1c609719bSwdenk# 2c609719bSwdenk# (C) Copyright 2000 - 2002 3c609719bSwdenk# Wolfgang Denk, DENX Software Engineering, wd@denx.de. 4c609719bSwdenk# 5c609719bSwdenk# See file CREDITS for list of people who contributed to this 6c609719bSwdenk# project. 7c609719bSwdenk# 8c609719bSwdenk# This program is free software; you can redistribute it and/or 9c609719bSwdenk# modify it under the terms of the GNU General Public License as 10c609719bSwdenk# published by the Free Software Foundation; either version 2 of 11c609719bSwdenk# the License, or (at your option) any later version. 12c609719bSwdenk# 13c609719bSwdenk# This program is distributed in the hope that it will be useful, 14c609719bSwdenk# but WITHOUT ANY WARRANTY; without even the implied warranty of 15c609719bSwdenk# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16c609719bSwdenk# GNU General Public License for more details. 17c609719bSwdenk# 18c609719bSwdenk# You should have received a copy of the GNU General Public License 19c609719bSwdenk# along with this program; if not, write to the Free Software 20c609719bSwdenk# Foundation, Inc., 59 Temple Place, Suite 330, Boston, 21c609719bSwdenk# MA 02111-1307 USA 22c609719bSwdenk# 23c609719bSwdenk 24c609719bSwdenkSummary: 25c609719bSwdenk======== 26c609719bSwdenk 2724ee89b9SwdenkThis directory contains the source code for U-Boot, a boot loader for 2824ee89b9SwdenkEmbedded boards based on PowerPC and ARM processors, which can be 2924ee89b9Swdenkinstalled in a boot ROM and used to initialize and test the hardware 3024ee89b9Swdenkor to download and run application code. 31c609719bSwdenk 32c609719bSwdenkThe development of U-Boot is closely related to Linux: some parts of 3324ee89b9Swdenkthe source code originate in the Linux source tree, we have some 3424ee89b9Swdenkheader files in common, and special provision has been made to 35c609719bSwdenksupport booting of Linux images. 36c609719bSwdenk 37c609719bSwdenkSome attention has been paid to make this software easily 38c609719bSwdenkconfigurable and extendable. For instance, all monitor commands are 39c609719bSwdenkimplemented with the same call interface, so that it's very easy to 40c609719bSwdenkadd new commands. Also, instead of permanently adding rarely used 41c609719bSwdenkcode (for instance hardware test utilities) to the monitor, you can 42c609719bSwdenkload and run it dynamically. 43c609719bSwdenk 44c609719bSwdenk 45c609719bSwdenkStatus: 46c609719bSwdenk======= 47c609719bSwdenk 48c609719bSwdenkIn general, all boards for which a configuration option exists in the 49c609719bSwdenkMakefile have been tested to some extent and can be considered 50c609719bSwdenk"working". In fact, many of them are used in production systems. 51c609719bSwdenk 52c609719bSwdenkIn case of problems see the CHANGELOG and CREDITS files to find out 53c609719bSwdenkwho contributed the specific port. 54c609719bSwdenk 55c609719bSwdenk 56c609719bSwdenkWhere to get help: 57c609719bSwdenk================== 58c609719bSwdenk 59c609719bSwdenkIn case you have questions about, problems with or contributions for 60c609719bSwdenkU-Boot you should send a message to the U-Boot mailing list at 61c609719bSwdenk<u-boot-users@lists.sourceforge.net>. There is also an archive of 62c609719bSwdenkprevious traffic on the mailing list - please search the archive 63c609719bSwdenkbefore asking FAQ's. Please see 64c609719bSwdenkhttp://lists.sourceforge.net/lists/listinfo/u-boot-users/ 65c609719bSwdenk 66c609719bSwdenk 67c609719bSwdenkWhere we come from: 68c609719bSwdenk=================== 69c609719bSwdenk 70c609719bSwdenk- start from 8xxrom sources 7124ee89b9Swdenk- create PPCBoot project (http://sourceforge.net/projects/ppcboot) 72c609719bSwdenk- clean up code 73c609719bSwdenk- make it easier to add custom boards 74c609719bSwdenk- make it possible to add other [PowerPC] CPUs 75c609719bSwdenk- extend functions, especially: 76c609719bSwdenk * Provide extended interface to Linux boot loader 77c609719bSwdenk * S-Record download 78c609719bSwdenk * network boot 79c609719bSwdenk * PCMCIA / CompactFLash / ATA disk / SCSI ... boot 8024ee89b9Swdenk- create ARMBoot project (http://sourceforge.net/projects/armboot) 81c609719bSwdenk- add other CPU families (starting with ARM) 8224ee89b9Swdenk- create U-Boot project (http://sourceforge.net/projects/u-boot) 8324ee89b9Swdenk 8424ee89b9Swdenk 8524ee89b9SwdenkNames and Spelling: 8624ee89b9Swdenk=================== 8724ee89b9Swdenk 8824ee89b9SwdenkThe "official" name of this project is "Das U-Boot". The spelling 8924ee89b9Swdenk"U-Boot" shall be used in all written text (documentation, comments 9024ee89b9Swdenkin source files etc.). Example: 9124ee89b9Swdenk 9224ee89b9Swdenk This is the README file for the U-Boot project. 9324ee89b9Swdenk 9424ee89b9SwdenkFile names etc. shall be based on the string "u-boot". Examples: 9524ee89b9Swdenk 9624ee89b9Swdenk include/asm-ppc/u-boot.h 9724ee89b9Swdenk 9824ee89b9Swdenk #include <asm/u-boot.h> 9924ee89b9Swdenk 10024ee89b9SwdenkVariable names, preprocessor constants etc. shall be either based on 10124ee89b9Swdenkthe string "u_boot" or on "U_BOOT". Example: 10224ee89b9Swdenk 10324ee89b9Swdenk U_BOOT_VERSION u_boot_logo 10424ee89b9Swdenk IH_OS_U_BOOT u_boot_hush_start 105c609719bSwdenk 106c609719bSwdenk 10793f19cc0SwdenkVersioning: 10893f19cc0Swdenk=========== 10993f19cc0Swdenk 11093f19cc0SwdenkU-Boot uses a 3 level version number containing a version, a 11193f19cc0Swdenksub-version, and a patchlevel: "U-Boot-2.34.5" means version "2", 11293f19cc0Swdenksub-version "34", and patchlevel "4". 11393f19cc0Swdenk 11493f19cc0SwdenkThe patchlevel is used to indicate certain stages of development 11593f19cc0Swdenkbetween released versions, i. e. officially released versions of 11693f19cc0SwdenkU-Boot will always have a patchlevel of "0". 11793f19cc0Swdenk 11893f19cc0Swdenk 119c609719bSwdenkDirectory Hierarchy: 120c609719bSwdenk==================== 121c609719bSwdenk 122c609719bSwdenk- board Board dependend files 123c609719bSwdenk- common Misc architecture independend functions 124c609719bSwdenk- cpu CPU specific files 125c609719bSwdenk- disk Code for disk drive partition handling 126c609719bSwdenk- doc Documentation (don't expect too much) 127c609719bSwdenk- drivers Common used device drivers 128c609719bSwdenk- dtt Digital Thermometer and Thermostat drivers 129c609719bSwdenk- examples Example code for standalone applications, etc. 130c609719bSwdenk- include Header Files 131c609719bSwdenk- disk Harddisk interface code 132c609719bSwdenk- net Networking code 133c609719bSwdenk- ppc Files generic to PowerPC architecture 134c609719bSwdenk- post Power On Self Test 135c609719bSwdenk- post/arch Symlink to architecture specific Power On Self Test 136c609719bSwdenk- post/arch-ppc PowerPC architecture specific Power On Self Test 137c609719bSwdenk- post/cpu/mpc8260 MPC8260 CPU specific Power On Self Test 138c609719bSwdenk- post/cpu/mpc8xx MPC8xx CPU specific Power On Self Test 139c609719bSwdenk- rtc Real Time Clock drivers 140c609719bSwdenk- tools Tools to build S-Record or U-Boot images, etc. 141c609719bSwdenk 142c609719bSwdenk- cpu/74xx_7xx Files specific to Motorola MPC74xx and 7xx CPUs 1430db5bca8Swdenk- cpu/mpc5xx Files specific to Motorola MPC5xx CPUs 144c609719bSwdenk- cpu/mpc8xx Files specific to Motorola MPC8xx CPUs 145c609719bSwdenk- cpu/mpc824x Files specific to Motorola MPC824x CPUs 146c609719bSwdenk- cpu/mpc8260 Files specific to Motorola MPC8260 CPU 147c609719bSwdenk- cpu/ppc4xx Files specific to IBM 4xx CPUs 148c609719bSwdenk 1493bac3513Swdenk- board/LEOX/ Files specific to boards manufactured by The LEOX team 1503bac3513Swdenk- board/LEOX/elpt860 Files specific to ELPT860 boards 151c609719bSwdenk- board/RPXClassic 152c609719bSwdenk Files specific to RPXClassic boards 153c609719bSwdenk- board/RPXlite Files specific to RPXlite boards 1542abbe075Swdenk- board/at91rm9200dk Files specific to AT91RM9200DK boards 155c609719bSwdenk- board/c2mon Files specific to c2mon boards 1560db5bca8Swdenk- board/cmi Files specific to cmi boards 157c609719bSwdenk- board/cogent Files specific to Cogent boards 158c609719bSwdenk (need further configuration) 159c609719bSwdenk Files specific to CPCIISER4 boards 160c609719bSwdenk- board/cpu86 Files specific to CPU86 boards 161c609719bSwdenk- board/cray/ Files specific to boards manufactured by Cray 162c609719bSwdenk- board/cray/L1 Files specific to L1 boards 163c609719bSwdenk- board/cu824 Files specific to CU824 boards 164c609719bSwdenk- board/ebony Files specific to IBM Ebony board 165c609719bSwdenk- board/eric Files specific to ERIC boards 166c609719bSwdenk- board/esd/ Files specific to boards manufactured by ESD 167c609719bSwdenk- board/esd/adciop Files specific to ADCIOP boards 168c609719bSwdenk- board/esd/ar405 Files specific to AR405 boards 169c609719bSwdenk- board/esd/canbt Files specific to CANBT boards 170c609719bSwdenk- board/esd/cpci405 Files specific to CPCI405 boards 171c609719bSwdenk- board/esd/cpciiser4 Files specific to CPCIISER4 boards 172c609719bSwdenk- board/esd/common Common files for ESD boards 173c609719bSwdenk- board/esd/dasa_sim Files specific to DASA_SIM boards 174c609719bSwdenk- board/esd/du405 Files specific to DU405 boards 175c609719bSwdenk- board/esd/ocrtc Files specific to OCRTC boards 176c609719bSwdenk- board/esd/pci405 Files specific to PCI405 boards 177c609719bSwdenk- board/esteem192e 178c609719bSwdenk Files specific to ESTEEM192E boards 179c609719bSwdenk- board/etx094 Files specific to ETX_094 boards 180c609719bSwdenk- board/evb64260 181c609719bSwdenk Files specific to EVB64260 boards 182c609719bSwdenk- board/fads Files specific to FADS boards 183c609719bSwdenk- board/flagadm Files specific to FLAGADM boards 1847aa78614Swdenk- board/gen860t Files specific to GEN860T and GEN860T_SC boards 185c609719bSwdenk- board/genietv Files specific to GENIETV boards 186c609719bSwdenk- board/gth Files specific to GTH boards 187c609719bSwdenk- board/hermes Files specific to HERMES boards 188c609719bSwdenk- board/hymod Files specific to HYMOD boards 189c609719bSwdenk- board/icu862 Files specific to ICU862 boards 190c609719bSwdenk- board/ip860 Files specific to IP860 boards 191c609719bSwdenk- board/iphase4539 192c609719bSwdenk Files specific to Interphase4539 boards 193c609719bSwdenk- board/ivm Files specific to IVMS8/IVML24 boards 194c609719bSwdenk- board/lantec Files specific to LANTEC boards 195c609719bSwdenk- board/lwmon Files specific to LWMON boards 196c609719bSwdenk- board/mbx8xx Files specific to MBX boards 197c609719bSwdenk- board/mpc8260ads 198c609719bSwdenk Files specific to MMPC8260ADS boards 199c609719bSwdenk- board/mpl/ Files specific to boards manufactured by MPL 200c609719bSwdenk- board/mpl/common Common files for MPL boards 201c609719bSwdenk- board/mpl/pip405 Files specific to PIP405 boards 202c609719bSwdenk- board/mpl/mip405 Files specific to MIP405 boards 203c609719bSwdenk- board/musenki Files specific to MUSEKNI boards 204c609719bSwdenk- board/mvs1 Files specific to MVS1 boards 205c609719bSwdenk- board/nx823 Files specific to NX823 boards 206c609719bSwdenk- board/oxc Files specific to OXC boards 207c609719bSwdenk- board/pcippc2 Files specific to PCIPPC2/PCIPPC6 boards 208c609719bSwdenk- board/pm826 Files specific to PM826 boards 209c609719bSwdenk- board/ppmc8260 210c609719bSwdenk Files specific to PPMC8260 boards 211c609719bSwdenk- board/rpxsuper 212c609719bSwdenk Files specific to RPXsuper boards 213c609719bSwdenk- board/rsdproto 214c609719bSwdenk Files specific to RSDproto boards 215c609719bSwdenk- board/sandpoint 216c609719bSwdenk Files specific to Sandpoint boards 217c609719bSwdenk- board/sbc8260 Files specific to SBC8260 boards 218c609719bSwdenk- board/sacsng Files specific to SACSng boards 219c609719bSwdenk- board/siemens Files specific to boards manufactured by Siemens AG 220c609719bSwdenk- board/siemens/CCM Files specific to CCM boards 221c609719bSwdenk- board/siemens/IAD210 Files specific to IAD210 boards 222c609719bSwdenk- board/siemens/SCM Files specific to SCM boards 223c609719bSwdenk- board/siemens/pcu_e Files specific to PCU_E boards 224c609719bSwdenk- board/sixnet Files specific to SIXNET boards 225c609719bSwdenk- board/spd8xx Files specific to SPD8xxTS boards 226c609719bSwdenk- board/tqm8260 Files specific to TQM8260 boards 227c609719bSwdenk- board/tqm8xx Files specific to TQM8xxL boards 228c609719bSwdenk- board/w7o Files specific to W7O boards 229c609719bSwdenk- board/walnut405 230c609719bSwdenk Files specific to Walnut405 boards 231c609719bSwdenk- board/westel/ Files specific to boards manufactured by Westel Wireless 232c609719bSwdenk- board/westel/amx860 Files specific to AMX860 boards 233c609719bSwdenk- board/utx8245 Files specific to UTX8245 boards 234c609719bSwdenk 235c609719bSwdenkSoftware Configuration: 236c609719bSwdenk======================= 237c609719bSwdenk 238c609719bSwdenkConfiguration is usually done using C preprocessor defines; the 239c609719bSwdenkrationale behind that is to avoid dead code whenever possible. 240c609719bSwdenk 241c609719bSwdenkThere are two classes of configuration variables: 242c609719bSwdenk 243c609719bSwdenk* Configuration _OPTIONS_: 244c609719bSwdenk These are selectable by the user and have names beginning with 245c609719bSwdenk "CONFIG_". 246c609719bSwdenk 247c609719bSwdenk* Configuration _SETTINGS_: 248c609719bSwdenk These depend on the hardware etc. and should not be meddled with if 249c609719bSwdenk you don't know what you're doing; they have names beginning with 250c609719bSwdenk "CFG_". 251c609719bSwdenk 252c609719bSwdenkLater we will add a configuration tool - probably similar to or even 253c609719bSwdenkidentical to what's used for the Linux kernel. Right now, we have to 254c609719bSwdenkdo the configuration by hand, which means creating some symbolic 255c609719bSwdenklinks and editing some configuration files. We use the TQM8xxL boards 256c609719bSwdenkas an example here. 257c609719bSwdenk 258c609719bSwdenk 259c609719bSwdenkSelection of Processor Architecture and Board Type: 260c609719bSwdenk--------------------------------------------------- 261c609719bSwdenk 262c609719bSwdenkFor all supported boards there are ready-to-use default 263c609719bSwdenkconfigurations available; just type "make <board_name>_config". 264c609719bSwdenk 265c609719bSwdenkExample: For a TQM823L module type: 266c609719bSwdenk 267c609719bSwdenk cd u-boot 268c609719bSwdenk make TQM823L_config 269c609719bSwdenk 270c609719bSwdenkFor the Cogent platform, you need to specify the cpu type as well; 271c609719bSwdenke.g. "make cogent_mpc8xx_config". And also configure the cogent 272c609719bSwdenkdirectory according to the instructions in cogent/README. 273c609719bSwdenk 274c609719bSwdenk 275c609719bSwdenkConfiguration Options: 276c609719bSwdenk---------------------- 277c609719bSwdenk 278c609719bSwdenkConfiguration depends on the combination of board and CPU type; all 279c609719bSwdenksuch information is kept in a configuration file 280c609719bSwdenk"include/configs/<board_name>.h". 281c609719bSwdenk 282c609719bSwdenkExample: For a TQM823L module, all configuration settings are in 283c609719bSwdenk"include/configs/TQM823L.h". 284c609719bSwdenk 285c609719bSwdenk 2867f6c2cbcSwdenkMany of the options are named exactly as the corresponding Linux 2877f6c2cbcSwdenkkernel configuration options. The intention is to make it easier to 2887f6c2cbcSwdenkbuild a config tool - later. 2897f6c2cbcSwdenk 2907f6c2cbcSwdenk 291c609719bSwdenkThe following options need to be configured: 292c609719bSwdenk 293c609719bSwdenk- CPU Type: Define exactly one of 294c609719bSwdenk 295c609719bSwdenk PowerPC based CPUs: 296c609719bSwdenk ------------------- 297c609719bSwdenk CONFIG_MPC823, CONFIG_MPC850, CONFIG_MPC855, CONFIG_MPC860 2980db5bca8Swdenk or CONFIG_MPC5xx 299c609719bSwdenk or CONFIG_MPC824X, CONFIG_MPC8260 300c609719bSwdenk or CONFIG_IOP480 301c609719bSwdenk or CONFIG_405GP 302c609719bSwdenk or CONFIG_440 303c609719bSwdenk or CONFIG_MPC74xx 30472755c71Swdenk or CONFIG_750FX 305c609719bSwdenk 306c609719bSwdenk ARM based CPUs: 307c609719bSwdenk --------------- 308c609719bSwdenk CONFIG_SA1110 309c609719bSwdenk CONFIG_ARM7 310c609719bSwdenk CONFIG_PXA250 311c609719bSwdenk 312c609719bSwdenk 313c609719bSwdenk- Board Type: Define exactly one of 314c609719bSwdenk 315c609719bSwdenk PowerPC based boards: 316c609719bSwdenk --------------------- 317c609719bSwdenk 318c609719bSwdenk CONFIG_ADCIOP, CONFIG_ICU862 CONFIG_RPXsuper, 319c609719bSwdenk CONFIG_ADS860, CONFIG_IP860, CONFIG_SM850, 320c609719bSwdenk CONFIG_AMX860, CONFIG_IPHASE4539, CONFIG_SPD823TS, 321c609719bSwdenk CONFIG_AR405, CONFIG_IVML24, CONFIG_SXNI855T, 322c609719bSwdenk CONFIG_BAB7xx, CONFIG_IVML24_128, CONFIG_Sandpoint8240, 323c609719bSwdenk CONFIG_CANBT, CONFIG_IVML24_256, CONFIG_Sandpoint8245, 324c609719bSwdenk CONFIG_CCM, CONFIG_IVMS8, CONFIG_TQM823L, 325c609719bSwdenk CONFIG_CPCI405, CONFIG_IVMS8_128, CONFIG_TQM850L, 326c609719bSwdenk CONFIG_CPCI4052, CONFIG_IVMS8_256, CONFIG_TQM855L, 327c609719bSwdenk CONFIG_CPCIISER4, CONFIG_LANTEC, CONFIG_TQM860L, 328c609719bSwdenk CONFIG_CPU86, CONFIG_MBX, CONFIG_TQM8260, 329c609719bSwdenk CONFIG_CRAYL1, CONFIG_MBX860T, CONFIG_TTTech, 330c609719bSwdenk CONFIG_CU824, CONFIG_MHPC, CONFIG_UTX8245, 331c609719bSwdenk CONFIG_DASA_SIM, CONFIG_MIP405, CONFIG_W7OLMC, 332c609719bSwdenk CONFIG_DU405, CONFIG_MOUSSE, CONFIG_W7OLMG, 333c609719bSwdenk CONFIG_ELPPC, CONFIG_MPC8260ADS, CONFIG_WALNUT405, 334c609719bSwdenk CONFIG_ERIC, CONFIG_MUSENKI, CONFIG_ZUMA, 335c609719bSwdenk CONFIG_ESTEEM192E, CONFIG_MVS1, CONFIG_c2mon, 336c609719bSwdenk CONFIG_ETX094, CONFIG_NX823, CONFIG_cogent_mpc8260, 337c609719bSwdenk CONFIG_EVB64260, CONFIG_OCRTC, CONFIG_cogent_mpc8xx, 338c609719bSwdenk CONFIG_FADS823, CONFIG_ORSG, CONFIG_ep8260, 339c609719bSwdenk CONFIG_FADS850SAR, CONFIG_OXC, CONFIG_gw8260, 340c609719bSwdenk CONFIG_FADS860T, CONFIG_PCI405, CONFIG_hermes, 341c609719bSwdenk CONFIG_FLAGADM, CONFIG_PCIPPC2, CONFIG_hymod, 342c609719bSwdenk CONFIG_FPS850L, CONFIG_PCIPPC6, CONFIG_lwmon, 343c609719bSwdenk CONFIG_GEN860T, CONFIG_PIP405, CONFIG_pcu_e, 344c609719bSwdenk CONFIG_GENIETV, CONFIG_PM826, CONFIG_ppmc8260, 345c609719bSwdenk CONFIG_GTH, CONFIG_RPXClassic, CONFIG_rsdproto, 346c609719bSwdenk CONFIG_IAD210, CONFIG_RPXlite, CONFIG_sbc8260, 347608c9146Swdenk CONFIG_EBONY, CONFIG_sacsng, CONFIG_FPS860L, 3487f70e853Swdenk CONFIG_V37, CONFIG_ELPT860, CONFIG_CMI, 349682011ffSwdenk CONFIG_NETVIA, CONFIG_RBC823 350c609719bSwdenk 351c609719bSwdenk ARM based boards: 352c609719bSwdenk ----------------- 353c609719bSwdenk 354c609719bSwdenk CONFIG_HHP_CRADLE, CONFIG_DNP1110, CONFIG_EP7312, 355c609719bSwdenk CONFIG_IMPA7, CONFIG_LART, CONFIG_LUBBOCK, 356c609719bSwdenk CONFIG_SHANNON, CONFIG_SMDK2400, CONFIG_SMDK2410, 3572abbe075Swdenk CONFIG_TRAB, CONFIG_AT91RM9200DK 358c609719bSwdenk 359c609719bSwdenk 360c609719bSwdenk- CPU Module Type: (if CONFIG_COGENT is defined) 361c609719bSwdenk Define exactly one of 362c609719bSwdenk CONFIG_CMA286_60_OLD 363c609719bSwdenk--- FIXME --- not tested yet: 364c609719bSwdenk CONFIG_CMA286_60, CONFIG_CMA286_21, CONFIG_CMA286_60P, 365c609719bSwdenk CONFIG_CMA287_23, CONFIG_CMA287_50 366c609719bSwdenk 367c609719bSwdenk- Motherboard Type: (if CONFIG_COGENT is defined) 368c609719bSwdenk Define exactly one of 369c609719bSwdenk CONFIG_CMA101, CONFIG_CMA102 370c609719bSwdenk 371c609719bSwdenk- Motherboard I/O Modules: (if CONFIG_COGENT is defined) 372c609719bSwdenk Define one or more of 373c609719bSwdenk CONFIG_CMA302 374c609719bSwdenk 375c609719bSwdenk- Motherboard Options: (if CONFIG_CMA101 or CONFIG_CMA102 are defined) 376c609719bSwdenk Define one or more of 377c609719bSwdenk CONFIG_LCD_HEARTBEAT - update a character position on 378c609719bSwdenk the lcd display every second with 379c609719bSwdenk a "rotator" |\-/|\-/ 380c609719bSwdenk 381c609719bSwdenk- MPC824X Family Member (if CONFIG_MPC824X is defined) 382c609719bSwdenk Define exactly one of 383c609719bSwdenk CONFIG_MPC8240, CONFIG_MPC8245 384c609719bSwdenk 385c609719bSwdenk- 8xx CPU Options: (if using an 8xx cpu) 386c609719bSwdenk Define one or more of 387c609719bSwdenk CONFIG_8xx_GCLK_FREQ - if get_gclk_freq() can not work e.g. 388c609719bSwdenk no 32KHz reference PIT/RTC clock 389c609719bSwdenk 390c609719bSwdenk- Clock Interface: 391c609719bSwdenk CONFIG_CLOCKS_IN_MHZ 392c609719bSwdenk 393c609719bSwdenk U-Boot stores all clock information in Hz 394c609719bSwdenk internally. For binary compatibility with older Linux 395c609719bSwdenk kernels (which expect the clocks passed in the 396c609719bSwdenk bd_info data to be in MHz) the environment variable 397c609719bSwdenk "clocks_in_mhz" can be defined so that U-Boot 398c609719bSwdenk converts clock data to MHZ before passing it to the 399c609719bSwdenk Linux kernel. 