C devices that will be skipped 1484 0f89c54bSPeter Tyser when the 'i2c probe' command is issued. If CONFIG_I2C_MULTI_BUS 1485 0f89c54bSPeter Tyser is set, specify a list of bus-device pairs. Otherwise, specify 1486 0f89c54bSPeter Tyser a 1D array of device addresses 1487 bb99ad6dSBen Warren 1488 bb99ad6dSBen Warren e.g. 1489 bb99ad6dSBen Warren #undef CONFIG_I2C_MULTI_BUS 1490 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD #define CONFIG_SYS_I2C_NOPROBES {0x50,0x68} 1491 bb99ad6dSBen Warren 1492 bb99ad6dSBen Warren will skip addresses 0x50 and 0x68 on a board with one I2C bus 1493 bb99ad6dSBen Warren 1494 bb99ad6dSBen Warren #define CONFIG_I2C_MULTI_BUS 1495 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD #define CONFIG_SYS_I2C_MULTI_NOPROBES {{0,0x50},{0,0x68},{1,0x54}} 1496 bb99ad6dSBen Warren 1497 bb99ad6dSBen Warren will skip addresses 0x50 and 0x68 on bus 0 and address 0x54 on bus 1 1498 bb99ad6dSBen Warren 1499 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_SPD_BUS_NUM 1500 be5e6181STimur Tabi 1501 be5e6181STimur Tabi If defined, then this indicates the I2C bus number for DDR SPD. 1502 be5e6181STimur Tabi If not defined, then U-Boot assumes that SPD is on I2C bus 0. 1503 be5e6181STimur Tabi 1504 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_RTC_BUS_NUM 1505 0dc018ecSStefan Roese 1506 0dc018ecSStefan Roese If defined, then this indicates the I2C bus number for the RTC. 1507 0dc018ecSStefan Roese If not defined, then U-Boot assumes that RTC is on I2C bus 0. 1508 0dc018ecSStefan Roese 1509 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_DTT_BUS_NUM 1510 0dc018ecSStefan Roese 1511 0dc018ecSStefan Roese If defined, then this indicates the I2C bus number for the DTT. 1512 0dc018ecSStefan Roese If not defined, then U-Boot assumes that DTT is on I2C bus 0. 1513 0dc018ecSStefan Roese 1514 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_I2C_DTT_ADDR: 1515 9ebbb54fSVictor Gallardo 1516 9ebbb54fSVictor Gallardo If defined, specifies the I2C address of the DTT device. 1517 9ebbb54fSVictor Gallardo If not defined, then U-Boot uses predefined value for 1518 9ebbb54fSVictor Gallardo specified DTT device. 1519 9ebbb54fSVictor Gallardo 1520 be5e6181STimur Tabi CONFIG_FSL_I2C 1521 be5e6181STimur Tabi 1522 be5e6181STimur Tabi Define this option if you want to use Freescale's I2C driver in 1523 7817cb20SMarcel Ziswiler drivers/i2c/fsl_i2c.c. 1524 be5e6181STimur Tabi 1525 67b23a32SHeiko Schocher CONFIG_I2C_MUX 1526 67b23a32SHeiko Schocher 1527 67b23a32SHeiko Schocher Define this option if you have I2C devices reached over 1 .. n 1528 67b23a32SHeiko Schocher I2C Muxes like the pca9544a. This option addes a new I2C 1529 67b23a32SHeiko Schocher Command "i2c bus [muxtype:muxaddr:muxchannel]" which adds a 1530 67b23a32SHeiko Schocher new I2C Bus to the existing I2C Busses. If you select the 1531 67b23a32SHeiko Schocher new Bus with "i2c dev", u-bbot sends first the commandos for 1532 67b23a32SHeiko Schocher the muxes to activate this new "bus". 1533 67b23a32SHeiko Schocher 1534 67b23a32SHeiko Schocher CONFIG_I2C_MULTI_BUS must be also defined, to use this 1535 67b23a32SHeiko Schocher feature! 1536 67b23a32SHeiko Schocher 1537 67b23a32SHeiko Schocher Example: 1538 67b23a32SHeiko Schocher Adding a new I2C Bus reached over 2 pca9544a muxes 1539 67b23a32SHeiko Schocher The First mux with address 70 and channel 6 1540 67b23a32SHeiko Schocher The Second mux with address 71 and channel 4 1541 67b23a32SHeiko Schocher 1542 67b23a32SHeiko Schocher => i2c bus pca9544a:70:6:pca9544a:71:4 1543 67b23a32SHeiko Schocher 1544 67b23a32SHeiko Schocher Use the "i2c bus" command without parameter, to get a list 1545 67b23a32SHeiko Schocher of I2C Busses with muxes: 1546 67b23a32SHeiko Schocher 1547 67b23a32SHeiko Schocher => i2c bus 1548 67b23a32SHeiko Schocher Busses reached over muxes: 1549 67b23a32SHeiko Schocher Bus ID: 2 1550 67b23a32SHeiko Schocher reached over Mux(es): 1551 67b23a32SHeiko Schocher pca9544a@70 ch: 4 1552 67b23a32SHeiko Schocher Bus ID: 3 1553 67b23a32SHeiko Schocher reached over Mux(es): 1554 67b23a32SHeiko Schocher pca9544a@70 ch: 6 1555 67b23a32SHeiko Schocher pca9544a@71 ch: 4 1556 67b23a32SHeiko Schocher => 1557 67b23a32SHeiko Schocher 1558 67b23a32SHeiko Schocher If you now switch to the new I2C Bus 3 with "i2c dev 3" 1559 67b23a32SHeiko Schocher u-boot sends First the Commando to the mux@70 to enable 1560 67b23a32SHeiko Schocher channel 6, and then the Commando to the mux@71 to enable 1561 67b23a32SHeiko Schocher the channel 4. 1562 67b23a32SHeiko Schocher 1563 67b23a32SHeiko Schocher After that, you can use the "normal" i2c commands as 1564 67b23a32SHeiko Schocher usual, to communicate with your I2C devices behind 1565 67b23a32SHeiko Schocher the 2 muxes. 1566 67b23a32SHeiko Schocher 1567 67b23a32SHeiko Schocher This option is actually implemented for the bitbanging 1568 67b23a32SHeiko Schocher algorithm in common/soft_i2c.c and for the Hardware I2C 1569 67b23a32SHeiko Schocher Bus on the MPC8260. But it should be not so difficult 1570 67b23a32SHeiko Schocher to add this option to other architectures. 1571 67b23a32SHeiko Schocher 1572 2ac6985aSAndrew Dyer CONFIG_SOFT_I2C_READ_REPEATED_START 1573 2ac6985aSAndrew Dyer 1574 2ac6985aSAndrew Dyer defining this will force the i2c_read() function in 1575 2ac6985aSAndrew Dyer the soft_i2c driver to perform an I2C repeated start 1576 2ac6985aSAndrew Dyer between writing the address pointer and reading the 1577 2ac6985aSAndrew Dyer data. If this define is omitted the default behaviour 1578 2ac6985aSAndrew Dyer of doing a stop-start sequence will be used. Most I2C 1579 2ac6985aSAndrew Dyer devices can use either method, but some require one or 1580 2ac6985aSAndrew Dyer the other. 1581 be5e6181STimur Tabi 1582 c609719bSwdenk- SPI Support: CONFIG_SPI 1583 c609719bSwdenk 1584 c609719bSwdenk Enables SPI driver (so far only tested with 1585 c609719bSwdenk SPI EEPROM, also an instance works with Crystal A/D and 1586 c609719bSwdenk D/As on the SACSng board) 1587 c609719bSwdenk 1588 c609719bSwdenk CONFIG_SPI_X 1589 c609719bSwdenk 1590 c609719bSwdenk Enables extended (16-bit) SPI EEPROM addressing. 1591 c609719bSwdenk (symmetrical to CONFIG_I2C_X) 1592 c609719bSwdenk 1593 c609719bSwdenk CONFIG_SOFT_SPI 1594 c609719bSwdenk 1595 c609719bSwdenk Enables a software (bit-bang) SPI driver rather than 1596 c609719bSwdenk using hardware support. This is a general purpose 1597 c609719bSwdenk driver that only requires three general I/O port pins 1598 c609719bSwdenk (two outputs, one input) to function. If this is 1599 c609719bSwdenk defined, the board configuration must define several 1600 c609719bSwdenk SPI configuration items (port pins to use, etc). For 1601 c609719bSwdenk an example, see include/configs/sacsng.h. 1602 c609719bSwdenk 1603 04a9e118SBen Warren CONFIG_HARD_SPI 1604 04a9e118SBen Warren 1605 04a9e118SBen Warren Enables a hardware SPI driver for general-purpose reads 1606 04a9e118SBen Warren and writes. As with CONFIG_SOFT_SPI, the board configuration 1607 04a9e118SBen Warren must define a list of chip-select function pointers. 1608 04a9e118SBen Warren Currently supported on some MPC8xxx processors. For an 1609 04a9e118SBen Warren example, see include/configs/mpc8349emds.h. 1610 04a9e118SBen Warren 1611 38254f45SGuennadi Liakhovetski CONFIG_MXC_SPI 1612 38254f45SGuennadi Liakhovetski 1613 38254f45SGuennadi Liakhovetski Enables the driver for the SPI controllers on i.MX and MXC 1614 38254f45SGuennadi Liakhovetski SoCs. Currently only i.MX31 is supported. 1615 38254f45SGuennadi Liakhovetski 1616 0133502eSMatthias Fuchs- FPGA Support: CONFIG_FPGA 1617 0133502eSMatthias Fuchs 1618 0133502eSMatthias Fuchs Enables FPGA subsystem. 1619 0133502eSMatthias Fuchs 1620 0133502eSMatthias Fuchs CONFIG_FPGA_<vendor> 1621 0133502eSMatthias Fuchs 1622 0133502eSMatthias Fuchs Enables support for specific chip vendors. 1623 0133502eSMatthias Fuchs (ALTERA, XILINX) 1624 0133502eSMatthias Fuchs 1625 0133502eSMatthias Fuchs CONFIG_FPGA_<family> 1626 0133502eSMatthias Fuchs 1627 0133502eSMatthias Fuchs Enables support for FPGA family. 1628 0133502eSMatthias Fuchs (SPARTAN2, SPARTAN3, VIRTEX2, CYCLONE2, ACEX1K, ACEX) 1629 0133502eSMatthias Fuchs 1630 0133502eSMatthias Fuchs CONFIG_FPGA_COUNT 1631 c609719bSwdenk 1632 c609719bSwdenk Specify the number of FPGA devices to support. 1633 c609719bSwdenk 1634 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_FPGA_PROG_FEEDBACK 1635 c609719bSwdenk 1636 c609719bSwdenk Enable printing of hash marks during FPGA configuration. 1637 c609719bSwdenk 1638 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_FPGA_CHECK_BUSY 1639 c609719bSwdenk 1640 c609719bSwdenk Enable checks on FPGA configuration interface busy 1641 c609719bSwdenk status by the configuration function. This option 1642 c609719bSwdenk will require a board or device specific function to 1643 c609719bSwdenk be written. 1644 c609719bSwdenk 1645 c609719bSwdenk CONFIG_FPGA_DELAY 1646 c609719bSwdenk 1647 c609719bSwdenk If defined, a function that provides delays in the FPGA 1648 c609719bSwdenk configuration driver. 1649 c609719bSwdenk 1650 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_FPGA_CHECK_CTRLC 1651 c609719bSwdenk Allow Control-C to interrupt FPGA configuration 1652 c609719bSwdenk 1653 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_FPGA_CHECK_ERROR 1654 c609719bSwdenk 1655 c609719bSwdenk Check for configuration errors during FPGA bitfile 1656 c609719bSwdenk loading. For example, abort during Virtex II 1657 c609719bSwdenk configuration if the INIT_B line goes low (which 1658 c609719bSwdenk indicated a CRC error). 1659 c609719bSwdenk 1660 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_FPGA_WAIT_INIT 1661 c609719bSwdenk 1662 c609719bSwdenk Maximum time to wait for the INIT_B line to deassert 1663 c609719bSwdenk after PROB_B has been deasserted during a Virtex II 1664 c609719bSwdenk FPGA configuration sequence. The default time is 500 1665 11ccc33fSMarcel Ziswiler ms. 1666 c609719bSwdenk 1667 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_FPGA_WAIT_BUSY 1668 c609719bSwdenk 1669 c609719bSwdenk Maximum time to wait for BUSY to deassert during 1670 11ccc33fSMarcel Ziswiler Virtex II FPGA configuration. The default is 5 ms. 1671 c609719bSwdenk 1672 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_FPGA_WAIT_CONFIG 1673 c609719bSwdenk 1674 c609719bSwdenk Time to wait after FPGA configuration. The default is 1675 11ccc33fSMarcel Ziswiler 200 ms. 1676 c609719bSwdenk 1677 c609719bSwdenk- Configuration Management: 1678 c609719bSwdenk CONFIG_IDENT_STRING 1679 c609719bSwdenk 1680 c609719bSwdenk If defined, this string will be added to the U-Boot 1681 c609719bSwdenk version information (U_BOOT_VERSION) 1682 c609719bSwdenk 1683 c609719bSwdenk- Vendor Parameter Protection: 1684 c609719bSwdenk 1685 c609719bSwdenk U-Boot considers the values of the environment 1686 c609719bSwdenk variables "serial#" (Board Serial Number) and 1687 7152b1d0Swdenk "ethaddr" (Ethernet Address) to be parameters that 1688 c609719bSwdenk are set once by the board vendor / manufacturer, and 1689 c609719bSwdenk protects these variables from casual modification by 1690 c609719bSwdenk the user. Once set, these variables are read-only, 1691 c609719bSwdenk and write or delete attempts are rejected. You can 1692 11ccc33fSMarcel Ziswiler change this behaviour: 1693 c609719bSwdenk 1694 c609719bSwdenk If CONFIG_ENV_OVERWRITE is #defined in your config 1695 c609719bSwdenk file, the write protection for vendor parameters is 1696 47cd00faSwdenk completely disabled. Anybody can change or delete 1697 c609719bSwdenk these parameters. 1698 c609719bSwdenk 1699 c609719bSwdenk Alternatively, if you #define _both_ CONFIG_ETHADDR 1700 c609719bSwdenk _and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default 1701 11ccc33fSMarcel Ziswiler Ethernet address is installed in the environment, 1702 c609719bSwdenk which can be changed exactly ONCE by the user. [The 1703 c609719bSwdenk serial# is unaffected by this, i. e. it remains 1704 c609719bSwdenk read-only.] 1705 c609719bSwdenk 1706 c609719bSwdenk- Protected RAM: 1707 c609719bSwdenk CONFIG_PRAM 1708 c609719bSwdenk 1709 c609719bSwdenk Define this variable to enable the reservation of 1710 c609719bSwdenk "protected RAM", i. e. RAM which is not overwritten 1711 c609719bSwdenk by U-Boot. Define CONFIG_PRAM to hold the number of 1712 c609719bSwdenk kB you want to reserve for pRAM. You can overwrite 1713 c609719bSwdenk this default value by defining an environment 1714 c609719bSwdenk variable "pram" to the number of kB you want to 1715 c609719bSwdenk reserve. Note that the board info structure will 1716 c609719bSwdenk still show the full amount of RAM. If pRAM is 1717 c609719bSwdenk reserved, a new environment variable "mem" will 1718 c609719bSwdenk automatically be defined to hold the amount of 1719 c609719bSwdenk remaining RAM in a form that can be passed as boot 1720 c609719bSwdenk argument to Linux, for instance like that: 1721 c609719bSwdenk 1722 fe126d8bSWolfgang Denk setenv bootargs ... mem=\${mem} 1723 c609719bSwdenk saveenv 1724 c609719bSwdenk 1725 c609719bSwdenk This way you can tell Linux not to use this memory, 1726 c609719bSwdenk either, which results in a memory region that will 1727 c609719bSwdenk not be affected by reboots. 1728 c609719bSwdenk 1729 c609719bSwdenk *WARNING* If your board configuration uses automatic 1730 c609719bSwdenk detection of the RAM size, you must make sure that 1731 c609719bSwdenk this memory test is non-destructive. So far, the 1732 c609719bSwdenk following board configurations are known to be 1733 c609719bSwdenk "pRAM-clean": 1734 c609719bSwdenk 1735 c609719bSwdenk ETX094, IVMS8, IVML24, SPD8xx, TQM8xxL, 1736 c609719bSwdenk HERMES, IP860, RPXlite, LWMON, LANTEC, 1737 c609719bSwdenk PCU_E, FLAGADM, TQM8260 1738 c609719bSwdenk 1739 c609719bSwdenk- Error Recovery: 1740 c609719bSwdenk CONFIG_PANIC_HANG 1741 c609719bSwdenk 1742 c609719bSwdenk Define this variable to stop the system in case of a 1743 c609719bSwdenk fatal error, so that you have to reset it manually. 1744 c609719bSwdenk This is probably NOT a good idea for an embedded 1745 11ccc33fSMarcel Ziswiler system where you want the system to reboot 1746 c609719bSwdenk automatically as fast as possible, but it may be 1747 c609719bSwdenk useful during development since you can try to debug 1748 c609719bSwdenk the conditions that lead to the situation. 1749 c609719bSwdenk 1750 c609719bSwdenk CONFIG_NET_RETRY_COUNT 1751 c609719bSwdenk 1752 c609719bSwdenk This variable defines the number of retries for 1753 c609719bSwdenk network operations like ARP, RARP, TFTP, or BOOTP 1754 c609719bSwdenk before giving up the operation. If not defined, a 1755 c609719bSwdenk default value of 5 is used. 1756 c609719bSwdenk 1757 40cb90eeSGuennadi Liakhovetski CONFIG_ARP_TIMEOUT 1758 40cb90eeSGuennadi Liakhovetski 1759 40cb90eeSGuennadi Liakhovetski Timeout waiting for an ARP reply in milliseconds. 1760 40cb90eeSGuennadi Liakhovetski 1761 c609719bSwdenk- Command Interpreter: 1762 8078f1a5SWolfgang Denk CONFIG_AUTO_COMPLETE 1763 04a85b3bSwdenk 1764 04a85b3bSwdenk Enable auto completion of commands using TAB. 1765 04a85b3bSwdenk 1766 8078f1a5SWolfgang Denk Note that this feature has NOT been implemented yet 1767 8078f1a5SWolfgang Denk for the "hush" shell. 1768 8078f1a5SWolfgang Denk 1769 8078f1a5SWolfgang Denk 1770 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_HUSH_PARSER 1771 c609719bSwdenk 1772 c609719bSwdenk Define this variable to enable the "hush" shell (from 1773 c609719bSwdenk Busybox) as command line interpreter, thus enabling 1774 c609719bSwdenk powerful command line syntax like 1775 c609719bSwdenk if...then...else...fi conditionals or `&&' and '||' 1776 c609719bSwdenk constructs ("shell scripts"). 1777 c609719bSwdenk 1778 c609719bSwdenk If undefined, you get the old, much simpler behaviour 1779 c609719bSwdenk with a somewhat smaller memory footprint. 1780 c609719bSwdenk 1781 c609719bSwdenk 1782 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_PROMPT_HUSH_PS2 1783 c609719bSwdenk 1784 c609719bSwdenk This defines the secondary prompt string, which is 1785 c609719bSwdenk printed when the command interpreter needs more input 1786 c609719bSwdenk to complete a command. Usually "> ". 1787 c609719bSwdenk 1788 c609719bSwdenk Note: 1789 c609719bSwdenk 1790 c609719bSwdenk In the current implementation, the local variables 1791 c609719bSwdenk space and global environment variables space are 1792 c609719bSwdenk separated. Local variables are those you define by 1793 3b57fe0aSwdenk simply typing `name=value'. To access a local 1794 c609719bSwdenk variable later on, you have write `$name' or 1795 3b57fe0aSwdenk `${name}'; to execute the contents of a variable 1796 3b57fe0aSwdenk directly type `$name' at the command prompt. 1797 c609719bSwdenk 1798 c609719bSwdenk Global environment variables are those you use 1799 c609719bSwdenk setenv/printenv to work with. To run a command stored 1800 c609719bSwdenk in such a variable, you need to use the run command, 1801 c609719bSwdenk and you must not use the '$' sign to access them. 1802 c609719bSwdenk 1803 c609719bSwdenk To store commands and special characters in a 1804 c609719bSwdenk variable, please use double quotation marks 1805 c609719bSwdenk surrounding the whole text of the variable, instead 1806 c609719bSwdenk of the backslashes before semicolons and special 1807 c609719bSwdenk symbols. 1808 c609719bSwdenk 1809 aa0c71acSWolfgang Denk- Commandline Editing and History: 1810 aa0c71acSWolfgang Denk CONFIG_CMDLINE_EDITING 1811 aa0c71acSWolfgang Denk 1812 11ccc33fSMarcel Ziswiler Enable editing and History functions for interactive 1813 aa0c71acSWolfgang Denk commandline input operations 1814 aa0c71acSWolfgang Denk 1815 a8c7c708Swdenk- Default Environment: 1816 c609719bSwdenk CONFIG_EXTRA_ENV_SETTINGS 1817 c609719bSwdenk 1818 c609719bSwdenk Define this to contain any number of null terminated 1819 c609719bSwdenk strings (variable = value pairs) that will be part of 1820 7152b1d0Swdenk the default environment compiled into the boot image. 1821 2262cfeeSwdenk 1822 c609719bSwdenk For example, place something like this in your 1823 c609719bSwdenk board's config file: 1824 c609719bSwdenk 1825 c609719bSwdenk #define CONFIG_EXTRA_ENV_SETTINGS \ 1826 c609719bSwdenk "myvar1=value1\0" \ 1827 c609719bSwdenk "myvar2=value2\0" 1828 c609719bSwdenk 1829 c609719bSwdenk Warning: This method is based on knowledge about the 1830 c609719bSwdenk internal format how the environment is stored by the 1831 2262cfeeSwdenk U-Boot code. This is NOT an official, exported 1832 c609719bSwdenk interface! Although it is unlikely that this format 1833 7152b1d0Swdenk will change soon, there is no guarantee either. 1834 c609719bSwdenk You better know what you are doing here. 1835 c609719bSwdenk 1836 c609719bSwdenk Note: overly (ab)use of the default environment is 1837 c609719bSwdenk discouraged. Make sure to check other ways to preset 1838 74de7aefSWolfgang Denk the environment like the "source" command or the 1839 c609719bSwdenk boot command first. 1840 c609719bSwdenk 1841 a8c7c708Swdenk- DataFlash Support: 1842 2abbe075Swdenk CONFIG_HAS_DATAFLASH 1843 2abbe075Swdenk 1844 2abbe075Swdenk Defining this option enables DataFlash features and 1845 2abbe075Swdenk allows to read/write in Dataflash via the standard 1846 2abbe075Swdenk commands cp, md... 1847 2abbe075Swdenk 1848 3f85ce27Swdenk- SystemACE Support: 1849 3f85ce27Swdenk CONFIG_SYSTEMACE 1850 3f85ce27Swdenk 1851 3f85ce27Swdenk Adding this option adds support for Xilinx SystemACE 1852 3f85ce27Swdenk chips attached via some sort of local bus. The address 1853 11ccc33fSMarcel Ziswiler of the chip must also be defined in the 1854 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_SYSTEMACE_BASE macro. For example: 1855 3f85ce27Swdenk 1856 3f85ce27Swdenk #define CONFIG_SYSTEMACE 1857 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD #define CONFIG_SYS_SYSTEMACE_BASE 0xf0000000 1858 3f85ce27Swdenk 1859 3f85ce27Swdenk When SystemACE support is added, the "ace" device type 1860 3f85ce27Swdenk becomes available to the fat commands, i.e. fatls. 