1c609719bSwdenk# 26abe6fb6SDetlev Zundel# (C) Copyright 2000 - 2011 3c609719bSwdenk# Wolfgang Denk, DENX Software Engineering, wd@denx.de. 4c609719bSwdenk# 5c609719bSwdenk# See file CREDITS for list of people who contributed to this 6c609719bSwdenk# project. 7c609719bSwdenk# 8c609719bSwdenk# This program is free software; you can redistribute it and/or 9c609719bSwdenk# modify it under the terms of the GNU General Public License as 10c609719bSwdenk# published by the Free Software Foundation; either version 2 of 11c609719bSwdenk# the License, or (at your option) any later version. 12c609719bSwdenk# 13c609719bSwdenk# This program is distributed in the hope that it will be useful, 14c609719bSwdenk# but WITHOUT ANY WARRANTY; without even the implied warranty of 15c609719bSwdenk# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16c609719bSwdenk# GNU General Public License for more details. 17c609719bSwdenk# 18c609719bSwdenk# You should have received a copy of the GNU General Public License 19c609719bSwdenk# along with this program; if not, write to the Free Software 20c609719bSwdenk# Foundation, Inc., 59 Temple Place, Suite 330, Boston, 21c609719bSwdenk# MA 02111-1307 USA 22c609719bSwdenk# 23c609719bSwdenk 24c609719bSwdenkSummary: 25c609719bSwdenk======== 26c609719bSwdenk 2724ee89b9SwdenkThis directory contains the source code for U-Boot, a boot loader for 28e86e5a07SwdenkEmbedded boards based on PowerPC, ARM, MIPS and several other 29e86e5a07Swdenkprocessors, which can be installed in a boot ROM and used to 30e86e5a07Swdenkinitialize and test the hardware or to download and run application 31e86e5a07Swdenkcode. 32c609719bSwdenk 33c609719bSwdenkThe development of U-Boot is closely related to Linux: some parts of 3424ee89b9Swdenkthe source code originate in the Linux source tree, we have some 3524ee89b9Swdenkheader files in common, and special provision has been made to 36c609719bSwdenksupport booting of Linux images. 37c609719bSwdenk 38c609719bSwdenkSome attention has been paid to make this software easily 39c609719bSwdenkconfigurable and extendable. For instance, all monitor commands are 40c609719bSwdenkimplemented with the same call interface, so that it's very easy to 41c609719bSwdenkadd new commands. Also, instead of permanently adding rarely used 42c609719bSwdenkcode (for instance hardware test utilities) to the monitor, you can 43c609719bSwdenkload and run it dynamically. 44c609719bSwdenk 45c609719bSwdenk 46c609719bSwdenkStatus: 47c609719bSwdenk======= 48c609719bSwdenk 49c609719bSwdenkIn general, all boards for which a configuration option exists in the 50c609719bSwdenkMakefile have been tested to some extent and can be considered 51c609719bSwdenk"working". In fact, many of them are used in production systems. 52c609719bSwdenk 53c609719bSwdenkIn case of problems see the CHANGELOG and CREDITS files to find out 54218ca724SWolfgang Denkwho contributed the specific port. The MAINTAINERS file lists board 55218ca724SWolfgang Denkmaintainers. 56c609719bSwdenk 57c609719bSwdenk 58c609719bSwdenkWhere to get help: 59c609719bSwdenk================== 60c609719bSwdenk 61c609719bSwdenkIn case you have questions about, problems with or contributions for 62c609719bSwdenkU-Boot you should send a message to the U-Boot mailing list at 630c32565fSPeter Tyser<u-boot@lists.denx.de>. There is also an archive of previous traffic 640c32565fSPeter Tyseron the mailing list - please search the archive before asking FAQ's. 650c32565fSPeter TyserPlease see http://lists.denx.de/pipermail/u-boot and 660c32565fSPeter Tyserhttp://dir.gmane.org/gmane.comp.boot-loaders.u-boot 67c609719bSwdenk 68c609719bSwdenk 69218ca724SWolfgang DenkWhere to get source code: 70218ca724SWolfgang Denk========================= 71218ca724SWolfgang Denk 72218ca724SWolfgang DenkThe U-Boot source code is maintained in the git repository at 73218ca724SWolfgang Denkgit://www.denx.de/git/u-boot.git ; you can browse it online at 74218ca724SWolfgang Denkhttp://www.denx.de/cgi-bin/gitweb.cgi?p=u-boot.git;a=summary 75218ca724SWolfgang Denk 76218ca724SWolfgang DenkThe "snapshot" links on this page allow you to download tarballs of 7711ccc33fSMarcel Ziswilerany version you might be interested in. Official releases are also 78218ca724SWolfgang Denkavailable for FTP download from the ftp://ftp.denx.de/pub/u-boot/ 79218ca724SWolfgang Denkdirectory. 80218ca724SWolfgang Denk 81d4ee711dSAnatolij GustschinPre-built (and tested) images are available from 82218ca724SWolfgang Denkftp://ftp.denx.de/pub/u-boot/images/ 83218ca724SWolfgang Denk 84218ca724SWolfgang Denk 85c609719bSwdenkWhere we come from: 86c609719bSwdenk=================== 87c609719bSwdenk 88c609719bSwdenk- start from 8xxrom sources 8924ee89b9Swdenk- create PPCBoot project (http://sourceforge.net/projects/ppcboot) 90c609719bSwdenk- clean up code 91c609719bSwdenk- make it easier to add custom boards 92c609719bSwdenk- make it possible to add other [PowerPC] CPUs 93c609719bSwdenk- extend functions, especially: 94c609719bSwdenk * Provide extended interface to Linux boot loader 95c609719bSwdenk * S-Record download 96c609719bSwdenk * network boot 9711ccc33fSMarcel Ziswiler * PCMCIA / CompactFlash / ATA disk / SCSI ... boot 9824ee89b9Swdenk- create ARMBoot project (http://sourceforge.net/projects/armboot) 99c609719bSwdenk- add other CPU families (starting with ARM) 10024ee89b9Swdenk- create U-Boot project (http://sourceforge.net/projects/u-boot) 1010d28f34bSMagnus Lilja- current project page: see http://www.denx.de/wiki/U-Boot 10224ee89b9Swdenk 10324ee89b9Swdenk 10424ee89b9SwdenkNames and Spelling: 10524ee89b9Swdenk=================== 10624ee89b9Swdenk 10724ee89b9SwdenkThe "official" name of this project is "Das U-Boot". The spelling 10824ee89b9Swdenk"U-Boot" shall be used in all written text (documentation, comments 10924ee89b9Swdenkin source files etc.). Example: 11024ee89b9Swdenk 11124ee89b9Swdenk This is the README file for the U-Boot project. 11224ee89b9Swdenk 11324ee89b9SwdenkFile names etc. shall be based on the string "u-boot". Examples: 11424ee89b9Swdenk 11524ee89b9Swdenk include/asm-ppc/u-boot.h 11624ee89b9Swdenk 11724ee89b9Swdenk #include <asm/u-boot.h> 11824ee89b9Swdenk 11924ee89b9SwdenkVariable names, preprocessor constants etc. shall be either based on 12024ee89b9Swdenkthe string "u_boot" or on "U_BOOT". Example: 12124ee89b9Swdenk 12224ee89b9Swdenk U_BOOT_VERSION u_boot_logo 12324ee89b9Swdenk IH_OS_U_BOOT u_boot_hush_start 124c609719bSwdenk 125c609719bSwdenk 12693f19cc0SwdenkVersioning: 12793f19cc0Swdenk=========== 12893f19cc0Swdenk 129360d883aSThomas WeberStarting with the release in October 2008, the names of the releases 130360d883aSThomas Weberwere changed from numerical release numbers without deeper meaning 131360d883aSThomas Weberinto a time stamp based numbering. Regular releases are identified by 132360d883aSThomas Webernames consisting of the calendar year and month of the release date. 133360d883aSThomas WeberAdditional fields (if present) indicate release candidates or bug fix 134360d883aSThomas Weberreleases in "stable" maintenance trees. 13593f19cc0Swdenk 136360d883aSThomas WeberExamples: 137360d883aSThomas Weber U-Boot v2009.11 - Release November 2009 138360d883aSThomas Weber U-Boot v2009.11.1 - Release 1 in version November 2009 stable tree 139360d883aSThomas Weber U-Boot v2010.09-rc1 - Release candiate 1 for September 2010 release 14093f19cc0Swdenk 14193f19cc0Swdenk 142c609719bSwdenkDirectory Hierarchy: 143c609719bSwdenk==================== 144c609719bSwdenk 1458d321b81SPeter Tyser/arch Architecture specific files 1468d321b81SPeter Tyser /arm Files generic to ARM architecture 1478d321b81SPeter Tyser /cpu CPU specific files 1488d321b81SPeter Tyser /arm720t Files specific to ARM 720 CPUs 1498d321b81SPeter Tyser /arm920t Files specific to ARM 920 CPUs 1506eb0921aSAndreas Bießmann /at91 Files specific to Atmel AT91RM9200 CPU 1518d321b81SPeter Tyser /imx Files specific to Freescale MC9328 i.MX CPUs 1528d321b81SPeter Tyser /s3c24x0 Files specific to Samsung S3C24X0 CPUs 1538d321b81SPeter Tyser /arm925t Files specific to ARM 925 CPUs 1548d321b81SPeter Tyser /arm926ejs Files specific to ARM 926 CPUs 1558d321b81SPeter Tyser /arm1136 Files specific to ARM 1136 CPUs 1568d321b81SPeter Tyser /ixp Files specific to Intel XScale IXP CPUs 1578d321b81SPeter Tyser /pxa Files specific to Intel XScale PXA CPUs 1588d321b81SPeter Tyser /s3c44b0 Files specific to Samsung S3C44B0 CPUs 1598d321b81SPeter Tyser /sa1100 Files specific to Intel StrongARM SA1100 CPUs 1608d321b81SPeter Tyser /lib Architecture specific library files 1618d321b81SPeter Tyser /avr32 Files generic to AVR32 architecture 1628d321b81SPeter Tyser /cpu CPU specific files 1638d321b81SPeter Tyser /lib Architecture specific library files 1648d321b81SPeter Tyser /blackfin Files generic to Analog Devices Blackfin architecture 1658d321b81SPeter Tyser /cpu CPU specific files 1668d321b81SPeter Tyser /lib Architecture specific library files 167fea25720SGraeme Russ /x86 Files generic to x86 architecture 1688d321b81SPeter Tyser /cpu CPU specific files 1698d321b81SPeter Tyser /lib Architecture specific library files 1708d321b81SPeter Tyser /m68k Files generic to m68k architecture 1718d321b81SPeter Tyser /cpu CPU specific files 1728d321b81SPeter Tyser /mcf52x2 Files specific to Freescale ColdFire MCF52x2 CPUs 1738d321b81SPeter Tyser /mcf5227x Files specific to Freescale ColdFire MCF5227x CPUs 1748d321b81SPeter Tyser /mcf532x Files specific to Freescale ColdFire MCF5329 CPUs 1758d321b81SPeter Tyser /mcf5445x Files specific to Freescale ColdFire MCF5445x CPUs 1768d321b81SPeter Tyser /mcf547x_8x Files specific to Freescale ColdFire MCF547x_8x CPUs 1778d321b81SPeter Tyser /lib Architecture specific library files 1788d321b81SPeter Tyser /microblaze Files generic to microblaze architecture 1798d321b81SPeter Tyser /cpu CPU specific files 1808d321b81SPeter Tyser /lib Architecture specific library files 1818d321b81SPeter Tyser /mips Files generic to MIPS architecture 1828d321b81SPeter Tyser /cpu CPU specific files 18392bbd64eSDaniel Schwierzeck /mips32 Files specific to MIPS32 CPUs 18480421fccSXiangfu Liu /xburst Files specific to Ingenic XBurst CPUs 1858d321b81SPeter Tyser /lib Architecture specific library files 186*afc1ce82SMacpaul Lin /nds32 Files generic to NDS32 architecture 187*afc1ce82SMacpaul Lin /cpu CPU specific files 188*afc1ce82SMacpaul Lin /n1213 Files specific to Andes Technology N1213 CPUs 189*afc1ce82SMacpaul Lin /lib Architecture specific library files 1908d321b81SPeter Tyser /nios2 Files generic to Altera NIOS2 architecture 1918d321b81SPeter Tyser /cpu CPU specific files 1928d321b81SPeter Tyser /lib Architecture specific library files 193a47a12beSStefan Roese /powerpc Files generic to PowerPC architecture 1948d321b81SPeter Tyser /cpu CPU specific files 1958d321b81SPeter Tyser /74xx_7xx Files specific to Freescale MPC74xx and 7xx CPUs 1968d321b81SPeter Tyser /mpc5xx Files specific to Freescale MPC5xx CPUs 1978d321b81SPeter Tyser /mpc5xxx Files specific to Freescale MPC5xxx CPUs 1988d321b81SPeter Tyser /mpc8xx Files specific to Freescale MPC8xx CPUs 1998d321b81SPeter Tyser /mpc8220 Files specific to Freescale MPC8220 CPUs 2008d321b81SPeter Tyser /mpc824x Files specific to Freescale MPC824x CPUs 2018d321b81SPeter Tyser /mpc8260 Files specific to Freescale MPC8260 CPUs 2028d321b81SPeter Tyser /mpc85xx Files specific to Freescale MPC85xx CPUs 2038d321b81SPeter Tyser /ppc4xx Files specific to AMCC PowerPC 4xx CPUs 2048d321b81SPeter Tyser /lib Architecture specific library files 2058d321b81SPeter Tyser /sh Files generic to SH architecture 2068d321b81SPeter Tyser /cpu CPU specific files 2078d321b81SPeter Tyser /sh2 Files specific to sh2 CPUs 2088d321b81SPeter Tyser /sh3 Files specific to sh3 CPUs 2098d321b81SPeter Tyser /sh4 Files specific to sh4 CPUs 2108d321b81SPeter Tyser /lib Architecture specific library files 2118d321b81SPeter Tyser /sparc Files generic to SPARC architecture 2128d321b81SPeter Tyser /cpu CPU specific files 2138d321b81SPeter Tyser /leon2 Files specific to Gaisler LEON2 SPARC CPU 2148d321b81SPeter Tyser /leon3 Files specific to Gaisler LEON3 SPARC CPU 2158d321b81SPeter Tyser /lib Architecture specific library files 2168d321b81SPeter Tyser/api Machine/arch independent API for external apps 2178d321b81SPeter Tyser/board Board dependent files 2188d321b81SPeter Tyser/common Misc architecture independent functions 2198d321b81SPeter Tyser/disk Code for disk drive partition handling 2208d321b81SPeter Tyser/doc Documentation (don't expect too much) 2218d321b81SPeter Tyser/drivers Commonly used device drivers 2228d321b81SPeter Tyser/examples Example code for standalone applications, etc. 2238d321b81SPeter Tyser/fs Filesystem code (cramfs, ext2, jffs2, etc.) 2248d321b81SPeter Tyser/include Header Files 2258d321b81SPeter Tyser/lib Files generic to all architectures 2268d321b81SPeter Tyser /libfdt Library files to support flattened device trees 2278d321b81SPeter Tyser /lzma Library files to support LZMA decompression 2288d321b81SPeter Tyser /lzo Library files to support LZO decompression 2298d321b81SPeter Tyser/net Networking code 2308d321b81SPeter Tyser/post Power On Self Test 2318d321b81SPeter Tyser/rtc Real Time Clock drivers 2328d321b81SPeter Tyser/tools Tools to build S-Record or U-Boot images, etc. 233c609719bSwdenk 234c609719bSwdenkSoftware Configuration: 235c609719bSwdenk======================= 236c609719bSwdenk 237c609719bSwdenkConfiguration is usually done using C preprocessor defines; the 238c609719bSwdenkrationale behind that is to avoid dead code whenever possible. 239c609719bSwdenk 240c609719bSwdenkThere are two classes of configuration variables: 241c609719bSwdenk 242c609719bSwdenk* Configuration _OPTIONS_: 243c609719bSwdenk These are selectable by the user and have names beginning with 244c609719bSwdenk "CONFIG_". 245c609719bSwdenk 246c609719bSwdenk* Configuration _SETTINGS_: 247c609719bSwdenk These depend on the hardware etc. and should not be meddled with if 248c609719bSwdenk you don't know what you're doing; they have names beginning with 2496d0f6bcfSJean-Christophe PLAGNIOL-VILLARD "CONFIG_SYS_". 250c609719bSwdenk 251c609719bSwdenkLater we will add a configuration tool - probably similar to or even 252c609719bSwdenkidentical to what's used for the Linux kernel. Right now, we have to 253c609719bSwdenkdo the configuration by hand, which means creating some symbolic 254c609719bSwdenklinks and editing some configuration files. We use the TQM8xxL boards 255c609719bSwdenkas an example here. 256c609719bSwdenk 257c609719bSwdenk 258c609719bSwdenkSelection of Processor Architecture and Board Type: 259c609719bSwdenk--------------------------------------------------- 260c609719bSwdenk 261c609719bSwdenkFor all supported boards there are ready-to-use default 262c609719bSwdenkconfigurations available; just type "make <board_name>_config". 263c609719bSwdenk 264c609719bSwdenkExample: For a TQM823L module type: 265c609719bSwdenk 266c609719bSwdenk cd u-boot 267c609719bSwdenk make TQM823L_config 268c609719bSwdenk 26911ccc33fSMarcel ZiswilerFor the Cogent platform, you need to specify the CPU type as well; 270c609719bSwdenke.g. "make cogent_mpc8xx_config". And also configure the cogent 271c609719bSwdenkdirectory according to the instructions in cogent/README. 272c609719bSwdenk 273c609719bSwdenk 274c609719bSwdenkConfiguration Options: 275c609719bSwdenk---------------------- 276c609719bSwdenk 277c609719bSwdenkConfiguration depends on the combination of board and CPU type; all 278c609719bSwdenksuch information is kept in a configuration file 279c609719bSwdenk"include/configs/<board_name>.h". 280c609719bSwdenk 281c609719bSwdenkExample: For a TQM823L module, all configuration settings are in 282c609719bSwdenk"include/configs/TQM823L.h". 283c609719bSwdenk 284c609719bSwdenk 2857f6c2cbcSwdenkMany of the options are named exactly as the corresponding Linux 2867f6c2cbcSwdenkkernel configuration options. The intention is to make it easier to 2877f6c2cbcSwdenkbuild a config tool - later. 2887f6c2cbcSwdenk 2897f6c2cbcSwdenk 290c609719bSwdenkThe following options need to be configured: 291c609719bSwdenk 2922628114eSKim Phillips- CPU Type: Define exactly one, e.g. CONFIG_MPC85XX. 293c609719bSwdenk 2942628114eSKim Phillips- Board Type: Define exactly one, e.g. CONFIG_MPC8540ADS. 2956ccec449SWolfgang Denk 2966ccec449SWolfgang Denk- CPU Daughterboard Type: (if CONFIG_ATSTK1000 is defined) 29709ea0de0SHaavard Skinnemoen Define exactly one, e.g. CONFIG_ATSTK1002 298c609719bSwdenk 299c609719bSwdenk- CPU Module Type: (if CONFIG_COGENT is defined) 300c609719bSwdenk Define exactly one of 301c609719bSwdenk CONFIG_CMA286_60_OLD 302c609719bSwdenk--- FIXME --- not tested yet: 303c609719bSwdenk CONFIG_CMA286_60, CONFIG_CMA286_21, CONFIG_CMA286_60P, 304c609719bSwdenk CONFIG_CMA287_23, CONFIG_CMA287_50 305c609719bSwdenk 306c609719bSwdenk- Motherboard Type: (if CONFIG_COGENT is defined) 307c609719bSwdenk Define exactly one of 308c609719bSwdenk CONFIG_CMA101, CONFIG_CMA102 309c609719bSwdenk 310c609719bSwdenk- Motherboard I/O Modules: (if CONFIG_COGENT is defined) 311c609719bSwdenk Define one or more of 312c609719bSwdenk CONFIG_CMA302 313c609719bSwdenk 314c609719bSwdenk- Motherboard Options: (if CONFIG_CMA101 or CONFIG_CMA102 are defined) 315c609719bSwdenk Define one or more of 316c609719bSwdenk CONFIG_LCD_HEARTBEAT - update a character position on 31711ccc33fSMarcel Ziswiler the LCD display every second with 318c609719bSwdenk a "rotator" |\-/|\-/ 319c609719bSwdenk 3202535d602Swdenk- Board flavour: (if CONFIG_MPC8260ADS is defined) 3212535d602Swdenk CONFIG_ADSTYPE 3222535d602Swdenk Possible values are: 3236d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_8260ADS - original MPC8260ADS 3246d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_8266ADS - MPC8266ADS 3256d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_PQ2FADS - PQ2FADS-ZU or PQ2FADS-VR 3266d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_8272ADS - MPC8272ADS 3272535d602Swdenk 328cf946c6dSLei Wen- Marvell Family Member 329cf946c6dSLei Wen CONFIG_SYS_MVFS - define it if you want to enable 330cf946c6dSLei Wen multiple fs option at one time 331cf946c6dSLei Wen for marvell soc family 332cf946c6dSLei Wen 333c609719bSwdenk- MPC824X Family Member (if CONFIG_MPC824X is defined) 334c609719bSwdenk Define exactly one of 335c609719bSwdenk CONFIG_MPC8240, CONFIG_MPC8245 336c609719bSwdenk 33711ccc33fSMarcel Ziswiler- 8xx CPU Options: (if using an MPC8xx CPU) 33866ca92a5Swdenk CONFIG_8xx_GCLK_FREQ - deprecated: CPU clock if 33966ca92a5Swdenk get_gclk_freq() cannot work 3405da627a4Swdenk e.g. if there is no 32KHz 3415da627a4Swdenk reference PIT/RTC clock 34266ca92a5Swdenk CONFIG_8xx_OSCLK - PLL input clock (either EXTCLK 34366ca92a5Swdenk or XTAL/EXTAL) 344c609719bSwdenk 34566ca92a5Swdenk- 859/866/885 CPU options: (if using a MPC859 or MPC866 or MPC885 CPU): 3466d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_8xx_CPUCLK_MIN 3476d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_8xx_CPUCLK_MAX 34866ca92a5Swdenk CONFIG_8xx_CPUCLK_DEFAULT 34975d1ea7fSwdenk See doc/README.MPC866 35075d1ea7fSwdenk 3516d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_MEASURE_CPUCLK 35275d1ea7fSwdenk 35375d1ea7fSwdenk Define this to measure the actual CPU clock instead 35475d1ea7fSwdenk of relying on the correctness of the configured 35575d1ea7fSwdenk values. Mostly useful for board bringup to make sure 35675d1ea7fSwdenk the PLL is locked at the intended frequency. Note 35775d1ea7fSwdenk that this requires a (stable) reference clock (32 kHz 3586d0f6bcfSJean-Christophe PLAGNIOL-VILLARD RTC clock or CONFIG_SYS_8XX_XIN) 35975d1ea7fSwdenk 360506f3918SHeiko Schocher CONFIG_SYS_DELAYED_ICACHE 361506f3918SHeiko Schocher 362506f3918SHeiko Schocher Define this option if you want to enable the 363506f3918SHeiko Schocher ICache only when Code runs from RAM. 364506f3918SHeiko Schocher 36566412c63SKumar Gala- 85xx CPU Options: 36666412c63SKumar Gala CONFIG_SYS_FSL_TBCLK_DIV 36766412c63SKumar Gala 36866412c63SKumar Gala Defines the core time base clock divider ratio compared to the 36966412c63SKumar Gala system clock. On most PQ3 devices this is 8, on newer QorIQ 37066412c63SKumar Gala devices it can be 16 or 32. The ratio varies from SoC to Soc. 37166412c63SKumar Gala 3728f29084aSKumar Gala CONFIG_SYS_FSL_PCIE_COMPAT 3738f29084aSKumar Gala 3748f29084aSKumar Gala Defines the string to utilize when trying to match PCIe device 3758f29084aSKumar Gala tree nodes for the given platform. 3768f29084aSKumar Gala 3770b953ffcSMarkus Klotzbuecher- Intel Monahans options: 3786d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_MONAHANS_RUN_MODE_OSC_RATIO 3790b953ffcSMarkus Klotzbuecher 3800b953ffcSMarkus Klotzbuecher Defines the Monahans run mode to oscillator 3810b953ffcSMarkus Klotzbuecher ratio. Valid values are 8, 16, 24, 31. The core 3820b953ffcSMarkus Klotzbuecher frequency is this value multiplied by 13 MHz. 3830b953ffcSMarkus Klotzbuecher 3846d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_MONAHANS_TURBO_RUN_MODE_RATIO 3850b953ffcSMarkus Klotzbuecher 3860b953ffcSMarkus Klotzbuecher Defines the Monahans turbo mode to oscillator 3870b953ffcSMarkus Klotzbuecher ratio. Valid values are 1 (default if undefined) and 3880b953ffcSMarkus Klotzbuecher 2. The core frequency as calculated above is multiplied 3890b953ffcSMarkus Klotzbuecher by this value. 3900b953ffcSMarkus Klotzbuecher 39192bbd64eSDaniel Schwierzeck- MIPS CPU options: 39292bbd64eSDaniel Schwierzeck CONFIG_SYS_INIT_SP_OFFSET 39392bbd64eSDaniel Schwierzeck 39492bbd64eSDaniel Schwierzeck Offset relative to CONFIG_SYS_SDRAM_BASE for initial stack 39592bbd64eSDaniel Schwierzeck pointer. This is needed for the temporary stack before 39692bbd64eSDaniel Schwierzeck relocation. 39792bbd64eSDaniel Schwierzeck 39892bbd64eSDaniel Schwierzeck CONFIG_SYS_MIPS_CACHE_MODE 39992bbd64eSDaniel Schwierzeck 40092bbd64eSDaniel Schwierzeck Cache operation mode for the MIPS CPU. 40192bbd64eSDaniel Schwierzeck See also arch/mips/include/asm/mipsregs.h. 40292bbd64eSDaniel Schwierzeck Possible values are: 40392bbd64eSDaniel Schwierzeck CONF_CM_CACHABLE_NO_WA 40492bbd64eSDaniel Schwierzeck CONF_CM_CACHABLE_WA 40592bbd64eSDaniel Schwierzeck CONF_CM_UNCACHED 40692bbd64eSDaniel Schwierzeck CONF_CM_CACHABLE_NONCOHERENT 40792bbd64eSDaniel Schwierzeck CONF_CM_CACHABLE_CE 40892bbd64eSDaniel Schwierzeck CONF_CM_CACHABLE_COW 40992bbd64eSDaniel Schwierzeck CONF_CM_CACHABLE_CUW 41092bbd64eSDaniel Schwierzeck CONF_CM_CACHABLE_ACCELERATED 41192bbd64eSDaniel Schwierzeck 41292bbd64eSDaniel Schwierzeck CONFIG_SYS_XWAY_EBU_BOOTCFG 41392bbd64eSDaniel Schwierzeck 41492bbd64eSDaniel Schwierzeck Special option for Lantiq XWAY SoCs for booting from NOR flash. 41592bbd64eSDaniel Schwierzeck See also arch/mips/cpu/mips32/start.S. 41692bbd64eSDaniel Schwierzeck 41792bbd64eSDaniel Schwierzeck CONFIG_XWAY_SWAP_BYTES 41892bbd64eSDaniel Schwierzeck 41992bbd64eSDaniel Schwierzeck Enable compilation of tools/xway-swap-bytes needed for Lantiq 42092bbd64eSDaniel Schwierzeck XWAY SoCs for booting from NOR flash. The U-Boot image needs to 42192bbd64eSDaniel Schwierzeck be swapped if a flash programmer is used. 42292bbd64eSDaniel Schwierzeck 4235da627a4Swdenk- Linux Kernel Interface: 424c609719bSwdenk CONFIG_CLOCKS_IN_MHZ 425c609719bSwdenk 426c609719bSwdenk U-Boot stores all clock information in Hz 427c609719bSwdenk internally. For binary compatibility with older Linux 428c609719bSwdenk kernels (which expect the clocks passed in the 429c609719bSwdenk bd_info data to be in MHz) the environment variable 430c609719bSwdenk "clocks_in_mhz" can be defined so that U-Boot 431c609719bSwdenk converts clock data to MHZ before passing it to the 432c609719bSwdenk Linux kernel. 433c609719bSwdenk When CONFIG_CLOCKS_IN_MHZ is defined, a definition of 434c609719bSwdenk "clocks_in_mhz=1" is automatically included in the 435c609719bSwdenk default environment. 436c609719bSwdenk 4375da627a4Swdenk CONFIG_MEMSIZE_IN_BYTES [relevant for MIPS only] 4385da627a4Swdenk 43911ccc33fSMarcel Ziswiler When transferring memsize parameter to linux, some versions 4405da627a4Swdenk expect it to be in bytes, others in MB. 4415da627a4Swdenk Define CONFIG_MEMSIZE_IN_BYTES to make it in bytes. 4425da627a4Swdenk 443fec6d9eeSGerald Van Baren CONFIG_OF_LIBFDT 444f57f70aaSWolfgang Denk 445f57f70aaSWolfgang Denk New kernel versions are expecting firmware settings to be 446213bf8c8SGerald Van Baren passed using flattened device trees (based on open firmware 447213bf8c8SGerald Van Baren concepts). 448213bf8c8SGerald Van Baren 449213bf8c8SGerald Van Baren CONFIG_OF_LIBFDT 450213bf8c8SGerald Van Baren * New libfdt-based support 451213bf8c8SGerald Van Baren * Adds the "fdt" command 4523bb342fcSKim Phillips * The bootm command automatically updates the fdt 453213bf8c8SGerald Van Baren 454b55ae402SMarcel Ziswiler OF_CPU - The proper name of the cpus node (only required for 455b55ae402SMarcel Ziswiler MPC512X and MPC5xxx based boards). 456b55ae402SMarcel Ziswiler OF_SOC - The proper name of the soc node (only required for 457b55ae402SMarcel Ziswiler MPC512X and MPC5xxx based boards). 458f57f70aaSWolfgang Denk OF_TBCLK - The timebase frequency. 459c2871f03SKumar Gala OF_STDOUT_PATH - The path to the console device 460f57f70aaSWolfgang Denk 46111ccc33fSMarcel Ziswiler boards with QUICC Engines require OF_QE to set UCC MAC 46211ccc33fSMarcel Ziswiler addresses 4633bb342fcSKim Phillips 4644e253137SKumar Gala CONFIG_OF_BOARD_SETUP 4654e253137SKumar Gala 4664e253137SKumar Gala Board code has addition modification that it wants to make 4674e253137SKumar Gala to the flat device tree before handing it off to the kernel 4686705d81eSwdenk 4690267768eSMatthew McClintock CONFIG_OF_BOOT_CPU 4700267768eSMatthew McClintock 47111ccc33fSMarcel Ziswiler This define fills in the correct boot CPU in the boot 4720267768eSMatthew McClintock param header, the default value is zero if undefined. 4730267768eSMatthew McClintock 4743887c3fbSHeiko Schocher CONFIG_OF_IDE_FIXUP 4753887c3fbSHeiko Schocher 4763887c3fbSHeiko Schocher U-Boot can detect if an IDE device is present or not. 4773887c3fbSHeiko Schocher If not, and this new config option is activated, U-Boot 4783887c3fbSHeiko Schocher removes the ATA node from the DTS before booting Linux, 4793887c3fbSHeiko Schocher so the Linux IDE driver does not probe the device and 4803887c3fbSHeiko Schocher crash. This is needed for buggy hardware (uc101) where 4813887c3fbSHeiko Schocher no pull down resistor is connected to the signal IDE5V_DD7. 4823887c3fbSHeiko Schocher 4837eb29398SIgor Grinberg CONFIG_MACH_TYPE [relevant for ARM only][mandatory] 4847eb29398SIgor Grinberg 4857eb29398SIgor Grinberg This setting is mandatory for all boards that have only one 4867eb29398SIgor Grinberg machine type and must be used to specify the machine type 4877eb29398SIgor Grinberg number as it appears in the ARM machine registry 4887eb29398SIgor Grinberg (see http://www.arm.linux.org.uk/developer/machines/). 4897eb29398SIgor Grinberg Only boards that have multiple machine types supported 4907eb29398SIgor Grinberg in a single configuration file and the machine type is 4917eb29398SIgor Grinberg runtime discoverable, do not have to use this setting. 4927eb29398SIgor Grinberg 4930b2f4ecaSNiklaus Giger- vxWorks boot parameters: 4940b2f4ecaSNiklaus Giger 4950b2f4ecaSNiklaus Giger bootvx constructs a valid bootline using the following 4960b2f4ecaSNiklaus Giger environments variables: bootfile, ipaddr, serverip, hostname. 4970b2f4ecaSNiklaus Giger It loads the vxWorks image pointed bootfile. 4980b2f4ecaSNiklaus Giger 4990b2f4ecaSNiklaus Giger CONFIG_SYS_VXWORKS_BOOT_DEVICE - The vxworks device name 5000b2f4ecaSNiklaus Giger CONFIG_SYS_VXWORKS_MAC_PTR - Ethernet 6 byte MA -address 5010b2f4ecaSNiklaus Giger CONFIG_SYS_VXWORKS_SERVERNAME - Name of the server 5020b2f4ecaSNiklaus Giger CONFIG_SYS_VXWORKS_BOOT_ADDR - Address of boot parameters 5030b2f4ecaSNiklaus Giger 5040b2f4ecaSNiklaus Giger CONFIG_SYS_VXWORKS_ADD_PARAMS 5050b2f4ecaSNiklaus Giger 5060b2f4ecaSNiklaus Giger Add it at the end of the bootline. E.g "u=username pw=secret" 5070b2f4ecaSNiklaus Giger 5080b2f4ecaSNiklaus Giger Note: If a "bootargs" environment is defined, it will overwride 5090b2f4ecaSNiklaus Giger the defaults discussed just above. 5100b2f4ecaSNiklaus Giger 5112c451f78SAneesh V- Cache Configuration: 5122c451f78SAneesh V CONFIG_SYS_ICACHE_OFF - Do not enable instruction cache in U-Boot 5132c451f78SAneesh V CONFIG_SYS_DCACHE_OFF - Do not enable data cache in U-Boot 5142c451f78SAneesh V CONFIG_SYS_L2CACHE_OFF- Do not enable L2 cache in U-Boot 5152c451f78SAneesh V 51693bc2193SAneesh V- Cache Configuration for ARM: 51793bc2193SAneesh V CONFIG_SYS_L2_PL310 - Enable support for ARM PL310 L2 cache 51893bc2193SAneesh V controller 51993bc2193SAneesh V CONFIG_SYS_PL310_BASE - Physical base address of PL310 52093bc2193SAneesh V controller register space 52193bc2193SAneesh V 5226705d81eSwdenk- Serial Ports: 52348d0192fSAndreas Engel CONFIG_PL010_SERIAL 5246705d81eSwdenk 5256705d81eSwdenk Define this if you want support for Amba PrimeCell PL010 UARTs. 5266705d81eSwdenk 52748d0192fSAndreas Engel CONFIG_PL011_SERIAL 5286705d81eSwdenk 5296705d81eSwdenk Define this if you want support for Amba PrimeCell PL011 UARTs. 5306705d81eSwdenk 5316705d81eSwdenk CONFIG_PL011_CLOCK 5326705d81eSwdenk 5336705d81eSwdenk If you have Amba PrimeCell PL011 UARTs, set this variable to 5346705d81eSwdenk the clock speed of the UARTs. 5356705d81eSwdenk 5366705d81eSwdenk CONFIG_PL01x_PORTS 5376705d81eSwdenk 5386705d81eSwdenk If you have Amba PrimeCell PL010 or PL011 UARTs on your board, 5396705d81eSwdenk define this to a list of base addresses for each (supported) 5406705d81eSwdenk port. See e.g. include/configs/versatile.h 5416705d81eSwdenk 542910f1ae3SJohn Rigby CONFIG_PL011_SERIAL_RLCR 543910f1ae3SJohn Rigby 544910f1ae3SJohn Rigby Some vendor versions of PL011 serial ports (e.g. ST-Ericsson U8500) 545910f1ae3SJohn Rigby have separate receive and transmit line control registers. Set 546910f1ae3SJohn Rigby this variable to initialize the extra register. 547910f1ae3SJohn Rigby 548910f1ae3SJohn Rigby CONFIG_PL011_SERIAL_FLUSH_ON_INIT 549910f1ae3SJohn Rigby 550910f1ae3SJohn Rigby On some platforms (e.g. U8500) U-Boot is loaded by a second stage 551910f1ae3SJohn Rigby boot loader that has already initialized the UART. Define this 552910f1ae3SJohn Rigby variable to flush the UART at init time. 553910f1ae3SJohn Rigby 5546705d81eSwdenk 555c609719bSwdenk- Console Interface: 556c609719bSwdenk Depending on board, define exactly one serial port 557c609719bSwdenk (like CONFIG_8xx_CONS_SMC1, CONFIG_8xx_CONS_SMC2, 558c609719bSwdenk CONFIG_8xx_CONS_SCC1, ...), or switch off the serial 559c609719bSwdenk console by defining CONFIG_8xx_CONS_NONE 560c609719bSwdenk 561c609719bSwdenk Note: if CONFIG_8xx_CONS_NONE is defined, the serial 562c609719bSwdenk port routines must be defined elsewhere 563c609719bSwdenk (i.e. serial_init(), serial_getc(), ...) 564c609719bSwdenk 565c609719bSwdenk CONFIG_CFB_CONSOLE 566c609719bSwdenk Enables console device for a color framebuffer. Needs following 567c609719bSwdenk defines (cf. smiLynxEM, i8042, board/eltec/bab7xx) 568c609719bSwdenk VIDEO_FB_LITTLE_ENDIAN graphic memory organisation 569c609719bSwdenk (default big endian) 570c609719bSwdenk VIDEO_HW_RECTFILL graphic chip supports 571c609719bSwdenk rectangle fill 572c609719bSwdenk (cf. smiLynxEM) 573c609719bSwdenk VIDEO_HW_BITBLT graphic chip supports 574c609719bSwdenk bit-blit (cf. smiLynxEM) 575c609719bSwdenk VIDEO_VISIBLE_COLS visible pixel columns 576c609719bSwdenk (cols=pitch) 577c609719bSwdenk VIDEO_VISIBLE_ROWS visible pixel rows 578c609719bSwdenk VIDEO_PIXEL_SIZE bytes per pixel 579c609719bSwdenk VIDEO_DATA_FORMAT graphic data format 580c609719bSwdenk (0-5, cf. cfb_console.c) 581c609719bSwdenk VIDEO_FB_ADRS framebuffer address 582c609719bSwdenk VIDEO_KBD_INIT_FCT keyboard int fct 583c609719bSwdenk (i.e. i8042_kbd_init()) 584c609719bSwdenk VIDEO_TSTC_FCT test char fct 585c609719bSwdenk (i.e. i8042_tstc) 586c609719bSwdenk VIDEO_GETC_FCT get char fct 587c609719bSwdenk (i.e. i8042_getc) 588c609719bSwdenk CONFIG_CONSOLE_CURSOR cursor drawing on/off 589c609719bSwdenk (requires blink timer 590c609719bSwdenk cf. i8042.c) 5916d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_CONSOLE_BLINK_COUNT blink interval (cf. i8042.c) 592c609719bSwdenk CONFIG_CONSOLE_TIME display time/date info in 593c609719bSwdenk upper right corner 594602ad3b3SJon Loeliger (requires CONFIG_CMD_DATE) 595c609719bSwdenk CONFIG_VIDEO_LOGO display Linux logo in 596c609719bSwdenk upper left corner 597a6c7ad2fSwdenk CONFIG_VIDEO_BMP_LOGO use bmp_logo.h instead of 598a6c7ad2fSwdenk linux_logo.h for logo. 599a6c7ad2fSwdenk Requires CONFIG_VIDEO_LOGO 600c609719bSwdenk CONFIG_CONSOLE_EXTRA_INFO 60111ccc33fSMarcel Ziswiler additional board info beside 602c609719bSwdenk the logo 603c609719bSwdenk 604c609719bSwdenk When CONFIG_CFB_CONSOLE is defined, video console is 605c609719bSwdenk default i/o. Serial console can be forced with 606c609719bSwdenk environment 'console=serial'. 