400c609719bSwdenk 401c609719bSwdenk When CONFIG_CLOCKS_IN_MHZ is defined, a definition of 402c609719bSwdenk "clocks_in_mhz=1" is automatically included in the 403c609719bSwdenk default environment. 404c609719bSwdenk 405c609719bSwdenk- Console Interface: 406c609719bSwdenk Depending on board, define exactly one serial port 407c609719bSwdenk (like CONFIG_8xx_CONS_SMC1, CONFIG_8xx_CONS_SMC2, 408c609719bSwdenk CONFIG_8xx_CONS_SCC1, ...), or switch off the serial 409c609719bSwdenk console by defining CONFIG_8xx_CONS_NONE 410c609719bSwdenk 411c609719bSwdenk Note: if CONFIG_8xx_CONS_NONE is defined, the serial 412c609719bSwdenk port routines must be defined elsewhere 413c609719bSwdenk (i.e. serial_init(), serial_getc(), ...) 414c609719bSwdenk 415c609719bSwdenk CONFIG_CFB_CONSOLE 416c609719bSwdenk Enables console device for a color framebuffer. Needs following 417c609719bSwdenk defines (cf. smiLynxEM, i8042, board/eltec/bab7xx) 418c609719bSwdenk VIDEO_FB_LITTLE_ENDIAN graphic memory organisation 419c609719bSwdenk (default big endian) 420c609719bSwdenk VIDEO_HW_RECTFILL graphic chip supports 421c609719bSwdenk rectangle fill 422c609719bSwdenk (cf. smiLynxEM) 423c609719bSwdenk VIDEO_HW_BITBLT graphic chip supports 424c609719bSwdenk bit-blit (cf. smiLynxEM) 425c609719bSwdenk VIDEO_VISIBLE_COLS visible pixel columns 426c609719bSwdenk (cols=pitch) 427c609719bSwdenk VIDEO_VISIBLE_ROWS visible pixel rows 428c609719bSwdenk VIDEO_PIXEL_SIZE bytes per pixel 429c609719bSwdenk VIDEO_DATA_FORMAT graphic data format 430c609719bSwdenk (0-5, cf. cfb_console.c) 431c609719bSwdenk VIDEO_FB_ADRS framebuffer address 432c609719bSwdenk VIDEO_KBD_INIT_FCT keyboard int fct 433c609719bSwdenk (i.e. i8042_kbd_init()) 434c609719bSwdenk VIDEO_TSTC_FCT test char fct 435c609719bSwdenk (i.e. i8042_tstc) 436c609719bSwdenk VIDEO_GETC_FCT get char fct 437c609719bSwdenk (i.e. i8042_getc) 438c609719bSwdenk CONFIG_CONSOLE_CURSOR cursor drawing on/off 439c609719bSwdenk (requires blink timer 440c609719bSwdenk cf. i8042.c) 441c609719bSwdenk CFG_CONSOLE_BLINK_COUNT blink interval (cf. i8042.c) 442c609719bSwdenk CONFIG_CONSOLE_TIME display time/date info in 443c609719bSwdenk upper right corner 444c609719bSwdenk (requires CFG_CMD_DATE) 445c609719bSwdenk CONFIG_VIDEO_LOGO display Linux logo in 446c609719bSwdenk upper left corner 447a6c7ad2fSwdenk CONFIG_VIDEO_BMP_LOGO use bmp_logo.h instead of 448a6c7ad2fSwdenk linux_logo.h for logo. 449a6c7ad2fSwdenk Requires CONFIG_VIDEO_LOGO 450c609719bSwdenk CONFIG_CONSOLE_EXTRA_INFO 451c609719bSwdenk addional board info beside 452c609719bSwdenk the logo 453c609719bSwdenk 454c609719bSwdenk When CONFIG_CFB_CONSOLE is defined, video console is 455c609719bSwdenk default i/o. Serial console can be forced with 456c609719bSwdenk environment 'console=serial'. 457c609719bSwdenk 458c609719bSwdenk- Console Baudrate: 459c609719bSwdenk CONFIG_BAUDRATE - in bps 460c609719bSwdenk Select one of the baudrates listed in 461c609719bSwdenk CFG_BAUDRATE_TABLE, see below. 462c609719bSwdenk 463c609719bSwdenk- Interrupt driven serial port input: 464c609719bSwdenk CONFIG_SERIAL_SOFTWARE_FIFO 465c609719bSwdenk 466c609719bSwdenk PPC405GP only. 467c609719bSwdenk Use an interrupt handler for receiving data on the 468c609719bSwdenk serial port. It also enables using hardware handshake 469c609719bSwdenk (RTS/CTS) and UART's built-in FIFO. Set the number of 470c609719bSwdenk bytes the interrupt driven input buffer should have. 471c609719bSwdenk 472c609719bSwdenk Set to 0 to disable this feature (this is the default). 473c609719bSwdenk This will also disable hardware handshake. 474c609719bSwdenk 4751d49b1f3Sstroese- Console UART Number: 4761d49b1f3Sstroese CONFIG_UART1_CONSOLE 4771d49b1f3Sstroese 4781d49b1f3Sstroese IBM PPC4xx only. 4791d49b1f3Sstroese If defined internal UART1 (and not UART0) is used 4801d49b1f3Sstroese as default U-Boot console. 4811d49b1f3Sstroese 482c609719bSwdenk- Boot Delay: CONFIG_BOOTDELAY - in seconds 483c609719bSwdenk Delay before automatically booting the default image; 484c609719bSwdenk set to -1 to disable autoboot. 485c609719bSwdenk 486c609719bSwdenk See doc/README.autoboot for these options that 487c609719bSwdenk work with CONFIG_BOOTDELAY. None are required. 488c609719bSwdenk CONFIG_BOOT_RETRY_TIME 489c609719bSwdenk CONFIG_BOOT_RETRY_MIN 490c609719bSwdenk CONFIG_AUTOBOOT_KEYED 491c609719bSwdenk CONFIG_AUTOBOOT_PROMPT 492c609719bSwdenk CONFIG_AUTOBOOT_DELAY_STR 493c609719bSwdenk CONFIG_AUTOBOOT_STOP_STR 494c609719bSwdenk CONFIG_AUTOBOOT_DELAY_STR2 495c609719bSwdenk CONFIG_AUTOBOOT_STOP_STR2 496c609719bSwdenk CONFIG_ZERO_BOOTDELAY_CHECK 497c609719bSwdenk CONFIG_RESET_TO_RETRY 498c609719bSwdenk 499c609719bSwdenk- Autoboot Command: 500c609719bSwdenk CONFIG_BOOTCOMMAND 501c609719bSwdenk Only needed when CONFIG_BOOTDELAY is enabled; 502c609719bSwdenk define a command string that is automatically executed 503c609719bSwdenk when no character is read on the console interface 504c609719bSwdenk within "Boot Delay" after reset. 505c609719bSwdenk 506c609719bSwdenk CONFIG_BOOTARGS 507c609719bSwdenk This can be used to pass arguments to the bootm 508c609719bSwdenk command. The value of CONFIG_BOOTARGS goes into the 509c609719bSwdenk environment value "bootargs". 510c609719bSwdenk 511c609719bSwdenk CONFIG_RAMBOOT and CONFIG_NFSBOOT 512c609719bSwdenk The value of these goes into the environment as 513c609719bSwdenk "ramboot" and "nfsboot" respectively, and can be used 514c609719bSwdenk as a convenience, when switching between booting from 515c609719bSwdenk ram and nfs. 516c609719bSwdenk 517c609719bSwdenk- Pre-Boot Commands: 518c609719bSwdenk CONFIG_PREBOOT 519c609719bSwdenk 520c609719bSwdenk When this option is #defined, the existence of the 521c609719bSwdenk environment variable "preboot" will be checked 522c609719bSwdenk immediately before starting the CONFIG_BOOTDELAY 523c609719bSwdenk countdown and/or running the auto-boot command resp. 524c609719bSwdenk entering interactive mode. 525c609719bSwdenk 526c609719bSwdenk This feature is especially useful when "preboot" is 527c609719bSwdenk automatically generated or modified. For an example 528c609719bSwdenk see the LWMON board specific code: here "preboot" is 529c609719bSwdenk modified when the user holds down a certain 530c609719bSwdenk combination of keys on the (special) keyboard when 531c609719bSwdenk booting the systems 532c609719bSwdenk 533c609719bSwdenk- Serial Download Echo Mode: 534c609719bSwdenk CONFIG_LOADS_ECHO 535c609719bSwdenk If defined to 1, all characters received during a 536c609719bSwdenk serial download (using the "loads" command) are 537c609719bSwdenk echoed back. This might be needed by some terminal 538c609719bSwdenk emulations (like "cu"), but may as well just take 539c609719bSwdenk time on others. This setting #define's the initial 540c609719bSwdenk value of the "loads_echo" environment variable. 541c609719bSwdenk 542c609719bSwdenk- Kgdb Serial Baudrate: (if CFG_CMD_KGDB is defined) 543c609719bSwdenk CONFIG_KGDB_BAUDRATE 544c609719bSwdenk Select one of the baudrates listed in 545c609719bSwdenk CFG_BAUDRATE_TABLE, see below. 546c609719bSwdenk 547c609719bSwdenk- Monitor Functions: 548c609719bSwdenk CONFIG_COMMANDS 549c609719bSwdenk Most monitor functions can be selected (or 550c609719bSwdenk de-selected) by adjusting the definition of 551c609719bSwdenk CONFIG_COMMANDS; to select individual functions, 552c609719bSwdenk #define CONFIG_COMMANDS by "OR"ing any of the 553c609719bSwdenk following values: 554c609719bSwdenk 555c609719bSwdenk #define enables commands: 556c609719bSwdenk ------------------------- 557c609719bSwdenk CFG_CMD_ASKENV * ask for env variable 558c609719bSwdenk CFG_CMD_BDI bdinfo 559c609719bSwdenk CFG_CMD_BEDBUG Include BedBug Debugger 560c609719bSwdenk CFG_CMD_BOOTD bootd 561c609719bSwdenk CFG_CMD_CACHE icache, dcache 562c609719bSwdenk CFG_CMD_CONSOLE coninfo 563c609719bSwdenk CFG_CMD_DATE * support for RTC, date/time... 564c609719bSwdenk CFG_CMD_DHCP DHCP support 565c609719bSwdenk CFG_CMD_ECHO * echo arguments 566c609719bSwdenk CFG_CMD_EEPROM * EEPROM read/write support 567c609719bSwdenk CFG_CMD_ELF bootelf, bootvx 568c609719bSwdenk CFG_CMD_ENV saveenv 569c609719bSwdenk CFG_CMD_FDC * Floppy Disk Support 57071f95118Swdenk CFG_CMD_FAT FAT partition support 5712262cfeeSwdenk CFG_CMD_FDOS * Dos diskette Support 572c609719bSwdenk CFG_CMD_FLASH flinfo, erase, protect 573c609719bSwdenk CFG_CMD_FPGA FPGA device initialization support 574c609719bSwdenk CFG_CMD_I2C * I2C serial bus support 575c609719bSwdenk CFG_CMD_IDE * IDE harddisk support 576c609719bSwdenk CFG_CMD_IMI iminfo 577c609719bSwdenk CFG_CMD_IMMAP * IMMR dump support 578c609719bSwdenk CFG_CMD_IRQ * irqinfo 579c609719bSwdenk CFG_CMD_KGDB * kgdb 580c609719bSwdenk CFG_CMD_LOADB loadb 581c609719bSwdenk CFG_CMD_LOADS loads 582c609719bSwdenk CFG_CMD_MEMORY md, mm, nm, mw, cp, cmp, crc, base, 583c609719bSwdenk loop, mtest 58471f95118Swdenk CFG_CMD_MMC MMC memory mapped support 585c609719bSwdenk CFG_CMD_MII MII utility commands 586c609719bSwdenk CFG_CMD_NET bootp, tftpboot, rarpboot 587c609719bSwdenk CFG_CMD_PCI * pciinfo 588c609719bSwdenk CFG_CMD_PCMCIA * PCMCIA support 589c609719bSwdenk CFG_CMD_REGINFO * Register dump 590c609719bSwdenk CFG_CMD_RUN run command in env variable 591c609719bSwdenk CFG_CMD_SCSI * SCSI Support 592c609719bSwdenk CFG_CMD_SETGETDCR Support for DCR Register access (4xx only) 593c609719bSwdenk CFG_CMD_SPI * SPI serial bus support 594c609719bSwdenk CFG_CMD_USB * USB support 595c609719bSwdenk CFG_CMD_BSP * Board SPecific functions 596c609719bSwdenk ----------------------------------------------- 597c609719bSwdenk CFG_CMD_ALL all 598c609719bSwdenk 599c609719bSwdenk CFG_CMD_DFL Default configuration; at the moment 600c609719bSwdenk this is includes all commands, except 601c609719bSwdenk the ones marked with "*" in the list 602c609719bSwdenk above. 603c609719bSwdenk 604c609719bSwdenk If you don't define CONFIG_COMMANDS it defaults to 605c609719bSwdenk CFG_CMD_DFL in include/cmd_confdefs.h. A board can 606c609719bSwdenk override the default settings in the respective 607c609719bSwdenk include file. 608c609719bSwdenk 609c609719bSwdenk EXAMPLE: If you want all functions except of network 610c609719bSwdenk support you can write: 611c609719bSwdenk 612c609719bSwdenk #define CONFIG_COMMANDS (CFG_CMD_ALL & ~CFG_CMD_NET) 613c609719bSwdenk 614c609719bSwdenk 615c609719bSwdenk Note: Don't enable the "icache" and "dcache" commands 616c609719bSwdenk (configuration option CFG_CMD_CACHE) unless you know 617c609719bSwdenk what you (and your U-Boot users) are doing. Data 618c609719bSwdenk cache cannot be enabled on systems like the 8xx or 619c609719bSwdenk 8260 (where accesses to the IMMR region must be 620c609719bSwdenk uncached), and it cannot be disabled on all other 621c609719bSwdenk systems where we (mis-) use the data cache to hold an 622c609719bSwdenk initial stack and some data. 623c609719bSwdenk 624c609719bSwdenk 625c609719bSwdenk XXX - this list needs to get updated! 626c609719bSwdenk 627c609719bSwdenk- Watchdog: 628c609719bSwdenk CONFIG_WATCHDOG 629c609719bSwdenk If this variable is defined, it enables watchdog 630c609719bSwdenk support. There must support in the platform specific 631c609719bSwdenk code for a watchdog. For the 8xx and 8260 CPUs, the 632c609719bSwdenk SIU Watchdog feature is enabled in the SYPCR 633c609719bSwdenk register. 634c609719bSwdenk 635c1551ea8Sstroese- U-Boot Version: 636c1551ea8Sstroese CONFIG_VERSION_VARIABLE 637c1551ea8Sstroese If this variable is defined, an environment variable 638c1551ea8Sstroese named "ver" is created by U-Boot showing the U-Boot 639c1551ea8Sstroese version as printed by the "version" command. 640c1551ea8Sstroese This variable is readonly. 641c1551ea8Sstroese 642c609719bSwdenk- Real-Time Clock: 643c609719bSwdenk 644c609719bSwdenk When CFG_CMD_DATE is selected, the type of the RTC 645c609719bSwdenk has to be selected, too. Define exactly one of the 646c609719bSwdenk following options: 647c609719bSwdenk 648c609719bSwdenk CONFIG_RTC_MPC8xx - use internal RTC of MPC8xx 649c609719bSwdenk CONFIG_RTC_PCF8563 - use Philips PCF8563 RTC 650c609719bSwdenk CONFIG_RTC_MC146818 - use MC146818 RTC 6511cb8e980Swdenk CONFIG_RTC_DS1307 - use Maxim, Inc. DS1307 RTC 652c609719bSwdenk CONFIG_RTC_DS1337 - use Maxim, Inc. DS1337 RTC 6537f70e853Swdenk CONFIG_RTC_DS1338 - use Maxim, Inc. DS1338 RTC 6543bac3513Swdenk CONFIG_RTC_DS164x - use Dallas DS164x RTC 655c609719bSwdenk 656b37c7e5eSwdenk Note that if the RTC uses I2C, then the I2C interface 657b37c7e5eSwdenk must also be configured. See I2C Support, below. 658b37c7e5eSwdenk 659c609719bSwdenk- Timestamp Support: 660c609719bSwdenk 661c609719bSwdenk When CONFIG_TIMESTAMP is selected, the timestamp 662c609719bSwdenk (date and time) of an image is printed by image 663c609719bSwdenk commands like bootm or iminfo. This option is 664c609719bSwdenk automatically enabled when you select CFG_CMD_DATE . 665c609719bSwdenk 666c609719bSwdenk- Partition Support: 667c609719bSwdenk CONFIG_MAC_PARTITION and/or CONFIG_DOS_PARTITION 668c609719bSwdenk and/or CONFIG_ISO_PARTITION 669c609719bSwdenk 670c609719bSwdenk If IDE or SCSI support is enabled (CFG_CMD_IDE or 671c609719bSwdenk CFG_CMD_SCSI) you must configure support for at least 672c609719bSwdenk one partition type as well. 673c609719bSwdenk 674c609719bSwdenk- IDE Reset method: 675c609719bSwdenk CONFIG_IDE_RESET_ROUTINE 676c609719bSwdenk 677c609719bSwdenk Set this to define that instead of a reset Pin, the 678c609719bSwdenk routine ide_set_reset(int idereset) will be used. 679c609719bSwdenk 680c609719bSwdenk- ATAPI Support: 681c609719bSwdenk CONFIG_ATAPI 682c609719bSwdenk 683c609719bSwdenk Set this to enable ATAPI support. 684c609719bSwdenk 685c609719bSwdenk- SCSI Support: 686c609719bSwdenk At the moment only there is only support for the 687c609719bSwdenk SYM53C8XX SCSI controller; define 688c609719bSwdenk CONFIG_SCSI_SYM53C8XX to enable it. 689c609719bSwdenk 690c609719bSwdenk CFG_SCSI_MAX_LUN [8], CFG_SCSI_MAX_SCSI_ID [7] and 691c609719bSwdenk CFG_SCSI_MAX_DEVICE [CFG_SCSI_MAX_SCSI_ID * 692c609719bSwdenk CFG_SCSI_MAX_LUN] can be adjusted to define the 693c609719bSwdenk maximum numbers of LUNs, SCSI ID's and target 694c609719bSwdenk devices. 695c609719bSwdenk CFG_SCSI_SYM53C8XX_CCF to fix clock timing (80Mhz) 696c609719bSwdenk 697c609719bSwdenk- NETWORK Support (PCI): 698682011ffSwdenk CONFIG_E1000 699682011ffSwdenk Support for Intel 8254x gigabit chips. 700682011ffSwdenk 701c609719bSwdenk CONFIG_EEPRO100 702c609719bSwdenk Support for Intel 82557/82559/82559ER chips. 703c609719bSwdenk Optional CONFIG_EEPRO100_SROM_WRITE enables eeprom 704c609719bSwdenk write routine for first time initialisation. 705c609719bSwdenk 706c609719bSwdenk CONFIG_TULIP 707c609719bSwdenk Support for Digital 2114x chips. 708c609719bSwdenk Optional CONFIG_TULIP_SELECT_MEDIA for board specific 709c609719bSwdenk modem chip initialisation (KS8761/QS6611). 710c609719bSwdenk 711c609719bSwdenk CONFIG_NATSEMI 712c609719bSwdenk Support for National dp83815 chips. 713c609719bSwdenk 714c609719bSwdenk CONFIG_NS8382X 715c609719bSwdenk Support for National dp8382[01] gigabit chips. 716c609719bSwdenk 71745219c46Swdenk- NETWORK Support (other): 71845219c46Swdenk 71945219c46Swdenk CONFIG_DRIVER_LAN91C96 72045219c46Swdenk Support for SMSC's LAN91C96 chips. 72145219c46Swdenk 72245219c46Swdenk CONFIG_LAN91C96_BASE 72345219c46Swdenk Define this to hold the physical address 72445219c46Swdenk of the LAN91C96's I/O space 72545219c46Swdenk 72645219c46Swdenk CONFIG_LAN91C96_USE_32_BIT 72745219c46Swdenk Define this to enable 32 bit addressing 72845219c46Swdenk 729c609719bSwdenk- USB Support: 730c609719bSwdenk At the moment only the UHCI host controller is 731c609719bSwdenk supported (PIP405, MIP405); define 732c609719bSwdenk CONFIG_USB_UHCI to enable it. 733c609719bSwdenk define CONFIG_USB_KEYBOARD to enable the USB Keyboard 734c609719bSwdenk end define CONFIG_USB_STORAGE to enable the USB 735c609719bSwdenk storage devices. 736c609719bSwdenk Note: 737c609719bSwdenk Supported are USB Keyboards and USB Floppy drives 738c609719bSwdenk (TEAC FD-05PUB). 739c609719bSwdenk 74071f95118Swdenk- MMC Support: 74171f95118Swdenk The MMC controller on the Intel PXA is supported. To 74271f95118Swdenk enable this define CONFIG_MMC. The MMC can be 74371f95118Swdenk accessed from the boot prompt by mapping the device 74471f95118Swdenk to physical memory similar to flash. Command line is 74571f95118Swdenk enabled with CFG_CMD_MMC. The MMC driver also works with 74671f95118Swdenk the FAT fs. This is enabled with CFG_CMD_FAT. 74771f95118Swdenk 748c609719bSwdenk- Keyboard Support: 749c609719bSwdenk CONFIG_ISA_KEYBOARD 750c609719bSwdenk 751c609719bSwdenk Define this to enable standard (PC-Style) keyboard 752c609719bSwdenk support 753c609719bSwdenk 754c609719bSwdenk CONFIG_I8042_KBD 755c609719bSwdenk Standard PC keyboard driver with US (is default) and 756c609719bSwdenk GERMAN key layout (switch via environment 'keymap=de') support. 757c609719bSwdenk Export function i8042_kbd_init, i8042_tstc and i8042_getc 758c609719bSwdenk for cfb_console. Supports cursor blinking. 759c609719bSwdenk 760c609719bSwdenk- Video support: 761c609719bSwdenk CONFIG_VIDEO 762c609719bSwdenk 763c609719bSwdenk Define this to enable video support (for output to 764c609719bSwdenk video). 765c609719bSwdenk 766c609719bSwdenk CONFIG_VIDEO_CT69000 767c609719bSwdenk 768c609719bSwdenk Enable Chips & Technologies 69000 Video chip 769c609719bSwdenk 770c609719bSwdenk CONFIG_VIDEO_SMI_LYNXEM 771c609719bSwdenk Enable Silicon Motion SMI 712/710/810 Video chip 772c609719bSwdenk Videomode are selected via environment 'videomode' with 773c609719bSwdenk standard LiLo mode numbers. 774c609719bSwdenk Following modes are supported (* is default): 775c609719bSwdenk 776c609719bSwdenk 800x600 1024x768 1280x1024 777c609719bSwdenk 256 (8bit) 303* 305 307 778c609719bSwdenk 65536 (16bit) 314 317 31a 779c609719bSwdenk 16,7 Mill (24bit) 315 318 31b 780c609719bSwdenk (i.e. setenv videomode 317; saveenv; reset;) 781c609719bSwdenk 782a6c7ad2fSwdenk CONFIG_VIDEO_SED13806 783a6c7ad2fSwdenk Enable Epson SED13806 driver. This driver supports 8bpp 784a6c7ad2fSwdenk and 16bpp modes defined by CONFIG_VIDEO_SED13806_8BPP 785a6c7ad2fSwdenk or CONFIG_VIDEO_SED13806_16BPP 786a6c7ad2fSwdenk 787682011ffSwdenk- Keyboard Support: 788682011ffSwdenk CONFIG_KEYBOARD 789682011ffSwdenk 790682011ffSwdenk Define this to enable a custom keyboard support. 