1861 3f85ce27Swdenk 1862 ecb0ccd9SWolfgang Denk- TFTP Fixed UDP Port: 1863 ecb0ccd9SWolfgang Denk CONFIG_TFTP_PORT 1864 ecb0ccd9SWolfgang Denk 1865 28cb9375SWolfgang Denk If this is defined, the environment variable tftpsrcp 1866 ecb0ccd9SWolfgang Denk is used to supply the TFTP UDP source port value. 1867 28cb9375SWolfgang Denk If tftpsrcp isn't defined, the normal pseudo-random port 1868 ecb0ccd9SWolfgang Denk number generator is used. 1869 ecb0ccd9SWolfgang Denk 1870 28cb9375SWolfgang Denk Also, the environment variable tftpdstp is used to supply 1871 28cb9375SWolfgang Denk the TFTP UDP destination port value. If tftpdstp isn't 1872 28cb9375SWolfgang Denk defined, the normal port 69 is used. 1873 28cb9375SWolfgang Denk 1874 28cb9375SWolfgang Denk The purpose for tftpsrcp is to allow a TFTP server to 1875 ecb0ccd9SWolfgang Denk blindly start the TFTP transfer using the pre-configured 1876 ecb0ccd9SWolfgang Denk target IP address and UDP port. This has the effect of 1877 ecb0ccd9SWolfgang Denk "punching through" the (Windows XP) firewall, allowing 1878 ecb0ccd9SWolfgang Denk the remainder of the TFTP transfer to proceed normally. 1879 ecb0ccd9SWolfgang Denk A better solution is to properly configure the firewall, 1880 ecb0ccd9SWolfgang Denk but sometimes that is not allowed. 1881 ecb0ccd9SWolfgang Denk 1882 a8c7c708Swdenk- Show boot progress: 1883 c609719bSwdenk CONFIG_SHOW_BOOT_PROGRESS 1884 c609719bSwdenk 1885 c609719bSwdenk Defining this option allows to add some board- 1886 c609719bSwdenk specific code (calling a user-provided function 1887 c609719bSwdenk "show_boot_progress(int)") that enables you to show 1888 c609719bSwdenk the system's boot progress on some display (for 1889 c609719bSwdenk example, some LED's) on your board. At the moment, 1890 c609719bSwdenk the following checkpoints are implemented: 1891 c609719bSwdenk 1892 4bae9090SBartlomiej Sieka- Automatic software updates via TFTP server 1893 4bae9090SBartlomiej Sieka CONFIG_UPDATE_TFTP 1894 4bae9090SBartlomiej Sieka CONFIG_UPDATE_TFTP_CNT_MAX 1895 4bae9090SBartlomiej Sieka CONFIG_UPDATE_TFTP_MSEC_MAX 1896 4bae9090SBartlomiej Sieka 1897 4bae9090SBartlomiej Sieka These options enable and control the auto-update feature; 1898 4bae9090SBartlomiej Sieka for a more detailed description refer to doc/README.update. 1899 4bae9090SBartlomiej Sieka 1900 d558107cSStefan Roese- MTD Support (mtdparts command, UBI support) 1901 d558107cSStefan Roese CONFIG_MTD_DEVICE 1902 d558107cSStefan Roese 1903 d558107cSStefan Roese Adds the MTD device infrastructure from the Linux kernel. 1904 d558107cSStefan Roese Needed for mtdparts command support. 1905 d558107cSStefan Roese 1906 d558107cSStefan Roese CONFIG_MTD_PARTITIONS 1907 d558107cSStefan Roese 1908 d558107cSStefan Roese Adds the MTD partitioning infrastructure from the Linux 1909 d558107cSStefan Roese kernel. Needed for UBI support. 1910 d558107cSStefan Roese 1911 1372cce2SMarian BalakowiczLegacy uImage format: 1912 1372cce2SMarian Balakowicz 1913 c609719bSwdenk Arg Where When 1914 c609719bSwdenk 1 common/cmd_bootm.c before attempting to boot an image 1915 c609719bSwdenk -1 common/cmd_bootm.c Image header has bad magic number 1916 c609719bSwdenk 2 common/cmd_bootm.c Image header has correct magic number 1917 c609719bSwdenk -2 common/cmd_bootm.c Image header has bad checksum 1918 c609719bSwdenk 3 common/cmd_bootm.c Image header has correct checksum 1919 c609719bSwdenk -3 common/cmd_bootm.c Image data has bad checksum 1920 c609719bSwdenk 4 common/cmd_bootm.c Image data has correct checksum 1921 c609719bSwdenk -4 common/cmd_bootm.c Image is for unsupported architecture 1922 c609719bSwdenk 5 common/cmd_bootm.c Architecture check OK 1923 1372cce2SMarian Balakowicz -5 common/cmd_bootm.c Wrong Image Type (not kernel, multi) 1924 c609719bSwdenk 6 common/cmd_bootm.c Image Type check OK 1925 c609719bSwdenk -6 common/cmd_bootm.c gunzip uncompression error 1926 c609719bSwdenk -7 common/cmd_bootm.c Unimplemented compression type 1927 c609719bSwdenk 7 common/cmd_bootm.c Uncompression OK 1928 1372cce2SMarian Balakowicz 8 common/cmd_bootm.c No uncompress/copy overwrite error 1929 c609719bSwdenk -9 common/cmd_bootm.c Unsupported OS (not Linux, BSD, VxWorks, QNX) 1930 1372cce2SMarian Balakowicz 1931 1372cce2SMarian Balakowicz 9 common/image.c Start initial ramdisk verification 1932 1372cce2SMarian Balakowicz -10 common/image.c Ramdisk header has bad magic number 1933 1372cce2SMarian Balakowicz -11 common/image.c Ramdisk header has bad checksum 1934 1372cce2SMarian Balakowicz 10 common/image.c Ramdisk header is OK 1935 1372cce2SMarian Balakowicz -12 common/image.c Ramdisk data has bad checksum 1936 1372cce2SMarian Balakowicz 11 common/image.c Ramdisk data has correct checksum 1937 1372cce2SMarian Balakowicz 12 common/image.c Ramdisk verification complete, start loading 1938 11ccc33fSMarcel Ziswiler -13 common/image.c Wrong Image Type (not PPC Linux ramdisk) 1939 1372cce2SMarian Balakowicz 13 common/image.c Start multifile image verification 1940 1372cce2SMarian Balakowicz 14 common/image.c No initial ramdisk, no multifile, continue. 1941 1372cce2SMarian Balakowicz 1942 1372cce2SMarian Balakowicz 15 lib_<arch>/bootm.c All preparation done, transferring control to OS 1943 c609719bSwdenk 1944 63e73c9aSwdenk -30 lib_ppc/board.c Fatal error, hang the system 1945 63e73c9aSwdenk -31 post/post.c POST test failed, detected by post_output_backlog() 1946 63e73c9aSwdenk -32 post/post.c POST test failed, detected by post_run_single() 1947 63e73c9aSwdenk 1948 566a494fSHeiko Schocher 34 common/cmd_doc.c before loading a Image from a DOC device 1949 566a494fSHeiko Schocher -35 common/cmd_doc.c Bad usage of "doc" command 1950 566a494fSHeiko Schocher 35 common/cmd_doc.c correct usage of "doc" command 1951 566a494fSHeiko Schocher -36 common/cmd_doc.c No boot device 1952 566a494fSHeiko Schocher 36 common/cmd_doc.c correct boot device 1953 566a494fSHeiko Schocher -37 common/cmd_doc.c Unknown Chip ID on boot device 1954 566a494fSHeiko Schocher 37 common/cmd_doc.c correct chip ID found, device available 1955 566a494fSHeiko Schocher -38 common/cmd_doc.c Read Error on boot device 1956 566a494fSHeiko Schocher 38 common/cmd_doc.c reading Image header from DOC device OK 1957 566a494fSHeiko Schocher -39 common/cmd_doc.c Image header has bad magic number 1958 566a494fSHeiko Schocher 39 common/cmd_doc.c Image header has correct magic number 1959 566a494fSHeiko Schocher -40 common/cmd_doc.c Error reading Image from DOC device 1960 566a494fSHeiko Schocher 40 common/cmd_doc.c Image header has correct magic number 1961 566a494fSHeiko Schocher 41 common/cmd_ide.c before loading a Image from a IDE device 1962 566a494fSHeiko Schocher -42 common/cmd_ide.c Bad usage of "ide" command 1963 566a494fSHeiko Schocher 42 common/cmd_ide.c correct usage of "ide" command 1964 566a494fSHeiko Schocher -43 common/cmd_ide.c No boot device 1965 566a494fSHeiko Schocher 43 common/cmd_ide.c boot device found 1966 566a494fSHeiko Schocher -44 common/cmd_ide.c Device not available 1967 566a494fSHeiko Schocher 44 common/cmd_ide.c Device available 1968 566a494fSHeiko Schocher -45 common/cmd_ide.c wrong partition selected 1969 566a494fSHeiko Schocher 45 common/cmd_ide.c partition selected 1970 566a494fSHeiko Schocher -46 common/cmd_ide.c Unknown partition table 1971 566a494fSHeiko Schocher 46 common/cmd_ide.c valid partition table found 1972 566a494fSHeiko Schocher -47 common/cmd_ide.c Invalid partition type 1973 566a494fSHeiko Schocher 47 common/cmd_ide.c correct partition type 1974 566a494fSHeiko Schocher -48 common/cmd_ide.c Error reading Image Header on boot device 1975 566a494fSHeiko Schocher 48 common/cmd_ide.c reading Image Header from IDE device OK 1976 566a494fSHeiko Schocher -49 common/cmd_ide.c Image header has bad magic number 1977 566a494fSHeiko Schocher 49 common/cmd_ide.c Image header has correct magic number 1978 566a494fSHeiko Schocher -50 common/cmd_ide.c Image header has bad checksum 1979 566a494fSHeiko Schocher 50 common/cmd_ide.c Image header has correct checksum 1980 566a494fSHeiko Schocher -51 common/cmd_ide.c Error reading Image from IDE device 1981 566a494fSHeiko Schocher 51 common/cmd_ide.c reading Image from IDE device OK 1982 566a494fSHeiko Schocher 52 common/cmd_nand.c before loading a Image from a NAND device 1983 566a494fSHeiko Schocher -53 common/cmd_nand.c Bad usage of "nand" command 1984 566a494fSHeiko Schocher 53 common/cmd_nand.c correct usage of "nand" command 1985 566a494fSHeiko Schocher -54 common/cmd_nand.c No boot device 1986 566a494fSHeiko Schocher 54 common/cmd_nand.c boot device found 1987 566a494fSHeiko Schocher -55 common/cmd_nand.c Unknown Chip ID on boot device 1988 566a494fSHeiko Schocher 55 common/cmd_nand.c correct chip ID found, device available 1989 566a494fSHeiko Schocher -56 common/cmd_nand.c Error reading Image Header on boot device 1990 566a494fSHeiko Schocher 56 common/cmd_nand.c reading Image Header from NAND device OK 1991 566a494fSHeiko Schocher -57 common/cmd_nand.c Image header has bad magic number 1992 566a494fSHeiko Schocher 57 common/cmd_nand.c Image header has correct magic number 1993 566a494fSHeiko Schocher -58 common/cmd_nand.c Error reading Image from NAND device 1994 566a494fSHeiko Schocher 58 common/cmd_nand.c reading Image from NAND device OK 1995 c609719bSwdenk 1996 566a494fSHeiko Schocher -60 common/env_common.c Environment has a bad CRC, using default 1997 c609719bSwdenk 1998 566a494fSHeiko Schocher 64 net/eth.c starting with Ethernet configuration. 1999 566a494fSHeiko Schocher -64 net/eth.c no Ethernet found. 2000 566a494fSHeiko Schocher 65 net/eth.c Ethernet found. 2001 206c60cbSwdenk 2002 566a494fSHeiko Schocher -80 common/cmd_net.c usage wrong 2003 566a494fSHeiko Schocher 80 common/cmd_net.c before calling NetLoop() 2004 11ccc33fSMarcel Ziswiler -81 common/cmd_net.c some error in NetLoop() occurred 2005 566a494fSHeiko Schocher 81 common/cmd_net.c NetLoop() back without error 2006 566a494fSHeiko Schocher -82 common/cmd_net.c size == 0 (File with size 0 loaded) 2007 566a494fSHeiko Schocher 82 common/cmd_net.c trying automatic boot 2008 74de7aefSWolfgang Denk 83 common/cmd_net.c running "source" command 2009 74de7aefSWolfgang Denk -83 common/cmd_net.c some error in automatic boot or "source" command 2010 566a494fSHeiko Schocher 84 common/cmd_net.c end without errors 2011 c609719bSwdenk 2012 1372cce2SMarian BalakowiczFIT uImage format: 2013 1372cce2SMarian Balakowicz 2014 1372cce2SMarian Balakowicz Arg Where When 2015 1372cce2SMarian Balakowicz 100 common/cmd_bootm.c Kernel FIT Image has correct format 2016 1372cce2SMarian Balakowicz -100 common/cmd_bootm.c Kernel FIT Image has incorrect format 2017 1372cce2SMarian Balakowicz 101 common/cmd_bootm.c No Kernel subimage unit name, using configuration 2018 1372cce2SMarian Balakowicz -101 common/cmd_bootm.c Can't get configuration for kernel subimage 2019 1372cce2SMarian Balakowicz 102 common/cmd_bootm.c Kernel unit name specified 2020 1372cce2SMarian Balakowicz -103 common/cmd_bootm.c Can't get kernel subimage node offset 2021 f773bea8SMarian Balakowicz 103 common/cmd_bootm.c Found configuration node 2022 1372cce2SMarian Balakowicz 104 common/cmd_bootm.c Got kernel subimage node offset 2023 1372cce2SMarian Balakowicz -104 common/cmd_bootm.c Kernel subimage hash verification failed 2024 1372cce2SMarian Balakowicz 105 common/cmd_bootm.c Kernel subimage hash verification OK 2025 1372cce2SMarian Balakowicz -105 common/cmd_bootm.c Kernel subimage is for unsupported architecture 2026 1372cce2SMarian Balakowicz 106 common/cmd_bootm.c Architecture check OK 2027 11ccc33fSMarcel Ziswiler -106 common/cmd_bootm.c Kernel subimage has wrong type 2028 11ccc33fSMarcel Ziswiler 107 common/cmd_bootm.c Kernel subimage type OK 2029 1372cce2SMarian Balakowicz -107 common/cmd_bootm.c Can't get kernel subimage data/size 2030 1372cce2SMarian Balakowicz 108 common/cmd_bootm.c Got kernel subimage data/size 2031 1372cce2SMarian Balakowicz -108 common/cmd_bootm.c Wrong image type (not legacy, FIT) 2032 1372cce2SMarian Balakowicz -109 common/cmd_bootm.c Can't get kernel subimage type 2033 1372cce2SMarian Balakowicz -110 common/cmd_bootm.c Can't get kernel subimage comp 2034 1372cce2SMarian Balakowicz -111 common/cmd_bootm.c Can't get kernel subimage os 2035 1372cce2SMarian Balakowicz -112 common/cmd_bootm.c Can't get kernel subimage load address 2036 1372cce2SMarian Balakowicz -113 common/cmd_bootm.c Image uncompress/copy overwrite error 2037 1372cce2SMarian Balakowicz 2038 1372cce2SMarian Balakowicz 120 common/image.c Start initial ramdisk verification 2039 1372cce2SMarian Balakowicz -120 common/image.c Ramdisk FIT image has incorrect format 2040 1372cce2SMarian Balakowicz 121 common/image.c Ramdisk FIT image has correct format 2041 11ccc33fSMarcel Ziswiler 122 common/image.c No ramdisk subimage unit name, using configuration 2042 1372cce2SMarian Balakowicz -122 common/image.c Can't get configuration for ramdisk subimage 2043 1372cce2SMarian Balakowicz 123 common/image.c Ramdisk unit name specified 2044 1372cce2SMarian Balakowicz -124 common/image.c Can't get ramdisk subimage node offset 2045 1372cce2SMarian Balakowicz 125 common/image.c Got ramdisk subimage node offset 2046 1372cce2SMarian Balakowicz -125 common/image.c Ramdisk subimage hash verification failed 2047 1372cce2SMarian Balakowicz 126 common/image.c Ramdisk subimage hash verification OK 2048 1372cce2SMarian Balakowicz -126 common/image.c Ramdisk subimage for unsupported architecture 2049 1372cce2SMarian Balakowicz 127 common/image.c Architecture check OK 2050 1372cce2SMarian Balakowicz -127 common/image.c Can't get ramdisk subimage data/size 2051 1372cce2SMarian Balakowicz 128 common/image.c Got ramdisk subimage data/size 2052 1372cce2SMarian Balakowicz 129 common/image.c Can't get ramdisk load address 2053 1372cce2SMarian Balakowicz -129 common/image.c Got ramdisk load address 2054 1372cce2SMarian Balakowicz 2055 11ccc33fSMarcel Ziswiler -130 common/cmd_doc.c Incorrect FIT image format 2056 1372cce2SMarian Balakowicz 131 common/cmd_doc.c FIT image format OK 2057 1372cce2SMarian Balakowicz 2058 11ccc33fSMarcel Ziswiler -140 common/cmd_ide.c Incorrect FIT image format 2059 1372cce2SMarian Balakowicz 141 common/cmd_ide.c FIT image format OK 2060 1372cce2SMarian Balakowicz 2061 11ccc33fSMarcel Ziswiler -150 common/cmd_nand.c Incorrect FIT image format 2062 1372cce2SMarian Balakowicz 151 common/cmd_nand.c FIT image format OK 2063 1372cce2SMarian Balakowicz 2064 1372cce2SMarian Balakowicz 2065 c609719bSwdenkModem Support: 2066 c609719bSwdenk-------------- 2067 c609719bSwdenk 2068 85ec0bccSwdenk[so far only for SMDK2400 and TRAB boards] 2069 c609719bSwdenk 2070 11ccc33fSMarcel Ziswiler- Modem support enable: 2071 c609719bSwdenk CONFIG_MODEM_SUPPORT 2072 c609719bSwdenk 2073 c609719bSwdenk- RTS/CTS Flow control enable: 2074 c609719bSwdenk CONFIG_HWFLOW 2075 c609719bSwdenk 2076 c609719bSwdenk- Modem debug support: 2077 c609719bSwdenk CONFIG_MODEM_SUPPORT_DEBUG 2078 c609719bSwdenk 2079 c609719bSwdenk Enables debugging stuff (char screen[1024], dbg()) 2080 c609719bSwdenk for modem support. Useful only with BDI2000. 2081 c609719bSwdenk 2082 a8c7c708Swdenk- Interrupt support (PPC): 2083 a8c7c708Swdenk 2084 a8c7c708Swdenk There are common interrupt_init() and timer_interrupt() 2085 a8c7c708Swdenk for all PPC archs. interrupt_init() calls interrupt_init_cpu() 2086 11ccc33fSMarcel Ziswiler for CPU specific initialization. interrupt_init_cpu() 2087 a8c7c708Swdenk should set decrementer_count to appropriate value. If 2088 11ccc33fSMarcel Ziswiler CPU resets decrementer automatically after interrupt 2089 a8c7c708Swdenk (ppc4xx) it should set decrementer_count to zero. 2090 11ccc33fSMarcel Ziswiler timer_interrupt() calls timer_interrupt_cpu() for CPU 2091 a8c7c708Swdenk specific handling. If board has watchdog / status_led 2092 a8c7c708Swdenk / other_activity_monitor it works automatically from 2093 a8c7c708Swdenk general timer_interrupt(). 2094 a8c7c708Swdenk 2095 c609719bSwdenk- General: 2096 c609719bSwdenk 2097 c609719bSwdenk In the target system modem support is enabled when a 2098 c609719bSwdenk specific key (key combination) is pressed during 2099 c609719bSwdenk power-on. Otherwise U-Boot will boot normally 2100 11ccc33fSMarcel Ziswiler (autoboot). The key_pressed() function is called from 2101 c609719bSwdenk board_init(). Currently key_pressed() is a dummy 2102 c609719bSwdenk function, returning 1 and thus enabling modem 2103 c609719bSwdenk initialization. 2104 c609719bSwdenk 2105 c609719bSwdenk If there are no modem init strings in the 2106 c609719bSwdenk environment, U-Boot proceed to autoboot; the 2107 c609719bSwdenk previous output (banner, info printfs) will be 2108 11ccc33fSMarcel Ziswiler suppressed, though. 2109 c609719bSwdenk 2110 c609719bSwdenk See also: doc/README.Modem 2111 c609719bSwdenk 2112 c609719bSwdenk 2113 c609719bSwdenkConfiguration Settings: 2114 c609719bSwdenk----------------------- 2115 c609719bSwdenk 2116 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_LONGHELP: Defined when you want long help messages included; 2117 c609719bSwdenk undefine this when you're short of memory. 2118 c609719bSwdenk 2119 2fb2604dSPeter Tyser- CONFIG_SYS_HELP_CMD_WIDTH: Defined when you want to override the default 2120 2fb2604dSPeter Tyser width of the commands listed in the 'help' command output. 2121 2fb2604dSPeter Tyser 2122 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PROMPT: This is what U-Boot prints on the console to 2123 c609719bSwdenk prompt for user input. 2124 c609719bSwdenk 2125 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CBSIZE: Buffer size for input from the Console 2126 c609719bSwdenk 2127 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PBSIZE: Buffer size for Console output 2128 c609719bSwdenk 2129 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAXARGS: max. Number of arguments accepted for monitor commands 2130 c609719bSwdenk 2131 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BARGSIZE: Buffer size for Boot Arguments which are passed to 2132 c609719bSwdenk the application (usually a Linux kernel) when it is 2133 c609719bSwdenk booted 2134 c609719bSwdenk 2135 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BAUDRATE_TABLE: 2136 c609719bSwdenk List of legal baudrate settings for this board. 2137 c609719bSwdenk 2138 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_INFO_QUIET 2139 c609719bSwdenk Suppress display of console information at boot. 2140 c609719bSwdenk 2141 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_IS_IN_ENV 2142 c609719bSwdenk If the board specific function 2143 c609719bSwdenk extern int overwrite_console (void); 2144 c609719bSwdenk returns 1, the stdin, stderr and stdout are switched to the 2145 c609719bSwdenk serial port, else the settings in the environment are used. 2146 c609719bSwdenk 2147 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE 2148 c609719bSwdenk Enable the call to overwrite_console(). 2149 c609719bSwdenk 2150 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_ENV_OVERWRITE 2151 c609719bSwdenk Enable overwrite of previous console environment settings. 