607c609719bSwdenk 608a3ad8e26Swdenk When CONFIG_SILENT_CONSOLE is defined, all console 609a3ad8e26Swdenk messages (by U-Boot and Linux!) can be silenced with 610a3ad8e26Swdenk the "silent" environment variable. See 611a3ad8e26Swdenk doc/README.silent for more information. 612a3ad8e26Swdenk 613c609719bSwdenk- Console Baudrate: 614c609719bSwdenk CONFIG_BAUDRATE - in bps 615c609719bSwdenk Select one of the baudrates listed in 6166d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_BAUDRATE_TABLE, see below. 6176d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_BRGCLK_PRESCALE, baudrate prescale 618c609719bSwdenk 619c92fac91SHeiko Schocher- Console Rx buffer length 620c92fac91SHeiko Schocher With CONFIG_SYS_SMC_RXBUFLEN it is possible to define 621c92fac91SHeiko Schocher the maximum receive buffer length for the SMC. 6222b3f12c2SHeiko Schocher This option is actual only for 82xx and 8xx possible. 623c92fac91SHeiko Schocher If using CONFIG_SYS_SMC_RXBUFLEN also CONFIG_SYS_MAXIDLE 624c92fac91SHeiko Schocher must be defined, to setup the maximum idle timeout for 625c92fac91SHeiko Schocher the SMC. 626c92fac91SHeiko Schocher 6279558b48aSGraeme Russ- Pre-Console Buffer: 6289558b48aSGraeme Russ Prior to the console being initialised (i.e. serial UART 6299558b48aSGraeme Russ initialised etc) all console output is silently discarded. 6309558b48aSGraeme Russ Defining CONFIG_PRE_CONSOLE_BUFFER will cause U-Boot to 6319558b48aSGraeme Russ buffer any console messages prior to the console being 6329558b48aSGraeme Russ initialised to a buffer of size CONFIG_PRE_CON_BUF_SZ 6339558b48aSGraeme Russ bytes located at CONFIG_PRE_CON_BUF_ADDR. The buffer is 6349558b48aSGraeme Russ a circular buffer, so if more than CONFIG_PRE_CON_BUF_SZ 6359558b48aSGraeme Russ bytes are output before the console is initialised, the 6369558b48aSGraeme Russ earlier bytes are discarded. 6379558b48aSGraeme Russ 6389558b48aSGraeme Russ 'Sane' compilers will generate smaller code if 6399558b48aSGraeme Russ CONFIG_PRE_CON_BUF_SZ is a power of 2 6409558b48aSGraeme Russ 641c609719bSwdenk- Boot Delay: CONFIG_BOOTDELAY - in seconds 642c609719bSwdenk Delay before automatically booting the default image; 643c609719bSwdenk set to -1 to disable autoboot. 644c609719bSwdenk 645c609719bSwdenk See doc/README.autoboot for these options that 646c609719bSwdenk work with CONFIG_BOOTDELAY. None are required. 647c609719bSwdenk CONFIG_BOOT_RETRY_TIME 648c609719bSwdenk CONFIG_BOOT_RETRY_MIN 649c609719bSwdenk CONFIG_AUTOBOOT_KEYED 650c609719bSwdenk CONFIG_AUTOBOOT_PROMPT 651c609719bSwdenk CONFIG_AUTOBOOT_DELAY_STR 652c609719bSwdenk CONFIG_AUTOBOOT_STOP_STR 653c609719bSwdenk CONFIG_AUTOBOOT_DELAY_STR2 654c609719bSwdenk CONFIG_AUTOBOOT_STOP_STR2 655c609719bSwdenk CONFIG_ZERO_BOOTDELAY_CHECK 656c609719bSwdenk CONFIG_RESET_TO_RETRY 657c609719bSwdenk 658c609719bSwdenk- Autoboot Command: 659c609719bSwdenk CONFIG_BOOTCOMMAND 660c609719bSwdenk Only needed when CONFIG_BOOTDELAY is enabled; 661c609719bSwdenk define a command string that is automatically executed 662c609719bSwdenk when no character is read on the console interface 663c609719bSwdenk within "Boot Delay" after reset. 664c609719bSwdenk 665c609719bSwdenk CONFIG_BOOTARGS 666c609719bSwdenk This can be used to pass arguments to the bootm 667c609719bSwdenk command. The value of CONFIG_BOOTARGS goes into the 668c609719bSwdenk environment value "bootargs". 669c609719bSwdenk 670c609719bSwdenk CONFIG_RAMBOOT and CONFIG_NFSBOOT 671c609719bSwdenk The value of these goes into the environment as 672c609719bSwdenk "ramboot" and "nfsboot" respectively, and can be used 673c609719bSwdenk as a convenience, when switching between booting from 67411ccc33fSMarcel Ziswiler RAM and NFS. 675c609719bSwdenk 676c609719bSwdenk- Pre-Boot Commands: 677c609719bSwdenk CONFIG_PREBOOT 678c609719bSwdenk 679c609719bSwdenk When this option is #defined, the existence of the 680c609719bSwdenk environment variable "preboot" will be checked 681c609719bSwdenk immediately before starting the CONFIG_BOOTDELAY 682c609719bSwdenk countdown and/or running the auto-boot command resp. 683c609719bSwdenk entering interactive mode. 684c609719bSwdenk 685c609719bSwdenk This feature is especially useful when "preboot" is 686c609719bSwdenk automatically generated or modified. For an example 687c609719bSwdenk see the LWMON board specific code: here "preboot" is 688c609719bSwdenk modified when the user holds down a certain 689c609719bSwdenk combination of keys on the (special) keyboard when 690c609719bSwdenk booting the systems 691c609719bSwdenk 692c609719bSwdenk- Serial Download Echo Mode: 693c609719bSwdenk CONFIG_LOADS_ECHO 694c609719bSwdenk If defined to 1, all characters received during a 695c609719bSwdenk serial download (using the "loads" command) are 696c609719bSwdenk echoed back. This might be needed by some terminal 697c609719bSwdenk emulations (like "cu"), but may as well just take 698c609719bSwdenk time on others. This setting #define's the initial 699c609719bSwdenk value of the "loads_echo" environment variable. 700c609719bSwdenk 701602ad3b3SJon Loeliger- Kgdb Serial Baudrate: (if CONFIG_CMD_KGDB is defined) 702c609719bSwdenk CONFIG_KGDB_BAUDRATE 703c609719bSwdenk Select one of the baudrates listed in 7046d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_BAUDRATE_TABLE, see below. 705c609719bSwdenk 706c609719bSwdenk- Monitor Functions: 707602ad3b3SJon Loeliger Monitor commands can be included or excluded 708602ad3b3SJon Loeliger from the build by using the #include files 709602ad3b3SJon Loeliger "config_cmd_all.h" and #undef'ing unwanted 710602ad3b3SJon Loeliger commands, or using "config_cmd_default.h" 711602ad3b3SJon Loeliger and augmenting with additional #define's 712602ad3b3SJon Loeliger for wanted commands. 713c609719bSwdenk 714602ad3b3SJon Loeliger The default command configuration includes all commands 715602ad3b3SJon Loeliger except those marked below with a "*". 716602ad3b3SJon Loeliger 717602ad3b3SJon Loeliger CONFIG_CMD_ASKENV * ask for env variable 718602ad3b3SJon Loeliger CONFIG_CMD_BDI bdinfo 719602ad3b3SJon Loeliger CONFIG_CMD_BEDBUG * Include BedBug Debugger 720602ad3b3SJon Loeliger CONFIG_CMD_BMP * BMP support 721602ad3b3SJon Loeliger CONFIG_CMD_BSP * Board specific commands 722602ad3b3SJon Loeliger CONFIG_CMD_BOOTD bootd 723602ad3b3SJon Loeliger CONFIG_CMD_CACHE * icache, dcache 724602ad3b3SJon Loeliger CONFIG_CMD_CONSOLE coninfo 725710b9938SMike Frysinger CONFIG_CMD_CRC32 * crc32 726602ad3b3SJon Loeliger CONFIG_CMD_DATE * support for RTC, date/time... 727602ad3b3SJon Loeliger CONFIG_CMD_DHCP * DHCP support 728602ad3b3SJon Loeliger CONFIG_CMD_DIAG * Diagnostics 729a7c93104SPeter Tyser CONFIG_CMD_DS4510 * ds4510 I2C gpio commands 730a7c93104SPeter Tyser CONFIG_CMD_DS4510_INFO * ds4510 I2C info command 731a7c93104SPeter Tyser CONFIG_CMD_DS4510_MEM * ds4510 I2C eeprom/sram commansd 732a7c93104SPeter Tyser CONFIG_CMD_DS4510_RST * ds4510 I2C rst command 733602ad3b3SJon Loeliger CONFIG_CMD_DTT * Digital Therm and Thermostat 734602ad3b3SJon Loeliger CONFIG_CMD_ECHO echo arguments 735246c6922SPeter Tyser CONFIG_CMD_EDITENV edit env variable 736602ad3b3SJon Loeliger CONFIG_CMD_EEPROM * EEPROM read/write support 737602ad3b3SJon Loeliger CONFIG_CMD_ELF * bootelf, bootvx 7380c79cda0SMike Frysinger CONFIG_CMD_EXPORTENV * export the environment 739bdab39d3SMike Frysinger CONFIG_CMD_SAVEENV saveenv 740602ad3b3SJon Loeliger CONFIG_CMD_FDC * Floppy Disk Support 741602ad3b3SJon Loeliger CONFIG_CMD_FAT * FAT partition support 742602ad3b3SJon Loeliger CONFIG_CMD_FDOS * Dos diskette Support 743602ad3b3SJon Loeliger CONFIG_CMD_FLASH flinfo, erase, protect 744602ad3b3SJon Loeliger CONFIG_CMD_FPGA FPGA device initialization support 745a641b979SMike Frysinger CONFIG_CMD_GO * the 'go' command (exec code) 746a000b795SKim Phillips CONFIG_CMD_GREPENV * search environment 747602ad3b3SJon Loeliger CONFIG_CMD_HWFLOW * RTS/CTS hw flow control 748602ad3b3SJon Loeliger CONFIG_CMD_I2C * I2C serial bus support 749602ad3b3SJon Loeliger CONFIG_CMD_IDE * IDE harddisk support 750602ad3b3SJon Loeliger CONFIG_CMD_IMI iminfo 751602ad3b3SJon Loeliger CONFIG_CMD_IMLS List all found images 752602ad3b3SJon Loeliger CONFIG_CMD_IMMAP * IMMR dump support 7530c79cda0SMike Frysinger CONFIG_CMD_IMPORTENV * import an environment 754602ad3b3SJon Loeliger CONFIG_CMD_IRQ * irqinfo 755602ad3b3SJon Loeliger CONFIG_CMD_ITEST Integer/string test of 2 values 756602ad3b3SJon Loeliger CONFIG_CMD_JFFS2 * JFFS2 Support 757602ad3b3SJon Loeliger CONFIG_CMD_KGDB * kgdb 7581ba7fd25SMike Frysinger CONFIG_CMD_LDRINFO ldrinfo (display Blackfin loader) 759602ad3b3SJon Loeliger CONFIG_CMD_LOADB loadb 760602ad3b3SJon Loeliger CONFIG_CMD_LOADS loads 76102c9aa1dSRobin Getz CONFIG_CMD_MD5SUM print md5 message digest 76202c9aa1dSRobin Getz (requires CONFIG_CMD_MEMORY and CONFIG_MD5) 763602ad3b3SJon Loeliger CONFIG_CMD_MEMORY md, mm, nm, mw, cp, cmp, crc, base, 76456523f12Swdenk loop, loopw, mtest 765602ad3b3SJon Loeliger CONFIG_CMD_MISC Misc functions like sleep etc 766602ad3b3SJon Loeliger CONFIG_CMD_MMC * MMC memory mapped support 767602ad3b3SJon Loeliger CONFIG_CMD_MII * MII utility commands 76868d7d651SStefan Roese CONFIG_CMD_MTDPARTS * MTD partition support 769602ad3b3SJon Loeliger CONFIG_CMD_NAND * NAND support 770602ad3b3SJon Loeliger CONFIG_CMD_NET bootp, tftpboot, rarpboot 771e92739d3SPeter Tyser CONFIG_CMD_PCA953X * PCA953x I2C gpio commands 772e92739d3SPeter Tyser CONFIG_CMD_PCA953X_INFO * PCA953x I2C gpio info command 773602ad3b3SJon Loeliger CONFIG_CMD_PCI * pciinfo 774602ad3b3SJon Loeliger CONFIG_CMD_PCMCIA * PCMCIA support 775602ad3b3SJon Loeliger CONFIG_CMD_PING * send ICMP ECHO_REQUEST to network 776602ad3b3SJon Loeliger host 777602ad3b3SJon Loeliger CONFIG_CMD_PORTIO * Port I/O 778602ad3b3SJon Loeliger CONFIG_CMD_REGINFO * Register dump 779602ad3b3SJon Loeliger CONFIG_CMD_RUN run command in env variable 780602ad3b3SJon Loeliger CONFIG_CMD_SAVES * save S record dump 781602ad3b3SJon Loeliger CONFIG_CMD_SCSI * SCSI Support 782602ad3b3SJon Loeliger CONFIG_CMD_SDRAM * print SDRAM configuration information 783602ad3b3SJon Loeliger (requires CONFIG_CMD_I2C) 784602ad3b3SJon Loeliger CONFIG_CMD_SETGETDCR Support for DCR Register access 785602ad3b3SJon Loeliger (4xx only) 786c6b1ee66SAlexander Holler CONFIG_CMD_SHA1SUM print sha1 memory digest 78702c9aa1dSRobin Getz (requires CONFIG_CMD_MEMORY) 78874de7aefSWolfgang Denk CONFIG_CMD_SOURCE "source" command Support 789602ad3b3SJon Loeliger CONFIG_CMD_SPI * SPI serial bus support 7907a83af07SLuca Ceresoli CONFIG_CMD_TFTPSRV * TFTP transfer in server mode 791ca366d0eSChe-liang Chiou CONFIG_CMD_TIME * run command and report execution time 792602ad3b3SJon Loeliger CONFIG_CMD_USB * USB support 793602ad3b3SJon Loeliger CONFIG_CMD_CDP * Cisco Discover Protocol support 794602ad3b3SJon Loeliger CONFIG_CMD_FSL * Microblaze FSL support 795c609719bSwdenk 796c609719bSwdenk 797c609719bSwdenk EXAMPLE: If you want all functions except of network 798c609719bSwdenk support you can write: 799c609719bSwdenk 800602ad3b3SJon Loeliger #include "config_cmd_all.h" 801602ad3b3SJon Loeliger #undef CONFIG_CMD_NET 802c609719bSwdenk 803213bf8c8SGerald Van Baren Other Commands: 804213bf8c8SGerald Van Baren fdt (flattened device tree) command: CONFIG_OF_LIBFDT 805c609719bSwdenk 806c609719bSwdenk Note: Don't enable the "icache" and "dcache" commands 807602ad3b3SJon Loeliger (configuration option CONFIG_CMD_CACHE) unless you know 808c609719bSwdenk what you (and your U-Boot users) are doing. Data 809c609719bSwdenk cache cannot be enabled on systems like the 8xx or 810c609719bSwdenk 8260 (where accesses to the IMMR region must be 811c609719bSwdenk uncached), and it cannot be disabled on all other 812c609719bSwdenk systems where we (mis-) use the data cache to hold an 813c609719bSwdenk initial stack and some data. 814c609719bSwdenk 815c609719bSwdenk 816c609719bSwdenk XXX - this list needs to get updated! 817c609719bSwdenk 818c609719bSwdenk- Watchdog: 819c609719bSwdenk CONFIG_WATCHDOG 820c609719bSwdenk If this variable is defined, it enables watchdog 8216abe6fb6SDetlev Zundel support for the SoC. There must be support in the SoC 8226abe6fb6SDetlev Zundel specific code for a watchdog. For the 8xx and 8260 8236abe6fb6SDetlev Zundel CPUs, the SIU Watchdog feature is enabled in the SYPCR 8246abe6fb6SDetlev Zundel register. When supported for a specific SoC is 8256abe6fb6SDetlev Zundel available, then no further board specific code should 8266abe6fb6SDetlev Zundel be needed to use it. 8276abe6fb6SDetlev Zundel 8286abe6fb6SDetlev Zundel CONFIG_HW_WATCHDOG 8296abe6fb6SDetlev Zundel When using a watchdog circuitry external to the used 8306abe6fb6SDetlev Zundel SoC, then define this variable and provide board 8316abe6fb6SDetlev Zundel specific code for the "hw_watchdog_reset" function. 832c609719bSwdenk 833c1551ea8Sstroese- U-Boot Version: 834c1551ea8Sstroese CONFIG_VERSION_VARIABLE 835c1551ea8Sstroese If this variable is defined, an environment variable 836c1551ea8Sstroese named "ver" is created by U-Boot showing the U-Boot 837c1551ea8Sstroese version as printed by the "version" command. 838c1551ea8Sstroese This variable is readonly. 839c1551ea8Sstroese 840c609719bSwdenk- Real-Time Clock: 841c609719bSwdenk 842602ad3b3SJon Loeliger When CONFIG_CMD_DATE is selected, the type of the RTC 843c609719bSwdenk has to be selected, too. Define exactly one of the 844c609719bSwdenk following options: 845c609719bSwdenk 846c609719bSwdenk CONFIG_RTC_MPC8xx - use internal RTC of MPC8xx 847c609719bSwdenk CONFIG_RTC_PCF8563 - use Philips PCF8563 RTC 8487ce63709SGuennadi Liakhovetski CONFIG_RTC_MC13783 - use MC13783 RTC 849c609719bSwdenk CONFIG_RTC_MC146818 - use MC146818 RTC 8501cb8e980Swdenk CONFIG_RTC_DS1307 - use Maxim, Inc. DS1307 RTC 851c609719bSwdenk CONFIG_RTC_DS1337 - use Maxim, Inc. DS1337 RTC 8527f70e853Swdenk CONFIG_RTC_DS1338 - use Maxim, Inc. DS1338 RTC 8533bac3513Swdenk CONFIG_RTC_DS164x - use Dallas DS164x RTC 8549536dfccSTor Krill CONFIG_RTC_ISL1208 - use Intersil ISL1208 RTC 8554c0d4c3bSwdenk CONFIG_RTC_MAX6900 - use Maxim, Inc. MAX6900 RTC 8566d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_RTC_DS1337_NOOSC - Turn off the OSC output for DS1337 85771d19f30SHeiko Schocher CONFIG_SYS_RV3029_TCR - enable trickle charger on 85871d19f30SHeiko Schocher RV3029 RTC. 859c609719bSwdenk 860b37c7e5eSwdenk Note that if the RTC uses I2C, then the I2C interface 861b37c7e5eSwdenk must also be configured. See I2C Support, below. 862b37c7e5eSwdenk 863e92739d3SPeter Tyser- GPIO Support: 864e92739d3SPeter Tyser CONFIG_PCA953X - use NXP's PCA953X series I2C GPIO 865e92739d3SPeter Tyser CONFIG_PCA953X_INFO - enable pca953x info command 866e92739d3SPeter Tyser 8675dec49caSChris Packham The CONFIG_SYS_I2C_PCA953X_WIDTH option specifies a list of 8685dec49caSChris Packham chip-ngpio pairs that tell the PCA953X driver the number of 8695dec49caSChris Packham pins supported by a particular chip. 8705dec49caSChris Packham 871e92739d3SPeter Tyser Note that if the GPIO device uses I2C, then the I2C interface 872e92739d3SPeter Tyser must also be configured. See I2C Support, below. 873e92739d3SPeter Tyser 874c609719bSwdenk- Timestamp Support: 875c609719bSwdenk 876c609719bSwdenk When CONFIG_TIMESTAMP is selected, the timestamp 877c609719bSwdenk (date and time) of an image is printed by image 878c609719bSwdenk commands like bootm or iminfo. This option is 879602ad3b3SJon Loeliger automatically enabled when you select CONFIG_CMD_DATE . 880c609719bSwdenk 881c609719bSwdenk- Partition Support: 882c609719bSwdenk CONFIG_MAC_PARTITION and/or CONFIG_DOS_PARTITION 88307f3d789Srichardretanubun and/or CONFIG_ISO_PARTITION and/or CONFIG_EFI_PARTITION 884c609719bSwdenk 885602ad3b3SJon Loeliger If IDE or SCSI support is enabled (CONFIG_CMD_IDE or 886218ca724SWolfgang Denk CONFIG_CMD_SCSI) you must configure support for at 887218ca724SWolfgang Denk least one partition type as well. 888c609719bSwdenk 889c609719bSwdenk- IDE Reset method: 8904d13cbadSwdenk CONFIG_IDE_RESET_ROUTINE - this is defined in several 8914d13cbadSwdenk board configurations files but used nowhere! 892c609719bSwdenk 8934d13cbadSwdenk CONFIG_IDE_RESET - is this is defined, IDE Reset will 8944d13cbadSwdenk be performed by calling the function 8954d13cbadSwdenk ide_set_reset(int reset) 8964d13cbadSwdenk which has to be defined in a board specific file 897c609719bSwdenk 898c609719bSwdenk- ATAPI Support: 899c609719bSwdenk CONFIG_ATAPI 900c609719bSwdenk 901c609719bSwdenk Set this to enable ATAPI support. 902c609719bSwdenk 903c40b2956Swdenk- LBA48 Support 904c40b2956Swdenk CONFIG_LBA48 905c40b2956Swdenk 906c40b2956Swdenk Set this to enable support for disks larger than 137GB 9074b142febSHeiko Schocher Also look at CONFIG_SYS_64BIT_LBA. 908c40b2956Swdenk Whithout these , LBA48 support uses 32bit variables and will 'only' 909c40b2956Swdenk support disks up to 2.1TB. 910c40b2956Swdenk 9116d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_64BIT_LBA: 912c40b2956Swdenk When enabled, makes the IDE subsystem use 64bit sector addresses. 913c40b2956Swdenk Default is 32bit. 914c40b2956Swdenk 915c609719bSwdenk- SCSI Support: 916c609719bSwdenk At the moment only there is only support for the 917c609719bSwdenk SYM53C8XX SCSI controller; define 918c609719bSwdenk CONFIG_SCSI_SYM53C8XX to enable it. 919c609719bSwdenk 9206d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_SCSI_MAX_LUN [8], CONFIG_SYS_SCSI_MAX_SCSI_ID [7] and 9216d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_SCSI_MAX_DEVICE [CONFIG_SYS_SCSI_MAX_SCSI_ID * 9226d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_SCSI_MAX_LUN] can be adjusted to define the 923c609719bSwdenk maximum numbers of LUNs, SCSI ID's and target 924c609719bSwdenk devices. 9256d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_SCSI_SYM53C8XX_CCF to fix clock timing (80Mhz) 926c609719bSwdenk 927c609719bSwdenk- NETWORK Support (PCI): 928682011ffSwdenk CONFIG_E1000 929682011ffSwdenk Support for Intel 8254x gigabit chips. 930682011ffSwdenk 931ac3315c2SAndre Schwarz CONFIG_E1000_FALLBACK_MAC 93211ccc33fSMarcel Ziswiler default MAC for empty EEPROM after production. 933ac3315c2SAndre Schwarz 934c609719bSwdenk CONFIG_EEPRO100 935c609719bSwdenk Support for Intel 82557/82559/82559ER chips. 93611ccc33fSMarcel Ziswiler Optional CONFIG_EEPRO100_SROM_WRITE enables EEPROM 937c609719bSwdenk write routine for first time initialisation. 938c609719bSwdenk 939c609719bSwdenk CONFIG_TULIP 940c609719bSwdenk Support for Digital 2114x chips. 941c609719bSwdenk Optional CONFIG_TULIP_SELECT_MEDIA for board specific 942c609719bSwdenk modem chip initialisation (KS8761/QS6611). 943c609719bSwdenk 944c609719bSwdenk CONFIG_NATSEMI 945c609719bSwdenk Support for National dp83815 chips. 946c609719bSwdenk 947c609719bSwdenk CONFIG_NS8382X 948c609719bSwdenk Support for National dp8382[01] gigabit chips. 949c609719bSwdenk 95045219c46Swdenk- NETWORK Support (other): 95145219c46Swdenk 952c041e9d2SJens Scharsig CONFIG_DRIVER_AT91EMAC 953c041e9d2SJens Scharsig Support for AT91RM9200 EMAC. 954c041e9d2SJens Scharsig 955c041e9d2SJens Scharsig CONFIG_RMII 956c041e9d2SJens Scharsig Define this to use reduced MII inteface 957c041e9d2SJens Scharsig 958c041e9d2SJens Scharsig CONFIG_DRIVER_AT91EMAC_QUIET 959c041e9d2SJens Scharsig If this defined, the driver is quiet. 960c041e9d2SJens Scharsig The driver doen't show link status messages. 961c041e9d2SJens Scharsig 96245219c46Swdenk CONFIG_DRIVER_LAN91C96 96345219c46Swdenk Support for SMSC's LAN91C96 chips. 96445219c46Swdenk 96545219c46Swdenk CONFIG_LAN91C96_BASE 96645219c46Swdenk Define this to hold the physical address 96745219c46Swdenk of the LAN91C96's I/O space 96845219c46Swdenk 96945219c46Swdenk CONFIG_LAN91C96_USE_32_BIT 97045219c46Swdenk Define this to enable 32 bit addressing 97145219c46Swdenk 972f39748aeSwdenk CONFIG_DRIVER_SMC91111 973f39748aeSwdenk Support for SMSC's LAN91C111 chip 974f39748aeSwdenk 975f39748aeSwdenk CONFIG_SMC91111_BASE 976f39748aeSwdenk Define this to hold the physical address 977f39748aeSwdenk of the device (I/O space) 978f39748aeSwdenk 979f39748aeSwdenk CONFIG_SMC_USE_32_BIT 980f39748aeSwdenk Define this if data bus is 32 bits 981f39748aeSwdenk 982f39748aeSwdenk CONFIG_SMC_USE_IOFUNCS 983f39748aeSwdenk Define this to use i/o functions instead of macros 984f39748aeSwdenk (some hardware wont work with macros) 985f39748aeSwdenk 986b3dbf4a5SMacpaul Lin CONFIG_FTGMAC100 987b3dbf4a5SMacpaul Lin Support for Faraday's FTGMAC100 Gigabit SoC Ethernet 988b3dbf4a5SMacpaul Lin 989b3dbf4a5SMacpaul Lin CONFIG_FTGMAC100_EGIGA 990b3dbf4a5SMacpaul Lin Define this to use GE link update with gigabit PHY. 991b3dbf4a5SMacpaul Lin Define this if FTGMAC100 is connected to gigabit PHY. 992b3dbf4a5SMacpaul Lin If your system has 10/100 PHY only, it might not occur 993b3dbf4a5SMacpaul Lin wrong behavior. Because PHY usually return timeout or 994b3dbf4a5SMacpaul Lin useless data when polling gigabit status and gigabit 995b3dbf4a5SMacpaul Lin control registers. This behavior won't affect the 996b3dbf4a5SMacpaul Lin correctnessof 10/100 link speed update. 997b3dbf4a5SMacpaul Lin 998c2fff331SMike Rapoport CONFIG_SMC911X 999557b377dSJens Gehrlein Support for SMSC's LAN911x and LAN921x chips 1000557b377dSJens Gehrlein 1001c2fff331SMike Rapoport CONFIG_SMC911X_BASE 1002557b377dSJens Gehrlein Define this to hold the physical address 1003557b377dSJens Gehrlein of the device (I/O space) 1004557b377dSJens Gehrlein 1005c2fff331SMike Rapoport CONFIG_SMC911X_32_BIT 1006557b377dSJens Gehrlein Define this if data bus is 32 bits 1007557b377dSJens Gehrlein 1008c2fff331SMike Rapoport CONFIG_SMC911X_16_BIT 1009557b377dSJens Gehrlein Define this if data bus is 16 bits. If your processor 1010557b377dSJens Gehrlein automatically converts one 32 bit word to two 16 bit 1011c2fff331SMike Rapoport words you may also try CONFIG_SMC911X_32_BIT. 1012557b377dSJens Gehrlein 10133d0075faSYoshihiro Shimoda CONFIG_SH_ETHER 10143d0075faSYoshihiro Shimoda Support for Renesas on-chip Ethernet controller 10153d0075faSYoshihiro Shimoda 10163d0075faSYoshihiro Shimoda CONFIG_SH_ETHER_USE_PORT 10173d0075faSYoshihiro Shimoda Define the number of ports to be used 10183d0075faSYoshihiro Shimoda 10193d0075faSYoshihiro Shimoda CONFIG_SH_ETHER_PHY_ADDR 10203d0075faSYoshihiro Shimoda Define the ETH PHY's address 10213d0075faSYoshihiro Shimoda 102268260aabSYoshihiro Shimoda CONFIG_SH_ETHER_CACHE_WRITEBACK 102368260aabSYoshihiro Shimoda If this option is set, the driver enables cache flush. 102468260aabSYoshihiro Shimoda 1025c609719bSwdenk- USB Support: 1026c609719bSwdenk At the moment only the UHCI host controller is 10274d13cbadSwdenk supported (PIP405, MIP405, MPC5200); define 1028c609719bSwdenk CONFIG_USB_UHCI to enable it. 1029c609719bSwdenk define CONFIG_USB_KEYBOARD to enable the USB Keyboard 103030d56faeSwdenk and define CONFIG_USB_STORAGE to enable the USB 1031c609719bSwdenk storage devices. 1032c609719bSwdenk Note: 1033c609719bSwdenk Supported are USB Keyboards and USB Floppy drives 1034c609719bSwdenk (TEAC FD-05PUB). 10354d13cbadSwdenk MPC5200 USB requires additional defines: 10364d13cbadSwdenk CONFIG_USB_CLOCK 10374d13cbadSwdenk for 528 MHz Clock: 0x0001bbbb 1038307ecb6dSEric Millbrandt CONFIG_PSC3_USB 1039307ecb6dSEric Millbrandt for USB on PSC3 10404d13cbadSwdenk CONFIG_USB_CONFIG 10414d13cbadSwdenk for differential drivers: 0x00001000 10424d13cbadSwdenk for single ended drivers: 0x00005000 1043307ecb6dSEric Millbrandt for differential drivers on PSC3: 0x00000100 1044307ecb6dSEric Millbrandt for single ended drivers on PSC3: 0x00004100 10456d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_USB_EVENT_POLL 1046fdcfaa1bSZhang Wei May be defined to allow interrupt polling 1047fdcfaa1bSZhang Wei instead of using asynchronous interrupts 10484d13cbadSwdenk 104916c8d5e7SWolfgang Denk- USB Device: 105016c8d5e7SWolfgang Denk Define the below if you wish to use the USB console. 105116c8d5e7SWolfgang Denk Once firmware is rebuilt from a serial console issue the 105216c8d5e7SWolfgang Denk command "setenv stdin usbtty; setenv stdout usbtty" and 105311ccc33fSMarcel Ziswiler attach your USB cable. The Unix command "dmesg" should print 105416c8d5e7SWolfgang Denk it has found a new device. The environment variable usbtty 105516c8d5e7SWolfgang Denk can be set to gserial or cdc_acm to enable your device to 105616c8d5e7SWolfgang Denk appear to a USB host as a Linux gserial device or a 105716c8d5e7SWolfgang Denk Common Device Class Abstract Control Model serial device. 105816c8d5e7SWolfgang Denk If you select usbtty = gserial you should be able to enumerate 105916c8d5e7SWolfgang Denk a Linux host by 106016c8d5e7SWolfgang Denk # modprobe usbserial vendor=0xVendorID product=0xProductID 106116c8d5e7SWolfgang Denk else if using cdc_acm, simply setting the environment 106216c8d5e7SWolfgang Denk variable usbtty to be cdc_acm should suffice. The following 106316c8d5e7SWolfgang Denk might be defined in YourBoardName.h 106416c8d5e7SWolfgang Denk 106516c8d5e7SWolfgang Denk CONFIG_USB_DEVICE 106616c8d5e7SWolfgang Denk Define this to build a UDC device 106716c8d5e7SWolfgang Denk 106816c8d5e7SWolfgang Denk CONFIG_USB_TTY 106916c8d5e7SWolfgang Denk Define this to have a tty type of device available to 107016c8d5e7SWolfgang Denk talk to the UDC device 107116c8d5e7SWolfgang Denk 10726d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_CONSOLE_IS_IN_ENV 107316c8d5e7SWolfgang Denk Define this if you want stdin, stdout &/or stderr to 107416c8d5e7SWolfgang Denk be set to usbtty. 107516c8d5e7SWolfgang Denk 107616c8d5e7SWolfgang Denk mpc8xx: 10776d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_USB_EXTC_CLK 0xBLAH 107816c8d5e7SWolfgang Denk Derive USB clock from external clock "blah" 10796d0f6bcfSJean-Christophe PLAGNIOL-VILLARD - CONFIG_SYS_USB_EXTC_CLK 0x02 108016c8d5e7SWolfgang Denk 10816d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_USB_BRG_CLK 0xBLAH 108216c8d5e7SWolfgang Denk Derive USB clock from brgclk 10836d0f6bcfSJean-Christophe PLAGNIOL-VILLARD - CONFIG_SYS_USB_BRG_CLK 0x04 108416c8d5e7SWolfgang Denk 108516c8d5e7SWolfgang Denk If you have a USB-IF assigned VendorID then you may wish to 108616c8d5e7SWolfgang Denk define your own vendor specific values either in BoardName.h 108716c8d5e7SWolfgang Denk or directly in usbd_vendor_info.h. If you don't define 108816c8d5e7SWolfgang Denk CONFIG_USBD_MANUFACTURER, CONFIG_USBD_PRODUCT_NAME, 108916c8d5e7SWolfgang Denk CONFIG_USBD_VENDORID and CONFIG_USBD_PRODUCTID, then U-Boot 109016c8d5e7SWolfgang Denk should pretend to be a Linux device to it's target host. 109116c8d5e7SWolfgang Denk 109216c8d5e7SWolfgang Denk CONFIG_USBD_MANUFACTURER 109316c8d5e7SWolfgang Denk Define this string as the name of your company for 109416c8d5e7SWolfgang Denk - CONFIG_USBD_MANUFACTURER "my company" 109516c8d5e7SWolfgang Denk 109616c8d5e7SWolfgang Denk CONFIG_USBD_PRODUCT_NAME 109716c8d5e7SWolfgang Denk Define this string as the name of your product 109816c8d5e7SWolfgang Denk - CONFIG_USBD_PRODUCT_NAME "acme usb device" 109916c8d5e7SWolfgang Denk 110016c8d5e7SWolfgang Denk CONFIG_USBD_VENDORID 110116c8d5e7SWolfgang Denk Define this as your assigned Vendor ID from the USB 110216c8d5e7SWolfgang Denk Implementors Forum. This *must* be a genuine Vendor ID 110316c8d5e7SWolfgang Denk to avoid polluting the USB namespace. 110416c8d5e7SWolfgang Denk - CONFIG_USBD_VENDORID 0xFFFF 110516c8d5e7SWolfgang Denk 110616c8d5e7SWolfgang Denk CONFIG_USBD_PRODUCTID 110716c8d5e7SWolfgang Denk Define this as the unique Product ID 110816c8d5e7SWolfgang Denk for your device 110916c8d5e7SWolfgang Denk - CONFIG_USBD_PRODUCTID 0xFFFF 1110c609719bSwdenk 1111c609719bSwdenk 1112c609719bSwdenk- MMC Support: 1113c609719bSwdenk The MMC controller on the Intel PXA is supported. To 1114c609719bSwdenk enable this define CONFIG_MMC. The MMC can be 1115c609719bSwdenk accessed from the boot prompt by mapping the device 1116c609719bSwdenk to physical memory similar to flash. Command line is 1117602ad3b3SJon Loeliger enabled with CONFIG_CMD_MMC. The MMC driver also works with 1118602ad3b3SJon Loeliger the FAT fs. This is enabled with CONFIG_CMD_FAT. 1119c609719bSwdenk 1120afb35666SYoshihiro Shimoda CONFIG_SH_MMCIF 1121afb35666SYoshihiro Shimoda Support for Renesas on-chip MMCIF controller 1122afb35666SYoshihiro Shimoda 1123afb35666SYoshihiro Shimoda CONFIG_SH_MMCIF_ADDR 1124afb35666SYoshihiro Shimoda Define the base address of MMCIF registers 1125afb35666SYoshihiro Shimoda 1126afb35666SYoshihiro Shimoda CONFIG_SH_MMCIF_CLK 1127afb35666SYoshihiro Shimoda Define the clock frequency for MMCIF 1128afb35666SYoshihiro Shimoda 11296705d81eSwdenk- Journaling Flash filesystem support: 11306705d81eSwdenk CONFIG_JFFS2_NAND, CONFIG_JFFS2_NAND_OFF, CONFIG_JFFS2_NAND_SIZE, 11316705d81eSwdenk CONFIG_JFFS2_NAND_DEV 11326705d81eSwdenk Define these for a default partition on a NAND device 11336705d81eSwdenk 11346d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_JFFS2_FIRST_SECTOR, 11356d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_JFFS2_FIRST_BANK, CONFIG_SYS_JFFS2_NUM_BANKS 11366705d81eSwdenk Define these for a default partition on a NOR device 11376705d81eSwdenk 11386d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_JFFS_CUSTOM_PART 11396705d81eSwdenk Define this to create an own partition. You have to provide a 11406705d81eSwdenk function struct part_info* jffs2_part_info(int part_num) 11416705d81eSwdenk 11426705d81eSwdenk If you define only one JFFS2 partition you may also want to 11436d0f6bcfSJean-Christophe PLAGNIOL-VILLARD #define CONFIG_SYS_JFFS_SINGLE_PART 1 11446705d81eSwdenk to disable the command chpart. This is the default when you 11456705d81eSwdenk have not defined a custom partition 11466705d81eSwdenk 1147c609719bSwdenk- Keyboard Support: 1148c609719bSwdenk CONFIG_ISA_KEYBOARD 1149c609719bSwdenk 1150c609719bSwdenk Define this to enable standard (PC-Style) keyboard 1151c609719bSwdenk support 1152c609719bSwdenk 1153c609719bSwdenk CONFIG_I8042_KBD 1154c609719bSwdenk Standard PC keyboard driver with US (is default) and 1155c609719bSwdenk GERMAN key layout (switch via environment 'keymap=de') support. 1156c609719bSwdenk Export function i8042_kbd_init, i8042_tstc and i8042_getc 1157c609719bSwdenk for cfb_console. Supports cursor blinking. 1158c609719bSwdenk 1159c609719bSwdenk- Video support: 1160c609719bSwdenk CONFIG_VIDEO 1161c609719bSwdenk 1162c609719bSwdenk Define this to enable video support (for output to 1163c609719bSwdenk video). 1164c609719bSwdenk 1165c609719bSwdenk CONFIG_VIDEO_CT69000 1166c609719bSwdenk 1167c609719bSwdenk Enable Chips & Technologies 69000 Video chip 1168c609719bSwdenk 1169c609719bSwdenk CONFIG_VIDEO_SMI_LYNXEM 1170eeb1b77bSwdenk Enable Silicon Motion SMI 712/710/810 Video chip. The 1171eeb1b77bSwdenk video output is selected via environment 'videoout' 1172eeb1b77bSwdenk (1 = LCD and 2 = CRT). If videoout is undefined, CRT is 1173eeb1b77bSwdenk assumed. 1174c609719bSwdenk 1175eeb1b77bSwdenk For the CT69000 and SMI_LYNXEM drivers, videomode is 117611ccc33fSMarcel Ziswiler selected via environment 'videomode'. Two different ways 1177eeb1b77bSwdenk are possible: 1178eeb1b77bSwdenk - "videomode=num" 'num' is a standard LiLo mode numbers. 1179eeb1b77bSwdenk Following standard modes are supported (* is default): 1180eeb1b77bSwdenk 1181eeb1b77bSwdenk Colors 640x480 800x600 1024x768 1152x864 1280x1024 1182eeb1b77bSwdenk -------------+--------------------------------------------- 1183eeb1b77bSwdenk 8 bits | 0x301* 0x303 0x305 0x161 0x307 1184eeb1b77bSwdenk 15 bits | 0x310 0x313 0x316 0x162 0x319 1185eeb1b77bSwdenk 16 bits | 0x311 0x314 0x317 0x163 0x31A 1186eeb1b77bSwdenk 24 bits | 0x312 0x315 0x318 ? 0x31B 1187eeb1b77bSwdenk -------------+--------------------------------------------- 1188c609719bSwdenk (i.e. setenv videomode 317; saveenv; reset;) 1189c609719bSwdenk 1190eeb1b77bSwdenk - "videomode=bootargs" all the video parameters are parsed 11917817cb20SMarcel Ziswiler from the bootargs. (See drivers/video/videomodes.c) 1192eeb1b77bSwdenk 1193eeb1b77bSwdenk 1194a6c7ad2fSwdenk CONFIG_VIDEO_SED13806 1195a6c7ad2fSwdenk Enable Epson SED13806 driver. This driver supports 8bpp 1196a6c7ad2fSwdenk and 16bpp modes defined by CONFIG_VIDEO_SED13806_8BPP 1197a6c7ad2fSwdenk or CONFIG_VIDEO_SED13806_16BPP 1198a6c7ad2fSwdenk 11997d3053fbSTimur Tabi CONFIG_FSL_DIU_FB 12007d3053fbSTimur Tabi Enable the Freescale DIU video driver. Reference boards for 12017d3053fbSTimur Tabi SOCs that have a DIU should define this macro to enable DIU 12027d3053fbSTimur Tabi support, and should also define these other macros: 12037d3053fbSTimur Tabi 12047d3053fbSTimur Tabi CONFIG_SYS_DIU_ADDR 12057d3053fbSTimur Tabi CONFIG_VIDEO 12067d3053fbSTimur Tabi CONFIG_CMD_BMP 12077d3053fbSTimur Tabi CONFIG_CFB_CONSOLE 12087d3053fbSTimur Tabi CONFIG_VIDEO_SW_CURSOR 12097d3053fbSTimur Tabi CONFIG_VGA_AS_SINGLE_DEVICE 12107d3053fbSTimur Tabi CONFIG_VIDEO_LOGO 12117d3053fbSTimur Tabi CONFIG_VIDEO_BMP_LOGO 12127d3053fbSTimur Tabi 1213ba8e76bdSTimur Tabi The DIU driver will look for the 'video-mode' environment 1214ba8e76bdSTimur Tabi variable, and if defined, enable the DIU as a console during 1215ba8e76bdSTimur Tabi boot. See the documentation file README.video for a 1216ba8e76bdSTimur Tabi description of this variable. 