791682011ffSwdenk This simply calls drv_keyboard_init() which must be 792682011ffSwdenk defined in your board-specific files. 793682011ffSwdenk The only board using this so far is RBC823. 794a6c7ad2fSwdenk 795c609719bSwdenk- LCD Support: CONFIG_LCD 796c609719bSwdenk 797c609719bSwdenk Define this to enable LCD support (for output to LCD 798c609719bSwdenk display); also select one of the supported displays 799c609719bSwdenk by defining one of these: 800c609719bSwdenk 801c609719bSwdenk CONFIG_NEC_NL6648AC33: 802c609719bSwdenk 803c609719bSwdenk NEC NL6648AC33-18. Active, color, single scan. 804c609719bSwdenk 805c609719bSwdenk CONFIG_NEC_NL6648BC20 806c609719bSwdenk 807c609719bSwdenk NEC NL6648BC20-08. 6.5", 640x480. 808c609719bSwdenk Active, color, single scan. 809c609719bSwdenk 810c609719bSwdenk CONFIG_SHARP_16x9 811c609719bSwdenk 812c609719bSwdenk Sharp 320x240. Active, color, single scan. 813c609719bSwdenk It isn't 16x9, and I am not sure what it is. 814c609719bSwdenk 815c609719bSwdenk CONFIG_SHARP_LQ64D341 816c609719bSwdenk 817c609719bSwdenk Sharp LQ64D341 display, 640x480. 818c609719bSwdenk Active, color, single scan. 819c609719bSwdenk 820c609719bSwdenk CONFIG_HLD1045 821c609719bSwdenk 822c609719bSwdenk HLD1045 display, 640x480. 823c609719bSwdenk Active, color, single scan. 824c609719bSwdenk 825c609719bSwdenk CONFIG_OPTREX_BW 826c609719bSwdenk 827c609719bSwdenk Optrex CBL50840-2 NF-FW 99 22 M5 828c609719bSwdenk or 829c609719bSwdenk Hitachi LMG6912RPFC-00T 830c609719bSwdenk or 831c609719bSwdenk Hitachi SP14Q002 832c609719bSwdenk 833c609719bSwdenk 320x240. Black & white. 834c609719bSwdenk 835c609719bSwdenk Normally display is black on white background; define 836c609719bSwdenk CFG_WHITE_ON_BLACK to get it inverted. 837c609719bSwdenk 838d791b1dcSwdenk- Spash Screen Support: CONFIG_SPLASH_SCREEN 839d791b1dcSwdenk 840d791b1dcSwdenk If this option is set, the environment is checked for 841d791b1dcSwdenk a variable "splashimage". If found, the usual display 842d791b1dcSwdenk of logo, copyright and system information on the LCD 843d791b1dcSwdenk is supressed and the BMP image at the address 844d791b1dcSwdenk specified in "splashimage" is loaded instead. The 845d791b1dcSwdenk console is redirected to the "nulldev", too. This 846d791b1dcSwdenk allows for a "silent" boot where a splash screen is 847d791b1dcSwdenk loaded very quickly after power-on. 848d791b1dcSwdenk 849d791b1dcSwdenk 850c609719bSwdenk- Ethernet address: 851c609719bSwdenk CONFIG_ETHADDR 852c609719bSwdenk CONFIG_ETH2ADDR 853c609719bSwdenk CONFIG_ETH3ADDR 854c609719bSwdenk 855c609719bSwdenk Define a default value for ethernet address to use 856c609719bSwdenk for the respective ethernet interface, in case this 857c609719bSwdenk is not determined automatically. 858c609719bSwdenk 859c609719bSwdenk- IP address: 860c609719bSwdenk CONFIG_IPADDR 861c609719bSwdenk 862c609719bSwdenk Define a default value for the IP address to use for 863c609719bSwdenk the default ethernet interface, in case this is not 864c609719bSwdenk determined through e.g. bootp. 865c609719bSwdenk 866c609719bSwdenk- Server IP address: 867c609719bSwdenk CONFIG_SERVERIP 868c609719bSwdenk 869c609719bSwdenk Defines a default value for theIP address of a TFTP 870c609719bSwdenk server to contact when using the "tftboot" command. 871c609719bSwdenk 872c609719bSwdenk- BOOTP Recovery Mode: 873c609719bSwdenk CONFIG_BOOTP_RANDOM_DELAY 874c609719bSwdenk 875c609719bSwdenk If you have many targets in a network that try to 876c609719bSwdenk boot using BOOTP, you may want to avoid that all 877c609719bSwdenk systems send out BOOTP requests at precisely the same 878c609719bSwdenk moment (which would happen for instance at recovery 879c609719bSwdenk from a power failure, when all systems will try to 880c609719bSwdenk boot, thus flooding the BOOTP server. Defining 881c609719bSwdenk CONFIG_BOOTP_RANDOM_DELAY causes a random delay to be 882c609719bSwdenk inserted before sending out BOOTP requests. The 883c609719bSwdenk following delays are insterted then: 884c609719bSwdenk 885c609719bSwdenk 1st BOOTP request: delay 0 ... 1 sec 886c609719bSwdenk 2nd BOOTP request: delay 0 ... 2 sec 887c609719bSwdenk 3rd BOOTP request: delay 0 ... 4 sec 888c609719bSwdenk 4th and following 889c609719bSwdenk BOOTP requests: delay 0 ... 8 sec 890c609719bSwdenk 891c609719bSwdenk- Status LED: CONFIG_STATUS_LED 892c609719bSwdenk 893c609719bSwdenk Several configurations allow to display the current 894c609719bSwdenk status using a LED. For instance, the LED will blink 895c609719bSwdenk fast while running U-Boot code, stop blinking as 896c609719bSwdenk soon as a reply to a BOOTP request was received, and 897c609719bSwdenk start blinking slow once the Linux kernel is running 898c609719bSwdenk (supported by a status LED driver in the Linux 899c609719bSwdenk kernel). Defining CONFIG_STATUS_LED enables this 900c609719bSwdenk feature in U-Boot. 901c609719bSwdenk 902c609719bSwdenk- CAN Support: CONFIG_CAN_DRIVER 903c609719bSwdenk 904c609719bSwdenk Defining CONFIG_CAN_DRIVER enables CAN driver support 905c609719bSwdenk on those systems that support this (optional) 906c609719bSwdenk feature, like the TQM8xxL modules. 907c609719bSwdenk 908c609719bSwdenk- I2C Support: CONFIG_HARD_I2C | CONFIG_SOFT_I2C 909c609719bSwdenk 910b37c7e5eSwdenk These enable I2C serial bus commands. Defining either of 911b37c7e5eSwdenk (but not both of) CONFIG_HARD_I2C or CONFIG_SOFT_I2C will 912b37c7e5eSwdenk include the appropriate I2C driver for the selected cpu. 913c609719bSwdenk 914b37c7e5eSwdenk This will allow you to use i2c commands at the u-boot 915b37c7e5eSwdenk command line (as long as you set CFG_CMD_I2C in 916b37c7e5eSwdenk CONFIG_COMMANDS) and communicate with i2c based realtime 917b37c7e5eSwdenk clock chips. See common/cmd_i2c.c for a description of the 918c609719bSwdenk command line interface. 919c609719bSwdenk 920b37c7e5eSwdenk CONFIG_HARD_I2C selects the CPM hardware driver for I2C. 921c609719bSwdenk 922b37c7e5eSwdenk CONFIG_SOFT_I2C configures u-boot to use a software (aka 923b37c7e5eSwdenk bit-banging) driver instead of CPM or similar hardware 924b37c7e5eSwdenk support for I2C. 925c609719bSwdenk 926b37c7e5eSwdenk There are several other quantities that must also be 927b37c7e5eSwdenk defined when you define CONFIG_HARD_I2C or CONFIG_SOFT_I2C. 928c609719bSwdenk 929b37c7e5eSwdenk In both cases you will need to define CFG_I2C_SPEED 930b37c7e5eSwdenk to be the frequency (in Hz) at which you wish your i2c bus 931b37c7e5eSwdenk to run and CFG_I2C_SLAVE to be the address of this node (ie 932b37c7e5eSwdenk the cpu's i2c node address). 933c609719bSwdenk 934b37c7e5eSwdenk Now, the u-boot i2c code for the mpc8xx (cpu/mpc8xx/i2c.c) 935b37c7e5eSwdenk sets the cpu up as a master node and so its address should 936b37c7e5eSwdenk therefore be cleared to 0 (See, eg, MPC823e User's Manual 937b37c7e5eSwdenk p.16-473). So, set CFG_I2C_SLAVE to 0. 938b37c7e5eSwdenk 939b37c7e5eSwdenk That's all that's required for CONFIG_HARD_I2C. 940b37c7e5eSwdenk 941b37c7e5eSwdenk If you use the software i2c interface (CONFIG_SOFT_I2C) 942b37c7e5eSwdenk then the following macros need to be defined (examples are 943b37c7e5eSwdenk from include/configs/lwmon.h): 944c609719bSwdenk 945c609719bSwdenk I2C_INIT 946c609719bSwdenk 947b37c7e5eSwdenk (Optional). Any commands necessary to enable the I2C 948c609719bSwdenk controller or configure ports. 949c609719bSwdenk 950b37c7e5eSwdenk eg: #define I2C_INIT (immr->im_cpm.cp_pbdir |= PB_SCL) 951b37c7e5eSwdenk 952c609719bSwdenk I2C_PORT 953c609719bSwdenk 954c609719bSwdenk (Only for MPC8260 CPU). The I/O port to use (the code 955c609719bSwdenk assumes both bits are on the same port). Valid values 956c609719bSwdenk are 0..3 for ports A..D. 957c609719bSwdenk 958c609719bSwdenk I2C_ACTIVE 959c609719bSwdenk 960c609719bSwdenk The code necessary to make the I2C data line active 961c609719bSwdenk (driven). If the data line is open collector, this 962c609719bSwdenk define can be null. 963c609719bSwdenk 964b37c7e5eSwdenk eg: #define I2C_ACTIVE (immr->im_cpm.cp_pbdir |= PB_SDA) 965b37c7e5eSwdenk 966c609719bSwdenk I2C_TRISTATE 967c609719bSwdenk 968c609719bSwdenk The code necessary to make the I2C data line tri-stated 969c609719bSwdenk (inactive). If the data line is open collector, this 970c609719bSwdenk define can be null. 971c609719bSwdenk 972b37c7e5eSwdenk eg: #define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA) 973b37c7e5eSwdenk 974c609719bSwdenk I2C_READ 975c609719bSwdenk 976c609719bSwdenk Code that returns TRUE if the I2C data line is high, 977c609719bSwdenk FALSE if it is low. 978c609719bSwdenk 979b37c7e5eSwdenk eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0) 980b37c7e5eSwdenk 981c609719bSwdenk I2C_SDA(bit) 982c609719bSwdenk 983c609719bSwdenk If <bit> is TRUE, sets the I2C data line high. If it 984c609719bSwdenk is FALSE, it clears it (low). 985c609719bSwdenk 986b37c7e5eSwdenk eg: #define I2C_SDA(bit) \ 987b37c7e5eSwdenk if(bit) immr->im_cpm.cp_pbdat |= PB_SDA; \ 988b37c7e5eSwdenk else immr->im_cpm.cp_pbdat &= ~PB_SDA 989b37c7e5eSwdenk 990c609719bSwdenk I2C_SCL(bit) 991c609719bSwdenk 992c609719bSwdenk If <bit> is TRUE, sets the I2C clock line high. If it 993c609719bSwdenk is FALSE, it clears it (low). 994c609719bSwdenk 995b37c7e5eSwdenk eg: #define I2C_SCL(bit) \ 996b37c7e5eSwdenk if(bit) immr->im_cpm.cp_pbdat |= PB_SCL; \ 997b37c7e5eSwdenk else immr->im_cpm.cp_pbdat &= ~PB_SCL 998b37c7e5eSwdenk 999c609719bSwdenk I2C_DELAY 1000c609719bSwdenk 1001c609719bSwdenk This delay is invoked four times per clock cycle so this 1002c609719bSwdenk controls the rate of data transfer. The data rate thus 1003b37c7e5eSwdenk is 1 / (I2C_DELAY * 4). Often defined to be something 1004b37c7e5eSwdenk like: 1005b37c7e5eSwdenk 1006b37c7e5eSwdenk #define I2C_DELAY udelay(2) 1007c609719bSwdenk 100847cd00faSwdenk CFG_I2C_INIT_BOARD 100947cd00faSwdenk 101047cd00faSwdenk When a board is reset during an i2c bus transfer 101147cd00faSwdenk chips might think that the current transfer is still 101247cd00faSwdenk in progress. On some boards it is possible to access 101347cd00faSwdenk the i2c SCLK line directly, either by using the 101447cd00faSwdenk processor pin as a GPIO or by having a second pin 101547cd00faSwdenk connected to the bus. If this option is defined a 101647cd00faSwdenk custom i2c_init_board() routine in boards/xxx/board.c 101747cd00faSwdenk is run early in the boot sequence. 101847cd00faSwdenk 1019c609719bSwdenk- SPI Support: CONFIG_SPI 1020c609719bSwdenk 1021c609719bSwdenk Enables SPI driver (so far only tested with 1022c609719bSwdenk SPI EEPROM, also an instance works with Crystal A/D and 1023c609719bSwdenk D/As on the SACSng board) 1024c609719bSwdenk 1025c609719bSwdenk CONFIG_SPI_X 1026c609719bSwdenk 1027c609719bSwdenk Enables extended (16-bit) SPI EEPROM addressing. 1028c609719bSwdenk (symmetrical to CONFIG_I2C_X) 1029c609719bSwdenk 1030c609719bSwdenk CONFIG_SOFT_SPI 1031c609719bSwdenk 1032c609719bSwdenk Enables a software (bit-bang) SPI driver rather than 1033c609719bSwdenk using hardware support. This is a general purpose 1034c609719bSwdenk driver that only requires three general I/O port pins 1035c609719bSwdenk (two outputs, one input) to function. If this is 1036c609719bSwdenk defined, the board configuration must define several 1037c609719bSwdenk SPI configuration items (port pins to use, etc). For 1038c609719bSwdenk an example, see include/configs/sacsng.h. 1039c609719bSwdenk 1040c609719bSwdenk- FPGA Support: CONFIG_FPGA_COUNT 1041c609719bSwdenk 1042c609719bSwdenk Specify the number of FPGA devices to support. 1043c609719bSwdenk 1044c609719bSwdenk CONFIG_FPGA 1045c609719bSwdenk 1046c609719bSwdenk Used to specify the types of FPGA devices. For 1047c609719bSwdenk example, 1048c609719bSwdenk #define CONFIG_FPGA CFG_XILINX_VIRTEX2 1049c609719bSwdenk 1050c609719bSwdenk CFG_FPGA_PROG_FEEDBACK 1051c609719bSwdenk 1052c609719bSwdenk Enable printing of hash marks during FPGA 1053c609719bSwdenk configuration. 1054c609719bSwdenk 1055c609719bSwdenk CFG_FPGA_CHECK_BUSY 1056c609719bSwdenk 1057c609719bSwdenk Enable checks on FPGA configuration interface busy 1058c609719bSwdenk status by the configuration function. This option 1059c609719bSwdenk will require a board or device specific function to 1060c609719bSwdenk be written. 1061c609719bSwdenk 1062c609719bSwdenk CONFIG_FPGA_DELAY 1063c609719bSwdenk 1064c609719bSwdenk If defined, a function that provides delays in the 1065c609719bSwdenk FPGA configuration driver. 1066c609719bSwdenk 1067c609719bSwdenk CFG_FPGA_CHECK_CTRLC 1068c609719bSwdenk 1069c609719bSwdenk Allow Control-C to interrupt FPGA configuration 1070c609719bSwdenk 1071c609719bSwdenk CFG_FPGA_CHECK_ERROR 1072c609719bSwdenk 1073c609719bSwdenk Check for configuration errors during FPGA bitfile 1074c609719bSwdenk loading. For example, abort during Virtex II 1075c609719bSwdenk configuration if the INIT_B line goes low (which 1076c609719bSwdenk indicated a CRC error). 1077c609719bSwdenk 1078c609719bSwdenk CFG_FPGA_WAIT_INIT 1079c609719bSwdenk 1080c609719bSwdenk Maximum time to wait for the INIT_B line to deassert 1081c609719bSwdenk after PROB_B has been deasserted during a Virtex II 1082c609719bSwdenk FPGA configuration sequence. The default time is 500 mS. 1083c609719bSwdenk 1084c609719bSwdenk CFG_FPGA_WAIT_BUSY 1085c609719bSwdenk 1086c609719bSwdenk Maximum time to wait for BUSY to deassert during 1087c609719bSwdenk Virtex II FPGA configuration. The default is 5 mS. 1088c609719bSwdenk 1089c609719bSwdenk CFG_FPGA_WAIT_CONFIG 1090c609719bSwdenk 1091c609719bSwdenk Time to wait after FPGA configuration. The default is 1092c609719bSwdenk 200 mS. 1093c609719bSwdenk 1094c609719bSwdenk- FPGA Support: CONFIG_FPGA_COUNT 1095c609719bSwdenk 1096c609719bSwdenk Specify the number of FPGA devices to support. 1097c609719bSwdenk 1098c609719bSwdenk CONFIG_FPGA 1099c609719bSwdenk 1100c609719bSwdenk Used to specify the types of FPGA devices. For example, 1101c609719bSwdenk #define CONFIG_FPGA CFG_XILINX_VIRTEX2 1102c609719bSwdenk 1103c609719bSwdenk CFG_FPGA_PROG_FEEDBACK 1104c609719bSwdenk 1105c609719bSwdenk Enable printing of hash marks during FPGA configuration. 1106c609719bSwdenk 1107c609719bSwdenk CFG_FPGA_CHECK_BUSY 1108c609719bSwdenk 1109c609719bSwdenk Enable checks on FPGA configuration interface busy 1110c609719bSwdenk status by the configuration function. This option 1111c609719bSwdenk will require a board or device specific function to 1112c609719bSwdenk be written. 1113c609719bSwdenk 1114c609719bSwdenk CONFIG_FPGA_DELAY 1115c609719bSwdenk 1116c609719bSwdenk If defined, a function that provides delays in the FPGA 1117c609719bSwdenk configuration driver. 1118c609719bSwdenk 1119c609719bSwdenk CFG_FPGA_CHECK_CTRLC 1120c609719bSwdenk Allow Control-C to interrupt FPGA configuration 1121c609719bSwdenk 1122c609719bSwdenk CFG_FPGA_CHECK_ERROR 1123c609719bSwdenk 1124c609719bSwdenk Check for configuration errors during FPGA bitfile 1125c609719bSwdenk loading. For example, abort during Virtex II 1126c609719bSwdenk configuration if the INIT_B line goes low (which 1127c609719bSwdenk indicated a CRC error). 1128c609719bSwdenk 1129c609719bSwdenk CFG_FPGA_WAIT_INIT 1130c609719bSwdenk 1131c609719bSwdenk Maximum time to wait for the INIT_B line to deassert 1132c609719bSwdenk after PROB_B has been deasserted during a Virtex II 1133c609719bSwdenk FPGA configuration sequence. The default time is 500 1134c609719bSwdenk mS. 1135c609719bSwdenk 1136c609719bSwdenk CFG_FPGA_WAIT_BUSY 1137c609719bSwdenk 1138c609719bSwdenk Maximum time to wait for BUSY to deassert during 1139c609719bSwdenk Virtex II FPGA configuration. The default is 5 mS. 1140c609719bSwdenk 1141c609719bSwdenk CFG_FPGA_WAIT_CONFIG 1142c609719bSwdenk 1143c609719bSwdenk Time to wait after FPGA configuration. The default is 1144c609719bSwdenk 200 mS. 1145c609719bSwdenk 1146c609719bSwdenk- Configuration Management: 1147c609719bSwdenk CONFIG_IDENT_STRING 1148c609719bSwdenk 1149c609719bSwdenk If defined, this string will be added to the U-Boot 1150c609719bSwdenk version information (U_BOOT_VERSION) 1151c609719bSwdenk 1152c609719bSwdenk- Vendor Parameter Protection: 1153c609719bSwdenk 1154c609719bSwdenk U-Boot considers the values of the environment 1155c609719bSwdenk variables "serial#" (Board Serial Number) and 1156c609719bSwdenk "ethaddr" (Ethernet Address) to bb parameters that 1157c609719bSwdenk are set once by the board vendor / manufacturer, and 1158c609719bSwdenk protects these variables from casual modification by 1159c609719bSwdenk the user. Once set, these variables are read-only, 1160c609719bSwdenk and write or delete attempts are rejected. You can 1161c609719bSwdenk change this behviour: 1162c609719bSwdenk 1163c609719bSwdenk If CONFIG_ENV_OVERWRITE is #defined in your config 1164c609719bSwdenk file, the write protection for vendor parameters is 116547cd00faSwdenk completely disabled. Anybody can change or delete 1166c609719bSwdenk these parameters. 1167c609719bSwdenk 1168c609719bSwdenk Alternatively, if you #define _both_ CONFIG_ETHADDR 1169c609719bSwdenk _and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default 1170c609719bSwdenk ethernet address is installed in the environment, 1171c609719bSwdenk which can be changed exactly ONCE by the user. [The 1172c609719bSwdenk serial# is unaffected by this, i. e. it remains 1173c609719bSwdenk read-only.] 1174c609719bSwdenk 1175c609719bSwdenk- Protected RAM: 1176c609719bSwdenk CONFIG_PRAM 1177c609719bSwdenk 1178c609719bSwdenk Define this variable to enable the reservation of 1179c609719bSwdenk "protected RAM", i. e. RAM which is not overwritten 1180c609719bSwdenk by U-Boot. Define CONFIG_PRAM to hold the number of 1181c609719bSwdenk kB you want to reserve for pRAM. You can overwrite 1182c609719bSwdenk this default value by defining an environment 1183c609719bSwdenk variable "pram" to the number of kB you want to 1184c609719bSwdenk reserve. Note that the board info structure will 1185c609719bSwdenk still show the full amount of RAM. If pRAM is 1186c609719bSwdenk reserved, a new environment variable "mem" will 1187c609719bSwdenk automatically be defined to hold the amount of 1188c609719bSwdenk remaining RAM in a form that can be passed as boot 1189c609719bSwdenk argument to Linux, for instance like that: 1190c609719bSwdenk 1191c609719bSwdenk setenv bootargs ... mem=\$(mem) 1192c609719bSwdenk saveenv 1193c609719bSwdenk 1194c609719bSwdenk This way you can tell Linux not to use this memory, 1195c609719bSwdenk either, which results in a memory region that will 1196c609719bSwdenk not be affected by reboots. 1197c609719bSwdenk 1198c609719bSwdenk *WARNING* If your board configuration uses automatic 1199c609719bSwdenk detection of the RAM size, you must make sure that 1200c609719bSwdenk this memory test is non-destructive. So far, the 1201c609719bSwdenk following board configurations are known to be 1202c609719bSwdenk "pRAM-clean": 1203c609719bSwdenk 1204c609719bSwdenk ETX094, IVMS8, IVML24, SPD8xx, TQM8xxL, 1205c609719bSwdenk HERMES, IP860, RPXlite, LWMON, LANTEC, 1206c609719bSwdenk PCU_E, FLAGADM, TQM8260 1207c609719bSwdenk 1208c609719bSwdenk- Error Recovery: 1209c609719bSwdenk CONFIG_PANIC_HANG 1210c609719bSwdenk 1211c609719bSwdenk Define this variable to stop the system in case of a 1212c609719bSwdenk fatal error, so that you have to reset it manually. 1213c609719bSwdenk This is probably NOT a good idea for an embedded 1214c609719bSwdenk system where you want to system to reboot 1215c609719bSwdenk automatically as fast as possible, but it may be 1216c609719bSwdenk useful during development since you can try to debug 1217c609719bSwdenk the conditions that lead to the situation. 