2152 c609719bSwdenk 2153 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEMTEST_START, CONFIG_SYS_MEMTEST_END: 2154 c609719bSwdenk Begin and End addresses of the area used by the 2155 c609719bSwdenk simple memory test. 2156 c609719bSwdenk 2157 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_ALT_MEMTEST: 2158 c609719bSwdenk Enable an alternate, more extensive memory test. 2159 c609719bSwdenk 2160 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEMTEST_SCRATCH: 2161 5f535fe1Swdenk Scratch address used by the alternate memory test 2162 5f535fe1Swdenk You only need to set this if address zero isn't writeable 2163 5f535fe1Swdenk 2164 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEM_TOP_HIDE (PPC only): 2165 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD If CONFIG_SYS_MEM_TOP_HIDE is defined in the board config header, 2166 14f73ca6SStefan Roese this specified memory area will get subtracted from the top 2167 11ccc33fSMarcel Ziswiler (end) of RAM and won't get "touched" at all by U-Boot. By 2168 14f73ca6SStefan Roese fixing up gd->ram_size the Linux kernel should gets passed 2169 14f73ca6SStefan Roese the now "corrected" memory size and won't touch it either. 2170 14f73ca6SStefan Roese This should work for arch/ppc and arch/powerpc. Only Linux 2171 5e12e75dSStefan Roese board ports in arch/powerpc with bootwrapper support that 2172 14f73ca6SStefan Roese recalculate the memory size from the SDRAM controller setup 2173 5e12e75dSStefan Roese will have to get fixed in Linux additionally. 2174 14f73ca6SStefan Roese 2175 14f73ca6SStefan Roese This option can be used as a workaround for the 440EPx/GRx 2176 14f73ca6SStefan Roese CHIP 11 errata where the last 256 bytes in SDRAM shouldn't 2177 14f73ca6SStefan Roese be touched. 2178 14f73ca6SStefan Roese 2179 14f73ca6SStefan Roese WARNING: Please make sure that this value is a multiple of 2180 14f73ca6SStefan Roese the Linux page size (normally 4k). If this is not the case, 2181 14f73ca6SStefan Roese then the end address of the Linux memory will be located at a 2182 14f73ca6SStefan Roese non page size aligned address and this could cause major 2183 14f73ca6SStefan Roese problems. 2184 14f73ca6SStefan Roese 2185 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_TFTP_LOADADDR: 2186 c609719bSwdenk Default load address for network file downloads 2187 c609719bSwdenk 2188 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_LOADS_BAUD_CHANGE: 2189 c609719bSwdenk Enable temporary baudrate change while serial download 2190 c609719bSwdenk 2191 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SDRAM_BASE: 2192 c609719bSwdenk Physical start address of SDRAM. _Must_ be 0 here. 2193 c609719bSwdenk 2194 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MBIO_BASE: 2195 c609719bSwdenk Physical start address of Motherboard I/O (if using a 2196 c609719bSwdenk Cogent motherboard) 2197 c609719bSwdenk 2198 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_BASE: 2199 c609719bSwdenk Physical start address of Flash memory. 2200 c609719bSwdenk 2201 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MONITOR_BASE: 2202 c609719bSwdenk Physical start address of boot monitor code (set by 2203 c609719bSwdenk make config files to be same as the text base address 2204 c609719bSwdenk (TEXT_BASE) used when linking) - same as 2205 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_FLASH_BASE when booting from flash. 2206 c609719bSwdenk 2207 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MONITOR_LEN: 2208 3b57fe0aSwdenk Size of memory reserved for monitor code, used to 2209 3b57fe0aSwdenk determine _at_compile_time_ (!) if the environment is 2210 3b57fe0aSwdenk embedded within the U-Boot image, or in a separate 2211 3b57fe0aSwdenk flash sector. 2212 c609719bSwdenk 2213 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MALLOC_LEN: 2214 c609719bSwdenk Size of DRAM reserved for malloc() use. 2215 c609719bSwdenk 2216 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BOOTM_LEN: 2217 15940c9aSStefan Roese Normally compressed uImages are limited to an 2218 15940c9aSStefan Roese uncompressed size of 8 MBytes. If this is not enough, 2219 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD you can define CONFIG_SYS_BOOTM_LEN in your board config file 2220 15940c9aSStefan Roese to adjust this setting to your needs. 2221 c609719bSwdenk 2222 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BOOTMAPSZ: 2223 c609719bSwdenk Maximum size of memory mapped by the startup code of 2224 c609719bSwdenk the Linux kernel; all data that must be processed by 2225 7d721e34SBartlomiej Sieka the Linux kernel (bd_info, boot arguments, FDT blob if 2226 7d721e34SBartlomiej Sieka used) must be put below this limit, unless "bootm_low" 2227 7d721e34SBartlomiej Sieka enviroment variable is defined and non-zero. In such case 2228 7d721e34SBartlomiej Sieka all data for the Linux kernel must be between "bootm_low" 2229 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD and "bootm_low" + CONFIG_SYS_BOOTMAPSZ. 2230 c609719bSwdenk 2231 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAX_FLASH_BANKS: 2232 c609719bSwdenk Max number of Flash memory banks 2233 c609719bSwdenk 2234 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAX_FLASH_SECT: 2235 c609719bSwdenk Max number of sectors on a Flash chip 2236 c609719bSwdenk 2237 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_ERASE_TOUT: 2238 c609719bSwdenk Timeout for Flash erase operations (in ms) 2239 c609719bSwdenk 2240 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_WRITE_TOUT: 2241 c609719bSwdenk Timeout for Flash write operations (in ms) 2242 c609719bSwdenk 2243 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_LOCK_TOUT 2244 8564acf9Swdenk Timeout for Flash set sector lock bit operation (in ms) 2245 8564acf9Swdenk 2246 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_UNLOCK_TOUT 2247 8564acf9Swdenk Timeout for Flash clear lock bits operation (in ms) 2248 8564acf9Swdenk 2249 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_PROTECTION 2250 8564acf9Swdenk If defined, hardware flash sectors protection is used 2251 8564acf9Swdenk instead of U-Boot software protection. 2252 8564acf9Swdenk 2253 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DIRECT_FLASH_TFTP: 2254 c609719bSwdenk 2255 c609719bSwdenk Enable TFTP transfers directly to flash memory; 2256 c609719bSwdenk without this option such a download has to be 2257 c609719bSwdenk performed in two steps: (1) download to RAM, and (2) 2258 c609719bSwdenk copy from RAM to flash. 2259 c609719bSwdenk 2260 c609719bSwdenk The two-step approach is usually more reliable, since 2261 c609719bSwdenk you can check if the download worked before you erase 2262 11ccc33fSMarcel Ziswiler the flash, but in some situations (when system RAM is 2263 11ccc33fSMarcel Ziswiler too limited to allow for a temporary copy of the 2264 c609719bSwdenk downloaded image) this option may be very useful. 2265 c609719bSwdenk 2266 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_CFI: 2267 c609719bSwdenk Define if the flash driver uses extra elements in the 2268 5653fc33Swdenk common flash structure for storing flash geometry. 2269 5653fc33Swdenk 2270 00b1883aSJean-Christophe PLAGNIOL-VILLARD- CONFIG_FLASH_CFI_DRIVER 2271 5653fc33Swdenk This option also enables the building of the cfi_flash driver 2272 5653fc33Swdenk in the drivers directory 2273 53cf9435Sstroese 2274 91809ed5SPiotr Ziecik- CONFIG_FLASH_CFI_MTD 2275 91809ed5SPiotr Ziecik This option enables the building of the cfi_mtd driver 2276 91809ed5SPiotr Ziecik in the drivers directory. The driver exports CFI flash 2277 91809ed5SPiotr Ziecik to the MTD layer. 2278 91809ed5SPiotr Ziecik 2279 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_USE_BUFFER_WRITE 2280 96ef831fSGuennadi Liakhovetski Use buffered writes to flash. 2281 96ef831fSGuennadi Liakhovetski 2282 96ef831fSGuennadi Liakhovetski- CONFIG_FLASH_SPANSION_S29WS_N 2283 96ef831fSGuennadi Liakhovetski s29ws-n MirrorBit flash has non-standard addresses for buffered 2284 96ef831fSGuennadi Liakhovetski write commands. 2285 96ef831fSGuennadi Liakhovetski 2286 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_QUIET_TEST 2287 5568e613SStefan Roese If this option is defined, the common CFI flash doesn't 2288 5568e613SStefan Roese print it's warning upon not recognized FLASH banks. This 2289 5568e613SStefan Roese is useful, if some of the configured banks are only 2290 5568e613SStefan Roese optionally available. 2291 5568e613SStefan Roese 2292 9a042e9cSJerry Van Baren- CONFIG_FLASH_SHOW_PROGRESS 2293 9a042e9cSJerry Van Baren If defined (must be an integer), print out countdown 2294 9a042e9cSJerry Van Baren digits and dots. Recommended value: 45 (9..1) for 80 2295 9a042e9cSJerry Van Baren column displays, 15 (3..1) for 40 column displays. 2296 9a042e9cSJerry Van Baren 2297 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_RX_ETH_BUFFER: 2298 11ccc33fSMarcel Ziswiler Defines the number of Ethernet receive buffers. On some 2299 11ccc33fSMarcel Ziswiler Ethernet controllers it is recommended to set this value 2300 53cf9435Sstroese to 8 or even higher (EEPRO100 or 405 EMAC), since all 2301 53cf9435Sstroese buffers can be full shortly after enabling the interface 2302 11ccc33fSMarcel Ziswiler on high Ethernet traffic. 2303 53cf9435Sstroese Defaults to 4 if not defined. 2304 c609719bSwdenk 2305 c609719bSwdenkThe following definitions that deal with the placement and management 2306 c609719bSwdenkof environment data (variable area); in general, we support the 2307 c609719bSwdenkfollowing configurations: 2308 c609719bSwdenk 2309 5a1aceb0SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_FLASH: 2310 c609719bSwdenk 2311 c609719bSwdenk Define this if the environment is in flash memory. 2312 c609719bSwdenk 2313 c609719bSwdenk a) The environment occupies one whole flash sector, which is 2314 c609719bSwdenk "embedded" in the text segment with the U-Boot code. This 2315 c609719bSwdenk happens usually with "bottom boot sector" or "top boot 2316 c609719bSwdenk sector" type flash chips, which have several smaller 2317 c609719bSwdenk sectors at the start or the end. For instance, such a 2318 c609719bSwdenk layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In 2319 c609719bSwdenk such a case you would place the environment in one of the 2320 c609719bSwdenk 4 kB sectors - with U-Boot code before and after it. With 2321 c609719bSwdenk "top boot sector" type flash chips, you would put the 2322 c609719bSwdenk environment in one of the last sectors, leaving a gap 2323 c609719bSwdenk between U-Boot and the environment. 2324 c609719bSwdenk 2325 0e8d1586SJean-Christophe PLAGNIOL-VILLARD - CONFIG_ENV_OFFSET: 2326 c609719bSwdenk 2327 c609719bSwdenk Offset of environment data (variable area) to the 2328 c609719bSwdenk beginning of flash memory; for instance, with bottom boot 2329 c609719bSwdenk type flash chips the second sector can be used: the offset 2330 c609719bSwdenk for this sector is given here. 2331 c609719bSwdenk 2332 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_ENV_OFFSET is used relative to CONFIG_SYS_FLASH_BASE. 2333 c609719bSwdenk 2334 0e8d1586SJean-Christophe PLAGNIOL-VILLARD - CONFIG_ENV_ADDR: 2335 c609719bSwdenk 2336 c609719bSwdenk This is just another way to specify the start address of 2337 c609719bSwdenk the flash sector containing the environment (instead of 2338 0e8d1586SJean-Christophe PLAGNIOL-VILLARD CONFIG_ENV_OFFSET). 2339 c609719bSwdenk 2340 0e8d1586SJean-Christophe PLAGNIOL-VILLARD - CONFIG_ENV_SECT_SIZE: 2341 c609719bSwdenk 2342 c609719bSwdenk Size of the sector containing the environment. 2343 c609719bSwdenk 2344 c609719bSwdenk 2345 c609719bSwdenk b) Sometimes flash chips have few, equal sized, BIG sectors. 2346 c609719bSwdenk In such a case you don't want to spend a whole sector for 2347 c609719bSwdenk the environment. 2348 c609719bSwdenk 2349 0e8d1586SJean-Christophe PLAGNIOL-VILLARD - CONFIG_ENV_SIZE: 2350 c609719bSwdenk 2351 5a1aceb0SJean-Christophe PLAGNIOL-VILLARD If you use this in combination with CONFIG_ENV_IS_IN_FLASH 2352 0e8d1586SJean-Christophe PLAGNIOL-VILLARD and CONFIG_ENV_SECT_SIZE, you can specify to use only a part 2353 c609719bSwdenk of this flash sector for the environment. This saves 2354 c609719bSwdenk memory for the RAM copy of the environment. 2355 c609719bSwdenk 2356 c609719bSwdenk It may also save flash memory if you decide to use this 2357 c609719bSwdenk when your environment is "embedded" within U-Boot code, 2358 c609719bSwdenk since then the remainder of the flash sector could be used 2359 c609719bSwdenk for U-Boot code. It should be pointed out that this is 2360 c609719bSwdenk STRONGLY DISCOURAGED from a robustness point of view: 2361 c609719bSwdenk updating the environment in flash makes it always 2362 c609719bSwdenk necessary to erase the WHOLE sector. If something goes 2363 c609719bSwdenk wrong before the contents has been restored from a copy in 2364 c609719bSwdenk RAM, your target system will be dead. 2365 c609719bSwdenk 2366 0e8d1586SJean-Christophe PLAGNIOL-VILLARD - CONFIG_ENV_ADDR_REDUND 2367 0e8d1586SJean-Christophe PLAGNIOL-VILLARD CONFIG_ENV_SIZE_REDUND 2368 c609719bSwdenk 2369 c609719bSwdenk These settings describe a second storage area used to hold 2370 11ccc33fSMarcel Ziswiler a redundant copy of the environment data, so that there is 2371 3e38691eSwdenk a valid backup copy in case there is a power failure during 2372 c609719bSwdenk a "saveenv" operation. 2373 c609719bSwdenk 2374 c609719bSwdenkBE CAREFUL! Any changes to the flash layout, and some changes to the 2375 c609719bSwdenksource code will make it necessary to adapt <board>/u-boot.lds* 2376 c609719bSwdenkaccordingly! 2377 c609719bSwdenk 2378 c609719bSwdenk 2379 9314cee6SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_NVRAM: 2380 c609719bSwdenk 2381 c609719bSwdenk Define this if you have some non-volatile memory device 2382 c609719bSwdenk (NVRAM, battery buffered SRAM) which you want to use for the 2383 c609719bSwdenk environment. 2384 c609719bSwdenk 2385 0e8d1586SJean-Christophe PLAGNIOL-VILLARD - CONFIG_ENV_ADDR: 2386 0e8d1586SJean-Christophe PLAGNIOL-VILLARD - CONFIG_ENV_SIZE: 2387 c609719bSwdenk 2388 11ccc33fSMarcel Ziswiler These two #defines are used to determine the memory area you 2389 c609719bSwdenk want to use for environment. It is assumed that this memory 2390 c609719bSwdenk can just be read and written to, without any special 2391 c609719bSwdenk provision. 2392 c609719bSwdenk 2393 c609719bSwdenkBE CAREFUL! The first access to the environment happens quite early 2394 c609719bSwdenkin U-Boot initalization (when we try to get the setting of for the 2395 11ccc33fSMarcel Ziswilerconsole baudrate). You *MUST* have mapped your NVRAM area then, or 2396 c609719bSwdenkU-Boot will hang. 2397 c609719bSwdenk 2398 c609719bSwdenkPlease note that even with NVRAM we still use a copy of the 2399 c609719bSwdenkenvironment in RAM: we could work on NVRAM directly, but we want to 2400 c609719bSwdenkkeep settings there always unmodified except somebody uses "saveenv" 2401 c609719bSwdenkto save the current settings. 2402 c609719bSwdenk 2403 c609719bSwdenk 2404 bb1f8b4fSJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_EEPROM: 2405 c609719bSwdenk 2406 c609719bSwdenk Use this if you have an EEPROM or similar serial access 2407 c609719bSwdenk device and a driver for it. 2408 c609719bSwdenk 2409 0e8d1586SJean-Christophe PLAGNIOL-VILLARD - CONFIG_ENV_OFFSET: 2410 0e8d1586SJean-Christophe PLAGNIOL-VILLARD - CONFIG_ENV_SIZE: 2411 c609719bSwdenk 2412 c609719bSwdenk These two #defines specify the offset and size of the 2413 c609719bSwdenk environment area within the total memory of your EEPROM. 2414 c609719bSwdenk 2415 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD - CONFIG_SYS_I2C_EEPROM_ADDR: 2416 c609719bSwdenk If defined, specified the chip address of the EEPROM device. 2417 c609719bSwdenk The default address is zero. 2418 c609719bSwdenk 2419 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD - CONFIG_SYS_EEPROM_PAGE_WRITE_BITS: 2420 c609719bSwdenk If defined, the number of bits used to address bytes in a 2421 c609719bSwdenk single page in the EEPROM device. A 64 byte page, for example 2422 c609719bSwdenk would require six bits. 2423 c609719bSwdenk 2424 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD - CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS: 2425 c609719bSwdenk If defined, the number of milliseconds to delay between 2426 c609719bSwdenk page writes. The default is zero milliseconds. 2427 c609719bSwdenk 2428 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD - CONFIG_SYS_I2C_EEPROM_ADDR_LEN: 2429 c609719bSwdenk The length in bytes of the EEPROM memory array address. Note 2430 c609719bSwdenk that this is NOT the chip address length! 2431 c609719bSwdenk 2432 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD - CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW: 2433 5cf91d6bSwdenk EEPROM chips that implement "address overflow" are ones 2434 5cf91d6bSwdenk like Catalyst 24WC04/08/16 which has 9/10/11 bits of 2435 5cf91d6bSwdenk address and the extra bits end up in the "chip address" bit 2436 5cf91d6bSwdenk slots. This makes a 24WC08 (1Kbyte) chip look like four 256 2437 5cf91d6bSwdenk byte chips. 2438 5cf91d6bSwdenk 2439 5cf91d6bSwdenk Note that we consider the length of the address field to 2440 5cf91d6bSwdenk still be one byte because the extra address bits are hidden 2441 5cf91d6bSwdenk in the chip address. 2442 5cf91d6bSwdenk 2443 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD - CONFIG_SYS_EEPROM_SIZE: 2444 c609719bSwdenk The size in bytes of the EEPROM device. 2445 c609719bSwdenk 2446 c609719bSwdenk 2447 057c849cSJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_DATAFLASH: 2448 5779d8d9Swdenk 2449 5779d8d9Swdenk Define this if you have a DataFlash memory device which you 2450 5779d8d9Swdenk want to use for the environment. 2451 5779d8d9Swdenk 2452 0e8d1586SJean-Christophe PLAGNIOL-VILLARD - CONFIG_ENV_OFFSET: 2453 0e8d1586SJean-Christophe PLAGNIOL-VILLARD - CONFIG_ENV_ADDR: 2454 0e8d1586SJean-Christophe PLAGNIOL-VILLARD - CONFIG_ENV_SIZE: 2455 5779d8d9Swdenk 2456 5779d8d9Swdenk These three #defines specify the offset and size of the 2457 5779d8d9Swdenk environment area within the total memory of your DataFlash placed 2458 5779d8d9Swdenk at the specified address. 2459 5779d8d9Swdenk 2460 51bfee19SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_NAND: 2461 13a5695bSwdenk 2462 13a5695bSwdenk Define this if you have a NAND device which you want to use 2463 13a5695bSwdenk for the environment. 2464 13a5695bSwdenk 2465 0e8d1586SJean-Christophe PLAGNIOL-VILLARD - CONFIG_ENV_OFFSET: 2466 0e8d1586SJean-Christophe PLAGNIOL-VILLARD - CONFIG_ENV_SIZE: 2467 13a5695bSwdenk 2468 13a5695bSwdenk These two #defines specify the offset and size of the environment 2469 13a5695bSwdenk area within the first NAND device. 2470 5779d8d9Swdenk 2471 0e8d1586SJean-Christophe PLAGNIOL-VILLARD - CONFIG_ENV_OFFSET_REDUND 2472 e443c944SMarkus Klotzbuecher 2473 0e8d1586SJean-Christophe PLAGNIOL-VILLARD This setting describes a second storage area of CONFIG_ENV_SIZE 2474 e443c944SMarkus Klotzbuecher size used to hold a redundant copy of the environment data, 2475 e443c944SMarkus Klotzbuecher so that there is a valid backup copy in case there is a 2476 e443c944SMarkus Klotzbuecher power failure during a "saveenv" operation. 