1# 2# (C) Copyright 2000 - 2013 3# Wolfgang Denk, DENX Software Engineering, wd@denx.de. 4# 5# SPDX-License-Identifier: GPL-2.0+ 6# 7 8Summary: 9======== 10 11This directory contains the source code for U-Boot, a boot loader for 12Embedded boards based on PowerPC, ARM, MIPS and several other 13processors, which can be installed in a boot ROM and used to 14initialize and test the hardware or to download and run application 15code. 16 17The development of U-Boot is closely related to Linux: some parts of 18the source code originate in the Linux source tree, we have some 19header files in common, and special provision has been made to 20support booting of Linux images. 21 22Some attention has been paid to make this software easily 23configurable and extendable. For instance, all monitor commands are 24implemented with the same call interface, so that it's very easy to 25add new commands. Also, instead of permanently adding rarely used 26code (for instance hardware test utilities) to the monitor, you can 27load and run it dynamically. 28 29 30Status: 31======= 32 33In general, all boards for which a configuration option exists in the 34Makefile have been tested to some extent and can be considered 35"working". In fact, many of them are used in production systems. 36 37In case of problems see the CHANGELOG file to find out who contributed 38the specific port. In addition, there are various MAINTAINERS files 39scattered throughout the U-Boot source identifying the people or 40companies responsible for various boards and subsystems. 41 42Note: As of August, 2010, there is no longer a CHANGELOG file in the 43actual U-Boot source tree; however, it can be created dynamically 44from the Git log using: 45 46 make CHANGELOG 47 48 49Where to get help: 50================== 51 52In case you have questions about, problems with or contributions for 53U-Boot, you should send a message to the U-Boot mailing list at 54<u-boot@lists.denx.de>. There is also an archive of previous traffic 55on the mailing list - please search the archive before asking FAQ's. 56Please see http://lists.denx.de/pipermail/u-boot and 57http://dir.gmane.org/gmane.comp.boot-loaders.u-boot 58 59 60Where to get source code: 61========================= 62 63The U-Boot source code is maintained in the Git repository at 64git://www.denx.de/git/u-boot.git ; you can browse it online at 65http://www.denx.de/cgi-bin/gitweb.cgi?p=u-boot.git;a=summary 66 67The "snapshot" links on this page allow you to download tarballs of 68any version you might be interested in. Official releases are also 69available for FTP download from the ftp://ftp.denx.de/pub/u-boot/ 70directory. 71 72Pre-built (and tested) images are available from 73ftp://ftp.denx.de/pub/u-boot/images/ 74 75 76Where we come from: 77=================== 78 79- start from 8xxrom sources 80- create PPCBoot project (http://sourceforge.net/projects/ppcboot) 81- clean up code 82- make it easier to add custom boards 83- make it possible to add other [PowerPC] CPUs 84- extend functions, especially: 85 * Provide extended interface to Linux boot loader 86 * S-Record download 87 * network boot 88 * PCMCIA / CompactFlash / ATA disk / SCSI ... boot 89- create ARMBoot project (http://sourceforge.net/projects/armboot) 90- add other CPU families (starting with ARM) 91- create U-Boot project (http://sourceforge.net/projects/u-boot) 92- current project page: see http://www.denx.de/wiki/U-Boot 93 94 95Names and Spelling: 96=================== 97 98The "official" name of this project is "Das U-Boot". The spelling 99"U-Boot" shall be used in all written text (documentation, comments 100in source files etc.). Example: 101 102 This is the README file for the U-Boot project. 103 104File names etc. shall be based on the string "u-boot". Examples: 105 106 include/asm-ppc/u-boot.h 107 108 #include <asm/u-boot.h> 109 110Variable names, preprocessor constants etc. shall be either based on 111the string "u_boot" or on "U_BOOT". Example: 112 113 U_BOOT_VERSION u_boot_logo 114 IH_OS_U_BOOT u_boot_hush_start 115 116 117Versioning: 118=========== 119 120Starting with the release in October 2008, the names of the releases 121were changed from numerical release numbers without deeper meaning 122into a time stamp based numbering. Regular releases are identified by 123names consisting of the calendar year and month of the release date. 124Additional fields (if present) indicate release candidates or bug fix 125releases in "stable" maintenance trees. 126 127Examples: 128 U-Boot v2009.11 - Release November 2009 129 U-Boot v2009.11.1 - Release 1 in version November 2009 stable tree 130 U-Boot v2010.09-rc1 - Release candidate 1 for September 2010 release 131 132 133Directory Hierarchy: 134==================== 135 136/arch Architecture specific files 137 /arc Files generic to ARC architecture 138 /arm Files generic to ARM architecture 139 /avr32 Files generic to AVR32 architecture 140 /blackfin Files generic to Analog Devices Blackfin architecture 141 /m68k Files generic to m68k architecture 142 /microblaze Files generic to microblaze architecture 143 /mips Files generic to MIPS architecture 144 /nds32 Files generic to NDS32 architecture 145 /nios2 Files generic to Altera NIOS2 architecture 146 /openrisc Files generic to OpenRISC architecture 147 /powerpc Files generic to PowerPC architecture 148 /sandbox Files generic to HW-independent "sandbox" 149 /sh Files generic to SH architecture 150 /sparc Files generic to SPARC architecture 151 /x86 Files generic to x86 architecture 152/api Machine/arch independent API for external apps 153/board Board dependent files 154/cmd U-Boot commands functions 155/common Misc architecture independent functions 156/configs Board default configuration files 157/disk Code for disk drive partition handling 158/doc Documentation (don't expect too much) 159/drivers Commonly used device drivers 160/dts Contains Makefile for building internal U-Boot fdt. 161/examples Example code for standalone applications, etc. 162/fs Filesystem code (cramfs, ext2, jffs2, etc.) 163/include Header Files 164/lib Library routines generic to all architectures 165/Licenses Various license files 166/net Networking code 167/post Power On Self Test 168/scripts Various build scripts and Makefiles 169/test Various unit test files 170/tools Tools to build S-Record or U-Boot images, etc. 171 172Software Configuration: 173======================= 174 175Configuration is usually done using C preprocessor defines; the 176rationale behind that is to avoid dead code whenever possible. 177 178There are two classes of configuration variables: 179 180* Configuration _OPTIONS_: 181 These are selectable by the user and have names beginning with 182 "CONFIG_". 183 184* Configuration _SETTINGS_: 185 These depend on the hardware etc. and should not be meddled with if 186 you don't know what you're doing; they have names beginning with 187 "CONFIG_SYS_". 188 189Previously, all configuration was done by hand, which involved creating 190symbolic links and editing configuration files manually. More recently, 191U-Boot has added the Kbuild infrastructure used by the Linux kernel, 192allowing you to use the "make menuconfig" command to configure your 193build. 194 195 196Selection of Processor Architecture and Board Type: 197--------------------------------------------------- 198 199For all supported boards there are ready-to-use default 200configurations available; just type "make <board_name>_defconfig". 201 202Example: For a TQM823L module type: 203 204 cd u-boot 205 make TQM823L_defconfig 206 207Note: If you're looking for the default configuration file for a board 208you're sure used to be there but is now missing, check the file 209doc/README.scrapyard for a list of no longer supported boards. 210 211Sandbox Environment: 212-------------------- 213 214U-Boot can be built natively to run on a Linux host using the 'sandbox' 215board. This allows feature development which is not board- or architecture- 216specific to be undertaken on a native platform. The sandbox is also used to 217run some of U-Boot's tests. 218 219See board/sandbox/README.sandbox for more details. 220 221 222Board Initialisation Flow: 223-------------------------- 224 225This is the intended start-up flow for boards. This should apply for both 226SPL and U-Boot proper (i.e. they both follow the same rules). 227 228Note: "SPL" stands for "Secondary Program Loader," which is explained in 229more detail later in this file. 230 231At present, SPL mostly uses a separate code path, but the function names 232and roles of each function are the same. Some boards or architectures 233may not conform to this. At least most ARM boards which use 234CONFIG_SPL_FRAMEWORK conform to this. 235 236Execution typically starts with an architecture-specific (and possibly 237CPU-specific) start.S file, such as: 238 239 - arch/arm/cpu/armv7/start.S 240 - arch/powerpc/cpu/mpc83xx/start.S 241 - arch/mips/cpu/start.S 242 243and so on. From there, three functions are called; the purpose and 244limitations of each of these functions are described below. 245 246lowlevel_init(): 247 - purpose: essential init to permit execution to reach board_init_f() 248 - no global_data or BSS 249 - there is no stack (ARMv7 may have one but it will soon be removed) 250 - must not set up SDRAM or use console 251 - must only do the bare minimum to allow execution to continue to 252 board_init_f() 253 - this is almost never needed 254 - return normally from this function 255 256board_init_f(): 257 - purpose: set up the machine ready for running board_init_r(): 258 i.e. SDRAM and serial UART 259 - global_data is available 260 - stack is in SRAM 261 - BSS is not available, so you cannot use global/static variables, 262 only stack variables and global_data 263 264 Non-SPL-specific notes: 265 - dram_init() is called to set up DRAM. If already done in SPL this 266 can do nothing 267 268 SPL-specific notes: 269 - you can override the entire board_init_f() function with your own 270 version as needed. 271 - preloader_console_init() can be called here in extremis 272 - should set up SDRAM, and anything needed to make the UART work 273 - these is no need to clear BSS, it will be done by crt0.S 274 - must return normally from this function (don't call board_init_r() 275 directly) 276 277Here the BSS is cleared. For SPL, if CONFIG_SPL_STACK_R is defined, then at 278this point the stack and global_data are relocated to below 279CONFIG_SPL_STACK_R_ADDR. For non-SPL, U-Boot is relocated to run at the top of 280memory. 281 282board_init_r(): 283 - purpose: main execution, common code 284 - global_data is available 285 - SDRAM is available 286 - BSS is available, all static/global variables can be used 287 - execution eventually continues to main_loop() 288 289 Non-SPL-specific notes: 290 - U-Boot is relocated to the top of memory and is now running from 291 there. 292 293 SPL-specific notes: 294 - stack is optionally in SDRAM, if CONFIG_SPL_STACK_R is defined and 295 CONFIG_SPL_STACK_R_ADDR points into SDRAM 296 - preloader_console_init() can be called here - typically this is 297 done by defining CONFIG_SPL_BOARD_INIT and then supplying a 298 spl_board_init() function containing this call 299 - loads U-Boot or (in falcon mode) Linux 300 301 302 303Configuration Options: 304---------------------- 305 306Configuration depends on the combination of board and CPU type; all 307such information is kept in a configuration file 308"include/configs/<board_name>.h". 309 310Example: For a TQM823L module, all configuration settings are in 311"include/configs/TQM823L.h". 312 313 314Many of the options are named exactly as the corresponding Linux 315kernel configuration options. The intention is to make it easier to 316build a config tool - later. 317 318 319The following options need to be configured: 320 321- CPU Type: Define exactly one, e.g. CONFIG_MPC85XX. 322 323- Board Type: Define exactly one, e.g. CONFIG_MPC8540ADS. 324 325- CPU Daughterboard Type: (if CONFIG_ATSTK1000 is defined) 326 Define exactly one, e.g. CONFIG_ATSTK1002 327 328- Marvell Family Member 329 CONFIG_SYS_MVFS - define it if you want to enable 330 multiple fs option at one time 331 for marvell soc family 332 333- 8xx CPU Options: (if using an MPC8xx CPU) 334 CONFIG_8xx_GCLK_FREQ - deprecated: CPU clock if 335 get_gclk_freq() cannot work 336 e.g. if there is no 32KHz 337 reference PIT/RTC clock 338 CONFIG_8xx_OSCLK - PLL input clock (either EXTCLK 339 or XTAL/EXTAL) 340 341- 859/866/885 CPU options: (if using a MPC859 or MPC866 or MPC885 CPU): 342 CONFIG_SYS_8xx_CPUCLK_MIN 343 CONFIG_SYS_8xx_CPUCLK_MAX 344 CONFIG_8xx_CPUCLK_DEFAULT 345 See doc/README.MPC866 346 347 CONFIG_SYS_MEASURE_CPUCLK 348 349 Define this to measure the actual CPU clock instead 350 of relying on the correctness of the configured 351 values. Mostly useful for board bringup to make sure 352 the PLL is locked at the intended frequency. Note 353 that this requires a (stable) reference clock (32 kHz 354 RTC clock or CONFIG_SYS_8XX_XIN) 355 356 CONFIG_SYS_DELAYED_ICACHE 357 358 Define this option if you want to enable the 359 ICache only when Code runs from RAM. 360 361- 85xx CPU Options: 362 CONFIG_SYS_PPC64 363 364 Specifies that the core is a 64-bit PowerPC implementation (implements 365 the "64" category of the Power ISA). This is necessary for ePAPR 366 compliance, among other possible reasons. 367 368 CONFIG_SYS_FSL_TBCLK_DIV 369 370 Defines the core time base clock divider ratio compared to the 371 system clock. On most PQ3 devices this is 8, on newer QorIQ 372 devices it can be 16 or 32. The ratio varies from SoC to Soc. 373 374 CONFIG_SYS_FSL_PCIE_COMPAT 375 376 Defines the string to utilize when trying to match PCIe device 377 tree nodes for the given platform. 378 379 CONFIG_SYS_FSL_ERRATUM_A004510 380 381 Enables a workaround for erratum A004510. If set, 382 then CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV and 383 CONFIG_SYS_FSL_CORENET_SNOOPVEC_COREONLY must be set. 384 385 CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV 386 CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV2 (optional) 387 388 Defines one or two SoC revisions (low 8 bits of SVR) 389 for which the A004510 workaround should be applied. 390 391 The rest of SVR is either not relevant to the decision 392 of whether the erratum is present (e.g. p2040 versus 393 p2041) or is implied by the build target, which controls 394 whether CONFIG_SYS_FSL_ERRATUM_A004510 is set. 395 396 See Freescale App Note 4493 for more information about 397 this erratum. 398 399 CONFIG_A003399_NOR_WORKAROUND 400 Enables a workaround for IFC erratum A003399. It is only 401 required during NOR boot. 402 403 CONFIG_A008044_WORKAROUND 404 Enables a workaround for T1040/T1042 erratum A008044. It is only 405 required during NAND boot and valid for Rev 1.0 SoC revision 406 407 CONFIG_SYS_FSL_CORENET_SNOOPVEC_COREONLY 408 409 This is the value to write into CCSR offset 0x18600 410 according to the A004510 workaround. 411 412 CONFIG_SYS_FSL_DSP_DDR_ADDR 413 This value denotes start offset of DDR memory which is 414 connected exclusively to the DSP cores. 415 416 CONFIG_SYS_FSL_DSP_M2_RAM_ADDR 417 This value denotes start offset of M2 memory 418 which is directly connected to the DSP core. 419 420 CONFIG_SYS_FSL_DSP_M3_RAM_ADDR 421 This value denotes start offset of M3 memory which is directly 422 connected to the DSP core. 423 424 CONFIG_SYS_FSL_DSP_CCSRBAR_DEFAULT 425 This value denotes start offset of DSP CCSR space. 426 427 CONFIG_SYS_FSL_SINGLE_SOURCE_CLK 428 Single Source Clock is clocking mode present in some of FSL SoC's. 429 In this mode, a single differential clock is used to supply 430 clocks to the sysclock, ddrclock and usbclock. 431 432 CONFIG_SYS_CPC_REINIT_F 433 This CONFIG is defined when the CPC is configured as SRAM at the 434 time of U-Boot entry and is required to be re-initialized. 435 436 CONFIG_DEEP_SLEEP 437 Indicates this SoC supports deep sleep feature. If deep sleep is 438 supported, core will start to execute uboot when wakes up. 439 440- Generic CPU options: 441 CONFIG_SYS_GENERIC_GLOBAL_DATA 442 Defines global data is initialized in generic board board_init_f(). 443 If this macro is defined, global data is created and cleared in 444 generic board board_init_f(). Without this macro, architecture/board 445 should initialize global data before calling board_init_f(). 446 447 CONFIG_SYS_BIG_ENDIAN, CONFIG_SYS_LITTLE_ENDIAN 448 449 Defines the endianess of the CPU. Implementation of those 450 values is arch specific. 451 452 CONFIG_SYS_FSL_DDR 453 Freescale DDR driver in use. This type of DDR controller is 454 found in mpc83xx, mpc85xx, mpc86xx as well as some ARM core 455 SoCs. 456 457 CONFIG_SYS_FSL_DDR_ADDR 458 Freescale DDR memory-mapped register base. 459 460 CONFIG_SYS_FSL_DDR_EMU 461 Specify emulator support for DDR. Some DDR features such as 462 deskew training are not available. 463 464 CONFIG_SYS_FSL_DDRC_GEN1 465 Freescale DDR1 controller. 466 467 CONFIG_SYS_FSL_DDRC_GEN2 468 Freescale DDR2 controller. 469 470 CONFIG_SYS_FSL_DDRC_GEN3 471 Freescale DDR3 controller. 472 473 CONFIG_SYS_FSL_DDRC_GEN4 474 Freescale DDR4 controller. 475 476 CONFIG_SYS_FSL_DDRC_ARM_GEN3 477 Freescale DDR3 controller for ARM-based SoCs. 478 479 CONFIG_SYS_FSL_DDR1 480 Board config to use DDR1. It can be enabled for SoCs with 481 Freescale DDR1 or DDR2 controllers, depending on the board 482 implemetation. 483 484 CONFIG_SYS_FSL_DDR2 485 Board config to use DDR2. It can be enabled for SoCs with 486 Freescale DDR2 or DDR3 controllers, depending on the board 487 implementation. 488 489 CONFIG_SYS_FSL_DDR3 490 Board config to use DDR3. It can be enabled for SoCs with 491 Freescale DDR3 or DDR3L controllers. 492 493 CONFIG_SYS_FSL_DDR3L 494 Board config to use DDR3L. It can be enabled for SoCs with 495 DDR3L controllers. 496 497 CONFIG_SYS_FSL_DDR4 498 Board config to use DDR4. It can be enabled for SoCs with 499 DDR4 controllers. 500 501 CONFIG_SYS_FSL_IFC_BE 502 Defines the IFC controller register space as Big Endian 503 504 CONFIG_SYS_FSL_IFC_LE 505 Defines the IFC controller register space as Little Endian 506 507 CONFIG_SYS_FSL_PBL_PBI 508 It enables addition of RCW (Power on reset configuration) in built image. 509 Please refer doc/README.pblimage for more details 510 511 CONFIG_SYS_FSL_PBL_RCW 512 It adds PBI(pre-boot instructions) commands in u-boot build image. 513 PBI commands can be used to configure SoC before it starts the execution. 514 Please refer doc/README.pblimage for more details 515 516 CONFIG_SPL_FSL_PBL 517 It adds a target to create boot binary having SPL binary in PBI format 518 concatenated with u-boot binary. 519 520 CONFIG_SYS_FSL_DDR_BE 521 Defines the DDR controller register space as Big Endian 522 523 CONFIG_SYS_FSL_DDR_LE 524 Defines the DDR controller register space as Little Endian 525 526 CONFIG_SYS_FSL_DDR_SDRAM_BASE_PHY 527 Physical address from the view of DDR controllers. It is the 528 same as CONFIG_SYS_DDR_SDRAM_BASE for all Power SoCs. But 529 it could be different for ARM SoCs. 530 531 CONFIG_SYS_FSL_DDR_INTLV_256B 532 DDR controller interleaving on 256-byte. This is a special 533 interleaving mode, handled by Dickens for Freescale layerscape 534 SoCs with ARM core. 535 536 CONFIG_SYS_FSL_DDR_MAIN_NUM_CTRLS 537 Number of controllers used as main memory. 538 539 CONFIG_SYS_FSL_OTHER_DDR_NUM_CTRLS 540 Number of controllers used for other than main memory. 541 542 CONFIG_SYS_FSL_HAS_DP_DDR 543 Defines the SoC has DP-DDR used for DPAA. 544 545 CONFIG_SYS_FSL_SEC_BE 546 Defines the SEC controller register space as Big Endian 547 548 CONFIG_SYS_FSL_SEC_LE 549 Defines the SEC controller register space as Little Endian 550 551- MIPS CPU options: 552 CONFIG_SYS_INIT_SP_OFFSET 553 554 Offset relative to CONFIG_SYS_SDRAM_BASE for initial stack 555 pointer. This is needed for the temporary stack before 556 relocation. 557 558 CONFIG_SYS_MIPS_CACHE_MODE 559 560 Cache operation mode for the MIPS CPU. 561 See also arch/mips/include/asm/mipsregs.h. 562 Possible values are: 563 CONF_CM_CACHABLE_NO_WA 564 CONF_CM_CACHABLE_WA 565 CONF_CM_UNCACHED 566 CONF_CM_CACHABLE_NONCOHERENT 567 CONF_CM_CACHABLE_CE 568 CONF_CM_CACHABLE_COW 569 CONF_CM_CACHABLE_CUW 570 CONF_CM_CACHABLE_ACCELERATED 571 572 CONFIG_SYS_XWAY_EBU_BOOTCFG 573 574 Special option for Lantiq XWAY SoCs for booting from NOR flash. 575 See also arch/mips/cpu/mips32/start.S. 576 577 CONFIG_XWAY_SWAP_BYTES 578 579 Enable compilation of tools/xway-swap-bytes needed for Lantiq 580 XWAY SoCs for booting from NOR flash. The U-Boot image needs to 581 be swapped if a flash programmer is used. 582 583- ARM options: 584 CONFIG_SYS_EXCEPTION_VECTORS_HIGH 585 586 Select high exception vectors of the ARM core, e.g., do not 587 clear the V bit of the c1 register of CP15. 588 589 CONFIG_SYS_THUMB_BUILD 590 591 Use this flag to build U-Boot using the Thumb instruction 592 set for ARM architectures. Thumb instruction set provides 593 better code density. For ARM architectures that support 594 Thumb2 this flag will result in Thumb2 code generated by 595 GCC. 596 597 CONFIG_ARM_ERRATA_716044 598 CONFIG_ARM_ERRATA_742230 599 CONFIG_ARM_ERRATA_743622 600 CONFIG_ARM_ERRATA_751472 601 CONFIG_ARM_ERRATA_761320 602 CONFIG_ARM_ERRATA_773022 603 CONFIG_ARM_ERRATA_774769 604 CONFIG_ARM_ERRATA_794072 605 606 If set, the workarounds for these ARM errata are applied early 607 during U-Boot startup. Note that these options force the 608 workarounds to be applied; no CPU-type/version detection 609 exists, unlike the similar options in the Linux kernel. Do not 610 set these options unless they apply! 611 612 COUNTER_FREQUENCY 613 Generic timer clock source frequency. 614 615 COUNTER_FREQUENCY_REAL 616 Generic timer clock source frequency if the real clock is 617 different from COUNTER_FREQUENCY, and can only be determined 618 at run time. 619 620 NOTE: The following can be machine specific errata. These 621 do have ability to provide rudimentary version and machine 622 specific checks, but expect no product checks. 623 CONFIG_ARM_ERRATA_430973 624 CONFIG_ARM_ERRATA_454179 625 CONFIG_ARM_ERRATA_621766 626 CONFIG_ARM_ERRATA_798870 627 CONFIG_ARM_ERRATA_801819 628 629- Tegra SoC options: 630 CONFIG_TEGRA_SUPPORT_NON_SECURE 631 632 Support executing U-Boot in non-secure (NS) mode. Certain 633 impossible actions will be skipped if the CPU is in NS mode, 634 such as ARM architectural timer initialization. 