1218c609719bSwdenk 1219c609719bSwdenk CONFIG_NET_RETRY_COUNT 1220c609719bSwdenk 1221c609719bSwdenk This variable defines the number of retries for 1222c609719bSwdenk network operations like ARP, RARP, TFTP, or BOOTP 1223c609719bSwdenk before giving up the operation. If not defined, a 1224c609719bSwdenk default value of 5 is used. 1225c609719bSwdenk 1226c609719bSwdenk- Command Interpreter: 1227c609719bSwdenk CFG_HUSH_PARSER 1228c609719bSwdenk 1229c609719bSwdenk Define this variable to enable the "hush" shell (from 1230c609719bSwdenk Busybox) as command line interpreter, thus enabling 1231c609719bSwdenk powerful command line syntax like 1232c609719bSwdenk if...then...else...fi conditionals or `&&' and '||' 1233c609719bSwdenk constructs ("shell scripts"). 1234c609719bSwdenk 1235c609719bSwdenk If undefined, you get the old, much simpler behaviour 1236c609719bSwdenk with a somewhat smaller memory footprint. 1237c609719bSwdenk 1238c609719bSwdenk 1239c609719bSwdenk CFG_PROMPT_HUSH_PS2 1240c609719bSwdenk 1241c609719bSwdenk This defines the secondary prompt string, which is 1242c609719bSwdenk printed when the command interpreter needs more input 1243c609719bSwdenk to complete a command. Usually "> ". 1244c609719bSwdenk 1245c609719bSwdenk Note: 1246c609719bSwdenk 1247c609719bSwdenk In the current implementation, the local variables 1248c609719bSwdenk space and global environment variables space are 1249c609719bSwdenk separated. Local variables are those you define by 12503b57fe0aSwdenk simply typing `name=value'. To access a local 1251c609719bSwdenk variable later on, you have write `$name' or 12523b57fe0aSwdenk `${name}'; to execute the contents of a variable 12533b57fe0aSwdenk directly type `$name' at the command prompt. 1254c609719bSwdenk 1255c609719bSwdenk Global environment variables are those you use 1256c609719bSwdenk setenv/printenv to work with. To run a command stored 1257c609719bSwdenk in such a variable, you need to use the run command, 1258c609719bSwdenk and you must not use the '$' sign to access them. 1259c609719bSwdenk 1260c609719bSwdenk To store commands and special characters in a 1261c609719bSwdenk variable, please use double quotation marks 1262c609719bSwdenk surrounding the whole text of the variable, instead 1263c609719bSwdenk of the backslashes before semicolons and special 1264c609719bSwdenk symbols. 1265c609719bSwdenk 1266c609719bSwdenk- Default Environment 1267c609719bSwdenk CONFIG_EXTRA_ENV_SETTINGS 1268c609719bSwdenk 1269c609719bSwdenk Define this to contain any number of null terminated 1270c609719bSwdenk strings (variable = value pairs) that will be part of 1271c609719bSwdenk the default enviroment compiled into the boot image. 12722262cfeeSwdenk 1273c609719bSwdenk For example, place something like this in your 1274c609719bSwdenk board's config file: 1275c609719bSwdenk 1276c609719bSwdenk #define CONFIG_EXTRA_ENV_SETTINGS \ 1277c609719bSwdenk "myvar1=value1\0" \ 1278c609719bSwdenk "myvar2=value2\0" 1279c609719bSwdenk 1280c609719bSwdenk Warning: This method is based on knowledge about the 1281c609719bSwdenk internal format how the environment is stored by the 12822262cfeeSwdenk U-Boot code. This is NOT an official, exported 1283c609719bSwdenk interface! Although it is unlikely that this format 12842262cfeeSwdenk will change soon, but there is no guarantee either. 1285c609719bSwdenk You better know what you are doing here. 1286c609719bSwdenk 1287c609719bSwdenk Note: overly (ab)use of the default environment is 1288c609719bSwdenk discouraged. Make sure to check other ways to preset 1289c609719bSwdenk the environment like the autoscript function or the 1290c609719bSwdenk boot command first. 1291c609719bSwdenk 12922abbe075Swdenk- DataFlash Support 12932abbe075Swdenk CONFIG_HAS_DATAFLASH 12942abbe075Swdenk 12952abbe075Swdenk Defining this option enables DataFlash features and 12962abbe075Swdenk allows to read/write in Dataflash via the standard 12972abbe075Swdenk commands cp, md... 12982abbe075Swdenk 1299c609719bSwdenk- Show boot progress 1300c609719bSwdenk CONFIG_SHOW_BOOT_PROGRESS 1301c609719bSwdenk 1302c609719bSwdenk Defining this option allows to add some board- 1303c609719bSwdenk specific code (calling a user-provided function 1304c609719bSwdenk "show_boot_progress(int)") that enables you to show 1305c609719bSwdenk the system's boot progress on some display (for 1306c609719bSwdenk example, some LED's) on your board. At the moment, 1307c609719bSwdenk the following checkpoints are implemented: 1308c609719bSwdenk 1309c609719bSwdenk Arg Where When 1310c609719bSwdenk 1 common/cmd_bootm.c before attempting to boot an image 1311c609719bSwdenk -1 common/cmd_bootm.c Image header has bad magic number 1312c609719bSwdenk 2 common/cmd_bootm.c Image header has correct magic number 1313c609719bSwdenk -2 common/cmd_bootm.c Image header has bad checksum 1314c609719bSwdenk 3 common/cmd_bootm.c Image header has correct checksum 1315c609719bSwdenk -3 common/cmd_bootm.c Image data has bad checksum 1316c609719bSwdenk 4 common/cmd_bootm.c Image data has correct checksum 1317c609719bSwdenk -4 common/cmd_bootm.c Image is for unsupported architecture 1318c609719bSwdenk 5 common/cmd_bootm.c Architecture check OK 1319c609719bSwdenk -5 common/cmd_bootm.c Wrong Image Type (not kernel, multi, standalone) 1320c609719bSwdenk 6 common/cmd_bootm.c Image Type check OK 1321c609719bSwdenk -6 common/cmd_bootm.c gunzip uncompression error 1322c609719bSwdenk -7 common/cmd_bootm.c Unimplemented compression type 1323c609719bSwdenk 7 common/cmd_bootm.c Uncompression OK 1324c609719bSwdenk -8 common/cmd_bootm.c Wrong Image Type (not kernel, multi, standalone) 1325c609719bSwdenk 8 common/cmd_bootm.c Image Type check OK 1326c609719bSwdenk -9 common/cmd_bootm.c Unsupported OS (not Linux, BSD, VxWorks, QNX) 1327c609719bSwdenk 9 common/cmd_bootm.c Start initial ramdisk verification 1328c609719bSwdenk -10 common/cmd_bootm.c Ramdisk header has bad magic number 1329c609719bSwdenk -11 common/cmd_bootm.c Ramdisk header has bad checksum 1330c609719bSwdenk 10 common/cmd_bootm.c Ramdisk header is OK 1331c609719bSwdenk -12 common/cmd_bootm.c Ramdisk data has bad checksum 1332c609719bSwdenk 11 common/cmd_bootm.c Ramdisk data has correct checksum 1333c609719bSwdenk 12 common/cmd_bootm.c Ramdisk verification complete, start loading 1334c609719bSwdenk -13 common/cmd_bootm.c Wrong Image Type (not PPC Linux Ramdisk) 1335c609719bSwdenk 13 common/cmd_bootm.c Start multifile image verification 1336c609719bSwdenk 14 common/cmd_bootm.c No initial ramdisk, no multifile, continue. 1337c609719bSwdenk 15 common/cmd_bootm.c All preparation done, transferring control to OS 1338c609719bSwdenk 1339c609719bSwdenk -1 common/cmd_doc.c Bad usage of "doc" command 1340c609719bSwdenk -1 common/cmd_doc.c No boot device 1341c609719bSwdenk -1 common/cmd_doc.c Unknown Chip ID on boot device 1342c609719bSwdenk -1 common/cmd_doc.c Read Error on boot device 1343c609719bSwdenk -1 common/cmd_doc.c Image header has bad magic number 1344c609719bSwdenk 1345c609719bSwdenk -1 common/cmd_ide.c Bad usage of "ide" command 1346c609719bSwdenk -1 common/cmd_ide.c No boot device 1347c609719bSwdenk -1 common/cmd_ide.c Unknown boot device 1348c609719bSwdenk -1 common/cmd_ide.c Unknown partition table 1349c609719bSwdenk -1 common/cmd_ide.c Invalid partition type 1350c609719bSwdenk -1 common/cmd_ide.c Read Error on boot device 1351c609719bSwdenk -1 common/cmd_ide.c Image header has bad magic number 1352c609719bSwdenk 1353c609719bSwdenk -1 common/cmd_nvedit.c Environment not changable, but has bad CRC 1354c609719bSwdenk 1355c609719bSwdenk 1356c609719bSwdenkModem Support: 1357c609719bSwdenk-------------- 1358c609719bSwdenk 135985ec0bccSwdenk[so far only for SMDK2400 and TRAB boards] 1360c609719bSwdenk 1361c609719bSwdenk- Modem support endable: 1362c609719bSwdenk CONFIG_MODEM_SUPPORT 1363c609719bSwdenk 1364c609719bSwdenk- RTS/CTS Flow control enable: 1365c609719bSwdenk CONFIG_HWFLOW 1366c609719bSwdenk 1367c609719bSwdenk- Modem debug support: 1368c609719bSwdenk CONFIG_MODEM_SUPPORT_DEBUG 1369c609719bSwdenk 1370c609719bSwdenk Enables debugging stuff (char screen[1024], dbg()) 1371c609719bSwdenk for modem support. Useful only with BDI2000. 1372c609719bSwdenk 1373c609719bSwdenk- General: 1374c609719bSwdenk 1375c609719bSwdenk In the target system modem support is enabled when a 1376c609719bSwdenk specific key (key combination) is pressed during 1377c609719bSwdenk power-on. Otherwise U-Boot will boot normally 1378c609719bSwdenk (autoboot). The key_pressed() fuction is called from 1379c609719bSwdenk board_init(). Currently key_pressed() is a dummy 1380c609719bSwdenk function, returning 1 and thus enabling modem 1381c609719bSwdenk initialization. 1382c609719bSwdenk 1383c609719bSwdenk If there are no modem init strings in the 1384c609719bSwdenk environment, U-Boot proceed to autoboot; the 1385c609719bSwdenk previous output (banner, info printfs) will be 1386c609719bSwdenk supressed, though. 1387c609719bSwdenk 1388c609719bSwdenk See also: doc/README.Modem 1389c609719bSwdenk 1390c609719bSwdenk 1391c609719bSwdenkConfiguration Settings: 1392c609719bSwdenk----------------------- 1393c609719bSwdenk 1394c609719bSwdenk- CFG_LONGHELP: Defined when you want long help messages included; 1395c609719bSwdenk undefine this when you're short of memory. 1396c609719bSwdenk 1397c609719bSwdenk- CFG_PROMPT: This is what U-Boot prints on the console to 1398c609719bSwdenk prompt for user input. 1399c609719bSwdenk 1400c609719bSwdenk- CFG_CBSIZE: Buffer size for input from the Console 1401c609719bSwdenk 1402c609719bSwdenk- CFG_PBSIZE: Buffer size for Console output 1403c609719bSwdenk 1404c609719bSwdenk- CFG_MAXARGS: max. Number of arguments accepted for monitor commands 1405c609719bSwdenk 1406c609719bSwdenk- CFG_BARGSIZE: Buffer size for Boot Arguments which are passed to 1407c609719bSwdenk the application (usually a Linux kernel) when it is 1408c609719bSwdenk booted 1409c609719bSwdenk 1410c609719bSwdenk- CFG_BAUDRATE_TABLE: 1411c609719bSwdenk List of legal baudrate settings for this board. 1412c609719bSwdenk 1413c609719bSwdenk- CFG_CONSOLE_INFO_QUIET 1414c609719bSwdenk Suppress display of console information at boot. 1415c609719bSwdenk 1416c609719bSwdenk- CFG_CONSOLE_IS_IN_ENV 1417c609719bSwdenk If the board specific function 1418c609719bSwdenk extern int overwrite_console (void); 1419c609719bSwdenk returns 1, the stdin, stderr and stdout are switched to the 1420c609719bSwdenk serial port, else the settings in the environment are used. 1421c609719bSwdenk 1422c609719bSwdenk- CFG_CONSOLE_OVERWRITE_ROUTINE 1423c609719bSwdenk Enable the call to overwrite_console(). 1424c609719bSwdenk 1425c609719bSwdenk- CFG_CONSOLE_ENV_OVERWRITE 1426c609719bSwdenk Enable overwrite of previous console environment settings. 1427c609719bSwdenk 1428c609719bSwdenk- CFG_MEMTEST_START, CFG_MEMTEST_END: 1429c609719bSwdenk Begin and End addresses of the area used by the 1430c609719bSwdenk simple memory test. 1431c609719bSwdenk 1432c609719bSwdenk- CFG_ALT_MEMTEST: 1433c609719bSwdenk Enable an alternate, more extensive memory test. 1434c609719bSwdenk 1435c609719bSwdenk- CFG_TFTP_LOADADDR: 1436c609719bSwdenk Default load address for network file downloads 1437c609719bSwdenk 1438c609719bSwdenk- CFG_LOADS_BAUD_CHANGE: 1439c609719bSwdenk Enable temporary baudrate change while serial download 1440c609719bSwdenk 1441c609719bSwdenk- CFG_SDRAM_BASE: 1442c609719bSwdenk Physical start address of SDRAM. _Must_ be 0 here. 1443c609719bSwdenk 1444c609719bSwdenk- CFG_MBIO_BASE: 1445c609719bSwdenk Physical start address of Motherboard I/O (if using a 1446c609719bSwdenk Cogent motherboard) 1447c609719bSwdenk 1448c609719bSwdenk- CFG_FLASH_BASE: 1449c609719bSwdenk Physical start address of Flash memory. 1450c609719bSwdenk 1451c609719bSwdenk- CFG_MONITOR_BASE: 1452c609719bSwdenk Physical start address of boot monitor code (set by 1453c609719bSwdenk make config files to be same as the text base address 1454c609719bSwdenk (TEXT_BASE) used when linking) - same as 1455c609719bSwdenk CFG_FLASH_BASE when booting from flash. 1456c609719bSwdenk 1457c609719bSwdenk- CFG_MONITOR_LEN: 14583b57fe0aSwdenk Size of memory reserved for monitor code, used to 14593b57fe0aSwdenk determine _at_compile_time_ (!) if the environment is 14603b57fe0aSwdenk embedded within the U-Boot image, or in a separate 14613b57fe0aSwdenk flash sector. 1462c609719bSwdenk 1463c609719bSwdenk- CFG_MALLOC_LEN: 1464c609719bSwdenk Size of DRAM reserved for malloc() use. 1465c609719bSwdenk 1466c609719bSwdenk- CFG_BOOTMAPSZ: 1467c609719bSwdenk Maximum size of memory mapped by the startup code of 1468c609719bSwdenk the Linux kernel; all data that must be processed by 1469c609719bSwdenk the Linux kernel (bd_info, boot arguments, eventually 1470c609719bSwdenk initrd image) must be put below this limit. 1471c609719bSwdenk 1472c609719bSwdenk- CFG_MAX_FLASH_BANKS: 1473c609719bSwdenk Max number of Flash memory banks 1474c609719bSwdenk 1475c609719bSwdenk- CFG_MAX_FLASH_SECT: 1476c609719bSwdenk Max number of sectors on a Flash chip 1477c609719bSwdenk 1478c609719bSwdenk- CFG_FLASH_ERASE_TOUT: 1479c609719bSwdenk Timeout for Flash erase operations (in ms) 1480c609719bSwdenk 1481c609719bSwdenk- CFG_FLASH_WRITE_TOUT: 1482c609719bSwdenk Timeout for Flash write operations (in ms) 1483c609719bSwdenk 14848564acf9Swdenk- CFG_FLASH_LOCK_TOUT 14858564acf9Swdenk Timeout for Flash set sector lock bit operation (in ms) 14868564acf9Swdenk 14878564acf9Swdenk- CFG_FLASH_UNLOCK_TOUT 14888564acf9Swdenk Timeout for Flash clear lock bits operation (in ms) 14898564acf9Swdenk 14908564acf9Swdenk- CFG_FLASH_PROTECTION 14918564acf9Swdenk If defined, hardware flash sectors protection is used 14928564acf9Swdenk instead of U-Boot software protection. 14938564acf9Swdenk 1494c609719bSwdenk- CFG_DIRECT_FLASH_TFTP: 1495c609719bSwdenk 1496c609719bSwdenk Enable TFTP transfers directly to flash memory; 1497c609719bSwdenk without this option such a download has to be 1498c609719bSwdenk performed in two steps: (1) download to RAM, and (2) 1499c609719bSwdenk copy from RAM to flash. 1500c609719bSwdenk 1501c609719bSwdenk The two-step approach is usually more reliable, since 1502c609719bSwdenk you can check if the download worked before you erase 1503c609719bSwdenk the flash, but in some situations (when sytem RAM is 1504c609719bSwdenk too limited to allow for a tempory copy of the 1505c609719bSwdenk downloaded image) this option may be very useful. 1506c609719bSwdenk 1507c609719bSwdenk- CFG_FLASH_CFI: 1508c609719bSwdenk Define if the flash driver uses extra elements in the 1509c609719bSwdenk common flash structure for storing flash geometry 151053cf9435Sstroese 151153cf9435Sstroese- CFG_RX_ETH_BUFFER: 151253cf9435Sstroese Defines the number of ethernet receive buffers. On some 151353cf9435Sstroese ethernet controllers it is recommended to set this value 151453cf9435Sstroese to 8 or even higher (EEPRO100 or 405 EMAC), since all 151553cf9435Sstroese buffers can be full shortly after enabling the interface 151653cf9435Sstroese on high ethernet traffic. 151753cf9435Sstroese Defaults to 4 if not defined. 1518c609719bSwdenk 1519c609719bSwdenkThe following definitions that deal with the placement and management 1520c609719bSwdenkof environment data (variable area); in general, we support the 1521c609719bSwdenkfollowing configurations: 1522c609719bSwdenk 1523c609719bSwdenk- CFG_ENV_IS_IN_FLASH: 1524c609719bSwdenk 1525c609719bSwdenk Define this if the environment is in flash memory. 1526c609719bSwdenk 1527c609719bSwdenk a) The environment occupies one whole flash sector, which is 1528c609719bSwdenk "embedded" in the text segment with the U-Boot code. This 1529c609719bSwdenk happens usually with "bottom boot sector" or "top boot 1530c609719bSwdenk sector" type flash chips, which have several smaller 1531c609719bSwdenk sectors at the start or the end. For instance, such a 1532c609719bSwdenk layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In 1533c609719bSwdenk such a case you would place the environment in one of the 1534c609719bSwdenk 4 kB sectors - with U-Boot code before and after it. With 1535c609719bSwdenk "top boot sector" type flash chips, you would put the 1536c609719bSwdenk environment in one of the last sectors, leaving a gap 1537c609719bSwdenk between U-Boot and the environment. 1538c609719bSwdenk 1539c609719bSwdenk - CFG_ENV_OFFSET: 1540c609719bSwdenk 1541c609719bSwdenk Offset of environment data (variable area) to the 1542c609719bSwdenk beginning of flash memory; for instance, with bottom boot 1543c609719bSwdenk type flash chips the second sector can be used: the offset 1544c609719bSwdenk for this sector is given here. 1545c609719bSwdenk 1546c609719bSwdenk CFG_ENV_OFFSET is used relative to CFG_FLASH_BASE. 1547c609719bSwdenk 1548c609719bSwdenk - CFG_ENV_ADDR: 1549c609719bSwdenk 1550c609719bSwdenk This is just another way to specify the start address of 1551c609719bSwdenk the flash sector containing the environment (instead of 1552c609719bSwdenk CFG_ENV_OFFSET). 1553c609719bSwdenk 1554c609719bSwdenk - CFG_ENV_SECT_SIZE: 1555c609719bSwdenk 1556c609719bSwdenk Size of the sector containing the environment. 1557c609719bSwdenk 1558c609719bSwdenk 1559c609719bSwdenk b) Sometimes flash chips have few, equal sized, BIG sectors. 1560c609719bSwdenk In such a case you don't want to spend a whole sector for 1561c609719bSwdenk the environment. 1562c609719bSwdenk 1563c609719bSwdenk - CFG_ENV_SIZE: 1564c609719bSwdenk 1565c609719bSwdenk If you use this in combination with CFG_ENV_IS_IN_FLASH 1566c609719bSwdenk and CFG_ENV_SECT_SIZE, you can specify to use only a part 1567c609719bSwdenk of this flash sector for the environment. This saves 1568c609719bSwdenk memory for the RAM copy of the environment. 1569c609719bSwdenk 1570c609719bSwdenk It may also save flash memory if you decide to use this 1571c609719bSwdenk when your environment is "embedded" within U-Boot code, 1572c609719bSwdenk since then the remainder of the flash sector could be used 1573c609719bSwdenk for U-Boot code. It should be pointed out that this is 1574c609719bSwdenk STRONGLY DISCOURAGED from a robustness point of view: 1575c609719bSwdenk updating the environment in flash makes it always 1576c609719bSwdenk necessary to erase the WHOLE sector. If something goes 1577c609719bSwdenk wrong before the contents has been restored from a copy in 1578c609719bSwdenk RAM, your target system will be dead. 1579c609719bSwdenk 1580c609719bSwdenk - CFG_ENV_ADDR_REDUND 1581c609719bSwdenk CFG_ENV_SIZE_REDUND 1582c609719bSwdenk 1583c609719bSwdenk These settings describe a second storage area used to hold 1584c609719bSwdenk a redundand copy of the environment data, so that there is 15853e38691eSwdenk a valid backup copy in case there is a power failure during 1586c609719bSwdenk a "saveenv" operation. 1587c609719bSwdenk 1588c609719bSwdenkBE CAREFUL! Any changes to the flash layout, and some changes to the 1589c609719bSwdenksource code will make it necessary to adapt <board>/u-boot.lds* 1590c609719bSwdenkaccordingly! 1591c609719bSwdenk 1592c609719bSwdenk 1593c609719bSwdenk- CFG_ENV_IS_IN_NVRAM: 1594c609719bSwdenk 1595c609719bSwdenk Define this if you have some non-volatile memory device 1596c609719bSwdenk (NVRAM, battery buffered SRAM) which you want to use for the 1597c609719bSwdenk environment. 