2477 e443c944SMarkus Klotzbuecher 2478 0e8d1586SJean-Christophe PLAGNIOL-VILLARD Note: CONFIG_ENV_OFFSET and CONFIG_ENV_OFFSET_REDUND must be aligned 2479 0e8d1586SJean-Christophe PLAGNIOL-VILLARD to a block boundary, and CONFIG_ENV_SIZE must be a multiple of 2480 e443c944SMarkus Klotzbuecher the NAND devices block size. 2481 e443c944SMarkus Klotzbuecher 2482 b74ab737SGuennadi Liakhovetski- CONFIG_NAND_ENV_DST 2483 b74ab737SGuennadi Liakhovetski 2484 b74ab737SGuennadi Liakhovetski Defines address in RAM to which the nand_spl code should copy the 2485 b74ab737SGuennadi Liakhovetski environment. If redundant environment is used, it will be copied to 2486 b74ab737SGuennadi Liakhovetski CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE. 2487 b74ab737SGuennadi Liakhovetski 2488 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPI_INIT_OFFSET 2489 c609719bSwdenk 2490 c609719bSwdenk Defines offset to the initial SPI buffer area in DPRAM. The 2491 c609719bSwdenk area is used at an early stage (ROM part) if the environment 2492 c609719bSwdenk is configured to reside in the SPI EEPROM: We need a 520 byte 2493 c609719bSwdenk scratch DPRAM area. It is used between the two initialization 2494 c609719bSwdenk calls (spi_init_f() and spi_init_r()). A value of 0xB00 seems 2495 c609719bSwdenk to be a good choice since it makes it far enough from the 2496 c609719bSwdenk start of the data area as well as from the stack pointer. 2497 c609719bSwdenk 2498 e881cb56SBruce AdlerPlease note that the environment is read-only until the monitor 2499 c609719bSwdenkhas been relocated to RAM and a RAM copy of the environment has been 2500 c609719bSwdenkcreated; also, when using EEPROM you will have to use getenv_r() 2501 c609719bSwdenkuntil then to read environment variables. 2502 c609719bSwdenk 2503 85ec0bccSwdenkThe environment is protected by a CRC32 checksum. Before the monitor 2504 85ec0bccSwdenkis relocated into RAM, as a result of a bad CRC you will be working 2505 85ec0bccSwdenkwith the compiled-in default environment - *silently*!!! [This is 2506 85ec0bccSwdenknecessary, because the first environment variable we need is the 2507 85ec0bccSwdenk"baudrate" setting for the console - if we have a bad CRC, we don't 2508 85ec0bccSwdenkhave any device yet where we could complain.] 2509 c609719bSwdenk 2510 c609719bSwdenkNote: once the monitor has been relocated, then it will complain if 2511 c609719bSwdenkthe default environment is used; a new CRC is computed as soon as you 2512 85ec0bccSwdenkuse the "saveenv" command to store a valid environment. 2513 c609719bSwdenk 2514 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FAULT_ECHO_LINK_DOWN: 2515 fc3e2165Swdenk Echo the inverted Ethernet link state to the fault LED. 2516 fc3e2165Swdenk 2517 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD Note: If this option is active, then CONFIG_SYS_FAULT_MII_ADDR 2518 fc3e2165Swdenk also needs to be defined. 2519 fc3e2165Swdenk 2520 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FAULT_MII_ADDR: 2521 fc3e2165Swdenk MII address of the PHY to check for the Ethernet link state. 2522 c609719bSwdenk 2523 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_64BIT_VSPRINTF: 2524 c40b2956Swdenk Makes vsprintf (and all *printf functions) support printing 2525 c40b2956Swdenk of 64bit values by using the L quantifier 2526 c40b2956Swdenk 2527 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_64BIT_STRTOUL: 2528 c40b2956Swdenk Adds simple_strtoull that returns a 64bit value 2529 c40b2956Swdenk 2530 f5675aa5SRon Madrid- CONFIG_NS16550_MIN_FUNCTIONS: 2531 f5675aa5SRon Madrid Define this if you desire to only have use of the NS16550_init 2532 f5675aa5SRon Madrid and NS16550_putc functions for the serial driver located at 2533 f5675aa5SRon Madrid drivers/serial/ns16550.c. This option is useful for saving 2534 f5675aa5SRon Madrid space for already greatly restricted images, including but not 2535 f5675aa5SRon Madrid limited to NAND_SPL configurations. 2536 f5675aa5SRon Madrid 2537 c609719bSwdenkLow Level (hardware related) configuration options: 2538 dc7c9a1aSwdenk--------------------------------------------------- 2539 c609719bSwdenk 2540 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CACHELINE_SIZE: 2541 c609719bSwdenk Cache Line Size of the CPU. 2542 c609719bSwdenk 2543 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DEFAULT_IMMR: 2544 c609719bSwdenk Default address of the IMMR after system reset. 2545 2535d602Swdenk 2546 2535d602Swdenk Needed on some 8260 systems (MPC8260ADS, PQ2FADS-ZU, 2547 2535d602Swdenk and RPXsuper) to be able to adjust the position of 2548 2535d602Swdenk the IMMR register after a reset. 2549 c609719bSwdenk 2550 7f6c2cbcSwdenk- Floppy Disk Support: 2551 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_FDC_DRIVE_NUMBER 2552 7f6c2cbcSwdenk 2553 7f6c2cbcSwdenk the default drive number (default value 0) 2554 7f6c2cbcSwdenk 2555 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_ISA_IO_STRIDE 2556 7f6c2cbcSwdenk 2557 11ccc33fSMarcel Ziswiler defines the spacing between FDC chipset registers 2558 7f6c2cbcSwdenk (default value 1) 2559 7f6c2cbcSwdenk 2560 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_ISA_IO_OFFSET 2561 7f6c2cbcSwdenk 2562 7f6c2cbcSwdenk defines the offset of register from address. It 2563 7f6c2cbcSwdenk depends on which part of the data bus is connected to 2564 11ccc33fSMarcel Ziswiler the FDC chipset. (default value 0) 2565 7f6c2cbcSwdenk 2566 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD If CONFIG_SYS_ISA_IO_STRIDE CONFIG_SYS_ISA_IO_OFFSET and 2567 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_FDC_DRIVE_NUMBER are undefined, they take their 2568 7f6c2cbcSwdenk default value. 2569 7f6c2cbcSwdenk 2570 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD if CONFIG_SYS_FDC_HW_INIT is defined, then the function 2571 7f6c2cbcSwdenk fdc_hw_init() is called at the beginning of the FDC 2572 7f6c2cbcSwdenk setup. fdc_hw_init() must be provided by the board 2573 7f6c2cbcSwdenk source code. It is used to make hardware dependant 2574 7f6c2cbcSwdenk initializations. 2575 7f6c2cbcSwdenk 2576 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_IMMR: Physical address of the Internal Memory. 2577 25d6712aSwdenk DO NOT CHANGE unless you know exactly what you're 2578 25d6712aSwdenk doing! (11-4) [MPC8xx/82xx systems only] 2579 c609719bSwdenk 2580 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_INIT_RAM_ADDR: 2581 c609719bSwdenk 2582 7152b1d0Swdenk Start address of memory area that can be used for 2583 c609719bSwdenk initial data and stack; please note that this must be 2584 c609719bSwdenk writable memory that is working WITHOUT special 2585 c609719bSwdenk initialization, i. e. you CANNOT use normal RAM which 2586 c609719bSwdenk will become available only after programming the 2587 c609719bSwdenk memory controller and running certain initialization 2588 c609719bSwdenk sequences. 2589 c609719bSwdenk 2590 c609719bSwdenk U-Boot uses the following memory types: 2591 c609719bSwdenk - MPC8xx and MPC8260: IMMR (internal memory of the CPU) 2592 c609719bSwdenk - MPC824X: data cache 2593 c609719bSwdenk - PPC4xx: data cache 2594 c609719bSwdenk 2595 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_GBL_DATA_OFFSET: 2596 c609719bSwdenk 2597 c609719bSwdenk Offset of the initial data structure in the memory 2598 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD area defined by CONFIG_SYS_INIT_RAM_ADDR. Usually 2599 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_GBL_DATA_OFFSET is chosen such that the initial 2600 c609719bSwdenk data is located at the end of the available space 2601 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD (sometimes written as (CONFIG_SYS_INIT_RAM_END - 2602 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_INIT_DATA_SIZE), and the initial stack is just 2603 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD below that area (growing from (CONFIG_SYS_INIT_RAM_ADDR + 2604 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_GBL_DATA_OFFSET) downward. 2605 c609719bSwdenk 2606 c609719bSwdenk Note: 2607 c609719bSwdenk On the MPC824X (or other systems that use the data 2608 c609719bSwdenk cache for initial memory) the address chosen for 2609 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_INIT_RAM_ADDR is basically arbitrary - it must 2610 c609719bSwdenk point to an otherwise UNUSED address space between 2611 c609719bSwdenk the top of RAM and the start of the PCI space. 2612 c609719bSwdenk 2613 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SIUMCR: SIU Module Configuration (11-6) 2614 c609719bSwdenk 2615 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SYPCR: System Protection Control (11-9) 2616 c609719bSwdenk 2617 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_TBSCR: Time Base Status and Control (11-26) 2618 c609719bSwdenk 2619 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PISCR: Periodic Interrupt Status and Control (11-31) 2620 c609719bSwdenk 2621 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PLPRCR: PLL, Low-Power, and Reset Control Register (15-30) 2622 c609719bSwdenk 2623 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SCCR: System Clock and reset Control Register (15-27) 2624 c609719bSwdenk 2625 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_OR_TIMING_SDRAM: 2626 c609719bSwdenk SDRAM timing 2627 c609719bSwdenk 2628 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAMR_PTA: 2629 c609719bSwdenk periodic timer for refresh 2630 c609719bSwdenk 2631 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DER: Debug Event Register (37-47) 2632 c609719bSwdenk 2633 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CONFIG_SYS_REMAP_OR_AM, 2634 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_PRELIM_OR_AM, CONFIG_SYS_OR_TIMING_FLASH, CONFIG_SYS_OR0_REMAP, 2635 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_OR0_PRELIM, CONFIG_SYS_BR0_PRELIM, CONFIG_SYS_OR1_REMAP, CONFIG_SYS_OR1_PRELIM, 2636 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_BR1_PRELIM: 2637 c609719bSwdenk Memory Controller Definitions: BR0/1 and OR0/1 (FLASH) 2638 c609719bSwdenk 2639 c609719bSwdenk- SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE, 2640 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_OR_TIMING_SDRAM, CONFIG_SYS_OR2_PRELIM, CONFIG_SYS_BR2_PRELIM, 2641 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_OR3_PRELIM, CONFIG_SYS_BR3_PRELIM: 2642 c609719bSwdenk Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM) 2643 c609719bSwdenk 2644 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAMR_PTA, CONFIG_SYS_MPTPR_2BK_4K, CONFIG_SYS_MPTPR_1BK_4K, CONFIG_SYS_MPTPR_2BK_8K, 2645 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_MPTPR_1BK_8K, CONFIG_SYS_MAMR_8COL, CONFIG_SYS_MAMR_9COL: 2646 c609719bSwdenk Machine Mode Register and Memory Periodic Timer 2647 c609719bSwdenk Prescaler definitions (SDRAM timing) 2648 c609719bSwdenk 2649 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_I2C_UCODE_PATCH, CONFIG_SYS_I2C_DPMEM_OFFSET [0x1FC0]: 2650 c609719bSwdenk enable I2C microcode relocation patch (MPC8xx); 2651 c609719bSwdenk define relocation offset in DPRAM [DSP2] 2652 c609719bSwdenk 2653 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SMC_UCODE_PATCH, CONFIG_SYS_SMC_DPMEM_OFFSET [0x1FC0]: 2654 b423d055SHeiko Schocher enable SMC microcode relocation patch (MPC8xx); 2655 b423d055SHeiko Schocher define relocation offset in DPRAM [SMC1] 2656 b423d055SHeiko Schocher 2657 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPI_UCODE_PATCH, CONFIG_SYS_SPI_DPMEM_OFFSET [0x1FC0]: 2658 c609719bSwdenk enable SPI microcode relocation patch (MPC8xx); 2659 c609719bSwdenk define relocation offset in DPRAM [SCC4] 2660 c609719bSwdenk 2661 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_USE_OSCCLK: 2662 c609719bSwdenk Use OSCM clock mode on MBX8xx board. Be careful, 2663 c609719bSwdenk wrong setting might damage your board. Read 2664 c609719bSwdenk doc/README.MBX before setting this variable! 2665 c609719bSwdenk 2666 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CPM_POST_WORD_ADDR: (MPC8xx, MPC8260 only) 2667 ea909b76Swdenk Offset of the bootmode word in DPRAM used by post 2668 ea909b76Swdenk (Power On Self Tests). This definition overrides 2669 ea909b76Swdenk #define'd default value in commproc.h resp. 2670 ea909b76Swdenk cpm_8260.h. 2671 ea909b76Swdenk 2672 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PCI_SLV_MEM_LOCAL, CONFIG_SYS_PCI_SLV_MEM_BUS, CONFIG_SYS_PICMR0_MASK_ATTRIB, 2673 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_PCI_MSTR0_LOCAL, CONFIG_SYS_PCIMSK0_MASK, CONFIG_SYS_PCI_MSTR1_LOCAL, 2674 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_PCIMSK1_MASK, CONFIG_SYS_PCI_MSTR_MEM_LOCAL, CONFIG_SYS_PCI_MSTR_MEM_BUS, 2675 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_CPU_PCI_MEM_START, CONFIG_SYS_PCI_MSTR_MEM_SIZE, CONFIG_SYS_POCMR0_MASK_ATTRIB, 2676 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_PCI_MSTR_MEMIO_LOCAL, CONFIG_SYS_PCI_MSTR_MEMIO_BUS, CPU_PCI_MEMIO_START, 2677 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_PCI_MSTR_MEMIO_SIZE, CONFIG_SYS_POCMR1_MASK_ATTRIB, CONFIG_SYS_PCI_MSTR_IO_LOCAL, 2678 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_PCI_MSTR_IO_BUS, CONFIG_SYS_CPU_PCI_IO_START, CONFIG_SYS_PCI_MSTR_IO_SIZE, 2679 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_POCMR2_MASK_ATTRIB: (MPC826x only) 2680 5d232d0eSwdenk Overrides the default PCI memory map in cpu/mpc8260/pci.c if set. 2681 5d232d0eSwdenk 2682 9cacf4fcSDirk Eibach- CONFIG_PCI_DISABLE_PCIE: 2683 9cacf4fcSDirk Eibach Disable PCI-Express on systems where it is supported but not 2684 9cacf4fcSDirk Eibach required. 2685 9cacf4fcSDirk Eibach 2686 bb99ad6dSBen Warren- CONFIG_SPD_EEPROM 2687 218ca724SWolfgang Denk Get DDR timing information from an I2C EEPROM. Common 2688 218ca724SWolfgang Denk with pluggable memory modules such as SODIMMs 2689 218ca724SWolfgang Denk 2690 bb99ad6dSBen Warren SPD_EEPROM_ADDRESS 2691 bb99ad6dSBen Warren I2C address of the SPD EEPROM 2692 bb99ad6dSBen Warren 2693 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPD_BUS_NUM 2694 218ca724SWolfgang Denk If SPD EEPROM is on an I2C bus other than the first 2695 218ca724SWolfgang Denk one, specify here. Note that the value must resolve 2696 218ca724SWolfgang Denk to something your driver can deal with. 2697 bb99ad6dSBen Warren 2698 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_83XX_DDR_USES_CS0 2699 218ca724SWolfgang Denk Only for 83xx systems. If specified, then DDR should 2700 218ca724SWolfgang Denk be configured using CS0 and CS1 instead of CS2 and CS3. 2701 2ad6b513STimur Tabi 2702 c26e454dSwdenk- CONFIG_ETHER_ON_FEC[12] 2703 c26e454dSwdenk Define to enable FEC[12] on a 8xx series processor. 2704 c26e454dSwdenk 2705 c26e454dSwdenk- CONFIG_FEC[12]_PHY 2706 c26e454dSwdenk Define to the hardcoded PHY address which corresponds 2707 6e592385Swdenk to the given FEC; i. e. 2708 c26e454dSwdenk #define CONFIG_FEC1_PHY 4 2709 c26e454dSwdenk means that the PHY with address 4 is connected to FEC1 2710 c26e454dSwdenk 2711 c26e454dSwdenk When set to -1, means to probe for first available. 2712 c26e454dSwdenk 2713 c26e454dSwdenk- CONFIG_FEC[12]_PHY_NORXERR 2714 c26e454dSwdenk The PHY does not have a RXERR line (RMII only). 2715 c26e454dSwdenk (so program the FEC to ignore it). 2716 c26e454dSwdenk 2717 c26e454dSwdenk- CONFIG_RMII 2718 c26e454dSwdenk Enable RMII mode for all FECs. 2719 c26e454dSwdenk Note that this is a global option, we can't 2720 c26e454dSwdenk have one FEC in standard MII mode and another in RMII mode. 2721 c26e454dSwdenk 2722 5cf91d6bSwdenk- CONFIG_CRC32_VERIFY 2723 5cf91d6bSwdenk Add a verify option to the crc32 command. 2724 5cf91d6bSwdenk The syntax is: 2725 5cf91d6bSwdenk 2726 5cf91d6bSwdenk => crc32 -v <address> <count> <crc32> 2727 5cf91d6bSwdenk 2728 5cf91d6bSwdenk Where address/count indicate a memory area 2729 5cf91d6bSwdenk and crc32 is the correct crc32 which the 2730 5cf91d6bSwdenk area should have. 2731 5cf91d6bSwdenk 2732 56523f12Swdenk- CONFIG_LOOPW 2733 56523f12Swdenk Add the "loopw" memory command. This only takes effect if 2734 602ad3b3SJon Loeliger the memory commands are activated globally (CONFIG_CMD_MEM). 2735 56523f12Swdenk 2736 7b466641Sstroese- CONFIG_MX_CYCLIC 2737 7b466641Sstroese Add the "mdc" and "mwc" memory commands. These are cyclic 2738 7b466641Sstroese "md/mw" commands. 2739 7b466641Sstroese Examples: 2740 7b466641Sstroese 2741 7b466641Sstroese => mdc.b 10 4 500 2742 7b466641Sstroese This command will print 4 bytes (10,11,12,13) each 500 ms. 2743 7b466641Sstroese 2744 7b466641Sstroese => mwc.l 100 12345678 10 2745 7b466641Sstroese This command will write 12345678 to address 100 all 10 ms. 2746 7b466641Sstroese 2747 7b466641Sstroese This only takes effect if the memory commands are activated 2748 602ad3b3SJon Loeliger globally (CONFIG_CMD_MEM). 2749 7b466641Sstroese 2750 8aa1a2d1Swdenk- CONFIG_SKIP_LOWLEVEL_INIT 2751 8aa1a2d1Swdenk- CONFIG_SKIP_RELOCATE_UBOOT 2752 8aa1a2d1Swdenk 2753 8aa1a2d1Swdenk [ARM only] If these variables are defined, then 2754 8aa1a2d1Swdenk certain low level initializations (like setting up 2755 8aa1a2d1Swdenk the memory controller) are omitted and/or U-Boot does 2756 8aa1a2d1Swdenk not relocate itself into RAM. 2757 8aa1a2d1Swdenk Normally these variables MUST NOT be defined. The 2758 8aa1a2d1Swdenk only exception is when U-Boot is loaded (to RAM) by 2759 8aa1a2d1Swdenk some other boot loader or by a debugger which 2760 11ccc33fSMarcel Ziswiler performs these initializations itself. 2761 8aa1a2d1Swdenk 2762 df81238bSMagnus Lilja- CONFIG_PRELOADER 2763 df81238bSMagnus Lilja 2764 df81238bSMagnus Lilja Modifies the behaviour of start.S when compiling a loader 2765 df81238bSMagnus Lilja that is executed before the actual U-Boot. E.g. when 2766 df81238bSMagnus Lilja compiling a NAND SPL. 2767 400558b5Swdenk 2768 c609719bSwdenkBuilding the Software: 2769 c609719bSwdenk====================== 2770 c609719bSwdenk 2771 218ca724SWolfgang DenkBuilding U-Boot has been tested in several native build environments 2772 218ca724SWolfgang Denkand in many different cross environments. Of course we cannot support 2773 218ca724SWolfgang Denkall possibly existing versions of cross development tools in all 2774 218ca724SWolfgang Denk(potentially obsolete) versions. In case of tool chain problems we 2775 218ca724SWolfgang Denkrecommend to use the ELDK (see http://www.denx.de/wiki/DULG/ELDK) 2776 218ca724SWolfgang Denkwhich is extensively used to build and test U-Boot. 2777 c609719bSwdenk 2778 218ca724SWolfgang DenkIf you are not using a native environment, it is assumed that you 2779 218ca724SWolfgang Denkhave GNU cross compiling tools available in your path. In this case, 2780 218ca724SWolfgang Denkyou must set the environment variable CROSS_COMPILE in your shell. 2781 218ca724SWolfgang DenkNote that no changes to the Makefile or any other source files are 2782 218ca724SWolfgang Denknecessary. For example using the ELDK on a 4xx CPU, please enter: 2783 c609719bSwdenk 2784 218ca724SWolfgang Denk $ CROSS_COMPILE=ppc_4xx- 2785 218ca724SWolfgang Denk $ export CROSS_COMPILE 2786 c609719bSwdenk 2787 2f8d396bSPeter TyserNote: If you wish to generate Windows versions of the utilities in 2788 2f8d396bSPeter Tyser the tools directory you can use the MinGW toolchain 2789 2f8d396bSPeter Tyser (http://www.mingw.org). Set your HOST tools to the MinGW 2790 2f8d396bSPeter Tyser toolchain and execute 'make tools'. For example: 2791 2f8d396bSPeter Tyser 2792 2f8d396bSPeter Tyser $ make HOSTCC=i586-mingw32msvc-gcc HOSTSTRIP=i586-mingw32msvc-strip tools 2793 2f8d396bSPeter Tyser 2794 2f8d396bSPeter Tyser Binaries such as tools/mkimage.exe will be created which can 2795 2f8d396bSPeter Tyser be executed on computers running Windows. 