635 636- Linux Kernel Interface: 637 CONFIG_CLOCKS_IN_MHZ 638 639 U-Boot stores all clock information in Hz 640 internally. For binary compatibility with older Linux 641 kernels (which expect the clocks passed in the 642 bd_info data to be in MHz) the environment variable 643 "clocks_in_mhz" can be defined so that U-Boot 644 converts clock data to MHZ before passing it to the 645 Linux kernel. 646 When CONFIG_CLOCKS_IN_MHZ is defined, a definition of 647 "clocks_in_mhz=1" is automatically included in the 648 default environment. 649 650 CONFIG_MEMSIZE_IN_BYTES [relevant for MIPS only] 651 652 When transferring memsize parameter to Linux, some versions 653 expect it to be in bytes, others in MB. 654 Define CONFIG_MEMSIZE_IN_BYTES to make it in bytes. 655 656 CONFIG_OF_LIBFDT 657 658 New kernel versions are expecting firmware settings to be 659 passed using flattened device trees (based on open firmware 660 concepts). 661 662 CONFIG_OF_LIBFDT 663 * New libfdt-based support 664 * Adds the "fdt" command 665 * The bootm command automatically updates the fdt 666 667 OF_CPU - The proper name of the cpus node (only required for 668 MPC512X and MPC5xxx based boards). 669 OF_SOC - The proper name of the soc node (only required for 670 MPC512X and MPC5xxx based boards). 671 OF_TBCLK - The timebase frequency. 672 OF_STDOUT_PATH - The path to the console device 673 674 boards with QUICC Engines require OF_QE to set UCC MAC 675 addresses 676 677 CONFIG_OF_BOARD_SETUP 678 679 Board code has addition modification that it wants to make 680 to the flat device tree before handing it off to the kernel 681 682 CONFIG_OF_SYSTEM_SETUP 683 684 Other code has addition modification that it wants to make 685 to the flat device tree before handing it off to the kernel. 686 This causes ft_system_setup() to be called before booting 687 the kernel. 688 689 CONFIG_OF_IDE_FIXUP 690 691 U-Boot can detect if an IDE device is present or not. 692 If not, and this new config option is activated, U-Boot 693 removes the ATA node from the DTS before booting Linux, 694 so the Linux IDE driver does not probe the device and 695 crash. This is needed for buggy hardware (uc101) where 696 no pull down resistor is connected to the signal IDE5V_DD7. 697 698 CONFIG_MACH_TYPE [relevant for ARM only][mandatory] 699 700 This setting is mandatory for all boards that have only one 701 machine type and must be used to specify the machine type 702 number as it appears in the ARM machine registry 703 (see http://www.arm.linux.org.uk/developer/machines/). 704 Only boards that have multiple machine types supported 705 in a single configuration file and the machine type is 706 runtime discoverable, do not have to use this setting. 707 708- vxWorks boot parameters: 709 710 bootvx constructs a valid bootline using the following 711 environments variables: bootdev, bootfile, ipaddr, netmask, 712 serverip, gatewayip, hostname, othbootargs. 713 It loads the vxWorks image pointed bootfile. 714 715 Note: If a "bootargs" environment is defined, it will overwride 716 the defaults discussed just above. 717 718- Cache Configuration: 719 CONFIG_SYS_ICACHE_OFF - Do not enable instruction cache in U-Boot 720 CONFIG_SYS_DCACHE_OFF - Do not enable data cache in U-Boot 721 CONFIG_SYS_L2CACHE_OFF- Do not enable L2 cache in U-Boot 722 723- Cache Configuration for ARM: 724 CONFIG_SYS_L2_PL310 - Enable support for ARM PL310 L2 cache 725 controller 726 CONFIG_SYS_PL310_BASE - Physical base address of PL310 727 controller register space 728 729- Serial Ports: 730 CONFIG_PL010_SERIAL 731 732 Define this if you want support for Amba PrimeCell PL010 UARTs. 733 734 CONFIG_PL011_SERIAL 735 736 Define this if you want support for Amba PrimeCell PL011 UARTs. 737 738 CONFIG_PL011_CLOCK 739 740 If you have Amba PrimeCell PL011 UARTs, set this variable to 741 the clock speed of the UARTs. 742 743 CONFIG_PL01x_PORTS 744 745 If you have Amba PrimeCell PL010 or PL011 UARTs on your board, 746 define this to a list of base addresses for each (supported) 747 port. See e.g. include/configs/versatile.h 748 749 CONFIG_SERIAL_HW_FLOW_CONTROL 750 751 Define this variable to enable hw flow control in serial driver. 752 Current user of this option is drivers/serial/nsl16550.c driver 753 754- Console Interface: 755 Depending on board, define exactly one serial port 756 (like CONFIG_8xx_CONS_SMC1, CONFIG_8xx_CONS_SMC2, 757 CONFIG_8xx_CONS_SCC1, ...), or switch off the serial 758 console by defining CONFIG_8xx_CONS_NONE 759 760 Note: if CONFIG_8xx_CONS_NONE is defined, the serial 761 port routines must be defined elsewhere 762 (i.e. serial_init(), serial_getc(), ...) 763 764- Console Baudrate: 765 CONFIG_BAUDRATE - in bps 766 Select one of the baudrates listed in 767 CONFIG_SYS_BAUDRATE_TABLE, see below. 768 CONFIG_SYS_BRGCLK_PRESCALE, baudrate prescale 769 770- Console Rx buffer length 771 With CONFIG_SYS_SMC_RXBUFLEN it is possible to define 772 the maximum receive buffer length for the SMC. 773 This option is actual only for 82xx and 8xx possible. 774 If using CONFIG_SYS_SMC_RXBUFLEN also CONFIG_SYS_MAXIDLE 775 must be defined, to setup the maximum idle timeout for 776 the SMC. 777 778- Autoboot Command: 779 CONFIG_BOOTCOMMAND 780 Only needed when CONFIG_BOOTDELAY is enabled; 781 define a command string that is automatically executed 782 when no character is read on the console interface 783 within "Boot Delay" after reset. 784 785 CONFIG_BOOTARGS 786 This can be used to pass arguments to the bootm 787 command. The value of CONFIG_BOOTARGS goes into the 788 environment value "bootargs". 789 790 CONFIG_RAMBOOT and CONFIG_NFSBOOT 791 The value of these goes into the environment as 792 "ramboot" and "nfsboot" respectively, and can be used 793 as a convenience, when switching between booting from 794 RAM and NFS. 795 796- Bootcount: 797 CONFIG_BOOTCOUNT_LIMIT 798 Implements a mechanism for detecting a repeating reboot 799 cycle, see: 800 http://www.denx.de/wiki/view/DULG/UBootBootCountLimit 801 802 CONFIG_BOOTCOUNT_ENV 803 If no softreset save registers are found on the hardware 804 "bootcount" is stored in the environment. To prevent a 805 saveenv on all reboots, the environment variable 806 "upgrade_available" is used. If "upgrade_available" is 807 0, "bootcount" is always 0, if "upgrade_available" is 808 1 "bootcount" is incremented in the environment. 809 So the Userspace Applikation must set the "upgrade_available" 810 and "bootcount" variable to 0, if a boot was successfully. 811 812- Pre-Boot Commands: 813 CONFIG_PREBOOT 814 815 When this option is #defined, the existence of the 816 environment variable "preboot" will be checked 817 immediately before starting the CONFIG_BOOTDELAY 818 countdown and/or running the auto-boot command resp. 819 entering interactive mode. 820 821 This feature is especially useful when "preboot" is 822 automatically generated or modified. For an example 823 see the LWMON board specific code: here "preboot" is 824 modified when the user holds down a certain 825 combination of keys on the (special) keyboard when 826 booting the systems 827 828- Serial Download Echo Mode: 829 CONFIG_LOADS_ECHO 830 If defined to 1, all characters received during a 831 serial download (using the "loads" command) are 832 echoed back. This might be needed by some terminal 833 emulations (like "cu"), but may as well just take 834 time on others. This setting #define's the initial 835 value of the "loads_echo" environment variable. 836 837- Kgdb Serial Baudrate: (if CONFIG_CMD_KGDB is defined) 838 CONFIG_KGDB_BAUDRATE 839 Select one of the baudrates listed in 840 CONFIG_SYS_BAUDRATE_TABLE, see below. 841 842- Monitor Functions: 843 Monitor commands can be included or excluded 844 from the build by using the #include files 845 <config_cmd_all.h> and #undef'ing unwanted 846 commands, or adding #define's for wanted commands. 847 848 The default command configuration includes all commands 849 except those marked below with a "*". 850 851 CONFIG_CMD_AES AES 128 CBC encrypt/decrypt 852 CONFIG_CMD_ASKENV * ask for env variable 853 CONFIG_CMD_BDI bdinfo 854 CONFIG_CMD_BEDBUG * Include BedBug Debugger 855 CONFIG_CMD_BMP * BMP support 856 CONFIG_CMD_BSP * Board specific commands 857 CONFIG_CMD_BOOTD bootd 858 CONFIG_CMD_BOOTI * ARM64 Linux kernel Image support 859 CONFIG_CMD_CACHE * icache, dcache 860 CONFIG_CMD_CLK * clock command support 861 CONFIG_CMD_CONSOLE coninfo 862 CONFIG_CMD_CRC32 * crc32 863 CONFIG_CMD_DATE * support for RTC, date/time... 864 CONFIG_CMD_DHCP * DHCP support 865 CONFIG_CMD_DIAG * Diagnostics 866 CONFIG_CMD_DS4510 * ds4510 I2C gpio commands 867 CONFIG_CMD_DS4510_INFO * ds4510 I2C info command 868 CONFIG_CMD_DS4510_MEM * ds4510 I2C eeprom/sram commansd 869 CONFIG_CMD_DS4510_RST * ds4510 I2C rst command 870 CONFIG_CMD_DTT * Digital Therm and Thermostat 871 CONFIG_CMD_ECHO echo arguments 872 CONFIG_CMD_EDITENV edit env variable 873 CONFIG_CMD_EEPROM * EEPROM read/write support 874 CONFIG_CMD_EEPROM_LAYOUT* EEPROM layout aware commands 875 CONFIG_CMD_ELF * bootelf, bootvx 876 CONFIG_CMD_ENV_CALLBACK * display details about env callbacks 877 CONFIG_CMD_ENV_FLAGS * display details about env flags 878 CONFIG_CMD_ENV_EXISTS * check existence of env variable 879 CONFIG_CMD_EXPORTENV * export the environment 880 CONFIG_CMD_EXT2 * ext2 command support 881 CONFIG_CMD_EXT4 * ext4 command support 882 CONFIG_CMD_FS_GENERIC * filesystem commands (e.g. load, ls) 883 that work for multiple fs types 884 CONFIG_CMD_FS_UUID * Look up a filesystem UUID 885 CONFIG_CMD_SAVEENV saveenv 886 CONFIG_CMD_FDC * Floppy Disk Support 887 CONFIG_CMD_FAT * FAT command support 888 CONFIG_CMD_FLASH flinfo, erase, protect 889 CONFIG_CMD_FPGA FPGA device initialization support 890 CONFIG_CMD_FUSE * Device fuse support 891 CONFIG_CMD_GETTIME * Get time since boot 892 CONFIG_CMD_GO * the 'go' command (exec code) 893 CONFIG_CMD_GREPENV * search environment 894 CONFIG_CMD_HASH * calculate hash / digest 895 CONFIG_CMD_I2C * I2C serial bus support 896 CONFIG_CMD_IDE * IDE harddisk support 897 CONFIG_CMD_IMI iminfo 898 CONFIG_CMD_IMLS List all images found in NOR flash 899 CONFIG_CMD_IMLS_NAND * List all images found in NAND flash 900 CONFIG_CMD_IMMAP * IMMR dump support 901 CONFIG_CMD_IOTRACE * I/O tracing for debugging 902 CONFIG_CMD_IMPORTENV * import an environment 903 CONFIG_CMD_INI * import data from an ini file into the env 904 CONFIG_CMD_IRQ * irqinfo 905 CONFIG_CMD_ITEST Integer/string test of 2 values 906 CONFIG_CMD_JFFS2 * JFFS2 Support 907 CONFIG_CMD_KGDB * kgdb 908 CONFIG_CMD_LDRINFO * ldrinfo (display Blackfin loader) 909 CONFIG_CMD_LINK_LOCAL * link-local IP address auto-configuration 910 (169.254.*.*) 911 CONFIG_CMD_LOADB loadb 912 CONFIG_CMD_LOADS loads 913 CONFIG_CMD_MD5SUM * print md5 message digest 914 (requires CONFIG_CMD_MEMORY and CONFIG_MD5) 915 CONFIG_CMD_MEMINFO * Display detailed memory information 916 CONFIG_CMD_MEMORY md, mm, nm, mw, cp, cmp, crc, base, 917 loop, loopw 918 CONFIG_CMD_MEMTEST * mtest 919 CONFIG_CMD_MISC Misc functions like sleep etc 920 CONFIG_CMD_MMC * MMC memory mapped support 921 CONFIG_CMD_MII * MII utility commands 922 CONFIG_CMD_MTDPARTS * MTD partition support 923 CONFIG_CMD_NAND * NAND support 924 CONFIG_CMD_NET bootp, tftpboot, rarpboot 925 CONFIG_CMD_NFS NFS support 926 CONFIG_CMD_PCA953X * PCA953x I2C gpio commands 927 CONFIG_CMD_PCA953X_INFO * PCA953x I2C gpio info command 928 CONFIG_CMD_PCI * pciinfo 929 CONFIG_CMD_PCMCIA * PCMCIA support 930 CONFIG_CMD_PING * send ICMP ECHO_REQUEST to network 931 host 932 CONFIG_CMD_PORTIO * Port I/O 933 CONFIG_CMD_READ * Read raw data from partition 934 CONFIG_CMD_REGINFO * Register dump 935 CONFIG_CMD_RUN run command in env variable 936 CONFIG_CMD_SANDBOX * sb command to access sandbox features 937 CONFIG_CMD_SAVES * save S record dump 938 CONFIG_SCSI * SCSI Support 939 CONFIG_CMD_SDRAM * print SDRAM configuration information 940 (requires CONFIG_CMD_I2C) 941 CONFIG_CMD_SETGETDCR Support for DCR Register access 942 (4xx only) 943 CONFIG_CMD_SF * Read/write/erase SPI NOR flash 944 CONFIG_CMD_SHA1SUM * print sha1 memory digest 945 (requires CONFIG_CMD_MEMORY) 946 CONFIG_CMD_SOFTSWITCH * Soft switch setting command for BF60x 947 CONFIG_CMD_SOURCE "source" command Support 948 CONFIG_CMD_SPI * SPI serial bus support 949 CONFIG_CMD_TFTPSRV * TFTP transfer in server mode 950 CONFIG_CMD_TFTPPUT * TFTP put command (upload) 951 CONFIG_CMD_TIME * run command and report execution time (ARM specific) 952 CONFIG_CMD_TIMER * access to the system tick timer 953 CONFIG_CMD_USB * USB support 954 CONFIG_CMD_CDP * Cisco Discover Protocol support 955 CONFIG_CMD_MFSL * Microblaze FSL support 956 CONFIG_CMD_XIMG Load part of Multi Image 957 CONFIG_CMD_UUID * Generate random UUID or GUID string 958 959 EXAMPLE: If you want all functions except of network 960 support you can write: 961 962 #include "config_cmd_all.h" 963 #undef CONFIG_CMD_NET 964 965 Other Commands: 966 fdt (flattened device tree) command: CONFIG_OF_LIBFDT 967 968 Note: Don't enable the "icache" and "dcache" commands 969 (configuration option CONFIG_CMD_CACHE) unless you know 970 what you (and your U-Boot users) are doing. Data 971 cache cannot be enabled on systems like the 8xx or 972 8260 (where accesses to the IMMR region must be 973 uncached), and it cannot be disabled on all other 974 systems where we (mis-) use the data cache to hold an 975 initial stack and some data. 976 977 978 XXX - this list needs to get updated! 979 980- Removal of commands 981 If no commands are needed to boot, you can disable 982 CONFIG_CMDLINE to remove them. In this case, the command line 983 will not be available, and when U-Boot wants to execute the 984 boot command (on start-up) it will call board_run_command() 985 instead. This can reduce image size significantly for very 986 simple boot procedures. 987 988- Regular expression support: 989 CONFIG_REGEX 990 If this variable is defined, U-Boot is linked against 991 the SLRE (Super Light Regular Expression) library, 992 which adds regex support to some commands, as for 993 example "env grep" and "setexpr". 994 995- Device tree: 996 CONFIG_OF_CONTROL 997 If this variable is defined, U-Boot will use a device tree 998 to configure its devices, instead of relying on statically 999 compiled #defines in the board file. This option is 1000 experimental and only available on a few boards. The device 1001 tree is available in the global data as gd->fdt_blob. 1002 1003 U-Boot needs to get its device tree from somewhere. This can 1004 be done using one of the two options below: 1005 1006 CONFIG_OF_EMBED 1007 If this variable is defined, U-Boot will embed a device tree 1008 binary in its image. This device tree file should be in the 1009 board directory and called <soc>-<board>.dts. The binary file 1010 is then picked up in board_init_f() and made available through 1011 the global data structure as gd->blob. 1012 1013 CONFIG_OF_SEPARATE 1014 If this variable is defined, U-Boot will build a device tree 1015 binary. It will be called u-boot.dtb. Architecture-specific 1016 code will locate it at run-time. Generally this works by: 1017 1018 cat u-boot.bin u-boot.dtb >image.bin 1019 1020 and in fact, U-Boot does this for you, creating a file called 1021 u-boot-dtb.bin which is useful in the common case. You can 1022 still use the individual files if you need something more 1023 exotic. 1024 1025- Watchdog: 1026 CONFIG_WATCHDOG 1027 If this variable is defined, it enables watchdog 1028 support for the SoC. There must be support in the SoC 1029 specific code for a watchdog. For the 8xx and 8260 1030 CPUs, the SIU Watchdog feature is enabled in the SYPCR 1031 register. When supported for a specific SoC is 1032 available, then no further board specific code should 1033 be needed to use it. 1034 1035 CONFIG_HW_WATCHDOG 1036 When using a watchdog circuitry external to the used 1037 SoC, then define this variable and provide board 1038 specific code for the "hw_watchdog_reset" function. 1039 1040 CONFIG_AT91_HW_WDT_TIMEOUT 1041 specify the timeout in seconds. default 2 seconds. 1042 1043- U-Boot Version: 1044 CONFIG_VERSION_VARIABLE 1045 If this variable is defined, an environment variable 1046 named "ver" is created by U-Boot showing the U-Boot 1047 version as printed by the "version" command. 1048 Any change to this variable will be reverted at the 1049 next reset. 1050 1051- Real-Time Clock: 1052 1053 When CONFIG_CMD_DATE is selected, the type of the RTC 1054 has to be selected, too. Define exactly one of the 1055 following options: 1056 1057 CONFIG_RTC_MPC8xx - use internal RTC of MPC8xx 1058 CONFIG_RTC_PCF8563 - use Philips PCF8563 RTC 1059 CONFIG_RTC_MC13XXX - use MC13783 or MC13892 RTC 1060 CONFIG_RTC_MC146818 - use MC146818 RTC 1061 CONFIG_RTC_DS1307 - use Maxim, Inc. DS1307 RTC 1062 CONFIG_RTC_DS1337 - use Maxim, Inc. DS1337 RTC 1063 CONFIG_RTC_DS1338 - use Maxim, Inc. DS1338 RTC 1064 CONFIG_RTC_DS1339 - use Maxim, Inc. DS1339 RTC 1065 CONFIG_RTC_DS164x - use Dallas DS164x RTC 1066 CONFIG_RTC_ISL1208 - use Intersil ISL1208 RTC 1067 CONFIG_RTC_MAX6900 - use Maxim, Inc. MAX6900 RTC 1068 CONFIG_SYS_RTC_DS1337_NOOSC - Turn off the OSC output for DS1337 1069 CONFIG_SYS_RV3029_TCR - enable trickle charger on 1070 RV3029 RTC. 1071 1072 Note that if the RTC uses I2C, then the I2C interface 1073 must also be configured. See I2C Support, below. 1074 1075- GPIO Support: 1076 CONFIG_PCA953X - use NXP's PCA953X series I2C GPIO 1077 1078 The CONFIG_SYS_I2C_PCA953X_WIDTH option specifies a list of 1079 chip-ngpio pairs that tell the PCA953X driver the number of 1080 pins supported by a particular chip. 1081 1082 Note that if the GPIO device uses I2C, then the I2C interface 1083 must also be configured. See I2C Support, below. 1084 1085- I/O tracing: 1086 When CONFIG_IO_TRACE is selected, U-Boot intercepts all I/O 1087 accesses and can checksum them or write a list of them out 1088 to memory. See the 'iotrace' command for details. This is 1089 useful for testing device drivers since it can confirm that 1090 the driver behaves the same way before and after a code 1091 change. Currently this is supported on sandbox and arm. To 1092 add support for your architecture, add '#include <iotrace.h>' 1093 to the bottom of arch/<arch>/include/asm/io.h and test. 1094 1095 Example output from the 'iotrace stats' command is below. 1096 Note that if the trace buffer is exhausted, the checksum will 1097 still continue to operate. 1098 1099 iotrace is enabled 1100 Start: 10000000 (buffer start address) 1101 Size: 00010000 (buffer size) 1102 Offset: 00000120 (current buffer offset) 1103 Output: 10000120 (start + offset) 1104 Count: 00000018 (number of trace records) 1105 CRC32: 9526fb66 (CRC32 of all trace records) 1106 1107- Timestamp Support: 1108 1109 When CONFIG_TIMESTAMP is selected, the timestamp 1110 (date and time) of an image is printed by image 1111 commands like bootm or iminfo. This option is 1112 automatically enabled when you select CONFIG_CMD_DATE . 1113 1114- Partition Labels (disklabels) Supported: 1115 Zero or more of the following: 1116 CONFIG_MAC_PARTITION Apple's MacOS partition table. 1117 CONFIG_DOS_PARTITION MS Dos partition table, traditional on the 1118 Intel architecture, USB sticks, etc. 1119 CONFIG_ISO_PARTITION ISO partition table, used on CDROM etc. 1120 CONFIG_EFI_PARTITION GPT partition table, common when EFI is the 1121 bootloader. Note 2TB partition limit; see 1122 disk/part_efi.c 1123 CONFIG_MTD_PARTITIONS Memory Technology Device partition table. 1124 1125 If IDE or SCSI support is enabled (CONFIG_CMD_IDE or 1126 CONFIG_SCSI) you must configure support for at 1127 least one non-MTD partition type as well. 1128 1129- IDE Reset method: 1130 CONFIG_IDE_RESET_ROUTINE - this is defined in several 1131 board configurations files but used nowhere! 1132 1133 CONFIG_IDE_RESET - is this is defined, IDE Reset will 1134 be performed by calling the function 1135 ide_set_reset(int reset) 1136 which has to be defined in a board specific file 1137 1138- ATAPI Support: 1139 CONFIG_ATAPI 1140 1141 Set this to enable ATAPI support. 1142 1143- LBA48 Support 1144 CONFIG_LBA48 1145 1146 Set this to enable support for disks larger than 137GB 1147 Also look at CONFIG_SYS_64BIT_LBA. 1148 Whithout these , LBA48 support uses 32bit variables and will 'only' 1149 support disks up to 2.1TB. 1150 1151 CONFIG_SYS_64BIT_LBA: 1152 When enabled, makes the IDE subsystem use 64bit sector addresses. 1153 Default is 32bit. 1154 1155- SCSI Support: 1156 At the moment only there is only support for the 1157 SYM53C8XX SCSI controller; define 1158 CONFIG_SCSI_SYM53C8XX to enable it. 1159 1160 CONFIG_SYS_SCSI_MAX_LUN [8], CONFIG_SYS_SCSI_MAX_SCSI_ID [7] and 1161 CONFIG_SYS_SCSI_MAX_DEVICE [CONFIG_SYS_SCSI_MAX_SCSI_ID * 1162 CONFIG_SYS_SCSI_MAX_LUN] can be adjusted to define the 1163 maximum numbers of LUNs, SCSI ID's and target 1164 devices. 1165 CONFIG_SYS_SCSI_SYM53C8XX_CCF to fix clock timing (80Mhz) 1166 1167 The environment variable 'scsidevs' is set to the number of 1168 SCSI devices found during the last scan. 1169 1170- NETWORK Support (PCI): 1171 CONFIG_E1000 1172 Support for Intel 8254x/8257x gigabit chips. 1173 1174 CONFIG_E1000_SPI 1175 Utility code for direct access to the SPI bus on Intel 8257x. 1176 This does not do anything useful unless you set at least one 1177 of CONFIG_CMD_E1000 or CONFIG_E1000_SPI_GENERIC. 1178 1179 CONFIG_E1000_SPI_GENERIC 1180 Allow generic access to the SPI bus on the Intel 8257x, for 1181 example with the "sspi" command. 1182 1183 CONFIG_CMD_E1000 1184 Management command for E1000 devices. When used on devices 1185 with SPI support you can reprogram the EEPROM from U-Boot. 1186 1187 CONFIG_EEPRO100 1188 Support for Intel 82557/82559/82559ER chips. 1189 Optional CONFIG_EEPRO100_SROM_WRITE enables EEPROM 1190 write routine for first time initialisation. 1191 1192 CONFIG_TULIP 1193 Support for Digital 2114x chips. 1194 Optional CONFIG_TULIP_SELECT_MEDIA for board specific 1195 modem chip initialisation (KS8761/QS6611). 1196 1197 CONFIG_NATSEMI 1198 Support for National dp83815 chips. 1199 1200 CONFIG_NS8382X 1201 Support for National dp8382[01] gigabit chips. 1202 1203- NETWORK Support (other): 1204 1205 CONFIG_DRIVER_AT91EMAC 1206 Support for AT91RM9200 EMAC. 1207 1208 CONFIG_RMII 1209 Define this to use reduced MII inteface 1210 1211 CONFIG_DRIVER_AT91EMAC_QUIET 1212 If this defined, the driver is quiet. 1213 The driver doen't show link status messages. 