12177d3053fbSTimur Tabi 1218682011ffSwdenk- Keyboard Support: 1219682011ffSwdenk CONFIG_KEYBOARD 1220682011ffSwdenk 1221682011ffSwdenk Define this to enable a custom keyboard support. 1222682011ffSwdenk This simply calls drv_keyboard_init() which must be 1223682011ffSwdenk defined in your board-specific files. 1224682011ffSwdenk The only board using this so far is RBC823. 1225a6c7ad2fSwdenk 1226c609719bSwdenk- LCD Support: CONFIG_LCD 1227c609719bSwdenk 1228c609719bSwdenk Define this to enable LCD support (for output to LCD 1229c609719bSwdenk display); also select one of the supported displays 1230c609719bSwdenk by defining one of these: 1231c609719bSwdenk 123239cf4804SStelian Pop CONFIG_ATMEL_LCD: 123339cf4804SStelian Pop 123439cf4804SStelian Pop HITACHI TX09D70VM1CCA, 3.5", 240x320. 123539cf4804SStelian Pop 1236fd3103bbSwdenk CONFIG_NEC_NL6448AC33: 1237c609719bSwdenk 1238fd3103bbSwdenk NEC NL6448AC33-18. Active, color, single scan. 1239c609719bSwdenk 1240fd3103bbSwdenk CONFIG_NEC_NL6448BC20 1241c609719bSwdenk 1242fd3103bbSwdenk NEC NL6448BC20-08. 6.5", 640x480. 1243fd3103bbSwdenk Active, color, single scan. 1244fd3103bbSwdenk 1245fd3103bbSwdenk CONFIG_NEC_NL6448BC33_54 1246fd3103bbSwdenk 1247fd3103bbSwdenk NEC NL6448BC33-54. 10.4", 640x480. 1248c609719bSwdenk Active, color, single scan. 1249c609719bSwdenk 1250c609719bSwdenk CONFIG_SHARP_16x9 1251c609719bSwdenk 1252c609719bSwdenk Sharp 320x240. Active, color, single scan. 1253c609719bSwdenk It isn't 16x9, and I am not sure what it is. 1254c609719bSwdenk 1255c609719bSwdenk CONFIG_SHARP_LQ64D341 1256c609719bSwdenk 1257c609719bSwdenk Sharp LQ64D341 display, 640x480. 1258c609719bSwdenk Active, color, single scan. 1259c609719bSwdenk 1260c609719bSwdenk CONFIG_HLD1045 1261c609719bSwdenk 1262c609719bSwdenk HLD1045 display, 640x480. 1263c609719bSwdenk Active, color, single scan. 1264c609719bSwdenk 1265c609719bSwdenk CONFIG_OPTREX_BW 1266c609719bSwdenk 1267c609719bSwdenk Optrex CBL50840-2 NF-FW 99 22 M5 1268c609719bSwdenk or 1269c609719bSwdenk Hitachi LMG6912RPFC-00T 1270c609719bSwdenk or 1271c609719bSwdenk Hitachi SP14Q002 1272c609719bSwdenk 1273c609719bSwdenk 320x240. Black & white. 1274c609719bSwdenk 1275c609719bSwdenk Normally display is black on white background; define 12766d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_WHITE_ON_BLACK to get it inverted. 1277c609719bSwdenk 12787152b1d0Swdenk- Splash Screen Support: CONFIG_SPLASH_SCREEN 1279d791b1dcSwdenk 1280d791b1dcSwdenk If this option is set, the environment is checked for 1281d791b1dcSwdenk a variable "splashimage". If found, the usual display 1282d791b1dcSwdenk of logo, copyright and system information on the LCD 1283e94d2cd9Swdenk is suppressed and the BMP image at the address 1284d791b1dcSwdenk specified in "splashimage" is loaded instead. The 1285d791b1dcSwdenk console is redirected to the "nulldev", too. This 1286d791b1dcSwdenk allows for a "silent" boot where a splash screen is 1287d791b1dcSwdenk loaded very quickly after power-on. 1288d791b1dcSwdenk 12891ca298ceSMatthias Weisser CONFIG_SPLASH_SCREEN_ALIGN 12901ca298ceSMatthias Weisser 12911ca298ceSMatthias Weisser If this option is set the splash image can be freely positioned 12921ca298ceSMatthias Weisser on the screen. Environment variable "splashpos" specifies the 12931ca298ceSMatthias Weisser position as "x,y". If a positive number is given it is used as 12941ca298ceSMatthias Weisser number of pixel from left/top. If a negative number is given it 12951ca298ceSMatthias Weisser is used as number of pixel from right/bottom. You can also 12961ca298ceSMatthias Weisser specify 'm' for centering the image. 12971ca298ceSMatthias Weisser 12981ca298ceSMatthias Weisser Example: 12991ca298ceSMatthias Weisser setenv splashpos m,m 13001ca298ceSMatthias Weisser => image at center of screen 13011ca298ceSMatthias Weisser 13021ca298ceSMatthias Weisser setenv splashpos 30,20 13031ca298ceSMatthias Weisser => image at x = 30 and y = 20 13041ca298ceSMatthias Weisser 13051ca298ceSMatthias Weisser setenv splashpos -10,m 13061ca298ceSMatthias Weisser => vertically centered image 13071ca298ceSMatthias Weisser at x = dspWidth - bmpWidth - 9 13081ca298ceSMatthias Weisser 130998f4a3dfSStefan Roese- Gzip compressed BMP image support: CONFIG_VIDEO_BMP_GZIP 131098f4a3dfSStefan Roese 131198f4a3dfSStefan Roese If this option is set, additionally to standard BMP 131298f4a3dfSStefan Roese images, gzipped BMP images can be displayed via the 131398f4a3dfSStefan Roese splashscreen support or the bmp command. 131498f4a3dfSStefan Roese 1315d5011762SAnatolij Gustschin- Run length encoded BMP image (RLE8) support: CONFIG_VIDEO_BMP_RLE8 1316d5011762SAnatolij Gustschin 1317d5011762SAnatolij Gustschin If this option is set, 8-bit RLE compressed BMP images 1318d5011762SAnatolij Gustschin can be displayed via the splashscreen support or the 1319d5011762SAnatolij Gustschin bmp command. 1320d5011762SAnatolij Gustschin 1321c29fdfc1Swdenk- Compression support: 1322c29fdfc1Swdenk CONFIG_BZIP2 1323c29fdfc1Swdenk 1324c29fdfc1Swdenk If this option is set, support for bzip2 compressed 1325c29fdfc1Swdenk images is included. If not, only uncompressed and gzip 1326c29fdfc1Swdenk compressed images are supported. 1327c29fdfc1Swdenk 1328c29fdfc1Swdenk NOTE: the bzip2 algorithm requires a lot of RAM, so 13296d0f6bcfSJean-Christophe PLAGNIOL-VILLARD the malloc area (as defined by CONFIG_SYS_MALLOC_LEN) should 1330c29fdfc1Swdenk be at least 4MB. 1331d791b1dcSwdenk 1332fc9c1727SLuigi 'Comio' Mantellini CONFIG_LZMA 1333fc9c1727SLuigi 'Comio' Mantellini 1334fc9c1727SLuigi 'Comio' Mantellini If this option is set, support for lzma compressed 1335fc9c1727SLuigi 'Comio' Mantellini images is included. 1336fc9c1727SLuigi 'Comio' Mantellini 1337fc9c1727SLuigi 'Comio' Mantellini Note: The LZMA algorithm adds between 2 and 4KB of code and it 1338fc9c1727SLuigi 'Comio' Mantellini requires an amount of dynamic memory that is given by the 1339fc9c1727SLuigi 'Comio' Mantellini formula: 1340fc9c1727SLuigi 'Comio' Mantellini 1341fc9c1727SLuigi 'Comio' Mantellini (1846 + 768 << (lc + lp)) * sizeof(uint16) 1342fc9c1727SLuigi 'Comio' Mantellini 1343fc9c1727SLuigi 'Comio' Mantellini Where lc and lp stand for, respectively, Literal context bits 1344fc9c1727SLuigi 'Comio' Mantellini and Literal pos bits. 1345fc9c1727SLuigi 'Comio' Mantellini 1346fc9c1727SLuigi 'Comio' Mantellini This value is upper-bounded by 14MB in the worst case. Anyway, 1347fc9c1727SLuigi 'Comio' Mantellini for a ~4MB large kernel image, we have lc=3 and lp=0 for a 1348fc9c1727SLuigi 'Comio' Mantellini total amount of (1846 + 768 << (3 + 0)) * 2 = ~41KB... that is 1349fc9c1727SLuigi 'Comio' Mantellini a very small buffer. 1350fc9c1727SLuigi 'Comio' Mantellini 1351fc9c1727SLuigi 'Comio' Mantellini Use the lzmainfo tool to determinate the lc and lp values and 1352fc9c1727SLuigi 'Comio' Mantellini then calculate the amount of needed dynamic memory (ensuring 13536d0f6bcfSJean-Christophe PLAGNIOL-VILLARD the appropriate CONFIG_SYS_MALLOC_LEN value). 1354fc9c1727SLuigi 'Comio' Mantellini 135517ea1177Swdenk- MII/PHY support: 135617ea1177Swdenk CONFIG_PHY_ADDR 135717ea1177Swdenk 135817ea1177Swdenk The address of PHY on MII bus. 135917ea1177Swdenk 136017ea1177Swdenk CONFIG_PHY_CLOCK_FREQ (ppc4xx) 136117ea1177Swdenk 136217ea1177Swdenk The clock frequency of the MII bus 136317ea1177Swdenk 136417ea1177Swdenk CONFIG_PHY_GIGE 136517ea1177Swdenk 136617ea1177Swdenk If this option is set, support for speed/duplex 136711ccc33fSMarcel Ziswiler detection of gigabit PHY is included. 136817ea1177Swdenk 136917ea1177Swdenk CONFIG_PHY_RESET_DELAY 137017ea1177Swdenk 137117ea1177Swdenk Some PHY like Intel LXT971A need extra delay after 137217ea1177Swdenk reset before any MII register access is possible. 137317ea1177Swdenk For such PHY, set this option to the usec delay 137417ea1177Swdenk required. (minimum 300usec for LXT971A) 137517ea1177Swdenk 137617ea1177Swdenk CONFIG_PHY_CMD_DELAY (ppc4xx) 137717ea1177Swdenk 137817ea1177Swdenk Some PHY like Intel LXT971A need extra delay after 137917ea1177Swdenk command issued before MII status register can be read 138017ea1177Swdenk 1381c609719bSwdenk- Ethernet address: 1382c609719bSwdenk CONFIG_ETHADDR 1383c68a05feSrichardretanubun CONFIG_ETH1ADDR 1384c609719bSwdenk CONFIG_ETH2ADDR 1385c609719bSwdenk CONFIG_ETH3ADDR 1386c68a05feSrichardretanubun CONFIG_ETH4ADDR 1387c68a05feSrichardretanubun CONFIG_ETH5ADDR 1388c609719bSwdenk 138911ccc33fSMarcel Ziswiler Define a default value for Ethernet address to use 139011ccc33fSMarcel Ziswiler for the respective Ethernet interface, in case this 1391c609719bSwdenk is not determined automatically. 1392c609719bSwdenk 1393c609719bSwdenk- IP address: 1394c609719bSwdenk CONFIG_IPADDR 1395c609719bSwdenk 1396c609719bSwdenk Define a default value for the IP address to use for 139711ccc33fSMarcel Ziswiler the default Ethernet interface, in case this is not 1398c609719bSwdenk determined through e.g. bootp. 1399c609719bSwdenk 1400c609719bSwdenk- Server IP address: 1401c609719bSwdenk CONFIG_SERVERIP 1402c609719bSwdenk 1403c609719bSwdenk Defines a default value for the IP address of a TFTP 1404c609719bSwdenk server to contact when using the "tftboot" command. 1405c609719bSwdenk 140697cfe861SRobin Getz CONFIG_KEEP_SERVERADDR 140797cfe861SRobin Getz 140897cfe861SRobin Getz Keeps the server's MAC address, in the env 'serveraddr' 140997cfe861SRobin Getz for passing to bootargs (like Linux's netconsole option) 141097cfe861SRobin Getz 141153a5c424SDavid Updegraff- Multicast TFTP Mode: 141253a5c424SDavid Updegraff CONFIG_MCAST_TFTP 141353a5c424SDavid Updegraff 141453a5c424SDavid Updegraff Defines whether you want to support multicast TFTP as per 141553a5c424SDavid Updegraff rfc-2090; for example to work with atftp. Lets lots of targets 141611ccc33fSMarcel Ziswiler tftp down the same boot image concurrently. Note: the Ethernet 141753a5c424SDavid Updegraff driver in use must provide a function: mcast() to join/leave a 141853a5c424SDavid Updegraff multicast group. 141953a5c424SDavid Updegraff 1420c609719bSwdenk- BOOTP Recovery Mode: 1421c609719bSwdenk CONFIG_BOOTP_RANDOM_DELAY 1422c609719bSwdenk 1423c609719bSwdenk If you have many targets in a network that try to 1424c609719bSwdenk boot using BOOTP, you may want to avoid that all 1425c609719bSwdenk systems send out BOOTP requests at precisely the same 1426c609719bSwdenk moment (which would happen for instance at recovery 1427c609719bSwdenk from a power failure, when all systems will try to 1428c609719bSwdenk boot, thus flooding the BOOTP server. Defining 1429c609719bSwdenk CONFIG_BOOTP_RANDOM_DELAY causes a random delay to be 1430c609719bSwdenk inserted before sending out BOOTP requests. The 14316c33c785SWolfgang Denk following delays are inserted then: 1432c609719bSwdenk 1433c609719bSwdenk 1st BOOTP request: delay 0 ... 1 sec 1434c609719bSwdenk 2nd BOOTP request: delay 0 ... 2 sec 1435c609719bSwdenk 3rd BOOTP request: delay 0 ... 4 sec 1436c609719bSwdenk 4th and following 1437c609719bSwdenk BOOTP requests: delay 0 ... 8 sec 1438c609719bSwdenk 1439fe389a82Sstroese- DHCP Advanced Options: 14401fe80d79SJon Loeliger You can fine tune the DHCP functionality by defining 14411fe80d79SJon Loeliger CONFIG_BOOTP_* symbols: 1442fe389a82Sstroese 14431fe80d79SJon Loeliger CONFIG_BOOTP_SUBNETMASK 14441fe80d79SJon Loeliger CONFIG_BOOTP_GATEWAY 14451fe80d79SJon Loeliger CONFIG_BOOTP_HOSTNAME 14461fe80d79SJon Loeliger CONFIG_BOOTP_NISDOMAIN 14471fe80d79SJon Loeliger CONFIG_BOOTP_BOOTPATH 14481fe80d79SJon Loeliger CONFIG_BOOTP_BOOTFILESIZE 14491fe80d79SJon Loeliger CONFIG_BOOTP_DNS 14501fe80d79SJon Loeliger CONFIG_BOOTP_DNS2 14511fe80d79SJon Loeliger CONFIG_BOOTP_SEND_HOSTNAME 14521fe80d79SJon Loeliger CONFIG_BOOTP_NTPSERVER 14531fe80d79SJon Loeliger CONFIG_BOOTP_TIMEOFFSET 14541fe80d79SJon Loeliger CONFIG_BOOTP_VENDOREX 1455fe389a82Sstroese 14565d110f0aSWilson Callan CONFIG_BOOTP_SERVERIP - TFTP server will be the serverip 14575d110f0aSWilson Callan environment variable, not the BOOTP server. 1458fe389a82Sstroese 1459fe389a82Sstroese CONFIG_BOOTP_DNS2 - If a DHCP client requests the DNS 1460fe389a82Sstroese serverip from a DHCP server, it is possible that more 1461fe389a82Sstroese than one DNS serverip is offered to the client. 1462fe389a82Sstroese If CONFIG_BOOTP_DNS2 is enabled, the secondary DNS 1463fe389a82Sstroese serverip will be stored in the additional environment 1464fe389a82Sstroese variable "dnsip2". The first DNS serverip is always 1465fe389a82Sstroese stored in the variable "dnsip", when CONFIG_BOOTP_DNS 14661fe80d79SJon Loeliger is defined. 1467fe389a82Sstroese 1468fe389a82Sstroese CONFIG_BOOTP_SEND_HOSTNAME - Some DHCP servers are capable 1469fe389a82Sstroese to do a dynamic update of a DNS server. To do this, they 1470fe389a82Sstroese need the hostname of the DHCP requester. 14715d110f0aSWilson Callan If CONFIG_BOOTP_SEND_HOSTNAME is defined, the content 14721fe80d79SJon Loeliger of the "hostname" environment variable is passed as 14731fe80d79SJon Loeliger option 12 to the DHCP server. 1474fe389a82Sstroese 1475d9a2f416SAras Vaichas CONFIG_BOOTP_DHCP_REQUEST_DELAY 1476d9a2f416SAras Vaichas 1477d9a2f416SAras Vaichas A 32bit value in microseconds for a delay between 1478d9a2f416SAras Vaichas receiving a "DHCP Offer" and sending the "DHCP Request". 1479d9a2f416SAras Vaichas This fixes a problem with certain DHCP servers that don't 1480d9a2f416SAras Vaichas respond 100% of the time to a "DHCP request". E.g. On an 1481d9a2f416SAras Vaichas AT91RM9200 processor running at 180MHz, this delay needed 1482d9a2f416SAras Vaichas to be *at least* 15,000 usec before a Windows Server 2003 1483d9a2f416SAras Vaichas DHCP server would reply 100% of the time. I recommend at 1484d9a2f416SAras Vaichas least 50,000 usec to be safe. The alternative is to hope 1485d9a2f416SAras Vaichas that one of the retries will be successful but note that 1486d9a2f416SAras Vaichas the DHCP timeout and retry process takes a longer than 1487d9a2f416SAras Vaichas this delay. 1488d9a2f416SAras Vaichas 1489a3d991bdSwdenk - CDP Options: 1490a3d991bdSwdenk CONFIG_CDP_DEVICE_ID 1491a3d991bdSwdenk 1492a3d991bdSwdenk The device id used in CDP trigger frames. 1493a3d991bdSwdenk 1494a3d991bdSwdenk CONFIG_CDP_DEVICE_ID_PREFIX 1495a3d991bdSwdenk 1496a3d991bdSwdenk A two character string which is prefixed to the MAC address 1497a3d991bdSwdenk of the device. 1498a3d991bdSwdenk 1499a3d991bdSwdenk CONFIG_CDP_PORT_ID 1500a3d991bdSwdenk 1501a3d991bdSwdenk A printf format string which contains the ascii name of 1502a3d991bdSwdenk the port. Normally is set to "eth%d" which sets 150311ccc33fSMarcel Ziswiler eth0 for the first Ethernet, eth1 for the second etc. 1504a3d991bdSwdenk 1505a3d991bdSwdenk CONFIG_CDP_CAPABILITIES 1506a3d991bdSwdenk 1507a3d991bdSwdenk A 32bit integer which indicates the device capabilities; 1508a3d991bdSwdenk 0x00000010 for a normal host which does not forwards. 1509a3d991bdSwdenk 1510a3d991bdSwdenk CONFIG_CDP_VERSION 1511a3d991bdSwdenk 1512a3d991bdSwdenk An ascii string containing the version of the software. 1513a3d991bdSwdenk 1514a3d991bdSwdenk CONFIG_CDP_PLATFORM 1515a3d991bdSwdenk 1516a3d991bdSwdenk An ascii string containing the name of the platform. 1517a3d991bdSwdenk 1518a3d991bdSwdenk CONFIG_CDP_TRIGGER 1519a3d991bdSwdenk 1520a3d991bdSwdenk A 32bit integer sent on the trigger. 1521a3d991bdSwdenk 1522a3d991bdSwdenk CONFIG_CDP_POWER_CONSUMPTION 1523a3d991bdSwdenk 1524a3d991bdSwdenk A 16bit integer containing the power consumption of the 1525a3d991bdSwdenk device in .1 of milliwatts. 1526a3d991bdSwdenk 1527a3d991bdSwdenk CONFIG_CDP_APPLIANCE_VLAN_TYPE 1528a3d991bdSwdenk 1529a3d991bdSwdenk A byte containing the id of the VLAN. 1530a3d991bdSwdenk 1531c609719bSwdenk- Status LED: CONFIG_STATUS_LED 1532c609719bSwdenk 1533c609719bSwdenk Several configurations allow to display the current 1534c609719bSwdenk status using a LED. For instance, the LED will blink 1535c609719bSwdenk fast while running U-Boot code, stop blinking as 1536c609719bSwdenk soon as a reply to a BOOTP request was received, and 1537c609719bSwdenk start blinking slow once the Linux kernel is running 1538c609719bSwdenk (supported by a status LED driver in the Linux 1539c609719bSwdenk kernel). Defining CONFIG_STATUS_LED enables this 1540c609719bSwdenk feature in U-Boot. 1541c609719bSwdenk 1542c609719bSwdenk- CAN Support: CONFIG_CAN_DRIVER 1543c609719bSwdenk 1544c609719bSwdenk Defining CONFIG_CAN_DRIVER enables CAN driver support 1545c609719bSwdenk on those systems that support this (optional) 1546c609719bSwdenk feature, like the TQM8xxL modules. 1547c609719bSwdenk 1548c609719bSwdenk- I2C Support: CONFIG_HARD_I2C | CONFIG_SOFT_I2C 1549c609719bSwdenk 1550b37c7e5eSwdenk These enable I2C serial bus commands. Defining either of 1551b37c7e5eSwdenk (but not both of) CONFIG_HARD_I2C or CONFIG_SOFT_I2C will 155211ccc33fSMarcel Ziswiler include the appropriate I2C driver for the selected CPU. 1553c609719bSwdenk 1554b37c7e5eSwdenk This will allow you to use i2c commands at the u-boot 1555602ad3b3SJon Loeliger command line (as long as you set CONFIG_CMD_I2C in 1556b37c7e5eSwdenk CONFIG_COMMANDS) and communicate with i2c based realtime 1557b37c7e5eSwdenk clock chips. See common/cmd_i2c.c for a description of the 1558c609719bSwdenk command line interface. 1559c609719bSwdenk 1560bb99ad6dSBen Warren CONFIG_HARD_I2C selects a hardware I2C controller. 1561c609719bSwdenk 1562b37c7e5eSwdenk CONFIG_SOFT_I2C configures u-boot to use a software (aka 1563b37c7e5eSwdenk bit-banging) driver instead of CPM or similar hardware 1564b37c7e5eSwdenk support for I2C. 1565c609719bSwdenk 1566b37c7e5eSwdenk There are several other quantities that must also be 1567b37c7e5eSwdenk defined when you define CONFIG_HARD_I2C or CONFIG_SOFT_I2C. 1568c609719bSwdenk 15696d0f6bcfSJean-Christophe PLAGNIOL-VILLARD In both cases you will need to define CONFIG_SYS_I2C_SPEED 1570b37c7e5eSwdenk to be the frequency (in Hz) at which you wish your i2c bus 15716d0f6bcfSJean-Christophe PLAGNIOL-VILLARD to run and CONFIG_SYS_I2C_SLAVE to be the address of this node (ie 157211ccc33fSMarcel Ziswiler the CPU's i2c node address). 1573c609719bSwdenk 15748d321b81SPeter Tyser Now, the u-boot i2c code for the mpc8xx 1575a47a12beSStefan Roese (arch/powerpc/cpu/mpc8xx/i2c.c) sets the CPU up as a master node 15768d321b81SPeter Tyser and so its address should therefore be cleared to 0 (See, 15778d321b81SPeter Tyser eg, MPC823e User's Manual p.16-473). So, set 15788d321b81SPeter Tyser CONFIG_SYS_I2C_SLAVE to 0. 1579b37c7e5eSwdenk 15805da71efaSEric Millbrandt CONFIG_SYS_I2C_INIT_MPC5XXX 15815da71efaSEric Millbrandt 15825da71efaSEric Millbrandt When a board is reset during an i2c bus transfer 15835da71efaSEric Millbrandt chips might think that the current transfer is still 15845da71efaSEric Millbrandt in progress. Reset the slave devices by sending start 15855da71efaSEric Millbrandt commands until the slave device responds. 15865da71efaSEric Millbrandt 1587b37c7e5eSwdenk That's all that's required for CONFIG_HARD_I2C. 1588b37c7e5eSwdenk 1589b37c7e5eSwdenk If you use the software i2c interface (CONFIG_SOFT_I2C) 1590b37c7e5eSwdenk then the following macros need to be defined (examples are 1591b37c7e5eSwdenk from include/configs/lwmon.h): 1592c609719bSwdenk 1593c609719bSwdenk I2C_INIT 1594c609719bSwdenk 1595b37c7e5eSwdenk (Optional). Any commands necessary to enable the I2C 1596c609719bSwdenk controller or configure ports. 1597c609719bSwdenk 1598b37c7e5eSwdenk eg: #define I2C_INIT (immr->im_cpm.cp_pbdir |= PB_SCL) 1599b37c7e5eSwdenk 1600c609719bSwdenk I2C_PORT 1601c609719bSwdenk 1602c609719bSwdenk (Only for MPC8260 CPU). The I/O port to use (the code 1603c609719bSwdenk assumes both bits are on the same port). Valid values 1604c609719bSwdenk are 0..3 for ports A..D. 1605c609719bSwdenk 1606c609719bSwdenk I2C_ACTIVE 1607c609719bSwdenk 1608c609719bSwdenk The code necessary to make the I2C data line active 1609c609719bSwdenk (driven). If the data line is open collector, this 1610c609719bSwdenk define can be null. 1611c609719bSwdenk 1612b37c7e5eSwdenk eg: #define I2C_ACTIVE (immr->im_cpm.cp_pbdir |= PB_SDA) 1613b37c7e5eSwdenk 1614c609719bSwdenk I2C_TRISTATE 1615c609719bSwdenk 1616c609719bSwdenk The code necessary to make the I2C data line tri-stated 1617c609719bSwdenk (inactive). If the data line is open collector, this 1618c609719bSwdenk define can be null. 1619c609719bSwdenk 1620b37c7e5eSwdenk eg: #define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA) 1621b37c7e5eSwdenk 1622c609719bSwdenk I2C_READ 1623c609719bSwdenk 1624c609719bSwdenk Code that returns TRUE if the I2C data line is high, 1625c609719bSwdenk FALSE if it is low. 1626c609719bSwdenk 1627b37c7e5eSwdenk eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0) 1628b37c7e5eSwdenk 1629c609719bSwdenk I2C_SDA(bit) 1630c609719bSwdenk 1631c609719bSwdenk If <bit> is TRUE, sets the I2C data line high. If it 1632c609719bSwdenk is FALSE, it clears it (low). 1633c609719bSwdenk 1634b37c7e5eSwdenk eg: #define I2C_SDA(bit) \ 1635b37c7e5eSwdenk if(bit) immr->im_cpm.cp_pbdat |= PB_SDA; \ 1636b37c7e5eSwdenk else immr->im_cpm.cp_pbdat &= ~PB_SDA 1637b37c7e5eSwdenk 1638c609719bSwdenk I2C_SCL(bit) 1639c609719bSwdenk 1640c609719bSwdenk If <bit> is TRUE, sets the I2C clock line high. If it 1641c609719bSwdenk is FALSE, it clears it (low). 1642c609719bSwdenk 1643b37c7e5eSwdenk eg: #define I2C_SCL(bit) \ 1644b37c7e5eSwdenk if(bit) immr->im_cpm.cp_pbdat |= PB_SCL; \ 1645b37c7e5eSwdenk else immr->im_cpm.cp_pbdat &= ~PB_SCL 1646b37c7e5eSwdenk 1647c609719bSwdenk I2C_DELAY 1648c609719bSwdenk 1649c609719bSwdenk This delay is invoked four times per clock cycle so this 1650c609719bSwdenk controls the rate of data transfer. The data rate thus 1651b37c7e5eSwdenk is 1 / (I2C_DELAY * 4). Often defined to be something 1652b37c7e5eSwdenk like: 1653b37c7e5eSwdenk 1654b37c7e5eSwdenk #define I2C_DELAY udelay(2) 1655c609719bSwdenk 1656793b5726SMike Frysinger CONFIG_SOFT_I2C_GPIO_SCL / CONFIG_SOFT_I2C_GPIO_SDA 1657793b5726SMike Frysinger 1658793b5726SMike Frysinger If your arch supports the generic GPIO framework (asm/gpio.h), 1659793b5726SMike Frysinger then you may alternatively define the two GPIOs that are to be 1660793b5726SMike Frysinger used as SCL / SDA. Any of the previous I2C_xxx macros will 1661793b5726SMike Frysinger have GPIO-based defaults assigned to them as appropriate. 1662793b5726SMike Frysinger 1663793b5726SMike Frysinger You should define these to the GPIO value as given directly to 1664793b5726SMike Frysinger the generic GPIO functions. 1665793b5726SMike Frysinger 16666d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_I2C_INIT_BOARD 166747cd00faSwdenk 166847cd00faSwdenk When a board is reset during an i2c bus transfer 166947cd00faSwdenk chips might think that the current transfer is still 167047cd00faSwdenk in progress. On some boards it is possible to access 167147cd00faSwdenk the i2c SCLK line directly, either by using the 167247cd00faSwdenk processor pin as a GPIO or by having a second pin 167347cd00faSwdenk connected to the bus. If this option is defined a 167447cd00faSwdenk custom i2c_init_board() routine in boards/xxx/board.c 167547cd00faSwdenk is run early in the boot sequence. 167647cd00faSwdenk 167726a33504SRichard Retanubun CONFIG_SYS_I2C_BOARD_LATE_INIT 167826a33504SRichard Retanubun 167926a33504SRichard Retanubun An alternative to CONFIG_SYS_I2C_INIT_BOARD. If this option is 168026a33504SRichard Retanubun defined a custom i2c_board_late_init() routine in 168126a33504SRichard Retanubun boards/xxx/board.c is run AFTER the operations in i2c_init() 168226a33504SRichard Retanubun is completed. This callpoint can be used to unreset i2c bus 168326a33504SRichard Retanubun using CPU i2c controller register accesses for CPUs whose i2c 168426a33504SRichard Retanubun controller provide such a method. It is called at the end of 168526a33504SRichard Retanubun i2c_init() to allow i2c_init operations to setup the i2c bus 168626a33504SRichard Retanubun controller on the CPU (e.g. setting bus speed & slave address). 168726a33504SRichard Retanubun 168817ea1177Swdenk CONFIG_I2CFAST (PPC405GP|PPC405EP only) 168917ea1177Swdenk 169017ea1177Swdenk This option enables configuration of bi_iic_fast[] flags 169117ea1177Swdenk in u-boot bd_info structure based on u-boot environment 169217ea1177Swdenk variable "i2cfast". (see also i2cfast) 169317ea1177Swdenk 1694bb99ad6dSBen Warren CONFIG_I2C_MULTI_BUS 1695bb99ad6dSBen Warren 1696bb99ad6dSBen Warren This option allows the use of multiple I2C buses, each of which 1697bb99ad6dSBen Warren must have a controller. At any point in time, only one bus is 1698bb99ad6dSBen Warren active. To switch to a different bus, use the 'i2c dev' command. 1699bb99ad6dSBen Warren Note that bus numbering is zero-based. 1700bb99ad6dSBen Warren 17016d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_I2C_NOPROBES 1702bb99ad6dSBen Warren 1703bb99ad6dSBen Warren This option specifies a list of I2C devices that will be skipped 17040f89c54bSPeter Tyser when the 'i2c probe' command is issued. If CONFIG_I2C_MULTI_BUS 17050f89c54bSPeter Tyser is set, specify a list of bus-device pairs. Otherwise, specify 17060f89c54bSPeter Tyser a 1D array of device addresses 1707bb99ad6dSBen Warren 1708bb99ad6dSBen Warren e.g. 1709bb99ad6dSBen Warren #undef CONFIG_I2C_MULTI_BUS 17106d0f6bcfSJean-Christophe PLAGNIOL-VILLARD #define CONFIG_SYS_I2C_NOPROBES {0x50,0x68} 1711bb99ad6dSBen Warren 1712bb99ad6dSBen Warren will skip addresses 0x50 and 0x68 on a board with one I2C bus 1713bb99ad6dSBen Warren 1714bb99ad6dSBen Warren #define CONFIG_I2C_MULTI_BUS 17156d0f6bcfSJean-Christophe PLAGNIOL-VILLARD #define CONFIG_SYS_I2C_MULTI_NOPROBES {{0,0x50},{0,0x68},{1,0x54}} 1716bb99ad6dSBen Warren 1717bb99ad6dSBen Warren will skip addresses 0x50 and 0x68 on bus 0 and address 0x54 on bus 1 1718bb99ad6dSBen Warren 17196d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_SPD_BUS_NUM 1720be5e6181STimur Tabi 1721be5e6181STimur Tabi If defined, then this indicates the I2C bus number for DDR SPD. 1722be5e6181STimur Tabi If not defined, then U-Boot assumes that SPD is on I2C bus 0. 1723be5e6181STimur Tabi 17246d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_RTC_BUS_NUM 17250dc018ecSStefan Roese 17260dc018ecSStefan Roese If defined, then this indicates the I2C bus number for the RTC. 17270dc018ecSStefan Roese If not defined, then U-Boot assumes that RTC is on I2C bus 0. 17280dc018ecSStefan Roese 17296d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_DTT_BUS_NUM 17300dc018ecSStefan Roese 17310dc018ecSStefan Roese If defined, then this indicates the I2C bus number for the DTT. 17320dc018ecSStefan Roese If not defined, then U-Boot assumes that DTT is on I2C bus 0. 17330dc018ecSStefan Roese 17346d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_I2C_DTT_ADDR: 17359ebbb54fSVictor Gallardo 17369ebbb54fSVictor Gallardo If defined, specifies the I2C address of the DTT device. 17379ebbb54fSVictor Gallardo If not defined, then U-Boot uses predefined value for 17389ebbb54fSVictor Gallardo specified DTT device. 17399ebbb54fSVictor Gallardo 1740be5e6181STimur Tabi CONFIG_FSL_I2C 1741be5e6181STimur Tabi 1742be5e6181STimur Tabi Define this option if you want to use Freescale's I2C driver in 17437817cb20SMarcel Ziswiler drivers/i2c/fsl_i2c.c. 1744be5e6181STimur Tabi 174567b23a32SHeiko Schocher CONFIG_I2C_MUX 174667b23a32SHeiko Schocher 174767b23a32SHeiko Schocher Define this option if you have I2C devices reached over 1 .. n 174867b23a32SHeiko Schocher I2C Muxes like the pca9544a. This option addes a new I2C 174967b23a32SHeiko Schocher Command "i2c bus [muxtype:muxaddr:muxchannel]" which adds a 175067b23a32SHeiko Schocher new I2C Bus to the existing I2C Busses. If you select the 175167b23a32SHeiko Schocher new Bus with "i2c dev", u-bbot sends first the commandos for 175267b23a32SHeiko Schocher the muxes to activate this new "bus". 175367b23a32SHeiko Schocher 175467b23a32SHeiko Schocher CONFIG_I2C_MULTI_BUS must be also defined, to use this 175567b23a32SHeiko Schocher feature! 175667b23a32SHeiko Schocher 175767b23a32SHeiko Schocher Example: 175867b23a32SHeiko Schocher Adding a new I2C Bus reached over 2 pca9544a muxes 175967b23a32SHeiko Schocher The First mux with address 70 and channel 6 176067b23a32SHeiko Schocher The Second mux with address 71 and channel 4 176167b23a32SHeiko Schocher 176267b23a32SHeiko Schocher => i2c bus pca9544a:70:6:pca9544a:71:4 176367b23a32SHeiko Schocher 176467b23a32SHeiko Schocher Use the "i2c bus" command without parameter, to get a list 176567b23a32SHeiko Schocher of I2C Busses with muxes: 176667b23a32SHeiko Schocher 176767b23a32SHeiko Schocher => i2c bus 176867b23a32SHeiko Schocher Busses reached over muxes: 176967b23a32SHeiko Schocher Bus ID: 2 177067b23a32SHeiko Schocher reached over Mux(es): 177167b23a32SHeiko Schocher pca9544a@70 ch: 4 177267b23a32SHeiko Schocher Bus ID: 3 177367b23a32SHeiko Schocher reached over Mux(es): 177467b23a32SHeiko Schocher pca9544a@70 ch: 6 177567b23a32SHeiko Schocher pca9544a@71 ch: 4 177667b23a32SHeiko Schocher => 177767b23a32SHeiko Schocher 177867b23a32SHeiko Schocher If you now switch to the new I2C Bus 3 with "i2c dev 3" 1779f9a78b8dSMichael Jones u-boot first sends the command to the mux@70 to enable 1780f9a78b8dSMichael Jones channel 6, and then the command to the mux@71 to enable 178167b23a32SHeiko Schocher the channel 4. 178267b23a32SHeiko Schocher 178367b23a32SHeiko Schocher After that, you can use the "normal" i2c commands as 1784f9a78b8dSMichael Jones usual to communicate with your I2C devices behind 178567b23a32SHeiko Schocher the 2 muxes. 178667b23a32SHeiko Schocher 178767b23a32SHeiko Schocher This option is actually implemented for the bitbanging 178867b23a32SHeiko Schocher algorithm in common/soft_i2c.c and for the Hardware I2C 178967b23a32SHeiko Schocher Bus on the MPC8260. But it should be not so difficult 179067b23a32SHeiko Schocher to add this option to other architectures. 179167b23a32SHeiko Schocher 17922ac6985aSAndrew Dyer CONFIG_SOFT_I2C_READ_REPEATED_START 17932ac6985aSAndrew Dyer 17942ac6985aSAndrew Dyer defining this will force the i2c_read() function in 17952ac6985aSAndrew Dyer the soft_i2c driver to perform an I2C repeated start 17962ac6985aSAndrew Dyer between writing the address pointer and reading the 17972ac6985aSAndrew Dyer data. If this define is omitted the default behaviour 17982ac6985aSAndrew Dyer of doing a stop-start sequence will be used. Most I2C 17992ac6985aSAndrew Dyer devices can use either method, but some require one or 18002ac6985aSAndrew Dyer the other. 1801be5e6181STimur Tabi 1802c609719bSwdenk- SPI Support: CONFIG_SPI 1803c609719bSwdenk 1804c609719bSwdenk Enables SPI driver (so far only tested with 1805c609719bSwdenk SPI EEPROM, also an instance works with Crystal A/D and 1806c609719bSwdenk D/As on the SACSng board) 1807c609719bSwdenk 18086639562eSYoshihiro Shimoda CONFIG_SH_SPI 18096639562eSYoshihiro Shimoda 18106639562eSYoshihiro Shimoda Enables the driver for SPI controller on SuperH. Currently 18116639562eSYoshihiro Shimoda only SH7757 is supported. 18126639562eSYoshihiro Shimoda 1813c609719bSwdenk CONFIG_SPI_X 1814c609719bSwdenk 1815c609719bSwdenk Enables extended (16-bit) SPI EEPROM addressing. 1816c609719bSwdenk (symmetrical to CONFIG_I2C_X) 1817c609719bSwdenk 1818c609719bSwdenk CONFIG_SOFT_SPI 1819c609719bSwdenk 1820c609719bSwdenk Enables a software (bit-bang) SPI driver rather than 1821c609719bSwdenk using hardware support. This is a general purpose 1822c609719bSwdenk driver that only requires three general I/O port pins 1823c609719bSwdenk (two outputs, one input) to function. If this is 1824c609719bSwdenk defined, the board configuration must define several 1825c609719bSwdenk SPI configuration items (port pins to use, etc). For 1826c609719bSwdenk an example, see include/configs/sacsng.h. 1827c609719bSwdenk 182804a9e118SBen Warren CONFIG_HARD_SPI 182904a9e118SBen Warren 183004a9e118SBen Warren Enables a hardware SPI driver for general-purpose reads 183104a9e118SBen Warren and writes. As with CONFIG_SOFT_SPI, the board configuration 183204a9e118SBen Warren must define a list of chip-select function pointers. 