2796 2f8d396bSPeter Tyser 2797 c609719bSwdenkU-Boot is intended to be simple to build. After installing the 2798 c609719bSwdenksources you must configure U-Boot for one specific board type. This 2799 c609719bSwdenkis done by typing: 2800 c609719bSwdenk 2801 c609719bSwdenk make NAME_config 2802 c609719bSwdenk 2803 218ca724SWolfgang Denkwhere "NAME_config" is the name of one of the existing configu- 2804 218ca724SWolfgang Denkrations; see the main Makefile for supported names. 2805 54387ac9Swdenk 2806 c609719bSwdenkNote: for some board special configuration names may exist; check if 2807 c609719bSwdenk additional information is available from the board vendor; for 2808 2729af9dSwdenk instance, the TQM823L systems are available without (standard) 2809 2729af9dSwdenk or with LCD support. You can select such additional "features" 2810 11ccc33fSMarcel Ziswiler when choosing the configuration, i. e. 2811 c609719bSwdenk 2812 2729af9dSwdenk make TQM823L_config 2813 2729af9dSwdenk - will configure for a plain TQM823L, i. e. no LCD support 2814 c609719bSwdenk 2815 c609719bSwdenk make TQM823L_LCD_config 2816 c609719bSwdenk - will configure for a TQM823L with U-Boot console on LCD 2817 c609719bSwdenk 2818 c609719bSwdenk etc. 2819 c609719bSwdenk 2820 c609719bSwdenk 2821 c609719bSwdenkFinally, type "make all", and you should get some working U-Boot 2822 7152b1d0Swdenkimages ready for download to / installation on your system: 2823 c609719bSwdenk 2824 c609719bSwdenk- "u-boot.bin" is a raw binary image 2825 c609719bSwdenk- "u-boot" is an image in ELF binary format 2826 c609719bSwdenk- "u-boot.srec" is in Motorola S-Record format 2827 c609719bSwdenk 2828 baf31249SMarian BalakowiczBy default the build is performed locally and the objects are saved 2829 baf31249SMarian Balakowiczin the source directory. One of the two methods can be used to change 2830 baf31249SMarian Balakowiczthis behavior and build U-Boot to some external directory: 2831 baf31249SMarian Balakowicz 2832 baf31249SMarian Balakowicz1. Add O= to the make command line invocations: 2833 baf31249SMarian Balakowicz 2834 baf31249SMarian Balakowicz make O=/tmp/build distclean 2835 baf31249SMarian Balakowicz make O=/tmp/build NAME_config 2836 baf31249SMarian Balakowicz make O=/tmp/build all 2837 baf31249SMarian Balakowicz 2838 baf31249SMarian Balakowicz2. Set environment variable BUILD_DIR to point to the desired location: 2839 baf31249SMarian Balakowicz 2840 baf31249SMarian Balakowicz export BUILD_DIR=/tmp/build 2841 baf31249SMarian Balakowicz make distclean 2842 baf31249SMarian Balakowicz make NAME_config 2843 baf31249SMarian Balakowicz make all 2844 baf31249SMarian Balakowicz 2845 baf31249SMarian BalakowiczNote that the command line "O=" setting overrides the BUILD_DIR environment 2846 baf31249SMarian Balakowiczvariable. 2847 baf31249SMarian Balakowicz 2848 c609719bSwdenk 2849 c609719bSwdenkPlease be aware that the Makefiles assume you are using GNU make, so 2850 c609719bSwdenkfor instance on NetBSD you might need to use "gmake" instead of 2851 c609719bSwdenknative "make". 2852 c609719bSwdenk 2853 c609719bSwdenk 2854 c609719bSwdenkIf the system board that you have is not listed, then you will need 2855 c609719bSwdenkto port U-Boot to your hardware platform. To do this, follow these 2856 c609719bSwdenksteps: 2857 c609719bSwdenk 2858 c609719bSwdenk1. Add a new configuration option for your board to the toplevel 2859 85ec0bccSwdenk "Makefile" and to the "MAKEALL" script, using the existing 2860 85ec0bccSwdenk entries as examples. Note that here and at many other places 2861 7152b1d0Swdenk boards and other names are listed in alphabetical sort order. Please 2862 85ec0bccSwdenk keep this order. 2863 c609719bSwdenk2. Create a new directory to hold your board specific code. Add any 2864 85ec0bccSwdenk files you need. In your board directory, you will need at least 2865 85ec0bccSwdenk the "Makefile", a "<board>.c", "flash.c" and "u-boot.lds". 2866 85ec0bccSwdenk3. Create a new configuration file "include/configs/<board>.h" for 2867 85ec0bccSwdenk your board 2868 c609719bSwdenk3. If you're porting U-Boot to a new CPU, then also create a new 2869 c609719bSwdenk directory to hold your CPU specific code. Add any files you need. 2870 85ec0bccSwdenk4. Run "make <board>_config" with your new name. 2871 c609719bSwdenk5. Type "make", and you should get a working "u-boot.srec" file 2872 c609719bSwdenk to be installed on your target system. 2873 85ec0bccSwdenk6. Debug and solve any problems that might arise. 2874 c609719bSwdenk [Of course, this last step is much harder than it sounds.] 2875 c609719bSwdenk 2876 c609719bSwdenk 2877 c609719bSwdenkTesting of U-Boot Modifications, Ports to New Hardware, etc.: 2878 c609719bSwdenk============================================================== 2879 c609719bSwdenk 2880 c609719bSwdenkIf you have modified U-Boot sources (for instance added a new board 2881 c609719bSwdenkor support for new devices, a new CPU, etc.) you are expected to 2882 c609719bSwdenkprovide feedback to the other developers. The feedback normally takes 2883 c609719bSwdenkthe form of a "patch", i. e. a context diff against a certain (latest 2884 218ca724SWolfgang Denkofficial or latest in the git repository) version of U-Boot sources. 2885 c609719bSwdenk 2886 c609719bSwdenkBut before you submit such a patch, please verify that your modifi- 2887 c609719bSwdenkcation did not break existing code. At least make sure that *ALL* of 2888 c609719bSwdenkthe supported boards compile WITHOUT ANY compiler warnings. To do so, 2889 c609719bSwdenkjust run the "MAKEALL" script, which will configure and build U-Boot 2890 c609719bSwdenkfor ALL supported system. Be warned, this will take a while. You can 2891 7152b1d0Swdenkselect which (cross) compiler to use by passing a `CROSS_COMPILE' 2892 218ca724SWolfgang Denkenvironment variable to the script, i. e. to use the ELDK cross tools 2893 218ca724SWolfgang Denkyou can type 2894 c609719bSwdenk 2895 c609719bSwdenk CROSS_COMPILE=ppc_8xx- MAKEALL 2896 c609719bSwdenk 2897 c609719bSwdenkor to build on a native PowerPC system you can type 2898 c609719bSwdenk 2899 c609719bSwdenk CROSS_COMPILE=' ' MAKEALL 2900 c609719bSwdenk 2901 218ca724SWolfgang DenkWhen using the MAKEALL script, the default behaviour is to build 2902 218ca724SWolfgang DenkU-Boot in the source directory. This location can be changed by 2903 218ca724SWolfgang Denksetting the BUILD_DIR environment variable. Also, for each target 2904 218ca724SWolfgang Denkbuilt, the MAKEALL script saves two log files (<target>.ERR and 2905 218ca724SWolfgang Denk<target>.MAKEALL) in the <source dir>/LOG directory. This default 2906 218ca724SWolfgang Denklocation can be changed by setting the MAKEALL_LOGDIR environment 2907 218ca724SWolfgang Denkvariable. For example: 2908 baf31249SMarian Balakowicz 2909 baf31249SMarian Balakowicz export BUILD_DIR=/tmp/build 2910 baf31249SMarian Balakowicz export MAKEALL_LOGDIR=/tmp/log 2911 baf31249SMarian Balakowicz CROSS_COMPILE=ppc_8xx- MAKEALL 2912 baf31249SMarian Balakowicz 2913 218ca724SWolfgang DenkWith the above settings build objects are saved in the /tmp/build, 2914 218ca724SWolfgang Denklog files are saved in the /tmp/log and the source tree remains clean 2915 218ca724SWolfgang Denkduring the whole build process. 2916 baf31249SMarian Balakowicz 2917 baf31249SMarian Balakowicz 2918 c609719bSwdenkSee also "U-Boot Porting Guide" below. 2919 c609719bSwdenk 2920 c609719bSwdenk 2921 c609719bSwdenkMonitor Commands - Overview: 2922 c609719bSwdenk============================ 2923 c609719bSwdenk 2924 c609719bSwdenkgo - start application at address 'addr' 2925 c609719bSwdenkrun - run commands in an environment variable 2926 c609719bSwdenkbootm - boot application image from memory 2927 c609719bSwdenkbootp - boot image via network using BootP/TFTP protocol 2928 c609719bSwdenktftpboot- boot image via network using TFTP protocol 2929 c609719bSwdenk and env variables "ipaddr" and "serverip" 2930 c609719bSwdenk (and eventually "gatewayip") 2931 c609719bSwdenkrarpboot- boot image via network using RARP/TFTP protocol 2932 c609719bSwdenkdiskboot- boot from IDE devicebootd - boot default, i.e., run 'bootcmd' 2933 c609719bSwdenkloads - load S-Record file over serial line 2934 c609719bSwdenkloadb - load binary file over serial line (kermit mode) 2935 c609719bSwdenkmd - memory display 2936 c609719bSwdenkmm - memory modify (auto-incrementing) 2937 c609719bSwdenknm - memory modify (constant address) 2938 c609719bSwdenkmw - memory write (fill) 2939 c609719bSwdenkcp - memory copy 2940 c609719bSwdenkcmp - memory compare 2941 c609719bSwdenkcrc32 - checksum calculation 2942 0f89c54bSPeter Tyseri2c - I2C sub-system 2943 c609719bSwdenksspi - SPI utility commands 2944 c609719bSwdenkbase - print or set address offset 2945 c609719bSwdenkprintenv- print environment variables 2946 c609719bSwdenksetenv - set environment variables 2947 c609719bSwdenksaveenv - save environment variables to persistent storage 2948 c609719bSwdenkprotect - enable or disable FLASH write protection 2949 c609719bSwdenkerase - erase FLASH memory 2950 c609719bSwdenkflinfo - print FLASH memory information 2951 c609719bSwdenkbdinfo - print Board Info structure 2952 c609719bSwdenkiminfo - print header information for application image 2953 c609719bSwdenkconinfo - print console devices and informations 2954 c609719bSwdenkide - IDE sub-system 2955 c609719bSwdenkloop - infinite loop on address range 2956 56523f12Swdenkloopw - infinite write loop on address range 2957 c609719bSwdenkmtest - simple RAM test 2958 c609719bSwdenkicache - enable or disable instruction cache 2959 c609719bSwdenkdcache - enable or disable data cache 2960 c609719bSwdenkreset - Perform RESET of the CPU 2961 c609719bSwdenkecho - echo args to console 2962 c609719bSwdenkversion - print monitor version 2963 c609719bSwdenkhelp - print online help 2964 c609719bSwdenk? - alias for 'help' 2965 c609719bSwdenk 2966 c609719bSwdenk 2967 c609719bSwdenkMonitor Commands - Detailed Description: 2968 c609719bSwdenk======================================== 2969 c609719bSwdenk 2970 c609719bSwdenkTODO. 2971 c609719bSwdenk 2972 c609719bSwdenkFor now: just type "help <command>". 2973 c609719bSwdenk 2974 c609719bSwdenk 2975 c609719bSwdenkEnvironment Variables: 2976 c609719bSwdenk====================== 2977 c609719bSwdenk 2978 c609719bSwdenkU-Boot supports user configuration using Environment Variables which 2979 c609719bSwdenkcan be made persistent by saving to Flash memory. 2980 c609719bSwdenk 2981 c609719bSwdenkEnvironment Variables are set using "setenv", printed using 2982 c609719bSwdenk"printenv", and saved to Flash using "saveenv". Using "setenv" 2983 c609719bSwdenkwithout a value can be used to delete a variable from the 2984 c609719bSwdenkenvironment. As long as you don't save the environment you are 2985 c609719bSwdenkworking with an in-memory copy. In case the Flash area containing the 2986 c609719bSwdenkenvironment is erased by accident, a default environment is provided. 2987 c609719bSwdenk 2988 c609719bSwdenkSome configuration options can be set using Environment Variables: 2989 c609719bSwdenk 2990 c609719bSwdenk baudrate - see CONFIG_BAUDRATE 2991 c609719bSwdenk 2992 c609719bSwdenk bootdelay - see CONFIG_BOOTDELAY 2993 c609719bSwdenk 2994 c609719bSwdenk bootcmd - see CONFIG_BOOTCOMMAND 2995 c609719bSwdenk 2996 c609719bSwdenk bootargs - Boot arguments when booting an RTOS image 2997 c609719bSwdenk 2998 c609719bSwdenk bootfile - Name of the image to load with TFTP 2999 c609719bSwdenk 3000 7d721e34SBartlomiej Sieka bootm_low - Memory range available for image processing in the bootm 3001 7d721e34SBartlomiej Sieka command can be restricted. This variable is given as 3002 7d721e34SBartlomiej Sieka a hexadecimal number and defines lowest address allowed 3003 7d721e34SBartlomiej Sieka for use by the bootm command. See also "bootm_size" 3004 7d721e34SBartlomiej Sieka environment variable. Address defined by "bootm_low" is 3005 7d721e34SBartlomiej Sieka also the base of the initial memory mapping for the Linux 3006 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD kernel -- see the description of CONFIG_SYS_BOOTMAPSZ. 3007 7d721e34SBartlomiej Sieka 3008 7d721e34SBartlomiej Sieka bootm_size - Memory range available for image processing in the bootm 3009 7d721e34SBartlomiej Sieka command can be restricted. This variable is given as 3010 7d721e34SBartlomiej Sieka a hexadecimal number and defines the size of the region 3011 7d721e34SBartlomiej Sieka allowed for use by the bootm command. See also "bootm_low" 3012 7d721e34SBartlomiej Sieka environment variable. 3013 7d721e34SBartlomiej Sieka 3014 4bae9090SBartlomiej Sieka updatefile - Location of the software update file on a TFTP server, used 3015 4bae9090SBartlomiej Sieka by the automatic software update feature. Please refer to 3016 4bae9090SBartlomiej Sieka documentation in doc/README.update for more details. 3017 4bae9090SBartlomiej Sieka 3018 c609719bSwdenk autoload - if set to "no" (any string beginning with 'n'), 3019 c609719bSwdenk "bootp" will just load perform a lookup of the 3020 c609719bSwdenk configuration from the BOOTP server, but not try to 3021 c609719bSwdenk load any image using TFTP 3022 c609719bSwdenk 3023 c609719bSwdenk autostart - if set to "yes", an image loaded using the "bootp", 3024 c609719bSwdenk "rarpboot", "tftpboot" or "diskboot" commands will 3025 c609719bSwdenk be automatically started (by internally calling 3026 c609719bSwdenk "bootm") 3027 c609719bSwdenk 3028 4a6fd34bSwdenk If set to "no", a standalone image passed to the 3029 4a6fd34bSwdenk "bootm" command will be copied to the load address 3030 4a6fd34bSwdenk (and eventually uncompressed), but NOT be started. 3031 4a6fd34bSwdenk This can be used to load and uncompress arbitrary 3032 4a6fd34bSwdenk data. 3033 4a6fd34bSwdenk 3034 17ea1177Swdenk i2cfast - (PPC405GP|PPC405EP only) 3035 17ea1177Swdenk if set to 'y' configures Linux I2C driver for fast 3036 17ea1177Swdenk mode (400kHZ). This environment variable is used in 3037 17ea1177Swdenk initialization code. So, for changes to be effective 3038 17ea1177Swdenk it must be saved and board must be reset. 3039 17ea1177Swdenk 3040 c609719bSwdenk initrd_high - restrict positioning of initrd images: 3041 c609719bSwdenk If this variable is not set, initrd images will be 3042 c609719bSwdenk copied to the highest possible address in RAM; this 3043 c609719bSwdenk is usually what you want since it allows for 3044 c609719bSwdenk maximum initrd size. If for some reason you want to 3045 c609719bSwdenk make sure that the initrd image is loaded below the 3046 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_BOOTMAPSZ limit, you can set this environment 3047 c609719bSwdenk variable to a value of "no" or "off" or "0". 3048 c609719bSwdenk Alternatively, you can set it to a maximum upper 3049 c609719bSwdenk address to use (U-Boot will still check that it 3050 c609719bSwdenk does not overwrite the U-Boot stack and data). 3051 c609719bSwdenk 3052 c609719bSwdenk For instance, when you have a system with 16 MB 3053 7152b1d0Swdenk RAM, and want to reserve 4 MB from use by Linux, 3054 c609719bSwdenk you can do this by adding "mem=12M" to the value of 3055 c609719bSwdenk the "bootargs" variable. However, now you must make 3056 7152b1d0Swdenk sure that the initrd image is placed in the first 3057 c609719bSwdenk 12 MB as well - this can be done with 3058 c609719bSwdenk 3059 c609719bSwdenk setenv initrd_high 00c00000 3060 c609719bSwdenk 3061 38b99261Swdenk If you set initrd_high to 0xFFFFFFFF, this is an 3062 38b99261Swdenk indication to U-Boot that all addresses are legal 3063 38b99261Swdenk for the Linux kernel, including addresses in flash 3064 38b99261Swdenk memory. In this case U-Boot will NOT COPY the 3065 38b99261Swdenk ramdisk at all. This may be useful to reduce the 3066 38b99261Swdenk boot time on your system, but requires that this 3067 38b99261Swdenk feature is supported by your Linux kernel. 3068 38b99261Swdenk 3069 c609719bSwdenk ipaddr - IP address; needed for tftpboot command 3070 c609719bSwdenk 3071 c609719bSwdenk loadaddr - Default load address for commands like "bootp", 3072 dc7c9a1aSwdenk "rarpboot", "tftpboot", "loadb" or "diskboot" 3073 c609719bSwdenk 3074 c609719bSwdenk loads_echo - see CONFIG_LOADS_ECHO 3075 c609719bSwdenk 3076 c609719bSwdenk serverip - TFTP server IP address; needed for tftpboot command 3077 c609719bSwdenk 3078 c609719bSwdenk bootretry - see CONFIG_BOOT_RETRY_TIME 3079 c609719bSwdenk 3080 c609719bSwdenk bootdelaykey - see CONFIG_AUTOBOOT_DELAY_STR 3081 c609719bSwdenk 3082 c609719bSwdenk bootstopkey - see CONFIG_AUTOBOOT_STOP_STR 3083 c609719bSwdenk 3084 a3d991bdSwdenk ethprime - When CONFIG_NET_MULTI is enabled controls which 3085 a3d991bdSwdenk interface is used first. 3086 a3d991bdSwdenk 3087 a3d991bdSwdenk ethact - When CONFIG_NET_MULTI is enabled controls which 3088 a3d991bdSwdenk interface is currently active. For example you 3089 a3d991bdSwdenk can do the following 3090 a3d991bdSwdenk 3091 a3d991bdSwdenk => setenv ethact FEC ETHERNET 3092 a3d991bdSwdenk => ping 192.168.0.1 # traffic sent on FEC ETHERNET 3093 a3d991bdSwdenk => setenv ethact SCC ETHERNET 3094 a3d991bdSwdenk => ping 10.0.0.1 # traffic sent on SCC ETHERNET 3095 a3d991bdSwdenk 3096 e1692577SMatthias Fuchs ethrotate - When set to "no" U-Boot does not go through all 3097 e1692577SMatthias Fuchs available network interfaces. 3098 e1692577SMatthias Fuchs It just stays at the currently selected interface. 3099 e1692577SMatthias Fuchs 3100 a3d991bdSwdenk netretry - When set to "no" each network operation will 3101 a3d991bdSwdenk either succeed or fail without retrying. 3102 6e592385Swdenk When set to "once" the network operation will 3103 6e592385Swdenk fail when all the available network interfaces 3104 6e592385Swdenk are tried once without success. 3105 a3d991bdSwdenk Useful on scripts which control the retry operation 3106 a3d991bdSwdenk themselves. 3107 a3d991bdSwdenk 3108 b4e2f89dSJean-Christophe PLAGNIOL-VILLARD npe_ucode - set load address for the NPE microcode 3109 a1cf027aSJean-Christophe PLAGNIOL-VILLARD 3110 28cb9375SWolfgang Denk tftpsrcport - If this is set, the value is used for TFTP's 3111 ecb0ccd9SWolfgang Denk UDP source port. 3112 ecb0ccd9SWolfgang Denk 3113 28cb9375SWolfgang Denk tftpdstport - If this is set, the value is used for TFTP's UDP 3114 28cb9375SWolfgang Denk destination port instead of the Well Know Port 69. 3115 28cb9375SWolfgang Denk 3116 a3d991bdSwdenk vlan - When set to a value < 4095 the traffic over 3117 11ccc33fSMarcel Ziswiler Ethernet is encapsulated/received over 802.1q 3118 a3d991bdSwdenk VLAN tagged frames. 3119 c609719bSwdenk 3120 c609719bSwdenkThe following environment variables may be used and automatically 3121 c609719bSwdenkupdated by the network boot commands ("bootp" and "rarpboot"), 3122 c609719bSwdenkdepending the information provided by your boot server: 3123 c609719bSwdenk 3124 c609719bSwdenk bootfile - see above 3125 c609719bSwdenk dnsip - IP address of your Domain Name Server 3126 fe389a82Sstroese dnsip2 - IP address of your secondary Domain Name Server 3127 c609719bSwdenk gatewayip - IP address of the Gateway (Router) to use 3128 c609719bSwdenk hostname - Target hostname 3129 c609719bSwdenk ipaddr - see above 3130 c609719bSwdenk netmask - Subnet Mask 3131 c609719bSwdenk rootpath - Pathname of the root filesystem on the NFS server 3132 c609719bSwdenk serverip - see above 3133 c609719bSwdenk 3134 c609719bSwdenk 3135 c609719bSwdenkThere are two special Environment Variables: 3136 c609719bSwdenk 3137 c609719bSwdenk serial# - contains hardware identification information such 3138 c609719bSwdenk as type string and/or serial number 3139 c609719bSwdenk ethaddr - Ethernet address 3140 c609719bSwdenk 3141 c609719bSwdenkThese variables can be set only once (usually during manufacturing of 3142 c609719bSwdenkthe board). U-Boot refuses to delete or overwrite these variables 3143 c609719bSwdenkonce they have been set once. 3144 c609719bSwdenk 3145 c609719bSwdenk 3146 c1551ea8SstroeseFurther special Environment Variables: 3147 c1551ea8Sstroese 3148 c1551ea8Sstroese ver - Contains the U-Boot version string as printed 3149 c1551ea8Sstroese with the "version" command. This variable is 3150 c1551ea8Sstroese readonly (see CONFIG_VERSION_VARIABLE). 