1214 1215 CONFIG_CALXEDA_XGMAC 1216 Support for the Calxeda XGMAC device 1217 1218 CONFIG_LAN91C96 1219 Support for SMSC's LAN91C96 chips. 1220 1221 CONFIG_LAN91C96_USE_32_BIT 1222 Define this to enable 32 bit addressing 1223 1224 CONFIG_SMC91111 1225 Support for SMSC's LAN91C111 chip 1226 1227 CONFIG_SMC91111_BASE 1228 Define this to hold the physical address 1229 of the device (I/O space) 1230 1231 CONFIG_SMC_USE_32_BIT 1232 Define this if data bus is 32 bits 1233 1234 CONFIG_SMC_USE_IOFUNCS 1235 Define this to use i/o functions instead of macros 1236 (some hardware wont work with macros) 1237 1238 CONFIG_DRIVER_TI_EMAC 1239 Support for davinci emac 1240 1241 CONFIG_SYS_DAVINCI_EMAC_PHY_COUNT 1242 Define this if you have more then 3 PHYs. 1243 1244 CONFIG_FTGMAC100 1245 Support for Faraday's FTGMAC100 Gigabit SoC Ethernet 1246 1247 CONFIG_FTGMAC100_EGIGA 1248 Define this to use GE link update with gigabit PHY. 1249 Define this if FTGMAC100 is connected to gigabit PHY. 1250 If your system has 10/100 PHY only, it might not occur 1251 wrong behavior. Because PHY usually return timeout or 1252 useless data when polling gigabit status and gigabit 1253 control registers. This behavior won't affect the 1254 correctnessof 10/100 link speed update. 1255 1256 CONFIG_SMC911X 1257 Support for SMSC's LAN911x and LAN921x chips 1258 1259 CONFIG_SMC911X_BASE 1260 Define this to hold the physical address 1261 of the device (I/O space) 1262 1263 CONFIG_SMC911X_32_BIT 1264 Define this if data bus is 32 bits 1265 1266 CONFIG_SMC911X_16_BIT 1267 Define this if data bus is 16 bits. If your processor 1268 automatically converts one 32 bit word to two 16 bit 1269 words you may also try CONFIG_SMC911X_32_BIT. 1270 1271 CONFIG_SH_ETHER 1272 Support for Renesas on-chip Ethernet controller 1273 1274 CONFIG_SH_ETHER_USE_PORT 1275 Define the number of ports to be used 1276 1277 CONFIG_SH_ETHER_PHY_ADDR 1278 Define the ETH PHY's address 1279 1280 CONFIG_SH_ETHER_CACHE_WRITEBACK 1281 If this option is set, the driver enables cache flush. 1282 1283- PWM Support: 1284 CONFIG_PWM_IMX 1285 Support for PWM module on the imx6. 1286 1287- TPM Support: 1288 CONFIG_TPM 1289 Support TPM devices. 1290 1291 CONFIG_TPM_TIS_INFINEON 1292 Support for Infineon i2c bus TPM devices. Only one device 1293 per system is supported at this time. 1294 1295 CONFIG_TPM_TIS_I2C_BURST_LIMITATION 1296 Define the burst count bytes upper limit 1297 1298 CONFIG_TPM_ST33ZP24 1299 Support for STMicroelectronics TPM devices. Requires DM_TPM support. 1300 1301 CONFIG_TPM_ST33ZP24_I2C 1302 Support for STMicroelectronics ST33ZP24 I2C devices. 1303 Requires TPM_ST33ZP24 and I2C. 1304 1305 CONFIG_TPM_ST33ZP24_SPI 1306 Support for STMicroelectronics ST33ZP24 SPI devices. 1307 Requires TPM_ST33ZP24 and SPI. 1308 1309 CONFIG_TPM_ATMEL_TWI 1310 Support for Atmel TWI TPM device. Requires I2C support. 1311 1312 CONFIG_TPM_TIS_LPC 1313 Support for generic parallel port TPM devices. Only one device 1314 per system is supported at this time. 1315 1316 CONFIG_TPM_TIS_BASE_ADDRESS 1317 Base address where the generic TPM device is mapped 1318 to. Contemporary x86 systems usually map it at 1319 0xfed40000. 1320 1321 CONFIG_CMD_TPM 1322 Add tpm monitor functions. 1323 Requires CONFIG_TPM. If CONFIG_TPM_AUTH_SESSIONS is set, also 1324 provides monitor access to authorized functions. 1325 1326 CONFIG_TPM 1327 Define this to enable the TPM support library which provides 1328 functional interfaces to some TPM commands. 1329 Requires support for a TPM device. 1330 1331 CONFIG_TPM_AUTH_SESSIONS 1332 Define this to enable authorized functions in the TPM library. 1333 Requires CONFIG_TPM and CONFIG_SHA1. 1334 1335- USB Support: 1336 At the moment only the UHCI host controller is 1337 supported (PIP405, MIP405, MPC5200); define 1338 CONFIG_USB_UHCI to enable it. 1339 define CONFIG_USB_KEYBOARD to enable the USB Keyboard 1340 and define CONFIG_USB_STORAGE to enable the USB 1341 storage devices. 1342 Note: 1343 Supported are USB Keyboards and USB Floppy drives 1344 (TEAC FD-05PUB). 1345 MPC5200 USB requires additional defines: 1346 CONFIG_USB_CLOCK 1347 for 528 MHz Clock: 0x0001bbbb 1348 CONFIG_PSC3_USB 1349 for USB on PSC3 1350 CONFIG_USB_CONFIG 1351 for differential drivers: 0x00001000 1352 for single ended drivers: 0x00005000 1353 for differential drivers on PSC3: 0x00000100 1354 for single ended drivers on PSC3: 0x00004100 1355 CONFIG_SYS_USB_EVENT_POLL 1356 May be defined to allow interrupt polling 1357 instead of using asynchronous interrupts 1358 1359 CONFIG_USB_EHCI_TXFIFO_THRESH enables setting of the 1360 txfilltuning field in the EHCI controller on reset. 1361 1362 CONFIG_USB_DWC2_REG_ADDR the physical CPU address of the DWC2 1363 HW module registers. 1364 1365- USB Device: 1366 Define the below if you wish to use the USB console. 1367 Once firmware is rebuilt from a serial console issue the 1368 command "setenv stdin usbtty; setenv stdout usbtty" and 1369 attach your USB cable. The Unix command "dmesg" should print 1370 it has found a new device. The environment variable usbtty 1371 can be set to gserial or cdc_acm to enable your device to 1372 appear to a USB host as a Linux gserial device or a 1373 Common Device Class Abstract Control Model serial device. 1374 If you select usbtty = gserial you should be able to enumerate 1375 a Linux host by 1376 # modprobe usbserial vendor=0xVendorID product=0xProductID 1377 else if using cdc_acm, simply setting the environment 1378 variable usbtty to be cdc_acm should suffice. The following 1379 might be defined in YourBoardName.h 1380 1381 CONFIG_USB_DEVICE 1382 Define this to build a UDC device 1383 1384 CONFIG_USB_TTY 1385 Define this to have a tty type of device available to 1386 talk to the UDC device 1387 1388 CONFIG_USBD_HS 1389 Define this to enable the high speed support for usb 1390 device and usbtty. If this feature is enabled, a routine 1391 int is_usbd_high_speed(void) 1392 also needs to be defined by the driver to dynamically poll 1393 whether the enumeration has succeded at high speed or full 1394 speed. 1395 1396 CONFIG_SYS_CONSOLE_IS_IN_ENV 1397 Define this if you want stdin, stdout &/or stderr to 1398 be set to usbtty. 1399 1400 mpc8xx: 1401 CONFIG_SYS_USB_EXTC_CLK 0xBLAH 1402 Derive USB clock from external clock "blah" 1403 - CONFIG_SYS_USB_EXTC_CLK 0x02 1404 1405 If you have a USB-IF assigned VendorID then you may wish to 1406 define your own vendor specific values either in BoardName.h 1407 or directly in usbd_vendor_info.h. If you don't define 1408 CONFIG_USBD_MANUFACTURER, CONFIG_USBD_PRODUCT_NAME, 1409 CONFIG_USBD_VENDORID and CONFIG_USBD_PRODUCTID, then U-Boot 1410 should pretend to be a Linux device to it's target host. 1411 1412 CONFIG_USBD_MANUFACTURER 1413 Define this string as the name of your company for 1414 - CONFIG_USBD_MANUFACTURER "my company" 1415 1416 CONFIG_USBD_PRODUCT_NAME 1417 Define this string as the name of your product 1418 - CONFIG_USBD_PRODUCT_NAME "acme usb device" 1419 1420 CONFIG_USBD_VENDORID 1421 Define this as your assigned Vendor ID from the USB 1422 Implementors Forum. This *must* be a genuine Vendor ID 1423 to avoid polluting the USB namespace. 1424 - CONFIG_USBD_VENDORID 0xFFFF 1425 1426 CONFIG_USBD_PRODUCTID 1427 Define this as the unique Product ID 1428 for your device 1429 - CONFIG_USBD_PRODUCTID 0xFFFF 1430 1431- ULPI Layer Support: 1432 The ULPI (UTMI Low Pin (count) Interface) PHYs are supported via 1433 the generic ULPI layer. The generic layer accesses the ULPI PHY 1434 via the platform viewport, so you need both the genric layer and 1435 the viewport enabled. Currently only Chipidea/ARC based 1436 viewport is supported. 1437 To enable the ULPI layer support, define CONFIG_USB_ULPI and 1438 CONFIG_USB_ULPI_VIEWPORT in your board configuration file. 1439 If your ULPI phy needs a different reference clock than the 1440 standard 24 MHz then you have to define CONFIG_ULPI_REF_CLK to 1441 the appropriate value in Hz. 1442 1443- MMC Support: 1444 The MMC controller on the Intel PXA is supported. To 1445 enable this define CONFIG_MMC. The MMC can be 1446 accessed from the boot prompt by mapping the device 1447 to physical memory similar to flash. Command line is 1448 enabled with CONFIG_CMD_MMC. The MMC driver also works with 1449 the FAT fs. This is enabled with CONFIG_CMD_FAT. 1450 1451 CONFIG_SH_MMCIF 1452 Support for Renesas on-chip MMCIF controller 1453 1454 CONFIG_SH_MMCIF_ADDR 1455 Define the base address of MMCIF registers 1456 1457 CONFIG_SH_MMCIF_CLK 1458 Define the clock frequency for MMCIF 1459 1460 CONFIG_GENERIC_MMC 1461 Enable the generic MMC driver 1462 1463 CONFIG_SUPPORT_EMMC_BOOT 1464 Enable some additional features of the eMMC boot partitions. 1465 1466 CONFIG_SUPPORT_EMMC_RPMB 1467 Enable the commands for reading, writing and programming the 1468 key for the Replay Protection Memory Block partition in eMMC. 1469 1470- USB Device Firmware Update (DFU) class support: 1471 CONFIG_USB_FUNCTION_DFU 1472 This enables the USB portion of the DFU USB class 1473 1474 CONFIG_CMD_DFU 1475 This enables the command "dfu" which is used to have 1476 U-Boot create a DFU class device via USB. This command 1477 requires that the "dfu_alt_info" environment variable be 1478 set and define the alt settings to expose to the host. 1479 1480 CONFIG_DFU_MMC 1481 This enables support for exposing (e)MMC devices via DFU. 1482 1483 CONFIG_DFU_NAND 1484 This enables support for exposing NAND devices via DFU. 1485 1486 CONFIG_DFU_RAM 1487 This enables support for exposing RAM via DFU. 1488 Note: DFU spec refer to non-volatile memory usage, but 1489 allow usages beyond the scope of spec - here RAM usage, 1490 one that would help mostly the developer. 1491 1492 CONFIG_SYS_DFU_DATA_BUF_SIZE 1493 Dfu transfer uses a buffer before writing data to the 1494 raw storage device. Make the size (in bytes) of this buffer 1495 configurable. The size of this buffer is also configurable 1496 through the "dfu_bufsiz" environment variable. 1497 1498 CONFIG_SYS_DFU_MAX_FILE_SIZE 1499 When updating files rather than the raw storage device, 1500 we use a static buffer to copy the file into and then write 1501 the buffer once we've been given the whole file. Define 1502 this to the maximum filesize (in bytes) for the buffer. 1503 Default is 4 MiB if undefined. 1504 1505 DFU_DEFAULT_POLL_TIMEOUT 1506 Poll timeout [ms], is the timeout a device can send to the 1507 host. The host must wait for this timeout before sending 1508 a subsequent DFU_GET_STATUS request to the device. 1509 1510 DFU_MANIFEST_POLL_TIMEOUT 1511 Poll timeout [ms], which the device sends to the host when 1512 entering dfuMANIFEST state. Host waits this timeout, before 1513 sending again an USB request to the device. 1514 1515- USB Device Android Fastboot support: 1516 CONFIG_USB_FUNCTION_FASTBOOT 1517 This enables the USB part of the fastboot gadget 1518 1519 CONFIG_CMD_FASTBOOT 1520 This enables the command "fastboot" which enables the Android 1521 fastboot mode for the platform's USB device. Fastboot is a USB 1522 protocol for downloading images, flashing and device control 1523 used on Android devices. 1524 See doc/README.android-fastboot for more information. 1525 1526 CONFIG_ANDROID_BOOT_IMAGE 1527 This enables support for booting images which use the Android 1528 image format header. 1529 1530 CONFIG_FASTBOOT_BUF_ADDR 1531 The fastboot protocol requires a large memory buffer for 1532 downloads. Define this to the starting RAM address to use for 1533 downloaded images. 1534 1535 CONFIG_FASTBOOT_BUF_SIZE 1536 The fastboot protocol requires a large memory buffer for 1537 downloads. This buffer should be as large as possible for a 1538 platform. Define this to the size available RAM for fastboot. 1539 1540 CONFIG_FASTBOOT_FLASH 1541 The fastboot protocol includes a "flash" command for writing 1542 the downloaded image to a non-volatile storage device. Define 1543 this to enable the "fastboot flash" command. 1544 1545 CONFIG_FASTBOOT_FLASH_MMC_DEV 1546 The fastboot "flash" command requires additional information 1547 regarding the non-volatile storage device. Define this to 1548 the eMMC device that fastboot should use to store the image. 1549 1550 CONFIG_FASTBOOT_GPT_NAME 1551 The fastboot "flash" command supports writing the downloaded 1552 image to the Protective MBR and the Primary GUID Partition 1553 Table. (Additionally, this downloaded image is post-processed 1554 to generate and write the Backup GUID Partition Table.) 1555 This occurs when the specified "partition name" on the 1556 "fastboot flash" command line matches this value. 1557 The default is "gpt" if undefined. 1558 1559 CONFIG_FASTBOOT_MBR_NAME 1560 The fastboot "flash" command supports writing the downloaded 1561 image to DOS MBR. 1562 This occurs when the "partition name" specified on the 1563 "fastboot flash" command line matches this value. 1564 If not defined the default value "mbr" is used. 1565 1566- Journaling Flash filesystem support: 1567 CONFIG_JFFS2_NAND 1568 Define these for a default partition on a NAND device 1569 1570 CONFIG_SYS_JFFS2_FIRST_SECTOR, 1571 CONFIG_SYS_JFFS2_FIRST_BANK, CONFIG_SYS_JFFS2_NUM_BANKS 1572 Define these for a default partition on a NOR device 1573 1574- FAT(File Allocation Table) filesystem write function support: 1575 CONFIG_FAT_WRITE 1576 1577 Define this to enable support for saving memory data as a 1578 file in FAT formatted partition. 1579 1580 This will also enable the command "fatwrite" enabling the 1581 user to write files to FAT. 1582 1583- CBFS (Coreboot Filesystem) support: 1584 CONFIG_CMD_CBFS 1585 1586 Define this to enable support for reading from a Coreboot 1587 filesystem. Available commands are cbfsinit, cbfsinfo, cbfsls 1588 and cbfsload. 1589 1590- FAT(File Allocation Table) filesystem cluster size: 1591 CONFIG_FS_FAT_MAX_CLUSTSIZE 1592 1593 Define the max cluster size for fat operations else 1594 a default value of 65536 will be defined. 1595 1596- Keyboard Support: 1597 See Kconfig help for available keyboard drivers. 1598 1599 CONFIG_KEYBOARD 1600 1601 Define this to enable a custom keyboard support. 1602 This simply calls drv_keyboard_init() which must be 1603 defined in your board-specific files. This option is deprecated 1604 and is only used by novena. For new boards, use driver model 1605 instead. 1606 1607- Video support: 1608 CONFIG_FSL_DIU_FB 1609 Enable the Freescale DIU video driver. Reference boards for 1610 SOCs that have a DIU should define this macro to enable DIU 1611 support, and should also define these other macros: 1612 1613 CONFIG_SYS_DIU_ADDR 1614 CONFIG_VIDEO 1615 CONFIG_CMD_BMP 1616 CONFIG_CFB_CONSOLE 1617 CONFIG_VIDEO_SW_CURSOR 1618 CONFIG_VGA_AS_SINGLE_DEVICE 1619 CONFIG_VIDEO_LOGO 1620 CONFIG_VIDEO_BMP_LOGO 1621 1622 The DIU driver will look for the 'video-mode' environment 1623 variable, and if defined, enable the DIU as a console during 1624 boot. See the documentation file doc/README.video for a 1625 description of this variable. 1626 1627- LCD Support: CONFIG_LCD 1628 1629 Define this to enable LCD support (for output to LCD 1630 display); also select one of the supported displays 1631 by defining one of these: 1632 1633 CONFIG_ATMEL_LCD: 1634 1635 HITACHI TX09D70VM1CCA, 3.5", 240x320. 1636 1637 CONFIG_NEC_NL6448AC33: 1638 1639 NEC NL6448AC33-18. Active, color, single scan. 1640 1641 CONFIG_NEC_NL6448BC20 1642 1643 NEC NL6448BC20-08. 6.5", 640x480. 1644 Active, color, single scan. 1645 1646 CONFIG_NEC_NL6448BC33_54 1647 1648 NEC NL6448BC33-54. 10.4", 640x480. 1649 Active, color, single scan. 1650 1651 CONFIG_SHARP_16x9 1652 1653 Sharp 320x240. Active, color, single scan. 1654 It isn't 16x9, and I am not sure what it is. 1655 1656 CONFIG_SHARP_LQ64D341 1657 1658 Sharp LQ64D341 display, 640x480. 1659 Active, color, single scan. 1660 1661 CONFIG_HLD1045 1662 1663 HLD1045 display, 640x480. 1664 Active, color, single scan. 1665 1666 CONFIG_OPTREX_BW 1667 1668 Optrex CBL50840-2 NF-FW 99 22 M5 1669 or 1670 Hitachi LMG6912RPFC-00T 1671 or 1672 Hitachi SP14Q002 1673 1674 320x240. Black & white. 1675 1676 Normally display is black on white background; define 1677 CONFIG_SYS_WHITE_ON_BLACK to get it inverted. 1678 1679 CONFIG_LCD_ALIGNMENT 1680 1681 Normally the LCD is page-aligned (typically 4KB). If this is 1682 defined then the LCD will be aligned to this value instead. 1683 For ARM it is sometimes useful to use MMU_SECTION_SIZE 1684 here, since it is cheaper to change data cache settings on 1685 a per-section basis. 1686 1687 1688 CONFIG_LCD_ROTATION 1689 1690 Sometimes, for example if the display is mounted in portrait 1691 mode or even if it's mounted landscape but rotated by 180degree, 1692 we need to rotate our content of the display relative to the 1693 framebuffer, so that user can read the messages which are 1694 printed out. 1695 Once CONFIG_LCD_ROTATION is defined, the lcd_console will be 1696 initialized with a given rotation from "vl_rot" out of 1697 "vidinfo_t" which is provided by the board specific code. 1698 The value for vl_rot is coded as following (matching to 1699 fbcon=rotate:<n> linux-kernel commandline): 1700 0 = no rotation respectively 0 degree 1701 1 = 90 degree rotation 1702 2 = 180 degree rotation 1703 3 = 270 degree rotation 1704 1705 If CONFIG_LCD_ROTATION is not defined, the console will be 1706 initialized with 0degree rotation. 1707 1708 CONFIG_LCD_BMP_RLE8 1709 1710 Support drawing of RLE8-compressed bitmaps on the LCD. 1711 1712 CONFIG_I2C_EDID 1713 1714 Enables an 'i2c edid' command which can read EDID 1715 information over I2C from an attached LCD display. 1716 1717- Splash Screen Support: CONFIG_SPLASH_SCREEN 1718 1719 If this option is set, the environment is checked for 1720 a variable "splashimage". If found, the usual display 1721 of logo, copyright and system information on the LCD 1722 is suppressed and the BMP image at the address 1723 specified in "splashimage" is loaded instead. The 1724 console is redirected to the "nulldev", too. This 1725 allows for a "silent" boot where a splash screen is 1726 loaded very quickly after power-on. 1727 1728 CONFIG_SPLASHIMAGE_GUARD 1729 1730 If this option is set, then U-Boot will prevent the environment 1731 variable "splashimage" from being set to a problematic address 1732 (see doc/README.displaying-bmps). 1733 This option is useful for targets where, due to alignment 1734 restrictions, an improperly aligned BMP image will cause a data 1735 abort. If you think you will not have problems with unaligned 1736 accesses (for example because your toolchain prevents them) 1737 there is no need to set this option. 1738 1739 CONFIG_SPLASH_SCREEN_ALIGN 1740 1741 If this option is set the splash image can be freely positioned 1742 on the screen. Environment variable "splashpos" specifies the 1743 position as "x,y". If a positive number is given it is used as 1744 number of pixel from left/top. If a negative number is given it 1745 is used as number of pixel from right/bottom. You can also 1746 specify 'm' for centering the image. 1747 1748 Example: 1749 setenv splashpos m,m 1750 => image at center of screen 1751 1752 setenv splashpos 30,20 1753 => image at x = 30 and y = 20 1754 1755 setenv splashpos -10,m 1756 => vertically centered image 1757 at x = dspWidth - bmpWidth - 9 1758 1759- Gzip compressed BMP image support: CONFIG_VIDEO_BMP_GZIP 1760 1761 If this option is set, additionally to standard BMP 1762 images, gzipped BMP images can be displayed via the 1763 splashscreen support or the bmp command. 1764 1765- Run length encoded BMP image (RLE8) support: CONFIG_VIDEO_BMP_RLE8 1766 1767 If this option is set, 8-bit RLE compressed BMP images 1768 can be displayed via the splashscreen support or the 1769 bmp command. 1770 1771- Do compressing for memory range: 1772 CONFIG_CMD_ZIP 1773 1774 If this option is set, it would use zlib deflate method 1775 to compress the specified memory at its best effort. 1776 1777- Compression support: 1778 CONFIG_GZIP 1779 1780 Enabled by default to support gzip compressed images. 1781 1782 CONFIG_BZIP2 1783 1784 If this option is set, support for bzip2 compressed 1785 images is included. If not, only uncompressed and gzip 1786 compressed images are supported. 1787 1788 NOTE: the bzip2 algorithm requires a lot of RAM, so 1789 the malloc area (as defined by CONFIG_SYS_MALLOC_LEN) should 1790 be at least 4MB. 1791 1792 CONFIG_LZMA 1793 1794 If this option is set, support for lzma compressed 1795 images is included. 1796 1797 Note: The LZMA algorithm adds between 2 and 4KB of code and it 1798 requires an amount of dynamic memory that is given by the 1799 formula: 1800 1801 (1846 + 768 << (lc + lp)) * sizeof(uint16) 1802 1803 Where lc and lp stand for, respectively, Literal context bits 1804 and Literal pos bits. 1805 1806 This value is upper-bounded by 14MB in the worst case. Anyway, 1807 for a ~4MB large kernel image, we have lc=3 and lp=0 for a 1808 total amount of (1846 + 768 << (3 + 0)) * 2 = ~41KB... that is 1809 a very small buffer. 1810 1811 Use the lzmainfo tool to determinate the lc and lp values and 1812 then calculate the amount of needed dynamic memory (ensuring 1813 the appropriate CONFIG_SYS_MALLOC_LEN value). 1814 1815 CONFIG_LZO 1816 1817 If this option is set, support for LZO compressed images 1818 is included. 1819 1820- MII/PHY support: 1821 CONFIG_PHY_ADDR 1822 1823 The address of PHY on MII bus. 1824 1825 CONFIG_PHY_CLOCK_FREQ (ppc4xx) 1826 1827 The clock frequency of the MII bus 1828 1829 CONFIG_PHY_GIGE 1830 1831 If this option is set, support for speed/duplex 1832 detection of gigabit PHY is included. 1833 1834 CONFIG_PHY_RESET_DELAY 1835 1836 Some PHY like Intel LXT971A need extra delay after 1837 reset before any MII register access is possible. 1838 For such PHY, set this option to the usec delay 1839 required. (minimum 300usec for LXT971A) 1840 1841 CONFIG_PHY_CMD_DELAY (ppc4xx) 1842 1843 Some PHY like Intel LXT971A need extra delay after 1844 command issued before MII status register can be read 1845 1846- IP address: 1847 CONFIG_IPADDR 1848 1849 Define a default value for the IP address to use for 1850 the default Ethernet interface, in case this is not 1851 determined through e.g. bootp. 1852 (Environment variable "ipaddr") 1853 1854- Server IP address: 1855 CONFIG_SERVERIP 1856 1857 Defines a default value for the IP address of a TFTP 1858 server to contact when using the "tftboot" command. 