183304a9e118SBen Warren Currently supported on some MPC8xxx processors. For an 183404a9e118SBen Warren example, see include/configs/mpc8349emds.h. 183504a9e118SBen Warren 183638254f45SGuennadi Liakhovetski CONFIG_MXC_SPI 183738254f45SGuennadi Liakhovetski 183838254f45SGuennadi Liakhovetski Enables the driver for the SPI controllers on i.MX and MXC 183938254f45SGuennadi Liakhovetski SoCs. Currently only i.MX31 is supported. 184038254f45SGuennadi Liakhovetski 18410133502eSMatthias Fuchs- FPGA Support: CONFIG_FPGA 18420133502eSMatthias Fuchs 18430133502eSMatthias Fuchs Enables FPGA subsystem. 18440133502eSMatthias Fuchs 18450133502eSMatthias Fuchs CONFIG_FPGA_<vendor> 18460133502eSMatthias Fuchs 18470133502eSMatthias Fuchs Enables support for specific chip vendors. 18480133502eSMatthias Fuchs (ALTERA, XILINX) 18490133502eSMatthias Fuchs 18500133502eSMatthias Fuchs CONFIG_FPGA_<family> 18510133502eSMatthias Fuchs 18520133502eSMatthias Fuchs Enables support for FPGA family. 18530133502eSMatthias Fuchs (SPARTAN2, SPARTAN3, VIRTEX2, CYCLONE2, ACEX1K, ACEX) 18540133502eSMatthias Fuchs 18550133502eSMatthias Fuchs CONFIG_FPGA_COUNT 1856c609719bSwdenk 1857c609719bSwdenk Specify the number of FPGA devices to support. 1858c609719bSwdenk 18596d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_FPGA_PROG_FEEDBACK 1860c609719bSwdenk 1861c609719bSwdenk Enable printing of hash marks during FPGA configuration. 1862c609719bSwdenk 18636d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_FPGA_CHECK_BUSY 1864c609719bSwdenk 1865c609719bSwdenk Enable checks on FPGA configuration interface busy 1866c609719bSwdenk status by the configuration function. This option 1867c609719bSwdenk will require a board or device specific function to 1868c609719bSwdenk be written. 1869c609719bSwdenk 1870c609719bSwdenk CONFIG_FPGA_DELAY 1871c609719bSwdenk 1872c609719bSwdenk If defined, a function that provides delays in the FPGA 1873c609719bSwdenk configuration driver. 1874c609719bSwdenk 18756d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_FPGA_CHECK_CTRLC 1876c609719bSwdenk Allow Control-C to interrupt FPGA configuration 1877c609719bSwdenk 18786d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_FPGA_CHECK_ERROR 1879c609719bSwdenk 1880c609719bSwdenk Check for configuration errors during FPGA bitfile 1881c609719bSwdenk loading. For example, abort during Virtex II 1882c609719bSwdenk configuration if the INIT_B line goes low (which 1883c609719bSwdenk indicated a CRC error). 1884c609719bSwdenk 18856d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_FPGA_WAIT_INIT 1886c609719bSwdenk 1887c609719bSwdenk Maximum time to wait for the INIT_B line to deassert 1888c609719bSwdenk after PROB_B has been deasserted during a Virtex II 1889c609719bSwdenk FPGA configuration sequence. The default time is 500 189011ccc33fSMarcel Ziswiler ms. 1891c609719bSwdenk 18926d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_FPGA_WAIT_BUSY 1893c609719bSwdenk 1894c609719bSwdenk Maximum time to wait for BUSY to deassert during 189511ccc33fSMarcel Ziswiler Virtex II FPGA configuration. The default is 5 ms. 1896c609719bSwdenk 18976d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_FPGA_WAIT_CONFIG 1898c609719bSwdenk 1899c609719bSwdenk Time to wait after FPGA configuration. The default is 190011ccc33fSMarcel Ziswiler 200 ms. 1901c609719bSwdenk 1902c609719bSwdenk- Configuration Management: 1903c609719bSwdenk CONFIG_IDENT_STRING 1904c609719bSwdenk 1905c609719bSwdenk If defined, this string will be added to the U-Boot 1906c609719bSwdenk version information (U_BOOT_VERSION) 1907c609719bSwdenk 1908c609719bSwdenk- Vendor Parameter Protection: 1909c609719bSwdenk 1910c609719bSwdenk U-Boot considers the values of the environment 1911c609719bSwdenk variables "serial#" (Board Serial Number) and 19127152b1d0Swdenk "ethaddr" (Ethernet Address) to be parameters that 1913c609719bSwdenk are set once by the board vendor / manufacturer, and 1914c609719bSwdenk protects these variables from casual modification by 1915c609719bSwdenk the user. Once set, these variables are read-only, 1916c609719bSwdenk and write or delete attempts are rejected. You can 191711ccc33fSMarcel Ziswiler change this behaviour: 1918c609719bSwdenk 1919c609719bSwdenk If CONFIG_ENV_OVERWRITE is #defined in your config 1920c609719bSwdenk file, the write protection for vendor parameters is 192147cd00faSwdenk completely disabled. Anybody can change or delete 1922c609719bSwdenk these parameters. 1923c609719bSwdenk 1924c609719bSwdenk Alternatively, if you #define _both_ CONFIG_ETHADDR 1925c609719bSwdenk _and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default 192611ccc33fSMarcel Ziswiler Ethernet address is installed in the environment, 1927c609719bSwdenk which can be changed exactly ONCE by the user. [The 1928c609719bSwdenk serial# is unaffected by this, i. e. it remains 1929c609719bSwdenk read-only.] 1930c609719bSwdenk 1931c609719bSwdenk- Protected RAM: 1932c609719bSwdenk CONFIG_PRAM 1933c609719bSwdenk 1934c609719bSwdenk Define this variable to enable the reservation of 1935c609719bSwdenk "protected RAM", i. e. RAM which is not overwritten 1936c609719bSwdenk by U-Boot. Define CONFIG_PRAM to hold the number of 1937c609719bSwdenk kB you want to reserve for pRAM. You can overwrite 1938c609719bSwdenk this default value by defining an environment 1939c609719bSwdenk variable "pram" to the number of kB you want to 1940c609719bSwdenk reserve. Note that the board info structure will 1941c609719bSwdenk still show the full amount of RAM. If pRAM is 1942c609719bSwdenk reserved, a new environment variable "mem" will 1943c609719bSwdenk automatically be defined to hold the amount of 1944c609719bSwdenk remaining RAM in a form that can be passed as boot 1945c609719bSwdenk argument to Linux, for instance like that: 1946c609719bSwdenk 1947fe126d8bSWolfgang Denk setenv bootargs ... mem=\${mem} 1948c609719bSwdenk saveenv 1949c609719bSwdenk 1950c609719bSwdenk This way you can tell Linux not to use this memory, 1951c609719bSwdenk either, which results in a memory region that will 1952c609719bSwdenk not be affected by reboots. 1953c609719bSwdenk 1954c609719bSwdenk *WARNING* If your board configuration uses automatic 1955c609719bSwdenk detection of the RAM size, you must make sure that 1956c609719bSwdenk this memory test is non-destructive. So far, the 1957c609719bSwdenk following board configurations are known to be 1958c609719bSwdenk "pRAM-clean": 1959c609719bSwdenk 1960c609719bSwdenk ETX094, IVMS8, IVML24, SPD8xx, TQM8xxL, 1961c609719bSwdenk HERMES, IP860, RPXlite, LWMON, LANTEC, 1962544d97e9SWolfgang Denk FLAGADM, TQM8260 1963c609719bSwdenk 1964c609719bSwdenk- Error Recovery: 1965c609719bSwdenk CONFIG_PANIC_HANG 1966c609719bSwdenk 1967c609719bSwdenk Define this variable to stop the system in case of a 1968c609719bSwdenk fatal error, so that you have to reset it manually. 1969c609719bSwdenk This is probably NOT a good idea for an embedded 197011ccc33fSMarcel Ziswiler system where you want the system to reboot 1971c609719bSwdenk automatically as fast as possible, but it may be 1972c609719bSwdenk useful during development since you can try to debug 1973c609719bSwdenk the conditions that lead to the situation. 1974c609719bSwdenk 1975c609719bSwdenk CONFIG_NET_RETRY_COUNT 1976c609719bSwdenk 1977c609719bSwdenk This variable defines the number of retries for 1978c609719bSwdenk network operations like ARP, RARP, TFTP, or BOOTP 1979c609719bSwdenk before giving up the operation. If not defined, a 1980c609719bSwdenk default value of 5 is used. 1981c609719bSwdenk 198240cb90eeSGuennadi Liakhovetski CONFIG_ARP_TIMEOUT 198340cb90eeSGuennadi Liakhovetski 198440cb90eeSGuennadi Liakhovetski Timeout waiting for an ARP reply in milliseconds. 198540cb90eeSGuennadi Liakhovetski 1986c609719bSwdenk- Command Interpreter: 19878078f1a5SWolfgang Denk CONFIG_AUTO_COMPLETE 198804a85b3bSwdenk 198904a85b3bSwdenk Enable auto completion of commands using TAB. 199004a85b3bSwdenk 19918078f1a5SWolfgang Denk Note that this feature has NOT been implemented yet 19928078f1a5SWolfgang Denk for the "hush" shell. 19938078f1a5SWolfgang Denk 19948078f1a5SWolfgang Denk 19956d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_HUSH_PARSER 1996c609719bSwdenk 1997c609719bSwdenk Define this variable to enable the "hush" shell (from 1998c609719bSwdenk Busybox) as command line interpreter, thus enabling 1999c609719bSwdenk powerful command line syntax like 2000c609719bSwdenk if...then...else...fi conditionals or `&&' and '||' 2001c609719bSwdenk constructs ("shell scripts"). 2002c609719bSwdenk 2003c609719bSwdenk If undefined, you get the old, much simpler behaviour 2004c609719bSwdenk with a somewhat smaller memory footprint. 2005c609719bSwdenk 2006c609719bSwdenk 20076d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_PROMPT_HUSH_PS2 2008c609719bSwdenk 2009c609719bSwdenk This defines the secondary prompt string, which is 2010c609719bSwdenk printed when the command interpreter needs more input 2011c609719bSwdenk to complete a command. Usually "> ". 2012c609719bSwdenk 2013c609719bSwdenk Note: 2014c609719bSwdenk 2015c609719bSwdenk In the current implementation, the local variables 2016c609719bSwdenk space and global environment variables space are 2017c609719bSwdenk separated. Local variables are those you define by 20183b57fe0aSwdenk simply typing `name=value'. To access a local 2019c609719bSwdenk variable later on, you have write `$name' or 20203b57fe0aSwdenk `${name}'; to execute the contents of a variable 20213b57fe0aSwdenk directly type `$name' at the command prompt. 2022c609719bSwdenk 2023c609719bSwdenk Global environment variables are those you use 2024c609719bSwdenk setenv/printenv to work with. To run a command stored 2025c609719bSwdenk in such a variable, you need to use the run command, 2026c609719bSwdenk and you must not use the '$' sign to access them. 2027c609719bSwdenk 2028c609719bSwdenk To store commands and special characters in a 2029c609719bSwdenk variable, please use double quotation marks 2030c609719bSwdenk surrounding the whole text of the variable, instead 2031c609719bSwdenk of the backslashes before semicolons and special 2032c609719bSwdenk symbols. 2033c609719bSwdenk 2034aa0c71acSWolfgang Denk- Commandline Editing and History: 2035aa0c71acSWolfgang Denk CONFIG_CMDLINE_EDITING 2036aa0c71acSWolfgang Denk 203711ccc33fSMarcel Ziswiler Enable editing and History functions for interactive 2038aa0c71acSWolfgang Denk commandline input operations 2039aa0c71acSWolfgang Denk 2040a8c7c708Swdenk- Default Environment: 2041c609719bSwdenk CONFIG_EXTRA_ENV_SETTINGS 2042c609719bSwdenk 2043c609719bSwdenk Define this to contain any number of null terminated 2044c609719bSwdenk strings (variable = value pairs) that will be part of 20457152b1d0Swdenk the default environment compiled into the boot image. 20462262cfeeSwdenk 2047c609719bSwdenk For example, place something like this in your 2048c609719bSwdenk board's config file: 2049c609719bSwdenk 2050c609719bSwdenk #define CONFIG_EXTRA_ENV_SETTINGS \ 2051c609719bSwdenk "myvar1=value1\0" \ 2052c609719bSwdenk "myvar2=value2\0" 2053c609719bSwdenk 2054c609719bSwdenk Warning: This method is based on knowledge about the 2055c609719bSwdenk internal format how the environment is stored by the 20562262cfeeSwdenk U-Boot code. This is NOT an official, exported 2057c609719bSwdenk interface! Although it is unlikely that this format 20587152b1d0Swdenk will change soon, there is no guarantee either. 2059c609719bSwdenk You better know what you are doing here. 2060c609719bSwdenk 2061c609719bSwdenk Note: overly (ab)use of the default environment is 2062c609719bSwdenk discouraged. Make sure to check other ways to preset 206374de7aefSWolfgang Denk the environment like the "source" command or the 2064c609719bSwdenk boot command first. 2065c609719bSwdenk 2066a8c7c708Swdenk- DataFlash Support: 20672abbe075Swdenk CONFIG_HAS_DATAFLASH 20682abbe075Swdenk 20692abbe075Swdenk Defining this option enables DataFlash features and 20702abbe075Swdenk allows to read/write in Dataflash via the standard 20712abbe075Swdenk commands cp, md... 20722abbe075Swdenk 20733f85ce27Swdenk- SystemACE Support: 20743f85ce27Swdenk CONFIG_SYSTEMACE 20753f85ce27Swdenk 20763f85ce27Swdenk Adding this option adds support for Xilinx SystemACE 20773f85ce27Swdenk chips attached via some sort of local bus. The address 207811ccc33fSMarcel Ziswiler of the chip must also be defined in the 20796d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_SYSTEMACE_BASE macro. For example: 20803f85ce27Swdenk 20813f85ce27Swdenk #define CONFIG_SYSTEMACE 20826d0f6bcfSJean-Christophe PLAGNIOL-VILLARD #define CONFIG_SYS_SYSTEMACE_BASE 0xf0000000 20833f85ce27Swdenk 20843f85ce27Swdenk When SystemACE support is added, the "ace" device type 20853f85ce27Swdenk becomes available to the fat commands, i.e. fatls. 20863f85ce27Swdenk 2087ecb0ccd9SWolfgang Denk- TFTP Fixed UDP Port: 2088ecb0ccd9SWolfgang Denk CONFIG_TFTP_PORT 2089ecb0ccd9SWolfgang Denk 209028cb9375SWolfgang Denk If this is defined, the environment variable tftpsrcp 2091ecb0ccd9SWolfgang Denk is used to supply the TFTP UDP source port value. 209228cb9375SWolfgang Denk If tftpsrcp isn't defined, the normal pseudo-random port 2093ecb0ccd9SWolfgang Denk number generator is used. 2094ecb0ccd9SWolfgang Denk 209528cb9375SWolfgang Denk Also, the environment variable tftpdstp is used to supply 209628cb9375SWolfgang Denk the TFTP UDP destination port value. If tftpdstp isn't 209728cb9375SWolfgang Denk defined, the normal port 69 is used. 209828cb9375SWolfgang Denk 209928cb9375SWolfgang Denk The purpose for tftpsrcp is to allow a TFTP server to 2100ecb0ccd9SWolfgang Denk blindly start the TFTP transfer using the pre-configured 2101ecb0ccd9SWolfgang Denk target IP address and UDP port. This has the effect of 2102ecb0ccd9SWolfgang Denk "punching through" the (Windows XP) firewall, allowing 2103ecb0ccd9SWolfgang Denk the remainder of the TFTP transfer to proceed normally. 2104ecb0ccd9SWolfgang Denk A better solution is to properly configure the firewall, 2105ecb0ccd9SWolfgang Denk but sometimes that is not allowed. 2106ecb0ccd9SWolfgang Denk 2107a8c7c708Swdenk- Show boot progress: 2108c609719bSwdenk CONFIG_SHOW_BOOT_PROGRESS 2109c609719bSwdenk 2110c609719bSwdenk Defining this option allows to add some board- 2111c609719bSwdenk specific code (calling a user-provided function 2112c609719bSwdenk "show_boot_progress(int)") that enables you to show 2113c609719bSwdenk the system's boot progress on some display (for 2114c609719bSwdenk example, some LED's) on your board. At the moment, 2115c609719bSwdenk the following checkpoints are implemented: 2116c609719bSwdenk 21171372cce2SMarian BalakowiczLegacy uImage format: 21181372cce2SMarian Balakowicz 2119c609719bSwdenk Arg Where When 2120c609719bSwdenk 1 common/cmd_bootm.c before attempting to boot an image 2121c609719bSwdenk -1 common/cmd_bootm.c Image header has bad magic number 2122c609719bSwdenk 2 common/cmd_bootm.c Image header has correct magic number 2123c609719bSwdenk -2 common/cmd_bootm.c Image header has bad checksum 2124c609719bSwdenk 3 common/cmd_bootm.c Image header has correct checksum 2125c609719bSwdenk -3 common/cmd_bootm.c Image data has bad checksum 2126c609719bSwdenk 4 common/cmd_bootm.c Image data has correct checksum 2127c609719bSwdenk -4 common/cmd_bootm.c Image is for unsupported architecture 2128c609719bSwdenk 5 common/cmd_bootm.c Architecture check OK 21291372cce2SMarian Balakowicz -5 common/cmd_bootm.c Wrong Image Type (not kernel, multi) 2130c609719bSwdenk 6 common/cmd_bootm.c Image Type check OK 2131c609719bSwdenk -6 common/cmd_bootm.c gunzip uncompression error 2132c609719bSwdenk -7 common/cmd_bootm.c Unimplemented compression type 2133c609719bSwdenk 7 common/cmd_bootm.c Uncompression OK 21341372cce2SMarian Balakowicz 8 common/cmd_bootm.c No uncompress/copy overwrite error 2135c609719bSwdenk -9 common/cmd_bootm.c Unsupported OS (not Linux, BSD, VxWorks, QNX) 21361372cce2SMarian Balakowicz 21371372cce2SMarian Balakowicz 9 common/image.c Start initial ramdisk verification 21381372cce2SMarian Balakowicz -10 common/image.c Ramdisk header has bad magic number 21391372cce2SMarian Balakowicz -11 common/image.c Ramdisk header has bad checksum 21401372cce2SMarian Balakowicz 10 common/image.c Ramdisk header is OK 21411372cce2SMarian Balakowicz -12 common/image.c Ramdisk data has bad checksum 21421372cce2SMarian Balakowicz 11 common/image.c Ramdisk data has correct checksum 21431372cce2SMarian Balakowicz 12 common/image.c Ramdisk verification complete, start loading 214411ccc33fSMarcel Ziswiler -13 common/image.c Wrong Image Type (not PPC Linux ramdisk) 21451372cce2SMarian Balakowicz 13 common/image.c Start multifile image verification 21461372cce2SMarian Balakowicz 14 common/image.c No initial ramdisk, no multifile, continue. 21471372cce2SMarian Balakowicz 2148ea0364f1SPeter Tyser 15 arch/<arch>/lib/bootm.c All preparation done, transferring control to OS 2149c609719bSwdenk 2150a47a12beSStefan Roese -30 arch/powerpc/lib/board.c Fatal error, hang the system 215163e73c9aSwdenk -31 post/post.c POST test failed, detected by post_output_backlog() 215263e73c9aSwdenk -32 post/post.c POST test failed, detected by post_run_single() 215363e73c9aSwdenk 2154566a494fSHeiko Schocher 34 common/cmd_doc.c before loading a Image from a DOC device 2155566a494fSHeiko Schocher -35 common/cmd_doc.c Bad usage of "doc" command 2156566a494fSHeiko Schocher 35 common/cmd_doc.c correct usage of "doc" command 2157566a494fSHeiko Schocher -36 common/cmd_doc.c No boot device 2158566a494fSHeiko Schocher 36 common/cmd_doc.c correct boot device 2159566a494fSHeiko Schocher -37 common/cmd_doc.c Unknown Chip ID on boot device 2160566a494fSHeiko Schocher 37 common/cmd_doc.c correct chip ID found, device available 2161566a494fSHeiko Schocher -38 common/cmd_doc.c Read Error on boot device 2162566a494fSHeiko Schocher 38 common/cmd_doc.c reading Image header from DOC device OK 2163566a494fSHeiko Schocher -39 common/cmd_doc.c Image header has bad magic number 2164566a494fSHeiko Schocher 39 common/cmd_doc.c Image header has correct magic number 2165566a494fSHeiko Schocher -40 common/cmd_doc.c Error reading Image from DOC device 2166566a494fSHeiko Schocher 40 common/cmd_doc.c Image header has correct magic number 2167566a494fSHeiko Schocher 41 common/cmd_ide.c before loading a Image from a IDE device 2168566a494fSHeiko Schocher -42 common/cmd_ide.c Bad usage of "ide" command 2169566a494fSHeiko Schocher 42 common/cmd_ide.c correct usage of "ide" command 2170566a494fSHeiko Schocher -43 common/cmd_ide.c No boot device 2171566a494fSHeiko Schocher 43 common/cmd_ide.c boot device found 2172566a494fSHeiko Schocher -44 common/cmd_ide.c Device not available 2173566a494fSHeiko Schocher 44 common/cmd_ide.c Device available 2174566a494fSHeiko Schocher -45 common/cmd_ide.c wrong partition selected 2175566a494fSHeiko Schocher 45 common/cmd_ide.c partition selected 2176566a494fSHeiko Schocher -46 common/cmd_ide.c Unknown partition table 2177566a494fSHeiko Schocher 46 common/cmd_ide.c valid partition table found 2178566a494fSHeiko Schocher -47 common/cmd_ide.c Invalid partition type 2179566a494fSHeiko Schocher 47 common/cmd_ide.c correct partition type 2180566a494fSHeiko Schocher -48 common/cmd_ide.c Error reading Image Header on boot device 2181566a494fSHeiko Schocher 48 common/cmd_ide.c reading Image Header from IDE device OK 2182566a494fSHeiko Schocher -49 common/cmd_ide.c Image header has bad magic number 2183566a494fSHeiko Schocher 49 common/cmd_ide.c Image header has correct magic number 2184566a494fSHeiko Schocher -50 common/cmd_ide.c Image header has bad checksum 2185566a494fSHeiko Schocher 50 common/cmd_ide.c Image header has correct checksum 2186566a494fSHeiko Schocher -51 common/cmd_ide.c Error reading Image from IDE device 2187566a494fSHeiko Schocher 51 common/cmd_ide.c reading Image from IDE device OK 2188566a494fSHeiko Schocher 52 common/cmd_nand.c before loading a Image from a NAND device 2189566a494fSHeiko Schocher -53 common/cmd_nand.c Bad usage of "nand" command 2190566a494fSHeiko Schocher 53 common/cmd_nand.c correct usage of "nand" command 2191566a494fSHeiko Schocher -54 common/cmd_nand.c No boot device 2192566a494fSHeiko Schocher 54 common/cmd_nand.c boot device found 2193566a494fSHeiko Schocher -55 common/cmd_nand.c Unknown Chip ID on boot device 2194566a494fSHeiko Schocher 55 common/cmd_nand.c correct chip ID found, device available 2195566a494fSHeiko Schocher -56 common/cmd_nand.c Error reading Image Header on boot device 2196566a494fSHeiko Schocher 56 common/cmd_nand.c reading Image Header from NAND device OK 2197566a494fSHeiko Schocher -57 common/cmd_nand.c Image header has bad magic number 2198566a494fSHeiko Schocher 57 common/cmd_nand.c Image header has correct magic number 2199566a494fSHeiko Schocher -58 common/cmd_nand.c Error reading Image from NAND device 2200566a494fSHeiko Schocher 58 common/cmd_nand.c reading Image from NAND device OK 2201c609719bSwdenk 2202566a494fSHeiko Schocher -60 common/env_common.c Environment has a bad CRC, using default 2203c609719bSwdenk 2204566a494fSHeiko Schocher 64 net/eth.c starting with Ethernet configuration. 2205566a494fSHeiko Schocher -64 net/eth.c no Ethernet found. 2206566a494fSHeiko Schocher 65 net/eth.c Ethernet found. 2207206c60cbSwdenk 2208566a494fSHeiko Schocher -80 common/cmd_net.c usage wrong 2209566a494fSHeiko Schocher 80 common/cmd_net.c before calling NetLoop() 221011ccc33fSMarcel Ziswiler -81 common/cmd_net.c some error in NetLoop() occurred 2211566a494fSHeiko Schocher 81 common/cmd_net.c NetLoop() back without error 2212566a494fSHeiko Schocher -82 common/cmd_net.c size == 0 (File with size 0 loaded) 2213566a494fSHeiko Schocher 82 common/cmd_net.c trying automatic boot 221474de7aefSWolfgang Denk 83 common/cmd_net.c running "source" command 221574de7aefSWolfgang Denk -83 common/cmd_net.c some error in automatic boot or "source" command 2216566a494fSHeiko Schocher 84 common/cmd_net.c end without errors 2217c609719bSwdenk 22181372cce2SMarian BalakowiczFIT uImage format: 22191372cce2SMarian Balakowicz 22201372cce2SMarian Balakowicz Arg Where When 22211372cce2SMarian Balakowicz 100 common/cmd_bootm.c Kernel FIT Image has correct format 22221372cce2SMarian Balakowicz -100 common/cmd_bootm.c Kernel FIT Image has incorrect format 22231372cce2SMarian Balakowicz 101 common/cmd_bootm.c No Kernel subimage unit name, using configuration 22241372cce2SMarian Balakowicz -101 common/cmd_bootm.c Can't get configuration for kernel subimage 22251372cce2SMarian Balakowicz 102 common/cmd_bootm.c Kernel unit name specified 22261372cce2SMarian Balakowicz -103 common/cmd_bootm.c Can't get kernel subimage node offset 2227f773bea8SMarian Balakowicz 103 common/cmd_bootm.c Found configuration node 22281372cce2SMarian Balakowicz 104 common/cmd_bootm.c Got kernel subimage node offset 22291372cce2SMarian Balakowicz -104 common/cmd_bootm.c Kernel subimage hash verification failed 22301372cce2SMarian Balakowicz 105 common/cmd_bootm.c Kernel subimage hash verification OK 22311372cce2SMarian Balakowicz -105 common/cmd_bootm.c Kernel subimage is for unsupported architecture 22321372cce2SMarian Balakowicz 106 common/cmd_bootm.c Architecture check OK 223311ccc33fSMarcel Ziswiler -106 common/cmd_bootm.c Kernel subimage has wrong type 223411ccc33fSMarcel Ziswiler 107 common/cmd_bootm.c Kernel subimage type OK 22351372cce2SMarian Balakowicz -107 common/cmd_bootm.c Can't get kernel subimage data/size 22361372cce2SMarian Balakowicz 108 common/cmd_bootm.c Got kernel subimage data/size 22371372cce2SMarian Balakowicz -108 common/cmd_bootm.c Wrong image type (not legacy, FIT) 22381372cce2SMarian Balakowicz -109 common/cmd_bootm.c Can't get kernel subimage type 22391372cce2SMarian Balakowicz -110 common/cmd_bootm.c Can't get kernel subimage comp 22401372cce2SMarian Balakowicz -111 common/cmd_bootm.c Can't get kernel subimage os 22411372cce2SMarian Balakowicz -112 common/cmd_bootm.c Can't get kernel subimage load address 22421372cce2SMarian Balakowicz -113 common/cmd_bootm.c Image uncompress/copy overwrite error 22431372cce2SMarian Balakowicz 22441372cce2SMarian Balakowicz 120 common/image.c Start initial ramdisk verification 22451372cce2SMarian Balakowicz -120 common/image.c Ramdisk FIT image has incorrect format 22461372cce2SMarian Balakowicz 121 common/image.c Ramdisk FIT image has correct format 224711ccc33fSMarcel Ziswiler 122 common/image.c No ramdisk subimage unit name, using configuration 22481372cce2SMarian Balakowicz -122 common/image.c Can't get configuration for ramdisk subimage 22491372cce2SMarian Balakowicz 123 common/image.c Ramdisk unit name specified 22501372cce2SMarian Balakowicz -124 common/image.c Can't get ramdisk subimage node offset 22511372cce2SMarian Balakowicz 125 common/image.c Got ramdisk subimage node offset 22521372cce2SMarian Balakowicz -125 common/image.c Ramdisk subimage hash verification failed 22531372cce2SMarian Balakowicz 126 common/image.c Ramdisk subimage hash verification OK 22541372cce2SMarian Balakowicz -126 common/image.c Ramdisk subimage for unsupported architecture 22551372cce2SMarian Balakowicz 127 common/image.c Architecture check OK 22561372cce2SMarian Balakowicz -127 common/image.c Can't get ramdisk subimage data/size 22571372cce2SMarian Balakowicz 128 common/image.c Got ramdisk subimage data/size 22581372cce2SMarian Balakowicz 129 common/image.c Can't get ramdisk load address 22591372cce2SMarian Balakowicz -129 common/image.c Got ramdisk load address 22601372cce2SMarian Balakowicz 226111ccc33fSMarcel Ziswiler -130 common/cmd_doc.c Incorrect FIT image format 22621372cce2SMarian Balakowicz 131 common/cmd_doc.c FIT image format OK 22631372cce2SMarian Balakowicz 226411ccc33fSMarcel Ziswiler -140 common/cmd_ide.c Incorrect FIT image format 22651372cce2SMarian Balakowicz 141 common/cmd_ide.c FIT image format OK 22661372cce2SMarian Balakowicz 226711ccc33fSMarcel Ziswiler -150 common/cmd_nand.c Incorrect FIT image format 22681372cce2SMarian Balakowicz 151 common/cmd_nand.c FIT image format OK 22691372cce2SMarian Balakowicz 22704cf2609bSWolfgang Denk- Standalone program support: 22714cf2609bSWolfgang Denk CONFIG_STANDALONE_LOAD_ADDR 22724cf2609bSWolfgang Denk 22736feff899SWolfgang Denk This option defines a board specific value for the 22746feff899SWolfgang Denk address where standalone program gets loaded, thus 22756feff899SWolfgang Denk overwriting the architecture dependent default 22764cf2609bSWolfgang Denk settings. 22774cf2609bSWolfgang Denk 22784cf2609bSWolfgang Denk- Frame Buffer Address: 22794cf2609bSWolfgang Denk CONFIG_FB_ADDR 22804cf2609bSWolfgang Denk 22814cf2609bSWolfgang Denk Define CONFIG_FB_ADDR if you want to use specific 22824cf2609bSWolfgang Denk address for frame buffer. 22834cf2609bSWolfgang Denk Then system will reserve the frame buffer address to 22844cf2609bSWolfgang Denk defined address instead of lcd_setmem (this function 22856feff899SWolfgang Denk grabs the memory for frame buffer by panel's size). 22864cf2609bSWolfgang Denk 22874cf2609bSWolfgang Denk Please see board_init_f function. 22884cf2609bSWolfgang Denk 2289cccfc2abSDetlev Zundel- Automatic software updates via TFTP server 2290cccfc2abSDetlev Zundel CONFIG_UPDATE_TFTP 2291cccfc2abSDetlev Zundel CONFIG_UPDATE_TFTP_CNT_MAX 2292cccfc2abSDetlev Zundel CONFIG_UPDATE_TFTP_MSEC_MAX 2293cccfc2abSDetlev Zundel 2294cccfc2abSDetlev Zundel These options enable and control the auto-update feature; 2295cccfc2abSDetlev Zundel for a more detailed description refer to doc/README.update. 2296cccfc2abSDetlev Zundel 2297cccfc2abSDetlev Zundel- MTD Support (mtdparts command, UBI support) 2298cccfc2abSDetlev Zundel CONFIG_MTD_DEVICE 2299cccfc2abSDetlev Zundel 2300cccfc2abSDetlev Zundel Adds the MTD device infrastructure from the Linux kernel. 2301cccfc2abSDetlev Zundel Needed for mtdparts command support. 2302cccfc2abSDetlev Zundel 2303cccfc2abSDetlev Zundel CONFIG_MTD_PARTITIONS 2304cccfc2abSDetlev Zundel 2305cccfc2abSDetlev Zundel Adds the MTD partitioning infrastructure from the Linux 2306cccfc2abSDetlev Zundel kernel. Needed for UBI support. 2307cccfc2abSDetlev Zundel 23086a11cf48SDaniel Schwierzeck- SPL framework 23096a11cf48SDaniel Schwierzeck CONFIG_SPL 23106a11cf48SDaniel Schwierzeck Enable building of SPL globally. 23116a11cf48SDaniel Schwierzeck 23126a11cf48SDaniel Schwierzeck CONFIG_SPL_TEXT_BASE 23136a11cf48SDaniel Schwierzeck TEXT_BASE for linking the SPL binary. 23146a11cf48SDaniel Schwierzeck 23156a11cf48SDaniel Schwierzeck CONFIG_SPL_LDSCRIPT 23166a11cf48SDaniel Schwierzeck LDSCRIPT for linking the SPL binary. 23176a11cf48SDaniel Schwierzeck 23186a11cf48SDaniel Schwierzeck CONFIG_SPL_LIBCOMMON_SUPPORT 23196a11cf48SDaniel Schwierzeck Support for common/libcommon.o in SPL binary 23206a11cf48SDaniel Schwierzeck 23216a11cf48SDaniel Schwierzeck CONFIG_SPL_LIBDISK_SUPPORT 23226a11cf48SDaniel Schwierzeck Support for disk/libdisk.o in SPL binary 23236a11cf48SDaniel Schwierzeck 23246a11cf48SDaniel Schwierzeck CONFIG_SPL_I2C_SUPPORT 23256a11cf48SDaniel Schwierzeck Support for drivers/i2c/libi2c.o in SPL binary 23266a11cf48SDaniel Schwierzeck 23276a11cf48SDaniel Schwierzeck CONFIG_SPL_GPIO_SUPPORT 23286a11cf48SDaniel Schwierzeck Support for drivers/gpio/libgpio.o in SPL binary 23296a11cf48SDaniel Schwierzeck 23306a11cf48SDaniel Schwierzeck CONFIG_SPL_MMC_SUPPORT 23316a11cf48SDaniel Schwierzeck Support for drivers/mmc/libmmc.o in SPL binary 23326a11cf48SDaniel Schwierzeck 23336a11cf48SDaniel Schwierzeck CONFIG_SPL_SERIAL_SUPPORT 23346a11cf48SDaniel Schwierzeck Support for drivers/serial/libserial.o in SPL binary 23356a11cf48SDaniel Schwierzeck 23366a11cf48SDaniel Schwierzeck CONFIG_SPL_SPI_FLASH_SUPPORT 23376a11cf48SDaniel Schwierzeck Support for drivers/mtd/spi/libspi_flash.o in SPL binary 23386a11cf48SDaniel Schwierzeck 23396a11cf48SDaniel Schwierzeck CONFIG_SPL_SPI_SUPPORT 23406a11cf48SDaniel Schwierzeck Support for drivers/spi/libspi.o in SPL binary 23416a11cf48SDaniel Schwierzeck 23426a11cf48SDaniel Schwierzeck CONFIG_SPL_FAT_SUPPORT 23436a11cf48SDaniel Schwierzeck Support for fs/fat/libfat.o in SPL binary 23446a11cf48SDaniel Schwierzeck 23456a11cf48SDaniel Schwierzeck CONFIG_SPL_LIBGENERIC_SUPPORT 23466a11cf48SDaniel Schwierzeck Support for lib/libgeneric.o in SPL binary 23471372cce2SMarian Balakowicz 2348c609719bSwdenkModem Support: 2349c609719bSwdenk-------------- 2350c609719bSwdenk 2351566e5cf4SWolfgang Denk[so far only for SMDK2400 boards] 2352c609719bSwdenk 235311ccc33fSMarcel Ziswiler- Modem support enable: 2354c609719bSwdenk CONFIG_MODEM_SUPPORT 2355c609719bSwdenk 2356c609719bSwdenk- RTS/CTS Flow control enable: 2357c609719bSwdenk CONFIG_HWFLOW 2358c609719bSwdenk 2359c609719bSwdenk- Modem debug support: 2360c609719bSwdenk CONFIG_MODEM_SUPPORT_DEBUG 2361c609719bSwdenk 2362c609719bSwdenk Enables debugging stuff (char screen[1024], dbg()) 2363c609719bSwdenk for modem support. Useful only with BDI2000. 2364c609719bSwdenk 2365a8c7c708Swdenk- Interrupt support (PPC): 2366a8c7c708Swdenk 2367a8c7c708Swdenk There are common interrupt_init() and timer_interrupt() 2368a8c7c708Swdenk for all PPC archs. interrupt_init() calls interrupt_init_cpu() 236911ccc33fSMarcel Ziswiler for CPU specific initialization. interrupt_init_cpu() 2370a8c7c708Swdenk should set decrementer_count to appropriate value. If 237111ccc33fSMarcel Ziswiler CPU resets decrementer automatically after interrupt 2372a8c7c708Swdenk (ppc4xx) it should set decrementer_count to zero. 237311ccc33fSMarcel Ziswiler timer_interrupt() calls timer_interrupt_cpu() for CPU 2374a8c7c708Swdenk specific handling. If board has watchdog / status_led 2375a8c7c708Swdenk / other_activity_monitor it works automatically from 2376a8c7c708Swdenk general timer_interrupt(). 2377a8c7c708Swdenk 2378c609719bSwdenk- General: 2379c609719bSwdenk 2380c609719bSwdenk In the target system modem support is enabled when a 2381c609719bSwdenk specific key (key combination) is pressed during 2382c609719bSwdenk power-on. Otherwise U-Boot will boot normally 238311ccc33fSMarcel Ziswiler (autoboot). The key_pressed() function is called from 2384c609719bSwdenk board_init(). Currently key_pressed() is a dummy 2385c609719bSwdenk function, returning 1 and thus enabling modem 2386c609719bSwdenk initialization. 2387c609719bSwdenk 2388c609719bSwdenk If there are no modem init strings in the 2389c609719bSwdenk environment, U-Boot proceed to autoboot; the 2390c609719bSwdenk previous output (banner, info printfs) will be 239111ccc33fSMarcel Ziswiler suppressed, though. 2392c609719bSwdenk 2393c609719bSwdenk See also: doc/README.Modem 2394c609719bSwdenk 2395c609719bSwdenk 2396c609719bSwdenkConfiguration Settings: 2397c609719bSwdenk----------------------- 2398c609719bSwdenk 23996d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_LONGHELP: Defined when you want long help messages included; 2400c609719bSwdenk undefine this when you're short of memory. 