3151 c1551ea8Sstroese 3152 c1551ea8Sstroese 3153 c609719bSwdenkPlease note that changes to some configuration parameters may take 3154 c609719bSwdenkonly effect after the next boot (yes, that's just like Windoze :-). 3155 c609719bSwdenk 3156 c609719bSwdenk 3157 f07771ccSwdenkCommand Line Parsing: 3158 f07771ccSwdenk===================== 3159 f07771ccSwdenk 3160 f07771ccSwdenkThere are two different command line parsers available with U-Boot: 3161 7152b1d0Swdenkthe old "simple" one, and the much more powerful "hush" shell: 3162 f07771ccSwdenk 3163 f07771ccSwdenkOld, simple command line parser: 3164 f07771ccSwdenk-------------------------------- 3165 f07771ccSwdenk 3166 f07771ccSwdenk- supports environment variables (through setenv / saveenv commands) 3167 f07771ccSwdenk- several commands on one line, separated by ';' 3168 fe126d8bSWolfgang Denk- variable substitution using "... ${name} ..." syntax 3169 f07771ccSwdenk- special characters ('$', ';') can be escaped by prefixing with '\', 3170 f07771ccSwdenk for example: 3171 fe126d8bSWolfgang Denk setenv bootcmd bootm \${address} 3172 f07771ccSwdenk- You can also escape text by enclosing in single apostrophes, for example: 3173 f07771ccSwdenk setenv addip 'setenv bootargs $bootargs ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname::off' 3174 f07771ccSwdenk 3175 f07771ccSwdenkHush shell: 3176 f07771ccSwdenk----------- 3177 f07771ccSwdenk 3178 f07771ccSwdenk- similar to Bourne shell, with control structures like 3179 f07771ccSwdenk if...then...else...fi, for...do...done; while...do...done, 3180 f07771ccSwdenk until...do...done, ... 3181 f07771ccSwdenk- supports environment ("global") variables (through setenv / saveenv 3182 f07771ccSwdenk commands) and local shell variables (through standard shell syntax 3183 f07771ccSwdenk "name=value"); only environment variables can be used with "run" 3184 f07771ccSwdenk command 3185 f07771ccSwdenk 3186 f07771ccSwdenkGeneral rules: 3187 f07771ccSwdenk-------------- 3188 f07771ccSwdenk 3189 f07771ccSwdenk(1) If a command line (or an environment variable executed by a "run" 3190 f07771ccSwdenk command) contains several commands separated by semicolon, and 3191 f07771ccSwdenk one of these commands fails, then the remaining commands will be 3192 f07771ccSwdenk executed anyway. 3193 f07771ccSwdenk 3194 f07771ccSwdenk(2) If you execute several variables with one call to run (i. e. 3195 11ccc33fSMarcel Ziswiler calling run with a list of variables as arguments), any failing 3196 f07771ccSwdenk command will cause "run" to terminate, i. e. the remaining 3197 f07771ccSwdenk variables are not executed. 3198 f07771ccSwdenk 3199 c609719bSwdenkNote for Redundant Ethernet Interfaces: 3200 c609719bSwdenk======================================= 3201 c609719bSwdenk 3202 11ccc33fSMarcel ZiswilerSome boards come with redundant Ethernet interfaces; U-Boot supports 3203 c609719bSwdenksuch configurations and is capable of automatic selection of a 3204 7152b1d0Swdenk"working" interface when needed. MAC assignment works as follows: 3205 c609719bSwdenk 3206 c609719bSwdenkNetwork interfaces are numbered eth0, eth1, eth2, ... Corresponding 3207 c609719bSwdenkMAC addresses can be stored in the environment as "ethaddr" (=>eth0), 3208 c609719bSwdenk"eth1addr" (=>eth1), "eth2addr", ... 3209 c609719bSwdenk 3210 c609719bSwdenkIf the network interface stores some valid MAC address (for instance 3211 c609719bSwdenkin SROM), this is used as default address if there is NO correspon- 3212 c609719bSwdenkding setting in the environment; if the corresponding environment 3213 c609719bSwdenkvariable is set, this overrides the settings in the card; that means: 3214 c609719bSwdenk 3215 c609719bSwdenko If the SROM has a valid MAC address, and there is no address in the 3216 c609719bSwdenk environment, the SROM's address is used. 3217 c609719bSwdenk 3218 c609719bSwdenko If there is no valid address in the SROM, and a definition in the 3219 c609719bSwdenk environment exists, then the value from the environment variable is 3220 c609719bSwdenk used. 3221 c609719bSwdenk 3222 c609719bSwdenko If both the SROM and the environment contain a MAC address, and 3223 c609719bSwdenk both addresses are the same, this MAC address is used. 3224 c609719bSwdenk 3225 c609719bSwdenko If both the SROM and the environment contain a MAC address, and the 3226 c609719bSwdenk addresses differ, the value from the environment is used and a 3227 c609719bSwdenk warning is printed. 3228 c609719bSwdenk 3229 c609719bSwdenko If neither SROM nor the environment contain a MAC address, an error 3230 c609719bSwdenk is raised. 3231 c609719bSwdenk 3232 c609719bSwdenk 3233 c609719bSwdenkImage Formats: 3234 c609719bSwdenk============== 3235 c609719bSwdenk 3236 3310c549SMarian BalakowiczU-Boot is capable of booting (and performing other auxiliary operations on) 3237 3310c549SMarian Balakowiczimages in two formats: 3238 3310c549SMarian Balakowicz 3239 3310c549SMarian BalakowiczNew uImage format (FIT) 3240 3310c549SMarian Balakowicz----------------------- 3241 3310c549SMarian Balakowicz 3242 3310c549SMarian BalakowiczFlexible and powerful format based on Flattened Image Tree -- FIT (similar 3243 3310c549SMarian Balakowiczto Flattened Device Tree). It allows the use of images with multiple 3244 3310c549SMarian Balakowiczcomponents (several kernels, ramdisks, etc.), with contents protected by 3245 3310c549SMarian BalakowiczSHA1, MD5 or CRC32. More details are found in the doc/uImage.FIT directory. 3246 3310c549SMarian Balakowicz 3247 3310c549SMarian Balakowicz 3248 3310c549SMarian BalakowiczOld uImage format 3249 3310c549SMarian Balakowicz----------------- 3250 3310c549SMarian Balakowicz 3251 3310c549SMarian BalakowiczOld image format is based on binary files which can be basically anything, 3252 3310c549SMarian Balakowiczpreceded by a special header; see the definitions in include/image.h for 3253 3310c549SMarian Balakowiczdetails; basically, the header defines the following image properties: 3254 c609719bSwdenk 3255 c609719bSwdenk* Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD, 3256 c609719bSwdenk 4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks, 3257 f5ed9e39SPeter Tyser LynxOS, pSOS, QNX, RTEMS, INTEGRITY; 3258 f5ed9e39SPeter Tyser Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, LynxOS, 3259 f5ed9e39SPeter Tyser INTEGRITY). 3260 7b64fef3SWolfgang Denk* Target CPU Architecture (Provisions for Alpha, ARM, AVR32, Intel x86, 3261 3d1e8a9dSwdenk IA64, MIPS, NIOS, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit; 3262 7b64fef3SWolfgang Denk Currently supported: ARM, AVR32, Intel x86, MIPS, NIOS, PowerPC). 3263 c29fdfc1Swdenk* Compression Type (uncompressed, gzip, bzip2) 3264 c609719bSwdenk* Load Address 3265 c609719bSwdenk* Entry Point 3266 c609719bSwdenk* Image Name 3267 c609719bSwdenk* Image Timestamp 3268 c609719bSwdenk 3269 c609719bSwdenkThe header is marked by a special Magic Number, and both the header 3270 c609719bSwdenkand the data portions of the image are secured against corruption by 3271 c609719bSwdenkCRC32 checksums. 3272 c609719bSwdenk 3273 c609719bSwdenk 3274 c609719bSwdenkLinux Support: 3275 c609719bSwdenk============== 3276 c609719bSwdenk 3277 c609719bSwdenkAlthough U-Boot should support any OS or standalone application 3278 7152b1d0Swdenkeasily, the main focus has always been on Linux during the design of 3279 c609719bSwdenkU-Boot. 3280 c609719bSwdenk 3281 c609719bSwdenkU-Boot includes many features that so far have been part of some 3282 c609719bSwdenkspecial "boot loader" code within the Linux kernel. Also, any 3283 c609719bSwdenk"initrd" images to be used are no longer part of one big Linux image; 3284 c609719bSwdenkinstead, kernel and "initrd" are separate images. This implementation 3285 7152b1d0Swdenkserves several purposes: 3286 c609719bSwdenk 3287 c609719bSwdenk- the same features can be used for other OS or standalone 3288 c609719bSwdenk applications (for instance: using compressed images to reduce the 3289 c609719bSwdenk Flash memory footprint) 3290 c609719bSwdenk 3291 c609719bSwdenk- it becomes much easier to port new Linux kernel versions because 3292 7152b1d0Swdenk lots of low-level, hardware dependent stuff are done by U-Boot 3293 c609719bSwdenk 3294 c609719bSwdenk- the same Linux kernel image can now be used with different "initrd" 3295 c609719bSwdenk images; of course this also means that different kernel images can 3296 c609719bSwdenk be run with the same "initrd". This makes testing easier (you don't 3297 c609719bSwdenk have to build a new "zImage.initrd" Linux image when you just 3298 c609719bSwdenk change a file in your "initrd"). Also, a field-upgrade of the 3299 c609719bSwdenk software is easier now. 3300 c609719bSwdenk 3301 c609719bSwdenk 3302 c609719bSwdenkLinux HOWTO: 3303 c609719bSwdenk============ 3304 c609719bSwdenk 3305 c609719bSwdenkPorting Linux to U-Boot based systems: 3306 c609719bSwdenk--------------------------------------- 3307 c609719bSwdenk 3308 c609719bSwdenkU-Boot cannot save you from doing all the necessary modifications to 3309 c609719bSwdenkconfigure the Linux device drivers for use with your target hardware 3310 c609719bSwdenk(no, we don't intend to provide a full virtual machine interface to 3311 c609719bSwdenkLinux :-). 3312 c609719bSwdenk 3313 c609719bSwdenkBut now you can ignore ALL boot loader code (in arch/ppc/mbxboot). 3314 c609719bSwdenk 3315 c609719bSwdenkJust make sure your machine specific header file (for instance 3316 c609719bSwdenkinclude/asm-ppc/tqm8xx.h) includes the same definition of the Board 3317 1dc30693SMarkus HeidelbergInformation structure as we define in include/asm-<arch>/u-boot.h, 3318 1dc30693SMarkus Heidelbergand make sure that your definition of IMAP_ADDR uses the same value 3319 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARDas your U-Boot configuration in CONFIG_SYS_IMMR. 3320 c609719bSwdenk 3321 c609719bSwdenk 3322 c609719bSwdenkConfiguring the Linux kernel: 3323 c609719bSwdenk----------------------------- 3324 c609719bSwdenk 3325 c609719bSwdenkNo specific requirements for U-Boot. Make sure you have some root 3326 c609719bSwdenkdevice (initial ramdisk, NFS) for your target system. 3327 c609719bSwdenk 3328 c609719bSwdenk 3329 c609719bSwdenkBuilding a Linux Image: 3330 c609719bSwdenk----------------------- 3331 c609719bSwdenk 3332 24ee89b9SwdenkWith U-Boot, "normal" build targets like "zImage" or "bzImage" are 3333 24ee89b9Swdenknot used. If you use recent kernel source, a new build target 3334 24ee89b9Swdenk"uImage" will exist which automatically builds an image usable by 3335 24ee89b9SwdenkU-Boot. Most older kernels also have support for a "pImage" target, 3336 24ee89b9Swdenkwhich was introduced for our predecessor project PPCBoot and uses a 3337 24ee89b9Swdenk100% compatible format. 3338 c609719bSwdenk 3339 c609719bSwdenkExample: 3340 c609719bSwdenk 3341 c609719bSwdenk make TQM850L_config 3342 c609719bSwdenk make oldconfig 3343 c609719bSwdenk make dep 3344 24ee89b9Swdenk make uImage 3345 c609719bSwdenk 3346 24ee89b9SwdenkThe "uImage" build target uses a special tool (in 'tools/mkimage') to 3347 24ee89b9Swdenkencapsulate a compressed Linux kernel image with header information, 3348 24ee89b9SwdenkCRC32 checksum etc. for use with U-Boot. This is what we are doing: 3349 c609719bSwdenk 3350 24ee89b9Swdenk* build a standard "vmlinux" kernel image (in ELF binary format): 3351 24ee89b9Swdenk 3352 24ee89b9Swdenk* convert the kernel into a raw binary image: 3353 24ee89b9Swdenk 3354 24ee89b9Swdenk ${CROSS_COMPILE}-objcopy -O binary \ 3355 24ee89b9Swdenk -R .note -R .comment \ 3356 24ee89b9Swdenk -S vmlinux linux.bin 3357 24ee89b9Swdenk 3358 24ee89b9Swdenk* compress the binary image: 3359 24ee89b9Swdenk 3360 24ee89b9Swdenk gzip -9 linux.bin 3361 24ee89b9Swdenk 3362 24ee89b9Swdenk* package compressed binary image for U-Boot: 3363 24ee89b9Swdenk 3364 24ee89b9Swdenk mkimage -A ppc -O linux -T kernel -C gzip \ 3365 24ee89b9Swdenk -a 0 -e 0 -n "Linux Kernel Image" \ 3366 24ee89b9Swdenk -d linux.bin.gz uImage 3367 24ee89b9Swdenk 3368 24ee89b9Swdenk 3369 24ee89b9SwdenkThe "mkimage" tool can also be used to create ramdisk images for use 3370 24ee89b9Swdenkwith U-Boot, either separated from the Linux kernel image, or 3371 24ee89b9Swdenkcombined into one file. "mkimage" encapsulates the images with a 64 3372 24ee89b9Swdenkbyte header containing information about target architecture, 3373 24ee89b9Swdenkoperating system, image type, compression method, entry points, time 3374 24ee89b9Swdenkstamp, CRC32 checksums, etc. 3375 24ee89b9Swdenk 3376 24ee89b9Swdenk"mkimage" can be called in two ways: to verify existing images and 3377 24ee89b9Swdenkprint the header information, or to build new images. 3378 c609719bSwdenk 3379 c609719bSwdenkIn the first form (with "-l" option) mkimage lists the information 3380 c609719bSwdenkcontained in the header of an existing U-Boot image; this includes 3381 c609719bSwdenkchecksum verification: 3382 c609719bSwdenk 3383 c609719bSwdenk tools/mkimage -l image 3384 c609719bSwdenk -l ==> list image header information 3385 c609719bSwdenk 3386 c609719bSwdenkThe second form (with "-d" option) is used to build a U-Boot image 3387 c609719bSwdenkfrom a "data file" which is used as image payload: 3388 c609719bSwdenk 3389 c609719bSwdenk tools/mkimage -A arch -O os -T type -C comp -a addr -e ep \ 3390 c609719bSwdenk -n name -d data_file image 3391 c609719bSwdenk -A ==> set architecture to 'arch' 3392 c609719bSwdenk -O ==> set operating system to 'os' 3393 c609719bSwdenk -T ==> set image type to 'type' 3394 c609719bSwdenk -C ==> set compression type 'comp' 3395 c609719bSwdenk -a ==> set load address to 'addr' (hex) 3396 c609719bSwdenk -e ==> set entry point to 'ep' (hex) 3397 c609719bSwdenk -n ==> set image name to 'name' 3398 c609719bSwdenk -d ==> use image data from 'datafile' 3399 c609719bSwdenk 3400 69459791SwdenkRight now, all Linux kernels for PowerPC systems use the same load 3401 69459791Swdenkaddress (0x00000000), but the entry point address depends on the 3402 69459791Swdenkkernel version: 3403 c609719bSwdenk 3404 c609719bSwdenk- 2.2.x kernels have the entry point at 0x0000000C, 3405 24ee89b9Swdenk- 2.3.x and later kernels have the entry point at 0x00000000. 3406 c609719bSwdenk 3407 c609719bSwdenkSo a typical call to build a U-Boot image would read: 3408 c609719bSwdenk 3409 24ee89b9Swdenk -> tools/mkimage -n '2.4.4 kernel for TQM850L' \ 3410 24ee89b9Swdenk > -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \ 3411 24ee89b9Swdenk > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/ppc/coffboot/vmlinux.gz \ 3412 24ee89b9Swdenk > examples/uImage.TQM850L 3413 24ee89b9Swdenk Image Name: 2.4.4 kernel for TQM850L 3414 c609719bSwdenk Created: Wed Jul 19 02:34:59 2000 3415 c609719bSwdenk Image Type: PowerPC Linux Kernel Image (gzip compressed) 3416 c609719bSwdenk Data Size: 335725 Bytes = 327.86 kB = 0.32 MB 3417 c609719bSwdenk Load Address: 0x00000000 3418 24ee89b9Swdenk Entry Point: 0x00000000 3419 c609719bSwdenk 3420 c609719bSwdenkTo verify the contents of the image (or check for corruption): 3421 c609719bSwdenk 3422 24ee89b9Swdenk -> tools/mkimage -l examples/uImage.TQM850L 3423 24ee89b9Swdenk Image Name: 2.4.4 kernel for TQM850L 3424 c609719bSwdenk Created: Wed Jul 19 02:34:59 2000 3425 c609719bSwdenk Image Type: PowerPC Linux Kernel Image (gzip compressed) 3426 c609719bSwdenk Data Size: 335725 Bytes = 327.86 kB = 0.32 MB 3427 c609719bSwdenk Load Address: 0x00000000 3428 24ee89b9Swdenk Entry Point: 0x00000000 3429 c609719bSwdenk 3430 c609719bSwdenkNOTE: for embedded systems where boot time is critical you can trade 3431 c609719bSwdenkspeed for memory and install an UNCOMPRESSED image instead: this 3432 c609719bSwdenkneeds more space in Flash, but boots much faster since it does not 3433 c609719bSwdenkneed to be uncompressed: 3434 c609719bSwdenk 3435 24ee89b9Swdenk -> gunzip /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/ppc/coffboot/vmlinux.gz 3436 24ee89b9Swdenk -> tools/mkimage -n '2.4.4 kernel for TQM850L' \ 3437 24ee89b9Swdenk > -A ppc -O linux -T kernel -C none -a 0 -e 0 \ 3438 24ee89b9Swdenk > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/ppc/coffboot/vmlinux \ 3439 24ee89b9Swdenk > examples/uImage.TQM850L-uncompressed 3440 24ee89b9Swdenk Image Name: 2.4.4 kernel for TQM850L 3441 c609719bSwdenk Created: Wed Jul 19 02:34:59 2000 3442 c609719bSwdenk Image Type: PowerPC Linux Kernel Image (uncompressed) 3443 c609719bSwdenk Data Size: 792160 Bytes = 773.59 kB = 0.76 MB 3444 c609719bSwdenk Load Address: 0x00000000 3445 24ee89b9Swdenk Entry Point: 0x00000000 3446 c609719bSwdenk 3447 c609719bSwdenk 3448 c609719bSwdenkSimilar you can build U-Boot images from a 'ramdisk.image.gz' file 3449 c609719bSwdenkwhen your kernel is intended to use an initial ramdisk: 3450 c609719bSwdenk 3451 c609719bSwdenk -> tools/mkimage -n 'Simple Ramdisk Image' \ 3452 c609719bSwdenk > -A ppc -O linux -T ramdisk -C gzip \ 3453 c609719bSwdenk > -d /LinuxPPC/images/SIMPLE-ramdisk.image.gz examples/simple-initrd 3454 c609719bSwdenk Image Name: Simple Ramdisk Image 3455 c609719bSwdenk Created: Wed Jan 12 14:01:50 2000 3456 c609719bSwdenk Image Type: PowerPC Linux RAMDisk Image (gzip compressed) 3457 c609719bSwdenk Data Size: 566530 Bytes = 553.25 kB = 0.54 MB 3458 c609719bSwdenk Load Address: 0x00000000 3459 c609719bSwdenk Entry Point: 0x00000000 3460 c609719bSwdenk 3461 c609719bSwdenk 3462 c609719bSwdenkInstalling a Linux Image: 3463 c609719bSwdenk------------------------- 3464 c609719bSwdenk 3465 c609719bSwdenkTo downloading a U-Boot image over the serial (console) interface, 3466 c609719bSwdenkyou must convert the image to S-Record format: 3467 c609719bSwdenk 3468 c609719bSwdenk objcopy -I binary -O srec examples/image examples/image.srec 3469 c609719bSwdenk 3470 c609719bSwdenkThe 'objcopy' does not understand the information in the U-Boot 3471 c609719bSwdenkimage header, so the resulting S-Record file will be relative to 3472 c609719bSwdenkaddress 0x00000000. To load it to a given address, you need to 3473 c609719bSwdenkspecify the target address as 'offset' parameter with the 'loads' 3474 c609719bSwdenkcommand. 3475 c609719bSwdenk 3476 c609719bSwdenkExample: install the image to address 0x40100000 (which on the 3477 c609719bSwdenkTQM8xxL is in the first Flash bank): 3478 c609719bSwdenk 3479 c609719bSwdenk => erase 40100000 401FFFFF 3480 c609719bSwdenk 3481 c609719bSwdenk .......... done 3482 c609719bSwdenk Erased 8 sectors 3483 c609719bSwdenk 3484 c609719bSwdenk => loads 40100000 3485 c609719bSwdenk ## Ready for S-Record download ... 3486 c609719bSwdenk ~>examples/image.srec 3487 c609719bSwdenk 1 2 3 4 5 6 7 8 9 10 11 12 13 ... 3488 c609719bSwdenk ... 3489 c609719bSwdenk 15989 15990 15991 15992 3490 c609719bSwdenk [file transfer complete] 3491 c609719bSwdenk [connected] 3492 c609719bSwdenk ## Start Addr = 0x00000000 3493 c609719bSwdenk 3494 c609719bSwdenk 3495 c609719bSwdenkYou can check the success of the download using the 'iminfo' command; 3496 c609719bSwdenkthis includes a checksum verification so you can be sure no data 3497 c609719bSwdenkcorruption happened: 3498 c609719bSwdenk 3499 c609719bSwdenk => imi 40100000 3500 c609719bSwdenk 3501 c609719bSwdenk ## Checking Image at 40100000 ... 