1859 (Environment variable "serverip") 1860 1861 CONFIG_KEEP_SERVERADDR 1862 1863 Keeps the server's MAC address, in the env 'serveraddr' 1864 for passing to bootargs (like Linux's netconsole option) 1865 1866- Gateway IP address: 1867 CONFIG_GATEWAYIP 1868 1869 Defines a default value for the IP address of the 1870 default router where packets to other networks are 1871 sent to. 1872 (Environment variable "gatewayip") 1873 1874- Subnet mask: 1875 CONFIG_NETMASK 1876 1877 Defines a default value for the subnet mask (or 1878 routing prefix) which is used to determine if an IP 1879 address belongs to the local subnet or needs to be 1880 forwarded through a router. 1881 (Environment variable "netmask") 1882 1883- Multicast TFTP Mode: 1884 CONFIG_MCAST_TFTP 1885 1886 Defines whether you want to support multicast TFTP as per 1887 rfc-2090; for example to work with atftp. Lets lots of targets 1888 tftp down the same boot image concurrently. Note: the Ethernet 1889 driver in use must provide a function: mcast() to join/leave a 1890 multicast group. 1891 1892- BOOTP Recovery Mode: 1893 CONFIG_BOOTP_RANDOM_DELAY 1894 1895 If you have many targets in a network that try to 1896 boot using BOOTP, you may want to avoid that all 1897 systems send out BOOTP requests at precisely the same 1898 moment (which would happen for instance at recovery 1899 from a power failure, when all systems will try to 1900 boot, thus flooding the BOOTP server. Defining 1901 CONFIG_BOOTP_RANDOM_DELAY causes a random delay to be 1902 inserted before sending out BOOTP requests. The 1903 following delays are inserted then: 1904 1905 1st BOOTP request: delay 0 ... 1 sec 1906 2nd BOOTP request: delay 0 ... 2 sec 1907 3rd BOOTP request: delay 0 ... 4 sec 1908 4th and following 1909 BOOTP requests: delay 0 ... 8 sec 1910 1911 CONFIG_BOOTP_ID_CACHE_SIZE 1912 1913 BOOTP packets are uniquely identified using a 32-bit ID. The 1914 server will copy the ID from client requests to responses and 1915 U-Boot will use this to determine if it is the destination of 1916 an incoming response. Some servers will check that addresses 1917 aren't in use before handing them out (usually using an ARP 1918 ping) and therefore take up to a few hundred milliseconds to 1919 respond. Network congestion may also influence the time it 1920 takes for a response to make it back to the client. If that 1921 time is too long, U-Boot will retransmit requests. In order 1922 to allow earlier responses to still be accepted after these 1923 retransmissions, U-Boot's BOOTP client keeps a small cache of 1924 IDs. The CONFIG_BOOTP_ID_CACHE_SIZE controls the size of this 1925 cache. The default is to keep IDs for up to four outstanding 1926 requests. Increasing this will allow U-Boot to accept offers 1927 from a BOOTP client in networks with unusually high latency. 1928 1929- DHCP Advanced Options: 1930 You can fine tune the DHCP functionality by defining 1931 CONFIG_BOOTP_* symbols: 1932 1933 CONFIG_BOOTP_SUBNETMASK 1934 CONFIG_BOOTP_GATEWAY 1935 CONFIG_BOOTP_HOSTNAME 1936 CONFIG_BOOTP_NISDOMAIN 1937 CONFIG_BOOTP_BOOTPATH 1938 CONFIG_BOOTP_BOOTFILESIZE 1939 CONFIG_BOOTP_DNS 1940 CONFIG_BOOTP_DNS2 1941 CONFIG_BOOTP_SEND_HOSTNAME 1942 CONFIG_BOOTP_NTPSERVER 1943 CONFIG_BOOTP_TIMEOFFSET 1944 CONFIG_BOOTP_VENDOREX 1945 CONFIG_BOOTP_MAY_FAIL 1946 1947 CONFIG_BOOTP_SERVERIP - TFTP server will be the serverip 1948 environment variable, not the BOOTP server. 1949 1950 CONFIG_BOOTP_MAY_FAIL - If the DHCP server is not found 1951 after the configured retry count, the call will fail 1952 instead of starting over. This can be used to fail over 1953 to Link-local IP address configuration if the DHCP server 1954 is not available. 1955 1956 CONFIG_BOOTP_DNS2 - If a DHCP client requests the DNS 1957 serverip from a DHCP server, it is possible that more 1958 than one DNS serverip is offered to the client. 1959 If CONFIG_BOOTP_DNS2 is enabled, the secondary DNS 1960 serverip will be stored in the additional environment 1961 variable "dnsip2". The first DNS serverip is always 1962 stored in the variable "dnsip", when CONFIG_BOOTP_DNS 1963 is defined. 1964 1965 CONFIG_BOOTP_SEND_HOSTNAME - Some DHCP servers are capable 1966 to do a dynamic update of a DNS server. To do this, they 1967 need the hostname of the DHCP requester. 1968 If CONFIG_BOOTP_SEND_HOSTNAME is defined, the content 1969 of the "hostname" environment variable is passed as 1970 option 12 to the DHCP server. 1971 1972 CONFIG_BOOTP_DHCP_REQUEST_DELAY 1973 1974 A 32bit value in microseconds for a delay between 1975 receiving a "DHCP Offer" and sending the "DHCP Request". 1976 This fixes a problem with certain DHCP servers that don't 1977 respond 100% of the time to a "DHCP request". E.g. On an 1978 AT91RM9200 processor running at 180MHz, this delay needed 1979 to be *at least* 15,000 usec before a Windows Server 2003 1980 DHCP server would reply 100% of the time. I recommend at 1981 least 50,000 usec to be safe. The alternative is to hope 1982 that one of the retries will be successful but note that 1983 the DHCP timeout and retry process takes a longer than 1984 this delay. 1985 1986 - Link-local IP address negotiation: 1987 Negotiate with other link-local clients on the local network 1988 for an address that doesn't require explicit configuration. 1989 This is especially useful if a DHCP server cannot be guaranteed 1990 to exist in all environments that the device must operate. 1991 1992 See doc/README.link-local for more information. 1993 1994 - CDP Options: 1995 CONFIG_CDP_DEVICE_ID 1996 1997 The device id used in CDP trigger frames. 1998 1999 CONFIG_CDP_DEVICE_ID_PREFIX 2000 2001 A two character string which is prefixed to the MAC address 2002 of the device. 2003 2004 CONFIG_CDP_PORT_ID 2005 2006 A printf format string which contains the ascii name of 2007 the port. Normally is set to "eth%d" which sets 2008 eth0 for the first Ethernet, eth1 for the second etc. 2009 2010 CONFIG_CDP_CAPABILITIES 2011 2012 A 32bit integer which indicates the device capabilities; 2013 0x00000010 for a normal host which does not forwards. 2014 2015 CONFIG_CDP_VERSION 2016 2017 An ascii string containing the version of the software. 2018 2019 CONFIG_CDP_PLATFORM 2020 2021 An ascii string containing the name of the platform. 2022 2023 CONFIG_CDP_TRIGGER 2024 2025 A 32bit integer sent on the trigger. 2026 2027 CONFIG_CDP_POWER_CONSUMPTION 2028 2029 A 16bit integer containing the power consumption of the 2030 device in .1 of milliwatts. 2031 2032 CONFIG_CDP_APPLIANCE_VLAN_TYPE 2033 2034 A byte containing the id of the VLAN. 2035 2036- Status LED: CONFIG_LED_STATUS 2037 2038 Several configurations allow to display the current 2039 status using a LED. For instance, the LED will blink 2040 fast while running U-Boot code, stop blinking as 2041 soon as a reply to a BOOTP request was received, and 2042 start blinking slow once the Linux kernel is running 2043 (supported by a status LED driver in the Linux 2044 kernel). Defining CONFIG_LED_STATUS enables this 2045 feature in U-Boot. 2046 2047 Additional options: 2048 2049 CONFIG_LED_STATUS_GPIO 2050 The status LED can be connected to a GPIO pin. 2051 In such cases, the gpio_led driver can be used as a 2052 status LED backend implementation. Define CONFIG_LED_STATUS_GPIO 2053 to include the gpio_led driver in the U-Boot binary. 2054 2055 CONFIG_GPIO_LED_INVERTED_TABLE 2056 Some GPIO connected LEDs may have inverted polarity in which 2057 case the GPIO high value corresponds to LED off state and 2058 GPIO low value corresponds to LED on state. 2059 In such cases CONFIG_GPIO_LED_INVERTED_TABLE may be defined 2060 with a list of GPIO LEDs that have inverted polarity. 2061 2062- CAN Support: CONFIG_CAN_DRIVER 2063 2064 Defining CONFIG_CAN_DRIVER enables CAN driver support 2065 on those systems that support this (optional) 2066 feature, like the TQM8xxL modules. 2067 2068- I2C Support: CONFIG_SYS_I2C 2069 2070 This enable the NEW i2c subsystem, and will allow you to use 2071 i2c commands at the u-boot command line (as long as you set 2072 CONFIG_CMD_I2C in CONFIG_COMMANDS) and communicate with i2c 2073 based realtime clock chips or other i2c devices. See 2074 common/cmd_i2c.c for a description of the command line 2075 interface. 2076 2077 ported i2c driver to the new framework: 2078 - drivers/i2c/soft_i2c.c: 2079 - activate first bus with CONFIG_SYS_I2C_SOFT define 2080 CONFIG_SYS_I2C_SOFT_SPEED and CONFIG_SYS_I2C_SOFT_SLAVE 2081 for defining speed and slave address 2082 - activate second bus with I2C_SOFT_DECLARATIONS2 define 2083 CONFIG_SYS_I2C_SOFT_SPEED_2 and CONFIG_SYS_I2C_SOFT_SLAVE_2 2084 for defining speed and slave address 2085 - activate third bus with I2C_SOFT_DECLARATIONS3 define 2086 CONFIG_SYS_I2C_SOFT_SPEED_3 and CONFIG_SYS_I2C_SOFT_SLAVE_3 2087 for defining speed and slave address 2088 - activate fourth bus with I2C_SOFT_DECLARATIONS4 define 2089 CONFIG_SYS_I2C_SOFT_SPEED_4 and CONFIG_SYS_I2C_SOFT_SLAVE_4 2090 for defining speed and slave address 2091 2092 - drivers/i2c/fsl_i2c.c: 2093 - activate i2c driver with CONFIG_SYS_I2C_FSL 2094 define CONFIG_SYS_FSL_I2C_OFFSET for setting the register 2095 offset CONFIG_SYS_FSL_I2C_SPEED for the i2c speed and 2096 CONFIG_SYS_FSL_I2C_SLAVE for the slave addr of the first 2097 bus. 2098 - If your board supports a second fsl i2c bus, define 2099 CONFIG_SYS_FSL_I2C2_OFFSET for the register offset 2100 CONFIG_SYS_FSL_I2C2_SPEED for the speed and 2101 CONFIG_SYS_FSL_I2C2_SLAVE for the slave address of the 2102 second bus. 2103 2104 - drivers/i2c/tegra_i2c.c: 2105 - activate this driver with CONFIG_SYS_I2C_TEGRA 2106 - This driver adds 4 i2c buses with a fix speed from 2107 100000 and the slave addr 0! 2108 2109 - drivers/i2c/ppc4xx_i2c.c 2110 - activate this driver with CONFIG_SYS_I2C_PPC4XX 2111 - CONFIG_SYS_I2C_PPC4XX_CH0 activate hardware channel 0 2112 - CONFIG_SYS_I2C_PPC4XX_CH1 activate hardware channel 1 2113 2114 - drivers/i2c/i2c_mxc.c 2115 - activate this driver with CONFIG_SYS_I2C_MXC 2116 - enable bus 1 with CONFIG_SYS_I2C_MXC_I2C1 2117 - enable bus 2 with CONFIG_SYS_I2C_MXC_I2C2 2118 - enable bus 3 with CONFIG_SYS_I2C_MXC_I2C3 2119 - enable bus 4 with CONFIG_SYS_I2C_MXC_I2C4 2120 - define speed for bus 1 with CONFIG_SYS_MXC_I2C1_SPEED 2121 - define slave for bus 1 with CONFIG_SYS_MXC_I2C1_SLAVE 2122 - define speed for bus 2 with CONFIG_SYS_MXC_I2C2_SPEED 2123 - define slave for bus 2 with CONFIG_SYS_MXC_I2C2_SLAVE 2124 - define speed for bus 3 with CONFIG_SYS_MXC_I2C3_SPEED 2125 - define slave for bus 3 with CONFIG_SYS_MXC_I2C3_SLAVE 2126 - define speed for bus 4 with CONFIG_SYS_MXC_I2C4_SPEED 2127 - define slave for bus 4 with CONFIG_SYS_MXC_I2C4_SLAVE 2128 If those defines are not set, default value is 100000 2129 for speed, and 0 for slave. 2130 2131 - drivers/i2c/rcar_i2c.c: 2132 - activate this driver with CONFIG_SYS_I2C_RCAR 2133 - This driver adds 4 i2c buses 2134 2135 - CONFIG_SYS_RCAR_I2C0_BASE for setting the register channel 0 2136 - CONFIG_SYS_RCAR_I2C0_SPEED for for the speed channel 0 2137 - CONFIG_SYS_RCAR_I2C1_BASE for setting the register channel 1 2138 - CONFIG_SYS_RCAR_I2C1_SPEED for for the speed channel 1 2139 - CONFIG_SYS_RCAR_I2C2_BASE for setting the register channel 2 2140 - CONFIG_SYS_RCAR_I2C2_SPEED for for the speed channel 2 2141 - CONFIG_SYS_RCAR_I2C3_BASE for setting the register channel 3 2142 - CONFIG_SYS_RCAR_I2C3_SPEED for for the speed channel 3 2143 - CONFIF_SYS_RCAR_I2C_NUM_CONTROLLERS for number of i2c buses 2144 2145 - drivers/i2c/sh_i2c.c: 2146 - activate this driver with CONFIG_SYS_I2C_SH 2147 - This driver adds from 2 to 5 i2c buses 2148 2149 - CONFIG_SYS_I2C_SH_BASE0 for setting the register channel 0 2150 - CONFIG_SYS_I2C_SH_SPEED0 for for the speed channel 0 2151 - CONFIG_SYS_I2C_SH_BASE1 for setting the register channel 1 2152 - CONFIG_SYS_I2C_SH_SPEED1 for for the speed channel 1 2153 - CONFIG_SYS_I2C_SH_BASE2 for setting the register channel 2 2154 - CONFIG_SYS_I2C_SH_SPEED2 for for the speed channel 2 2155 - CONFIG_SYS_I2C_SH_BASE3 for setting the register channel 3 2156 - CONFIG_SYS_I2C_SH_SPEED3 for for the speed channel 3 2157 - CONFIG_SYS_I2C_SH_BASE4 for setting the register channel 4 2158 - CONFIG_SYS_I2C_SH_SPEED4 for for the speed channel 4 2159 - CONFIG_SYS_I2C_SH_NUM_CONTROLLERS for number of i2c buses 2160 2161 - drivers/i2c/omap24xx_i2c.c 2162 - activate this driver with CONFIG_SYS_I2C_OMAP24XX 2163 - CONFIG_SYS_OMAP24_I2C_SPEED speed channel 0 2164 - CONFIG_SYS_OMAP24_I2C_SLAVE slave addr channel 0 2165 - CONFIG_SYS_OMAP24_I2C_SPEED1 speed channel 1 2166 - CONFIG_SYS_OMAP24_I2C_SLAVE1 slave addr channel 1 2167 - CONFIG_SYS_OMAP24_I2C_SPEED2 speed channel 2 2168 - CONFIG_SYS_OMAP24_I2C_SLAVE2 slave addr channel 2 2169 - CONFIG_SYS_OMAP24_I2C_SPEED3 speed channel 3 2170 - CONFIG_SYS_OMAP24_I2C_SLAVE3 slave addr channel 3 2171 - CONFIG_SYS_OMAP24_I2C_SPEED4 speed channel 4 2172 - CONFIG_SYS_OMAP24_I2C_SLAVE4 slave addr channel 4 2173 2174 - drivers/i2c/zynq_i2c.c 2175 - activate this driver with CONFIG_SYS_I2C_ZYNQ 2176 - set CONFIG_SYS_I2C_ZYNQ_SPEED for speed setting 2177 - set CONFIG_SYS_I2C_ZYNQ_SLAVE for slave addr 2178 2179 - drivers/i2c/s3c24x0_i2c.c: 2180 - activate this driver with CONFIG_SYS_I2C_S3C24X0 2181 - This driver adds i2c buses (11 for Exynos5250, Exynos5420 2182 9 i2c buses for Exynos4 and 1 for S3C24X0 SoCs from Samsung) 2183 with a fix speed from 100000 and the slave addr 0! 2184 2185 - drivers/i2c/ihs_i2c.c 2186 - activate this driver with CONFIG_SYS_I2C_IHS 2187 - CONFIG_SYS_I2C_IHS_CH0 activate hardware channel 0 2188 - CONFIG_SYS_I2C_IHS_SPEED_0 speed channel 0 2189 - CONFIG_SYS_I2C_IHS_SLAVE_0 slave addr channel 0 2190 - CONFIG_SYS_I2C_IHS_CH1 activate hardware channel 1 2191 - CONFIG_SYS_I2C_IHS_SPEED_1 speed channel 1 2192 - CONFIG_SYS_I2C_IHS_SLAVE_1 slave addr channel 1 2193 - CONFIG_SYS_I2C_IHS_CH2 activate hardware channel 2 2194 - CONFIG_SYS_I2C_IHS_SPEED_2 speed channel 2 2195 - CONFIG_SYS_I2C_IHS_SLAVE_2 slave addr channel 2 2196 - CONFIG_SYS_I2C_IHS_CH3 activate hardware channel 3 2197 - CONFIG_SYS_I2C_IHS_SPEED_3 speed channel 3 2198 - CONFIG_SYS_I2C_IHS_SLAVE_3 slave addr channel 3 2199 - activate dual channel with CONFIG_SYS_I2C_IHS_DUAL 2200 - CONFIG_SYS_I2C_IHS_SPEED_0_1 speed channel 0_1 2201 - CONFIG_SYS_I2C_IHS_SLAVE_0_1 slave addr channel 0_1 2202 - CONFIG_SYS_I2C_IHS_SPEED_1_1 speed channel 1_1 2203 - CONFIG_SYS_I2C_IHS_SLAVE_1_1 slave addr channel 1_1 2204 - CONFIG_SYS_I2C_IHS_SPEED_2_1 speed channel 2_1 2205 - CONFIG_SYS_I2C_IHS_SLAVE_2_1 slave addr channel 2_1 2206 - CONFIG_SYS_I2C_IHS_SPEED_3_1 speed channel 3_1 2207 - CONFIG_SYS_I2C_IHS_SLAVE_3_1 slave addr channel 3_1 2208 2209 additional defines: 2210 2211 CONFIG_SYS_NUM_I2C_BUSES 2212 Hold the number of i2c buses you want to use. 2213 2214 CONFIG_SYS_I2C_DIRECT_BUS 2215 define this, if you don't use i2c muxes on your hardware. 2216 if CONFIG_SYS_I2C_MAX_HOPS is not defined or == 0 you can 2217 omit this define. 2218 2219 CONFIG_SYS_I2C_MAX_HOPS 2220 define how many muxes are maximal consecutively connected 2221 on one i2c bus. If you not use i2c muxes, omit this 2222 define. 2223 2224 CONFIG_SYS_I2C_BUSES 2225 hold a list of buses you want to use, only used if 2226 CONFIG_SYS_I2C_DIRECT_BUS is not defined, for example 2227 a board with CONFIG_SYS_I2C_MAX_HOPS = 1 and 2228 CONFIG_SYS_NUM_I2C_BUSES = 9: 2229 2230 CONFIG_SYS_I2C_BUSES {{0, {I2C_NULL_HOP}}, \ 2231 {0, {{I2C_MUX_PCA9547, 0x70, 1}}}, \ 2232 {0, {{I2C_MUX_PCA9547, 0x70, 2}}}, \ 2233 {0, {{I2C_MUX_PCA9547, 0x70, 3}}}, \ 2234 {0, {{I2C_MUX_PCA9547, 0x70, 4}}}, \ 2235 {0, {{I2C_MUX_PCA9547, 0x70, 5}}}, \ 2236 {1, {I2C_NULL_HOP}}, \ 2237 {1, {{I2C_MUX_PCA9544, 0x72, 1}}}, \ 2238 {1, {{I2C_MUX_PCA9544, 0x72, 2}}}, \ 2239 } 2240 2241 which defines 2242 bus 0 on adapter 0 without a mux 2243 bus 1 on adapter 0 with a PCA9547 on address 0x70 port 1 2244 bus 2 on adapter 0 with a PCA9547 on address 0x70 port 2 2245 bus 3 on adapter 0 with a PCA9547 on address 0x70 port 3 2246 bus 4 on adapter 0 with a PCA9547 on address 0x70 port 4 2247 bus 5 on adapter 0 with a PCA9547 on address 0x70 port 5 2248 bus 6 on adapter 1 without a mux 2249 bus 7 on adapter 1 with a PCA9544 on address 0x72 port 1 2250 bus 8 on adapter 1 with a PCA9544 on address 0x72 port 2 2251 2252 If you do not have i2c muxes on your board, omit this define. 2253 2254- Legacy I2C Support: CONFIG_HARD_I2C 2255 2256 NOTE: It is intended to move drivers to CONFIG_SYS_I2C which 2257 provides the following compelling advantages: 2258 2259 - more than one i2c adapter is usable 2260 - approved multibus support 2261 - better i2c mux support 2262 2263 ** Please consider updating your I2C driver now. ** 2264 2265 These enable legacy I2C serial bus commands. Defining 2266 CONFIG_HARD_I2C will include the appropriate I2C driver 2267 for the selected CPU. 2268 2269 This will allow you to use i2c commands at the u-boot 2270 command line (as long as you set CONFIG_CMD_I2C in 2271 CONFIG_COMMANDS) and communicate with i2c based realtime 2272 clock chips. See common/cmd_i2c.c for a description of the 2273 command line interface. 2274 2275 CONFIG_HARD_I2C selects a hardware I2C controller. 2276 2277 There are several other quantities that must also be 2278 defined when you define CONFIG_HARD_I2C. 2279 2280 In both cases you will need to define CONFIG_SYS_I2C_SPEED 2281 to be the frequency (in Hz) at which you wish your i2c bus 2282 to run and CONFIG_SYS_I2C_SLAVE to be the address of this node (ie 2283 the CPU's i2c node address). 2284 2285 Now, the u-boot i2c code for the mpc8xx 2286 (arch/powerpc/cpu/mpc8xx/i2c.c) sets the CPU up as a master node 2287 and so its address should therefore be cleared to 0 (See, 2288 eg, MPC823e User's Manual p.16-473). So, set 2289 CONFIG_SYS_I2C_SLAVE to 0. 2290 2291 CONFIG_SYS_I2C_INIT_MPC5XXX 2292 2293 When a board is reset during an i2c bus transfer 2294 chips might think that the current transfer is still 2295 in progress. Reset the slave devices by sending start 2296 commands until the slave device responds. 2297 2298 That's all that's required for CONFIG_HARD_I2C. 2299 2300 If you use the software i2c interface (CONFIG_SYS_I2C_SOFT) 2301 then the following macros need to be defined (examples are 2302 from include/configs/lwmon.h): 2303 2304 I2C_INIT 2305 2306 (Optional). Any commands necessary to enable the I2C 2307 controller or configure ports. 2308 2309 eg: #define I2C_INIT (immr->im_cpm.cp_pbdir |= PB_SCL) 2310 2311 I2C_PORT 2312 2313 (Only for MPC8260 CPU). The I/O port to use (the code 2314 assumes both bits are on the same port). Valid values 2315 are 0..3 for ports A..D. 2316 2317 I2C_ACTIVE 2318 2319 The code necessary to make the I2C data line active 2320 (driven). If the data line is open collector, this 2321 define can be null. 2322 2323 eg: #define I2C_ACTIVE (immr->im_cpm.cp_pbdir |= PB_SDA) 2324 2325 I2C_TRISTATE 2326 2327 The code necessary to make the I2C data line tri-stated 2328 (inactive). If the data line is open collector, this 2329 define can be null. 2330 2331 eg: #define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA) 2332 2333 I2C_READ 2334 2335 Code that returns true if the I2C data line is high, 2336 false if it is low. 2337 2338 eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0) 2339 2340 I2C_SDA(bit) 2341 2342 If <bit> is true, sets the I2C data line high. If it 2343 is false, it clears it (low). 2344 2345 eg: #define I2C_SDA(bit) \ 2346 if(bit) immr->im_cpm.cp_pbdat |= PB_SDA; \ 2347 else immr->im_cpm.cp_pbdat &= ~PB_SDA 2348 2349 I2C_SCL(bit) 2350 2351 If <bit> is true, sets the I2C clock line high. If it 2352 is false, it clears it (low). 2353 2354 eg: #define I2C_SCL(bit) \ 2355 if(bit) immr->im_cpm.cp_pbdat |= PB_SCL; \ 2356 else immr->im_cpm.cp_pbdat &= ~PB_SCL 2357 2358 I2C_DELAY 2359 2360 This delay is invoked four times per clock cycle so this 2361 controls the rate of data transfer. The data rate thus 2362 is 1 / (I2C_DELAY * 4). Often defined to be something 2363 like: 2364 2365 #define I2C_DELAY udelay(2) 2366 2367 CONFIG_SOFT_I2C_GPIO_SCL / CONFIG_SOFT_I2C_GPIO_SDA 2368 2369 If your arch supports the generic GPIO framework (asm/gpio.h), 2370 then you may alternatively define the two GPIOs that are to be 2371 used as SCL / SDA. Any of the previous I2C_xxx macros will 2372 have GPIO-based defaults assigned to them as appropriate. 2373 2374 You should define these to the GPIO value as given directly to 2375 the generic GPIO functions. 2376 2377 CONFIG_SYS_I2C_INIT_BOARD 2378 2379 When a board is reset during an i2c bus transfer 2380 chips might think that the current transfer is still 2381 in progress. On some boards it is possible to access 2382 the i2c SCLK line directly, either by using the 2383 processor pin as a GPIO or by having a second pin 2384 connected to the bus. If this option is defined a 2385 custom i2c_init_board() routine in boards/xxx/board.c 2386 is run early in the boot sequence. 2387 2388 CONFIG_SYS_I2C_BOARD_LATE_INIT 2389 2390 An alternative to CONFIG_SYS_I2C_INIT_BOARD. If this option is 2391 defined a custom i2c_board_late_init() routine in 2392 boards/xxx/board.c is run AFTER the operations in i2c_init() 2393 is completed. This callpoint can be used to unreset i2c bus 2394 using CPU i2c controller register accesses for CPUs whose i2c 2395 controller provide such a method. It is called at the end of 2396 i2c_init() to allow i2c_init operations to setup the i2c bus 2397 controller on the CPU (e.g. setting bus speed & slave address). 2398 2399 CONFIG_I2CFAST (PPC405GP|PPC405EP only) 2400 2401 This option enables configuration of bi_iic_fast[] flags 2402 in u-boot bd_info structure based on u-boot environment 2403 variable "i2cfast". (see also i2cfast) 2404 2405 CONFIG_I2C_MULTI_BUS 2406 2407 This option allows the use of multiple I2C buses, each of which 2408 must have a controller. At any point in time, only one bus is 2409 active. To switch to a different bus, use the 'i2c dev' command. 2410 Note that bus numbering is zero-based. 2411 2412 CONFIG_SYS_I2C_NOPROBES 2413 2414 This option specifies a list of I2C devices that will be skipped 2415 when the 'i2c probe' command is issued. If CONFIG_I2C_MULTI_BUS 2416 is set, specify a list of bus-device pairs. Otherwise, specify 2417 a 1D array of device addresses 2418 2419 e.g. 2420 #undef CONFIG_I2C_MULTI_BUS 2421 #define CONFIG_SYS_I2C_NOPROBES {0x50,0x68} 2422 2423 will skip addresses 0x50 and 0x68 on a board with one I2C bus 2424 2425 #define CONFIG_I2C_MULTI_BUS 2426 #define CONFIG_SYS_I2C_NOPROBES {{0,0x50},{0,0x68},{1,0x54}} 2427 2428 will skip addresses 0x50 and 0x68 on bus 0 and address 0x54 on bus 1 2429 2430 CONFIG_SYS_SPD_BUS_NUM 2431 2432 If defined, then this indicates the I2C bus number for DDR SPD. 2433 If not defined, then U-Boot assumes that SPD is on I2C bus 0. 