2401c609719bSwdenk 24022fb2604dSPeter Tyser- CONFIG_SYS_HELP_CMD_WIDTH: Defined when you want to override the default 24032fb2604dSPeter Tyser width of the commands listed in the 'help' command output. 24042fb2604dSPeter Tyser 24056d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PROMPT: This is what U-Boot prints on the console to 2406c609719bSwdenk prompt for user input. 2407c609719bSwdenk 24086d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CBSIZE: Buffer size for input from the Console 2409c609719bSwdenk 24106d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PBSIZE: Buffer size for Console output 2411c609719bSwdenk 24126d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAXARGS: max. Number of arguments accepted for monitor commands 2413c609719bSwdenk 24146d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BARGSIZE: Buffer size for Boot Arguments which are passed to 2415c609719bSwdenk the application (usually a Linux kernel) when it is 2416c609719bSwdenk booted 2417c609719bSwdenk 24186d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BAUDRATE_TABLE: 2419c609719bSwdenk List of legal baudrate settings for this board. 2420c609719bSwdenk 24216d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_INFO_QUIET 2422c609719bSwdenk Suppress display of console information at boot. 2423c609719bSwdenk 24246d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_IS_IN_ENV 2425c609719bSwdenk If the board specific function 2426c609719bSwdenk extern int overwrite_console (void); 2427c609719bSwdenk returns 1, the stdin, stderr and stdout are switched to the 2428c609719bSwdenk serial port, else the settings in the environment are used. 2429c609719bSwdenk 24306d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE 2431c609719bSwdenk Enable the call to overwrite_console(). 2432c609719bSwdenk 24336d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_ENV_OVERWRITE 2434c609719bSwdenk Enable overwrite of previous console environment settings. 2435c609719bSwdenk 24366d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEMTEST_START, CONFIG_SYS_MEMTEST_END: 2437c609719bSwdenk Begin and End addresses of the area used by the 2438c609719bSwdenk simple memory test. 2439c609719bSwdenk 24406d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_ALT_MEMTEST: 2441c609719bSwdenk Enable an alternate, more extensive memory test. 2442c609719bSwdenk 24436d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEMTEST_SCRATCH: 24445f535fe1Swdenk Scratch address used by the alternate memory test 24455f535fe1Swdenk You only need to set this if address zero isn't writeable 24465f535fe1Swdenk 24476d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEM_TOP_HIDE (PPC only): 24486d0f6bcfSJean-Christophe PLAGNIOL-VILLARD If CONFIG_SYS_MEM_TOP_HIDE is defined in the board config header, 244914f73ca6SStefan Roese this specified memory area will get subtracted from the top 245011ccc33fSMarcel Ziswiler (end) of RAM and won't get "touched" at all by U-Boot. By 245114f73ca6SStefan Roese fixing up gd->ram_size the Linux kernel should gets passed 245214f73ca6SStefan Roese the now "corrected" memory size and won't touch it either. 245314f73ca6SStefan Roese This should work for arch/ppc and arch/powerpc. Only Linux 24545e12e75dSStefan Roese board ports in arch/powerpc with bootwrapper support that 245514f73ca6SStefan Roese recalculate the memory size from the SDRAM controller setup 24565e12e75dSStefan Roese will have to get fixed in Linux additionally. 245714f73ca6SStefan Roese 245814f73ca6SStefan Roese This option can be used as a workaround for the 440EPx/GRx 245914f73ca6SStefan Roese CHIP 11 errata where the last 256 bytes in SDRAM shouldn't 246014f73ca6SStefan Roese be touched. 246114f73ca6SStefan Roese 246214f73ca6SStefan Roese WARNING: Please make sure that this value is a multiple of 246314f73ca6SStefan Roese the Linux page size (normally 4k). If this is not the case, 246414f73ca6SStefan Roese then the end address of the Linux memory will be located at a 246514f73ca6SStefan Roese non page size aligned address and this could cause major 246614f73ca6SStefan Roese problems. 246714f73ca6SStefan Roese 24686d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_TFTP_LOADADDR: 2469c609719bSwdenk Default load address for network file downloads 2470c609719bSwdenk 24716d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_LOADS_BAUD_CHANGE: 2472c609719bSwdenk Enable temporary baudrate change while serial download 2473c609719bSwdenk 24746d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SDRAM_BASE: 2475c609719bSwdenk Physical start address of SDRAM. _Must_ be 0 here. 2476c609719bSwdenk 24776d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MBIO_BASE: 2478c609719bSwdenk Physical start address of Motherboard I/O (if using a 2479c609719bSwdenk Cogent motherboard) 2480c609719bSwdenk 24816d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_BASE: 2482c609719bSwdenk Physical start address of Flash memory. 2483c609719bSwdenk 24846d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MONITOR_BASE: 2485c609719bSwdenk Physical start address of boot monitor code (set by 2486c609719bSwdenk make config files to be same as the text base address 248714d0a02aSWolfgang Denk (CONFIG_SYS_TEXT_BASE) used when linking) - same as 24886d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_FLASH_BASE when booting from flash. 2489c609719bSwdenk 24906d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MONITOR_LEN: 24913b57fe0aSwdenk Size of memory reserved for monitor code, used to 24923b57fe0aSwdenk determine _at_compile_time_ (!) if the environment is 24933b57fe0aSwdenk embedded within the U-Boot image, or in a separate 24943b57fe0aSwdenk flash sector. 2495c609719bSwdenk 24966d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MALLOC_LEN: 2497c609719bSwdenk Size of DRAM reserved for malloc() use. 2498c609719bSwdenk 24996d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BOOTM_LEN: 250015940c9aSStefan Roese Normally compressed uImages are limited to an 250115940c9aSStefan Roese uncompressed size of 8 MBytes. If this is not enough, 25026d0f6bcfSJean-Christophe PLAGNIOL-VILLARD you can define CONFIG_SYS_BOOTM_LEN in your board config file 250315940c9aSStefan Roese to adjust this setting to your needs. 2504c609719bSwdenk 25056d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BOOTMAPSZ: 2506c609719bSwdenk Maximum size of memory mapped by the startup code of 2507c609719bSwdenk the Linux kernel; all data that must be processed by 25087d721e34SBartlomiej Sieka the Linux kernel (bd_info, boot arguments, FDT blob if 25097d721e34SBartlomiej Sieka used) must be put below this limit, unless "bootm_low" 25107d721e34SBartlomiej Sieka enviroment variable is defined and non-zero. In such case 25117d721e34SBartlomiej Sieka all data for the Linux kernel must be between "bootm_low" 2512c3624e6eSGrant Likely and "bootm_low" + CONFIG_SYS_BOOTMAPSZ. The environment 2513c3624e6eSGrant Likely variable "bootm_mapsize" will override the value of 2514c3624e6eSGrant Likely CONFIG_SYS_BOOTMAPSZ. If CONFIG_SYS_BOOTMAPSZ is undefined, 2515c3624e6eSGrant Likely then the value in "bootm_size" will be used instead. 2516c609719bSwdenk 2517fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_RAMDISK_HIGH: 2518fca43cc8SJohn Rigby Enable initrd_high functionality. If defined then the 2519fca43cc8SJohn Rigby initrd_high feature is enabled and the bootm ramdisk subcommand 2520fca43cc8SJohn Rigby is enabled. 2521fca43cc8SJohn Rigby 2522fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_GET_CMDLINE: 2523fca43cc8SJohn Rigby Enables allocating and saving kernel cmdline in space between 2524fca43cc8SJohn Rigby "bootm_low" and "bootm_low" + BOOTMAPSZ. 2525fca43cc8SJohn Rigby 2526fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_GET_KBD: 2527fca43cc8SJohn Rigby Enables allocating and saving a kernel copy of the bd_info in 2528fca43cc8SJohn Rigby space between "bootm_low" and "bootm_low" + BOOTMAPSZ. 2529fca43cc8SJohn Rigby 25306d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAX_FLASH_BANKS: 2531c609719bSwdenk Max number of Flash memory banks 2532c609719bSwdenk 25336d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAX_FLASH_SECT: 2534c609719bSwdenk Max number of sectors on a Flash chip 2535c609719bSwdenk 25366d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_ERASE_TOUT: 2537c609719bSwdenk Timeout for Flash erase operations (in ms) 2538c609719bSwdenk 25396d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_WRITE_TOUT: 2540c609719bSwdenk Timeout for Flash write operations (in ms) 2541c609719bSwdenk 25426d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_LOCK_TOUT 25438564acf9Swdenk Timeout for Flash set sector lock bit operation (in ms) 25448564acf9Swdenk 25456d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_UNLOCK_TOUT 25468564acf9Swdenk Timeout for Flash clear lock bits operation (in ms) 25478564acf9Swdenk 25486d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_PROTECTION 25498564acf9Swdenk If defined, hardware flash sectors protection is used 25508564acf9Swdenk instead of U-Boot software protection. 25518564acf9Swdenk 25526d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DIRECT_FLASH_TFTP: 2553c609719bSwdenk 2554c609719bSwdenk Enable TFTP transfers directly to flash memory; 2555c609719bSwdenk without this option such a download has to be 2556c609719bSwdenk performed in two steps: (1) download to RAM, and (2) 2557c609719bSwdenk copy from RAM to flash. 2558c609719bSwdenk 2559c609719bSwdenk The two-step approach is usually more reliable, since 2560c609719bSwdenk you can check if the download worked before you erase 256111ccc33fSMarcel Ziswiler the flash, but in some situations (when system RAM is 256211ccc33fSMarcel Ziswiler too limited to allow for a temporary copy of the 2563c609719bSwdenk downloaded image) this option may be very useful. 2564c609719bSwdenk 25656d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_CFI: 2566c609719bSwdenk Define if the flash driver uses extra elements in the 25675653fc33Swdenk common flash structure for storing flash geometry. 25685653fc33Swdenk 256900b1883aSJean-Christophe PLAGNIOL-VILLARD- CONFIG_FLASH_CFI_DRIVER 25705653fc33Swdenk This option also enables the building of the cfi_flash driver 25715653fc33Swdenk in the drivers directory 257253cf9435Sstroese 257391809ed5SPiotr Ziecik- CONFIG_FLASH_CFI_MTD 257491809ed5SPiotr Ziecik This option enables the building of the cfi_mtd driver 257591809ed5SPiotr Ziecik in the drivers directory. The driver exports CFI flash 257691809ed5SPiotr Ziecik to the MTD layer. 257791809ed5SPiotr Ziecik 25786d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_USE_BUFFER_WRITE 257996ef831fSGuennadi Liakhovetski Use buffered writes to flash. 258096ef831fSGuennadi Liakhovetski 258196ef831fSGuennadi Liakhovetski- CONFIG_FLASH_SPANSION_S29WS_N 258296ef831fSGuennadi Liakhovetski s29ws-n MirrorBit flash has non-standard addresses for buffered 258396ef831fSGuennadi Liakhovetski write commands. 258496ef831fSGuennadi Liakhovetski 25856d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_QUIET_TEST 25865568e613SStefan Roese If this option is defined, the common CFI flash doesn't 25875568e613SStefan Roese print it's warning upon not recognized FLASH banks. This 25885568e613SStefan Roese is useful, if some of the configured banks are only 25895568e613SStefan Roese optionally available. 25905568e613SStefan Roese 25919a042e9cSJerry Van Baren- CONFIG_FLASH_SHOW_PROGRESS 25929a042e9cSJerry Van Baren If defined (must be an integer), print out countdown 25939a042e9cSJerry Van Baren digits and dots. Recommended value: 45 (9..1) for 80 25949a042e9cSJerry Van Baren column displays, 15 (3..1) for 40 column displays. 25959a042e9cSJerry Van Baren 25966d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_RX_ETH_BUFFER: 259711ccc33fSMarcel Ziswiler Defines the number of Ethernet receive buffers. On some 259811ccc33fSMarcel Ziswiler Ethernet controllers it is recommended to set this value 259953cf9435Sstroese to 8 or even higher (EEPRO100 or 405 EMAC), since all 260053cf9435Sstroese buffers can be full shortly after enabling the interface 260111ccc33fSMarcel Ziswiler on high Ethernet traffic. 260253cf9435Sstroese Defaults to 4 if not defined. 2603c609719bSwdenk 2604ea882bafSWolfgang Denk- CONFIG_ENV_MAX_ENTRIES 2605ea882bafSWolfgang Denk 2606ea882bafSWolfgang Denk Maximum number of entries in the hash table that is used 2607ea882bafSWolfgang Denk internally to store the environment settings. The default 2608ea882bafSWolfgang Denk setting is supposed to be generous and should work in most 2609ea882bafSWolfgang Denk cases. This setting can be used to tune behaviour; see 2610ea882bafSWolfgang Denk lib/hashtable.c for details. 2611ea882bafSWolfgang Denk 2612c609719bSwdenkThe following definitions that deal with the placement and management 2613c609719bSwdenkof environment data (variable area); in general, we support the 2614c609719bSwdenkfollowing configurations: 2615c609719bSwdenk 2616c3eb3fe4SMike Frysinger- CONFIG_BUILD_ENVCRC: 2617c3eb3fe4SMike Frysinger 2618c3eb3fe4SMike Frysinger Builds up envcrc with the target environment so that external utils 2619c3eb3fe4SMike Frysinger may easily extract it and embed it in final U-Boot images. 2620c3eb3fe4SMike Frysinger 26215a1aceb0SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_FLASH: 2622c609719bSwdenk 2623c609719bSwdenk Define this if the environment is in flash memory. 2624c609719bSwdenk 2625c609719bSwdenk a) The environment occupies one whole flash sector, which is 2626c609719bSwdenk "embedded" in the text segment with the U-Boot code. This 2627c609719bSwdenk happens usually with "bottom boot sector" or "top boot 2628c609719bSwdenk sector" type flash chips, which have several smaller 2629c609719bSwdenk sectors at the start or the end. For instance, such a 2630c609719bSwdenk layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In 2631c609719bSwdenk such a case you would place the environment in one of the 2632c609719bSwdenk 4 kB sectors - with U-Boot code before and after it. With 2633c609719bSwdenk "top boot sector" type flash chips, you would put the 2634c609719bSwdenk environment in one of the last sectors, leaving a gap 2635c609719bSwdenk between U-Boot and the environment. 2636c609719bSwdenk 26370e8d1586SJean-Christophe PLAGNIOL-VILLARD - CONFIG_ENV_OFFSET: 2638c609719bSwdenk 2639c609719bSwdenk Offset of environment data (variable area) to the 2640c609719bSwdenk beginning of flash memory; for instance, with bottom boot 2641c609719bSwdenk type flash chips the second sector can be used: the offset 2642c609719bSwdenk for this sector is given here. 2643c609719bSwdenk 26446d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_ENV_OFFSET is used relative to CONFIG_SYS_FLASH_BASE. 2645c609719bSwdenk 26460e8d1586SJean-Christophe PLAGNIOL-VILLARD - CONFIG_ENV_ADDR: 2647c609719bSwdenk 2648c609719bSwdenk This is just another way to specify the start address of 2649c609719bSwdenk the flash sector containing the environment (instead of 26500e8d1586SJean-Christophe PLAGNIOL-VILLARD CONFIG_ENV_OFFSET). 2651c609719bSwdenk 26520e8d1586SJean-Christophe PLAGNIOL-VILLARD - CONFIG_ENV_SECT_SIZE: 2653c609719bSwdenk 2654c609719bSwdenk Size of the sector containing the environment. 2655c609719bSwdenk 2656c609719bSwdenk 2657c609719bSwdenk b) Sometimes flash chips have few, equal sized, BIG sectors. 2658c609719bSwdenk In such a case you don't want to spend a whole sector for 2659c609719bSwdenk the environment. 2660c609719bSwdenk 26610e8d1586SJean-Christophe PLAGNIOL-VILLARD - CONFIG_ENV_SIZE: 2662c609719bSwdenk 26635a1aceb0SJean-Christophe PLAGNIOL-VILLARD If you use this in combination with CONFIG_ENV_IS_IN_FLASH 26640e8d1586SJean-Christophe PLAGNIOL-VILLARD and CONFIG_ENV_SECT_SIZE, you can specify to use only a part 2665c609719bSwdenk of this flash sector for the environment. This saves 2666c609719bSwdenk memory for the RAM copy of the environment. 2667c609719bSwdenk 2668c609719bSwdenk It may also save flash memory if you decide to use this 2669c609719bSwdenk when your environment is "embedded" within U-Boot code, 2670c609719bSwdenk since then the remainder of the flash sector could be used 2671c609719bSwdenk for U-Boot code. It should be pointed out that this is 2672c609719bSwdenk STRONGLY DISCOURAGED from a robustness point of view: 2673c609719bSwdenk updating the environment in flash makes it always 2674c609719bSwdenk necessary to erase the WHOLE sector. If something goes 2675c609719bSwdenk wrong before the contents has been restored from a copy in 2676c609719bSwdenk RAM, your target system will be dead. 2677c609719bSwdenk 26780e8d1586SJean-Christophe PLAGNIOL-VILLARD - CONFIG_ENV_ADDR_REDUND 26790e8d1586SJean-Christophe PLAGNIOL-VILLARD CONFIG_ENV_SIZE_REDUND 2680c609719bSwdenk 2681c609719bSwdenk These settings describe a second storage area used to hold 268211ccc33fSMarcel Ziswiler a redundant copy of the environment data, so that there is 26833e38691eSwdenk a valid backup copy in case there is a power failure during 2684c609719bSwdenk a "saveenv" operation. 2685c609719bSwdenk 2686c609719bSwdenkBE CAREFUL! Any changes to the flash layout, and some changes to the 2687c609719bSwdenksource code will make it necessary to adapt <board>/u-boot.lds* 2688c609719bSwdenkaccordingly! 2689c609719bSwdenk 2690c609719bSwdenk 26919314cee6SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_NVRAM: 2692c609719bSwdenk 2693c609719bSwdenk Define this if you have some non-volatile memory device 2694c609719bSwdenk (NVRAM, battery buffered SRAM) which you want to use for the 2695c609719bSwdenk environment. 2696c609719bSwdenk 26970e8d1586SJean-Christophe PLAGNIOL-VILLARD - CONFIG_ENV_ADDR: 26980e8d1586SJean-Christophe PLAGNIOL-VILLARD - CONFIG_ENV_SIZE: 2699c609719bSwdenk 270011ccc33fSMarcel Ziswiler These two #defines are used to determine the memory area you 2701c609719bSwdenk want to use for environment. It is assumed that this memory 2702c609719bSwdenk can just be read and written to, without any special 2703c609719bSwdenk provision. 2704c609719bSwdenk 2705c609719bSwdenkBE CAREFUL! The first access to the environment happens quite early 2706c609719bSwdenkin U-Boot initalization (when we try to get the setting of for the 270711ccc33fSMarcel Ziswilerconsole baudrate). You *MUST* have mapped your NVRAM area then, or 2708c609719bSwdenkU-Boot will hang. 2709c609719bSwdenk 2710c609719bSwdenkPlease note that even with NVRAM we still use a copy of the 2711c609719bSwdenkenvironment in RAM: we could work on NVRAM directly, but we want to 2712c609719bSwdenkkeep settings there always unmodified except somebody uses "saveenv" 2713c609719bSwdenkto save the current settings. 2714c609719bSwdenk 2715c609719bSwdenk 2716bb1f8b4fSJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_EEPROM: 2717c609719bSwdenk 2718c609719bSwdenk Use this if you have an EEPROM or similar serial access 2719c609719bSwdenk device and a driver for it. 2720c609719bSwdenk 27210e8d1586SJean-Christophe PLAGNIOL-VILLARD - CONFIG_ENV_OFFSET: 27220e8d1586SJean-Christophe PLAGNIOL-VILLARD - CONFIG_ENV_SIZE: 2723c609719bSwdenk 2724c609719bSwdenk These two #defines specify the offset and size of the 2725c609719bSwdenk environment area within the total memory of your EEPROM. 2726c609719bSwdenk 27276d0f6bcfSJean-Christophe PLAGNIOL-VILLARD - CONFIG_SYS_I2C_EEPROM_ADDR: 2728c609719bSwdenk If defined, specified the chip address of the EEPROM device. 2729c609719bSwdenk The default address is zero. 2730c609719bSwdenk 27316d0f6bcfSJean-Christophe PLAGNIOL-VILLARD - CONFIG_SYS_EEPROM_PAGE_WRITE_BITS: 2732c609719bSwdenk If defined, the number of bits used to address bytes in a 2733c609719bSwdenk single page in the EEPROM device. A 64 byte page, for example 2734c609719bSwdenk would require six bits. 2735c609719bSwdenk 27366d0f6bcfSJean-Christophe PLAGNIOL-VILLARD - CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS: 2737c609719bSwdenk If defined, the number of milliseconds to delay between 2738c609719bSwdenk page writes. The default is zero milliseconds. 2739c609719bSwdenk 27406d0f6bcfSJean-Christophe PLAGNIOL-VILLARD - CONFIG_SYS_I2C_EEPROM_ADDR_LEN: 2741c609719bSwdenk The length in bytes of the EEPROM memory array address. Note 2742c609719bSwdenk that this is NOT the chip address length! 2743c609719bSwdenk 27446d0f6bcfSJean-Christophe PLAGNIOL-VILLARD - CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW: 27455cf91d6bSwdenk EEPROM chips that implement "address overflow" are ones 27465cf91d6bSwdenk like Catalyst 24WC04/08/16 which has 9/10/11 bits of 27475cf91d6bSwdenk address and the extra bits end up in the "chip address" bit 27485cf91d6bSwdenk slots. This makes a 24WC08 (1Kbyte) chip look like four 256 27495cf91d6bSwdenk byte chips. 27505cf91d6bSwdenk 27515cf91d6bSwdenk Note that we consider the length of the address field to 27525cf91d6bSwdenk still be one byte because the extra address bits are hidden 27535cf91d6bSwdenk in the chip address. 27545cf91d6bSwdenk 27556d0f6bcfSJean-Christophe PLAGNIOL-VILLARD - CONFIG_SYS_EEPROM_SIZE: 2756c609719bSwdenk The size in bytes of the EEPROM device. 2757c609719bSwdenk 2758548738b4SHeiko Schocher - CONFIG_ENV_EEPROM_IS_ON_I2C 2759548738b4SHeiko Schocher define this, if you have I2C and SPI activated, and your 2760548738b4SHeiko Schocher EEPROM, which holds the environment, is on the I2C bus. 2761548738b4SHeiko Schocher 2762548738b4SHeiko Schocher - CONFIG_I2C_ENV_EEPROM_BUS 2763548738b4SHeiko Schocher if you have an Environment on an EEPROM reached over 2764548738b4SHeiko Schocher I2C muxes, you can define here, how to reach this 2765548738b4SHeiko Schocher EEPROM. For example: 2766548738b4SHeiko Schocher 2767548738b4SHeiko Schocher #define CONFIG_I2C_ENV_EEPROM_BUS "pca9547:70:d\0" 2768548738b4SHeiko Schocher 2769548738b4SHeiko Schocher EEPROM which holds the environment, is reached over 2770548738b4SHeiko Schocher a pca9547 i2c mux with address 0x70, channel 3. 2771c609719bSwdenk 2772057c849cSJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_DATAFLASH: 27735779d8d9Swdenk 27745779d8d9Swdenk Define this if you have a DataFlash memory device which you 27755779d8d9Swdenk want to use for the environment. 27765779d8d9Swdenk 27770e8d1586SJean-Christophe PLAGNIOL-VILLARD - CONFIG_ENV_OFFSET: 27780e8d1586SJean-Christophe PLAGNIOL-VILLARD - CONFIG_ENV_ADDR: 27790e8d1586SJean-Christophe PLAGNIOL-VILLARD - CONFIG_ENV_SIZE: 27805779d8d9Swdenk 27815779d8d9Swdenk These three #defines specify the offset and size of the 27825779d8d9Swdenk environment area within the total memory of your DataFlash placed 27835779d8d9Swdenk at the specified address. 27845779d8d9Swdenk 278551bfee19SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_NAND: 278613a5695bSwdenk 278713a5695bSwdenk Define this if you have a NAND device which you want to use 278813a5695bSwdenk for the environment. 278913a5695bSwdenk 27900e8d1586SJean-Christophe PLAGNIOL-VILLARD - CONFIG_ENV_OFFSET: 27910e8d1586SJean-Christophe PLAGNIOL-VILLARD - CONFIG_ENV_SIZE: 279213a5695bSwdenk 279313a5695bSwdenk These two #defines specify the offset and size of the environment 2794fdd813deSScott Wood area within the first NAND device. CONFIG_ENV_OFFSET must be 2795fdd813deSScott Wood aligned to an erase block boundary. 27965779d8d9Swdenk 2797fdd813deSScott Wood - CONFIG_ENV_OFFSET_REDUND (optional): 2798e443c944SMarkus Klotzbuecher 27990e8d1586SJean-Christophe PLAGNIOL-VILLARD This setting describes a second storage area of CONFIG_ENV_SIZE 2800fdd813deSScott Wood size used to hold a redundant copy of the environment data, so 2801fdd813deSScott Wood that there is a valid backup copy in case there is a power failure 2802fdd813deSScott Wood during a "saveenv" operation. CONFIG_ENV_OFFSET_RENDUND must be 2803fdd813deSScott Wood aligned to an erase block boundary. 2804e443c944SMarkus Klotzbuecher 2805fdd813deSScott Wood - CONFIG_ENV_RANGE (optional): 2806fdd813deSScott Wood 2807fdd813deSScott Wood Specifies the length of the region in which the environment 2808fdd813deSScott Wood can be written. This should be a multiple of the NAND device's 2809fdd813deSScott Wood block size. Specifying a range with more erase blocks than 2810fdd813deSScott Wood are needed to hold CONFIG_ENV_SIZE allows bad blocks within 2811fdd813deSScott Wood the range to be avoided. 2812fdd813deSScott Wood 2813fdd813deSScott Wood - CONFIG_ENV_OFFSET_OOB (optional): 2814fdd813deSScott Wood 2815fdd813deSScott Wood Enables support for dynamically retrieving the offset of the 2816fdd813deSScott Wood environment from block zero's out-of-band data. The 2817fdd813deSScott Wood "nand env.oob" command can be used to record this offset. 2818fdd813deSScott Wood Currently, CONFIG_ENV_OFFSET_REDUND is not supported when 2819fdd813deSScott Wood using CONFIG_ENV_OFFSET_OOB. 2820e443c944SMarkus Klotzbuecher 2821b74ab737SGuennadi Liakhovetski- CONFIG_NAND_ENV_DST 2822b74ab737SGuennadi Liakhovetski 2823b74ab737SGuennadi Liakhovetski Defines address in RAM to which the nand_spl code should copy the 2824b74ab737SGuennadi Liakhovetski environment. If redundant environment is used, it will be copied to 2825b74ab737SGuennadi Liakhovetski CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE. 2826b74ab737SGuennadi Liakhovetski 28276d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPI_INIT_OFFSET 2828c609719bSwdenk 2829c609719bSwdenk Defines offset to the initial SPI buffer area in DPRAM. The 2830c609719bSwdenk area is used at an early stage (ROM part) if the environment 2831c609719bSwdenk is configured to reside in the SPI EEPROM: We need a 520 byte 2832c609719bSwdenk scratch DPRAM area. It is used between the two initialization 2833c609719bSwdenk calls (spi_init_f() and spi_init_r()). A value of 0xB00 seems 2834c609719bSwdenk to be a good choice since it makes it far enough from the 2835c609719bSwdenk start of the data area as well as from the stack pointer. 2836c609719bSwdenk 2837e881cb56SBruce AdlerPlease note that the environment is read-only until the monitor 2838c609719bSwdenkhas been relocated to RAM and a RAM copy of the environment has been 2839cdb74977SWolfgang Denkcreated; also, when using EEPROM you will have to use getenv_f() 2840c609719bSwdenkuntil then to read environment variables. 2841c609719bSwdenk 284285ec0bccSwdenkThe environment is protected by a CRC32 checksum. Before the monitor 284385ec0bccSwdenkis relocated into RAM, as a result of a bad CRC you will be working 284485ec0bccSwdenkwith the compiled-in default environment - *silently*!!! [This is 284585ec0bccSwdenknecessary, because the first environment variable we need is the 284685ec0bccSwdenk"baudrate" setting for the console - if we have a bad CRC, we don't 284785ec0bccSwdenkhave any device yet where we could complain.] 2848c609719bSwdenk 2849c609719bSwdenkNote: once the monitor has been relocated, then it will complain if 2850c609719bSwdenkthe default environment is used; a new CRC is computed as soon as you 285185ec0bccSwdenkuse the "saveenv" command to store a valid environment. 2852c609719bSwdenk 28536d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FAULT_ECHO_LINK_DOWN: 2854fc3e2165Swdenk Echo the inverted Ethernet link state to the fault LED. 2855fc3e2165Swdenk 28566d0f6bcfSJean-Christophe PLAGNIOL-VILLARD Note: If this option is active, then CONFIG_SYS_FAULT_MII_ADDR 2857fc3e2165Swdenk also needs to be defined. 2858fc3e2165Swdenk 28596d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FAULT_MII_ADDR: 2860fc3e2165Swdenk MII address of the PHY to check for the Ethernet link state. 2861c609719bSwdenk 2862f5675aa5SRon Madrid- CONFIG_NS16550_MIN_FUNCTIONS: 2863f5675aa5SRon Madrid Define this if you desire to only have use of the NS16550_init 2864f5675aa5SRon Madrid and NS16550_putc functions for the serial driver located at 2865f5675aa5SRon Madrid drivers/serial/ns16550.c. This option is useful for saving 2866f5675aa5SRon Madrid space for already greatly restricted images, including but not 2867f5675aa5SRon Madrid limited to NAND_SPL configurations. 2868f5675aa5SRon Madrid 2869c609719bSwdenkLow Level (hardware related) configuration options: 2870dc7c9a1aSwdenk--------------------------------------------------- 2871c609719bSwdenk 28726d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CACHELINE_SIZE: 2873c609719bSwdenk Cache Line Size of the CPU. 2874c609719bSwdenk 28756d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DEFAULT_IMMR: 2876c609719bSwdenk Default address of the IMMR after system reset. 28772535d602Swdenk 28782535d602Swdenk Needed on some 8260 systems (MPC8260ADS, PQ2FADS-ZU, 28792535d602Swdenk and RPXsuper) to be able to adjust the position of 28802535d602Swdenk the IMMR register after a reset. 2881c609719bSwdenk 2882e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_DEFAULT: 2883e46fedfeSTimur Tabi Default (power-on reset) physical address of CCSR on Freescale 2884e46fedfeSTimur Tabi PowerPC SOCs. 2885e46fedfeSTimur Tabi 2886e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR: 2887e46fedfeSTimur Tabi Virtual address of CCSR. On a 32-bit build, this is typically 2888e46fedfeSTimur Tabi the same value as CONFIG_SYS_CCSRBAR_DEFAULT. 2889e46fedfeSTimur Tabi 2890e46fedfeSTimur Tabi CONFIG_SYS_DEFAULT_IMMR must also be set to this value, 2891e46fedfeSTimur Tabi for cross-platform code that uses that macro instead. 2892e46fedfeSTimur Tabi 2893e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_PHYS: 2894e46fedfeSTimur Tabi Physical address of CCSR. CCSR can be relocated to a new 2895e46fedfeSTimur Tabi physical address, if desired. In this case, this macro should 2896e46fedfeSTimur Tabi be set to that address. Otherwise, it should be set to the 2897e46fedfeSTimur Tabi same value as CONFIG_SYS_CCSRBAR_DEFAULT. For example, CCSR 2898e46fedfeSTimur Tabi is typically relocated on 36-bit builds. It is recommended 2899e46fedfeSTimur Tabi that this macro be defined via the _HIGH and _LOW macros: 2900e46fedfeSTimur Tabi 2901e46fedfeSTimur Tabi #define CONFIG_SYS_CCSRBAR_PHYS ((CONFIG_SYS_CCSRBAR_PHYS_HIGH 2902e46fedfeSTimur Tabi * 1ull) << 32 | CONFIG_SYS_CCSRBAR_PHYS_LOW) 2903e46fedfeSTimur Tabi 2904e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_PHYS_HIGH: 2905e46fedfeSTimur Tabi Bits 33-36 of CONFIG_SYS_CCSRBAR_PHYS. This value is typically 2906e46fedfeSTimur Tabi either 0 (32-bit build) or 0xF (36-bit build). This macro is 2907e46fedfeSTimur Tabi used in assembly code, so it must not contain typecasts or 2908e46fedfeSTimur Tabi integer size suffixes (e.g. "ULL"). 2909e46fedfeSTimur Tabi 2910e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_PHYS_LOW: 2911e46fedfeSTimur Tabi Lower 32-bits of CONFIG_SYS_CCSRBAR_PHYS. This macro is 2912e46fedfeSTimur Tabi used in assembly code, so it must not contain typecasts or 2913e46fedfeSTimur Tabi integer size suffixes (e.g. "ULL"). 2914e46fedfeSTimur Tabi 2915e46fedfeSTimur Tabi- CONFIG_SYS_CCSR_DO_NOT_RELOCATE: 2916e46fedfeSTimur Tabi If this macro is defined, then CONFIG_SYS_CCSRBAR_PHYS will be 2917e46fedfeSTimur Tabi forced to a value that ensures that CCSR is not relocated. 2918e46fedfeSTimur Tabi 29197f6c2cbcSwdenk- Floppy Disk Support: 29206d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_FDC_DRIVE_NUMBER 29217f6c2cbcSwdenk 29227f6c2cbcSwdenk the default drive number (default value 0) 29237f6c2cbcSwdenk 29246d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_ISA_IO_STRIDE 29257f6c2cbcSwdenk 292611ccc33fSMarcel Ziswiler defines the spacing between FDC chipset registers 29277f6c2cbcSwdenk (default value 1) 29287f6c2cbcSwdenk 29296d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_ISA_IO_OFFSET 29307f6c2cbcSwdenk 29317f6c2cbcSwdenk defines the offset of register from address. It 29327f6c2cbcSwdenk depends on which part of the data bus is connected to 293311ccc33fSMarcel Ziswiler the FDC chipset. (default value 0) 29347f6c2cbcSwdenk 29356d0f6bcfSJean-Christophe PLAGNIOL-VILLARD If CONFIG_SYS_ISA_IO_STRIDE CONFIG_SYS_ISA_IO_OFFSET and 29366d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_FDC_DRIVE_NUMBER are undefined, they take their 29377f6c2cbcSwdenk default value. 29387f6c2cbcSwdenk 29396d0f6bcfSJean-Christophe PLAGNIOL-VILLARD if CONFIG_SYS_FDC_HW_INIT is defined, then the function 29407f6c2cbcSwdenk fdc_hw_init() is called at the beginning of the FDC 29417f6c2cbcSwdenk setup. fdc_hw_init() must be provided by the board 29427f6c2cbcSwdenk source code. It is used to make hardware dependant 29437f6c2cbcSwdenk initializations. 29447f6c2cbcSwdenk 29450abddf82SMacpaul Lin- CONFIG_IDE_AHB: 29460abddf82SMacpaul Lin Most IDE controllers were designed to be connected with PCI 29470abddf82SMacpaul Lin interface. Only few of them were designed for AHB interface. 