1598c609719bSwdenk 1599c609719bSwdenk - CFG_ENV_ADDR: 1600c609719bSwdenk - CFG_ENV_SIZE: 1601c609719bSwdenk 1602c609719bSwdenk These two #defines are used to determin the memory area you 1603c609719bSwdenk want to use for environment. It is assumed that this memory 1604c609719bSwdenk can just be read and written to, without any special 1605c609719bSwdenk provision. 1606c609719bSwdenk 1607c609719bSwdenkBE CAREFUL! The first access to the environment happens quite early 1608c609719bSwdenkin U-Boot initalization (when we try to get the setting of for the 1609c609719bSwdenkconsole baudrate). You *MUST* have mappend your NVRAM area then, or 1610c609719bSwdenkU-Boot will hang. 1611c609719bSwdenk 1612c609719bSwdenkPlease note that even with NVRAM we still use a copy of the 1613c609719bSwdenkenvironment in RAM: we could work on NVRAM directly, but we want to 1614c609719bSwdenkkeep settings there always unmodified except somebody uses "saveenv" 1615c609719bSwdenkto save the current settings. 1616c609719bSwdenk 1617c609719bSwdenk 1618c609719bSwdenk- CFG_ENV_IS_IN_EEPROM: 1619c609719bSwdenk 1620c609719bSwdenk Use this if you have an EEPROM or similar serial access 1621c609719bSwdenk device and a driver for it. 1622c609719bSwdenk 1623c609719bSwdenk - CFG_ENV_OFFSET: 1624c609719bSwdenk - CFG_ENV_SIZE: 1625c609719bSwdenk 1626c609719bSwdenk These two #defines specify the offset and size of the 1627c609719bSwdenk environment area within the total memory of your EEPROM. 1628c609719bSwdenk 1629c609719bSwdenk - CFG_I2C_EEPROM_ADDR: 1630c609719bSwdenk If defined, specified the chip address of the EEPROM device. 1631c609719bSwdenk The default address is zero. 1632c609719bSwdenk 1633c609719bSwdenk - CFG_EEPROM_PAGE_WRITE_BITS: 1634c609719bSwdenk If defined, the number of bits used to address bytes in a 1635c609719bSwdenk single page in the EEPROM device. A 64 byte page, for example 1636c609719bSwdenk would require six bits. 1637c609719bSwdenk 1638c609719bSwdenk - CFG_EEPROM_PAGE_WRITE_DELAY_MS: 1639c609719bSwdenk If defined, the number of milliseconds to delay between 1640c609719bSwdenk page writes. The default is zero milliseconds. 1641c609719bSwdenk 1642c609719bSwdenk - CFG_I2C_EEPROM_ADDR_LEN: 1643c609719bSwdenk The length in bytes of the EEPROM memory array address. Note 1644c609719bSwdenk that this is NOT the chip address length! 1645c609719bSwdenk 1646c609719bSwdenk - CFG_EEPROM_SIZE: 1647c609719bSwdenk The size in bytes of the EEPROM device. 1648c609719bSwdenk 1649c609719bSwdenk 1650c609719bSwdenk- CFG_SPI_INIT_OFFSET 1651c609719bSwdenk 1652c609719bSwdenk Defines offset to the initial SPI buffer area in DPRAM. The 1653c609719bSwdenk area is used at an early stage (ROM part) if the environment 1654c609719bSwdenk is configured to reside in the SPI EEPROM: We need a 520 byte 1655c609719bSwdenk scratch DPRAM area. It is used between the two initialization 1656c609719bSwdenk calls (spi_init_f() and spi_init_r()). A value of 0xB00 seems 1657c609719bSwdenk to be a good choice since it makes it far enough from the 1658c609719bSwdenk start of the data area as well as from the stack pointer. 1659c609719bSwdenk 1660c609719bSwdenkPlease note that the environment is read-only as long as the monitor 1661c609719bSwdenkhas been relocated to RAM and a RAM copy of the environment has been 1662c609719bSwdenkcreated; also, when using EEPROM you will have to use getenv_r() 1663c609719bSwdenkuntil then to read environment variables. 1664c609719bSwdenk 166585ec0bccSwdenkThe environment is protected by a CRC32 checksum. Before the monitor 166685ec0bccSwdenkis relocated into RAM, as a result of a bad CRC you will be working 166785ec0bccSwdenkwith the compiled-in default environment - *silently*!!! [This is 166885ec0bccSwdenknecessary, because the first environment variable we need is the 166985ec0bccSwdenk"baudrate" setting for the console - if we have a bad CRC, we don't 167085ec0bccSwdenkhave any device yet where we could complain.] 1671c609719bSwdenk 1672c609719bSwdenkNote: once the monitor has been relocated, then it will complain if 1673c609719bSwdenkthe default environment is used; a new CRC is computed as soon as you 167485ec0bccSwdenkuse the "saveenv" command to store a valid environment. 1675c609719bSwdenk 1676c609719bSwdenk 1677c609719bSwdenkLow Level (hardware related) configuration options: 1678dc7c9a1aSwdenk--------------------------------------------------- 1679c609719bSwdenk 1680c609719bSwdenk- CFG_CACHELINE_SIZE: 1681c609719bSwdenk Cache Line Size of the CPU. 1682c609719bSwdenk 1683c609719bSwdenk- CFG_DEFAULT_IMMR: 1684c609719bSwdenk Default address of the IMMR after system reset. 1685c609719bSwdenk Needed on some 8260 systems (MPC8260ADS and RPXsuper) 1686c609719bSwdenk to be able to adjust the position of the IMMR 1687c609719bSwdenk register after a reset. 1688c609719bSwdenk 16897f6c2cbcSwdenk- Floppy Disk Support: 16907f6c2cbcSwdenk CFG_FDC_DRIVE_NUMBER 16917f6c2cbcSwdenk 16927f6c2cbcSwdenk the default drive number (default value 0) 16937f6c2cbcSwdenk 16947f6c2cbcSwdenk CFG_ISA_IO_STRIDE 16957f6c2cbcSwdenk 16967f6c2cbcSwdenk defines the spacing between fdc chipset registers 16977f6c2cbcSwdenk (default value 1) 16987f6c2cbcSwdenk 16997f6c2cbcSwdenk CFG_ISA_IO_OFFSET 17007f6c2cbcSwdenk 17017f6c2cbcSwdenk defines the offset of register from address. It 17027f6c2cbcSwdenk depends on which part of the data bus is connected to 17037f6c2cbcSwdenk the fdc chipset. (default value 0) 17047f6c2cbcSwdenk 17057f6c2cbcSwdenk If CFG_ISA_IO_STRIDE CFG_ISA_IO_OFFSET and 17067f6c2cbcSwdenk CFG_FDC_DRIVE_NUMBER are undefined, they take their 17077f6c2cbcSwdenk default value. 17087f6c2cbcSwdenk 17097f6c2cbcSwdenk if CFG_FDC_HW_INIT is defined, then the function 17107f6c2cbcSwdenk fdc_hw_init() is called at the beginning of the FDC 17117f6c2cbcSwdenk setup. fdc_hw_init() must be provided by the board 17127f6c2cbcSwdenk source code. It is used to make hardware dependant 17137f6c2cbcSwdenk initializations. 17147f6c2cbcSwdenk 1715c609719bSwdenk- CFG_IMMR: Physical address of the Internal Memory Mapped 1716c609719bSwdenk Register; DO NOT CHANGE! (11-4) 1717c609719bSwdenk [MPC8xx systems only] 1718c609719bSwdenk 1719c609719bSwdenk- CFG_INIT_RAM_ADDR: 1720c609719bSwdenk 1721c609719bSwdenk Start address of memory area tha can be used for 1722c609719bSwdenk initial data and stack; please note that this must be 1723c609719bSwdenk writable memory that is working WITHOUT special 1724c609719bSwdenk initialization, i. e. you CANNOT use normal RAM which 1725c609719bSwdenk will become available only after programming the 1726c609719bSwdenk memory controller and running certain initialization 1727c609719bSwdenk sequences. 1728c609719bSwdenk 1729c609719bSwdenk U-Boot uses the following memory types: 1730c609719bSwdenk - MPC8xx and MPC8260: IMMR (internal memory of the CPU) 1731c609719bSwdenk - MPC824X: data cache 1732c609719bSwdenk - PPC4xx: data cache 1733c609719bSwdenk 173485ec0bccSwdenk- CFG_GBL_DATA_OFFSET: 1735c609719bSwdenk 1736c609719bSwdenk Offset of the initial data structure in the memory 1737c609719bSwdenk area defined by CFG_INIT_RAM_ADDR. Usually 173885ec0bccSwdenk CFG_GBL_DATA_OFFSET is chosen such that the initial 1739c609719bSwdenk data is located at the end of the available space 1740c609719bSwdenk (sometimes written as (CFG_INIT_RAM_END - 1741c609719bSwdenk CFG_INIT_DATA_SIZE), and the initial stack is just 1742c609719bSwdenk below that area (growing from (CFG_INIT_RAM_ADDR + 174385ec0bccSwdenk CFG_GBL_DATA_OFFSET) downward. 1744c609719bSwdenk 1745c609719bSwdenk Note: 1746c609719bSwdenk On the MPC824X (or other systems that use the data 1747c609719bSwdenk cache for initial memory) the address chosen for 1748c609719bSwdenk CFG_INIT_RAM_ADDR is basically arbitrary - it must 1749c609719bSwdenk point to an otherwise UNUSED address space between 1750c609719bSwdenk the top of RAM and the start of the PCI space. 1751c609719bSwdenk 1752c609719bSwdenk- CFG_SIUMCR: SIU Module Configuration (11-6) 1753c609719bSwdenk 1754c609719bSwdenk- CFG_SYPCR: System Protection Control (11-9) 1755c609719bSwdenk 1756c609719bSwdenk- CFG_TBSCR: Time Base Status and Control (11-26) 1757c609719bSwdenk 1758c609719bSwdenk- CFG_PISCR: Periodic Interrupt Status and Control (11-31) 1759c609719bSwdenk 1760c609719bSwdenk- CFG_PLPRCR: PLL, Low-Power, and Reset Control Register (15-30) 1761c609719bSwdenk 1762c609719bSwdenk- CFG_SCCR: System Clock and reset Control Register (15-27) 1763c609719bSwdenk 1764c609719bSwdenk- CFG_OR_TIMING_SDRAM: 1765c609719bSwdenk SDRAM timing 1766c609719bSwdenk 1767c609719bSwdenk- CFG_MAMR_PTA: 1768c609719bSwdenk periodic timer for refresh 1769c609719bSwdenk 1770c609719bSwdenk- CFG_DER: Debug Event Register (37-47) 1771c609719bSwdenk 1772c609719bSwdenk- FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CFG_REMAP_OR_AM, 1773c609719bSwdenk CFG_PRELIM_OR_AM, CFG_OR_TIMING_FLASH, CFG_OR0_REMAP, 1774c609719bSwdenk CFG_OR0_PRELIM, CFG_BR0_PRELIM, CFG_OR1_REMAP, CFG_OR1_PRELIM, 1775c609719bSwdenk CFG_BR1_PRELIM: 1776c609719bSwdenk Memory Controller Definitions: BR0/1 and OR0/1 (FLASH) 1777c609719bSwdenk 1778c609719bSwdenk- SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE, 1779c609719bSwdenk CFG_OR_TIMING_SDRAM, CFG_OR2_PRELIM, CFG_BR2_PRELIM, 1780c609719bSwdenk CFG_OR3_PRELIM, CFG_BR3_PRELIM: 1781c609719bSwdenk Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM) 1782c609719bSwdenk 1783c609719bSwdenk- CFG_MAMR_PTA, CFG_MPTPR_2BK_4K, CFG_MPTPR_1BK_4K, CFG_MPTPR_2BK_8K, 1784c609719bSwdenk CFG_MPTPR_1BK_8K, CFG_MAMR_8COL, CFG_MAMR_9COL: 1785c609719bSwdenk Machine Mode Register and Memory Periodic Timer 1786c609719bSwdenk Prescaler definitions (SDRAM timing) 1787c609719bSwdenk 1788c609719bSwdenk- CFG_I2C_UCODE_PATCH, CFG_I2C_DPMEM_OFFSET [0x1FC0]: 1789c609719bSwdenk enable I2C microcode relocation patch (MPC8xx); 1790c609719bSwdenk define relocation offset in DPRAM [DSP2] 1791c609719bSwdenk 1792c609719bSwdenk- CFG_SPI_UCODE_PATCH, CFG_SPI_DPMEM_OFFSET [0x1FC0]: 1793c609719bSwdenk enable SPI microcode relocation patch (MPC8xx); 1794c609719bSwdenk define relocation offset in DPRAM [SCC4] 1795c609719bSwdenk 1796c609719bSwdenk- CFG_USE_OSCCLK: 1797c609719bSwdenk Use OSCM clock mode on MBX8xx board. Be careful, 1798c609719bSwdenk wrong setting might damage your board. Read 1799c609719bSwdenk doc/README.MBX before setting this variable! 1800c609719bSwdenk 1801ea909b76Swdenk- CFG_CPM_POST_WORD_ADDR: (MPC8xx, MPC8260 only) 1802ea909b76Swdenk Offset of the bootmode word in DPRAM used by post 1803ea909b76Swdenk (Power On Self Tests). This definition overrides 1804ea909b76Swdenk #define'd default value in commproc.h resp. 1805ea909b76Swdenk cpm_8260.h. 1806ea909b76Swdenk 18075d232d0eSwdenk- CFG_PCI_SLV_MEM_LOCAL, CFG_PCI_SLV_MEM_BUS, CFG_PICMR0_MASK_ATTRIB, 18085d232d0eSwdenk CFG_PCI_MSTR0_LOCAL, CFG_PCIMSK0_MASK, CFG_PCI_MSTR1_LOCAL, 18095d232d0eSwdenk CFG_PCIMSK1_MASK, CFG_PCI_MSTR_MEM_LOCAL, CFG_PCI_MSTR_MEM_BUS, 18105d232d0eSwdenk CFG_CPU_PCI_MEM_START, CFG_PCI_MSTR_MEM_SIZE, CFG_POCMR0_MASK_ATTRIB, 18115d232d0eSwdenk CFG_PCI_MSTR_MEMIO_LOCAL, CFG_PCI_MSTR_MEMIO_BUS, CPU_PCI_MEMIO_START, 18125d232d0eSwdenk CFG_PCI_MSTR_MEMIO_SIZE, CFG_POCMR1_MASK_ATTRIB, CFG_PCI_MSTR_IO_LOCAL, 18135d232d0eSwdenk CFG_PCI_MSTR_IO_BUS, CFG_CPU_PCI_IO_START, CFG_PCI_MSTR_IO_SIZE, 18145d232d0eSwdenk CFG_POCMR2_MASK_ATTRIB: (MPC826x only) 18155d232d0eSwdenk Overrides the default PCI memory map in cpu/mpc8260/pci.c if set. 18165d232d0eSwdenk 1817c609719bSwdenkBuilding the Software: 1818c609719bSwdenk====================== 1819c609719bSwdenk 1820c609719bSwdenkBuilding U-Boot has been tested in native PPC environments (on a 1821c609719bSwdenkPowerBook G3 running LinuxPPC 2000) and in cross environments 1822c609719bSwdenk(running RedHat 6.x and 7.x Linux on x86, Solaris 2.6 on a SPARC, and 1823c609719bSwdenkNetBSD 1.5 on x86). 1824c609719bSwdenk 1825c609719bSwdenkIf you are not using a native PPC environment, it is assumed that you 1826c609719bSwdenkhave the GNU cross compiling tools available in your path and named 1827c609719bSwdenkwith a prefix of "powerpc-linux-". If this is not the case, (e.g. if 1828c609719bSwdenkyou are using Monta Vista's Hard Hat Linux CDK 1.2) you must change 1829c609719bSwdenkthe definition of CROSS_COMPILE in Makefile. For HHL on a 4xx CPU, 1830c609719bSwdenkchange it to: 1831c609719bSwdenk 1832c609719bSwdenk CROSS_COMPILE = ppc_4xx- 1833c609719bSwdenk 1834c609719bSwdenk 1835c609719bSwdenkU-Boot is intended to be simple to build. After installing the 1836c609719bSwdenksources you must configure U-Boot for one specific board type. This 1837c609719bSwdenkis done by typing: 1838c609719bSwdenk 1839c609719bSwdenk make NAME_config 1840c609719bSwdenk 1841c609719bSwdenkwhere "NAME_config" is the name of one of the existing 1842c609719bSwdenkconfigurations; the following names are supported: 1843c609719bSwdenk 1844c609719bSwdenk ADCIOP_config GTH_config TQM850L_config 1845c609719bSwdenk ADS860_config IP860_config TQM855L_config 1846c609719bSwdenk AR405_config IVML24_config TQM860L_config 1847c609719bSwdenk CANBT_config IVMS8_config WALNUT405_config 1848c609719bSwdenk CPCI405_config LANTEC_config cogent_common_config 1849c609719bSwdenk CPCIISER4_config MBX_config cogent_mpc8260_config 1850c609719bSwdenk CU824_config MBX860T_config cogent_mpc8xx_config 1851c609719bSwdenk ESTEEM192E_config RPXlite_config hermes_config 1852c609719bSwdenk ETX094_config RPXsuper_config hymod_config 1853c609719bSwdenk FADS823_config SM850_config lwmon_config 1854c609719bSwdenk FADS850SAR_config SPD823TS_config pcu_e_config 1855c609719bSwdenk FADS860T_config SXNI855T_config rsdproto_config 1856c609719bSwdenk FPS850L_config Sandpoint8240_config sbc8260_config 1857c609719bSwdenk GENIETV_config TQM823L_config PIP405_config 1858384ae025Swdenk GEN860T_config EBONY_config FPS860L_config 18597f70e853Swdenk ELPT860_config cmi_mpc5xx_config NETVIA_config 18602abbe075Swdenk at91rm9200dk_config 1861c609719bSwdenk 1862c609719bSwdenkNote: for some board special configuration names may exist; check if 1863c609719bSwdenk additional information is available from the board vendor; for 1864c609719bSwdenk instance, the TQM8xxL systems run normally at 50 MHz and use a 1865c609719bSwdenk SCC for 10baseT ethernet; there are also systems with 80 MHz 1866c609719bSwdenk CPU clock, and an optional Fast Ethernet module is available 1867c609719bSwdenk for CPU's with FEC. You can select such additional "features" 1868c609719bSwdenk when chosing the configuration, i. e. 1869c609719bSwdenk 1870c609719bSwdenk make TQM860L_config 1871c609719bSwdenk - will configure for a plain TQM860L, i. e. 50MHz, no FEC 1872c609719bSwdenk 1873c609719bSwdenk make TQM860L_FEC_config 1874c609719bSwdenk - will configure for a TQM860L at 50MHz with FEC for ethernet 1875c609719bSwdenk 1876c609719bSwdenk make TQM860L_80MHz_config 1877c609719bSwdenk - will configure for a TQM860L at 80 MHz, with normal 10baseT 1878c609719bSwdenk interface 1879c609719bSwdenk 1880c609719bSwdenk make TQM860L_FEC_80MHz_config 1881c609719bSwdenk - will configure for a TQM860L at 80 MHz with FEC for ethernet 1882c609719bSwdenk 1883c609719bSwdenk make TQM823L_LCD_config 1884c609719bSwdenk - will configure for a TQM823L with U-Boot console on LCD 1885c609719bSwdenk 1886c609719bSwdenk make TQM823L_LCD_80MHz_config 1887c609719bSwdenk - will configure for a TQM823L at 80 MHz with U-Boot console on LCD 1888c609719bSwdenk 1889c609719bSwdenk etc. 1890c609719bSwdenk 1891c609719bSwdenk 1892c609719bSwdenkFinally, type "make all", and you should get some working U-Boot 1893c609719bSwdenkimages ready for downlod to / installation on your system: 1894c609719bSwdenk 1895c609719bSwdenk- "u-boot.bin" is a raw binary image 1896c609719bSwdenk- "u-boot" is an image in ELF binary format 1897c609719bSwdenk- "u-boot.srec" is in Motorola S-Record format 1898c609719bSwdenk 1899c609719bSwdenk 1900c609719bSwdenkPlease be aware that the Makefiles assume you are using GNU make, so 1901c609719bSwdenkfor instance on NetBSD you might need to use "gmake" instead of 1902c609719bSwdenknative "make". 1903c609719bSwdenk 1904c609719bSwdenk 1905c609719bSwdenkIf the system board that you have is not listed, then you will need 1906c609719bSwdenkto port U-Boot to your hardware platform. To do this, follow these 1907c609719bSwdenksteps: 1908c609719bSwdenk 1909c609719bSwdenk1. Add a new configuration option for your board to the toplevel 191085ec0bccSwdenk "Makefile" and to the "MAKEALL" script, using the existing 191185ec0bccSwdenk entries as examples. Note that here and at many other places 191285ec0bccSwdenk boards and other names are listed alphabetically sorted. Please 191385ec0bccSwdenk keep this order. 1914c609719bSwdenk2. Create a new directory to hold your board specific code. Add any 191585ec0bccSwdenk files you need. In your board directory, you will need at least 191685ec0bccSwdenk the "Makefile", a "<board>.c", "flash.c" and "u-boot.lds". 191785ec0bccSwdenk3. Create a new configuration file "include/configs/<board>.h" for 191885ec0bccSwdenk your board 1919c609719bSwdenk3. If you're porting U-Boot to a new CPU, then also create a new 1920c609719bSwdenk directory to hold your CPU specific code. Add any files you need. 192185ec0bccSwdenk4. Run "make <board>_config" with your new name. 1922c609719bSwdenk5. Type "make", and you should get a working "u-boot.srec" file 1923c609719bSwdenk to be installed on your target system. 192485ec0bccSwdenk6. Debug and solve any problems that might arise. 1925c609719bSwdenk [Of course, this last step is much harder than it sounds.] 1926c609719bSwdenk 1927c609719bSwdenk 1928c609719bSwdenkTesting of U-Boot Modifications, Ports to New Hardware, etc.: 1929c609719bSwdenk============================================================== 1930c609719bSwdenk 1931c609719bSwdenkIf you have modified U-Boot sources (for instance added a new board 1932c609719bSwdenkor support for new devices, a new CPU, etc.) you are expected to 1933c609719bSwdenkprovide feedback to the other developers. The feedback normally takes 1934c609719bSwdenkthe form of a "patch", i. e. a context diff against a certain (latest 1935c609719bSwdenkofficial or latest in CVS) version of U-Boot sources. 1936c609719bSwdenk 1937c609719bSwdenkBut before you submit such a patch, please verify that your modifi- 1938c609719bSwdenkcation did not break existing code. At least make sure that *ALL* of 1939c609719bSwdenkthe supported boards compile WITHOUT ANY compiler warnings. To do so, 1940c609719bSwdenkjust run the "MAKEALL" script, which will configure and build U-Boot 1941c609719bSwdenkfor ALL supported system. Be warned, this will take a while. You can 1942c609719bSwdenkselect which (cross) compiler to use py passing a `CROSS_COMPILE' 1943c609719bSwdenkenvironment variable to the script, i. e. to use the cross tools from 1944c609719bSwdenkMontaVista's Hard Hat Linux you can type 1945c609719bSwdenk 1946c609719bSwdenk CROSS_COMPILE=ppc_8xx- MAKEALL 1947c609719bSwdenk 1948c609719bSwdenkor to build on a native PowerPC system you can type 1949c609719bSwdenk 1950c609719bSwdenk CROSS_COMPILE=' ' MAKEALL 1951c609719bSwdenk 1952c609719bSwdenkSee also "U-Boot Porting Guide" below. 