2434 2435 CONFIG_SYS_RTC_BUS_NUM 2436 2437 If defined, then this indicates the I2C bus number for the RTC. 2438 If not defined, then U-Boot assumes that RTC is on I2C bus 0. 2439 2440 CONFIG_SYS_DTT_BUS_NUM 2441 2442 If defined, then this indicates the I2C bus number for the DTT. 2443 If not defined, then U-Boot assumes that DTT is on I2C bus 0. 2444 2445 CONFIG_SYS_I2C_DTT_ADDR: 2446 2447 If defined, specifies the I2C address of the DTT device. 2448 If not defined, then U-Boot uses predefined value for 2449 specified DTT device. 2450 2451 CONFIG_SOFT_I2C_READ_REPEATED_START 2452 2453 defining this will force the i2c_read() function in 2454 the soft_i2c driver to perform an I2C repeated start 2455 between writing the address pointer and reading the 2456 data. If this define is omitted the default behaviour 2457 of doing a stop-start sequence will be used. Most I2C 2458 devices can use either method, but some require one or 2459 the other. 2460 2461- SPI Support: CONFIG_SPI 2462 2463 Enables SPI driver (so far only tested with 2464 SPI EEPROM, also an instance works with Crystal A/D and 2465 D/As on the SACSng board) 2466 2467 CONFIG_SH_SPI 2468 2469 Enables the driver for SPI controller on SuperH. Currently 2470 only SH7757 is supported. 2471 2472 CONFIG_SOFT_SPI 2473 2474 Enables a software (bit-bang) SPI driver rather than 2475 using hardware support. This is a general purpose 2476 driver that only requires three general I/O port pins 2477 (two outputs, one input) to function. If this is 2478 defined, the board configuration must define several 2479 SPI configuration items (port pins to use, etc). For 2480 an example, see include/configs/sacsng.h. 2481 2482 CONFIG_HARD_SPI 2483 2484 Enables a hardware SPI driver for general-purpose reads 2485 and writes. As with CONFIG_SOFT_SPI, the board configuration 2486 must define a list of chip-select function pointers. 2487 Currently supported on some MPC8xxx processors. For an 2488 example, see include/configs/mpc8349emds.h. 2489 2490 CONFIG_MXC_SPI 2491 2492 Enables the driver for the SPI controllers on i.MX and MXC 2493 SoCs. Currently i.MX31/35/51 are supported. 2494 2495 CONFIG_SYS_SPI_MXC_WAIT 2496 Timeout for waiting until spi transfer completed. 2497 default: (CONFIG_SYS_HZ/100) /* 10 ms */ 2498 2499- FPGA Support: CONFIG_FPGA 2500 2501 Enables FPGA subsystem. 2502 2503 CONFIG_FPGA_<vendor> 2504 2505 Enables support for specific chip vendors. 2506 (ALTERA, XILINX) 2507 2508 CONFIG_FPGA_<family> 2509 2510 Enables support for FPGA family. 2511 (SPARTAN2, SPARTAN3, VIRTEX2, CYCLONE2, ACEX1K, ACEX) 2512 2513 CONFIG_FPGA_COUNT 2514 2515 Specify the number of FPGA devices to support. 2516 2517 CONFIG_CMD_FPGA_LOADMK 2518 2519 Enable support for fpga loadmk command 2520 2521 CONFIG_CMD_FPGA_LOADP 2522 2523 Enable support for fpga loadp command - load partial bitstream 2524 2525 CONFIG_CMD_FPGA_LOADBP 2526 2527 Enable support for fpga loadbp command - load partial bitstream 2528 (Xilinx only) 2529 2530 CONFIG_SYS_FPGA_PROG_FEEDBACK 2531 2532 Enable printing of hash marks during FPGA configuration. 2533 2534 CONFIG_SYS_FPGA_CHECK_BUSY 2535 2536 Enable checks on FPGA configuration interface busy 2537 status by the configuration function. This option 2538 will require a board or device specific function to 2539 be written. 2540 2541 CONFIG_FPGA_DELAY 2542 2543 If defined, a function that provides delays in the FPGA 2544 configuration driver. 2545 2546 CONFIG_SYS_FPGA_CHECK_CTRLC 2547 Allow Control-C to interrupt FPGA configuration 2548 2549 CONFIG_SYS_FPGA_CHECK_ERROR 2550 2551 Check for configuration errors during FPGA bitfile 2552 loading. For example, abort during Virtex II 2553 configuration if the INIT_B line goes low (which 2554 indicated a CRC error). 2555 2556 CONFIG_SYS_FPGA_WAIT_INIT 2557 2558 Maximum time to wait for the INIT_B line to de-assert 2559 after PROB_B has been de-asserted during a Virtex II 2560 FPGA configuration sequence. The default time is 500 2561 ms. 2562 2563 CONFIG_SYS_FPGA_WAIT_BUSY 2564 2565 Maximum time to wait for BUSY to de-assert during 2566 Virtex II FPGA configuration. The default is 5 ms. 2567 2568 CONFIG_SYS_FPGA_WAIT_CONFIG 2569 2570 Time to wait after FPGA configuration. The default is 2571 200 ms. 2572 2573- Configuration Management: 2574 CONFIG_BUILD_TARGET 2575 2576 Some SoCs need special image types (e.g. U-Boot binary 2577 with a special header) as build targets. By defining 2578 CONFIG_BUILD_TARGET in the SoC / board header, this 2579 special image will be automatically built upon calling 2580 make / buildman. 2581 2582 CONFIG_IDENT_STRING 2583 2584 If defined, this string will be added to the U-Boot 2585 version information (U_BOOT_VERSION) 2586 2587- Vendor Parameter Protection: 2588 2589 U-Boot considers the values of the environment 2590 variables "serial#" (Board Serial Number) and 2591 "ethaddr" (Ethernet Address) to be parameters that 2592 are set once by the board vendor / manufacturer, and 2593 protects these variables from casual modification by 2594 the user. Once set, these variables are read-only, 2595 and write or delete attempts are rejected. You can 2596 change this behaviour: 2597 2598 If CONFIG_ENV_OVERWRITE is #defined in your config 2599 file, the write protection for vendor parameters is 2600 completely disabled. Anybody can change or delete 2601 these parameters. 2602 2603 Alternatively, if you define _both_ an ethaddr in the 2604 default env _and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default 2605 Ethernet address is installed in the environment, 2606 which can be changed exactly ONCE by the user. [The 2607 serial# is unaffected by this, i. e. it remains 2608 read-only.] 2609 2610 The same can be accomplished in a more flexible way 2611 for any variable by configuring the type of access 2612 to allow for those variables in the ".flags" variable 2613 or define CONFIG_ENV_FLAGS_LIST_STATIC. 2614 2615- Protected RAM: 2616 CONFIG_PRAM 2617 2618 Define this variable to enable the reservation of 2619 "protected RAM", i. e. RAM which is not overwritten 2620 by U-Boot. Define CONFIG_PRAM to hold the number of 2621 kB you want to reserve for pRAM. You can overwrite 2622 this default value by defining an environment 2623 variable "pram" to the number of kB you want to 2624 reserve. Note that the board info structure will 2625 still show the full amount of RAM. If pRAM is 2626 reserved, a new environment variable "mem" will 2627 automatically be defined to hold the amount of 2628 remaining RAM in a form that can be passed as boot 2629 argument to Linux, for instance like that: 2630 2631 setenv bootargs ... mem=\${mem} 2632 saveenv 2633 2634 This way you can tell Linux not to use this memory, 2635 either, which results in a memory region that will 2636 not be affected by reboots. 2637 2638 *WARNING* If your board configuration uses automatic 2639 detection of the RAM size, you must make sure that 2640 this memory test is non-destructive. So far, the 2641 following board configurations are known to be 2642 "pRAM-clean": 2643 2644 IVMS8, IVML24, SPD8xx, TQM8xxL, 2645 HERMES, IP860, RPXlite, LWMON, 2646 FLAGADM, TQM8260 2647 2648- Access to physical memory region (> 4GB) 2649 Some basic support is provided for operations on memory not 2650 normally accessible to U-Boot - e.g. some architectures 2651 support access to more than 4GB of memory on 32-bit 2652 machines using physical address extension or similar. 2653 Define CONFIG_PHYSMEM to access this basic support, which 2654 currently only supports clearing the memory. 2655 2656- Error Recovery: 2657 CONFIG_PANIC_HANG 2658 2659 Define this variable to stop the system in case of a 2660 fatal error, so that you have to reset it manually. 2661 This is probably NOT a good idea for an embedded 2662 system where you want the system to reboot 2663 automatically as fast as possible, but it may be 2664 useful during development since you can try to debug 2665 the conditions that lead to the situation. 2666 2667 CONFIG_NET_RETRY_COUNT 2668 2669 This variable defines the number of retries for 2670 network operations like ARP, RARP, TFTP, or BOOTP 2671 before giving up the operation. If not defined, a 2672 default value of 5 is used. 2673 2674 CONFIG_ARP_TIMEOUT 2675 2676 Timeout waiting for an ARP reply in milliseconds. 2677 2678 CONFIG_NFS_TIMEOUT 2679 2680 Timeout in milliseconds used in NFS protocol. 2681 If you encounter "ERROR: Cannot umount" in nfs command, 2682 try longer timeout such as 2683 #define CONFIG_NFS_TIMEOUT 10000UL 2684 2685- Command Interpreter: 2686 CONFIG_AUTO_COMPLETE 2687 2688 Enable auto completion of commands using TAB. 2689 2690 CONFIG_SYS_PROMPT_HUSH_PS2 2691 2692 This defines the secondary prompt string, which is 2693 printed when the command interpreter needs more input 2694 to complete a command. Usually "> ". 2695 2696 Note: 2697 2698 In the current implementation, the local variables 2699 space and global environment variables space are 2700 separated. Local variables are those you define by 2701 simply typing `name=value'. To access a local 2702 variable later on, you have write `$name' or 2703 `${name}'; to execute the contents of a variable 2704 directly type `$name' at the command prompt. 2705 2706 Global environment variables are those you use 2707 setenv/printenv to work with. To run a command stored 2708 in such a variable, you need to use the run command, 2709 and you must not use the '$' sign to access them. 2710 2711 To store commands and special characters in a 2712 variable, please use double quotation marks 2713 surrounding the whole text of the variable, instead 2714 of the backslashes before semicolons and special 2715 symbols. 2716 2717- Command Line Editing and History: 2718 CONFIG_CMDLINE_EDITING 2719 2720 Enable editing and History functions for interactive 2721 command line input operations 2722 2723- Command Line PS1/PS2 support: 2724 CONFIG_CMDLINE_PS_SUPPORT 2725 2726 Enable support for changing the command prompt string 2727 at run-time. Only static string is supported so far. 2728 The string is obtained from environment variables PS1 2729 and PS2. 2730 2731- Default Environment: 2732 CONFIG_EXTRA_ENV_SETTINGS 2733 2734 Define this to contain any number of null terminated 2735 strings (variable = value pairs) that will be part of 2736 the default environment compiled into the boot image. 2737 2738 For example, place something like this in your 2739 board's config file: 2740 2741 #define CONFIG_EXTRA_ENV_SETTINGS \ 2742 "myvar1=value1\0" \ 2743 "myvar2=value2\0" 2744 2745 Warning: This method is based on knowledge about the 2746 internal format how the environment is stored by the 2747 U-Boot code. This is NOT an official, exported 2748 interface! Although it is unlikely that this format 2749 will change soon, there is no guarantee either. 2750 You better know what you are doing here. 2751 2752 Note: overly (ab)use of the default environment is 2753 discouraged. Make sure to check other ways to preset 2754 the environment like the "source" command or the 2755 boot command first. 2756 2757 CONFIG_ENV_VARS_UBOOT_CONFIG 2758 2759 Define this in order to add variables describing the 2760 U-Boot build configuration to the default environment. 2761 These will be named arch, cpu, board, vendor, and soc. 2762 2763 Enabling this option will cause the following to be defined: 2764 2765 - CONFIG_SYS_ARCH 2766 - CONFIG_SYS_CPU 2767 - CONFIG_SYS_BOARD 2768 - CONFIG_SYS_VENDOR 2769 - CONFIG_SYS_SOC 2770 2771 CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG 2772 2773 Define this in order to add variables describing certain 2774 run-time determined information about the hardware to the 2775 environment. These will be named board_name, board_rev. 2776 2777 CONFIG_DELAY_ENVIRONMENT 2778 2779 Normally the environment is loaded when the board is 2780 initialised so that it is available to U-Boot. This inhibits 2781 that so that the environment is not available until 2782 explicitly loaded later by U-Boot code. With CONFIG_OF_CONTROL 2783 this is instead controlled by the value of 2784 /config/load-environment. 2785 2786- Parallel Flash support: 2787 CONFIG_SYS_NO_FLASH 2788 2789 Traditionally U-Boot was run on systems with parallel NOR 2790 flash. This option is used to disable support for parallel NOR 2791 flash. This option should be defined if the board does not have 2792 parallel flash. 2793 2794 If this option is not defined one of the generic flash drivers 2795 (e.g. CONFIG_FLASH_CFI_DRIVER or CONFIG_ST_SMI) must be 2796 selected or the board must provide an implementation of the 2797 flash API (see include/flash.h). 2798 2799- DataFlash Support: 2800 CONFIG_HAS_DATAFLASH 2801 2802 Defining this option enables DataFlash features and 2803 allows to read/write in Dataflash via the standard 2804 commands cp, md... 2805 2806- Serial Flash support 2807 CONFIG_CMD_SF 2808 2809 Defining this option enables SPI flash commands 2810 'sf probe/read/write/erase/update'. 2811 2812 Usage requires an initial 'probe' to define the serial 2813 flash parameters, followed by read/write/erase/update 2814 commands. 2815 2816 The following defaults may be provided by the platform 2817 to handle the common case when only a single serial 2818 flash is present on the system. 2819 2820 CONFIG_SF_DEFAULT_BUS Bus identifier 2821 CONFIG_SF_DEFAULT_CS Chip-select 2822 CONFIG_SF_DEFAULT_MODE (see include/spi.h) 2823 CONFIG_SF_DEFAULT_SPEED in Hz 2824 2825 CONFIG_CMD_SF_TEST 2826 2827 Define this option to include a destructive SPI flash 2828 test ('sf test'). 2829 2830 CONFIG_SF_DUAL_FLASH Dual flash memories 2831 2832 Define this option to use dual flash support where two flash 2833 memories can be connected with a given cs line. 2834 Currently Xilinx Zynq qspi supports these type of connections. 2835 2836- SystemACE Support: 2837 CONFIG_SYSTEMACE 2838 2839 Adding this option adds support for Xilinx SystemACE 2840 chips attached via some sort of local bus. The address 2841 of the chip must also be defined in the 2842 CONFIG_SYS_SYSTEMACE_BASE macro. For example: 2843 2844 #define CONFIG_SYSTEMACE 2845 #define CONFIG_SYS_SYSTEMACE_BASE 0xf0000000 2846 2847 When SystemACE support is added, the "ace" device type 2848 becomes available to the fat commands, i.e. fatls. 2849 2850- TFTP Fixed UDP Port: 2851 CONFIG_TFTP_PORT 2852 2853 If this is defined, the environment variable tftpsrcp 2854 is used to supply the TFTP UDP source port value. 2855 If tftpsrcp isn't defined, the normal pseudo-random port 2856 number generator is used. 2857 2858 Also, the environment variable tftpdstp is used to supply 2859 the TFTP UDP destination port value. If tftpdstp isn't 2860 defined, the normal port 69 is used. 2861 2862 The purpose for tftpsrcp is to allow a TFTP server to 2863 blindly start the TFTP transfer using the pre-configured 2864 target IP address and UDP port. This has the effect of 2865 "punching through" the (Windows XP) firewall, allowing 2866 the remainder of the TFTP transfer to proceed normally. 2867 A better solution is to properly configure the firewall, 2868 but sometimes that is not allowed. 2869 2870- Hashing support: 2871 CONFIG_CMD_HASH 2872 2873 This enables a generic 'hash' command which can produce 2874 hashes / digests from a few algorithms (e.g. SHA1, SHA256). 2875 2876 CONFIG_HASH_VERIFY 2877 2878 Enable the hash verify command (hash -v). This adds to code 2879 size a little. 2880 2881 CONFIG_SHA1 - This option enables support of hashing using SHA1 2882 algorithm. The hash is calculated in software. 2883 CONFIG_SHA256 - This option enables support of hashing using 2884 SHA256 algorithm. The hash is calculated in software. 2885 CONFIG_SHA_HW_ACCEL - This option enables hardware acceleration 2886 for SHA1/SHA256 hashing. 2887 This affects the 'hash' command and also the 2888 hash_lookup_algo() function. 2889 CONFIG_SHA_PROG_HW_ACCEL - This option enables 2890 hardware-acceleration for SHA1/SHA256 progressive hashing. 2891 Data can be streamed in a block at a time and the hashing 2892 is performed in hardware. 2893 2894 Note: There is also a sha1sum command, which should perhaps 2895 be deprecated in favour of 'hash sha1'. 2896 2897- Freescale i.MX specific commands: 2898 CONFIG_CMD_HDMIDETECT 2899 This enables 'hdmidet' command which returns true if an 2900 HDMI monitor is detected. This command is i.MX 6 specific. 2901 2902 CONFIG_CMD_BMODE 2903 This enables the 'bmode' (bootmode) command for forcing 2904 a boot from specific media. 2905 2906 This is useful for forcing the ROM's usb downloader to 2907 activate upon a watchdog reset which is nice when iterating 2908 on U-Boot. Using the reset button or running bmode normal 2909 will set it back to normal. This command currently 2910 supports i.MX53 and i.MX6. 2911 2912- bootcount support: 2913 CONFIG_BOOTCOUNT_LIMIT 2914 2915 This enables the bootcounter support, see: 2916 http://www.denx.de/wiki/DULG/UBootBootCountLimit 2917 2918 CONFIG_AT91SAM9XE 2919 enable special bootcounter support on at91sam9xe based boards. 2920 CONFIG_BLACKFIN 2921 enable special bootcounter support on blackfin based boards. 2922 CONFIG_SOC_DA8XX 2923 enable special bootcounter support on da850 based boards. 2924 CONFIG_BOOTCOUNT_RAM 2925 enable support for the bootcounter in RAM 2926 CONFIG_BOOTCOUNT_I2C 2927 enable support for the bootcounter on an i2c (like RTC) device. 2928 CONFIG_SYS_I2C_RTC_ADDR = i2c chip address 2929 CONFIG_SYS_BOOTCOUNT_ADDR = i2c addr which is used for 2930 the bootcounter. 2931 CONFIG_BOOTCOUNT_ALEN = address len 2932 2933- Show boot progress: 2934 CONFIG_SHOW_BOOT_PROGRESS 2935 2936 Defining this option allows to add some board- 2937 specific code (calling a user-provided function 2938 "show_boot_progress(int)") that enables you to show 2939 the system's boot progress on some display (for 2940 example, some LED's) on your board. At the moment, 2941 the following checkpoints are implemented: 2942 2943 2944Legacy uImage format: 2945 2946 Arg Where When 2947 1 common/cmd_bootm.c before attempting to boot an image 2948 -1 common/cmd_bootm.c Image header has bad magic number 2949 2 common/cmd_bootm.c Image header has correct magic number 2950 -2 common/cmd_bootm.c Image header has bad checksum 2951 3 common/cmd_bootm.c Image header has correct checksum 2952 -3 common/cmd_bootm.c Image data has bad checksum 2953 4 common/cmd_bootm.c Image data has correct checksum 2954 -4 common/cmd_bootm.c Image is for unsupported architecture 2955 5 common/cmd_bootm.c Architecture check OK 2956 -5 common/cmd_bootm.c Wrong Image Type (not kernel, multi) 2957 6 common/cmd_bootm.c Image Type check OK 2958 -6 common/cmd_bootm.c gunzip uncompression error 2959 -7 common/cmd_bootm.c Unimplemented compression type 2960 7 common/cmd_bootm.c Uncompression OK 2961 8 common/cmd_bootm.c No uncompress/copy overwrite error 2962 -9 common/cmd_bootm.c Unsupported OS (not Linux, BSD, VxWorks, QNX) 2963 2964 9 common/image.c Start initial ramdisk verification 2965 -10 common/image.c Ramdisk header has bad magic number 2966 -11 common/image.c Ramdisk header has bad checksum 2967 10 common/image.c Ramdisk header is OK 2968 -12 common/image.c Ramdisk data has bad checksum 2969 11 common/image.c Ramdisk data has correct checksum 2970 12 common/image.c Ramdisk verification complete, start loading 2971 -13 common/image.c Wrong Image Type (not PPC Linux ramdisk) 2972 13 common/image.c Start multifile image verification 2973 14 common/image.c No initial ramdisk, no multifile, continue. 2974 2975 15 arch/<arch>/lib/bootm.c All preparation done, transferring control to OS 2976 2977 -30 arch/powerpc/lib/board.c Fatal error, hang the system 2978 -31 post/post.c POST test failed, detected by post_output_backlog() 2979 -32 post/post.c POST test failed, detected by post_run_single() 2980 2981 34 common/cmd_doc.c before loading a Image from a DOC device 2982 -35 common/cmd_doc.c Bad usage of "doc" command 2983 35 common/cmd_doc.c correct usage of "doc" command 2984 -36 common/cmd_doc.c No boot device 2985 36 common/cmd_doc.c correct boot device 2986 -37 common/cmd_doc.c Unknown Chip ID on boot device 2987 37 common/cmd_doc.c correct chip ID found, device available 2988 -38 common/cmd_doc.c Read Error on boot device 2989 38 common/cmd_doc.c reading Image header from DOC device OK 2990 -39 common/cmd_doc.c Image header has bad magic number 2991 39 common/cmd_doc.c Image header has correct magic number 2992 -40 common/cmd_doc.c Error reading Image from DOC device 2993 40 common/cmd_doc.c Image header has correct magic number 2994 41 common/cmd_ide.c before loading a Image from a IDE device 2995 -42 common/cmd_ide.c Bad usage of "ide" command 2996 42 common/cmd_ide.c correct usage of "ide" command 2997 -43 common/cmd_ide.c No boot device 2998 43 common/cmd_ide.c boot device found 2999 -44 common/cmd_ide.c Device not available 3000 44 common/cmd_ide.c Device available 3001 -45 common/cmd_ide.c wrong partition selected 3002 45 common/cmd_ide.c partition selected 3003 -46 common/cmd_ide.c Unknown partition table 3004 46 common/cmd_ide.c valid partition table found 3005 -47 common/cmd_ide.c Invalid partition type 3006 47 common/cmd_ide.c correct partition type 3007 -48 common/cmd_ide.c Error reading Image Header on boot device 3008 48 common/cmd_ide.c reading Image Header from IDE device OK 3009 -49 common/cmd_ide.c Image header has bad magic number 3010 49 common/cmd_ide.c Image header has correct magic number 3011 -50 common/cmd_ide.c Image header has bad checksum 3012 50 common/cmd_ide.c Image header has correct checksum 3013 -51 common/cmd_ide.c Error reading Image from IDE device 3014 51 common/cmd_ide.c reading Image from IDE device OK 3015 52 common/cmd_nand.c before loading a Image from a NAND device 3016 -53 common/cmd_nand.c Bad usage of "nand" command 3017 53 common/cmd_nand.c correct usage of "nand" command 3018 -54 common/cmd_nand.c No boot device 3019 54 common/cmd_nand.c boot device found 3020 -55 common/cmd_nand.c Unknown Chip ID on boot device 3021 55 common/cmd_nand.c correct chip ID found, device available 3022 -56 common/cmd_nand.c Error reading Image Header on boot device 3023 56 common/cmd_nand.c reading Image Header from NAND device OK 3024 -57 common/cmd_nand.c Image header has bad magic number 3025 57 common/cmd_nand.c Image header has correct magic number 3026 -58 common/cmd_nand.c Error reading Image from NAND device 3027 58 common/cmd_nand.c reading Image from NAND device OK 3028 3029 -60 common/env_common.c Environment has a bad CRC, using default 3030 3031 64 net/eth.c starting with Ethernet configuration. 