29480abddf82SMacpaul Lin When software is doing ATA command and data transfer to 29490abddf82SMacpaul Lin IDE devices through IDE-AHB controller, some additional 29500abddf82SMacpaul Lin registers accessing to these kind of IDE-AHB controller 29510abddf82SMacpaul Lin is requierd. 29520abddf82SMacpaul Lin 29536d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_IMMR: Physical address of the Internal Memory. 295425d6712aSwdenk DO NOT CHANGE unless you know exactly what you're 295525d6712aSwdenk doing! (11-4) [MPC8xx/82xx systems only] 2956c609719bSwdenk 29576d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_INIT_RAM_ADDR: 2958c609719bSwdenk 29597152b1d0Swdenk Start address of memory area that can be used for 2960c609719bSwdenk initial data and stack; please note that this must be 2961c609719bSwdenk writable memory that is working WITHOUT special 2962c609719bSwdenk initialization, i. e. you CANNOT use normal RAM which 2963c609719bSwdenk will become available only after programming the 2964c609719bSwdenk memory controller and running certain initialization 2965c609719bSwdenk sequences. 2966c609719bSwdenk 2967c609719bSwdenk U-Boot uses the following memory types: 2968c609719bSwdenk - MPC8xx and MPC8260: IMMR (internal memory of the CPU) 2969c609719bSwdenk - MPC824X: data cache 2970c609719bSwdenk - PPC4xx: data cache 2971c609719bSwdenk 29726d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_GBL_DATA_OFFSET: 2973c609719bSwdenk 2974c609719bSwdenk Offset of the initial data structure in the memory 29756d0f6bcfSJean-Christophe PLAGNIOL-VILLARD area defined by CONFIG_SYS_INIT_RAM_ADDR. Usually 29766d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_GBL_DATA_OFFSET is chosen such that the initial 2977c609719bSwdenk data is located at the end of the available space 2978553f0982SWolfgang Denk (sometimes written as (CONFIG_SYS_INIT_RAM_SIZE - 29796d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_INIT_DATA_SIZE), and the initial stack is just 29806d0f6bcfSJean-Christophe PLAGNIOL-VILLARD below that area (growing from (CONFIG_SYS_INIT_RAM_ADDR + 29816d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_GBL_DATA_OFFSET) downward. 2982c609719bSwdenk 2983c609719bSwdenk Note: 2984c609719bSwdenk On the MPC824X (or other systems that use the data 2985c609719bSwdenk cache for initial memory) the address chosen for 29866d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_INIT_RAM_ADDR is basically arbitrary - it must 2987c609719bSwdenk point to an otherwise UNUSED address space between 2988c609719bSwdenk the top of RAM and the start of the PCI space. 2989c609719bSwdenk 29906d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SIUMCR: SIU Module Configuration (11-6) 2991c609719bSwdenk 29926d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SYPCR: System Protection Control (11-9) 2993c609719bSwdenk 29946d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_TBSCR: Time Base Status and Control (11-26) 2995c609719bSwdenk 29966d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PISCR: Periodic Interrupt Status and Control (11-31) 2997c609719bSwdenk 29986d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PLPRCR: PLL, Low-Power, and Reset Control Register (15-30) 2999c609719bSwdenk 30006d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SCCR: System Clock and reset Control Register (15-27) 3001c609719bSwdenk 30026d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_OR_TIMING_SDRAM: 3003c609719bSwdenk SDRAM timing 3004c609719bSwdenk 30056d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAMR_PTA: 3006c609719bSwdenk periodic timer for refresh 3007c609719bSwdenk 30086d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DER: Debug Event Register (37-47) 3009c609719bSwdenk 30106d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CONFIG_SYS_REMAP_OR_AM, 30116d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_PRELIM_OR_AM, CONFIG_SYS_OR_TIMING_FLASH, CONFIG_SYS_OR0_REMAP, 30126d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_OR0_PRELIM, CONFIG_SYS_BR0_PRELIM, CONFIG_SYS_OR1_REMAP, CONFIG_SYS_OR1_PRELIM, 30136d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_BR1_PRELIM: 3014c609719bSwdenk Memory Controller Definitions: BR0/1 and OR0/1 (FLASH) 3015c609719bSwdenk 3016c609719bSwdenk- SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE, 30176d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_OR_TIMING_SDRAM, CONFIG_SYS_OR2_PRELIM, CONFIG_SYS_BR2_PRELIM, 30186d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_OR3_PRELIM, CONFIG_SYS_BR3_PRELIM: 3019c609719bSwdenk Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM) 3020c609719bSwdenk 30216d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAMR_PTA, CONFIG_SYS_MPTPR_2BK_4K, CONFIG_SYS_MPTPR_1BK_4K, CONFIG_SYS_MPTPR_2BK_8K, 30226d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_MPTPR_1BK_8K, CONFIG_SYS_MAMR_8COL, CONFIG_SYS_MAMR_9COL: 3023c609719bSwdenk Machine Mode Register and Memory Periodic Timer 3024c609719bSwdenk Prescaler definitions (SDRAM timing) 3025c609719bSwdenk 30266d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_I2C_UCODE_PATCH, CONFIG_SYS_I2C_DPMEM_OFFSET [0x1FC0]: 3027c609719bSwdenk enable I2C microcode relocation patch (MPC8xx); 3028c609719bSwdenk define relocation offset in DPRAM [DSP2] 3029c609719bSwdenk 30306d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SMC_UCODE_PATCH, CONFIG_SYS_SMC_DPMEM_OFFSET [0x1FC0]: 3031b423d055SHeiko Schocher enable SMC microcode relocation patch (MPC8xx); 3032b423d055SHeiko Schocher define relocation offset in DPRAM [SMC1] 3033b423d055SHeiko Schocher 30346d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPI_UCODE_PATCH, CONFIG_SYS_SPI_DPMEM_OFFSET [0x1FC0]: 3035c609719bSwdenk enable SPI microcode relocation patch (MPC8xx); 3036c609719bSwdenk define relocation offset in DPRAM [SCC4] 3037c609719bSwdenk 30386d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_USE_OSCCLK: 3039c609719bSwdenk Use OSCM clock mode on MBX8xx board. Be careful, 3040c609719bSwdenk wrong setting might damage your board. Read 3041c609719bSwdenk doc/README.MBX before setting this variable! 3042c609719bSwdenk 30436d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CPM_POST_WORD_ADDR: (MPC8xx, MPC8260 only) 3044ea909b76Swdenk Offset of the bootmode word in DPRAM used by post 3045ea909b76Swdenk (Power On Self Tests). This definition overrides 3046ea909b76Swdenk #define'd default value in commproc.h resp. 3047ea909b76Swdenk cpm_8260.h. 3048ea909b76Swdenk 30496d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PCI_SLV_MEM_LOCAL, CONFIG_SYS_PCI_SLV_MEM_BUS, CONFIG_SYS_PICMR0_MASK_ATTRIB, 30506d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_PCI_MSTR0_LOCAL, CONFIG_SYS_PCIMSK0_MASK, CONFIG_SYS_PCI_MSTR1_LOCAL, 30516d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_PCIMSK1_MASK, CONFIG_SYS_PCI_MSTR_MEM_LOCAL, CONFIG_SYS_PCI_MSTR_MEM_BUS, 30526d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_CPU_PCI_MEM_START, CONFIG_SYS_PCI_MSTR_MEM_SIZE, CONFIG_SYS_POCMR0_MASK_ATTRIB, 30536d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_PCI_MSTR_MEMIO_LOCAL, CONFIG_SYS_PCI_MSTR_MEMIO_BUS, CPU_PCI_MEMIO_START, 30546d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_PCI_MSTR_MEMIO_SIZE, CONFIG_SYS_POCMR1_MASK_ATTRIB, CONFIG_SYS_PCI_MSTR_IO_LOCAL, 30556d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_PCI_MSTR_IO_BUS, CONFIG_SYS_CPU_PCI_IO_START, CONFIG_SYS_PCI_MSTR_IO_SIZE, 30566d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_POCMR2_MASK_ATTRIB: (MPC826x only) 3057a47a12beSStefan Roese Overrides the default PCI memory map in arch/powerpc/cpu/mpc8260/pci.c if set. 30585d232d0eSwdenk 30599cacf4fcSDirk Eibach- CONFIG_PCI_DISABLE_PCIE: 30609cacf4fcSDirk Eibach Disable PCI-Express on systems where it is supported but not 30619cacf4fcSDirk Eibach required. 30629cacf4fcSDirk Eibach 3063a09b9b68SKumar Gala- CONFIG_SYS_SRIO: 3064a09b9b68SKumar Gala Chip has SRIO or not 3065a09b9b68SKumar Gala 3066a09b9b68SKumar Gala- CONFIG_SRIO1: 3067a09b9b68SKumar Gala Board has SRIO 1 port available 3068a09b9b68SKumar Gala 3069a09b9b68SKumar Gala- CONFIG_SRIO2: 3070a09b9b68SKumar Gala Board has SRIO 2 port available 3071a09b9b68SKumar Gala 3072a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_VIRT: 3073a09b9b68SKumar Gala Virtual Address of SRIO port 'n' memory region 3074a09b9b68SKumar Gala 3075a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_PHYS: 3076a09b9b68SKumar Gala Physical Address of SRIO port 'n' memory region 3077a09b9b68SKumar Gala 3078a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_SIZE: 3079a09b9b68SKumar Gala Size of SRIO port 'n' memory region 3080a09b9b68SKumar Gala 3081eced4626SAlex Waterman- CONFIG_SYS_NDFC_16 3082eced4626SAlex Waterman Defined to tell the NDFC that the NAND chip is using a 3083eced4626SAlex Waterman 16 bit bus. 3084eced4626SAlex Waterman 3085eced4626SAlex Waterman- CONFIG_SYS_NDFC_EBC0_CFG 3086eced4626SAlex Waterman Sets the EBC0_CFG register for the NDFC. If not defined 3087eced4626SAlex Waterman a default value will be used. 3088eced4626SAlex Waterman 3089bb99ad6dSBen Warren- CONFIG_SPD_EEPROM 3090218ca724SWolfgang Denk Get DDR timing information from an I2C EEPROM. Common 3091218ca724SWolfgang Denk with pluggable memory modules such as SODIMMs 3092218ca724SWolfgang Denk 3093bb99ad6dSBen Warren SPD_EEPROM_ADDRESS 3094bb99ad6dSBen Warren I2C address of the SPD EEPROM 3095bb99ad6dSBen Warren 30966d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPD_BUS_NUM 3097218ca724SWolfgang Denk If SPD EEPROM is on an I2C bus other than the first 3098218ca724SWolfgang Denk one, specify here. Note that the value must resolve 3099218ca724SWolfgang Denk to something your driver can deal with. 3100bb99ad6dSBen Warren 31011b3e3c4fSYork Sun- CONFIG_SYS_DDR_RAW_TIMING 31021b3e3c4fSYork Sun Get DDR timing information from other than SPD. Common with 31031b3e3c4fSYork Sun soldered DDR chips onboard without SPD. DDR raw timing 31041b3e3c4fSYork Sun parameters are extracted from datasheet and hard-coded into 31051b3e3c4fSYork Sun header files or board specific files. 31061b3e3c4fSYork Sun 31076f5e1dc5SYork Sun- CONFIG_FSL_DDR_INTERACTIVE 31086f5e1dc5SYork Sun Enable interactive DDR debugging. See doc/README.fsl-ddr. 31096f5e1dc5SYork Sun 31106d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_83XX_DDR_USES_CS0 3111218ca724SWolfgang Denk Only for 83xx systems. If specified, then DDR should 3112218ca724SWolfgang Denk be configured using CS0 and CS1 instead of CS2 and CS3. 31132ad6b513STimur Tabi 3114c26e454dSwdenk- CONFIG_ETHER_ON_FEC[12] 3115c26e454dSwdenk Define to enable FEC[12] on a 8xx series processor. 3116c26e454dSwdenk 3117c26e454dSwdenk- CONFIG_FEC[12]_PHY 3118c26e454dSwdenk Define to the hardcoded PHY address which corresponds 31196e592385Swdenk to the given FEC; i. e. 3120c26e454dSwdenk #define CONFIG_FEC1_PHY 4 3121c26e454dSwdenk means that the PHY with address 4 is connected to FEC1 3122c26e454dSwdenk 3123c26e454dSwdenk When set to -1, means to probe for first available. 3124c26e454dSwdenk 3125c26e454dSwdenk- CONFIG_FEC[12]_PHY_NORXERR 3126c26e454dSwdenk The PHY does not have a RXERR line (RMII only). 3127c26e454dSwdenk (so program the FEC to ignore it). 3128c26e454dSwdenk 3129c26e454dSwdenk- CONFIG_RMII 3130c26e454dSwdenk Enable RMII mode for all FECs. 3131c26e454dSwdenk Note that this is a global option, we can't 3132c26e454dSwdenk have one FEC in standard MII mode and another in RMII mode. 3133c26e454dSwdenk 31345cf91d6bSwdenk- CONFIG_CRC32_VERIFY 31355cf91d6bSwdenk Add a verify option to the crc32 command. 31365cf91d6bSwdenk The syntax is: 31375cf91d6bSwdenk 31385cf91d6bSwdenk => crc32 -v <address> <count> <crc32> 31395cf91d6bSwdenk 31405cf91d6bSwdenk Where address/count indicate a memory area 31415cf91d6bSwdenk and crc32 is the correct crc32 which the 31425cf91d6bSwdenk area should have. 31435cf91d6bSwdenk 314456523f12Swdenk- CONFIG_LOOPW 314556523f12Swdenk Add the "loopw" memory command. This only takes effect if 3146602ad3b3SJon Loeliger the memory commands are activated globally (CONFIG_CMD_MEM). 314756523f12Swdenk 31487b466641Sstroese- CONFIG_MX_CYCLIC 31497b466641Sstroese Add the "mdc" and "mwc" memory commands. These are cyclic 31507b466641Sstroese "md/mw" commands. 31517b466641Sstroese Examples: 31527b466641Sstroese 31537b466641Sstroese => mdc.b 10 4 500 31547b466641Sstroese This command will print 4 bytes (10,11,12,13) each 500 ms. 31557b466641Sstroese 31567b466641Sstroese => mwc.l 100 12345678 10 31577b466641Sstroese This command will write 12345678 to address 100 all 10 ms. 31587b466641Sstroese 31597b466641Sstroese This only takes effect if the memory commands are activated 3160602ad3b3SJon Loeliger globally (CONFIG_CMD_MEM). 31617b466641Sstroese 31628aa1a2d1Swdenk- CONFIG_SKIP_LOWLEVEL_INIT 3163*afc1ce82SMacpaul Lin [ARM, NDS32, MIPS only] If this variable is defined, then certain 3164e03f3169SWolfgang Denk low level initializations (like setting up the memory 3165e03f3169SWolfgang Denk controller) are omitted and/or U-Boot does not 3166e03f3169SWolfgang Denk relocate itself into RAM. 31678aa1a2d1Swdenk 3168e03f3169SWolfgang Denk Normally this variable MUST NOT be defined. The only 3169e03f3169SWolfgang Denk exception is when U-Boot is loaded (to RAM) by some 3170e03f3169SWolfgang Denk other boot loader or by a debugger which performs 3171e03f3169SWolfgang Denk these initializations itself. 31728aa1a2d1Swdenk 3173401bb30bSAneesh V- CONFIG_SPL_BUILD 3174df81238bSMagnus Lilja Modifies the behaviour of start.S when compiling a loader 3175df81238bSMagnus Lilja that is executed before the actual U-Boot. E.g. when 3176df81238bSMagnus Lilja compiling a NAND SPL. 3177400558b5Swdenk 3178d8834a13SMatthias Weisser- CONFIG_USE_ARCH_MEMCPY 3179d8834a13SMatthias Weisser CONFIG_USE_ARCH_MEMSET 3180d8834a13SMatthias Weisser If these options are used a optimized version of memcpy/memset will 3181d8834a13SMatthias Weisser be used if available. These functions may be faster under some 3182d8834a13SMatthias Weisser conditions but may increase the binary size. 3183d8834a13SMatthias Weisser 3184c609719bSwdenkBuilding the Software: 3185c609719bSwdenk====================== 3186c609719bSwdenk 3187218ca724SWolfgang DenkBuilding U-Boot has been tested in several native build environments 3188218ca724SWolfgang Denkand in many different cross environments. Of course we cannot support 3189218ca724SWolfgang Denkall possibly existing versions of cross development tools in all 3190218ca724SWolfgang Denk(potentially obsolete) versions. In case of tool chain problems we 3191218ca724SWolfgang Denkrecommend to use the ELDK (see http://www.denx.de/wiki/DULG/ELDK) 3192218ca724SWolfgang Denkwhich is extensively used to build and test U-Boot. 3193c609719bSwdenk 3194218ca724SWolfgang DenkIf you are not using a native environment, it is assumed that you 3195218ca724SWolfgang Denkhave GNU cross compiling tools available in your path. In this case, 3196218ca724SWolfgang Denkyou must set the environment variable CROSS_COMPILE in your shell. 3197218ca724SWolfgang DenkNote that no changes to the Makefile or any other source files are 3198218ca724SWolfgang Denknecessary. For example using the ELDK on a 4xx CPU, please enter: 3199c609719bSwdenk 3200218ca724SWolfgang Denk $ CROSS_COMPILE=ppc_4xx- 3201218ca724SWolfgang Denk $ export CROSS_COMPILE 3202c609719bSwdenk 32032f8d396bSPeter TyserNote: If you wish to generate Windows versions of the utilities in 32042f8d396bSPeter Tyser the tools directory you can use the MinGW toolchain 32052f8d396bSPeter Tyser (http://www.mingw.org). Set your HOST tools to the MinGW 32062f8d396bSPeter Tyser toolchain and execute 'make tools'. For example: 32072f8d396bSPeter Tyser 32082f8d396bSPeter Tyser $ make HOSTCC=i586-mingw32msvc-gcc HOSTSTRIP=i586-mingw32msvc-strip tools 32092f8d396bSPeter Tyser 32102f8d396bSPeter Tyser Binaries such as tools/mkimage.exe will be created which can 32112f8d396bSPeter Tyser be executed on computers running Windows. 32122f8d396bSPeter Tyser 3213c609719bSwdenkU-Boot is intended to be simple to build. After installing the 3214c609719bSwdenksources you must configure U-Boot for one specific board type. This 3215c609719bSwdenkis done by typing: 3216c609719bSwdenk 3217c609719bSwdenk make NAME_config 3218c609719bSwdenk 3219218ca724SWolfgang Denkwhere "NAME_config" is the name of one of the existing configu- 3220218ca724SWolfgang Denkrations; see the main Makefile for supported names. 322154387ac9Swdenk 3222c609719bSwdenkNote: for some board special configuration names may exist; check if 3223c609719bSwdenk additional information is available from the board vendor; for 32242729af9dSwdenk instance, the TQM823L systems are available without (standard) 32252729af9dSwdenk or with LCD support. You can select such additional "features" 322611ccc33fSMarcel Ziswiler when choosing the configuration, i. e. 3227c609719bSwdenk 32282729af9dSwdenk make TQM823L_config 32292729af9dSwdenk - will configure for a plain TQM823L, i. e. no LCD support 3230c609719bSwdenk 3231c609719bSwdenk make TQM823L_LCD_config 3232c609719bSwdenk - will configure for a TQM823L with U-Boot console on LCD 3233c609719bSwdenk 3234c609719bSwdenk etc. 3235c609719bSwdenk 3236c609719bSwdenk 3237c609719bSwdenkFinally, type "make all", and you should get some working U-Boot 32387152b1d0Swdenkimages ready for download to / installation on your system: 3239c609719bSwdenk 3240c609719bSwdenk- "u-boot.bin" is a raw binary image 3241c609719bSwdenk- "u-boot" is an image in ELF binary format 3242c609719bSwdenk- "u-boot.srec" is in Motorola S-Record format 3243c609719bSwdenk 3244baf31249SMarian BalakowiczBy default the build is performed locally and the objects are saved 3245baf31249SMarian Balakowiczin the source directory. One of the two methods can be used to change 3246baf31249SMarian Balakowiczthis behavior and build U-Boot to some external directory: 3247baf31249SMarian Balakowicz 3248baf31249SMarian Balakowicz1. Add O= to the make command line invocations: 3249baf31249SMarian Balakowicz 3250baf31249SMarian Balakowicz make O=/tmp/build distclean 3251baf31249SMarian Balakowicz make O=/tmp/build NAME_config 3252baf31249SMarian Balakowicz make O=/tmp/build all 3253baf31249SMarian Balakowicz 3254baf31249SMarian Balakowicz2. Set environment variable BUILD_DIR to point to the desired location: 3255baf31249SMarian Balakowicz 3256baf31249SMarian Balakowicz export BUILD_DIR=/tmp/build 3257baf31249SMarian Balakowicz make distclean 3258baf31249SMarian Balakowicz make NAME_config 3259baf31249SMarian Balakowicz make all 3260baf31249SMarian Balakowicz 3261baf31249SMarian BalakowiczNote that the command line "O=" setting overrides the BUILD_DIR environment 3262baf31249SMarian Balakowiczvariable. 3263baf31249SMarian Balakowicz 3264c609719bSwdenk 3265c609719bSwdenkPlease be aware that the Makefiles assume you are using GNU make, so 3266c609719bSwdenkfor instance on NetBSD you might need to use "gmake" instead of 3267c609719bSwdenknative "make". 3268c609719bSwdenk 3269c609719bSwdenk 3270c609719bSwdenkIf the system board that you have is not listed, then you will need 3271c609719bSwdenkto port U-Boot to your hardware platform. To do this, follow these 3272c609719bSwdenksteps: 3273c609719bSwdenk 3274c609719bSwdenk1. Add a new configuration option for your board to the toplevel 327585ec0bccSwdenk "Makefile" and to the "MAKEALL" script, using the existing 327685ec0bccSwdenk entries as examples. Note that here and at many other places 32777152b1d0Swdenk boards and other names are listed in alphabetical sort order. Please 327885ec0bccSwdenk keep this order. 3279c609719bSwdenk2. Create a new directory to hold your board specific code. Add any 328085ec0bccSwdenk files you need. In your board directory, you will need at least 328185ec0bccSwdenk the "Makefile", a "<board>.c", "flash.c" and "u-boot.lds". 328285ec0bccSwdenk3. Create a new configuration file "include/configs/<board>.h" for 328385ec0bccSwdenk your board 3284c609719bSwdenk3. If you're porting U-Boot to a new CPU, then also create a new 3285c609719bSwdenk directory to hold your CPU specific code. Add any files you need. 328685ec0bccSwdenk4. Run "make <board>_config" with your new name. 3287c609719bSwdenk5. Type "make", and you should get a working "u-boot.srec" file 3288c609719bSwdenk to be installed on your target system. 328985ec0bccSwdenk6. Debug and solve any problems that might arise. 3290c609719bSwdenk [Of course, this last step is much harder than it sounds.] 3291c609719bSwdenk 3292c609719bSwdenk 3293c609719bSwdenkTesting of U-Boot Modifications, Ports to New Hardware, etc.: 3294c609719bSwdenk============================================================== 3295c609719bSwdenk 3296c609719bSwdenkIf you have modified U-Boot sources (for instance added a new board 3297c609719bSwdenkor support for new devices, a new CPU, etc.) you are expected to 3298c609719bSwdenkprovide feedback to the other developers. The feedback normally takes 3299c609719bSwdenkthe form of a "patch", i. e. a context diff against a certain (latest 3300218ca724SWolfgang Denkofficial or latest in the git repository) version of U-Boot sources. 3301c609719bSwdenk 3302c609719bSwdenkBut before you submit such a patch, please verify that your modifi- 3303c609719bSwdenkcation did not break existing code. At least make sure that *ALL* of 3304c609719bSwdenkthe supported boards compile WITHOUT ANY compiler warnings. To do so, 3305c609719bSwdenkjust run the "MAKEALL" script, which will configure and build U-Boot 3306c609719bSwdenkfor ALL supported system. Be warned, this will take a while. You can 33077152b1d0Swdenkselect which (cross) compiler to use by passing a `CROSS_COMPILE' 3308218ca724SWolfgang Denkenvironment variable to the script, i. e. to use the ELDK cross tools 3309218ca724SWolfgang Denkyou can type 3310c609719bSwdenk 3311c609719bSwdenk CROSS_COMPILE=ppc_8xx- MAKEALL 3312c609719bSwdenk 3313c609719bSwdenkor to build on a native PowerPC system you can type 3314c609719bSwdenk 3315c609719bSwdenk CROSS_COMPILE=' ' MAKEALL 3316c609719bSwdenk 3317218ca724SWolfgang DenkWhen using the MAKEALL script, the default behaviour is to build 3318218ca724SWolfgang DenkU-Boot in the source directory. This location can be changed by 3319218ca724SWolfgang Denksetting the BUILD_DIR environment variable. Also, for each target 3320218ca724SWolfgang Denkbuilt, the MAKEALL script saves two log files (<target>.ERR and 3321218ca724SWolfgang Denk<target>.MAKEALL) in the <source dir>/LOG directory. This default 3322218ca724SWolfgang Denklocation can be changed by setting the MAKEALL_LOGDIR environment 3323218ca724SWolfgang Denkvariable. For example: 3324baf31249SMarian Balakowicz 3325baf31249SMarian Balakowicz export BUILD_DIR=/tmp/build 3326baf31249SMarian Balakowicz export MAKEALL_LOGDIR=/tmp/log 3327baf31249SMarian Balakowicz CROSS_COMPILE=ppc_8xx- MAKEALL 3328baf31249SMarian Balakowicz 3329218ca724SWolfgang DenkWith the above settings build objects are saved in the /tmp/build, 3330218ca724SWolfgang Denklog files are saved in the /tmp/log and the source tree remains clean 3331218ca724SWolfgang Denkduring the whole build process. 3332baf31249SMarian Balakowicz 3333baf31249SMarian Balakowicz 3334c609719bSwdenkSee also "U-Boot Porting Guide" below. 3335c609719bSwdenk 3336c609719bSwdenk 3337c609719bSwdenkMonitor Commands - Overview: 3338c609719bSwdenk============================ 3339c609719bSwdenk 3340c609719bSwdenkgo - start application at address 'addr' 3341c609719bSwdenkrun - run commands in an environment variable 3342c609719bSwdenkbootm - boot application image from memory 3343c609719bSwdenkbootp - boot image via network using BootP/TFTP protocol 3344c609719bSwdenktftpboot- boot image via network using TFTP protocol 3345c609719bSwdenk and env variables "ipaddr" and "serverip" 3346c609719bSwdenk (and eventually "gatewayip") 3347c609719bSwdenkrarpboot- boot image via network using RARP/TFTP protocol 3348c609719bSwdenkdiskboot- boot from IDE devicebootd - boot default, i.e., run 'bootcmd' 3349c609719bSwdenkloads - load S-Record file over serial line 3350c609719bSwdenkloadb - load binary file over serial line (kermit mode) 3351c609719bSwdenkmd - memory display 3352c609719bSwdenkmm - memory modify (auto-incrementing) 3353c609719bSwdenknm - memory modify (constant address) 3354c609719bSwdenkmw - memory write (fill) 3355c609719bSwdenkcp - memory copy 3356c609719bSwdenkcmp - memory compare 3357c609719bSwdenkcrc32 - checksum calculation 33580f89c54bSPeter Tyseri2c - I2C sub-system 3359c609719bSwdenksspi - SPI utility commands 3360c609719bSwdenkbase - print or set address offset 3361c609719bSwdenkprintenv- print environment variables 3362c609719bSwdenksetenv - set environment variables 3363c609719bSwdenksaveenv - save environment variables to persistent storage 3364c609719bSwdenkprotect - enable or disable FLASH write protection 3365c609719bSwdenkerase - erase FLASH memory 3366c609719bSwdenkflinfo - print FLASH memory information 3367c609719bSwdenkbdinfo - print Board Info structure 3368c609719bSwdenkiminfo - print header information for application image 3369c609719bSwdenkconinfo - print console devices and informations 3370c609719bSwdenkide - IDE sub-system 3371c609719bSwdenkloop - infinite loop on address range 337256523f12Swdenkloopw - infinite write loop on address range 3373c609719bSwdenkmtest - simple RAM test 3374c609719bSwdenkicache - enable or disable instruction cache 3375c609719bSwdenkdcache - enable or disable data cache 3376c609719bSwdenkreset - Perform RESET of the CPU 3377c609719bSwdenkecho - echo args to console 3378c609719bSwdenkversion - print monitor version 3379c609719bSwdenkhelp - print online help 3380c609719bSwdenk? - alias for 'help' 3381c609719bSwdenk 3382c609719bSwdenk 3383c609719bSwdenkMonitor Commands - Detailed Description: 3384c609719bSwdenk======================================== 3385c609719bSwdenk 3386c609719bSwdenkTODO. 3387c609719bSwdenk 3388c609719bSwdenkFor now: just type "help <command>". 3389c609719bSwdenk 3390c609719bSwdenk 3391c609719bSwdenkEnvironment Variables: 3392c609719bSwdenk====================== 3393c609719bSwdenk 3394c609719bSwdenkU-Boot supports user configuration using Environment Variables which 3395c609719bSwdenkcan be made persistent by saving to Flash memory. 3396c609719bSwdenk 3397c609719bSwdenkEnvironment Variables are set using "setenv", printed using 3398c609719bSwdenk"printenv", and saved to Flash using "saveenv". Using "setenv" 3399c609719bSwdenkwithout a value can be used to delete a variable from the 3400c609719bSwdenkenvironment. As long as you don't save the environment you are 3401c609719bSwdenkworking with an in-memory copy. In case the Flash area containing the 3402c609719bSwdenkenvironment is erased by accident, a default environment is provided. 3403c609719bSwdenk 3404c96f86eeSWolfgang DenkSome configuration options can be set using Environment Variables. 3405c96f86eeSWolfgang Denk 3406c96f86eeSWolfgang DenkList of environment variables (most likely not complete): 3407c609719bSwdenk 3408c609719bSwdenk baudrate - see CONFIG_BAUDRATE 3409c609719bSwdenk 3410c609719bSwdenk bootdelay - see CONFIG_BOOTDELAY 3411c609719bSwdenk 3412c609719bSwdenk bootcmd - see CONFIG_BOOTCOMMAND 3413c609719bSwdenk 3414c609719bSwdenk bootargs - Boot arguments when booting an RTOS image 3415c609719bSwdenk 3416c609719bSwdenk bootfile - Name of the image to load with TFTP 3417c609719bSwdenk 34187d721e34SBartlomiej Sieka bootm_low - Memory range available for image processing in the bootm 34197d721e34SBartlomiej Sieka command can be restricted. This variable is given as 34207d721e34SBartlomiej Sieka a hexadecimal number and defines lowest address allowed 34217d721e34SBartlomiej Sieka for use by the bootm command. See also "bootm_size" 34227d721e34SBartlomiej Sieka environment variable. Address defined by "bootm_low" is 34237d721e34SBartlomiej Sieka also the base of the initial memory mapping for the Linux 3424c3624e6eSGrant Likely kernel -- see the description of CONFIG_SYS_BOOTMAPSZ and 3425c3624e6eSGrant Likely bootm_mapsize. 3426c3624e6eSGrant Likely 3427c3624e6eSGrant Likely bootm_mapsize - Size of the initial memory mapping for the Linux kernel. 3428c3624e6eSGrant Likely This variable is given as a hexadecimal number and it 3429c3624e6eSGrant Likely defines the size of the memory region starting at base 3430c3624e6eSGrant Likely address bootm_low that is accessible by the Linux kernel 3431c3624e6eSGrant Likely during early boot. If unset, CONFIG_SYS_BOOTMAPSZ is used 3432c3624e6eSGrant Likely as the default value if it is defined, and bootm_size is 3433c3624e6eSGrant Likely used otherwise. 34347d721e34SBartlomiej Sieka 34357d721e34SBartlomiej Sieka bootm_size - Memory range available for image processing in the bootm 34367d721e34SBartlomiej Sieka command can be restricted. This variable is given as 34377d721e34SBartlomiej Sieka a hexadecimal number and defines the size of the region 34387d721e34SBartlomiej Sieka allowed for use by the bootm command. See also "bootm_low" 34397d721e34SBartlomiej Sieka environment variable. 34407d721e34SBartlomiej Sieka 34414bae9090SBartlomiej Sieka updatefile - Location of the software update file on a TFTP server, used 34424bae9090SBartlomiej Sieka by the automatic software update feature. Please refer to 34434bae9090SBartlomiej Sieka documentation in doc/README.update for more details. 34444bae9090SBartlomiej Sieka 3445c609719bSwdenk autoload - if set to "no" (any string beginning with 'n'), 3446c609719bSwdenk "bootp" will just load perform a lookup of the 3447c609719bSwdenk configuration from the BOOTP server, but not try to 3448c609719bSwdenk load any image using TFTP 3449c609719bSwdenk 3450c609719bSwdenk autostart - if set to "yes", an image loaded using the "bootp", 3451c609719bSwdenk "rarpboot", "tftpboot" or "diskboot" commands will 3452c609719bSwdenk be automatically started (by internally calling 3453c609719bSwdenk "bootm") 3454c609719bSwdenk 34554a6fd34bSwdenk If set to "no", a standalone image passed to the 34564a6fd34bSwdenk "bootm" command will be copied to the load address 34574a6fd34bSwdenk (and eventually uncompressed), but NOT be started. 34584a6fd34bSwdenk This can be used to load and uncompress arbitrary 34594a6fd34bSwdenk data. 34604a6fd34bSwdenk 3461a28afca5SDavid A. Long fdt_high - if set this restricts the maximum address that the 3462a28afca5SDavid A. Long flattened device tree will be copied into upon boot. 3463a28afca5SDavid A. Long If this is set to the special value 0xFFFFFFFF then 3464a28afca5SDavid A. Long the fdt will not be copied at all on boot. For this 3465a28afca5SDavid A. Long to work it must reside in writable memory, have 3466a28afca5SDavid A. Long sufficient padding on the end of it for u-boot to 3467a28afca5SDavid A. Long add the information it needs into it, and the memory 3468a28afca5SDavid A. Long must be accessible by the kernel. 3469a28afca5SDavid A. Long 347017ea1177Swdenk i2cfast - (PPC405GP|PPC405EP only) 347117ea1177Swdenk if set to 'y' configures Linux I2C driver for fast 347217ea1177Swdenk mode (400kHZ). This environment variable is used in 347317ea1177Swdenk initialization code. So, for changes to be effective 347417ea1177Swdenk it must be saved and board must be reset. 347517ea1177Swdenk 3476c609719bSwdenk initrd_high - restrict positioning of initrd images: 3477c609719bSwdenk If this variable is not set, initrd images will be 3478c609719bSwdenk copied to the highest possible address in RAM; this 3479c609719bSwdenk is usually what you want since it allows for 3480c609719bSwdenk maximum initrd size. If for some reason you want to 3481c609719bSwdenk make sure that the initrd image is loaded below the 34826d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_BOOTMAPSZ limit, you can set this environment 3483c609719bSwdenk variable to a value of "no" or "off" or "0". 3484c609719bSwdenk Alternatively, you can set it to a maximum upper 3485c609719bSwdenk address to use (U-Boot will still check that it 3486c609719bSwdenk does not overwrite the U-Boot stack and data). 3487c609719bSwdenk 3488c609719bSwdenk For instance, when you have a system with 16 MB 34897152b1d0Swdenk RAM, and want to reserve 4 MB from use by Linux, 3490c609719bSwdenk you can do this by adding "mem=12M" to the value of 3491c609719bSwdenk the "bootargs" variable. However, now you must make 34927152b1d0Swdenk sure that the initrd image is placed in the first 3493c609719bSwdenk 12 MB as well - this can be done with 3494c609719bSwdenk 3495c609719bSwdenk setenv initrd_high 00c00000 3496c609719bSwdenk 349738b99261Swdenk If you set initrd_high to 0xFFFFFFFF, this is an 349838b99261Swdenk indication to U-Boot that all addresses are legal 349938b99261Swdenk for the Linux kernel, including addresses in flash 350038b99261Swdenk memory. In this case U-Boot will NOT COPY the 350138b99261Swdenk ramdisk at all. This may be useful to reduce the 350238b99261Swdenk boot time on your system, but requires that this 350338b99261Swdenk feature is supported by your Linux kernel. 