1953c609719bSwdenk 1954c609719bSwdenk 1955c609719bSwdenkMonitor Commands - Overview: 1956c609719bSwdenk============================ 1957c609719bSwdenk 1958c609719bSwdenkgo - start application at address 'addr' 1959c609719bSwdenkrun - run commands in an environment variable 1960c609719bSwdenkbootm - boot application image from memory 1961c609719bSwdenkbootp - boot image via network using BootP/TFTP protocol 1962c609719bSwdenktftpboot- boot image via network using TFTP protocol 1963c609719bSwdenk and env variables "ipaddr" and "serverip" 1964c609719bSwdenk (and eventually "gatewayip") 1965c609719bSwdenkrarpboot- boot image via network using RARP/TFTP protocol 1966c609719bSwdenkdiskboot- boot from IDE devicebootd - boot default, i.e., run 'bootcmd' 1967c609719bSwdenkloads - load S-Record file over serial line 1968c609719bSwdenkloadb - load binary file over serial line (kermit mode) 1969c609719bSwdenkmd - memory display 1970c609719bSwdenkmm - memory modify (auto-incrementing) 1971c609719bSwdenknm - memory modify (constant address) 1972c609719bSwdenkmw - memory write (fill) 1973c609719bSwdenkcp - memory copy 1974c609719bSwdenkcmp - memory compare 1975c609719bSwdenkcrc32 - checksum calculation 1976c609719bSwdenkimd - i2c memory display 1977c609719bSwdenkimm - i2c memory modify (auto-incrementing) 1978c609719bSwdenkinm - i2c memory modify (constant address) 1979c609719bSwdenkimw - i2c memory write (fill) 1980c609719bSwdenkicrc32 - i2c checksum calculation 1981c609719bSwdenkiprobe - probe to discover valid I2C chip addresses 1982c609719bSwdenkiloop - infinite loop on address range 1983c609719bSwdenkisdram - print SDRAM configuration information 1984c609719bSwdenksspi - SPI utility commands 1985c609719bSwdenkbase - print or set address offset 1986c609719bSwdenkprintenv- print environment variables 1987c609719bSwdenksetenv - set environment variables 1988c609719bSwdenksaveenv - save environment variables to persistent storage 1989c609719bSwdenkprotect - enable or disable FLASH write protection 1990c609719bSwdenkerase - erase FLASH memory 1991c609719bSwdenkflinfo - print FLASH memory information 1992c609719bSwdenkbdinfo - print Board Info structure 1993c609719bSwdenkiminfo - print header information for application image 1994c609719bSwdenkconinfo - print console devices and informations 1995c609719bSwdenkide - IDE sub-system 1996c609719bSwdenkloop - infinite loop on address range 1997c609719bSwdenkmtest - simple RAM test 1998c609719bSwdenkicache - enable or disable instruction cache 1999c609719bSwdenkdcache - enable or disable data cache 2000c609719bSwdenkreset - Perform RESET of the CPU 2001c609719bSwdenkecho - echo args to console 2002c609719bSwdenkversion - print monitor version 2003c609719bSwdenkhelp - print online help 2004c609719bSwdenk? - alias for 'help' 2005c609719bSwdenk 2006c609719bSwdenk 2007c609719bSwdenkMonitor Commands - Detailed Description: 2008c609719bSwdenk======================================== 2009c609719bSwdenk 2010c609719bSwdenkTODO. 2011c609719bSwdenk 2012c609719bSwdenkFor now: just type "help <command>". 2013c609719bSwdenk 2014c609719bSwdenk 2015c609719bSwdenkEnvironment Variables: 2016c609719bSwdenk====================== 2017c609719bSwdenk 2018c609719bSwdenkU-Boot supports user configuration using Environment Variables which 2019c609719bSwdenkcan be made persistent by saving to Flash memory. 2020c609719bSwdenk 2021c609719bSwdenkEnvironment Variables are set using "setenv", printed using 2022c609719bSwdenk"printenv", and saved to Flash using "saveenv". Using "setenv" 2023c609719bSwdenkwithout a value can be used to delete a variable from the 2024c609719bSwdenkenvironment. As long as you don't save the environment you are 2025c609719bSwdenkworking with an in-memory copy. In case the Flash area containing the 2026c609719bSwdenkenvironment is erased by accident, a default environment is provided. 2027c609719bSwdenk 2028c609719bSwdenkSome configuration options can be set using Environment Variables: 2029c609719bSwdenk 2030c609719bSwdenk baudrate - see CONFIG_BAUDRATE 2031c609719bSwdenk 2032c609719bSwdenk bootdelay - see CONFIG_BOOTDELAY 2033c609719bSwdenk 2034c609719bSwdenk bootcmd - see CONFIG_BOOTCOMMAND 2035c609719bSwdenk 2036c609719bSwdenk bootargs - Boot arguments when booting an RTOS image 2037c609719bSwdenk 2038c609719bSwdenk bootfile - Name of the image to load with TFTP 2039c609719bSwdenk 2040c609719bSwdenk autoload - if set to "no" (any string beginning with 'n'), 2041c609719bSwdenk "bootp" will just load perform a lookup of the 2042c609719bSwdenk configuration from the BOOTP server, but not try to 2043c609719bSwdenk load any image using TFTP 2044c609719bSwdenk 2045c609719bSwdenk autostart - if set to "yes", an image loaded using the "bootp", 2046c609719bSwdenk "rarpboot", "tftpboot" or "diskboot" commands will 2047c609719bSwdenk be automatically started (by internally calling 2048c609719bSwdenk "bootm") 2049c609719bSwdenk 20504a6fd34bSwdenk If set to "no", a standalone image passed to the 20514a6fd34bSwdenk "bootm" command will be copied to the load address 20524a6fd34bSwdenk (and eventually uncompressed), but NOT be started. 20534a6fd34bSwdenk This can be used to load and uncompress arbitrary 20544a6fd34bSwdenk data. 20554a6fd34bSwdenk 2056c609719bSwdenk initrd_high - restrict positioning of initrd images: 2057c609719bSwdenk If this variable is not set, initrd images will be 2058c609719bSwdenk copied to the highest possible address in RAM; this 2059c609719bSwdenk is usually what you want since it allows for 2060c609719bSwdenk maximum initrd size. If for some reason you want to 2061c609719bSwdenk make sure that the initrd image is loaded below the 2062c609719bSwdenk CFG_BOOTMAPSZ limit, you can set this environment 2063c609719bSwdenk variable to a value of "no" or "off" or "0". 2064c609719bSwdenk Alternatively, you can set it to a maximum upper 2065c609719bSwdenk address to use (U-Boot will still check that it 2066c609719bSwdenk does not overwrite the U-Boot stack and data). 2067c609719bSwdenk 2068c609719bSwdenk For instance, when you have a system with 16 MB 2069c609719bSwdenk RAM, and want to reseve 4 MB from use by Linux, 2070c609719bSwdenk you can do this by adding "mem=12M" to the value of 2071c609719bSwdenk the "bootargs" variable. However, now you must make 2072c609719bSwdenk sure, that the initrd image is placed in the first 2073c609719bSwdenk 12 MB as well - this can be done with 2074c609719bSwdenk 2075c609719bSwdenk setenv initrd_high 00c00000 2076c609719bSwdenk 207738b99261Swdenk If you set initrd_high to 0xFFFFFFFF, this is an 207838b99261Swdenk indication to U-Boot that all addresses are legal 207938b99261Swdenk for the Linux kernel, including addresses in flash 208038b99261Swdenk memory. In this case U-Boot will NOT COPY the 208138b99261Swdenk ramdisk at all. This may be useful to reduce the 208238b99261Swdenk boot time on your system, but requires that this 208338b99261Swdenk feature is supported by your Linux kernel. 208438b99261Swdenk 2085c609719bSwdenk ipaddr - IP address; needed for tftpboot command 2086c609719bSwdenk 2087c609719bSwdenk loadaddr - Default load address for commands like "bootp", 2088dc7c9a1aSwdenk "rarpboot", "tftpboot", "loadb" or "diskboot" 2089c609719bSwdenk 2090c609719bSwdenk loads_echo - see CONFIG_LOADS_ECHO 2091c609719bSwdenk 2092c609719bSwdenk serverip - TFTP server IP address; needed for tftpboot command 2093c609719bSwdenk 2094c609719bSwdenk bootretry - see CONFIG_BOOT_RETRY_TIME 2095c609719bSwdenk 2096c609719bSwdenk bootdelaykey - see CONFIG_AUTOBOOT_DELAY_STR 2097c609719bSwdenk 2098c609719bSwdenk bootstopkey - see CONFIG_AUTOBOOT_STOP_STR 2099c609719bSwdenk 2100c609719bSwdenk 2101c609719bSwdenkThe following environment variables may be used and automatically 2102c609719bSwdenkupdated by the network boot commands ("bootp" and "rarpboot"), 2103c609719bSwdenkdepending the information provided by your boot server: 2104c609719bSwdenk 2105c609719bSwdenk bootfile - see above 2106c609719bSwdenk dnsip - IP address of your Domain Name Server 2107c609719bSwdenk gatewayip - IP address of the Gateway (Router) to use 2108c609719bSwdenk hostname - Target hostname 2109c609719bSwdenk ipaddr - see above 2110c609719bSwdenk netmask - Subnet Mask 2111c609719bSwdenk rootpath - Pathname of the root filesystem on the NFS server 2112c609719bSwdenk serverip - see above 2113c609719bSwdenk 2114c609719bSwdenk 2115c609719bSwdenkThere are two special Environment Variables: 2116c609719bSwdenk 2117c609719bSwdenk serial# - contains hardware identification information such 2118c609719bSwdenk as type string and/or serial number 2119c609719bSwdenk ethaddr - Ethernet address 2120c609719bSwdenk 2121c609719bSwdenkThese variables can be set only once (usually during manufacturing of 2122c609719bSwdenkthe board). U-Boot refuses to delete or overwrite these variables 2123c609719bSwdenkonce they have been set once. 2124c609719bSwdenk 2125c609719bSwdenk 2126c1551ea8SstroeseFurther special Environment Variables: 2127c1551ea8Sstroese 2128c1551ea8Sstroese ver - Contains the U-Boot version string as printed 2129c1551ea8Sstroese with the "version" command. This variable is 2130c1551ea8Sstroese readonly (see CONFIG_VERSION_VARIABLE). 2131c1551ea8Sstroese 2132c1551ea8Sstroese 2133c609719bSwdenkPlease note that changes to some configuration parameters may take 2134c609719bSwdenkonly effect after the next boot (yes, that's just like Windoze :-). 2135c609719bSwdenk 2136c609719bSwdenk 2137f07771ccSwdenkCommand Line Parsing: 2138f07771ccSwdenk===================== 2139f07771ccSwdenk 2140f07771ccSwdenkThere are two different command line parsers available with U-Boot: 2141f07771ccSwdenkthe old "simple" one, and the much more pwerful "hush" shell: 2142f07771ccSwdenk 2143f07771ccSwdenkOld, simple command line parser: 2144f07771ccSwdenk-------------------------------- 2145f07771ccSwdenk 2146f07771ccSwdenk- supports environment variables (through setenv / saveenv commands) 2147f07771ccSwdenk- several commands on one line, separated by ';' 2148f07771ccSwdenk- variable substitution using "... $(name) ..." syntax 2149f07771ccSwdenk- special characters ('$', ';') can be escaped by prefixing with '\', 2150f07771ccSwdenk for example: 2151f07771ccSwdenk setenv bootcmd bootm \$(address) 2152f07771ccSwdenk- You can also escape text by enclosing in single apostrophes, for example: 2153f07771ccSwdenk setenv addip 'setenv bootargs $bootargs ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname::off' 2154f07771ccSwdenk 2155f07771ccSwdenkHush shell: 2156f07771ccSwdenk----------- 2157f07771ccSwdenk 2158f07771ccSwdenk- similar to Bourne shell, with control structures like 2159f07771ccSwdenk if...then...else...fi, for...do...done; while...do...done, 2160f07771ccSwdenk until...do...done, ... 2161f07771ccSwdenk- supports environment ("global") variables (through setenv / saveenv 2162f07771ccSwdenk commands) and local shell variables (through standard shell syntax 2163f07771ccSwdenk "name=value"); only environment variables can be used with "run" 2164f07771ccSwdenk command 2165f07771ccSwdenk 2166f07771ccSwdenkGeneral rules: 2167f07771ccSwdenk-------------- 2168f07771ccSwdenk 2169f07771ccSwdenk(1) If a command line (or an environment variable executed by a "run" 2170f07771ccSwdenk command) contains several commands separated by semicolon, and 2171f07771ccSwdenk one of these commands fails, then the remaining commands will be 2172f07771ccSwdenk executed anyway. 2173f07771ccSwdenk 2174f07771ccSwdenk(2) If you execute several variables with one call to run (i. e. 2175f07771ccSwdenk calling run with a list af variables as arguments), any failing 2176f07771ccSwdenk command will cause "run" to terminate, i. e. the remaining 2177f07771ccSwdenk variables are not executed. 2178f07771ccSwdenk 2179c609719bSwdenkNote for Redundant Ethernet Interfaces: 2180c609719bSwdenk======================================= 2181c609719bSwdenk 2182c609719bSwdenkSome boards come with redundand ethernet interfaces; U-Boot supports 2183c609719bSwdenksuch configurations and is capable of automatic selection of a 2184c609719bSwdenk"working" interface when needed. MAC assignemnt works as follows: 2185c609719bSwdenk 2186c609719bSwdenkNetwork interfaces are numbered eth0, eth1, eth2, ... Corresponding 2187c609719bSwdenkMAC addresses can be stored in the environment as "ethaddr" (=>eth0), 2188c609719bSwdenk"eth1addr" (=>eth1), "eth2addr", ... 2189c609719bSwdenk 2190c609719bSwdenkIf the network interface stores some valid MAC address (for instance 2191c609719bSwdenkin SROM), this is used as default address if there is NO correspon- 2192c609719bSwdenkding setting in the environment; if the corresponding environment 2193c609719bSwdenkvariable is set, this overrides the settings in the card; that means: 2194c609719bSwdenk 2195c609719bSwdenko If the SROM has a valid MAC address, and there is no address in the 2196c609719bSwdenk environment, the SROM's address is used. 2197c609719bSwdenk 2198c609719bSwdenko If there is no valid address in the SROM, and a definition in the 2199c609719bSwdenk environment exists, then the value from the environment variable is 2200c609719bSwdenk used. 2201c609719bSwdenk 2202c609719bSwdenko If both the SROM and the environment contain a MAC address, and 2203c609719bSwdenk both addresses are the same, this MAC address is used. 2204c609719bSwdenk 2205c609719bSwdenko If both the SROM and the environment contain a MAC address, and the 2206c609719bSwdenk addresses differ, the value from the environment is used and a 2207c609719bSwdenk warning is printed. 2208c609719bSwdenk 2209c609719bSwdenko If neither SROM nor the environment contain a MAC address, an error 2210c609719bSwdenk is raised. 2211c609719bSwdenk 2212c609719bSwdenk 2213c609719bSwdenkImage Formats: 2214c609719bSwdenk============== 2215c609719bSwdenk 2216c609719bSwdenkThe "boot" commands of this monitor operate on "image" files which 2217c609719bSwdenkcan be basicly anything, preceeded by a special header; see the 2218c609719bSwdenkdefinitions in include/image.h for details; basicly, the header 2219c609719bSwdenkdefines the following image properties: 2220c609719bSwdenk 2221c609719bSwdenk* Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD, 2222c609719bSwdenk 4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks, 22237f70e853Swdenk LynxOS, pSOS, QNX, RTEMS, ARTOS; 22247f70e853Swdenk Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, ARTOS). 2225c609719bSwdenk* Target CPU Architecture (Provisions for Alpha, ARM, Intel x86, 2226c609719bSwdenk IA64, MIPS, MIPS, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit; 2227c609719bSwdenk Currently supported: PowerPC). 2228c609719bSwdenk* Compression Type (Provisions for uncompressed, gzip, bzip2; 2229c609719bSwdenk Currently supported: uncompressed, gzip). 2230c609719bSwdenk* Load Address 2231c609719bSwdenk* Entry Point 2232c609719bSwdenk* Image Name 2233c609719bSwdenk* Image Timestamp 2234c609719bSwdenk 2235c609719bSwdenkThe header is marked by a special Magic Number, and both the header 2236c609719bSwdenkand the data portions of the image are secured against corruption by 2237c609719bSwdenkCRC32 checksums. 2238c609719bSwdenk 2239c609719bSwdenk 2240c609719bSwdenkLinux Support: 2241c609719bSwdenk============== 2242c609719bSwdenk 2243c609719bSwdenkAlthough U-Boot should support any OS or standalone application 2244c609719bSwdenkeasily, Linux has always been in the focus during the design of 2245c609719bSwdenkU-Boot. 2246c609719bSwdenk 2247c609719bSwdenkU-Boot includes many features that so far have been part of some 2248c609719bSwdenkspecial "boot loader" code within the Linux kernel. Also, any 2249c609719bSwdenk"initrd" images to be used are no longer part of one big Linux image; 2250c609719bSwdenkinstead, kernel and "initrd" are separate images. This implementation 2251c609719bSwdenkserves serveral purposes: 2252c609719bSwdenk 2253c609719bSwdenk- the same features can be used for other OS or standalone 2254c609719bSwdenk applications (for instance: using compressed images to reduce the 2255c609719bSwdenk Flash memory footprint) 2256c609719bSwdenk 2257c609719bSwdenk- it becomes much easier to port new Linux kernel versions because 2258c609719bSwdenk lots of low-level, hardware dependend stuff are done by U-Boot 2259c609719bSwdenk 2260c609719bSwdenk- the same Linux kernel image can now be used with different "initrd" 2261c609719bSwdenk images; of course this also means that different kernel images can 2262c609719bSwdenk be run with the same "initrd". This makes testing easier (you don't 2263c609719bSwdenk have to build a new "zImage.initrd" Linux image when you just 2264c609719bSwdenk change a file in your "initrd"). Also, a field-upgrade of the 2265c609719bSwdenk software is easier now. 2266c609719bSwdenk 2267c609719bSwdenk 2268c609719bSwdenkLinux HOWTO: 2269c609719bSwdenk============ 2270c609719bSwdenk 2271c609719bSwdenkPorting Linux to U-Boot based systems: 2272c609719bSwdenk--------------------------------------- 2273c609719bSwdenk 2274c609719bSwdenkU-Boot cannot save you from doing all the necessary modifications to 2275c609719bSwdenkconfigure the Linux device drivers for use with your target hardware 2276c609719bSwdenk(no, we don't intend to provide a full virtual machine interface to 2277c609719bSwdenkLinux :-). 2278c609719bSwdenk 2279c609719bSwdenkBut now you can ignore ALL boot loader code (in arch/ppc/mbxboot). 2280c609719bSwdenk 2281c609719bSwdenkJust make sure your machine specific header file (for instance 2282c609719bSwdenkinclude/asm-ppc/tqm8xx.h) includes the same definition of the Board 2283c609719bSwdenkInformation structure as we define in include/u-boot.h, and make 2284c609719bSwdenksure that your definition of IMAP_ADDR uses the same value as your 2285c609719bSwdenkU-Boot configuration in CFG_IMMR. 2286c609719bSwdenk 2287c609719bSwdenk 2288c609719bSwdenkConfiguring the Linux kernel: 2289c609719bSwdenk----------------------------- 2290c609719bSwdenk 2291c609719bSwdenkNo specific requirements for U-Boot. Make sure you have some root 2292c609719bSwdenkdevice (initial ramdisk, NFS) for your target system. 2293c609719bSwdenk 2294c609719bSwdenk 2295c609719bSwdenkBuilding a Linux Image: 2296c609719bSwdenk----------------------- 2297c609719bSwdenk 229824ee89b9SwdenkWith U-Boot, "normal" build targets like "zImage" or "bzImage" are 229924ee89b9Swdenknot used. If you use recent kernel source, a new build target 230024ee89b9Swdenk"uImage" will exist which automatically builds an image usable by 230124ee89b9SwdenkU-Boot. Most older kernels also have support for a "pImage" target, 230224ee89b9Swdenkwhich was introduced for our predecessor project PPCBoot and uses a 230324ee89b9Swdenk100% compatible format. 2304c609719bSwdenk 2305c609719bSwdenkExample: 2306c609719bSwdenk 2307c609719bSwdenk make TQM850L_config 2308c609719bSwdenk make oldconfig 2309c609719bSwdenk make dep 231024ee89b9Swdenk make uImage 2311c609719bSwdenk 231224ee89b9SwdenkThe "uImage" build target uses a special tool (in 'tools/mkimage') to 231324ee89b9Swdenkencapsulate a compressed Linux kernel image with header information, 231424ee89b9SwdenkCRC32 checksum etc. for use with U-Boot. This is what we are doing: 2315c609719bSwdenk 231624ee89b9Swdenk* build a standard "vmlinux" kernel image (in ELF binary format): 231724ee89b9Swdenk 231824ee89b9Swdenk* convert the kernel into a raw binary image: 231924ee89b9Swdenk 232024ee89b9Swdenk ${CROSS_COMPILE}-objcopy -O binary \ 232124ee89b9Swdenk -R .note -R .comment \ 232224ee89b9Swdenk -S vmlinux linux.bin 232324ee89b9Swdenk 232424ee89b9Swdenk* compress the binary image: 232524ee89b9Swdenk 232624ee89b9Swdenk gzip -9 linux.bin 232724ee89b9Swdenk 232824ee89b9Swdenk* package compressed binary image for U-Boot: 232924ee89b9Swdenk 233024ee89b9Swdenk mkimage -A ppc -O linux -T kernel -C gzip \ 233124ee89b9Swdenk -a 0 -e 0 -n "Linux Kernel Image" \ 233224ee89b9Swdenk -d linux.bin.gz uImage 233324ee89b9Swdenk 233424ee89b9Swdenk 233524ee89b9SwdenkThe "mkimage" tool can also be used to create ramdisk images for use 233624ee89b9Swdenkwith U-Boot, either separated from the Linux kernel image, or 233724ee89b9Swdenkcombined into one file. "mkimage" encapsulates the images with a 64 233824ee89b9Swdenkbyte header containing information about target architecture, 233924ee89b9Swdenkoperating system, image type, compression method, entry points, time 234024ee89b9Swdenkstamp, CRC32 checksums, etc. 234124ee89b9Swdenk 234224ee89b9Swdenk"mkimage" can be called in two ways: to verify existing images and 234324ee89b9Swdenkprint the header information, or to build new images. 