3032 -64 net/eth.c no Ethernet found. 3033 65 net/eth.c Ethernet found. 3034 3035 -80 common/cmd_net.c usage wrong 3036 80 common/cmd_net.c before calling net_loop() 3037 -81 common/cmd_net.c some error in net_loop() occurred 3038 81 common/cmd_net.c net_loop() back without error 3039 -82 common/cmd_net.c size == 0 (File with size 0 loaded) 3040 82 common/cmd_net.c trying automatic boot 3041 83 common/cmd_net.c running "source" command 3042 -83 common/cmd_net.c some error in automatic boot or "source" command 3043 84 common/cmd_net.c end without errors 3044 3045FIT uImage format: 3046 3047 Arg Where When 3048 100 common/cmd_bootm.c Kernel FIT Image has correct format 3049 -100 common/cmd_bootm.c Kernel FIT Image has incorrect format 3050 101 common/cmd_bootm.c No Kernel subimage unit name, using configuration 3051 -101 common/cmd_bootm.c Can't get configuration for kernel subimage 3052 102 common/cmd_bootm.c Kernel unit name specified 3053 -103 common/cmd_bootm.c Can't get kernel subimage node offset 3054 103 common/cmd_bootm.c Found configuration node 3055 104 common/cmd_bootm.c Got kernel subimage node offset 3056 -104 common/cmd_bootm.c Kernel subimage hash verification failed 3057 105 common/cmd_bootm.c Kernel subimage hash verification OK 3058 -105 common/cmd_bootm.c Kernel subimage is for unsupported architecture 3059 106 common/cmd_bootm.c Architecture check OK 3060 -106 common/cmd_bootm.c Kernel subimage has wrong type 3061 107 common/cmd_bootm.c Kernel subimage type OK 3062 -107 common/cmd_bootm.c Can't get kernel subimage data/size 3063 108 common/cmd_bootm.c Got kernel subimage data/size 3064 -108 common/cmd_bootm.c Wrong image type (not legacy, FIT) 3065 -109 common/cmd_bootm.c Can't get kernel subimage type 3066 -110 common/cmd_bootm.c Can't get kernel subimage comp 3067 -111 common/cmd_bootm.c Can't get kernel subimage os 3068 -112 common/cmd_bootm.c Can't get kernel subimage load address 3069 -113 common/cmd_bootm.c Image uncompress/copy overwrite error 3070 3071 120 common/image.c Start initial ramdisk verification 3072 -120 common/image.c Ramdisk FIT image has incorrect format 3073 121 common/image.c Ramdisk FIT image has correct format 3074 122 common/image.c No ramdisk subimage unit name, using configuration 3075 -122 common/image.c Can't get configuration for ramdisk subimage 3076 123 common/image.c Ramdisk unit name specified 3077 -124 common/image.c Can't get ramdisk subimage node offset 3078 125 common/image.c Got ramdisk subimage node offset 3079 -125 common/image.c Ramdisk subimage hash verification failed 3080 126 common/image.c Ramdisk subimage hash verification OK 3081 -126 common/image.c Ramdisk subimage for unsupported architecture 3082 127 common/image.c Architecture check OK 3083 -127 common/image.c Can't get ramdisk subimage data/size 3084 128 common/image.c Got ramdisk subimage data/size 3085 129 common/image.c Can't get ramdisk load address 3086 -129 common/image.c Got ramdisk load address 3087 3088 -130 common/cmd_doc.c Incorrect FIT image format 3089 131 common/cmd_doc.c FIT image format OK 3090 3091 -140 common/cmd_ide.c Incorrect FIT image format 3092 141 common/cmd_ide.c FIT image format OK 3093 3094 -150 common/cmd_nand.c Incorrect FIT image format 3095 151 common/cmd_nand.c FIT image format OK 3096 3097- legacy image format: 3098 CONFIG_IMAGE_FORMAT_LEGACY 3099 enables the legacy image format support in U-Boot. 3100 3101 Default: 3102 enabled if CONFIG_FIT_SIGNATURE is not defined. 3103 3104 CONFIG_DISABLE_IMAGE_LEGACY 3105 disable the legacy image format 3106 3107 This define is introduced, as the legacy image format is 3108 enabled per default for backward compatibility. 3109 3110- FIT image support: 3111 CONFIG_FIT_DISABLE_SHA256 3112 Supporting SHA256 hashes has quite an impact on binary size. 3113 For constrained systems sha256 hash support can be disabled 3114 with this option. 3115 3116 TODO(sjg@chromium.org): Adjust this option to be positive, 3117 and move it to Kconfig 3118 3119- Standalone program support: 3120 CONFIG_STANDALONE_LOAD_ADDR 3121 3122 This option defines a board specific value for the 3123 address where standalone program gets loaded, thus 3124 overwriting the architecture dependent default 3125 settings. 3126 3127- Frame Buffer Address: 3128 CONFIG_FB_ADDR 3129 3130 Define CONFIG_FB_ADDR if you want to use specific 3131 address for frame buffer. This is typically the case 3132 when using a graphics controller has separate video 3133 memory. U-Boot will then place the frame buffer at 3134 the given address instead of dynamically reserving it 3135 in system RAM by calling lcd_setmem(), which grabs 3136 the memory for the frame buffer depending on the 3137 configured panel size. 3138 3139 Please see board_init_f function. 3140 3141- Automatic software updates via TFTP server 3142 CONFIG_UPDATE_TFTP 3143 CONFIG_UPDATE_TFTP_CNT_MAX 3144 CONFIG_UPDATE_TFTP_MSEC_MAX 3145 3146 These options enable and control the auto-update feature; 3147 for a more detailed description refer to doc/README.update. 3148 3149- MTD Support (mtdparts command, UBI support) 3150 CONFIG_MTD_DEVICE 3151 3152 Adds the MTD device infrastructure from the Linux kernel. 3153 Needed for mtdparts command support. 3154 3155 CONFIG_MTD_PARTITIONS 3156 3157 Adds the MTD partitioning infrastructure from the Linux 3158 kernel. Needed for UBI support. 3159 3160- UBI support 3161 CONFIG_CMD_UBI 3162 3163 Adds commands for interacting with MTD partitions formatted 3164 with the UBI flash translation layer 3165 3166 Requires also defining CONFIG_RBTREE 3167 3168 CONFIG_UBI_SILENCE_MSG 3169 3170 Make the verbose messages from UBI stop printing. This leaves 3171 warnings and errors enabled. 3172 3173 3174 CONFIG_MTD_UBI_WL_THRESHOLD 3175 This parameter defines the maximum difference between the highest 3176 erase counter value and the lowest erase counter value of eraseblocks 3177 of UBI devices. When this threshold is exceeded, UBI starts performing 3178 wear leveling by means of moving data from eraseblock with low erase 3179 counter to eraseblocks with high erase counter. 3180 3181 The default value should be OK for SLC NAND flashes, NOR flashes and 3182 other flashes which have eraseblock life-cycle 100000 or more. 3183 However, in case of MLC NAND flashes which typically have eraseblock 3184 life-cycle less than 10000, the threshold should be lessened (e.g., 3185 to 128 or 256, although it does not have to be power of 2). 3186 3187 default: 4096 3188 3189 CONFIG_MTD_UBI_BEB_LIMIT 3190 This option specifies the maximum bad physical eraseblocks UBI 3191 expects on the MTD device (per 1024 eraseblocks). If the 3192 underlying flash does not admit of bad eraseblocks (e.g. NOR 3193 flash), this value is ignored. 3194 3195 NAND datasheets often specify the minimum and maximum NVM 3196 (Number of Valid Blocks) for the flashes' endurance lifetime. 3197 The maximum expected bad eraseblocks per 1024 eraseblocks 3198 then can be calculated as "1024 * (1 - MinNVB / MaxNVB)", 3199 which gives 20 for most NANDs (MaxNVB is basically the total 3200 count of eraseblocks on the chip). 3201 3202 To put it differently, if this value is 20, UBI will try to 3203 reserve about 1.9% of physical eraseblocks for bad blocks 3204 handling. And that will be 1.9% of eraseblocks on the entire 3205 NAND chip, not just the MTD partition UBI attaches. This means 3206 that if you have, say, a NAND flash chip admits maximum 40 bad 3207 eraseblocks, and it is split on two MTD partitions of the same 3208 size, UBI will reserve 40 eraseblocks when attaching a 3209 partition. 3210 3211 default: 20 3212 3213 CONFIG_MTD_UBI_FASTMAP 3214 Fastmap is a mechanism which allows attaching an UBI device 3215 in nearly constant time. Instead of scanning the whole MTD device it 3216 only has to locate a checkpoint (called fastmap) on the device. 3217 The on-flash fastmap contains all information needed to attach 3218 the device. Using fastmap makes only sense on large devices where 3219 attaching by scanning takes long. UBI will not automatically install 3220 a fastmap on old images, but you can set the UBI parameter 3221 CONFIG_MTD_UBI_FASTMAP_AUTOCONVERT to 1 if you want so. Please note 3222 that fastmap-enabled images are still usable with UBI implementations 3223 without fastmap support. On typical flash devices the whole fastmap 3224 fits into one PEB. UBI will reserve PEBs to hold two fastmaps. 3225 3226 CONFIG_MTD_UBI_FASTMAP_AUTOCONVERT 3227 Set this parameter to enable fastmap automatically on images 3228 without a fastmap. 3229 default: 0 3230 3231 CONFIG_MTD_UBI_FM_DEBUG 3232 Enable UBI fastmap debug 3233 default: 0 3234 3235- UBIFS support 3236 CONFIG_CMD_UBIFS 3237 3238 Adds commands for interacting with UBI volumes formatted as 3239 UBIFS. UBIFS is read-only in u-boot. 3240 3241 Requires UBI support as well as CONFIG_LZO 3242 3243 CONFIG_UBIFS_SILENCE_MSG 3244 3245 Make the verbose messages from UBIFS stop printing. This leaves 3246 warnings and errors enabled. 3247 3248- SPL framework 3249 CONFIG_SPL 3250 Enable building of SPL globally. 3251 3252 CONFIG_SPL_LDSCRIPT 3253 LDSCRIPT for linking the SPL binary. 3254 3255 CONFIG_SPL_MAX_FOOTPRINT 3256 Maximum size in memory allocated to the SPL, BSS included. 3257 When defined, the linker checks that the actual memory 3258 used by SPL from _start to __bss_end does not exceed it. 3259 CONFIG_SPL_MAX_FOOTPRINT and CONFIG_SPL_BSS_MAX_SIZE 3260 must not be both defined at the same time. 3261 3262 CONFIG_SPL_MAX_SIZE 3263 Maximum size of the SPL image (text, data, rodata, and 3264 linker lists sections), BSS excluded. 3265 When defined, the linker checks that the actual size does 3266 not exceed it. 3267 3268 CONFIG_SPL_TEXT_BASE 3269 TEXT_BASE for linking the SPL binary. 3270 3271 CONFIG_SPL_RELOC_TEXT_BASE 3272 Address to relocate to. If unspecified, this is equal to 3273 CONFIG_SPL_TEXT_BASE (i.e. no relocation is done). 3274 3275 CONFIG_SPL_BSS_START_ADDR 3276 Link address for the BSS within the SPL binary. 3277 3278 CONFIG_SPL_BSS_MAX_SIZE 3279 Maximum size in memory allocated to the SPL BSS. 3280 When defined, the linker checks that the actual memory used 3281 by SPL from __bss_start to __bss_end does not exceed it. 3282 CONFIG_SPL_MAX_FOOTPRINT and CONFIG_SPL_BSS_MAX_SIZE 3283 must not be both defined at the same time. 3284 3285 CONFIG_SPL_STACK 3286 Adress of the start of the stack SPL will use 3287 3288 CONFIG_SPL_PANIC_ON_RAW_IMAGE 3289 When defined, SPL will panic() if the image it has 3290 loaded does not have a signature. 3291 Defining this is useful when code which loads images 3292 in SPL cannot guarantee that absolutely all read errors 3293 will be caught. 3294 An example is the LPC32XX MLC NAND driver, which will 3295 consider that a completely unreadable NAND block is bad, 3296 and thus should be skipped silently. 3297 3298 CONFIG_SPL_ABORT_ON_RAW_IMAGE 3299 When defined, SPL will proceed to another boot method 3300 if the image it has loaded does not have a signature. 3301 3302 CONFIG_SPL_RELOC_STACK 3303 Adress of the start of the stack SPL will use after 3304 relocation. If unspecified, this is equal to 3305 CONFIG_SPL_STACK. 3306 3307 CONFIG_SYS_SPL_MALLOC_START 3308 Starting address of the malloc pool used in SPL. 3309 When this option is set the full malloc is used in SPL and 3310 it is set up by spl_init() and before that, the simple malloc() 3311 can be used if CONFIG_SYS_MALLOC_F is defined. 3312 3313 CONFIG_SYS_SPL_MALLOC_SIZE 3314 The size of the malloc pool used in SPL. 3315 3316 CONFIG_SPL_FRAMEWORK 3317 Enable the SPL framework under common/. This framework 3318 supports MMC, NAND and YMODEM loading of U-Boot and NAND 3319 NAND loading of the Linux Kernel. 3320 3321 CONFIG_SPL_OS_BOOT 3322 Enable booting directly to an OS from SPL. 3323 See also: doc/README.falcon 3324 3325 CONFIG_SPL_DISPLAY_PRINT 3326 For ARM, enable an optional function to print more information 3327 about the running system. 3328 3329 CONFIG_SPL_INIT_MINIMAL 3330 Arch init code should be built for a very small image 3331 3332 CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_PARTITION 3333 Partition on the MMC to load U-Boot from when the MMC is being 3334 used in raw mode 3335 3336 CONFIG_SYS_MMCSD_RAW_MODE_KERNEL_SECTOR 3337 Sector to load kernel uImage from when MMC is being 3338 used in raw mode (for Falcon mode) 3339 3340 CONFIG_SYS_MMCSD_RAW_MODE_ARGS_SECTOR, 3341 CONFIG_SYS_MMCSD_RAW_MODE_ARGS_SECTORS 3342 Sector and number of sectors to load kernel argument 3343 parameters from when MMC is being used in raw mode 3344 (for falcon mode) 3345 3346 CONFIG_SYS_MMCSD_FS_BOOT_PARTITION 3347 Partition on the MMC to load U-Boot from when the MMC is being 3348 used in fs mode 3349 3350 CONFIG_SPL_FS_LOAD_PAYLOAD_NAME 3351 Filename to read to load U-Boot when reading from filesystem 3352 3353 CONFIG_SPL_FS_LOAD_KERNEL_NAME 3354 Filename to read to load kernel uImage when reading 3355 from filesystem (for Falcon mode) 3356 3357 CONFIG_SPL_FS_LOAD_ARGS_NAME 3358 Filename to read to load kernel argument parameters 3359 when reading from filesystem (for Falcon mode) 3360 3361 CONFIG_SPL_MPC83XX_WAIT_FOR_NAND 3362 Set this for NAND SPL on PPC mpc83xx targets, so that 3363 start.S waits for the rest of the SPL to load before 3364 continuing (the hardware starts execution after just 3365 loading the first page rather than the full 4K). 3366 3367 CONFIG_SPL_SKIP_RELOCATE 3368 Avoid SPL relocation 3369 3370 CONFIG_SPL_NAND_BASE 3371 Include nand_base.c in the SPL. Requires 3372 CONFIG_SPL_NAND_DRIVERS. 3373 3374 CONFIG_SPL_NAND_DRIVERS 3375 SPL uses normal NAND drivers, not minimal drivers. 3376 3377 CONFIG_SPL_NAND_ECC 3378 Include standard software ECC in the SPL 3379 3380 CONFIG_SPL_NAND_SIMPLE 3381 Support for NAND boot using simple NAND drivers that 3382 expose the cmd_ctrl() interface. 3383 3384 CONFIG_SPL_UBI 3385 Support for a lightweight UBI (fastmap) scanner and 3386 loader 3387 3388 CONFIG_SPL_NAND_RAW_ONLY 3389 Support to boot only raw u-boot.bin images. Use this only 3390 if you need to save space. 3391 3392 CONFIG_SPL_COMMON_INIT_DDR 3393 Set for common ddr init with serial presence detect in 3394 SPL binary. 3395 3396 CONFIG_SYS_NAND_5_ADDR_CYCLE, CONFIG_SYS_NAND_PAGE_COUNT, 3397 CONFIG_SYS_NAND_PAGE_SIZE, CONFIG_SYS_NAND_OOBSIZE, 3398 CONFIG_SYS_NAND_BLOCK_SIZE, CONFIG_SYS_NAND_BAD_BLOCK_POS, 3399 CONFIG_SYS_NAND_ECCPOS, CONFIG_SYS_NAND_ECCSIZE, 3400 CONFIG_SYS_NAND_ECCBYTES 3401 Defines the size and behavior of the NAND that SPL uses 3402 to read U-Boot 3403 3404 CONFIG_SPL_NAND_BOOT 3405 Add support NAND boot 3406 3407 CONFIG_SYS_NAND_U_BOOT_OFFS 3408 Location in NAND to read U-Boot from 3409 3410 CONFIG_SYS_NAND_U_BOOT_DST 3411 Location in memory to load U-Boot to 3412 3413 CONFIG_SYS_NAND_U_BOOT_SIZE 3414 Size of image to load 3415 3416 CONFIG_SYS_NAND_U_BOOT_START 3417 Entry point in loaded image to jump to 3418 3419 CONFIG_SYS_NAND_HW_ECC_OOBFIRST 3420 Define this if you need to first read the OOB and then the 3421 data. This is used, for example, on davinci platforms. 3422 3423 CONFIG_SPL_OMAP3_ID_NAND 3424 Support for an OMAP3-specific set of functions to return the 3425 ID and MFR of the first attached NAND chip, if present. 3426 3427 CONFIG_SPL_RAM_DEVICE 3428 Support for running image already present in ram, in SPL binary 3429 3430 CONFIG_SPL_PAD_TO 3431 Image offset to which the SPL should be padded before appending 3432 the SPL payload. By default, this is defined as 3433 CONFIG_SPL_MAX_SIZE, or 0 if CONFIG_SPL_MAX_SIZE is undefined. 3434 CONFIG_SPL_PAD_TO must be either 0, meaning to append the SPL 3435 payload without any padding, or >= CONFIG_SPL_MAX_SIZE. 3436 3437 CONFIG_SPL_TARGET 3438 Final target image containing SPL and payload. Some SPLs 3439 use an arch-specific makefile fragment instead, for 3440 example if more than one image needs to be produced. 3441 3442 CONFIG_FIT_SPL_PRINT 3443 Printing information about a FIT image adds quite a bit of 3444 code to SPL. So this is normally disabled in SPL. Use this 3445 option to re-enable it. This will affect the output of the 3446 bootm command when booting a FIT image. 3447 3448- TPL framework 3449 CONFIG_TPL 3450 Enable building of TPL globally. 3451 3452 CONFIG_TPL_PAD_TO 3453 Image offset to which the TPL should be padded before appending 3454 the TPL payload. By default, this is defined as 3455 CONFIG_SPL_MAX_SIZE, or 0 if CONFIG_SPL_MAX_SIZE is undefined. 3456 CONFIG_SPL_PAD_TO must be either 0, meaning to append the SPL 3457 payload without any padding, or >= CONFIG_SPL_MAX_SIZE. 3458 3459- Interrupt support (PPC): 3460 3461 There are common interrupt_init() and timer_interrupt() 3462 for all PPC archs. interrupt_init() calls interrupt_init_cpu() 3463 for CPU specific initialization. interrupt_init_cpu() 3464 should set decrementer_count to appropriate value. If 3465 CPU resets decrementer automatically after interrupt 3466 (ppc4xx) it should set decrementer_count to zero. 3467 timer_interrupt() calls timer_interrupt_cpu() for CPU 3468 specific handling. If board has watchdog / status_led 3469 / other_activity_monitor it works automatically from 3470 general timer_interrupt(). 3471 3472 3473Board initialization settings: 3474------------------------------ 3475 3476During Initialization u-boot calls a number of board specific functions 3477to allow the preparation of board specific prerequisites, e.g. pin setup 3478before drivers are initialized. To enable these callbacks the 3479following configuration macros have to be defined. Currently this is 3480architecture specific, so please check arch/your_architecture/lib/board.c 3481typically in board_init_f() and board_init_r(). 3482 3483- CONFIG_BOARD_EARLY_INIT_F: Call board_early_init_f() 3484- CONFIG_BOARD_EARLY_INIT_R: Call board_early_init_r() 3485- CONFIG_BOARD_LATE_INIT: Call board_late_init() 3486- CONFIG_BOARD_POSTCLK_INIT: Call board_postclk_init() 3487 3488Configuration Settings: 3489----------------------- 3490 3491- CONFIG_SYS_SUPPORT_64BIT_DATA: Defined automatically if compiled as 64-bit. 3492 Optionally it can be defined to support 64-bit memory commands. 3493 3494- CONFIG_SYS_LONGHELP: Defined when you want long help messages included; 3495 undefine this when you're short of memory. 3496 3497- CONFIG_SYS_HELP_CMD_WIDTH: Defined when you want to override the default 3498 width of the commands listed in the 'help' command output. 3499 3500- CONFIG_SYS_PROMPT: This is what U-Boot prints on the console to 3501 prompt for user input. 3502 3503- CONFIG_SYS_CBSIZE: Buffer size for input from the Console 3504 3505- CONFIG_SYS_PBSIZE: Buffer size for Console output 3506 3507- CONFIG_SYS_MAXARGS: max. Number of arguments accepted for monitor commands 3508 3509- CONFIG_SYS_BARGSIZE: Buffer size for Boot Arguments which are passed to 3510 the application (usually a Linux kernel) when it is 3511 booted 3512 3513- CONFIG_SYS_BAUDRATE_TABLE: 3514 List of legal baudrate settings for this board. 3515 3516- CONFIG_SYS_MEMTEST_START, CONFIG_SYS_MEMTEST_END: 3517 Begin and End addresses of the area used by the 3518 simple memory test. 3519 3520- CONFIG_SYS_ALT_MEMTEST: 3521 Enable an alternate, more extensive memory test. 3522 3523- CONFIG_SYS_MEMTEST_SCRATCH: 3524 Scratch address used by the alternate memory test 3525 You only need to set this if address zero isn't writeable 3526 3527- CONFIG_SYS_MEM_RESERVE_SECURE 3528 Only implemented for ARMv8 for now. 3529 If defined, the size of CONFIG_SYS_MEM_RESERVE_SECURE memory 3530 is substracted from total RAM and won't be reported to OS. 3531 This memory can be used as secure memory. A variable 3532 gd->arch.secure_ram is used to track the location. In systems 3533 the RAM base is not zero, or RAM is divided into banks, 3534 this variable needs to be recalcuated to get the address. 3535 3536- CONFIG_SYS_MEM_TOP_HIDE: 3537 If CONFIG_SYS_MEM_TOP_HIDE is defined in the board config header, 3538 this specified memory area will get subtracted from the top 3539 (end) of RAM and won't get "touched" at all by U-Boot. By 3540 fixing up gd->ram_size the Linux kernel should gets passed 3541 the now "corrected" memory size and won't touch it either. 3542 This should work for arch/ppc and arch/powerpc. Only Linux 3543 board ports in arch/powerpc with bootwrapper support that 3544 recalculate the memory size from the SDRAM controller setup 3545 will have to get fixed in Linux additionally. 3546 3547 This option can be used as a workaround for the 440EPx/GRx 3548 CHIP 11 errata where the last 256 bytes in SDRAM shouldn't 3549 be touched. 3550 3551 WARNING: Please make sure that this value is a multiple of 3552 the Linux page size (normally 4k). If this is not the case, 3553 then the end address of the Linux memory will be located at a 3554 non page size aligned address and this could cause major 3555 problems. 3556 3557- CONFIG_SYS_LOADS_BAUD_CHANGE: 3558 Enable temporary baudrate change while serial download 3559 3560- CONFIG_SYS_SDRAM_BASE: 3561 Physical start address of SDRAM. _Must_ be 0 here. 3562 3563- CONFIG_SYS_FLASH_BASE: 3564 Physical start address of Flash memory. 3565 3566- CONFIG_SYS_MONITOR_BASE: 3567 Physical start address of boot monitor code (set by 3568 make config files to be same as the text base address 3569 (CONFIG_SYS_TEXT_BASE) used when linking) - same as 3570 CONFIG_SYS_FLASH_BASE when booting from flash. 3571 3572- CONFIG_SYS_MONITOR_LEN: 3573 Size of memory reserved for monitor code, used to 3574 determine _at_compile_time_ (!) if the environment is 3575 embedded within the U-Boot image, or in a separate 3576 flash sector. 3577 3578- CONFIG_SYS_MALLOC_LEN: 3579 Size of DRAM reserved for malloc() use. 3580 3581- CONFIG_SYS_MALLOC_F_LEN 3582 Size of the malloc() pool for use before relocation. If 3583 this is defined, then a very simple malloc() implementation 3584 will become available before relocation. The address is just 3585 below the global data, and the stack is moved down to make 3586 space. 3587 3588 This feature allocates regions with increasing addresses 3589 within the region. calloc() is supported, but realloc() 3590 is not available. free() is supported but does nothing. 3591 The memory will be freed (or in fact just forgotten) when 3592 U-Boot relocates itself. 