350438b99261Swdenk 3505c609719bSwdenk ipaddr - IP address; needed for tftpboot command 3506c609719bSwdenk 3507c609719bSwdenk loadaddr - Default load address for commands like "bootp", 3508dc7c9a1aSwdenk "rarpboot", "tftpboot", "loadb" or "diskboot" 3509c609719bSwdenk 3510c609719bSwdenk loads_echo - see CONFIG_LOADS_ECHO 3511c609719bSwdenk 3512c609719bSwdenk serverip - TFTP server IP address; needed for tftpboot command 3513c609719bSwdenk 3514c609719bSwdenk bootretry - see CONFIG_BOOT_RETRY_TIME 3515c609719bSwdenk 3516c609719bSwdenk bootdelaykey - see CONFIG_AUTOBOOT_DELAY_STR 3517c609719bSwdenk 3518c609719bSwdenk bootstopkey - see CONFIG_AUTOBOOT_STOP_STR 3519c609719bSwdenk 3520e2a53458SMike Frysinger ethprime - controls which interface is used first. 3521a3d991bdSwdenk 3522e2a53458SMike Frysinger ethact - controls which interface is currently active. 3523e2a53458SMike Frysinger For example you can do the following 3524a3d991bdSwdenk 352548690d80SHeiko Schocher => setenv ethact FEC 352648690d80SHeiko Schocher => ping 192.168.0.1 # traffic sent on FEC 352748690d80SHeiko Schocher => setenv ethact SCC 352848690d80SHeiko Schocher => ping 10.0.0.1 # traffic sent on SCC 3529a3d991bdSwdenk 3530e1692577SMatthias Fuchs ethrotate - When set to "no" U-Boot does not go through all 3531e1692577SMatthias Fuchs available network interfaces. 3532e1692577SMatthias Fuchs It just stays at the currently selected interface. 3533e1692577SMatthias Fuchs 3534a3d991bdSwdenk netretry - When set to "no" each network operation will 3535a3d991bdSwdenk either succeed or fail without retrying. 35366e592385Swdenk When set to "once" the network operation will 35376e592385Swdenk fail when all the available network interfaces 35386e592385Swdenk are tried once without success. 3539a3d991bdSwdenk Useful on scripts which control the retry operation 3540a3d991bdSwdenk themselves. 3541a3d991bdSwdenk 3542b4e2f89dSJean-Christophe PLAGNIOL-VILLARD npe_ucode - set load address for the NPE microcode 3543a1cf027aSJean-Christophe PLAGNIOL-VILLARD 354428cb9375SWolfgang Denk tftpsrcport - If this is set, the value is used for TFTP's 3545ecb0ccd9SWolfgang Denk UDP source port. 3546ecb0ccd9SWolfgang Denk 354728cb9375SWolfgang Denk tftpdstport - If this is set, the value is used for TFTP's UDP 354828cb9375SWolfgang Denk destination port instead of the Well Know Port 69. 354928cb9375SWolfgang Denk 3550c96f86eeSWolfgang Denk tftpblocksize - Block size to use for TFTP transfers; if not set, 3551c96f86eeSWolfgang Denk we use the TFTP server's default block size 3552c96f86eeSWolfgang Denk 3553c96f86eeSWolfgang Denk tftptimeout - Retransmission timeout for TFTP packets (in milli- 3554c96f86eeSWolfgang Denk seconds, minimum value is 1000 = 1 second). Defines 3555c96f86eeSWolfgang Denk when a packet is considered to be lost so it has to 3556c96f86eeSWolfgang Denk be retransmitted. The default is 5000 = 5 seconds. 3557c96f86eeSWolfgang Denk Lowering this value may make downloads succeed 3558c96f86eeSWolfgang Denk faster in networks with high packet loss rates or 3559c96f86eeSWolfgang Denk with unreliable TFTP servers. 3560c96f86eeSWolfgang Denk 3561a3d991bdSwdenk vlan - When set to a value < 4095 the traffic over 356211ccc33fSMarcel Ziswiler Ethernet is encapsulated/received over 802.1q 3563a3d991bdSwdenk VLAN tagged frames. 3564c609719bSwdenk 3565dc0b7b0eSJason HobbsThe following image location variables contain the location of images 3566dc0b7b0eSJason Hobbsused in booting. The "Image" column gives the role of the image and is 3567dc0b7b0eSJason Hobbsnot an environment variable name. The other columns are environment 3568dc0b7b0eSJason Hobbsvariable names. "File Name" gives the name of the file on a TFTP 3569dc0b7b0eSJason Hobbsserver, "RAM Address" gives the location in RAM the image will be 3570dc0b7b0eSJason Hobbsloaded to, and "Flash Location" gives the image's address in NOR 3571dc0b7b0eSJason Hobbsflash or offset in NAND flash. 3572dc0b7b0eSJason Hobbs 3573dc0b7b0eSJason Hobbs*Note* - these variables don't have to be defined for all boards, some 3574dc0b7b0eSJason Hobbsboards currenlty use other variables for these purposes, and some 3575dc0b7b0eSJason Hobbsboards use these variables for other purposes. 3576dc0b7b0eSJason Hobbs 3577dc0b7b0eSJason HobbsImage File Name RAM Address Flash Location 3578dc0b7b0eSJason Hobbs----- --------- ----------- -------------- 3579dc0b7b0eSJason Hobbsu-boot u-boot u-boot_addr_r u-boot_addr 3580dc0b7b0eSJason HobbsLinux kernel bootfile kernel_addr_r kernel_addr 3581dc0b7b0eSJason Hobbsdevice tree blob fdtfile fdt_addr_r fdt_addr 3582dc0b7b0eSJason Hobbsramdisk ramdiskfile ramdisk_addr_r ramdisk_addr 3583dc0b7b0eSJason Hobbs 3584c609719bSwdenkThe following environment variables may be used and automatically 3585c609719bSwdenkupdated by the network boot commands ("bootp" and "rarpboot"), 3586c609719bSwdenkdepending the information provided by your boot server: 3587c609719bSwdenk 3588c609719bSwdenk bootfile - see above 3589c609719bSwdenk dnsip - IP address of your Domain Name Server 3590fe389a82Sstroese dnsip2 - IP address of your secondary Domain Name Server 3591c609719bSwdenk gatewayip - IP address of the Gateway (Router) to use 3592c609719bSwdenk hostname - Target hostname 3593c609719bSwdenk ipaddr - see above 3594c609719bSwdenk netmask - Subnet Mask 3595c609719bSwdenk rootpath - Pathname of the root filesystem on the NFS server 3596c609719bSwdenk serverip - see above 3597c609719bSwdenk 3598c609719bSwdenk 3599c609719bSwdenkThere are two special Environment Variables: 3600c609719bSwdenk 3601c609719bSwdenk serial# - contains hardware identification information such 3602c609719bSwdenk as type string and/or serial number 3603c609719bSwdenk ethaddr - Ethernet address 3604c609719bSwdenk 3605c609719bSwdenkThese variables can be set only once (usually during manufacturing of 3606c609719bSwdenkthe board). U-Boot refuses to delete or overwrite these variables 3607c609719bSwdenkonce they have been set once. 3608c609719bSwdenk 3609c609719bSwdenk 3610c1551ea8SstroeseFurther special Environment Variables: 3611c1551ea8Sstroese 3612c1551ea8Sstroese ver - Contains the U-Boot version string as printed 3613c1551ea8Sstroese with the "version" command. This variable is 3614c1551ea8Sstroese readonly (see CONFIG_VERSION_VARIABLE). 3615c1551ea8Sstroese 3616c1551ea8Sstroese 3617c609719bSwdenkPlease note that changes to some configuration parameters may take 3618c609719bSwdenkonly effect after the next boot (yes, that's just like Windoze :-). 3619c609719bSwdenk 3620c609719bSwdenk 3621f07771ccSwdenkCommand Line Parsing: 3622f07771ccSwdenk===================== 3623f07771ccSwdenk 3624f07771ccSwdenkThere are two different command line parsers available with U-Boot: 36257152b1d0Swdenkthe old "simple" one, and the much more powerful "hush" shell: 3626f07771ccSwdenk 3627f07771ccSwdenkOld, simple command line parser: 3628f07771ccSwdenk-------------------------------- 3629f07771ccSwdenk 3630f07771ccSwdenk- supports environment variables (through setenv / saveenv commands) 3631f07771ccSwdenk- several commands on one line, separated by ';' 3632fe126d8bSWolfgang Denk- variable substitution using "... ${name} ..." syntax 3633f07771ccSwdenk- special characters ('$', ';') can be escaped by prefixing with '\', 3634f07771ccSwdenk for example: 3635fe126d8bSWolfgang Denk setenv bootcmd bootm \${address} 3636f07771ccSwdenk- You can also escape text by enclosing in single apostrophes, for example: 3637f07771ccSwdenk setenv addip 'setenv bootargs $bootargs ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname::off' 3638f07771ccSwdenk 3639f07771ccSwdenkHush shell: 3640f07771ccSwdenk----------- 3641f07771ccSwdenk 3642f07771ccSwdenk- similar to Bourne shell, with control structures like 3643f07771ccSwdenk if...then...else...fi, for...do...done; while...do...done, 3644f07771ccSwdenk until...do...done, ... 3645f07771ccSwdenk- supports environment ("global") variables (through setenv / saveenv 3646f07771ccSwdenk commands) and local shell variables (through standard shell syntax 3647f07771ccSwdenk "name=value"); only environment variables can be used with "run" 3648f07771ccSwdenk command 3649f07771ccSwdenk 3650f07771ccSwdenkGeneral rules: 3651f07771ccSwdenk-------------- 3652f07771ccSwdenk 3653f07771ccSwdenk(1) If a command line (or an environment variable executed by a "run" 3654f07771ccSwdenk command) contains several commands separated by semicolon, and 3655f07771ccSwdenk one of these commands fails, then the remaining commands will be 3656f07771ccSwdenk executed anyway. 3657f07771ccSwdenk 3658f07771ccSwdenk(2) If you execute several variables with one call to run (i. e. 365911ccc33fSMarcel Ziswiler calling run with a list of variables as arguments), any failing 3660f07771ccSwdenk command will cause "run" to terminate, i. e. the remaining 3661f07771ccSwdenk variables are not executed. 3662f07771ccSwdenk 3663c609719bSwdenkNote for Redundant Ethernet Interfaces: 3664c609719bSwdenk======================================= 3665c609719bSwdenk 366611ccc33fSMarcel ZiswilerSome boards come with redundant Ethernet interfaces; U-Boot supports 3667c609719bSwdenksuch configurations and is capable of automatic selection of a 36687152b1d0Swdenk"working" interface when needed. MAC assignment works as follows: 3669c609719bSwdenk 3670c609719bSwdenkNetwork interfaces are numbered eth0, eth1, eth2, ... Corresponding 3671c609719bSwdenkMAC addresses can be stored in the environment as "ethaddr" (=>eth0), 3672c609719bSwdenk"eth1addr" (=>eth1), "eth2addr", ... 3673c609719bSwdenk 3674c609719bSwdenkIf the network interface stores some valid MAC address (for instance 3675c609719bSwdenkin SROM), this is used as default address if there is NO correspon- 3676c609719bSwdenkding setting in the environment; if the corresponding environment 3677c609719bSwdenkvariable is set, this overrides the settings in the card; that means: 3678c609719bSwdenk 3679c609719bSwdenko If the SROM has a valid MAC address, and there is no address in the 3680c609719bSwdenk environment, the SROM's address is used. 3681c609719bSwdenk 3682c609719bSwdenko If there is no valid address in the SROM, and a definition in the 3683c609719bSwdenk environment exists, then the value from the environment variable is 3684c609719bSwdenk used. 3685c609719bSwdenk 3686c609719bSwdenko If both the SROM and the environment contain a MAC address, and 3687c609719bSwdenk both addresses are the same, this MAC address is used. 3688c609719bSwdenk 3689c609719bSwdenko If both the SROM and the environment contain a MAC address, and the 3690c609719bSwdenk addresses differ, the value from the environment is used and a 3691c609719bSwdenk warning is printed. 3692c609719bSwdenk 3693c609719bSwdenko If neither SROM nor the environment contain a MAC address, an error 3694c609719bSwdenk is raised. 3695c609719bSwdenk 3696ecee9324SBen WarrenIf Ethernet drivers implement the 'write_hwaddr' function, valid MAC addresses 3697ecee9324SBen Warrenwill be programmed into hardware as part of the initialization process. This 3698ecee9324SBen Warrenmay be skipped by setting the appropriate 'ethmacskip' environment variable. 3699ecee9324SBen WarrenThe naming convention is as follows: 3700ecee9324SBen Warren"ethmacskip" (=>eth0), "eth1macskip" (=>eth1) etc. 3701c609719bSwdenk 3702c609719bSwdenkImage Formats: 3703c609719bSwdenk============== 3704c609719bSwdenk 37053310c549SMarian BalakowiczU-Boot is capable of booting (and performing other auxiliary operations on) 37063310c549SMarian Balakowiczimages in two formats: 37073310c549SMarian Balakowicz 37083310c549SMarian BalakowiczNew uImage format (FIT) 37093310c549SMarian Balakowicz----------------------- 37103310c549SMarian Balakowicz 37113310c549SMarian BalakowiczFlexible and powerful format based on Flattened Image Tree -- FIT (similar 37123310c549SMarian Balakowiczto Flattened Device Tree). It allows the use of images with multiple 37133310c549SMarian Balakowiczcomponents (several kernels, ramdisks, etc.), with contents protected by 37143310c549SMarian BalakowiczSHA1, MD5 or CRC32. More details are found in the doc/uImage.FIT directory. 37153310c549SMarian Balakowicz 37163310c549SMarian Balakowicz 37173310c549SMarian BalakowiczOld uImage format 37183310c549SMarian Balakowicz----------------- 37193310c549SMarian Balakowicz 37203310c549SMarian BalakowiczOld image format is based on binary files which can be basically anything, 37213310c549SMarian Balakowiczpreceded by a special header; see the definitions in include/image.h for 37223310c549SMarian Balakowiczdetails; basically, the header defines the following image properties: 3723c609719bSwdenk 3724c609719bSwdenk* Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD, 3725c609719bSwdenk 4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks, 3726f5ed9e39SPeter Tyser LynxOS, pSOS, QNX, RTEMS, INTEGRITY; 3727f5ed9e39SPeter Tyser Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, LynxOS, 3728f5ed9e39SPeter Tyser INTEGRITY). 37297b64fef3SWolfgang Denk* Target CPU Architecture (Provisions for Alpha, ARM, AVR32, Intel x86, 3730*afc1ce82SMacpaul Lin IA64, MIPS, NDS32, Nios II, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit; 3731*afc1ce82SMacpaul Lin Currently supported: ARM, AVR32, Intel x86, MIPS, NDS32, Nios II, PowerPC). 3732c29fdfc1Swdenk* Compression Type (uncompressed, gzip, bzip2) 3733c609719bSwdenk* Load Address 3734c609719bSwdenk* Entry Point 3735c609719bSwdenk* Image Name 3736c609719bSwdenk* Image Timestamp 3737c609719bSwdenk 3738c609719bSwdenkThe header is marked by a special Magic Number, and both the header 3739c609719bSwdenkand the data portions of the image are secured against corruption by 3740c609719bSwdenkCRC32 checksums. 3741c609719bSwdenk 3742c609719bSwdenk 3743c609719bSwdenkLinux Support: 3744c609719bSwdenk============== 3745c609719bSwdenk 3746c609719bSwdenkAlthough U-Boot should support any OS or standalone application 37477152b1d0Swdenkeasily, the main focus has always been on Linux during the design of 3748c609719bSwdenkU-Boot. 3749c609719bSwdenk 3750c609719bSwdenkU-Boot includes many features that so far have been part of some 3751c609719bSwdenkspecial "boot loader" code within the Linux kernel. Also, any 3752c609719bSwdenk"initrd" images to be used are no longer part of one big Linux image; 3753c609719bSwdenkinstead, kernel and "initrd" are separate images. This implementation 37547152b1d0Swdenkserves several purposes: 3755c609719bSwdenk 3756c609719bSwdenk- the same features can be used for other OS or standalone 3757c609719bSwdenk applications (for instance: using compressed images to reduce the 3758c609719bSwdenk Flash memory footprint) 3759c609719bSwdenk 3760c609719bSwdenk- it becomes much easier to port new Linux kernel versions because 37617152b1d0Swdenk lots of low-level, hardware dependent stuff are done by U-Boot 3762c609719bSwdenk 3763c609719bSwdenk- the same Linux kernel image can now be used with different "initrd" 3764c609719bSwdenk images; of course this also means that different kernel images can 3765c609719bSwdenk be run with the same "initrd". This makes testing easier (you don't 3766c609719bSwdenk have to build a new "zImage.initrd" Linux image when you just 3767c609719bSwdenk change a file in your "initrd"). Also, a field-upgrade of the 3768c609719bSwdenk software is easier now. 3769c609719bSwdenk 3770c609719bSwdenk 3771c609719bSwdenkLinux HOWTO: 3772c609719bSwdenk============ 3773c609719bSwdenk 3774c609719bSwdenkPorting Linux to U-Boot based systems: 3775c609719bSwdenk--------------------------------------- 3776c609719bSwdenk 3777c609719bSwdenkU-Boot cannot save you from doing all the necessary modifications to 3778c609719bSwdenkconfigure the Linux device drivers for use with your target hardware 3779c609719bSwdenk(no, we don't intend to provide a full virtual machine interface to 3780c609719bSwdenkLinux :-). 3781c609719bSwdenk 3782a47a12beSStefan RoeseBut now you can ignore ALL boot loader code (in arch/powerpc/mbxboot). 3783c609719bSwdenk 3784c609719bSwdenkJust make sure your machine specific header file (for instance 3785c609719bSwdenkinclude/asm-ppc/tqm8xx.h) includes the same definition of the Board 37861dc30693SMarkus HeidelbergInformation structure as we define in include/asm-<arch>/u-boot.h, 37871dc30693SMarkus Heidelbergand make sure that your definition of IMAP_ADDR uses the same value 37886d0f6bcfSJean-Christophe PLAGNIOL-VILLARDas your U-Boot configuration in CONFIG_SYS_IMMR. 3789c609719bSwdenk 3790c609719bSwdenk 3791c609719bSwdenkConfiguring the Linux kernel: 3792c609719bSwdenk----------------------------- 3793c609719bSwdenk 3794c609719bSwdenkNo specific requirements for U-Boot. Make sure you have some root 3795c609719bSwdenkdevice (initial ramdisk, NFS) for your target system. 3796c609719bSwdenk 3797c609719bSwdenk 3798c609719bSwdenkBuilding a Linux Image: 3799c609719bSwdenk----------------------- 3800c609719bSwdenk 380124ee89b9SwdenkWith U-Boot, "normal" build targets like "zImage" or "bzImage" are 380224ee89b9Swdenknot used. If you use recent kernel source, a new build target 380324ee89b9Swdenk"uImage" will exist which automatically builds an image usable by 380424ee89b9SwdenkU-Boot. Most older kernels also have support for a "pImage" target, 380524ee89b9Swdenkwhich was introduced for our predecessor project PPCBoot and uses a 380624ee89b9Swdenk100% compatible format. 3807c609719bSwdenk 3808c609719bSwdenkExample: 3809c609719bSwdenk 3810c609719bSwdenk make TQM850L_config 3811c609719bSwdenk make oldconfig 3812c609719bSwdenk make dep 381324ee89b9Swdenk make uImage 3814c609719bSwdenk 381524ee89b9SwdenkThe "uImage" build target uses a special tool (in 'tools/mkimage') to 381624ee89b9Swdenkencapsulate a compressed Linux kernel image with header information, 381724ee89b9SwdenkCRC32 checksum etc. for use with U-Boot. This is what we are doing: 3818c609719bSwdenk 381924ee89b9Swdenk* build a standard "vmlinux" kernel image (in ELF binary format): 382024ee89b9Swdenk 382124ee89b9Swdenk* convert the kernel into a raw binary image: 382224ee89b9Swdenk 382324ee89b9Swdenk ${CROSS_COMPILE}-objcopy -O binary \ 382424ee89b9Swdenk -R .note -R .comment \ 382524ee89b9Swdenk -S vmlinux linux.bin 382624ee89b9Swdenk 382724ee89b9Swdenk* compress the binary image: 382824ee89b9Swdenk 382924ee89b9Swdenk gzip -9 linux.bin 383024ee89b9Swdenk 383124ee89b9Swdenk* package compressed binary image for U-Boot: 383224ee89b9Swdenk 383324ee89b9Swdenk mkimage -A ppc -O linux -T kernel -C gzip \ 383424ee89b9Swdenk -a 0 -e 0 -n "Linux Kernel Image" \ 383524ee89b9Swdenk -d linux.bin.gz uImage 383624ee89b9Swdenk 383724ee89b9Swdenk 383824ee89b9SwdenkThe "mkimage" tool can also be used to create ramdisk images for use 383924ee89b9Swdenkwith U-Boot, either separated from the Linux kernel image, or 384024ee89b9Swdenkcombined into one file. "mkimage" encapsulates the images with a 64 384124ee89b9Swdenkbyte header containing information about target architecture, 384224ee89b9Swdenkoperating system, image type, compression method, entry points, time 384324ee89b9Swdenkstamp, CRC32 checksums, etc. 384424ee89b9Swdenk 384524ee89b9Swdenk"mkimage" can be called in two ways: to verify existing images and 384624ee89b9Swdenkprint the header information, or to build new images. 3847c609719bSwdenk 3848c609719bSwdenkIn the first form (with "-l" option) mkimage lists the information 3849c609719bSwdenkcontained in the header of an existing U-Boot image; this includes 3850c609719bSwdenkchecksum verification: 3851c609719bSwdenk 3852c609719bSwdenk tools/mkimage -l image 3853c609719bSwdenk -l ==> list image header information 3854c609719bSwdenk 3855c609719bSwdenkThe second form (with "-d" option) is used to build a U-Boot image 3856c609719bSwdenkfrom a "data file" which is used as image payload: 3857c609719bSwdenk 3858c609719bSwdenk tools/mkimage -A arch -O os -T type -C comp -a addr -e ep \ 3859c609719bSwdenk -n name -d data_file image 3860c609719bSwdenk -A ==> set architecture to 'arch' 3861c609719bSwdenk -O ==> set operating system to 'os' 3862c609719bSwdenk -T ==> set image type to 'type' 3863c609719bSwdenk -C ==> set compression type 'comp' 3864c609719bSwdenk -a ==> set load address to 'addr' (hex) 3865c609719bSwdenk -e ==> set entry point to 'ep' (hex) 3866c609719bSwdenk -n ==> set image name to 'name' 3867c609719bSwdenk -d ==> use image data from 'datafile' 3868c609719bSwdenk 386969459791SwdenkRight now, all Linux kernels for PowerPC systems use the same load 387069459791Swdenkaddress (0x00000000), but the entry point address depends on the 387169459791Swdenkkernel version: 3872c609719bSwdenk 3873c609719bSwdenk- 2.2.x kernels have the entry point at 0x0000000C, 387424ee89b9Swdenk- 2.3.x and later kernels have the entry point at 0x00000000. 3875c609719bSwdenk 3876c609719bSwdenkSo a typical call to build a U-Boot image would read: 3877c609719bSwdenk 387824ee89b9Swdenk -> tools/mkimage -n '2.4.4 kernel for TQM850L' \ 387924ee89b9Swdenk > -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \ 3880a47a12beSStefan Roese > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz \ 388124ee89b9Swdenk > examples/uImage.TQM850L 388224ee89b9Swdenk Image Name: 2.4.4 kernel for TQM850L 3883c609719bSwdenk Created: Wed Jul 19 02:34:59 2000 3884c609719bSwdenk Image Type: PowerPC Linux Kernel Image (gzip compressed) 3885c609719bSwdenk Data Size: 335725 Bytes = 327.86 kB = 0.32 MB 3886c609719bSwdenk Load Address: 0x00000000 388724ee89b9Swdenk Entry Point: 0x00000000 3888c609719bSwdenk 3889c609719bSwdenkTo verify the contents of the image (or check for corruption): 3890c609719bSwdenk 389124ee89b9Swdenk -> tools/mkimage -l examples/uImage.TQM850L 389224ee89b9Swdenk Image Name: 2.4.4 kernel for TQM850L 3893c609719bSwdenk Created: Wed Jul 19 02:34:59 2000 3894c609719bSwdenk Image Type: PowerPC Linux Kernel Image (gzip compressed) 3895c609719bSwdenk Data Size: 335725 Bytes = 327.86 kB = 0.32 MB 3896c609719bSwdenk Load Address: 0x00000000 389724ee89b9Swdenk Entry Point: 0x00000000 3898c609719bSwdenk 3899c609719bSwdenkNOTE: for embedded systems where boot time is critical you can trade 3900c609719bSwdenkspeed for memory and install an UNCOMPRESSED image instead: this 3901c609719bSwdenkneeds more space in Flash, but boots much faster since it does not 3902c609719bSwdenkneed to be uncompressed: 3903c609719bSwdenk 3904a47a12beSStefan Roese -> gunzip /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz 390524ee89b9Swdenk -> tools/mkimage -n '2.4.4 kernel for TQM850L' \ 390624ee89b9Swdenk > -A ppc -O linux -T kernel -C none -a 0 -e 0 \ 3907a47a12beSStefan Roese > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux \ 390824ee89b9Swdenk > examples/uImage.TQM850L-uncompressed 390924ee89b9Swdenk Image Name: 2.4.4 kernel for TQM850L 3910c609719bSwdenk Created: Wed Jul 19 02:34:59 2000 3911c609719bSwdenk Image Type: PowerPC Linux Kernel Image (uncompressed) 3912c609719bSwdenk Data Size: 792160 Bytes = 773.59 kB = 0.76 MB 3913c609719bSwdenk Load Address: 0x00000000 391424ee89b9Swdenk Entry Point: 0x00000000 3915c609719bSwdenk 3916c609719bSwdenk 3917c609719bSwdenkSimilar you can build U-Boot images from a 'ramdisk.image.gz' file 3918c609719bSwdenkwhen your kernel is intended to use an initial ramdisk: 3919c609719bSwdenk 3920c609719bSwdenk -> tools/mkimage -n 'Simple Ramdisk Image' \ 3921c609719bSwdenk > -A ppc -O linux -T ramdisk -C gzip \ 3922c609719bSwdenk > -d /LinuxPPC/images/SIMPLE-ramdisk.image.gz examples/simple-initrd 3923c609719bSwdenk Image Name: Simple Ramdisk Image 3924c609719bSwdenk Created: Wed Jan 12 14:01:50 2000 3925c609719bSwdenk Image Type: PowerPC Linux RAMDisk Image (gzip compressed) 3926c609719bSwdenk Data Size: 566530 Bytes = 553.25 kB = 0.54 MB 3927c609719bSwdenk Load Address: 0x00000000 3928c609719bSwdenk Entry Point: 0x00000000 3929c609719bSwdenk 3930c609719bSwdenk 3931c609719bSwdenkInstalling a Linux Image: 3932c609719bSwdenk------------------------- 3933c609719bSwdenk 3934c609719bSwdenkTo downloading a U-Boot image over the serial (console) interface, 3935c609719bSwdenkyou must convert the image to S-Record format: 3936c609719bSwdenk 3937c609719bSwdenk objcopy -I binary -O srec examples/image examples/image.srec 3938c609719bSwdenk 3939c609719bSwdenkThe 'objcopy' does not understand the information in the U-Boot 3940c609719bSwdenkimage header, so the resulting S-Record file will be relative to 3941c609719bSwdenkaddress 0x00000000. To load it to a given address, you need to 3942c609719bSwdenkspecify the target address as 'offset' parameter with the 'loads' 3943c609719bSwdenkcommand. 3944c609719bSwdenk 3945c609719bSwdenkExample: install the image to address 0x40100000 (which on the 3946c609719bSwdenkTQM8xxL is in the first Flash bank): 3947c609719bSwdenk 3948c609719bSwdenk => erase 40100000 401FFFFF 3949c609719bSwdenk 3950c609719bSwdenk .......... done 3951c609719bSwdenk Erased 8 sectors 3952c609719bSwdenk 3953c609719bSwdenk => loads 40100000 3954c609719bSwdenk ## Ready for S-Record download ... 3955c609719bSwdenk ~>examples/image.srec 3956c609719bSwdenk 1 2 3 4 5 6 7 8 9 10 11 12 13 ... 3957c609719bSwdenk ... 3958c609719bSwdenk 15989 15990 15991 15992 3959c609719bSwdenk [file transfer complete] 3960c609719bSwdenk [connected] 3961c609719bSwdenk ## Start Addr = 0x00000000 3962c609719bSwdenk 3963c609719bSwdenk 3964c609719bSwdenkYou can check the success of the download using the 'iminfo' command; 3965c609719bSwdenkthis includes a checksum verification so you can be sure no data 3966c609719bSwdenkcorruption happened: 3967c609719bSwdenk 3968c609719bSwdenk => imi 40100000 3969c609719bSwdenk 3970c609719bSwdenk ## Checking Image at 40100000 ... 3971c609719bSwdenk Image Name: 2.2.13 for initrd on TQM850L 3972c609719bSwdenk Image Type: PowerPC Linux Kernel Image (gzip compressed) 3973c609719bSwdenk Data Size: 335725 Bytes = 327 kB = 0 MB 3974c609719bSwdenk Load Address: 00000000 3975c609719bSwdenk Entry Point: 0000000c 3976c609719bSwdenk Verifying Checksum ... OK 3977c609719bSwdenk 3978c609719bSwdenk 3979c609719bSwdenkBoot Linux: 3980c609719bSwdenk----------- 3981c609719bSwdenk 3982c609719bSwdenkThe "bootm" command is used to boot an application that is stored in 3983c609719bSwdenkmemory (RAM or Flash). In case of a Linux kernel image, the contents 3984c609719bSwdenkof the "bootargs" environment variable is passed to the kernel as 3985c609719bSwdenkparameters. You can check and modify this variable using the 3986c609719bSwdenk"printenv" and "setenv" commands: 3987c609719bSwdenk 3988c609719bSwdenk 3989c609719bSwdenk => printenv bootargs 3990c609719bSwdenk bootargs=root=/dev/ram 3991c609719bSwdenk 3992c609719bSwdenk => setenv bootargs root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2 3993c609719bSwdenk 3994c609719bSwdenk => printenv bootargs 3995c609719bSwdenk bootargs=root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2 3996c609719bSwdenk 3997c609719bSwdenk => bootm 40020000 3998c609719bSwdenk ## Booting Linux kernel at 40020000 ... 3999c609719bSwdenk Image Name: 2.2.13 for NFS on TQM850L 4000c609719bSwdenk Image Type: PowerPC Linux Kernel Image (gzip compressed) 4001c609719bSwdenk Data Size: 381681 Bytes = 372 kB = 0 MB 4002c609719bSwdenk Load Address: 00000000 4003c609719bSwdenk Entry Point: 0000000c 4004c609719bSwdenk Verifying Checksum ... OK 4005c609719bSwdenk Uncompressing Kernel Image ... OK 4006c609719bSwdenk 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 4007c609719bSwdenk Boot arguments: root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2 4008c609719bSwdenk time_init: decrementer frequency = 187500000/60 4009c609719bSwdenk Calibrating delay loop... 49.77 BogoMIPS 4010c609719bSwdenk Memory: 15208k available (700k kernel code, 444k data, 32k init) [c0000000,c1000000] 4011c609719bSwdenk ... 4012c609719bSwdenk 401311ccc33fSMarcel ZiswilerIf you want to boot a Linux kernel with initial RAM disk, you pass 40147152b1d0Swdenkthe memory addresses of both the kernel and the initrd image (PPBCOOT 4015c609719bSwdenkformat!) to the "bootm" command: 4016c609719bSwdenk 4017c609719bSwdenk => imi 40100000 40200000 4018c609719bSwdenk 4019c609719bSwdenk ## Checking Image at 40100000 ... 4020c609719bSwdenk Image Name: 2.2.13 for initrd on TQM850L 4021c609719bSwdenk Image Type: PowerPC Linux Kernel Image (gzip compressed) 4022c609719bSwdenk Data Size: 335725 Bytes = 327 kB = 0 MB 4023c609719bSwdenk Load Address: 00000000 4024c609719bSwdenk Entry Point: 0000000c 4025c609719bSwdenk Verifying Checksum ... OK 4026c609719bSwdenk 4027c609719bSwdenk ## Checking Image at 40200000 ... 4028c609719bSwdenk Image Name: Simple Ramdisk Image 4029c609719bSwdenk Image Type: PowerPC Linux RAMDisk Image (gzip compressed) 4030c609719bSwdenk Data Size: 566530 Bytes = 553 kB = 0 MB 4031c609719bSwdenk Load Address: 00000000 4032c609719bSwdenk Entry Point: 00000000 4033c609719bSwdenk Verifying Checksum ... OK 4034c609719bSwdenk 4035c609719bSwdenk => bootm 40100000 40200000 4036c609719bSwdenk ## Booting Linux kernel at 40100000 ... 4037c609719bSwdenk Image Name: 2.2.13 for initrd on TQM850L 4038c609719bSwdenk Image Type: PowerPC Linux Kernel Image (gzip compressed) 4039c609719bSwdenk Data Size: 335725 Bytes = 327 kB = 0 MB 4040c609719bSwdenk Load Address: 00000000 4041c609719bSwdenk Entry Point: 0000000c 4042c609719bSwdenk Verifying Checksum ... OK 4043c609719bSwdenk Uncompressing Kernel Image ... OK 4044c609719bSwdenk ## Loading RAMDisk Image at 40200000 ... 4045c609719bSwdenk Image Name: Simple Ramdisk Image 4046c609719bSwdenk Image Type: PowerPC Linux RAMDisk Image (gzip compressed) 4047c609719bSwdenk Data Size: 566530 Bytes = 553 kB = 0 MB 4048c609719bSwdenk Load Address: 00000000 4049c609719bSwdenk Entry Point: 00000000 4050c609719bSwdenk Verifying Checksum ... OK 4051c609719bSwdenk Loading Ramdisk ... OK 4052c609719bSwdenk 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 4053c609719bSwdenk Boot arguments: root=/dev/ram 4054c609719bSwdenk time_init: decrementer frequency = 187500000/60 4055c609719bSwdenk Calibrating delay loop... 49.77 BogoMIPS 4056c609719bSwdenk ... 4057c609719bSwdenk RAMDISK: Compressed image found at block 0 4058c609719bSwdenk VFS: Mounted root (ext2 filesystem). 4059c609719bSwdenk 4060c609719bSwdenk bash# 4061c609719bSwdenk 40620267768eSMatthew McClintockBoot Linux and pass a flat device tree: 40630267768eSMatthew McClintock----------- 40640267768eSMatthew McClintock 40650267768eSMatthew McClintockFirst, U-Boot must be compiled with the appropriate defines. See the section 40660267768eSMatthew McClintocktitled "Linux Kernel Interface" above for a more in depth explanation. The 40670267768eSMatthew McClintockfollowing is an example of how to start a kernel and pass an updated 40680267768eSMatthew McClintockflat device tree: 40690267768eSMatthew McClintock 40700267768eSMatthew McClintock=> print oftaddr 40710267768eSMatthew McClintockoftaddr=0x300000 40720267768eSMatthew McClintock=> print oft 40730267768eSMatthew McClintockoft=oftrees/mpc8540ads.dtb 40740267768eSMatthew McClintock=> tftp $oftaddr $oft 40750267768eSMatthew McClintockSpeed: 1000, full duplex 40760267768eSMatthew McClintockUsing TSEC0 device 40770267768eSMatthew McClintockTFTP from server 192.168.1.1; our IP address is 192.168.1.101 40780267768eSMatthew McClintockFilename 'oftrees/mpc8540ads.dtb'. 40790267768eSMatthew McClintockLoad address: 0x300000 40800267768eSMatthew McClintockLoading: # 40810267768eSMatthew McClintockdone 40820267768eSMatthew McClintockBytes transferred = 4106 (100a hex) 40830267768eSMatthew McClintock=> tftp $loadaddr $bootfile 40840267768eSMatthew McClintockSpeed: 1000, full duplex 40850267768eSMatthew McClintockUsing TSEC0 device 40860267768eSMatthew McClintockTFTP from server 192.168.1.1; our IP address is 192.168.1.2 40870267768eSMatthew McClintockFilename 'uImage'. 40880267768eSMatthew McClintockLoad address: 0x200000 40890267768eSMatthew McClintockLoading:############ 40900267768eSMatthew McClintockdone 40910267768eSMatthew McClintockBytes transferred = 1029407 (fb51f hex) 40920267768eSMatthew McClintock=> print loadaddr 40930267768eSMatthew McClintockloadaddr=200000 40940267768eSMatthew McClintock=> print oftaddr 40950267768eSMatthew McClintockoftaddr=0x300000 40960267768eSMatthew McClintock=> bootm $loadaddr - $oftaddr 40970267768eSMatthew McClintock## Booting image at 00200000 ... 