2344c609719bSwdenk 2345c609719bSwdenkIn the first form (with "-l" option) mkimage lists the information 2346c609719bSwdenkcontained in the header of an existing U-Boot image; this includes 2347c609719bSwdenkchecksum verification: 2348c609719bSwdenk 2349c609719bSwdenk tools/mkimage -l image 2350c609719bSwdenk -l ==> list image header information 2351c609719bSwdenk 2352c609719bSwdenkThe second form (with "-d" option) is used to build a U-Boot image 2353c609719bSwdenkfrom a "data file" which is used as image payload: 2354c609719bSwdenk 2355c609719bSwdenk tools/mkimage -A arch -O os -T type -C comp -a addr -e ep \ 2356c609719bSwdenk -n name -d data_file image 2357c609719bSwdenk -A ==> set architecture to 'arch' 2358c609719bSwdenk -O ==> set operating system to 'os' 2359c609719bSwdenk -T ==> set image type to 'type' 2360c609719bSwdenk -C ==> set compression type 'comp' 2361c609719bSwdenk -a ==> set load address to 'addr' (hex) 2362c609719bSwdenk -e ==> set entry point to 'ep' (hex) 2363c609719bSwdenk -n ==> set image name to 'name' 2364c609719bSwdenk -d ==> use image data from 'datafile' 2365c609719bSwdenk 2366c609719bSwdenkRight now, all Linux kernels use the same load address (0x00000000), 2367c609719bSwdenkbut the entry point address depends on the kernel version: 2368c609719bSwdenk 2369c609719bSwdenk- 2.2.x kernels have the entry point at 0x0000000C, 237024ee89b9Swdenk- 2.3.x and later kernels have the entry point at 0x00000000. 2371c609719bSwdenk 2372c609719bSwdenkSo a typical call to build a U-Boot image would read: 2373c609719bSwdenk 237424ee89b9Swdenk -> tools/mkimage -n '2.4.4 kernel for TQM850L' \ 237524ee89b9Swdenk > -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \ 237624ee89b9Swdenk > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/ppc/coffboot/vmlinux.gz \ 237724ee89b9Swdenk > examples/uImage.TQM850L 237824ee89b9Swdenk Image Name: 2.4.4 kernel for TQM850L 2379c609719bSwdenk Created: Wed Jul 19 02:34:59 2000 2380c609719bSwdenk Image Type: PowerPC Linux Kernel Image (gzip compressed) 2381c609719bSwdenk Data Size: 335725 Bytes = 327.86 kB = 0.32 MB 2382c609719bSwdenk Load Address: 0x00000000 238324ee89b9Swdenk Entry Point: 0x00000000 2384c609719bSwdenk 2385c609719bSwdenkTo verify the contents of the image (or check for corruption): 2386c609719bSwdenk 238724ee89b9Swdenk -> tools/mkimage -l examples/uImage.TQM850L 238824ee89b9Swdenk Image Name: 2.4.4 kernel for TQM850L 2389c609719bSwdenk Created: Wed Jul 19 02:34:59 2000 2390c609719bSwdenk Image Type: PowerPC Linux Kernel Image (gzip compressed) 2391c609719bSwdenk Data Size: 335725 Bytes = 327.86 kB = 0.32 MB 2392c609719bSwdenk Load Address: 0x00000000 239324ee89b9Swdenk Entry Point: 0x00000000 2394c609719bSwdenk 2395c609719bSwdenkNOTE: for embedded systems where boot time is critical you can trade 2396c609719bSwdenkspeed for memory and install an UNCOMPRESSED image instead: this 2397c609719bSwdenkneeds more space in Flash, but boots much faster since it does not 2398c609719bSwdenkneed to be uncompressed: 2399c609719bSwdenk 240024ee89b9Swdenk -> gunzip /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/ppc/coffboot/vmlinux.gz 240124ee89b9Swdenk -> tools/mkimage -n '2.4.4 kernel for TQM850L' \ 240224ee89b9Swdenk > -A ppc -O linux -T kernel -C none -a 0 -e 0 \ 240324ee89b9Swdenk > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/ppc/coffboot/vmlinux \ 240424ee89b9Swdenk > examples/uImage.TQM850L-uncompressed 240524ee89b9Swdenk Image Name: 2.4.4 kernel for TQM850L 2406c609719bSwdenk Created: Wed Jul 19 02:34:59 2000 2407c609719bSwdenk Image Type: PowerPC Linux Kernel Image (uncompressed) 2408c609719bSwdenk Data Size: 792160 Bytes = 773.59 kB = 0.76 MB 2409c609719bSwdenk Load Address: 0x00000000 241024ee89b9Swdenk Entry Point: 0x00000000 2411c609719bSwdenk 2412c609719bSwdenk 2413c609719bSwdenkSimilar you can build U-Boot images from a 'ramdisk.image.gz' file 2414c609719bSwdenkwhen your kernel is intended to use an initial ramdisk: 2415c609719bSwdenk 2416c609719bSwdenk -> tools/mkimage -n 'Simple Ramdisk Image' \ 2417c609719bSwdenk > -A ppc -O linux -T ramdisk -C gzip \ 2418c609719bSwdenk > -d /LinuxPPC/images/SIMPLE-ramdisk.image.gz examples/simple-initrd 2419c609719bSwdenk Image Name: Simple Ramdisk Image 2420c609719bSwdenk Created: Wed Jan 12 14:01:50 2000 2421c609719bSwdenk Image Type: PowerPC Linux RAMDisk Image (gzip compressed) 2422c609719bSwdenk Data Size: 566530 Bytes = 553.25 kB = 0.54 MB 2423c609719bSwdenk Load Address: 0x00000000 2424c609719bSwdenk Entry Point: 0x00000000 2425c609719bSwdenk 2426c609719bSwdenk 2427c609719bSwdenkInstalling a Linux Image: 2428c609719bSwdenk------------------------- 2429c609719bSwdenk 2430c609719bSwdenkTo downloading a U-Boot image over the serial (console) interface, 2431c609719bSwdenkyou must convert the image to S-Record format: 2432c609719bSwdenk 2433c609719bSwdenk objcopy -I binary -O srec examples/image examples/image.srec 2434c609719bSwdenk 2435c609719bSwdenkThe 'objcopy' does not understand the information in the U-Boot 2436c609719bSwdenkimage header, so the resulting S-Record file will be relative to 2437c609719bSwdenkaddress 0x00000000. To load it to a given address, you need to 2438c609719bSwdenkspecify the target address as 'offset' parameter with the 'loads' 2439c609719bSwdenkcommand. 2440c609719bSwdenk 2441c609719bSwdenkExample: install the image to address 0x40100000 (which on the 2442c609719bSwdenkTQM8xxL is in the first Flash bank): 2443c609719bSwdenk 2444c609719bSwdenk => erase 40100000 401FFFFF 2445c609719bSwdenk 2446c609719bSwdenk .......... done 2447c609719bSwdenk Erased 8 sectors 2448c609719bSwdenk 2449c609719bSwdenk => loads 40100000 2450c609719bSwdenk ## Ready for S-Record download ... 2451c609719bSwdenk ~>examples/image.srec 2452c609719bSwdenk 1 2 3 4 5 6 7 8 9 10 11 12 13 ... 2453c609719bSwdenk ... 2454c609719bSwdenk 15989 15990 15991 15992 2455c609719bSwdenk [file transfer complete] 2456c609719bSwdenk [connected] 2457c609719bSwdenk ## Start Addr = 0x00000000 2458c609719bSwdenk 2459c609719bSwdenk 2460c609719bSwdenkYou can check the success of the download using the 'iminfo' command; 2461c609719bSwdenkthis includes a checksum verification so you can be sure no data 2462c609719bSwdenkcorruption happened: 2463c609719bSwdenk 2464c609719bSwdenk => imi 40100000 2465c609719bSwdenk 2466c609719bSwdenk ## Checking Image at 40100000 ... 2467c609719bSwdenk Image Name: 2.2.13 for initrd on TQM850L 2468c609719bSwdenk Image Type: PowerPC Linux Kernel Image (gzip compressed) 2469c609719bSwdenk Data Size: 335725 Bytes = 327 kB = 0 MB 2470c609719bSwdenk Load Address: 00000000 2471c609719bSwdenk Entry Point: 0000000c 2472c609719bSwdenk Verifying Checksum ... OK 2473c609719bSwdenk 2474c609719bSwdenk 2475c609719bSwdenkBoot Linux: 2476c609719bSwdenk----------- 2477c609719bSwdenk 2478c609719bSwdenkThe "bootm" command is used to boot an application that is stored in 2479c609719bSwdenkmemory (RAM or Flash). In case of a Linux kernel image, the contents 2480c609719bSwdenkof the "bootargs" environment variable is passed to the kernel as 2481c609719bSwdenkparameters. You can check and modify this variable using the 2482c609719bSwdenk"printenv" and "setenv" commands: 2483c609719bSwdenk 2484c609719bSwdenk 2485c609719bSwdenk => printenv bootargs 2486c609719bSwdenk bootargs=root=/dev/ram 2487c609719bSwdenk 2488c609719bSwdenk => setenv bootargs root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2 2489c609719bSwdenk 2490c609719bSwdenk => printenv bootargs 2491c609719bSwdenk bootargs=root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2 2492c609719bSwdenk 2493c609719bSwdenk => bootm 40020000 2494c609719bSwdenk ## Booting Linux kernel at 40020000 ... 2495c609719bSwdenk Image Name: 2.2.13 for NFS on TQM850L 2496c609719bSwdenk Image Type: PowerPC Linux Kernel Image (gzip compressed) 2497c609719bSwdenk Data Size: 381681 Bytes = 372 kB = 0 MB 2498c609719bSwdenk Load Address: 00000000 2499c609719bSwdenk Entry Point: 0000000c 2500c609719bSwdenk Verifying Checksum ... OK 2501c609719bSwdenk Uncompressing Kernel Image ... OK 2502c609719bSwdenk 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 2503c609719bSwdenk Boot arguments: root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2 2504c609719bSwdenk time_init: decrementer frequency = 187500000/60 2505c609719bSwdenk Calibrating delay loop... 49.77 BogoMIPS 2506c609719bSwdenk Memory: 15208k available (700k kernel code, 444k data, 32k init) [c0000000,c1000000] 2507c609719bSwdenk ... 2508c609719bSwdenk 2509c609719bSwdenkIf you want to boot a Linux kernel with initial ram disk, you pass 2510c609719bSwdenkthe memory addreses of both the kernel and the initrd image (PPBCOOT 2511c609719bSwdenkformat!) to the "bootm" command: 2512c609719bSwdenk 2513c609719bSwdenk => imi 40100000 40200000 2514c609719bSwdenk 2515c609719bSwdenk ## Checking Image at 40100000 ... 2516c609719bSwdenk Image Name: 2.2.13 for initrd on TQM850L 2517c609719bSwdenk Image Type: PowerPC Linux Kernel Image (gzip compressed) 2518c609719bSwdenk Data Size: 335725 Bytes = 327 kB = 0 MB 2519c609719bSwdenk Load Address: 00000000 2520c609719bSwdenk Entry Point: 0000000c 2521c609719bSwdenk Verifying Checksum ... OK 2522c609719bSwdenk 2523c609719bSwdenk ## Checking Image at 40200000 ... 2524c609719bSwdenk Image Name: Simple Ramdisk Image 2525c609719bSwdenk Image Type: PowerPC Linux RAMDisk Image (gzip compressed) 2526c609719bSwdenk Data Size: 566530 Bytes = 553 kB = 0 MB 2527c609719bSwdenk Load Address: 00000000 2528c609719bSwdenk Entry Point: 00000000 2529c609719bSwdenk Verifying Checksum ... OK 2530c609719bSwdenk 2531c609719bSwdenk => bootm 40100000 40200000 2532c609719bSwdenk ## Booting Linux kernel at 40100000 ... 2533c609719bSwdenk Image Name: 2.2.13 for initrd on TQM850L 2534c609719bSwdenk Image Type: PowerPC Linux Kernel Image (gzip compressed) 2535c609719bSwdenk Data Size: 335725 Bytes = 327 kB = 0 MB 2536c609719bSwdenk Load Address: 00000000 2537c609719bSwdenk Entry Point: 0000000c 2538c609719bSwdenk Verifying Checksum ... OK 2539c609719bSwdenk Uncompressing Kernel Image ... OK 2540c609719bSwdenk ## Loading RAMDisk Image at 40200000 ... 2541c609719bSwdenk Image Name: Simple Ramdisk Image 2542c609719bSwdenk Image Type: PowerPC Linux RAMDisk Image (gzip compressed) 2543c609719bSwdenk Data Size: 566530 Bytes = 553 kB = 0 MB 2544c609719bSwdenk Load Address: 00000000 2545c609719bSwdenk Entry Point: 00000000 2546c609719bSwdenk Verifying Checksum ... OK 2547c609719bSwdenk Loading Ramdisk ... OK 2548c609719bSwdenk 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 2549c609719bSwdenk Boot arguments: root=/dev/ram 2550c609719bSwdenk time_init: decrementer frequency = 187500000/60 2551c609719bSwdenk Calibrating delay loop... 49.77 BogoMIPS 2552c609719bSwdenk ... 2553c609719bSwdenk RAMDISK: Compressed image found at block 0 2554c609719bSwdenk VFS: Mounted root (ext2 filesystem). 2555c609719bSwdenk 2556c609719bSwdenk bash# 2557c609719bSwdenk 25586069ff26SwdenkMore About U-Boot Image Types: 25596069ff26Swdenk------------------------------ 25606069ff26Swdenk 25616069ff26SwdenkU-Boot supports the following image types: 25626069ff26Swdenk 25636069ff26Swdenk "Standalone Programs" are directly runnable in the environment 25646069ff26Swdenk provided by U-Boot; it is expected that (if they behave 25656069ff26Swdenk well) you can continue to work in U-Boot after return from 25666069ff26Swdenk the Standalone Program. 25676069ff26Swdenk "OS Kernel Images" are usually images of some Embedded OS which 25686069ff26Swdenk will take over control completely. Usually these programs 25696069ff26Swdenk will install their own set of exception handlers, device 25706069ff26Swdenk drivers, set up the MMU, etc. - this means, that you cannot 25716069ff26Swdenk expect to re-enter U-Boot except by resetting the CPU. 25726069ff26Swdenk "RAMDisk Images" are more or less just data blocks, and their 25736069ff26Swdenk parameters (address, size) are passed to an OS kernel that is 25746069ff26Swdenk being started. 25756069ff26Swdenk "Multi-File Images" contain several images, typically an OS 25766069ff26Swdenk (Linux) kernel image and one or more data images like 25776069ff26Swdenk RAMDisks. This construct is useful for instance when you want 25786069ff26Swdenk to boot over the network using BOOTP etc., where the boot 25796069ff26Swdenk server provides just a single image file, but you want to get 25806069ff26Swdenk for instance an OS kernel and a RAMDisk image. 25816069ff26Swdenk 25826069ff26Swdenk "Multi-File Images" start with a list of image sizes, each 25836069ff26Swdenk image size (in bytes) specified by an "uint32_t" in network 25846069ff26Swdenk byte order. This list is terminated by an "(uint32_t)0". 25856069ff26Swdenk Immediately after the terminating 0 follow the images, one by 25866069ff26Swdenk one, all aligned on "uint32_t" boundaries (size rounded up to 25876069ff26Swdenk a multiple of 4 bytes). 25886069ff26Swdenk 25896069ff26Swdenk "Firmware Images" are binary images containing firmware (like 25906069ff26Swdenk U-Boot or FPGA images) which usually will be programmed to 25916069ff26Swdenk flash memory. 25926069ff26Swdenk 25936069ff26Swdenk "Script files" are command sequences that will be executed by 25946069ff26Swdenk U-Boot's command interpreter; this feature is especially 25956069ff26Swdenk useful when you configure U-Boot to use a real shell (hush) 25966069ff26Swdenk as command interpreter. 25976069ff26Swdenk 2598c609719bSwdenk 2599c609719bSwdenkStandalone HOWTO: 2600c609719bSwdenk================= 2601c609719bSwdenk 2602c609719bSwdenkOne of the features of U-Boot is that you can dynamically load and 2603c609719bSwdenkrun "standalone" applications, which can use some resources of 2604c609719bSwdenkU-Boot like console I/O functions or interrupt services. 2605c609719bSwdenk 2606c609719bSwdenkTwo simple examples are included with the sources: 2607c609719bSwdenk 2608c609719bSwdenk"Hello World" Demo: 2609c609719bSwdenk------------------- 2610c609719bSwdenk 2611c609719bSwdenk'examples/hello_world.c' contains a small "Hello World" Demo 2612c609719bSwdenkapplication; it is automatically compiled when you build U-Boot. 2613c609719bSwdenkIt's configured to run at address 0x00040004, so you can play with it 2614c609719bSwdenklike that: 2615c609719bSwdenk 2616c609719bSwdenk => loads 2617c609719bSwdenk ## Ready for S-Record download ... 2618c609719bSwdenk ~>examples/hello_world.srec 2619c609719bSwdenk 1 2 3 4 5 6 7 8 9 10 11 ... 2620c609719bSwdenk [file transfer complete] 2621c609719bSwdenk [connected] 2622c609719bSwdenk ## Start Addr = 0x00040004 2623c609719bSwdenk 2624c609719bSwdenk => go 40004 Hello World! This is a test. 2625c609719bSwdenk ## Starting application at 0x00040004 ... 2626c609719bSwdenk Hello World 2627c609719bSwdenk argc = 7 2628c609719bSwdenk argv[0] = "40004" 2629c609719bSwdenk argv[1] = "Hello" 2630c609719bSwdenk argv[2] = "World!" 2631c609719bSwdenk argv[3] = "This" 2632c609719bSwdenk argv[4] = "is" 2633c609719bSwdenk argv[5] = "a" 2634c609719bSwdenk argv[6] = "test." 2635c609719bSwdenk argv[7] = "<NULL>" 2636c609719bSwdenk Hit any key to exit ... 2637c609719bSwdenk 2638c609719bSwdenk ## Application terminated, rc = 0x0 2639c609719bSwdenk 2640c609719bSwdenkAnother example, which demonstrates how to register a CPM interrupt 2641c609719bSwdenkhandler with the U-Boot code, can be found in 'examples/timer.c'. 2642c609719bSwdenkHere, a CPM timer is set up to generate an interrupt every second. 2643c609719bSwdenkThe interrupt service routine is trivial, just printing a '.' 2644c609719bSwdenkcharacter, but this is just a demo program. The application can be 2645c609719bSwdenkcontrolled by the following keys: 2646c609719bSwdenk 2647c609719bSwdenk ? - print current values og the CPM Timer registers 2648c609719bSwdenk b - enable interrupts and start timer 2649c609719bSwdenk e - stop timer and disable interrupts 2650c609719bSwdenk q - quit application 2651c609719bSwdenk 2652c609719bSwdenk => loads 2653c609719bSwdenk ## Ready for S-Record download ... 2654c609719bSwdenk ~>examples/timer.srec 2655c609719bSwdenk 1 2 3 4 5 6 7 8 9 10 11 ... 2656c609719bSwdenk [file transfer complete] 2657c609719bSwdenk [connected] 2658c609719bSwdenk ## Start Addr = 0x00040004 2659c609719bSwdenk 2660c609719bSwdenk => go 40004 2661c609719bSwdenk ## Starting application at 0x00040004 ... 2662c609719bSwdenk TIMERS=0xfff00980 2663c609719bSwdenk Using timer 1 2664c609719bSwdenk tgcr @ 0xfff00980, tmr @ 0xfff00990, trr @ 0xfff00994, tcr @ 0xfff00998, tcn @ 0xfff0099c, ter @ 0xfff009b0 2665c609719bSwdenk 2666c609719bSwdenkHit 'b': 2667c609719bSwdenk [q, b, e, ?] Set interval 1000000 us 2668c609719bSwdenk Enabling timer 2669c609719bSwdenkHit '?': 2670c609719bSwdenk [q, b, e, ?] ........ 2671c609719bSwdenk tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0xef6, ter=0x0 2672c609719bSwdenkHit '?': 2673c609719bSwdenk [q, b, e, ?] . 2674c609719bSwdenk tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x2ad4, ter=0x0 2675c609719bSwdenkHit '?': 2676c609719bSwdenk [q, b, e, ?] . 2677c609719bSwdenk tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x1efc, ter=0x0 2678c609719bSwdenkHit '?': 2679c609719bSwdenk [q, b, e, ?] . 2680c609719bSwdenk tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x169d, ter=0x0 2681c609719bSwdenkHit 'e': 2682c609719bSwdenk [q, b, e, ?] ...Stopping timer 2683c609719bSwdenkHit 'q': 2684c609719bSwdenk [q, b, e, ?] ## Application terminated, rc = 0x0 2685c609719bSwdenk 2686c609719bSwdenk 268785ec0bccSwdenkMinicom warning: 268885ec0bccSwdenk================ 268985ec0bccSwdenk 269085ec0bccSwdenkOver time, many people have reported problems when trying to used the 269185ec0bccSwdenk"minicom" terminal emulation program for serial download. I (wd) 269285ec0bccSwdenkconsider minicom to be broken, and recommend not to use it. Under 2693f07771ccSwdenkUnix, I recommend to use C-Kermit for general purpose use (and 269485ec0bccSwdenkespecially for kermit binary protocol download ("loadb" command), and 269585ec0bccSwdenkuse "cu" for S-Record download ("loads" command). 269685ec0bccSwdenk 269752f52c14SwdenkNevertheless, if you absolutely want to use it try adding this 269852f52c14Swdenkconfiguration to your "File transfer protocols" section: 269952f52c14Swdenk 270052f52c14Swdenk Name Program Name U/D FullScr IO-Red. Multi 270152f52c14Swdenk X kermit /usr/bin/kermit -i -l %l -s Y U Y N N 270252f52c14Swdenk Y kermit /usr/bin/kermit -i -l %l -r N D Y N N 270352f52c14Swdenk 270452f52c14Swdenk 2705c609719bSwdenkNetBSD Notes: 2706c609719bSwdenk============= 2707c609719bSwdenk 2708c609719bSwdenkStarting at version 0.9.2, U-Boot supports NetBSD both as host 2709c609719bSwdenk(build U-Boot) and target system (boots NetBSD/mpc8xx). 2710c609719bSwdenk 2711c609719bSwdenkBuilding requires a cross environment; it is known to work on 2712c609719bSwdenkNetBSD/i386 with the cross-powerpc-netbsd-1.3 package (you will also 2713c609719bSwdenkneed gmake since the Makefiles are not compatible with BSD make). 