3593 3594- CONFIG_SYS_MALLOC_SIMPLE 3595 Provides a simple and small malloc() and calloc() for those 3596 boards which do not use the full malloc in SPL (which is 3597 enabled with CONFIG_SYS_SPL_MALLOC_START). 3598 3599- CONFIG_SYS_NONCACHED_MEMORY: 3600 Size of non-cached memory area. This area of memory will be 3601 typically located right below the malloc() area and mapped 3602 uncached in the MMU. This is useful for drivers that would 3603 otherwise require a lot of explicit cache maintenance. For 3604 some drivers it's also impossible to properly maintain the 3605 cache. For example if the regions that need to be flushed 3606 are not a multiple of the cache-line size, *and* padding 3607 cannot be allocated between the regions to align them (i.e. 3608 if the HW requires a contiguous array of regions, and the 3609 size of each region is not cache-aligned), then a flush of 3610 one region may result in overwriting data that hardware has 3611 written to another region in the same cache-line. This can 3612 happen for example in network drivers where descriptors for 3613 buffers are typically smaller than the CPU cache-line (e.g. 3614 16 bytes vs. 32 or 64 bytes). 3615 3616 Non-cached memory is only supported on 32-bit ARM at present. 3617 3618- CONFIG_SYS_BOOTM_LEN: 3619 Normally compressed uImages are limited to an 3620 uncompressed size of 8 MBytes. If this is not enough, 3621 you can define CONFIG_SYS_BOOTM_LEN in your board config file 3622 to adjust this setting to your needs. 3623 3624- CONFIG_SYS_BOOTMAPSZ: 3625 Maximum size of memory mapped by the startup code of 3626 the Linux kernel; all data that must be processed by 3627 the Linux kernel (bd_info, boot arguments, FDT blob if 3628 used) must be put below this limit, unless "bootm_low" 3629 environment variable is defined and non-zero. In such case 3630 all data for the Linux kernel must be between "bootm_low" 3631 and "bootm_low" + CONFIG_SYS_BOOTMAPSZ. The environment 3632 variable "bootm_mapsize" will override the value of 3633 CONFIG_SYS_BOOTMAPSZ. If CONFIG_SYS_BOOTMAPSZ is undefined, 3634 then the value in "bootm_size" will be used instead. 3635 3636- CONFIG_SYS_BOOT_RAMDISK_HIGH: 3637 Enable initrd_high functionality. If defined then the 3638 initrd_high feature is enabled and the bootm ramdisk subcommand 3639 is enabled. 3640 3641- CONFIG_SYS_BOOT_GET_CMDLINE: 3642 Enables allocating and saving kernel cmdline in space between 3643 "bootm_low" and "bootm_low" + BOOTMAPSZ. 3644 3645- CONFIG_SYS_BOOT_GET_KBD: 3646 Enables allocating and saving a kernel copy of the bd_info in 3647 space between "bootm_low" and "bootm_low" + BOOTMAPSZ. 3648 3649- CONFIG_SYS_MAX_FLASH_BANKS: 3650 Max number of Flash memory banks 3651 3652- CONFIG_SYS_MAX_FLASH_SECT: 3653 Max number of sectors on a Flash chip 3654 3655- CONFIG_SYS_FLASH_ERASE_TOUT: 3656 Timeout for Flash erase operations (in ms) 3657 3658- CONFIG_SYS_FLASH_WRITE_TOUT: 3659 Timeout for Flash write operations (in ms) 3660 3661- CONFIG_SYS_FLASH_LOCK_TOUT 3662 Timeout for Flash set sector lock bit operation (in ms) 3663 3664- CONFIG_SYS_FLASH_UNLOCK_TOUT 3665 Timeout for Flash clear lock bits operation (in ms) 3666 3667- CONFIG_SYS_FLASH_PROTECTION 3668 If defined, hardware flash sectors protection is used 3669 instead of U-Boot software protection. 3670 3671- CONFIG_SYS_DIRECT_FLASH_TFTP: 3672 3673 Enable TFTP transfers directly to flash memory; 3674 without this option such a download has to be 3675 performed in two steps: (1) download to RAM, and (2) 3676 copy from RAM to flash. 3677 3678 The two-step approach is usually more reliable, since 3679 you can check if the download worked before you erase 3680 the flash, but in some situations (when system RAM is 3681 too limited to allow for a temporary copy of the 3682 downloaded image) this option may be very useful. 3683 3684- CONFIG_SYS_FLASH_CFI: 3685 Define if the flash driver uses extra elements in the 3686 common flash structure for storing flash geometry. 3687 3688- CONFIG_FLASH_CFI_DRIVER 3689 This option also enables the building of the cfi_flash driver 3690 in the drivers directory 3691 3692- CONFIG_FLASH_CFI_MTD 3693 This option enables the building of the cfi_mtd driver 3694 in the drivers directory. The driver exports CFI flash 3695 to the MTD layer. 3696 3697- CONFIG_SYS_FLASH_USE_BUFFER_WRITE 3698 Use buffered writes to flash. 3699 3700- CONFIG_FLASH_SPANSION_S29WS_N 3701 s29ws-n MirrorBit flash has non-standard addresses for buffered 3702 write commands. 3703 3704- CONFIG_SYS_FLASH_QUIET_TEST 3705 If this option is defined, the common CFI flash doesn't 3706 print it's warning upon not recognized FLASH banks. This 3707 is useful, if some of the configured banks are only 3708 optionally available. 3709 3710- CONFIG_FLASH_SHOW_PROGRESS 3711 If defined (must be an integer), print out countdown 3712 digits and dots. Recommended value: 45 (9..1) for 80 3713 column displays, 15 (3..1) for 40 column displays. 3714 3715- CONFIG_FLASH_VERIFY 3716 If defined, the content of the flash (destination) is compared 3717 against the source after the write operation. An error message 3718 will be printed when the contents are not identical. 3719 Please note that this option is useless in nearly all cases, 3720 since such flash programming errors usually are detected earlier 3721 while unprotecting/erasing/programming. Please only enable 3722 this option if you really know what you are doing. 3723 3724- CONFIG_SYS_RX_ETH_BUFFER: 3725 Defines the number of Ethernet receive buffers. On some 3726 Ethernet controllers it is recommended to set this value 3727 to 8 or even higher (EEPRO100 or 405 EMAC), since all 3728 buffers can be full shortly after enabling the interface 3729 on high Ethernet traffic. 3730 Defaults to 4 if not defined. 3731 3732- CONFIG_ENV_MAX_ENTRIES 3733 3734 Maximum number of entries in the hash table that is used 3735 internally to store the environment settings. The default 3736 setting is supposed to be generous and should work in most 3737 cases. This setting can be used to tune behaviour; see 3738 lib/hashtable.c for details. 3739 3740- CONFIG_ENV_FLAGS_LIST_DEFAULT 3741- CONFIG_ENV_FLAGS_LIST_STATIC 3742 Enable validation of the values given to environment variables when 3743 calling env set. Variables can be restricted to only decimal, 3744 hexadecimal, or boolean. If CONFIG_CMD_NET is also defined, 3745 the variables can also be restricted to IP address or MAC address. 3746 3747 The format of the list is: 3748 type_attribute = [s|d|x|b|i|m] 3749 access_attribute = [a|r|o|c] 3750 attributes = type_attribute[access_attribute] 3751 entry = variable_name[:attributes] 3752 list = entry[,list] 3753 3754 The type attributes are: 3755 s - String (default) 3756 d - Decimal 3757 x - Hexadecimal 3758 b - Boolean ([1yYtT|0nNfF]) 3759 i - IP address 3760 m - MAC address 3761 3762 The access attributes are: 3763 a - Any (default) 3764 r - Read-only 3765 o - Write-once 3766 c - Change-default 3767 3768 - CONFIG_ENV_FLAGS_LIST_DEFAULT 3769 Define this to a list (string) to define the ".flags" 3770 environment variable in the default or embedded environment. 3771 3772 - CONFIG_ENV_FLAGS_LIST_STATIC 3773 Define this to a list (string) to define validation that 3774 should be done if an entry is not found in the ".flags" 3775 environment variable. To override a setting in the static 3776 list, simply add an entry for the same variable name to the 3777 ".flags" variable. 3778 3779 If CONFIG_REGEX is defined, the variable_name above is evaluated as a 3780 regular expression. This allows multiple variables to define the same 3781 flags without explicitly listing them for each variable. 3782 3783- CONFIG_ENV_ACCESS_IGNORE_FORCE 3784 If defined, don't allow the -f switch to env set override variable 3785 access flags. 3786 3787- CONFIG_OMAP_PLATFORM_RESET_TIME_MAX_USEC (OMAP only) 3788 This is set by OMAP boards for the max time that reset should 3789 be asserted. See doc/README.omap-reset-time for details on how 3790 the value can be calculated on a given board. 3791 3792- CONFIG_USE_STDINT 3793 If stdint.h is available with your toolchain you can define this 3794 option to enable it. You can provide option 'USE_STDINT=1' when 3795 building U-Boot to enable this. 3796 3797The following definitions that deal with the placement and management 3798of environment data (variable area); in general, we support the 3799following configurations: 3800 3801- CONFIG_BUILD_ENVCRC: 3802 3803 Builds up envcrc with the target environment so that external utils 3804 may easily extract it and embed it in final U-Boot images. 3805 3806- CONFIG_ENV_IS_IN_FLASH: 3807 3808 Define this if the environment is in flash memory. 3809 3810 a) The environment occupies one whole flash sector, which is 3811 "embedded" in the text segment with the U-Boot code. This 3812 happens usually with "bottom boot sector" or "top boot 3813 sector" type flash chips, which have several smaller 3814 sectors at the start or the end. For instance, such a 3815 layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In 3816 such a case you would place the environment in one of the 3817 4 kB sectors - with U-Boot code before and after it. With 3818 "top boot sector" type flash chips, you would put the 3819 environment in one of the last sectors, leaving a gap 3820 between U-Boot and the environment. 3821 3822 - CONFIG_ENV_OFFSET: 3823 3824 Offset of environment data (variable area) to the 3825 beginning of flash memory; for instance, with bottom boot 3826 type flash chips the second sector can be used: the offset 3827 for this sector is given here. 3828 3829 CONFIG_ENV_OFFSET is used relative to CONFIG_SYS_FLASH_BASE. 3830 3831 - CONFIG_ENV_ADDR: 3832 3833 This is just another way to specify the start address of 3834 the flash sector containing the environment (instead of 3835 CONFIG_ENV_OFFSET). 3836 3837 - CONFIG_ENV_SECT_SIZE: 3838 3839 Size of the sector containing the environment. 3840 3841 3842 b) Sometimes flash chips have few, equal sized, BIG sectors. 3843 In such a case you don't want to spend a whole sector for 3844 the environment. 3845 3846 - CONFIG_ENV_SIZE: 3847 3848 If you use this in combination with CONFIG_ENV_IS_IN_FLASH 3849 and CONFIG_ENV_SECT_SIZE, you can specify to use only a part 3850 of this flash sector for the environment. This saves 3851 memory for the RAM copy of the environment. 3852 3853 It may also save flash memory if you decide to use this 3854 when your environment is "embedded" within U-Boot code, 3855 since then the remainder of the flash sector could be used 3856 for U-Boot code. It should be pointed out that this is 3857 STRONGLY DISCOURAGED from a robustness point of view: 3858 updating the environment in flash makes it always 3859 necessary to erase the WHOLE sector. If something goes 3860 wrong before the contents has been restored from a copy in 3861 RAM, your target system will be dead. 3862 3863 - CONFIG_ENV_ADDR_REDUND 3864 CONFIG_ENV_SIZE_REDUND 3865 3866 These settings describe a second storage area used to hold 3867 a redundant copy of the environment data, so that there is 3868 a valid backup copy in case there is a power failure during 3869 a "saveenv" operation. 3870 3871BE CAREFUL! Any changes to the flash layout, and some changes to the 3872source code will make it necessary to adapt <board>/u-boot.lds* 3873accordingly! 3874 3875 3876- CONFIG_ENV_IS_IN_NVRAM: 3877 3878 Define this if you have some non-volatile memory device 3879 (NVRAM, battery buffered SRAM) which you want to use for the 3880 environment. 3881 3882 - CONFIG_ENV_ADDR: 3883 - CONFIG_ENV_SIZE: 3884 3885 These two #defines are used to determine the memory area you 3886 want to use for environment. It is assumed that this memory 3887 can just be read and written to, without any special 3888 provision. 3889 3890BE CAREFUL! The first access to the environment happens quite early 3891in U-Boot initialization (when we try to get the setting of for the 3892console baudrate). You *MUST* have mapped your NVRAM area then, or 3893U-Boot will hang. 3894 3895Please note that even with NVRAM we still use a copy of the 3896environment in RAM: we could work on NVRAM directly, but we want to 3897keep settings there always unmodified except somebody uses "saveenv" 3898to save the current settings. 3899 3900 3901- CONFIG_ENV_IS_IN_EEPROM: 3902 3903 Use this if you have an EEPROM or similar serial access 3904 device and a driver for it. 3905 3906 - CONFIG_ENV_OFFSET: 3907 - CONFIG_ENV_SIZE: 3908 3909 These two #defines specify the offset and size of the 3910 environment area within the total memory of your EEPROM. 3911 3912 - CONFIG_SYS_I2C_EEPROM_ADDR: 3913 If defined, specified the chip address of the EEPROM device. 3914 The default address is zero. 3915 3916 - CONFIG_SYS_I2C_EEPROM_BUS: 3917 If defined, specified the i2c bus of the EEPROM device. 3918 3919 - CONFIG_SYS_EEPROM_PAGE_WRITE_BITS: 3920 If defined, the number of bits used to address bytes in a 3921 single page in the EEPROM device. A 64 byte page, for example 3922 would require six bits. 3923 3924 - CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS: 3925 If defined, the number of milliseconds to delay between 3926 page writes. The default is zero milliseconds. 3927 3928 - CONFIG_SYS_I2C_EEPROM_ADDR_LEN: 3929 The length in bytes of the EEPROM memory array address. Note 3930 that this is NOT the chip address length! 3931 3932 - CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW: 3933 EEPROM chips that implement "address overflow" are ones 3934 like Catalyst 24WC04/08/16 which has 9/10/11 bits of 3935 address and the extra bits end up in the "chip address" bit 3936 slots. This makes a 24WC08 (1Kbyte) chip look like four 256 3937 byte chips. 3938 3939 Note that we consider the length of the address field to 3940 still be one byte because the extra address bits are hidden 3941 in the chip address. 3942 3943 - CONFIG_SYS_EEPROM_SIZE: 3944 The size in bytes of the EEPROM device. 3945 3946 - CONFIG_ENV_EEPROM_IS_ON_I2C 3947 define this, if you have I2C and SPI activated, and your 3948 EEPROM, which holds the environment, is on the I2C bus. 3949 3950 - CONFIG_I2C_ENV_EEPROM_BUS 3951 if you have an Environment on an EEPROM reached over 3952 I2C muxes, you can define here, how to reach this 3953 EEPROM. For example: 3954 3955 #define CONFIG_I2C_ENV_EEPROM_BUS 1 3956 3957 EEPROM which holds the environment, is reached over 3958 a pca9547 i2c mux with address 0x70, channel 3. 3959 3960- CONFIG_ENV_IS_IN_DATAFLASH: 3961 3962 Define this if you have a DataFlash memory device which you 3963 want to use for the environment. 3964 3965 - CONFIG_ENV_OFFSET: 3966 - CONFIG_ENV_ADDR: 3967 - CONFIG_ENV_SIZE: 3968 3969 These three #defines specify the offset and size of the 3970 environment area within the total memory of your DataFlash placed 3971 at the specified address. 3972 3973- CONFIG_ENV_IS_IN_SPI_FLASH: 3974 3975 Define this if you have a SPI Flash memory device which you 3976 want to use for the environment. 3977 3978 - CONFIG_ENV_OFFSET: 3979 - CONFIG_ENV_SIZE: 3980 3981 These two #defines specify the offset and size of the 3982 environment area within the SPI Flash. CONFIG_ENV_OFFSET must be 3983 aligned to an erase sector boundary. 3984 3985 - CONFIG_ENV_SECT_SIZE: 3986 3987 Define the SPI flash's sector size. 3988 3989 - CONFIG_ENV_OFFSET_REDUND (optional): 3990 3991 This setting describes a second storage area of CONFIG_ENV_SIZE 3992 size used to hold a redundant copy of the environment data, so 3993 that there is a valid backup copy in case there is a power failure 3994 during a "saveenv" operation. CONFIG_ENV_OFFSET_REDUND must be 3995 aligned to an erase sector boundary. 3996 3997 - CONFIG_ENV_SPI_BUS (optional): 3998 - CONFIG_ENV_SPI_CS (optional): 3999 4000 Define the SPI bus and chip select. If not defined they will be 0. 4001 4002 - CONFIG_ENV_SPI_MAX_HZ (optional): 4003 4004 Define the SPI max work clock. If not defined then use 1MHz. 4005 4006 - CONFIG_ENV_SPI_MODE (optional): 4007 4008 Define the SPI work mode. If not defined then use SPI_MODE_3. 4009 4010- CONFIG_ENV_IS_IN_REMOTE: 4011 4012 Define this if you have a remote memory space which you 4013 want to use for the local device's environment. 4014 4015 - CONFIG_ENV_ADDR: 4016 - CONFIG_ENV_SIZE: 4017 4018 These two #defines specify the address and size of the 4019 environment area within the remote memory space. The 4020 local device can get the environment from remote memory 4021 space by SRIO or PCIE links. 4022 4023BE CAREFUL! For some special cases, the local device can not use 4024"saveenv" command. For example, the local device will get the 4025environment stored in a remote NOR flash by SRIO or PCIE link, 4026but it can not erase, write this NOR flash by SRIO or PCIE interface. 4027 4028- CONFIG_ENV_IS_IN_NAND: 4029 4030 Define this if you have a NAND device which you want to use 4031 for the environment. 4032 4033 - CONFIG_ENV_OFFSET: 4034 - CONFIG_ENV_SIZE: 4035 4036 These two #defines specify the offset and size of the environment 4037 area within the first NAND device. CONFIG_ENV_OFFSET must be 4038 aligned to an erase block boundary. 4039 4040 - CONFIG_ENV_OFFSET_REDUND (optional): 4041 4042 This setting describes a second storage area of CONFIG_ENV_SIZE 4043 size used to hold a redundant copy of the environment data, so 4044 that there is a valid backup copy in case there is a power failure 4045 during a "saveenv" operation. CONFIG_ENV_OFFSET_REDUND must be 4046 aligned to an erase block boundary. 4047 4048 - CONFIG_ENV_RANGE (optional): 4049 4050 Specifies the length of the region in which the environment 4051 can be written. This should be a multiple of the NAND device's 4052 block size. Specifying a range with more erase blocks than 4053 are needed to hold CONFIG_ENV_SIZE allows bad blocks within 4054 the range to be avoided. 4055 4056 - CONFIG_ENV_OFFSET_OOB (optional): 4057 4058 Enables support for dynamically retrieving the offset of the 4059 environment from block zero's out-of-band data. The 4060 "nand env.oob" command can be used to record this offset. 4061 Currently, CONFIG_ENV_OFFSET_REDUND is not supported when 4062 using CONFIG_ENV_OFFSET_OOB. 4063 4064- CONFIG_NAND_ENV_DST 4065 4066 Defines address in RAM to which the nand_spl code should copy the 4067 environment. If redundant environment is used, it will be copied to 4068 CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE. 4069 4070- CONFIG_ENV_IS_IN_UBI: 4071 4072 Define this if you have an UBI volume that you want to use for the 4073 environment. This has the benefit of wear-leveling the environment 4074 accesses, which is important on NAND. 4075 4076 - CONFIG_ENV_UBI_PART: 4077 4078 Define this to a string that is the mtd partition containing the UBI. 4079 4080 - CONFIG_ENV_UBI_VOLUME: 4081 4082 Define this to the name of the volume that you want to store the 4083 environment in. 4084 4085 - CONFIG_ENV_UBI_VOLUME_REDUND: 4086 4087 Define this to the name of another volume to store a second copy of 4088 the environment in. This will enable redundant environments in UBI. 4089 It is assumed that both volumes are in the same MTD partition. 4090 4091 - CONFIG_UBI_SILENCE_MSG 4092 - CONFIG_UBIFS_SILENCE_MSG 4093 4094 You will probably want to define these to avoid a really noisy system 4095 when storing the env in UBI. 4096 4097- CONFIG_ENV_IS_IN_FAT: 4098 Define this if you want to use the FAT file system for the environment. 4099 4100 - FAT_ENV_INTERFACE: 4101 4102 Define this to a string that is the name of the block device. 4103 4104 - FAT_ENV_DEVICE_AND_PART: 4105 4106 Define this to a string to specify the partition of the device. It can 4107 be as following: 4108 4109 "D:P", "D:0", "D", "D:" or "D:auto" (D, P are integers. And P >= 1) 4110 - "D:P": device D partition P. Error occurs if device D has no 4111 partition table. 4112 - "D:0": device D. 4113 - "D" or "D:": device D partition 1 if device D has partition 4114 table, or the whole device D if has no partition 4115 table. 4116 - "D:auto": first partition in device D with bootable flag set. 4117 If none, first valid partition in device D. If no 4118 partition table then means device D. 4119 4120 - FAT_ENV_FILE: 4121 4122 It's a string of the FAT file name. This file use to store the 4123 environment. 4124 4125 - CONFIG_FAT_WRITE: 4126 This should be defined. Otherwise it cannot save the environment file. 4127 4128- CONFIG_ENV_IS_IN_MMC: 4129 4130 Define this if you have an MMC device which you want to use for the 4131 environment. 4132 4133 - CONFIG_SYS_MMC_ENV_DEV: 4134 4135 Specifies which MMC device the environment is stored in. 4136 4137 - CONFIG_SYS_MMC_ENV_PART (optional): 4138 4139 Specifies which MMC partition the environment is stored in. If not 4140 set, defaults to partition 0, the user area. Common values might be 4141 1 (first MMC boot partition), 2 (second MMC boot partition). 4142 4143 - CONFIG_ENV_OFFSET: 4144 - CONFIG_ENV_SIZE: 4145 4146 These two #defines specify the offset and size of the environment 4147 area within the specified MMC device. 4148 4149 If offset is positive (the usual case), it is treated as relative to 4150 the start of the MMC partition. If offset is negative, it is treated 4151 as relative to the end of the MMC partition. This can be useful if 4152 your board may be fitted with different MMC devices, which have 4153 different sizes for the MMC partitions, and you always want the 4154 environment placed at the very end of the partition, to leave the 4155 maximum possible space before it, to store other data. 4156 4157 These two values are in units of bytes, but must be aligned to an 4158 MMC sector boundary. 4159 4160 - CONFIG_ENV_OFFSET_REDUND (optional): 4161 4162 Specifies a second storage area, of CONFIG_ENV_SIZE size, used to 4163 hold a redundant copy of the environment data. This provides a 4164 valid backup copy in case the other copy is corrupted, e.g. due 4165 to a power failure during a "saveenv" operation. 4166 4167 This value may also be positive or negative; this is handled in the 4168 same way as CONFIG_ENV_OFFSET. 4169 4170 This value is also in units of bytes, but must also be aligned to 4171 an MMC sector boundary. 