40980267768eSMatthew McClintock Image Name: Linux-2.6.17-dirty 40990267768eSMatthew McClintock Image Type: PowerPC Linux Kernel Image (gzip compressed) 41000267768eSMatthew McClintock Data Size: 1029343 Bytes = 1005.2 kB 41010267768eSMatthew McClintock Load Address: 00000000 41020267768eSMatthew McClintock Entry Point: 00000000 41030267768eSMatthew McClintock Verifying Checksum ... OK 41040267768eSMatthew McClintock Uncompressing Kernel Image ... OK 41050267768eSMatthew McClintockBooting using flat device tree at 0x300000 41060267768eSMatthew McClintockUsing MPC85xx ADS machine description 41070267768eSMatthew McClintockMemory CAM mapping: CAM0=256Mb, CAM1=256Mb, CAM2=0Mb residual: 0Mb 41080267768eSMatthew McClintock[snip] 41090267768eSMatthew McClintock 41100267768eSMatthew McClintock 41116069ff26SwdenkMore About U-Boot Image Types: 41126069ff26Swdenk------------------------------ 41136069ff26Swdenk 41146069ff26SwdenkU-Boot supports the following image types: 41156069ff26Swdenk 41166069ff26Swdenk "Standalone Programs" are directly runnable in the environment 41176069ff26Swdenk provided by U-Boot; it is expected that (if they behave 41186069ff26Swdenk well) you can continue to work in U-Boot after return from 41196069ff26Swdenk the Standalone Program. 41206069ff26Swdenk "OS Kernel Images" are usually images of some Embedded OS which 41216069ff26Swdenk will take over control completely. Usually these programs 41226069ff26Swdenk will install their own set of exception handlers, device 41236069ff26Swdenk drivers, set up the MMU, etc. - this means, that you cannot 41246069ff26Swdenk expect to re-enter U-Boot except by resetting the CPU. 41256069ff26Swdenk "RAMDisk Images" are more or less just data blocks, and their 41266069ff26Swdenk parameters (address, size) are passed to an OS kernel that is 41276069ff26Swdenk being started. 41286069ff26Swdenk "Multi-File Images" contain several images, typically an OS 41296069ff26Swdenk (Linux) kernel image and one or more data images like 41306069ff26Swdenk RAMDisks. This construct is useful for instance when you want 41316069ff26Swdenk to boot over the network using BOOTP etc., where the boot 41326069ff26Swdenk server provides just a single image file, but you want to get 41336069ff26Swdenk for instance an OS kernel and a RAMDisk image. 41346069ff26Swdenk 41356069ff26Swdenk "Multi-File Images" start with a list of image sizes, each 41366069ff26Swdenk image size (in bytes) specified by an "uint32_t" in network 41376069ff26Swdenk byte order. This list is terminated by an "(uint32_t)0". 41386069ff26Swdenk Immediately after the terminating 0 follow the images, one by 41396069ff26Swdenk one, all aligned on "uint32_t" boundaries (size rounded up to 41406069ff26Swdenk a multiple of 4 bytes). 41416069ff26Swdenk 41426069ff26Swdenk "Firmware Images" are binary images containing firmware (like 41436069ff26Swdenk U-Boot or FPGA images) which usually will be programmed to 41446069ff26Swdenk flash memory. 41456069ff26Swdenk 41466069ff26Swdenk "Script files" are command sequences that will be executed by 41476069ff26Swdenk U-Boot's command interpreter; this feature is especially 41486069ff26Swdenk useful when you configure U-Boot to use a real shell (hush) 41496069ff26Swdenk as command interpreter. 41506069ff26Swdenk 4151c609719bSwdenk 4152c609719bSwdenkStandalone HOWTO: 4153c609719bSwdenk================= 4154c609719bSwdenk 4155c609719bSwdenkOne of the features of U-Boot is that you can dynamically load and 4156c609719bSwdenkrun "standalone" applications, which can use some resources of 4157c609719bSwdenkU-Boot like console I/O functions or interrupt services. 4158c609719bSwdenk 4159c609719bSwdenkTwo simple examples are included with the sources: 4160c609719bSwdenk 4161c609719bSwdenk"Hello World" Demo: 4162c609719bSwdenk------------------- 4163c609719bSwdenk 4164c609719bSwdenk'examples/hello_world.c' contains a small "Hello World" Demo 4165c609719bSwdenkapplication; it is automatically compiled when you build U-Boot. 4166c609719bSwdenkIt's configured to run at address 0x00040004, so you can play with it 4167c609719bSwdenklike that: 4168c609719bSwdenk 4169c609719bSwdenk => loads 4170c609719bSwdenk ## Ready for S-Record download ... 4171c609719bSwdenk ~>examples/hello_world.srec 4172c609719bSwdenk 1 2 3 4 5 6 7 8 9 10 11 ... 4173c609719bSwdenk [file transfer complete] 4174c609719bSwdenk [connected] 4175c609719bSwdenk ## Start Addr = 0x00040004 4176c609719bSwdenk 4177c609719bSwdenk => go 40004 Hello World! This is a test. 4178c609719bSwdenk ## Starting application at 0x00040004 ... 4179c609719bSwdenk Hello World 4180c609719bSwdenk argc = 7 4181c609719bSwdenk argv[0] = "40004" 4182c609719bSwdenk argv[1] = "Hello" 4183c609719bSwdenk argv[2] = "World!" 4184c609719bSwdenk argv[3] = "This" 4185c609719bSwdenk argv[4] = "is" 4186c609719bSwdenk argv[5] = "a" 4187c609719bSwdenk argv[6] = "test." 4188c609719bSwdenk argv[7] = "<NULL>" 4189c609719bSwdenk Hit any key to exit ... 4190c609719bSwdenk 4191c609719bSwdenk ## Application terminated, rc = 0x0 4192c609719bSwdenk 4193c609719bSwdenkAnother example, which demonstrates how to register a CPM interrupt 4194c609719bSwdenkhandler with the U-Boot code, can be found in 'examples/timer.c'. 4195c609719bSwdenkHere, a CPM timer is set up to generate an interrupt every second. 4196c609719bSwdenkThe interrupt service routine is trivial, just printing a '.' 4197c609719bSwdenkcharacter, but this is just a demo program. The application can be 4198c609719bSwdenkcontrolled by the following keys: 4199c609719bSwdenk 4200c609719bSwdenk ? - print current values og the CPM Timer registers 4201c609719bSwdenk b - enable interrupts and start timer 4202c609719bSwdenk e - stop timer and disable interrupts 4203c609719bSwdenk q - quit application 4204c609719bSwdenk 4205c609719bSwdenk => loads 4206c609719bSwdenk ## Ready for S-Record download ... 4207c609719bSwdenk ~>examples/timer.srec 4208c609719bSwdenk 1 2 3 4 5 6 7 8 9 10 11 ... 4209c609719bSwdenk [file transfer complete] 4210c609719bSwdenk [connected] 4211c609719bSwdenk ## Start Addr = 0x00040004 4212c609719bSwdenk 4213c609719bSwdenk => go 40004 4214c609719bSwdenk ## Starting application at 0x00040004 ... 4215c609719bSwdenk TIMERS=0xfff00980 4216c609719bSwdenk Using timer 1 4217c609719bSwdenk tgcr @ 0xfff00980, tmr @ 0xfff00990, trr @ 0xfff00994, tcr @ 0xfff00998, tcn @ 0xfff0099c, ter @ 0xfff009b0 4218c609719bSwdenk 4219c609719bSwdenkHit 'b': 4220c609719bSwdenk [q, b, e, ?] Set interval 1000000 us 4221c609719bSwdenk Enabling timer 4222c609719bSwdenkHit '?': 4223c609719bSwdenk [q, b, e, ?] ........ 4224c609719bSwdenk tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0xef6, ter=0x0 4225c609719bSwdenkHit '?': 4226c609719bSwdenk [q, b, e, ?] . 4227c609719bSwdenk tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x2ad4, ter=0x0 4228c609719bSwdenkHit '?': 4229c609719bSwdenk [q, b, e, ?] . 4230c609719bSwdenk tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x1efc, ter=0x0 4231c609719bSwdenkHit '?': 4232c609719bSwdenk [q, b, e, ?] . 4233c609719bSwdenk tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x169d, ter=0x0 4234c609719bSwdenkHit 'e': 4235c609719bSwdenk [q, b, e, ?] ...Stopping timer 4236c609719bSwdenkHit 'q': 4237c609719bSwdenk [q, b, e, ?] ## Application terminated, rc = 0x0 4238c609719bSwdenk 4239c609719bSwdenk 424085ec0bccSwdenkMinicom warning: 424185ec0bccSwdenk================ 424285ec0bccSwdenk 42437152b1d0SwdenkOver time, many people have reported problems when trying to use the 424485ec0bccSwdenk"minicom" terminal emulation program for serial download. I (wd) 424585ec0bccSwdenkconsider minicom to be broken, and recommend not to use it. Under 4246f07771ccSwdenkUnix, I recommend to use C-Kermit for general purpose use (and 424785ec0bccSwdenkespecially for kermit binary protocol download ("loadb" command), and 424885ec0bccSwdenkuse "cu" for S-Record download ("loads" command). 424985ec0bccSwdenk 425052f52c14SwdenkNevertheless, if you absolutely want to use it try adding this 425152f52c14Swdenkconfiguration to your "File transfer protocols" section: 425252f52c14Swdenk 425352f52c14Swdenk Name Program Name U/D FullScr IO-Red. Multi 425452f52c14Swdenk X kermit /usr/bin/kermit -i -l %l -s Y U Y N N 425552f52c14Swdenk Y kermit /usr/bin/kermit -i -l %l -r N D Y N N 425652f52c14Swdenk 425752f52c14Swdenk 4258c609719bSwdenkNetBSD Notes: 4259c609719bSwdenk============= 4260c609719bSwdenk 4261c609719bSwdenkStarting at version 0.9.2, U-Boot supports NetBSD both as host 4262c609719bSwdenk(build U-Boot) and target system (boots NetBSD/mpc8xx). 4263c609719bSwdenk 4264c609719bSwdenkBuilding requires a cross environment; it is known to work on 4265c609719bSwdenkNetBSD/i386 with the cross-powerpc-netbsd-1.3 package (you will also 4266c609719bSwdenkneed gmake since the Makefiles are not compatible with BSD make). 4267c609719bSwdenkNote that the cross-powerpc package does not install include files; 4268c609719bSwdenkattempting to build U-Boot will fail because <machine/ansi.h> is 4269c609719bSwdenkmissing. This file has to be installed and patched manually: 4270c609719bSwdenk 4271c609719bSwdenk # cd /usr/pkg/cross/powerpc-netbsd/include 4272c609719bSwdenk # mkdir powerpc 4273c609719bSwdenk # ln -s powerpc machine 4274c609719bSwdenk # cp /usr/src/sys/arch/powerpc/include/ansi.h powerpc/ansi.h 4275c609719bSwdenk # ${EDIT} powerpc/ansi.h ## must remove __va_list, _BSD_VA_LIST 4276c609719bSwdenk 4277c609719bSwdenkNative builds *don't* work due to incompatibilities between native 4278c609719bSwdenkand U-Boot include files. 4279c609719bSwdenk 4280c609719bSwdenkBooting assumes that (the first part of) the image booted is a 4281c609719bSwdenkstage-2 loader which in turn loads and then invokes the kernel 4282c609719bSwdenkproper. Loader sources will eventually appear in the NetBSD source 4283c609719bSwdenktree (probably in sys/arc/mpc8xx/stand/u-boot_stage2/); in the 42842a8af187Swdenkmeantime, see ftp://ftp.denx.de/pub/u-boot/ppcboot_stage2.tar.gz 4285c609719bSwdenk 4286c609719bSwdenk 4287c609719bSwdenkImplementation Internals: 4288c609719bSwdenk========================= 4289c609719bSwdenk 4290c609719bSwdenkThe following is not intended to be a complete description of every 4291c609719bSwdenkimplementation detail. However, it should help to understand the 4292c609719bSwdenkinner workings of U-Boot and make it easier to port it to custom 4293c609719bSwdenkhardware. 4294c609719bSwdenk 4295c609719bSwdenk 4296c609719bSwdenkInitial Stack, Global Data: 4297c609719bSwdenk--------------------------- 4298c609719bSwdenk 4299c609719bSwdenkThe implementation of U-Boot is complicated by the fact that U-Boot 4300c609719bSwdenkstarts running out of ROM (flash memory), usually without access to 4301c609719bSwdenksystem RAM (because the memory controller is not initialized yet). 4302c609719bSwdenkThis means that we don't have writable Data or BSS segments, and BSS 4303c609719bSwdenkis not initialized as zero. To be able to get a C environment working 4304c609719bSwdenkat all, we have to allocate at least a minimal stack. Implementation 4305c609719bSwdenkoptions for this are defined and restricted by the CPU used: Some CPU 4306c609719bSwdenkmodels provide on-chip memory (like the IMMR area on MPC8xx and 4307c609719bSwdenkMPC826x processors), on others (parts of) the data cache can be 4308c609719bSwdenklocked as (mis-) used as memory, etc. 4309c609719bSwdenk 43107152b1d0Swdenk Chris Hallinan posted a good summary of these issues to the 43110668236bSWolfgang Denk U-Boot mailing list: 431243d9616cSwdenk 431343d9616cSwdenk Subject: RE: [U-Boot-Users] RE: More On Memory Bank x (nothingness)? 431443d9616cSwdenk From: "Chris Hallinan" <clh@net1plus.com> 431543d9616cSwdenk Date: Mon, 10 Feb 2003 16:43:46 -0500 (22:43 MET) 431643d9616cSwdenk ... 431743d9616cSwdenk 431843d9616cSwdenk Correct me if I'm wrong, folks, but the way I understand it 431943d9616cSwdenk is this: Using DCACHE as initial RAM for Stack, etc, does not 432043d9616cSwdenk require any physical RAM backing up the cache. The cleverness 432143d9616cSwdenk is that the cache is being used as a temporary supply of 432243d9616cSwdenk necessary storage before the SDRAM controller is setup. It's 432311ccc33fSMarcel Ziswiler beyond the scope of this list to explain the details, but you 432443d9616cSwdenk can see how this works by studying the cache architecture and 432543d9616cSwdenk operation in the architecture and processor-specific manuals. 432643d9616cSwdenk 432743d9616cSwdenk OCM is On Chip Memory, which I believe the 405GP has 4K. It 432843d9616cSwdenk is another option for the system designer to use as an 432911ccc33fSMarcel Ziswiler initial stack/RAM area prior to SDRAM being available. Either 433043d9616cSwdenk option should work for you. Using CS 4 should be fine if your 433143d9616cSwdenk board designers haven't used it for something that would 433243d9616cSwdenk cause you grief during the initial boot! It is frequently not 433343d9616cSwdenk used. 433443d9616cSwdenk 43356d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_INIT_RAM_ADDR should be somewhere that won't interfere 433643d9616cSwdenk with your processor/board/system design. The default value 433743d9616cSwdenk you will find in any recent u-boot distribution in 43388a316c9bSStefan Roese walnut.h should work for you. I'd set it to a value larger 433943d9616cSwdenk than your SDRAM module. If you have a 64MB SDRAM module, set 434043d9616cSwdenk it above 400_0000. Just make sure your board has no resources 434143d9616cSwdenk that are supposed to respond to that address! That code in 434243d9616cSwdenk start.S has been around a while and should work as is when 434343d9616cSwdenk you get the config right. 434443d9616cSwdenk 434543d9616cSwdenk -Chris Hallinan 434643d9616cSwdenk DS4.COM, Inc. 434743d9616cSwdenk 4348c609719bSwdenkIt is essential to remember this, since it has some impact on the C 4349c609719bSwdenkcode for the initialization procedures: 4350c609719bSwdenk 4351c609719bSwdenk* Initialized global data (data segment) is read-only. Do not attempt 4352c609719bSwdenk to write it. 4353c609719bSwdenk 435411ccc33fSMarcel Ziswiler* Do not use any uninitialized global data (or implicitely initialized 4355c609719bSwdenk as zero data - BSS segment) at all - this is undefined, initiali- 43567152b1d0Swdenk zation is performed later (when relocating to RAM). 4357c609719bSwdenk 4358c609719bSwdenk* Stack space is very limited. Avoid big data buffers or things like 4359c609719bSwdenk that. 4360c609719bSwdenk 4361c609719bSwdenkHaving only the stack as writable memory limits means we cannot use 4362c609719bSwdenknormal global data to share information beween the code. But it 4363c609719bSwdenkturned out that the implementation of U-Boot can be greatly 4364c609719bSwdenksimplified by making a global data structure (gd_t) available to all 4365c609719bSwdenkfunctions. We could pass a pointer to this data as argument to _all_ 4366c609719bSwdenkfunctions, but this would bloat the code. Instead we use a feature of 4367c609719bSwdenkthe GCC compiler (Global Register Variables) to share the data: we 4368c609719bSwdenkplace a pointer (gd) to the global data into a register which we 4369c609719bSwdenkreserve for this purpose. 4370c609719bSwdenk 43717152b1d0SwdenkWhen choosing a register for such a purpose we are restricted by the 4372c609719bSwdenkrelevant (E)ABI specifications for the current architecture, and by 4373c609719bSwdenkGCC's implementation. 4374c609719bSwdenk 4375c609719bSwdenkFor PowerPC, the following registers have specific use: 4376c609719bSwdenk R1: stack pointer 4377e7670f6cSWolfgang Denk R2: reserved for system use 4378c609719bSwdenk R3-R4: parameter passing and return values 4379c609719bSwdenk R5-R10: parameter passing 4380c609719bSwdenk R13: small data area pointer 4381c609719bSwdenk R30: GOT pointer 4382c609719bSwdenk R31: frame pointer 4383c609719bSwdenk 4384e6bee808SJoakim Tjernlund (U-Boot also uses R12 as internal GOT pointer. r12 4385e6bee808SJoakim Tjernlund is a volatile register so r12 needs to be reset when 4386e6bee808SJoakim Tjernlund going back and forth between asm and C) 4387c609719bSwdenk 4388e7670f6cSWolfgang Denk ==> U-Boot will use R2 to hold a pointer to the global data 4389c609719bSwdenk 4390c609719bSwdenk Note: on PPC, we could use a static initializer (since the 4391c609719bSwdenk address of the global data structure is known at compile time), 4392c609719bSwdenk but it turned out that reserving a register results in somewhat 4393c609719bSwdenk smaller code - although the code savings are not that big (on 4394c609719bSwdenk average for all boards 752 bytes for the whole U-Boot image, 4395c609719bSwdenk 624 text + 127 data). 4396c609719bSwdenk 4397c4db335cSRobin GetzOn Blackfin, the normal C ABI (except for P3) is followed as documented here: 43984c58eb55SMike Frysinger http://docs.blackfin.uclinux.org/doku.php?id=application_binary_interface 43994c58eb55SMike Frysinger 4400c4db335cSRobin Getz ==> U-Boot will use P3 to hold a pointer to the global data 44014c58eb55SMike Frysinger 4402c609719bSwdenkOn ARM, the following registers are used: 4403c609719bSwdenk 4404c609719bSwdenk R0: function argument word/integer result 4405c609719bSwdenk R1-R3: function argument word 4406c609719bSwdenk R9: GOT pointer 4407c609719bSwdenk R10: stack limit (used only if stack checking if enabled) 4408c609719bSwdenk R11: argument (frame) pointer 4409c609719bSwdenk R12: temporary workspace 4410c609719bSwdenk R13: stack pointer 4411c609719bSwdenk R14: link register 4412c609719bSwdenk R15: program counter 4413c609719bSwdenk 4414c609719bSwdenk ==> U-Boot will use R8 to hold a pointer to the global data 4415c609719bSwdenk 44160df01fd3SThomas ChouOn Nios II, the ABI is documented here: 44170df01fd3SThomas Chou http://www.altera.com/literature/hb/nios2/n2cpu_nii51016.pdf 44180df01fd3SThomas Chou 44190df01fd3SThomas Chou ==> U-Boot will use gp to hold a pointer to the global data 44200df01fd3SThomas Chou 44210df01fd3SThomas Chou Note: on Nios II, we give "-G0" option to gcc and don't use gp 44220df01fd3SThomas Chou to access small data sections, so gp is free. 44230df01fd3SThomas Chou 4424*afc1ce82SMacpaul LinOn NDS32, the following registers are used: 4425*afc1ce82SMacpaul Lin 4426*afc1ce82SMacpaul Lin R0-R1: argument/return 4427*afc1ce82SMacpaul Lin R2-R5: argument 4428*afc1ce82SMacpaul Lin R15: temporary register for assembler 4429*afc1ce82SMacpaul Lin R16: trampoline register 4430*afc1ce82SMacpaul Lin R28: frame pointer (FP) 4431*afc1ce82SMacpaul Lin R29: global pointer (GP) 4432*afc1ce82SMacpaul Lin R30: link register (LP) 4433*afc1ce82SMacpaul Lin R31: stack pointer (SP) 4434*afc1ce82SMacpaul Lin PC: program counter (PC) 4435*afc1ce82SMacpaul Lin 4436*afc1ce82SMacpaul Lin ==> U-Boot will use R10 to hold a pointer to the global data 4437*afc1ce82SMacpaul Lin 4438d87080b7SWolfgang DenkNOTE: DECLARE_GLOBAL_DATA_PTR must be used with file-global scope, 4439d87080b7SWolfgang Denkor current versions of GCC may "optimize" the code too much. 4440c609719bSwdenk 4441c609719bSwdenkMemory Management: 4442c609719bSwdenk------------------ 4443c609719bSwdenk 4444c609719bSwdenkU-Boot runs in system state and uses physical addresses, i.e. the 4445c609719bSwdenkMMU is not used either for address mapping nor for memory protection. 4446c609719bSwdenk 4447c609719bSwdenkThe available memory is mapped to fixed addresses using the memory 4448c609719bSwdenkcontroller. In this process, a contiguous block is formed for each 4449c609719bSwdenkmemory type (Flash, SDRAM, SRAM), even when it consists of several 4450c609719bSwdenkphysical memory banks. 4451c609719bSwdenk 4452c609719bSwdenkU-Boot is installed in the first 128 kB of the first Flash bank (on 4453c609719bSwdenkTQM8xxL modules this is the range 0x40000000 ... 0x4001FFFF). After 4454c609719bSwdenkbooting and sizing and initializing DRAM, the code relocates itself 4455c609719bSwdenkto the upper end of DRAM. Immediately below the U-Boot code some 44566d0f6bcfSJean-Christophe PLAGNIOL-VILLARDmemory is reserved for use by malloc() [see CONFIG_SYS_MALLOC_LEN 4457c609719bSwdenkconfiguration setting]. Below that, a structure with global Board 4458c609719bSwdenkInfo data is placed, followed by the stack (growing downward). 4459c609719bSwdenk 4460c609719bSwdenkAdditionally, some exception handler code is copied to the low 8 kB 4461c609719bSwdenkof DRAM (0x00000000 ... 0x00001FFF). 4462c609719bSwdenk 4463c609719bSwdenkSo a typical memory configuration with 16 MB of DRAM could look like 4464c609719bSwdenkthis: 4465c609719bSwdenk 4466c609719bSwdenk 0x0000 0000 Exception Vector code 4467c609719bSwdenk : 4468c609719bSwdenk 0x0000 1FFF 4469c609719bSwdenk 0x0000 2000 Free for Application Use 4470c609719bSwdenk : 4471c609719bSwdenk : 4472c609719bSwdenk 4473c609719bSwdenk : 4474c609719bSwdenk : 4475c609719bSwdenk 0x00FB FF20 Monitor Stack (Growing downward) 4476c609719bSwdenk 0x00FB FFAC Board Info Data and permanent copy of global data 4477c609719bSwdenk 0x00FC 0000 Malloc Arena 4478c609719bSwdenk : 4479c609719bSwdenk 0x00FD FFFF 4480c609719bSwdenk 0x00FE 0000 RAM Copy of Monitor Code 4481c609719bSwdenk ... eventually: LCD or video framebuffer 4482c609719bSwdenk ... eventually: pRAM (Protected RAM - unchanged by reset) 4483c609719bSwdenk 0x00FF FFFF [End of RAM] 4484c609719bSwdenk 4485c609719bSwdenk 4486c609719bSwdenkSystem Initialization: 4487c609719bSwdenk---------------------- 4488c609719bSwdenk 4489c609719bSwdenkIn the reset configuration, U-Boot starts at the reset entry point 449011ccc33fSMarcel Ziswiler(on most PowerPC systems at address 0x00000100). Because of the reset 4491c609719bSwdenkconfiguration for CS0# this is a mirror of the onboard Flash memory. 44927152b1d0SwdenkTo be able to re-map memory U-Boot then jumps to its link address. 4493c609719bSwdenkTo be able to implement the initialization code in C, a (small!) 4494c609719bSwdenkinitial stack is set up in the internal Dual Ported RAM (in case CPUs 4495c609719bSwdenkwhich provide such a feature like MPC8xx or MPC8260), or in a locked 4496c609719bSwdenkpart of the data cache. After that, U-Boot initializes the CPU core, 4497c609719bSwdenkthe caches and the SIU. 4498c609719bSwdenk 4499c609719bSwdenkNext, all (potentially) available memory banks are mapped using a 4500c609719bSwdenkpreliminary mapping. For example, we put them on 512 MB boundaries 4501c609719bSwdenk(multiples of 0x20000000: SDRAM on 0x00000000 and 0x20000000, Flash 4502c609719bSwdenkon 0x40000000 and 0x60000000, SRAM on 0x80000000). Then UPM A is 4503c609719bSwdenkprogrammed for SDRAM access. Using the temporary configuration, a 4504c609719bSwdenksimple memory test is run that determines the size of the SDRAM 4505c609719bSwdenkbanks. 4506c609719bSwdenk 4507c609719bSwdenkWhen there is more than one SDRAM bank, and the banks are of 45087152b1d0Swdenkdifferent size, the largest is mapped first. For equal size, the first 4509c609719bSwdenkbank (CS2#) is mapped first. The first mapping is always for address 4510c609719bSwdenk0x00000000, with any additional banks following immediately to create 4511c609719bSwdenkcontiguous memory starting from 0. 4512c609719bSwdenk 4513c609719bSwdenkThen, the monitor installs itself at the upper end of the SDRAM area 4514c609719bSwdenkand allocates memory for use by malloc() and for the global Board 4515c609719bSwdenkInfo data; also, the exception vector code is copied to the low RAM 4516c609719bSwdenkpages, and the final stack is set up. 4517c609719bSwdenk 4518c609719bSwdenkOnly after this relocation will you have a "normal" C environment; 4519c609719bSwdenkuntil that you are restricted in several ways, mostly because you are 4520c609719bSwdenkrunning from ROM, and because the code will have to be relocated to a 4521c609719bSwdenknew address in RAM. 4522c609719bSwdenk 4523c609719bSwdenk 4524c609719bSwdenkU-Boot Porting Guide: 4525c609719bSwdenk---------------------- 4526c609719bSwdenk 4527c609719bSwdenk[Based on messages by Jerry Van Baren in the U-Boot-Users mailing 45286aff3115Swdenklist, October 2002] 4529c609719bSwdenk 4530c609719bSwdenk 4531c609719bSwdenkint main(int argc, char *argv[]) 4532c609719bSwdenk{ 4533c609719bSwdenk sighandler_t no_more_time; 4534c609719bSwdenk 4535c609719bSwdenk signal(SIGALRM, no_more_time); 4536c609719bSwdenk alarm(PROJECT_DEADLINE - toSec (3 * WEEK)); 4537c609719bSwdenk 4538c609719bSwdenk if (available_money > available_manpower) { 45396c3fef28SJerry Van Baren Pay consultant to port U-Boot; 4540c609719bSwdenk return 0; 4541c609719bSwdenk } 4542c609719bSwdenk 4543c609719bSwdenk Download latest U-Boot source; 4544c609719bSwdenk 45450668236bSWolfgang Denk Subscribe to u-boot mailing list; 45466aff3115Swdenk 45476c3fef28SJerry Van Baren if (clueless) 4548c609719bSwdenk email("Hi, I am new to U-Boot, how do I get started?"); 4549c609719bSwdenk 4550c609719bSwdenk while (learning) { 4551c609719bSwdenk Read the README file in the top level directory; 45527cb22f97Swdenk Read http://www.denx.de/twiki/bin/view/DULG/Manual; 45536c3fef28SJerry Van Baren Read applicable doc/*.README; 4554c609719bSwdenk Read the source, Luke; 45556c3fef28SJerry Van Baren /* find . -name "*.[chS]" | xargs grep -i <keyword> */ 4556c609719bSwdenk } 4557c609719bSwdenk 45586c3fef28SJerry Van Baren if (available_money > toLocalCurrency ($2500)) 45596c3fef28SJerry Van Baren Buy a BDI3000; 45606c3fef28SJerry Van Baren else 4561c609719bSwdenk Add a lot of aggravation and time; 4562c609719bSwdenk 45636c3fef28SJerry Van Baren if (a similar board exists) { /* hopefully... */ 45646c3fef28SJerry Van Baren cp -a board/<similar> board/<myboard> 45656c3fef28SJerry Van Baren cp include/configs/<similar>.h include/configs/<myboard>.h 45666c3fef28SJerry Van Baren } else { 4567c609719bSwdenk Create your own board support subdirectory; 45686c3fef28SJerry Van Baren Create your own board include/configs/<myboard>.h file; 45696c3fef28SJerry Van Baren } 45706c3fef28SJerry Van Baren Edit new board/<myboard> files 45716c3fef28SJerry Van Baren Edit new include/configs/<myboard>.h 4572c609719bSwdenk 45736c3fef28SJerry Van Baren while (!accepted) { 4574c609719bSwdenk while (!running) { 4575c609719bSwdenk do { 4576c609719bSwdenk Add / modify source code; 4577c609719bSwdenk } until (compiles); 4578c609719bSwdenk Debug; 4579c609719bSwdenk if (clueless) 4580c609719bSwdenk email("Hi, I am having problems..."); 4581c609719bSwdenk } 45826c3fef28SJerry Van Baren Send patch file to the U-Boot email list; 45836c3fef28SJerry Van Baren if (reasonable critiques) 45846c3fef28SJerry Van Baren Incorporate improvements from email list code review; 45856c3fef28SJerry Van Baren else 45866c3fef28SJerry Van Baren Defend code as written; 45876c3fef28SJerry Van Baren } 4588c609719bSwdenk 4589c609719bSwdenk return 0; 4590c609719bSwdenk} 4591c609719bSwdenk 4592c609719bSwdenkvoid no_more_time (int sig) 4593c609719bSwdenk{ 4594c609719bSwdenk hire_a_guru(); 4595c609719bSwdenk} 4596c609719bSwdenk 4597c609719bSwdenk 4598c609719bSwdenkCoding Standards: 4599c609719bSwdenk----------------- 4600c609719bSwdenk 4601c609719bSwdenkAll contributions to U-Boot should conform to the Linux kernel 46022c051651SDetlev Zundelcoding style; see the file "Documentation/CodingStyle" and the script 46037ca9296eSWolfgang Denk"scripts/Lindent" in your Linux kernel source directory. 4604c609719bSwdenk 46052c051651SDetlev ZundelSource files originating from a different project (for example the 46062c051651SDetlev ZundelMTD subsystem) are generally exempt from these guidelines and are not 46072c051651SDetlev Zundelreformated to ease subsequent migration to newer versions of those 46082c051651SDetlev Zundelsources. 46092c051651SDetlev Zundel 46102c051651SDetlev ZundelPlease note that U-Boot is implemented in C (and to some small parts in 46112c051651SDetlev ZundelAssembler); no C++ is used, so please do not use C++ style comments (//) 46122c051651SDetlev Zundelin your code. 4613c609719bSwdenk 4614c178d3daSwdenkPlease also stick to the following formatting rules: 4615180d3f74Swdenk- remove any trailing white space 46167ca9296eSWolfgang Denk- use TAB characters for indentation and vertical alignment, not spaces 4617180d3f74Swdenk- make sure NOT to use DOS '\r\n' line feeds 46187ca9296eSWolfgang Denk- do not add more than 2 consecutive empty lines to source files 4619180d3f74Swdenk- do not add trailing empty lines to source files 4620180d3f74Swdenk 4621c609719bSwdenkSubmissions which do not conform to the standards may be returned 4622c609719bSwdenkwith a request to reformat the changes. 4623c609719bSwdenk 4624c609719bSwdenk 4625c609719bSwdenkSubmitting Patches: 4626c609719bSwdenk------------------- 4627c609719bSwdenk 4628c609719bSwdenkSince the number of patches for U-Boot is growing, we need to 4629c609719bSwdenkestablish some rules. Submissions which do not conform to these rules 4630c609719bSwdenkmay be rejected, even when they contain important and valuable stuff. 4631c609719bSwdenk 46320d28f34bSMagnus LiljaPlease see http://www.denx.de/wiki/U-Boot/Patches for details. 4633218ca724SWolfgang Denk 46340668236bSWolfgang DenkPatches shall be sent to the u-boot mailing list <u-boot@lists.denx.de>; 46350668236bSWolfgang Denksee http://lists.denx.de/mailman/listinfo/u-boot 46360668236bSWolfgang Denk 4637c609719bSwdenkWhen you send a patch, please include the following information with 4638c609719bSwdenkit: 4639c609719bSwdenk 4640c609719bSwdenk* For bug fixes: a description of the bug and how your patch fixes 4641c609719bSwdenk this bug. Please try to include a way of demonstrating that the 4642c609719bSwdenk patch actually fixes something. 4643c609719bSwdenk 4644c609719bSwdenk* For new features: a description of the feature and your 4645c609719bSwdenk implementation. 4646c609719bSwdenk 4647c609719bSwdenk* A CHANGELOG entry as plaintext (separate from the patch) 4648c609719bSwdenk 4649c609719bSwdenk* For major contributions, your entry to the CREDITS file 4650c609719bSwdenk 4651c609719bSwdenk* When you add support for a new board, don't forget to add this 46527ca9296eSWolfgang Denk board to the MAINTAINERS file, too. 4653c609719bSwdenk 4654c609719bSwdenk* If your patch adds new configuration options, don't forget to 4655c609719bSwdenk document these in the README file. 4656c609719bSwdenk 4657218ca724SWolfgang Denk* The patch itself. If you are using git (which is *strongly* 4658218ca724SWolfgang Denk recommended) you can easily generate the patch using the 46597ca9296eSWolfgang Denk "git format-patch". If you then use "git send-email" to send it to 4660218ca724SWolfgang Denk the U-Boot mailing list, you will avoid most of the common problems 4661218ca724SWolfgang Denk with some other mail clients. 4662c609719bSwdenk 4663218ca724SWolfgang Denk If you cannot use git, use "diff -purN OLD NEW". If your version of 4664218ca724SWolfgang Denk diff does not support these options, then get the latest version of 4665218ca724SWolfgang Denk GNU diff. 46666dff5529Swdenk 4667218ca724SWolfgang Denk The current directory when running this command shall be the parent 4668218ca724SWolfgang Denk directory of the U-Boot source tree (i. e. please make sure that 4669218ca724SWolfgang Denk your patch includes sufficient directory information for the 4670218ca724SWolfgang Denk affected files). 4671218ca724SWolfgang Denk 4672218ca724SWolfgang Denk We prefer patches as plain text. MIME attachments are discouraged, 4673218ca724SWolfgang Denk and compressed attachments must not be used. 4674c609719bSwdenk 467552f52c14Swdenk* If one logical set of modifications affects or creates several 467652f52c14Swdenk files, all these changes shall be submitted in a SINGLE patch file. 467752f52c14Swdenk 467852f52c14Swdenk* Changesets that contain different, unrelated modifications shall be 467952f52c14Swdenk submitted as SEPARATE patches, one patch per changeset. 468052f52c14Swdenk 468152f52c14Swdenk 4682c609719bSwdenkNotes: 4683c609719bSwdenk 4684c609719bSwdenk* Before sending the patch, run the MAKEALL script on your patched 4685c609719bSwdenk source tree and make sure that no errors or warnings are reported 4686c609719bSwdenk for any of the boards. 4687c609719bSwdenk 4688c609719bSwdenk* Keep your modifications to the necessary minimum: A patch 4689c609719bSwdenk containing several unrelated changes or arbitrary reformats will be 4690c609719bSwdenk returned with a request to re-formatting / split it. 4691c609719bSwdenk 4692c609719bSwdenk* If you modify existing code, make sure that your new code does not 4693c609719bSwdenk add to the memory footprint of the code ;-) Small is beautiful! 4694c609719bSwdenk When adding new features, these should compile conditionally only 4695c609719bSwdenk (using #ifdef), and the resulting code with the new feature 4696c609719bSwdenk disabled must not need more memory than the old code without your 4697c609719bSwdenk modification. 469890dc6704Swdenk 46990668236bSWolfgang Denk* Remember that there is a size limit of 100 kB per message on the 47000668236bSWolfgang Denk u-boot mailing list. Bigger patches will be moderated. If they are 47010668236bSWolfgang Denk reasonable and not too big, they will be acknowledged. But patches 47020668236bSWolfgang Denk bigger than the size limit should be avoided. 4703