3502 c609719bSwdenk Image Name: 2.2.13 for initrd on TQM850L 3503 c609719bSwdenk Image Type: PowerPC Linux Kernel Image (gzip compressed) 3504 c609719bSwdenk Data Size: 335725 Bytes = 327 kB = 0 MB 3505 c609719bSwdenk Load Address: 00000000 3506 c609719bSwdenk Entry Point: 0000000c 3507 c609719bSwdenk Verifying Checksum ... OK 3508 c609719bSwdenk 3509 c609719bSwdenk 3510 c609719bSwdenkBoot Linux: 3511 c609719bSwdenk----------- 3512 c609719bSwdenk 3513 c609719bSwdenkThe "bootm" command is used to boot an application that is stored in 3514 c609719bSwdenkmemory (RAM or Flash). In case of a Linux kernel image, the contents 3515 c609719bSwdenkof the "bootargs" environment variable is passed to the kernel as 3516 c609719bSwdenkparameters. You can check and modify this variable using the 3517 c609719bSwdenk"printenv" and "setenv" commands: 3518 c609719bSwdenk 3519 c609719bSwdenk 3520 c609719bSwdenk => printenv bootargs 3521 c609719bSwdenk bootargs=root=/dev/ram 3522 c609719bSwdenk 3523 c609719bSwdenk => setenv bootargs root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2 3524 c609719bSwdenk 3525 c609719bSwdenk => printenv bootargs 3526 c609719bSwdenk bootargs=root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2 3527 c609719bSwdenk 3528 c609719bSwdenk => bootm 40020000 3529 c609719bSwdenk ## Booting Linux kernel at 40020000 ... 3530 c609719bSwdenk Image Name: 2.2.13 for NFS on TQM850L 3531 c609719bSwdenk Image Type: PowerPC Linux Kernel Image (gzip compressed) 3532 c609719bSwdenk Data Size: 381681 Bytes = 372 kB = 0 MB 3533 c609719bSwdenk Load Address: 00000000 3534 c609719bSwdenk Entry Point: 0000000c 3535 c609719bSwdenk Verifying Checksum ... OK 3536 c609719bSwdenk Uncompressing Kernel Image ... OK 3537 c609719bSwdenk 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 3538 c609719bSwdenk Boot arguments: root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2 3539 c609719bSwdenk time_init: decrementer frequency = 187500000/60 3540 c609719bSwdenk Calibrating delay loop... 49.77 BogoMIPS 3541 c609719bSwdenk Memory: 15208k available (700k kernel code, 444k data, 32k init) [c0000000,c1000000] 3542 c609719bSwdenk ... 3543 c609719bSwdenk 3544 11ccc33fSMarcel ZiswilerIf you want to boot a Linux kernel with initial RAM disk, you pass 3545 7152b1d0Swdenkthe memory addresses of both the kernel and the initrd image (PPBCOOT 3546 c609719bSwdenkformat!) to the "bootm" command: 3547 c609719bSwdenk 3548 c609719bSwdenk => imi 40100000 40200000 3549 c609719bSwdenk 3550 c609719bSwdenk ## Checking Image at 40100000 ... 3551 c609719bSwdenk Image Name: 2.2.13 for initrd on TQM850L 3552 c609719bSwdenk Image Type: PowerPC Linux Kernel Image (gzip compressed) 3553 c609719bSwdenk Data Size: 335725 Bytes = 327 kB = 0 MB 3554 c609719bSwdenk Load Address: 00000000 3555 c609719bSwdenk Entry Point: 0000000c 3556 c609719bSwdenk Verifying Checksum ... OK 3557 c609719bSwdenk 3558 c609719bSwdenk ## Checking Image at 40200000 ... 3559 c609719bSwdenk Image Name: Simple Ramdisk Image 3560 c609719bSwdenk Image Type: PowerPC Linux RAMDisk Image (gzip compressed) 3561 c609719bSwdenk Data Size: 566530 Bytes = 553 kB = 0 MB 3562 c609719bSwdenk Load Address: 00000000 3563 c609719bSwdenk Entry Point: 00000000 3564 c609719bSwdenk Verifying Checksum ... OK 3565 c609719bSwdenk 3566 c609719bSwdenk => bootm 40100000 40200000 3567 c609719bSwdenk ## Booting Linux kernel at 40100000 ... 3568 c609719bSwdenk Image Name: 2.2.13 for initrd on TQM850L 3569 c609719bSwdenk Image Type: PowerPC Linux Kernel Image (gzip compressed) 3570 c609719bSwdenk Data Size: 335725 Bytes = 327 kB = 0 MB 3571 c609719bSwdenk Load Address: 00000000 3572 c609719bSwdenk Entry Point: 0000000c 3573 c609719bSwdenk Verifying Checksum ... OK 3574 c609719bSwdenk Uncompressing Kernel Image ... OK 3575 c609719bSwdenk ## Loading RAMDisk Image at 40200000 ... 3576 c609719bSwdenk Image Name: Simple Ramdisk Image 3577 c609719bSwdenk Image Type: PowerPC Linux RAMDisk Image (gzip compressed) 3578 c609719bSwdenk Data Size: 566530 Bytes = 553 kB = 0 MB 3579 c609719bSwdenk Load Address: 00000000 3580 c609719bSwdenk Entry Point: 00000000 3581 c609719bSwdenk Verifying Checksum ... OK 3582 c609719bSwdenk Loading Ramdisk ... OK 3583 c609719bSwdenk 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 3584 c609719bSwdenk Boot arguments: root=/dev/ram 3585 c609719bSwdenk time_init: decrementer frequency = 187500000/60 3586 c609719bSwdenk Calibrating delay loop... 49.77 BogoMIPS 3587 c609719bSwdenk ... 3588 c609719bSwdenk RAMDISK: Compressed image found at block 0 3589 c609719bSwdenk VFS: Mounted root (ext2 filesystem). 3590 c609719bSwdenk 3591 c609719bSwdenk bash# 3592 c609719bSwdenk 3593 0267768eSMatthew McClintockBoot Linux and pass a flat device tree: 3594 0267768eSMatthew McClintock----------- 3595 0267768eSMatthew McClintock 3596 0267768eSMatthew McClintockFirst, U-Boot must be compiled with the appropriate defines. See the section 3597 0267768eSMatthew McClintocktitled "Linux Kernel Interface" above for a more in depth explanation. The 3598 0267768eSMatthew McClintockfollowing is an example of how to start a kernel and pass an updated 3599 0267768eSMatthew McClintockflat device tree: 3600 0267768eSMatthew McClintock 3601 0267768eSMatthew McClintock=> print oftaddr 3602 0267768eSMatthew McClintockoftaddr=0x300000 3603 0267768eSMatthew McClintock=> print oft 3604 0267768eSMatthew McClintockoft=oftrees/mpc8540ads.dtb 3605 0267768eSMatthew McClintock=> tftp $oftaddr $oft 3606 0267768eSMatthew McClintockSpeed: 1000, full duplex 3607 0267768eSMatthew McClintockUsing TSEC0 device 3608 0267768eSMatthew McClintockTFTP from server 192.168.1.1; our IP address is 192.168.1.101 3609 0267768eSMatthew McClintockFilename 'oftrees/mpc8540ads.dtb'. 3610 0267768eSMatthew McClintockLoad address: 0x300000 3611 0267768eSMatthew McClintockLoading: # 3612 0267768eSMatthew McClintockdone 3613 0267768eSMatthew McClintockBytes transferred = 4106 (100a hex) 3614 0267768eSMatthew McClintock=> tftp $loadaddr $bootfile 3615 0267768eSMatthew McClintockSpeed: 1000, full duplex 3616 0267768eSMatthew McClintockUsing TSEC0 device 3617 0267768eSMatthew McClintockTFTP from server 192.168.1.1; our IP address is 192.168.1.2 3618 0267768eSMatthew McClintockFilename 'uImage'. 3619 0267768eSMatthew McClintockLoad address: 0x200000 3620 0267768eSMatthew McClintockLoading:############ 3621 0267768eSMatthew McClintockdone 3622 0267768eSMatthew McClintockBytes transferred = 1029407 (fb51f hex) 3623 0267768eSMatthew McClintock=> print loadaddr 3624 0267768eSMatthew McClintockloadaddr=200000 3625 0267768eSMatthew McClintock=> print oftaddr 3626 0267768eSMatthew McClintockoftaddr=0x300000 3627 0267768eSMatthew McClintock=> bootm $loadaddr - $oftaddr 3628 0267768eSMatthew McClintock## Booting image at 00200000 ... 3629 0267768eSMatthew McClintock Image Name: Linux-2.6.17-dirty 3630 0267768eSMatthew McClintock Image Type: PowerPC Linux Kernel Image (gzip compressed) 3631 0267768eSMatthew McClintock Data Size: 1029343 Bytes = 1005.2 kB 3632 0267768eSMatthew McClintock Load Address: 00000000 3633 0267768eSMatthew McClintock Entry Point: 00000000 3634 0267768eSMatthew McClintock Verifying Checksum ... OK 3635 0267768eSMatthew McClintock Uncompressing Kernel Image ... OK 3636 0267768eSMatthew McClintockBooting using flat device tree at 0x300000 3637 0267768eSMatthew McClintockUsing MPC85xx ADS machine description 3638 0267768eSMatthew McClintockMemory CAM mapping: CAM0=256Mb, CAM1=256Mb, CAM2=0Mb residual: 0Mb 3639 0267768eSMatthew McClintock[snip] 3640 0267768eSMatthew McClintock 3641 0267768eSMatthew McClintock 3642 6069ff26SwdenkMore About U-Boot Image Types: 3643 6069ff26Swdenk------------------------------ 3644 6069ff26Swdenk 3645 6069ff26SwdenkU-Boot supports the following image types: 3646 6069ff26Swdenk 3647 6069ff26Swdenk "Standalone Programs" are directly runnable in the environment 3648 6069ff26Swdenk provided by U-Boot; it is expected that (if they behave 3649 6069ff26Swdenk well) you can continue to work in U-Boot after return from 3650 6069ff26Swdenk the Standalone Program. 3651 6069ff26Swdenk "OS Kernel Images" are usually images of some Embedded OS which 3652 6069ff26Swdenk will take over control completely. Usually these programs 3653 6069ff26Swdenk will install their own set of exception handlers, device 3654 6069ff26Swdenk drivers, set up the MMU, etc. - this means, that you cannot 3655 6069ff26Swdenk expect to re-enter U-Boot except by resetting the CPU. 3656 6069ff26Swdenk "RAMDisk Images" are more or less just data blocks, and their 3657 6069ff26Swdenk parameters (address, size) are passed to an OS kernel that is 3658 6069ff26Swdenk being started. 3659 6069ff26Swdenk "Multi-File Images" contain several images, typically an OS 3660 6069ff26Swdenk (Linux) kernel image and one or more data images like 3661 6069ff26Swdenk RAMDisks. This construct is useful for instance when you want 3662 6069ff26Swdenk to boot over the network using BOOTP etc., where the boot 3663 6069ff26Swdenk server provides just a single image file, but you want to get 3664 6069ff26Swdenk for instance an OS kernel and a RAMDisk image. 3665 6069ff26Swdenk 3666 6069ff26Swdenk "Multi-File Images" start with a list of image sizes, each 3667 6069ff26Swdenk image size (in bytes) specified by an "uint32_t" in network 3668 6069ff26Swdenk byte order. This list is terminated by an "(uint32_t)0". 3669 6069ff26Swdenk Immediately after the terminating 0 follow the images, one by 3670 6069ff26Swdenk one, all aligned on "uint32_t" boundaries (size rounded up to 3671 6069ff26Swdenk a multiple of 4 bytes). 3672 6069ff26Swdenk 3673 6069ff26Swdenk "Firmware Images" are binary images containing firmware (like 3674 6069ff26Swdenk U-Boot or FPGA images) which usually will be programmed to 3675 6069ff26Swdenk flash memory. 3676 6069ff26Swdenk 3677 6069ff26Swdenk "Script files" are command sequences that will be executed by 3678 6069ff26Swdenk U-Boot's command interpreter; this feature is especially 3679 6069ff26Swdenk useful when you configure U-Boot to use a real shell (hush) 3680 6069ff26Swdenk as command interpreter. 3681 6069ff26Swdenk 3682 c609719bSwdenk 3683 c609719bSwdenkStandalone HOWTO: 3684 c609719bSwdenk================= 3685 c609719bSwdenk 3686 c609719bSwdenkOne of the features of U-Boot is that you can dynamically load and 3687 c609719bSwdenkrun "standalone" applications, which can use some resources of 3688 c609719bSwdenkU-Boot like console I/O functions or interrupt services. 3689 c609719bSwdenk 3690 c609719bSwdenkTwo simple examples are included with the sources: 3691 c609719bSwdenk 3692 c609719bSwdenk"Hello World" Demo: 3693 c609719bSwdenk------------------- 3694 c609719bSwdenk 3695 c609719bSwdenk'examples/hello_world.c' contains a small "Hello World" Demo 3696 c609719bSwdenkapplication; it is automatically compiled when you build U-Boot. 3697 c609719bSwdenkIt's configured to run at address 0x00040004, so you can play with it 3698 c609719bSwdenklike that: 3699 c609719bSwdenk 3700 c609719bSwdenk => loads 3701 c609719bSwdenk ## Ready for S-Record download ... 3702 c609719bSwdenk ~>examples/hello_world.srec 3703 c609719bSwdenk 1 2 3 4 5 6 7 8 9 10 11 ... 3704 c609719bSwdenk [file transfer complete] 3705 c609719bSwdenk [connected] 3706 c609719bSwdenk ## Start Addr = 0x00040004 3707 c609719bSwdenk 3708 c609719bSwdenk => go 40004 Hello World! This is a test. 3709 c609719bSwdenk ## Starting application at 0x00040004 ... 3710 c609719bSwdenk Hello World 3711 c609719bSwdenk argc = 7 3712 c609719bSwdenk argv[0] = "40004" 3713 c609719bSwdenk argv[1] = "Hello" 3714 c609719bSwdenk argv[2] = "World!" 3715 c609719bSwdenk argv[3] = "This" 3716 c609719bSwdenk argv[4] = "is" 3717 c609719bSwdenk argv[5] = "a" 3718 c609719bSwdenk argv[6] = "test." 3719 c609719bSwdenk argv[7] = "<NULL>" 3720 c609719bSwdenk Hit any key to exit ... 3721 c609719bSwdenk 3722 c609719bSwdenk ## Application terminated, rc = 0x0 3723 c609719bSwdenk 3724 c609719bSwdenkAnother example, which demonstrates how to register a CPM interrupt 3725 c609719bSwdenkhandler with the U-Boot code, can be found in 'examples/timer.c'. 3726 c609719bSwdenkHere, a CPM timer is set up to generate an interrupt every second. 3727 c609719bSwdenkThe interrupt service routine is trivial, just printing a '.' 3728 c609719bSwdenkcharacter, but this is just a demo program. The application can be 3729 c609719bSwdenkcontrolled by the following keys: 3730 c609719bSwdenk 3731 c609719bSwdenk ? - print current values og the CPM Timer registers 3732 c609719bSwdenk b - enable interrupts and start timer 3733 c609719bSwdenk e - stop timer and disable interrupts 3734 c609719bSwdenk q - quit application 3735 c609719bSwdenk 3736 c609719bSwdenk => loads 3737 c609719bSwdenk ## Ready for S-Record download ... 3738 c609719bSwdenk ~>examples/timer.srec 3739 c609719bSwdenk 1 2 3 4 5 6 7 8 9 10 11 ... 3740 c609719bSwdenk [file transfer complete] 3741 c609719bSwdenk [connected] 3742 c609719bSwdenk ## Start Addr = 0x00040004 3743 c609719bSwdenk 3744 c609719bSwdenk => go 40004 3745 c609719bSwdenk ## Starting application at 0x00040004 ... 3746 c609719bSwdenk TIMERS=0xfff00980 3747 c609719bSwdenk Using timer 1 3748 c609719bSwdenk tgcr @ 0xfff00980, tmr @ 0xfff00990, trr @ 0xfff00994, tcr @ 0xfff00998, tcn @ 0xfff0099c, ter @ 0xfff009b0 3749 c609719bSwdenk 3750 c609719bSwdenkHit 'b': 3751 c609719bSwdenk [q, b, e, ?] Set interval 1000000 us 3752 c609719bSwdenk Enabling timer 3753 c609719bSwdenkHit '?': 3754 c609719bSwdenk [q, b, e, ?] ........ 3755 c609719bSwdenk tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0xef6, ter=0x0 3756 c609719bSwdenkHit '?': 3757 c609719bSwdenk [q, b, e, ?] . 3758 c609719bSwdenk tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x2ad4, ter=0x0 3759 c609719bSwdenkHit '?': 3760 c609719bSwdenk [q, b, e, ?] . 3761 c609719bSwdenk tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x1efc, ter=0x0 3762 c609719bSwdenkHit '?': 3763 c609719bSwdenk [q, b, e, ?] . 3764 c609719bSwdenk tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x169d, ter=0x0 3765 c609719bSwdenkHit 'e': 3766 c609719bSwdenk [q, b, e, ?] ...Stopping timer 3767 c609719bSwdenkHit 'q': 3768 c609719bSwdenk [q, b, e, ?] ## Application terminated, rc = 0x0 3769 c609719bSwdenk 3770 c609719bSwdenk 3771 85ec0bccSwdenkMinicom warning: 3772 85ec0bccSwdenk================ 3773 85ec0bccSwdenk 3774 7152b1d0SwdenkOver time, many people have reported problems when trying to use the 3775 85ec0bccSwdenk"minicom" terminal emulation program for serial download. I (wd) 3776 85ec0bccSwdenkconsider minicom to be broken, and recommend not to use it. Under 3777 f07771ccSwdenkUnix, I recommend to use C-Kermit for general purpose use (and 3778 85ec0bccSwdenkespecially for kermit binary protocol download ("loadb" command), and 3779 85ec0bccSwdenkuse "cu" for S-Record download ("loads" command). 3780 85ec0bccSwdenk 3781 52f52c14SwdenkNevertheless, if you absolutely want to use it try adding this 3782 52f52c14Swdenkconfiguration to your "File transfer protocols" section: 3783 52f52c14Swdenk 3784 52f52c14Swdenk Name Program Name U/D FullScr IO-Red. Multi 3785 52f52c14Swdenk X kermit /usr/bin/kermit -i -l %l -s Y U Y N N 3786 52f52c14Swdenk Y kermit /usr/bin/kermit -i -l %l -r N D Y N N 3787 52f52c14Swdenk 3788 52f52c14Swdenk 3789 c609719bSwdenkNetBSD Notes: 3790 c609719bSwdenk============= 3791 c609719bSwdenk 3792 c609719bSwdenkStarting at version 0.9.2, U-Boot supports NetBSD both as host 3793 c609719bSwdenk(build U-Boot) and target system (boots NetBSD/mpc8xx). 3794 c609719bSwdenk 3795 c609719bSwdenkBuilding requires a cross environment; it is known to work on 3796 c609719bSwdenkNetBSD/i386 with the cross-powerpc-netbsd-1.3 package (you will also 3797 c609719bSwdenkneed gmake since the Makefiles are not compatible with BSD make). 3798 c609719bSwdenkNote that the cross-powerpc package does not install include files; 3799 c609719bSwdenkattempting to build U-Boot will fail because <machine/ansi.h> is 3800 c609719bSwdenkmissing. This file has to be installed and patched manually: 3801 c609719bSwdenk 3802 c609719bSwdenk # cd /usr/pkg/cross/powerpc-netbsd/include 3803 c609719bSwdenk # mkdir powerpc 3804 c609719bSwdenk # ln -s powerpc machine 3805 c609719bSwdenk # cp /usr/src/sys/arch/powerpc/include/ansi.h powerpc/ansi.h 3806 c609719bSwdenk # ${EDIT} powerpc/ansi.h ## must remove __va_list, _BSD_VA_LIST 3807 c609719bSwdenk 3808 c609719bSwdenkNative builds *don't* work due to incompatibilities between native 3809 c609719bSwdenkand U-Boot include files. 3810 c609719bSwdenk 3811 c609719bSwdenkBooting assumes that (the first part of) the image booted is a 3812 c609719bSwdenkstage-2 loader which in turn loads and then invokes the kernel 3813 c609719bSwdenkproper. Loader sources will eventually appear in the NetBSD source 3814 c609719bSwdenktree (probably in sys/arc/mpc8xx/stand/u-boot_stage2/); in the 3815 2a8af187Swdenkmeantime, see ftp://ftp.denx.de/pub/u-boot/ppcboot_stage2.tar.gz 3816 c609719bSwdenk 3817 c609719bSwdenk 3818 c609719bSwdenkImplementation Internals: 3819 c609719bSwdenk========================= 3820 c609719bSwdenk 3821 c609719bSwdenkThe following is not intended to be a complete description of every 3822 c609719bSwdenkimplementation detail. However, it should help to understand the 3823 c609719bSwdenkinner workings of U-Boot and make it easier to port it to custom 3824 c609719bSwdenkhardware. 3825 c609719bSwdenk 3826 c609719bSwdenk 3827 c609719bSwdenkInitial Stack, Global Data: 3828 c609719bSwdenk--------------------------- 3829 c609719bSwdenk 3830 c609719bSwdenkThe implementation of U-Boot is complicated by the fact that U-Boot 3831 c609719bSwdenkstarts running out of ROM (flash memory), usually without access to 3832 c609719bSwdenksystem RAM (because the memory controller is not initialized yet). 3833 c609719bSwdenkThis means that we don't have writable Data or BSS segments, and BSS 3834 c609719bSwdenkis not initialized as zero. To be able to get a C environment working 3835 c609719bSwdenkat all, we have to allocate at least a minimal stack. Implementation 3836 c609719bSwdenkoptions for this are defined and restricted by the CPU used: Some CPU 3837 c609719bSwdenkmodels provide on-chip memory (like the IMMR area on MPC8xx and 3838 c609719bSwdenkMPC826x processors), on others (parts of) the data cache can be 3839 c609719bSwdenklocked as (mis-) used as memory, etc. 3840 c609719bSwdenk 3841 7152b1d0Swdenk Chris Hallinan posted a good summary of these issues to the 3842 0668236bSWolfgang Denk U-Boot mailing list: 3843 43d9616cSwdenk 3844 43d9616cSwdenk Subject: RE: [U-Boot-Users] RE: More On Memory Bank x (nothingness)? 3845 43d9616cSwdenk From: "Chris Hallinan" <clh@net1plus.com> 3846 43d9616cSwdenk Date: Mon, 10 Feb 2003 16:43:46 -0500 (22:43 MET) 3847 43d9616cSwdenk ... 3848 43d9616cSwdenk 3849 43d9616cSwdenk Correct me if I'm wrong, folks, but the way I understand it 3850 43d9616cSwdenk is this: Using DCACHE as initial RAM for Stack, etc, does not 3851 43d9616cSwdenk require any physical RAM backing up the cache. The cleverness 3852 43d9616cSwdenk is that the cache is being used as a temporary supply of 3853 43d9616cSwdenk necessary storage before the SDRAM controller is setup. It's 3854 11ccc33fSMarcel Ziswiler beyond the scope of this list to explain the details, but you 3855 43d9616cSwdenk can see how this works by studying the cache architecture and 3856 43d9616cSwdenk operation in the architecture and processor-specific manuals. 