2714c609719bSwdenkNote that the cross-powerpc package does not install include files; 2715c609719bSwdenkattempting to build U-Boot will fail because <machine/ansi.h> is 2716c609719bSwdenkmissing. This file has to be installed and patched manually: 2717c609719bSwdenk 2718c609719bSwdenk # cd /usr/pkg/cross/powerpc-netbsd/include 2719c609719bSwdenk # mkdir powerpc 2720c609719bSwdenk # ln -s powerpc machine 2721c609719bSwdenk # cp /usr/src/sys/arch/powerpc/include/ansi.h powerpc/ansi.h 2722c609719bSwdenk # ${EDIT} powerpc/ansi.h ## must remove __va_list, _BSD_VA_LIST 2723c609719bSwdenk 2724c609719bSwdenkNative builds *don't* work due to incompatibilities between native 2725c609719bSwdenkand U-Boot include files. 2726c609719bSwdenk 2727c609719bSwdenkBooting assumes that (the first part of) the image booted is a 2728c609719bSwdenkstage-2 loader which in turn loads and then invokes the kernel 2729c609719bSwdenkproper. Loader sources will eventually appear in the NetBSD source 2730c609719bSwdenktree (probably in sys/arc/mpc8xx/stand/u-boot_stage2/); in the 2731c609719bSwdenkmeantime, send mail to bruno@exet-ag.de and/or wd@denx.de for 2732c609719bSwdenkdetails. 2733c609719bSwdenk 2734c609719bSwdenk 2735c609719bSwdenkImplementation Internals: 2736c609719bSwdenk========================= 2737c609719bSwdenk 2738c609719bSwdenkThe following is not intended to be a complete description of every 2739c609719bSwdenkimplementation detail. However, it should help to understand the 2740c609719bSwdenkinner workings of U-Boot and make it easier to port it to custom 2741c609719bSwdenkhardware. 2742c609719bSwdenk 2743c609719bSwdenk 2744c609719bSwdenkInitial Stack, Global Data: 2745c609719bSwdenk--------------------------- 2746c609719bSwdenk 2747c609719bSwdenkThe implementation of U-Boot is complicated by the fact that U-Boot 2748c609719bSwdenkstarts running out of ROM (flash memory), usually without access to 2749c609719bSwdenksystem RAM (because the memory controller is not initialized yet). 2750c609719bSwdenkThis means that we don't have writable Data or BSS segments, and BSS 2751c609719bSwdenkis not initialized as zero. To be able to get a C environment working 2752c609719bSwdenkat all, we have to allocate at least a minimal stack. Implementation 2753c609719bSwdenkoptions for this are defined and restricted by the CPU used: Some CPU 2754c609719bSwdenkmodels provide on-chip memory (like the IMMR area on MPC8xx and 2755c609719bSwdenkMPC826x processors), on others (parts of) the data cache can be 2756c609719bSwdenklocked as (mis-) used as memory, etc. 2757c609719bSwdenk 275843d9616cSwdenk Chris Hallinan posted a good summy of these issues to the 275943d9616cSwdenk u-boot-users mailing list: 276043d9616cSwdenk 276143d9616cSwdenk Subject: RE: [U-Boot-Users] RE: More On Memory Bank x (nothingness)? 276243d9616cSwdenk From: "Chris Hallinan" <clh@net1plus.com> 276343d9616cSwdenk Date: Mon, 10 Feb 2003 16:43:46 -0500 (22:43 MET) 276443d9616cSwdenk ... 276543d9616cSwdenk 276643d9616cSwdenk Correct me if I'm wrong, folks, but the way I understand it 276743d9616cSwdenk is this: Using DCACHE as initial RAM for Stack, etc, does not 276843d9616cSwdenk require any physical RAM backing up the cache. The cleverness 276943d9616cSwdenk is that the cache is being used as a temporary supply of 277043d9616cSwdenk necessary storage before the SDRAM controller is setup. It's 277143d9616cSwdenk beyond the scope of this list to expain the details, but you 277243d9616cSwdenk can see how this works by studying the cache architecture and 277343d9616cSwdenk operation in the architecture and processor-specific manuals. 277443d9616cSwdenk 277543d9616cSwdenk OCM is On Chip Memory, which I believe the 405GP has 4K. It 277643d9616cSwdenk is another option for the system designer to use as an 277743d9616cSwdenk initial stack/ram area prior to SDRAM being available. Either 277843d9616cSwdenk option should work for you. Using CS 4 should be fine if your 277943d9616cSwdenk board designers haven't used it for something that would 278043d9616cSwdenk cause you grief during the initial boot! It is frequently not 278143d9616cSwdenk used. 278243d9616cSwdenk 278343d9616cSwdenk CFG_INIT_RAM_ADDR should be somewhere that won't interfere 278443d9616cSwdenk with your processor/board/system design. The default value 278543d9616cSwdenk you will find in any recent u-boot distribution in 278643d9616cSwdenk Walnut405.h should work for you. I'd set it to a value larger 278743d9616cSwdenk than your SDRAM module. If you have a 64MB SDRAM module, set 278843d9616cSwdenk it above 400_0000. Just make sure your board has no resources 278943d9616cSwdenk that are supposed to respond to that address! That code in 279043d9616cSwdenk start.S has been around a while and should work as is when 279143d9616cSwdenk you get the config right. 279243d9616cSwdenk 279343d9616cSwdenk -Chris Hallinan 279443d9616cSwdenk DS4.COM, Inc. 279543d9616cSwdenk 2796c609719bSwdenkIt is essential to remember this, since it has some impact on the C 2797c609719bSwdenkcode for the initialization procedures: 2798c609719bSwdenk 2799c609719bSwdenk* Initialized global data (data segment) is read-only. Do not attempt 2800c609719bSwdenk to write it. 2801c609719bSwdenk 2802c609719bSwdenk* Do not use any unitialized global data (or implicitely initialized 2803c609719bSwdenk as zero data - BSS segment) at all - this is undefined, initiali- 2804c609719bSwdenk zation is performed later (when relocationg to RAM). 2805c609719bSwdenk 2806c609719bSwdenk* Stack space is very limited. Avoid big data buffers or things like 2807c609719bSwdenk that. 2808c609719bSwdenk 2809c609719bSwdenkHaving only the stack as writable memory limits means we cannot use 2810c609719bSwdenknormal global data to share information beween the code. But it 2811c609719bSwdenkturned out that the implementation of U-Boot can be greatly 2812c609719bSwdenksimplified by making a global data structure (gd_t) available to all 2813c609719bSwdenkfunctions. We could pass a pointer to this data as argument to _all_ 2814c609719bSwdenkfunctions, but this would bloat the code. Instead we use a feature of 2815c609719bSwdenkthe GCC compiler (Global Register Variables) to share the data: we 2816c609719bSwdenkplace a pointer (gd) to the global data into a register which we 2817c609719bSwdenkreserve for this purpose. 2818c609719bSwdenk 2819c609719bSwdenkWhen chosing a register for such a purpose we are restricted by the 2820c609719bSwdenkrelevant (E)ABI specifications for the current architecture, and by 2821c609719bSwdenkGCC's implementation. 2822c609719bSwdenk 2823c609719bSwdenkFor PowerPC, the following registers have specific use: 2824c609719bSwdenk R1: stack pointer 2825c609719bSwdenk R2: TOC pointer 2826c609719bSwdenk R3-R4: parameter passing and return values 2827c609719bSwdenk R5-R10: parameter passing 2828c609719bSwdenk R13: small data area pointer 2829c609719bSwdenk R30: GOT pointer 2830c609719bSwdenk R31: frame pointer 2831c609719bSwdenk 2832c609719bSwdenk (U-Boot also uses R14 as internal GOT pointer.) 2833c609719bSwdenk 2834c609719bSwdenk ==> U-Boot will use R29 to hold a pointer to the global data 2835c609719bSwdenk 2836c609719bSwdenk Note: on PPC, we could use a static initializer (since the 2837c609719bSwdenk address of the global data structure is known at compile time), 2838c609719bSwdenk but it turned out that reserving a register results in somewhat 2839c609719bSwdenk smaller code - although the code savings are not that big (on 2840c609719bSwdenk average for all boards 752 bytes for the whole U-Boot image, 2841c609719bSwdenk 624 text + 127 data). 2842c609719bSwdenk 2843c609719bSwdenkOn ARM, the following registers are used: 2844c609719bSwdenk 2845c609719bSwdenk R0: function argument word/integer result 2846c609719bSwdenk R1-R3: function argument word 2847c609719bSwdenk R9: GOT pointer 2848c609719bSwdenk R10: stack limit (used only if stack checking if enabled) 2849c609719bSwdenk R11: argument (frame) pointer 2850c609719bSwdenk R12: temporary workspace 2851c609719bSwdenk R13: stack pointer 2852c609719bSwdenk R14: link register 2853c609719bSwdenk R15: program counter 2854c609719bSwdenk 2855c609719bSwdenk ==> U-Boot will use R8 to hold a pointer to the global data 2856c609719bSwdenk 2857c609719bSwdenk 2858c609719bSwdenkMemory Management: 2859c609719bSwdenk------------------ 2860c609719bSwdenk 2861c609719bSwdenkU-Boot runs in system state and uses physical addresses, i.e. the 2862c609719bSwdenkMMU is not used either for address mapping nor for memory protection. 2863c609719bSwdenk 2864c609719bSwdenkThe available memory is mapped to fixed addresses using the memory 2865c609719bSwdenkcontroller. In this process, a contiguous block is formed for each 2866c609719bSwdenkmemory type (Flash, SDRAM, SRAM), even when it consists of several 2867c609719bSwdenkphysical memory banks. 2868c609719bSwdenk 2869c609719bSwdenkU-Boot is installed in the first 128 kB of the first Flash bank (on 2870c609719bSwdenkTQM8xxL modules this is the range 0x40000000 ... 0x4001FFFF). After 2871c609719bSwdenkbooting and sizing and initializing DRAM, the code relocates itself 2872c609719bSwdenkto the upper end of DRAM. Immediately below the U-Boot code some 2873c609719bSwdenkmemory is reserved for use by malloc() [see CFG_MALLOC_LEN 2874c609719bSwdenkconfiguration setting]. Below that, a structure with global Board 2875c609719bSwdenkInfo data is placed, followed by the stack (growing downward). 2876c609719bSwdenk 2877c609719bSwdenkAdditionally, some exception handler code is copied to the low 8 kB 2878c609719bSwdenkof DRAM (0x00000000 ... 0x00001FFF). 2879c609719bSwdenk 2880c609719bSwdenkSo a typical memory configuration with 16 MB of DRAM could look like 2881c609719bSwdenkthis: 2882c609719bSwdenk 2883c609719bSwdenk 0x0000 0000 Exception Vector code 2884c609719bSwdenk : 2885c609719bSwdenk 0x0000 1FFF 2886c609719bSwdenk 0x0000 2000 Free for Application Use 2887c609719bSwdenk : 2888c609719bSwdenk : 2889c609719bSwdenk 2890c609719bSwdenk : 2891c609719bSwdenk : 2892c609719bSwdenk 0x00FB FF20 Monitor Stack (Growing downward) 2893c609719bSwdenk 0x00FB FFAC Board Info Data and permanent copy of global data 2894c609719bSwdenk 0x00FC 0000 Malloc Arena 2895c609719bSwdenk : 2896c609719bSwdenk 0x00FD FFFF 2897c609719bSwdenk 0x00FE 0000 RAM Copy of Monitor Code 2898c609719bSwdenk ... eventually: LCD or video framebuffer 2899c609719bSwdenk ... eventually: pRAM (Protected RAM - unchanged by reset) 2900c609719bSwdenk 0x00FF FFFF [End of RAM] 2901c609719bSwdenk 2902c609719bSwdenk 2903c609719bSwdenkSystem Initialization: 2904c609719bSwdenk---------------------- 2905c609719bSwdenk 2906c609719bSwdenkIn the reset configuration, U-Boot starts at the reset entry point 2907c609719bSwdenk(on most PowerPC systens at address 0x00000100). Because of the reset 2908c609719bSwdenkconfiguration for CS0# this is a mirror of the onboard Flash memory. 2909c609719bSwdenkTo be able to re-map memory U-Boot then jumps to it's link address. 2910c609719bSwdenkTo be able to implement the initialization code in C, a (small!) 2911c609719bSwdenkinitial stack is set up in the internal Dual Ported RAM (in case CPUs 2912c609719bSwdenkwhich provide such a feature like MPC8xx or MPC8260), or in a locked 2913c609719bSwdenkpart of the data cache. After that, U-Boot initializes the CPU core, 2914c609719bSwdenkthe caches and the SIU. 2915c609719bSwdenk 2916c609719bSwdenkNext, all (potentially) available memory banks are mapped using a 2917c609719bSwdenkpreliminary mapping. For example, we put them on 512 MB boundaries 2918c609719bSwdenk(multiples of 0x20000000: SDRAM on 0x00000000 and 0x20000000, Flash 2919c609719bSwdenkon 0x40000000 and 0x60000000, SRAM on 0x80000000). Then UPM A is 2920c609719bSwdenkprogrammed for SDRAM access. Using the temporary configuration, a 2921c609719bSwdenksimple memory test is run that determines the size of the SDRAM 2922c609719bSwdenkbanks. 2923c609719bSwdenk 2924c609719bSwdenkWhen there is more than one SDRAM bank, and the banks are of 2925c609719bSwdenkdifferent size, the larger is mapped first. For equal size, the first 2926c609719bSwdenkbank (CS2#) is mapped first. The first mapping is always for address 2927c609719bSwdenk0x00000000, with any additional banks following immediately to create 2928c609719bSwdenkcontiguous memory starting from 0. 2929c609719bSwdenk 2930c609719bSwdenkThen, the monitor installs itself at the upper end of the SDRAM area 2931c609719bSwdenkand allocates memory for use by malloc() and for the global Board 2932c609719bSwdenkInfo data; also, the exception vector code is copied to the low RAM 2933c609719bSwdenkpages, and the final stack is set up. 2934c609719bSwdenk 2935c609719bSwdenkOnly after this relocation will you have a "normal" C environment; 2936c609719bSwdenkuntil that you are restricted in several ways, mostly because you are 2937c609719bSwdenkrunning from ROM, and because the code will have to be relocated to a 2938c609719bSwdenknew address in RAM. 2939c609719bSwdenk 2940c609719bSwdenk 2941c609719bSwdenkU-Boot Porting Guide: 2942c609719bSwdenk---------------------- 2943c609719bSwdenk 2944c609719bSwdenk[Based on messages by Jerry Van Baren in the U-Boot-Users mailing 29456aff3115Swdenklist, October 2002] 2946c609719bSwdenk 2947c609719bSwdenk 2948c609719bSwdenkint main (int argc, char *argv[]) 2949c609719bSwdenk{ 2950c609719bSwdenk sighandler_t no_more_time; 2951c609719bSwdenk 2952c609719bSwdenk signal (SIGALRM, no_more_time); 2953c609719bSwdenk alarm (PROJECT_DEADLINE - toSec (3 * WEEK)); 2954c609719bSwdenk 2955c609719bSwdenk if (available_money > available_manpower) { 2956c609719bSwdenk pay consultant to port U-Boot; 2957c609719bSwdenk return 0; 2958c609719bSwdenk } 2959c609719bSwdenk 2960c609719bSwdenk Download latest U-Boot source; 2961c609719bSwdenk 29626aff3115Swdenk Subscribe to u-boot-users mailing list; 29636aff3115Swdenk 2964c609719bSwdenk if (clueless) { 2965c609719bSwdenk email ("Hi, I am new to U-Boot, how do I get started?"); 2966c609719bSwdenk } 2967c609719bSwdenk 2968c609719bSwdenk while (learning) { 2969c609719bSwdenk Read the README file in the top level directory; 2970c609719bSwdenk Read http://www.denx.de/re/DPLG.html 2971c609719bSwdenk Read the source, Luke; 2972c609719bSwdenk } 2973c609719bSwdenk 2974c609719bSwdenk if (available_money > toLocalCurrency ($2500)) { 2975c609719bSwdenk Buy a BDI2000; 2976c609719bSwdenk } else { 2977c609719bSwdenk Add a lot of aggravation and time; 2978c609719bSwdenk } 2979c609719bSwdenk 2980c609719bSwdenk Create your own board support subdirectory; 2981c609719bSwdenk 29826aff3115Swdenk Create your own board config file; 29836aff3115Swdenk 2984c609719bSwdenk while (!running) { 2985c609719bSwdenk do { 2986c609719bSwdenk Add / modify source code; 2987c609719bSwdenk } until (compiles); 2988c609719bSwdenk Debug; 2989c609719bSwdenk if (clueless) 2990c609719bSwdenk email ("Hi, I am having problems..."); 2991c609719bSwdenk } 2992c609719bSwdenk Send patch file to Wolfgang; 2993c609719bSwdenk 2994c609719bSwdenk return 0; 2995c609719bSwdenk} 2996c609719bSwdenk 2997c609719bSwdenkvoid no_more_time (int sig) 2998c609719bSwdenk{ 2999c609719bSwdenk hire_a_guru(); 3000c609719bSwdenk} 3001c609719bSwdenk 3002c609719bSwdenk 3003c609719bSwdenkCoding Standards: 3004c609719bSwdenk----------------- 3005c609719bSwdenk 3006c609719bSwdenkAll contributions to U-Boot should conform to the Linux kernel 3007c609719bSwdenkcoding style; see the file "Documentation/CodingStyle" in your Linux 3008c609719bSwdenkkernel source directory. 3009c609719bSwdenk 3010c609719bSwdenkPlease note that U-Boot is implemented in C (and to some small parts 3011c609719bSwdenkin Assembler); no C++ is used, so please do not use C++ style 3012c609719bSwdenkcomments (//) in your code. 3013c609719bSwdenk 3014c609719bSwdenkSubmissions which do not conform to the standards may be returned 3015c609719bSwdenkwith a request to reformat the changes. 3016c609719bSwdenk 3017c609719bSwdenk 3018c609719bSwdenkSubmitting Patches: 3019c609719bSwdenk------------------- 3020c609719bSwdenk 3021c609719bSwdenkSince the number of patches for U-Boot is growing, we need to 3022c609719bSwdenkestablish some rules. Submissions which do not conform to these rules 3023c609719bSwdenkmay be rejected, even when they contain important and valuable stuff. 3024c609719bSwdenk 3025c609719bSwdenk 3026c609719bSwdenkWhen you send a patch, please include the following information with 3027c609719bSwdenkit: 3028c609719bSwdenk 3029c609719bSwdenk* For bug fixes: a description of the bug and how your patch fixes 3030c609719bSwdenk this bug. Please try to include a way of demonstrating that the 3031c609719bSwdenk patch actually fixes something. 3032c609719bSwdenk 3033c609719bSwdenk* For new features: a description of the feature and your 3034c609719bSwdenk implementation. 3035c609719bSwdenk 3036c609719bSwdenk* A CHANGELOG entry as plaintext (separate from the patch) 3037c609719bSwdenk 3038c609719bSwdenk* For major contributions, your entry to the CREDITS file 3039c609719bSwdenk 3040c609719bSwdenk* When you add support for a new board, don't forget to add this 3041c609719bSwdenk board to the MAKEALL script, too. 3042c609719bSwdenk 3043c609719bSwdenk* If your patch adds new configuration options, don't forget to 3044c609719bSwdenk document these in the README file. 3045c609719bSwdenk 3046c609719bSwdenk* The patch itself. If you are accessing the CVS repository use "cvs 3047c609719bSwdenk update; cvs diff -puRN"; else, use "diff -purN OLD NEW". If your 3048c609719bSwdenk version of diff does not support these options, then get the latest 3049c609719bSwdenk version of GNU diff. 3050c609719bSwdenk 3051*6dff5529Swdenk The current directory when running this command shall be the top 3052*6dff5529Swdenk level directory of the U-Boot source tree, or it's parent directory 3053*6dff5529Swdenk (i. e. please make sure that your patch includes sufficient 3054*6dff5529Swdenk directory information for the affected files). 3055*6dff5529Swdenk 3056c609719bSwdenk We accept patches as plain text, MIME attachments or as uuencoded 3057c609719bSwdenk gzipped text. 3058c609719bSwdenk 305952f52c14Swdenk* If one logical set of modifications affects or creates several 306052f52c14Swdenk files, all these changes shall be submitted in a SINGLE patch file. 306152f52c14Swdenk 306252f52c14Swdenk* Changesets that contain different, unrelated modifications shall be 306352f52c14Swdenk submitted as SEPARATE patches, one patch per changeset. 306452f52c14Swdenk 306552f52c14Swdenk 3066c609719bSwdenkNotes: 3067c609719bSwdenk 3068c609719bSwdenk* Before sending the patch, run the MAKEALL script on your patched 3069c609719bSwdenk source tree and make sure that no errors or warnings are reported 3070c609719bSwdenk for any of the boards. 3071c609719bSwdenk 3072c609719bSwdenk* Keep your modifications to the necessary minimum: A patch 3073c609719bSwdenk containing several unrelated changes or arbitrary reformats will be 3074c609719bSwdenk returned with a request to re-formatting / split it. 3075c609719bSwdenk 3076c609719bSwdenk* If you modify existing code, make sure that your new code does not 3077c609719bSwdenk add to the memory footprint of the code ;-) Small is beautiful! 3078c609719bSwdenk When adding new features, these should compile conditionally only 3079c609719bSwdenk (using #ifdef), and the resulting code with the new feature 3080c609719bSwdenk disabled must not need more memory than the old code without your 3081c609719bSwdenk modification. 3082