3857 43d9616cSwdenk 3858 43d9616cSwdenk OCM is On Chip Memory, which I believe the 405GP has 4K. It 3859 43d9616cSwdenk is another option for the system designer to use as an 3860 11ccc33fSMarcel Ziswiler initial stack/RAM area prior to SDRAM being available. Either 3861 43d9616cSwdenk option should work for you. Using CS 4 should be fine if your 3862 43d9616cSwdenk board designers haven't used it for something that would 3863 43d9616cSwdenk cause you grief during the initial boot! It is frequently not 3864 43d9616cSwdenk used. 3865 43d9616cSwdenk 3866 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_INIT_RAM_ADDR should be somewhere that won't interfere 3867 43d9616cSwdenk with your processor/board/system design. The default value 3868 43d9616cSwdenk you will find in any recent u-boot distribution in 3869 8a316c9bSStefan Roese walnut.h should work for you. I'd set it to a value larger 3870 43d9616cSwdenk than your SDRAM module. If you have a 64MB SDRAM module, set 3871 43d9616cSwdenk it above 400_0000. Just make sure your board has no resources 3872 43d9616cSwdenk that are supposed to respond to that address! That code in 3873 43d9616cSwdenk start.S has been around a while and should work as is when 3874 43d9616cSwdenk you get the config right. 3875 43d9616cSwdenk 3876 43d9616cSwdenk -Chris Hallinan 3877 43d9616cSwdenk DS4.COM, Inc. 3878 43d9616cSwdenk 3879 c609719bSwdenkIt is essential to remember this, since it has some impact on the C 3880 c609719bSwdenkcode for the initialization procedures: 3881 c609719bSwdenk 3882 c609719bSwdenk* Initialized global data (data segment) is read-only. Do not attempt 3883 c609719bSwdenk to write it. 3884 c609719bSwdenk 3885 11ccc33fSMarcel Ziswiler* Do not use any uninitialized global data (or implicitely initialized 3886 c609719bSwdenk as zero data - BSS segment) at all - this is undefined, initiali- 3887 7152b1d0Swdenk zation is performed later (when relocating to RAM). 3888 c609719bSwdenk 3889 c609719bSwdenk* Stack space is very limited. Avoid big data buffers or things like 3890 c609719bSwdenk that. 3891 c609719bSwdenk 3892 c609719bSwdenkHaving only the stack as writable memory limits means we cannot use 3893 c609719bSwdenknormal global data to share information beween the code. But it 3894 c609719bSwdenkturned out that the implementation of U-Boot can be greatly 3895 c609719bSwdenksimplified by making a global data structure (gd_t) available to all 3896 c609719bSwdenkfunctions. We could pass a pointer to this data as argument to _all_ 3897 c609719bSwdenkfunctions, but this would bloat the code. Instead we use a feature of 3898 c609719bSwdenkthe GCC compiler (Global Register Variables) to share the data: we 3899 c609719bSwdenkplace a pointer (gd) to the global data into a register which we 3900 c609719bSwdenkreserve for this purpose. 3901 c609719bSwdenk 3902 7152b1d0SwdenkWhen choosing a register for such a purpose we are restricted by the 3903 c609719bSwdenkrelevant (E)ABI specifications for the current architecture, and by 3904 c609719bSwdenkGCC's implementation. 3905 c609719bSwdenk 3906 c609719bSwdenkFor PowerPC, the following registers have specific use: 3907 c609719bSwdenk R1: stack pointer 3908 e7670f6cSWolfgang Denk R2: reserved for system use 3909 c609719bSwdenk R3-R4: parameter passing and return values 3910 c609719bSwdenk R5-R10: parameter passing 3911 c609719bSwdenk R13: small data area pointer 3912 c609719bSwdenk R30: GOT pointer 3913 c609719bSwdenk R31: frame pointer 3914 c609719bSwdenk 3915 c609719bSwdenk (U-Boot also uses R14 as internal GOT pointer.) 3916 c609719bSwdenk 3917 e7670f6cSWolfgang Denk ==> U-Boot will use R2 to hold a pointer to the global data 3918 c609719bSwdenk 3919 c609719bSwdenk Note: on PPC, we could use a static initializer (since the 3920 c609719bSwdenk address of the global data structure is known at compile time), 3921 c609719bSwdenk but it turned out that reserving a register results in somewhat 3922 c609719bSwdenk smaller code - although the code savings are not that big (on 3923 c609719bSwdenk average for all boards 752 bytes for the whole U-Boot image, 3924 c609719bSwdenk 624 text + 127 data). 3925 c609719bSwdenk 3926 c4db335cSRobin GetzOn Blackfin, the normal C ABI (except for P3) is followed as documented here: 3927 4c58eb55SMike Frysinger http://docs.blackfin.uclinux.org/doku.php?id=application_binary_interface 3928 4c58eb55SMike Frysinger 3929 c4db335cSRobin Getz ==> U-Boot will use P3 to hold a pointer to the global data 3930 4c58eb55SMike Frysinger 3931 c609719bSwdenkOn ARM, the following registers are used: 3932 c609719bSwdenk 3933 c609719bSwdenk R0: function argument word/integer result 3934 c609719bSwdenk R1-R3: function argument word 3935 c609719bSwdenk R9: GOT pointer 3936 c609719bSwdenk R10: stack limit (used only if stack checking if enabled) 3937 c609719bSwdenk R11: argument (frame) pointer 3938 c609719bSwdenk R12: temporary workspace 3939 c609719bSwdenk R13: stack pointer 3940 c609719bSwdenk R14: link register 3941 c609719bSwdenk R15: program counter 3942 c609719bSwdenk 3943 c609719bSwdenk ==> U-Boot will use R8 to hold a pointer to the global data 3944 c609719bSwdenk 3945 d87080b7SWolfgang DenkNOTE: DECLARE_GLOBAL_DATA_PTR must be used with file-global scope, 3946 d87080b7SWolfgang Denkor current versions of GCC may "optimize" the code too much. 3947 c609719bSwdenk 3948 c609719bSwdenkMemory Management: 3949 c609719bSwdenk------------------ 3950 c609719bSwdenk 3951 c609719bSwdenkU-Boot runs in system state and uses physical addresses, i.e. the 3952 c609719bSwdenkMMU is not used either for address mapping nor for memory protection. 3953 c609719bSwdenk 3954 c609719bSwdenkThe available memory is mapped to fixed addresses using the memory 3955 c609719bSwdenkcontroller. In this process, a contiguous block is formed for each 3956 c609719bSwdenkmemory type (Flash, SDRAM, SRAM), even when it consists of several 3957 c609719bSwdenkphysical memory banks. 3958 c609719bSwdenk 3959 c609719bSwdenkU-Boot is installed in the first 128 kB of the first Flash bank (on 3960 c609719bSwdenkTQM8xxL modules this is the range 0x40000000 ... 0x4001FFFF). After 3961 c609719bSwdenkbooting and sizing and initializing DRAM, the code relocates itself 3962 c609719bSwdenkto the upper end of DRAM. Immediately below the U-Boot code some 3963 6d0f6bcfSJean-Christophe PLAGNIOL-VILLARDmemory is reserved for use by malloc() [see CONFIG_SYS_MALLOC_LEN 3964 c609719bSwdenkconfiguration setting]. Below that, a structure with global Board 3965 c609719bSwdenkInfo data is placed, followed by the stack (growing downward). 3966 c609719bSwdenk 3967 c609719bSwdenkAdditionally, some exception handler code is copied to the low 8 kB 3968 c609719bSwdenkof DRAM (0x00000000 ... 0x00001FFF). 3969 c609719bSwdenk 3970 c609719bSwdenkSo a typical memory configuration with 16 MB of DRAM could look like 3971 c609719bSwdenkthis: 3972 c609719bSwdenk 3973 c609719bSwdenk 0x0000 0000 Exception Vector code 3974 c609719bSwdenk : 3975 c609719bSwdenk 0x0000 1FFF 3976 c609719bSwdenk 0x0000 2000 Free for Application Use 3977 c609719bSwdenk : 3978 c609719bSwdenk : 3979 c609719bSwdenk 3980 c609719bSwdenk : 3981 c609719bSwdenk : 3982 c609719bSwdenk 0x00FB FF20 Monitor Stack (Growing downward) 3983 c609719bSwdenk 0x00FB FFAC Board Info Data and permanent copy of global data 3984 c609719bSwdenk 0x00FC 0000 Malloc Arena 3985 c609719bSwdenk : 3986 c609719bSwdenk 0x00FD FFFF 3987 c609719bSwdenk 0x00FE 0000 RAM Copy of Monitor Code 3988 c609719bSwdenk ... eventually: LCD or video framebuffer 3989 c609719bSwdenk ... eventually: pRAM (Protected RAM - unchanged by reset) 3990 c609719bSwdenk 0x00FF FFFF [End of RAM] 3991 c609719bSwdenk 3992 c609719bSwdenk 3993 c609719bSwdenkSystem Initialization: 3994 c609719bSwdenk---------------------- 3995 c609719bSwdenk 3996 c609719bSwdenkIn the reset configuration, U-Boot starts at the reset entry point 3997 11ccc33fSMarcel Ziswiler(on most PowerPC systems at address 0x00000100). Because of the reset 3998 c609719bSwdenkconfiguration for CS0# this is a mirror of the onboard Flash memory. 3999 7152b1d0SwdenkTo be able to re-map memory U-Boot then jumps to its link address. 4000 c609719bSwdenkTo be able to implement the initialization code in C, a (small!) 4001 c609719bSwdenkinitial stack is set up in the internal Dual Ported RAM (in case CPUs 4002 c609719bSwdenkwhich provide such a feature like MPC8xx or MPC8260), or in a locked 4003 c609719bSwdenkpart of the data cache. After that, U-Boot initializes the CPU core, 4004 c609719bSwdenkthe caches and the SIU. 4005 c609719bSwdenk 4006 c609719bSwdenkNext, all (potentially) available memory banks are mapped using a 4007 c609719bSwdenkpreliminary mapping. For example, we put them on 512 MB boundaries 4008 c609719bSwdenk(multiples of 0x20000000: SDRAM on 0x00000000 and 0x20000000, Flash 4009 c609719bSwdenkon 0x40000000 and 0x60000000, SRAM on 0x80000000). Then UPM A is 4010 c609719bSwdenkprogrammed for SDRAM access. Using the temporary configuration, a 4011 c609719bSwdenksimple memory test is run that determines the size of the SDRAM 4012 c609719bSwdenkbanks. 4013 c609719bSwdenk 4014 c609719bSwdenkWhen there is more than one SDRAM bank, and the banks are of 4015 7152b1d0Swdenkdifferent size, the largest is mapped first. For equal size, the first 4016 c609719bSwdenkbank (CS2#) is mapped first. The first mapping is always for address 4017 c609719bSwdenk0x00000000, with any additional banks following immediately to create 4018 c609719bSwdenkcontiguous memory starting from 0. 4019 c609719bSwdenk 4020 c609719bSwdenkThen, the monitor installs itself at the upper end of the SDRAM area 4021 c609719bSwdenkand allocates memory for use by malloc() and for the global Board 4022 c609719bSwdenkInfo data; also, the exception vector code is copied to the low RAM 4023 c609719bSwdenkpages, and the final stack is set up. 4024 c609719bSwdenk 4025 c609719bSwdenkOnly after this relocation will you have a "normal" C environment; 4026 c609719bSwdenkuntil that you are restricted in several ways, mostly because you are 4027 c609719bSwdenkrunning from ROM, and because the code will have to be relocated to a 4028 c609719bSwdenknew address in RAM. 4029 c609719bSwdenk 4030 c609719bSwdenk 4031 c609719bSwdenkU-Boot Porting Guide: 4032 c609719bSwdenk---------------------- 4033 c609719bSwdenk 4034 c609719bSwdenk[Based on messages by Jerry Van Baren in the U-Boot-Users mailing 4035 6aff3115Swdenklist, October 2002] 4036 c609719bSwdenk 4037 c609719bSwdenk 4038 c609719bSwdenkint main(int argc, char *argv[]) 4039 c609719bSwdenk{ 4040 c609719bSwdenk sighandler_t no_more_time; 4041 c609719bSwdenk 4042 c609719bSwdenk signal(SIGALRM, no_more_time); 4043 c609719bSwdenk alarm(PROJECT_DEADLINE - toSec (3 * WEEK)); 4044 c609719bSwdenk 4045 c609719bSwdenk if (available_money > available_manpower) { 4046 6c3fef28SJerry Van Baren Pay consultant to port U-Boot; 4047 c609719bSwdenk return 0; 4048 c609719bSwdenk } 4049 c609719bSwdenk 4050 c609719bSwdenk Download latest U-Boot source; 4051 c609719bSwdenk 4052 0668236bSWolfgang Denk Subscribe to u-boot mailing list; 4053 6aff3115Swdenk 4054 6c3fef28SJerry Van Baren if (clueless) 4055 c609719bSwdenk email("Hi, I am new to U-Boot, how do I get started?"); 4056 c609719bSwdenk 4057 c609719bSwdenk while (learning) { 4058 c609719bSwdenk Read the README file in the top level directory; 4059 7cb22f97Swdenk Read http://www.denx.de/twiki/bin/view/DULG/Manual; 4060 6c3fef28SJerry Van Baren Read applicable doc/*.README; 4061 c609719bSwdenk Read the source, Luke; 4062 6c3fef28SJerry Van Baren /* find . -name "*.[chS]" | xargs grep -i <keyword> */ 4063 c609719bSwdenk } 4064 c609719bSwdenk 4065 6c3fef28SJerry Van Baren if (available_money > toLocalCurrency ($2500)) 4066 6c3fef28SJerry Van Baren Buy a BDI3000; 4067 6c3fef28SJerry Van Baren else 4068 c609719bSwdenk Add a lot of aggravation and time; 4069 c609719bSwdenk 4070 6c3fef28SJerry Van Baren if (a similar board exists) { /* hopefully... */ 4071 6c3fef28SJerry Van Baren cp -a board/<similar> board/<myboard> 4072 6c3fef28SJerry Van Baren cp include/configs/<similar>.h include/configs/<myboard>.h 4073 6c3fef28SJerry Van Baren } else { 4074 c609719bSwdenk Create your own board support subdirectory; 4075 6c3fef28SJerry Van Baren Create your own board include/configs/<myboard>.h file; 4076 6c3fef28SJerry Van Baren } 4077 6c3fef28SJerry Van Baren Edit new board/<myboard> files 4078 6c3fef28SJerry Van Baren Edit new include/configs/<myboard>.h 4079 c609719bSwdenk 4080 6c3fef28SJerry Van Baren while (!accepted) { 4081 c609719bSwdenk while (!running) { 4082 c609719bSwdenk do { 4083 c609719bSwdenk Add / modify source code; 4084 c609719bSwdenk } until (compiles); 4085 c609719bSwdenk Debug; 4086 c609719bSwdenk if (clueless) 4087 c609719bSwdenk email("Hi, I am having problems..."); 4088 c609719bSwdenk } 4089 6c3fef28SJerry Van Baren Send patch file to the U-Boot email list; 4090 6c3fef28SJerry Van Baren if (reasonable critiques) 4091 6c3fef28SJerry Van Baren Incorporate improvements from email list code review; 4092 6c3fef28SJerry Van Baren else 4093 6c3fef28SJerry Van Baren Defend code as written; 4094 6c3fef28SJerry Van Baren } 4095 c609719bSwdenk 4096 c609719bSwdenk return 0; 4097 c609719bSwdenk} 4098 c609719bSwdenk 4099 c609719bSwdenkvoid no_more_time (int sig) 4100 c609719bSwdenk{ 4101 c609719bSwdenk hire_a_guru(); 4102 c609719bSwdenk} 4103 c609719bSwdenk 4104 c609719bSwdenk 4105 c609719bSwdenkCoding Standards: 4106 c609719bSwdenk----------------- 4107 c609719bSwdenk 4108 c609719bSwdenkAll contributions to U-Boot should conform to the Linux kernel 4109 2c051651SDetlev Zundelcoding style; see the file "Documentation/CodingStyle" and the script 4110 2c051651SDetlev Zundel"scripts/Lindent" in your Linux kernel source directory. In sources 4111 2c051651SDetlev Zundeloriginating from U-Boot a style corresponding to "Lindent -pcs" (adding 4112 2c051651SDetlev Zundelspaces before parameters to function calls) is actually used. 4113 c609719bSwdenk 4114 2c051651SDetlev ZundelSource files originating from a different project (for example the 4115 2c051651SDetlev ZundelMTD subsystem) are generally exempt from these guidelines and are not 4116 2c051651SDetlev Zundelreformated to ease subsequent migration to newer versions of those 4117 2c051651SDetlev Zundelsources. 4118 2c051651SDetlev Zundel 4119 2c051651SDetlev ZundelPlease note that U-Boot is implemented in C (and to some small parts in 4120 2c051651SDetlev ZundelAssembler); no C++ is used, so please do not use C++ style comments (//) 4121 2c051651SDetlev Zundelin your code. 4122 c609719bSwdenk 4123 c178d3daSwdenkPlease also stick to the following formatting rules: 4124 180d3f74Swdenk- remove any trailing white space 4125 180d3f74Swdenk- use TAB characters for indentation, not spaces 4126 180d3f74Swdenk- make sure NOT to use DOS '\r\n' line feeds 4127 180d3f74Swdenk- do not add more than 2 empty lines to source files 4128 180d3f74Swdenk- do not add trailing empty lines to source files 4129 180d3f74Swdenk 4130 c609719bSwdenkSubmissions which do not conform to the standards may be returned 4131 c609719bSwdenkwith a request to reformat the changes. 4132 c609719bSwdenk 4133 c609719bSwdenk 4134 c609719bSwdenkSubmitting Patches: 4135 c609719bSwdenk------------------- 4136 c609719bSwdenk 4137 c609719bSwdenkSince the number of patches for U-Boot is growing, we need to 4138 c609719bSwdenkestablish some rules. Submissions which do not conform to these rules 4139 c609719bSwdenkmay be rejected, even when they contain important and valuable stuff. 4140 c609719bSwdenk 4141 0d28f34bSMagnus LiljaPlease see http://www.denx.de/wiki/U-Boot/Patches for details. 4142 218ca724SWolfgang Denk 4143 0668236bSWolfgang DenkPatches shall be sent to the u-boot mailing list <u-boot@lists.denx.de>; 4144 0668236bSWolfgang Denksee http://lists.denx.de/mailman/listinfo/u-boot 4145 0668236bSWolfgang Denk 4146 c609719bSwdenkWhen you send a patch, please include the following information with 4147 c609719bSwdenkit: 4148 c609719bSwdenk 4149 c609719bSwdenk* For bug fixes: a description of the bug and how your patch fixes 4150 c609719bSwdenk this bug. Please try to include a way of demonstrating that the 4151 c609719bSwdenk patch actually fixes something. 4152 c609719bSwdenk 4153 c609719bSwdenk* For new features: a description of the feature and your 4154 c609719bSwdenk implementation. 4155 c609719bSwdenk 4156 c609719bSwdenk* A CHANGELOG entry as plaintext (separate from the patch) 4157 c609719bSwdenk 4158 c609719bSwdenk* For major contributions, your entry to the CREDITS file 4159 c609719bSwdenk 4160 c609719bSwdenk* When you add support for a new board, don't forget to add this 4161 c609719bSwdenk board to the MAKEALL script, too. 4162 c609719bSwdenk 4163 c609719bSwdenk* If your patch adds new configuration options, don't forget to 4164 c609719bSwdenk document these in the README file. 4165 c609719bSwdenk 4166 218ca724SWolfgang Denk* The patch itself. If you are using git (which is *strongly* 4167 218ca724SWolfgang Denk recommended) you can easily generate the patch using the 4168 218ca724SWolfgang Denk "git-format-patch". If you then use "git-send-email" to send it to 4169 218ca724SWolfgang Denk the U-Boot mailing list, you will avoid most of the common problems 4170 218ca724SWolfgang Denk with some other mail clients. 4171 c609719bSwdenk 4172 218ca724SWolfgang Denk If you cannot use git, use "diff -purN OLD NEW". If your version of 4173 218ca724SWolfgang Denk diff does not support these options, then get the latest version of 4174 218ca724SWolfgang Denk GNU diff. 4175 6dff5529Swdenk 4176 218ca724SWolfgang Denk The current directory when running this command shall be the parent 4177 218ca724SWolfgang Denk directory of the U-Boot source tree (i. e. please make sure that 4178 218ca724SWolfgang Denk your patch includes sufficient directory information for the 4179 218ca724SWolfgang Denk affected files). 4180 218ca724SWolfgang Denk 4181 218ca724SWolfgang Denk We prefer patches as plain text. MIME attachments are discouraged, 4182 218ca724SWolfgang Denk and compressed attachments must not be used. 4183 c609719bSwdenk 4184 52f52c14Swdenk* If one logical set of modifications affects or creates several 4185 52f52c14Swdenk files, all these changes shall be submitted in a SINGLE patch file. 4186 52f52c14Swdenk 4187 52f52c14Swdenk* Changesets that contain different, unrelated modifications shall be 4188 52f52c14Swdenk submitted as SEPARATE patches, one patch per changeset. 4189 52f52c14Swdenk 4190 52f52c14Swdenk 4191 c609719bSwdenkNotes: 4192 c609719bSwdenk 4193 c609719bSwdenk* Before sending the patch, run the MAKEALL script on your patched 4194 c609719bSwdenk source tree and make sure that no errors or warnings are reported 4195 c609719bSwdenk for any of the boards. 4196 c609719bSwdenk 4197 c609719bSwdenk* Keep your modifications to the necessary minimum: A patch 4198 c609719bSwdenk containing several unrelated changes or arbitrary reformats will be 4199 c609719bSwdenk returned with a request to re-formatting / split it. 4200 c609719bSwdenk 4201 c609719bSwdenk* If you modify existing code, make sure that your new code does not 4202 c609719bSwdenk add to the memory footprint of the code ;-) Small is beautiful! 4203 c609719bSwdenk When adding new features, these should compile conditionally only 4204 c609719bSwdenk (using #ifdef), and the resulting code with the new feature 4205 c609719bSwdenk disabled must not need more memory than the old code without your 4206 c609719bSwdenk modification. 4207 90dc6704Swdenk 4208 0668236bSWolfgang Denk* Remember that there is a size limit of 100 kB per message on the 4209 0668236bSWolfgang Denk u-boot mailing list. Bigger patches will be moderated. If they are 4210 0668236bSWolfgang Denk reasonable and not too big, they will be acknowledged. But patches 4211 0668236bSWolfgang Denk bigger than the size limit should be avoided. 4212