4172 4173 - CONFIG_ENV_SIZE_REDUND (optional): 4174 4175 This value need not be set, even when CONFIG_ENV_OFFSET_REDUND is 4176 set. If this value is set, it must be set to the same value as 4177 CONFIG_ENV_SIZE. 4178 4179- CONFIG_SYS_SPI_INIT_OFFSET 4180 4181 Defines offset to the initial SPI buffer area in DPRAM. The 4182 area is used at an early stage (ROM part) if the environment 4183 is configured to reside in the SPI EEPROM: We need a 520 byte 4184 scratch DPRAM area. It is used between the two initialization 4185 calls (spi_init_f() and spi_init_r()). A value of 0xB00 seems 4186 to be a good choice since it makes it far enough from the 4187 start of the data area as well as from the stack pointer. 4188 4189Please note that the environment is read-only until the monitor 4190has been relocated to RAM and a RAM copy of the environment has been 4191created; also, when using EEPROM you will have to use getenv_f() 4192until then to read environment variables. 4193 4194The environment is protected by a CRC32 checksum. Before the monitor 4195is relocated into RAM, as a result of a bad CRC you will be working 4196with the compiled-in default environment - *silently*!!! [This is 4197necessary, because the first environment variable we need is the 4198"baudrate" setting for the console - if we have a bad CRC, we don't 4199have any device yet where we could complain.] 4200 4201Note: once the monitor has been relocated, then it will complain if 4202the default environment is used; a new CRC is computed as soon as you 4203use the "saveenv" command to store a valid environment. 4204 4205- CONFIG_SYS_FAULT_ECHO_LINK_DOWN: 4206 Echo the inverted Ethernet link state to the fault LED. 4207 4208 Note: If this option is active, then CONFIG_SYS_FAULT_MII_ADDR 4209 also needs to be defined. 4210 4211- CONFIG_SYS_FAULT_MII_ADDR: 4212 MII address of the PHY to check for the Ethernet link state. 4213 4214- CONFIG_NS16550_MIN_FUNCTIONS: 4215 Define this if you desire to only have use of the NS16550_init 4216 and NS16550_putc functions for the serial driver located at 4217 drivers/serial/ns16550.c. This option is useful for saving 4218 space for already greatly restricted images, including but not 4219 limited to NAND_SPL configurations. 4220 4221- CONFIG_DISPLAY_BOARDINFO 4222 Display information about the board that U-Boot is running on 4223 when U-Boot starts up. The board function checkboard() is called 4224 to do this. 4225 4226- CONFIG_DISPLAY_BOARDINFO_LATE 4227 Similar to the previous option, but display this information 4228 later, once stdio is running and output goes to the LCD, if 4229 present. 4230 4231- CONFIG_BOARD_SIZE_LIMIT: 4232 Maximum size of the U-Boot image. When defined, the 4233 build system checks that the actual size does not 4234 exceed it. 4235 4236Low Level (hardware related) configuration options: 4237--------------------------------------------------- 4238 4239- CONFIG_SYS_CACHELINE_SIZE: 4240 Cache Line Size of the CPU. 4241 4242- CONFIG_SYS_DEFAULT_IMMR: 4243 Default address of the IMMR after system reset. 4244 4245 Needed on some 8260 systems (MPC8260ADS, PQ2FADS-ZU, 4246 and RPXsuper) to be able to adjust the position of 4247 the IMMR register after a reset. 4248 4249- CONFIG_SYS_CCSRBAR_DEFAULT: 4250 Default (power-on reset) physical address of CCSR on Freescale 4251 PowerPC SOCs. 4252 4253- CONFIG_SYS_CCSRBAR: 4254 Virtual address of CCSR. On a 32-bit build, this is typically 4255 the same value as CONFIG_SYS_CCSRBAR_DEFAULT. 4256 4257 CONFIG_SYS_DEFAULT_IMMR must also be set to this value, 4258 for cross-platform code that uses that macro instead. 4259 4260- CONFIG_SYS_CCSRBAR_PHYS: 4261 Physical address of CCSR. CCSR can be relocated to a new 4262 physical address, if desired. In this case, this macro should 4263 be set to that address. Otherwise, it should be set to the 4264 same value as CONFIG_SYS_CCSRBAR_DEFAULT. For example, CCSR 4265 is typically relocated on 36-bit builds. It is recommended 4266 that this macro be defined via the _HIGH and _LOW macros: 4267 4268 #define CONFIG_SYS_CCSRBAR_PHYS ((CONFIG_SYS_CCSRBAR_PHYS_HIGH 4269 * 1ull) << 32 | CONFIG_SYS_CCSRBAR_PHYS_LOW) 4270 4271- CONFIG_SYS_CCSRBAR_PHYS_HIGH: 4272 Bits 33-36 of CONFIG_SYS_CCSRBAR_PHYS. This value is typically 4273 either 0 (32-bit build) or 0xF (36-bit build). This macro is 4274 used in assembly code, so it must not contain typecasts or 4275 integer size suffixes (e.g. "ULL"). 4276 4277- CONFIG_SYS_CCSRBAR_PHYS_LOW: 4278 Lower 32-bits of CONFIG_SYS_CCSRBAR_PHYS. This macro is 4279 used in assembly code, so it must not contain typecasts or 4280 integer size suffixes (e.g. "ULL"). 4281 4282- CONFIG_SYS_CCSR_DO_NOT_RELOCATE: 4283 If this macro is defined, then CONFIG_SYS_CCSRBAR_PHYS will be 4284 forced to a value that ensures that CCSR is not relocated. 4285 4286- Floppy Disk Support: 4287 CONFIG_SYS_FDC_DRIVE_NUMBER 4288 4289 the default drive number (default value 0) 4290 4291 CONFIG_SYS_ISA_IO_STRIDE 4292 4293 defines the spacing between FDC chipset registers 4294 (default value 1) 4295 4296 CONFIG_SYS_ISA_IO_OFFSET 4297 4298 defines the offset of register from address. It 4299 depends on which part of the data bus is connected to 4300 the FDC chipset. (default value 0) 4301 4302 If CONFIG_SYS_ISA_IO_STRIDE CONFIG_SYS_ISA_IO_OFFSET and 4303 CONFIG_SYS_FDC_DRIVE_NUMBER are undefined, they take their 4304 default value. 4305 4306 if CONFIG_SYS_FDC_HW_INIT is defined, then the function 4307 fdc_hw_init() is called at the beginning of the FDC 4308 setup. fdc_hw_init() must be provided by the board 4309 source code. It is used to make hardware-dependent 4310 initializations. 4311 4312- CONFIG_IDE_AHB: 4313 Most IDE controllers were designed to be connected with PCI 4314 interface. Only few of them were designed for AHB interface. 4315 When software is doing ATA command and data transfer to 4316 IDE devices through IDE-AHB controller, some additional 4317 registers accessing to these kind of IDE-AHB controller 4318 is required. 4319 4320- CONFIG_SYS_IMMR: Physical address of the Internal Memory. 4321 DO NOT CHANGE unless you know exactly what you're 4322 doing! (11-4) [MPC8xx/82xx systems only] 4323 4324- CONFIG_SYS_INIT_RAM_ADDR: 4325 4326 Start address of memory area that can be used for 4327 initial data and stack; please note that this must be 4328 writable memory that is working WITHOUT special 4329 initialization, i. e. you CANNOT use normal RAM which 4330 will become available only after programming the 4331 memory controller and running certain initialization 4332 sequences. 4333 4334 U-Boot uses the following memory types: 4335 - MPC8xx and MPC8260: IMMR (internal memory of the CPU) 4336 - MPC824X: data cache 4337 - PPC4xx: data cache 4338 4339- CONFIG_SYS_GBL_DATA_OFFSET: 4340 4341 Offset of the initial data structure in the memory 4342 area defined by CONFIG_SYS_INIT_RAM_ADDR. Usually 4343 CONFIG_SYS_GBL_DATA_OFFSET is chosen such that the initial 4344 data is located at the end of the available space 4345 (sometimes written as (CONFIG_SYS_INIT_RAM_SIZE - 4346 GENERATED_GBL_DATA_SIZE), and the initial stack is just 4347 below that area (growing from (CONFIG_SYS_INIT_RAM_ADDR + 4348 CONFIG_SYS_GBL_DATA_OFFSET) downward. 4349 4350 Note: 4351 On the MPC824X (or other systems that use the data 4352 cache for initial memory) the address chosen for 4353 CONFIG_SYS_INIT_RAM_ADDR is basically arbitrary - it must 4354 point to an otherwise UNUSED address space between 4355 the top of RAM and the start of the PCI space. 4356 4357- CONFIG_SYS_SIUMCR: SIU Module Configuration (11-6) 4358 4359- CONFIG_SYS_SYPCR: System Protection Control (11-9) 4360 4361- CONFIG_SYS_TBSCR: Time Base Status and Control (11-26) 4362 4363- CONFIG_SYS_PISCR: Periodic Interrupt Status and Control (11-31) 4364 4365- CONFIG_SYS_PLPRCR: PLL, Low-Power, and Reset Control Register (15-30) 4366 4367- CONFIG_SYS_SCCR: System Clock and reset Control Register (15-27) 4368 4369- CONFIG_SYS_OR_TIMING_SDRAM: 4370 SDRAM timing 4371 4372- CONFIG_SYS_MAMR_PTA: 4373 periodic timer for refresh 4374 4375- CONFIG_SYS_DER: Debug Event Register (37-47) 4376 4377- FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CONFIG_SYS_REMAP_OR_AM, 4378 CONFIG_SYS_PRELIM_OR_AM, CONFIG_SYS_OR_TIMING_FLASH, CONFIG_SYS_OR0_REMAP, 4379 CONFIG_SYS_OR0_PRELIM, CONFIG_SYS_BR0_PRELIM, CONFIG_SYS_OR1_REMAP, CONFIG_SYS_OR1_PRELIM, 4380 CONFIG_SYS_BR1_PRELIM: 4381 Memory Controller Definitions: BR0/1 and OR0/1 (FLASH) 4382 4383- SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE, 4384 CONFIG_SYS_OR_TIMING_SDRAM, CONFIG_SYS_OR2_PRELIM, CONFIG_SYS_BR2_PRELIM, 4385 CONFIG_SYS_OR3_PRELIM, CONFIG_SYS_BR3_PRELIM: 4386 Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM) 4387 4388- CONFIG_SYS_MAMR_PTA, CONFIG_SYS_MPTPR_2BK_4K, CONFIG_SYS_MPTPR_1BK_4K, CONFIG_SYS_MPTPR_2BK_8K, 4389 CONFIG_SYS_MPTPR_1BK_8K, CONFIG_SYS_MAMR_8COL, CONFIG_SYS_MAMR_9COL: 4390 Machine Mode Register and Memory Periodic Timer 4391 Prescaler definitions (SDRAM timing) 4392 4393- CONFIG_SYS_I2C_UCODE_PATCH, CONFIG_SYS_I2C_DPMEM_OFFSET [0x1FC0]: 4394 enable I2C microcode relocation patch (MPC8xx); 4395 define relocation offset in DPRAM [DSP2] 4396 4397- CONFIG_SYS_SMC_UCODE_PATCH, CONFIG_SYS_SMC_DPMEM_OFFSET [0x1FC0]: 4398 enable SMC microcode relocation patch (MPC8xx); 4399 define relocation offset in DPRAM [SMC1] 4400 4401- CONFIG_SYS_SPI_UCODE_PATCH, CONFIG_SYS_SPI_DPMEM_OFFSET [0x1FC0]: 4402 enable SPI microcode relocation patch (MPC8xx); 4403 define relocation offset in DPRAM [SCC4] 4404 4405- CONFIG_SYS_CPM_POST_WORD_ADDR: (MPC8xx, MPC8260 only) 4406 Offset of the bootmode word in DPRAM used by post 4407 (Power On Self Tests). This definition overrides 4408 #define'd default value in commproc.h resp. 4409 cpm_8260.h. 4410 4411- CONFIG_SYS_PCI_SLV_MEM_LOCAL, CONFIG_SYS_PCI_SLV_MEM_BUS, CONFIG_SYS_PICMR0_MASK_ATTRIB, 4412 CONFIG_SYS_PCI_MSTR0_LOCAL, CONFIG_SYS_PCIMSK0_MASK, CONFIG_SYS_PCI_MSTR1_LOCAL, 4413 CONFIG_SYS_PCIMSK1_MASK, CONFIG_SYS_PCI_MSTR_MEM_LOCAL, CONFIG_SYS_PCI_MSTR_MEM_BUS, 4414 CONFIG_SYS_CPU_PCI_MEM_START, CONFIG_SYS_PCI_MSTR_MEM_SIZE, CONFIG_SYS_POCMR0_MASK_ATTRIB, 4415 CONFIG_SYS_PCI_MSTR_MEMIO_LOCAL, CONFIG_SYS_PCI_MSTR_MEMIO_BUS, CPU_PCI_MEMIO_START, 4416 CONFIG_SYS_PCI_MSTR_MEMIO_SIZE, CONFIG_SYS_POCMR1_MASK_ATTRIB, CONFIG_SYS_PCI_MSTR_IO_LOCAL, 4417 CONFIG_SYS_PCI_MSTR_IO_BUS, CONFIG_SYS_CPU_PCI_IO_START, CONFIG_SYS_PCI_MSTR_IO_SIZE, 4418 CONFIG_SYS_POCMR2_MASK_ATTRIB: (MPC826x only) 4419 Overrides the default PCI memory map in arch/powerpc/cpu/mpc8260/pci.c if set. 4420 4421- CONFIG_PCI_DISABLE_PCIE: 4422 Disable PCI-Express on systems where it is supported but not 4423 required. 4424 4425- CONFIG_PCI_ENUM_ONLY 4426 Only scan through and get the devices on the buses. 4427 Don't do any setup work, presumably because someone or 4428 something has already done it, and we don't need to do it 4429 a second time. Useful for platforms that are pre-booted 4430 by coreboot or similar. 4431 4432- CONFIG_PCI_INDIRECT_BRIDGE: 4433 Enable support for indirect PCI bridges. 4434 4435- CONFIG_SYS_SRIO: 4436 Chip has SRIO or not 4437 4438- CONFIG_SRIO1: 4439 Board has SRIO 1 port available 4440 4441- CONFIG_SRIO2: 4442 Board has SRIO 2 port available 4443 4444- CONFIG_SRIO_PCIE_BOOT_MASTER 4445 Board can support master function for Boot from SRIO and PCIE 4446 4447- CONFIG_SYS_SRIOn_MEM_VIRT: 4448 Virtual Address of SRIO port 'n' memory region 4449 4450- CONFIG_SYS_SRIOn_MEM_PHYS: 4451 Physical Address of SRIO port 'n' memory region 4452 4453- CONFIG_SYS_SRIOn_MEM_SIZE: 4454 Size of SRIO port 'n' memory region 4455 4456- CONFIG_SYS_NAND_BUSWIDTH_16BIT 4457 Defined to tell the NAND controller that the NAND chip is using 4458 a 16 bit bus. 4459 Not all NAND drivers use this symbol. 4460 Example of drivers that use it: 4461 - drivers/mtd/nand/ndfc.c 4462 - drivers/mtd/nand/mxc_nand.c 4463 4464- CONFIG_SYS_NDFC_EBC0_CFG 4465 Sets the EBC0_CFG register for the NDFC. If not defined 4466 a default value will be used. 4467 4468- CONFIG_SPD_EEPROM 4469 Get DDR timing information from an I2C EEPROM. Common 4470 with pluggable memory modules such as SODIMMs 4471 4472 SPD_EEPROM_ADDRESS 4473 I2C address of the SPD EEPROM 4474 4475- CONFIG_SYS_SPD_BUS_NUM 4476 If SPD EEPROM is on an I2C bus other than the first 4477 one, specify here. Note that the value must resolve 4478 to something your driver can deal with. 4479 4480- CONFIG_SYS_DDR_RAW_TIMING 4481 Get DDR timing information from other than SPD. Common with 4482 soldered DDR chips onboard without SPD. DDR raw timing 4483 parameters are extracted from datasheet and hard-coded into 4484 header files or board specific files. 4485 4486- CONFIG_FSL_DDR_INTERACTIVE 4487 Enable interactive DDR debugging. See doc/README.fsl-ddr. 4488 4489- CONFIG_FSL_DDR_SYNC_REFRESH 4490 Enable sync of refresh for multiple controllers. 4491 4492- CONFIG_FSL_DDR_BIST 4493 Enable built-in memory test for Freescale DDR controllers. 4494 4495- CONFIG_SYS_83XX_DDR_USES_CS0 4496 Only for 83xx systems. If specified, then DDR should 4497 be configured using CS0 and CS1 instead of CS2 and CS3. 4498 4499- CONFIG_ETHER_ON_FEC[12] 4500 Define to enable FEC[12] on a 8xx series processor. 4501 4502- CONFIG_FEC[12]_PHY 4503 Define to the hardcoded PHY address which corresponds 4504 to the given FEC; i. e. 4505 #define CONFIG_FEC1_PHY 4 4506 means that the PHY with address 4 is connected to FEC1 4507 4508 When set to -1, means to probe for first available. 4509 4510- CONFIG_FEC[12]_PHY_NORXERR 4511 The PHY does not have a RXERR line (RMII only). 4512 (so program the FEC to ignore it). 4513 4514- CONFIG_RMII 4515 Enable RMII mode for all FECs. 4516 Note that this is a global option, we can't 4517 have one FEC in standard MII mode and another in RMII mode. 4518 4519- CONFIG_CRC32_VERIFY 4520 Add a verify option to the crc32 command. 4521 The syntax is: 4522 4523 => crc32 -v <address> <count> <crc32> 4524 4525 Where address/count indicate a memory area 4526 and crc32 is the correct crc32 which the 4527 area should have. 4528 4529- CONFIG_LOOPW 4530 Add the "loopw" memory command. This only takes effect if 4531 the memory commands are activated globally (CONFIG_CMD_MEM). 4532 4533- CONFIG_MX_CYCLIC 4534 Add the "mdc" and "mwc" memory commands. These are cyclic 4535 "md/mw" commands. 4536 Examples: 4537 4538 => mdc.b 10 4 500 4539 This command will print 4 bytes (10,11,12,13) each 500 ms. 4540 4541 => mwc.l 100 12345678 10 4542 This command will write 12345678 to address 100 all 10 ms. 4543 4544 This only takes effect if the memory commands are activated 4545 globally (CONFIG_CMD_MEM). 4546 4547- CONFIG_SKIP_LOWLEVEL_INIT 4548 [ARM, NDS32, MIPS only] If this variable is defined, then certain 4549 low level initializations (like setting up the memory 4550 controller) are omitted and/or U-Boot does not 4551 relocate itself into RAM. 4552 4553 Normally this variable MUST NOT be defined. The only 4554 exception is when U-Boot is loaded (to RAM) by some 4555 other boot loader or by a debugger which performs 4556 these initializations itself. 4557 4558- CONFIG_SKIP_LOWLEVEL_INIT_ONLY 4559 [ARM926EJ-S only] This allows just the call to lowlevel_init() 4560 to be skipped. The normal CP15 init (such as enabling the 4561 instruction cache) is still performed. 4562 4563- CONFIG_SPL_BUILD 4564 Modifies the behaviour of start.S when compiling a loader 4565 that is executed before the actual U-Boot. E.g. when 4566 compiling a NAND SPL. 4567 4568- CONFIG_TPL_BUILD 4569 Modifies the behaviour of start.S when compiling a loader 4570 that is executed after the SPL and before the actual U-Boot. 4571 It is loaded by the SPL. 4572 4573- CONFIG_SYS_MPC85XX_NO_RESETVEC 4574 Only for 85xx systems. If this variable is specified, the section 4575 .resetvec is not kept and the section .bootpg is placed in the 4576 previous 4k of the .text section. 4577 4578- CONFIG_ARCH_MAP_SYSMEM 4579 Generally U-Boot (and in particular the md command) uses 4580 effective address. It is therefore not necessary to regard 4581 U-Boot address as virtual addresses that need to be translated 4582 to physical addresses. However, sandbox requires this, since 4583 it maintains its own little RAM buffer which contains all 4584 addressable memory. This option causes some memory accesses 4585 to be mapped through map_sysmem() / unmap_sysmem(). 4586 4587- CONFIG_X86_RESET_VECTOR 4588 If defined, the x86 reset vector code is included. This is not 4589 needed when U-Boot is running from Coreboot. 4590 4591- CONFIG_SYS_MPUCLK 4592 Defines the MPU clock speed (in MHz). 4593 4594 NOTE : currently only supported on AM335x platforms. 4595 4596- CONFIG_SPL_AM33XX_ENABLE_RTC32K_OSC: 4597 Enables the RTC32K OSC on AM33xx based plattforms 4598 4599- CONFIG_SYS_NAND_NO_SUBPAGE_WRITE 4600 Option to disable subpage write in NAND driver 4601 driver that uses this: 4602 drivers/mtd/nand/davinci_nand.c 4603 4604Freescale QE/FMAN Firmware Support: 4605----------------------------------- 4606 4607The Freescale QUICCEngine (QE) and Frame Manager (FMAN) both support the 4608loading of "firmware", which is encoded in the QE firmware binary format. 4609This firmware often needs to be loaded during U-Boot booting, so macros 4610are used to identify the storage device (NOR flash, SPI, etc) and the address 4611within that device. 4612 4613- CONFIG_SYS_FMAN_FW_ADDR 4614 The address in the storage device where the FMAN microcode is located. The 4615 meaning of this address depends on which CONFIG_SYS_QE_FW_IN_xxx macro 4616 is also specified. 4617 4618- CONFIG_SYS_QE_FW_ADDR 4619 The address in the storage device where the QE microcode is located. The 4620 meaning of this address depends on which CONFIG_SYS_QE_FW_IN_xxx macro 4621 is also specified. 4622 4623- CONFIG_SYS_QE_FMAN_FW_LENGTH 4624 The maximum possible size of the firmware. The firmware binary format 4625 has a field that specifies the actual size of the firmware, but it 4626 might not be possible to read any part of the firmware unless some 4627 local storage is allocated to hold the entire firmware first. 4628 4629- CONFIG_SYS_QE_FMAN_FW_IN_NOR 4630 Specifies that QE/FMAN firmware is located in NOR flash, mapped as 4631 normal addressable memory via the LBC. CONFIG_SYS_FMAN_FW_ADDR is the 4632 virtual address in NOR flash. 4633 4634- CONFIG_SYS_QE_FMAN_FW_IN_NAND 4635 Specifies that QE/FMAN firmware is located in NAND flash. 4636 CONFIG_SYS_FMAN_FW_ADDR is the offset within NAND flash. 4637 4638- CONFIG_SYS_QE_FMAN_FW_IN_MMC 4639 Specifies that QE/FMAN firmware is located on the primary SD/MMC 4640 device. CONFIG_SYS_FMAN_FW_ADDR is the byte offset on that device. 4641 4642- CONFIG_SYS_QE_FMAN_FW_IN_REMOTE 4643 Specifies that QE/FMAN firmware is located in the remote (master) 4644 memory space. CONFIG_SYS_FMAN_FW_ADDR is a virtual address which 4645 can be mapped from slave TLB->slave LAW->slave SRIO or PCIE outbound 4646 window->master inbound window->master LAW->the ucode address in 4647 master's memory space. 4648 4649Freescale Layerscape Management Complex Firmware Support: 4650--------------------------------------------------------- 4651The Freescale Layerscape Management Complex (MC) supports the loading of 4652"firmware". 4653This firmware often needs to be loaded during U-Boot booting, so macros 4654are used to identify the storage device (NOR flash, SPI, etc) and the address 4655within that device. 4656 4657- CONFIG_FSL_MC_ENET 4658 Enable the MC driver for Layerscape SoCs. 4659 4660Freescale Layerscape Debug Server Support: 4661------------------------------------------- 4662The Freescale Layerscape Debug Server Support supports the loading of 4663"Debug Server firmware" and triggering SP boot-rom. 4664This firmware often needs to be loaded during U-Boot booting. 4665 4666- CONFIG_SYS_MC_RSV_MEM_ALIGN 4667 Define alignment of reserved memory MC requires 4668 4669Reproducible builds 4670------------------- 4671 4672In order to achieve reproducible builds, timestamps used in the U-Boot build 4673process have to be set to a fixed value. 4674 4675This is done using the SOURCE_DATE_EPOCH environment variable. 4676SOURCE_DATE_EPOCH is to be set on the build host's shell, not as a configuration 4677option for U-Boot or an environment variable in U-Boot. 4678 4679SOURCE_DATE_EPOCH should be set to a number of seconds since the epoch, in UTC. 4680 4681Building the Software: 4682====================== 4683 4684Building U-Boot has been tested in several native build environments 4685and in many different cross environments. Of course we cannot support 4686all possibly existing versions of cross development tools in all 4687(potentially obsolete) versions. In case of tool chain problems we 4688recommend to use the ELDK (see http://www.denx.de/wiki/DULG/ELDK) 4689which is extensively used to build and test U-Boot. 4690 4691If you are not using a native environment, it is assumed that you 4692have GNU cross compiling tools available in your path. In this case, 4693you must set the environment variable CROSS_COMPILE in your shell. 4694Note that no changes to the Makefile or any other source files are 4695necessary. For example using the ELDK on a 4xx CPU, please enter: 4696 4697 $ CROSS_COMPILE=ppc_4xx- 4698 $ export CROSS_COMPILE 4699 4700Note: If you wish to generate Windows versions of the utilities in 4701 the tools directory you can use the MinGW toolchain 4702 (http://www.mingw.org). Set your HOST tools to the MinGW 4703 toolchain and execute 'make tools'. For example: 4704 4705 $ make HOSTCC=i586-mingw32msvc-gcc HOSTSTRIP=i586-mingw32msvc-strip tools 4706 4707 Binaries such as tools/mkimage.exe will be created which can 4708 be executed on computers running Windows. 4709 4710U-Boot is intended to be simple to build. After installing the 4711sources you must configure U-Boot for one specific board type. This 4712is done by typing: 4713 4714 make NAME_defconfig 4715 4716where "NAME_defconfig" is the name of one of the existing configu- 4717rations; see boards.cfg for supported names. 4718 4719Note: for some board special configuration names may exist; check if 4720 additional information is available from the board vendor; for 4721 instance, the TQM823L systems are available without (standard) 4722 or with LCD support. You can select such additional "features" 4723 when choosing the configuration, i. e. 4724 4725 make TQM823L_defconfig 4726 - will configure for a plain TQM823L, i. e. no LCD support 4727 4728 make TQM823L_LCD_defconfig 4729 - will configure for a TQM823L with U-Boot console on LCD 4730 4731 etc. 4732 4733 4734Finally, type "make all", and you should get some working U-Boot 4735images ready for download to / installation on your system: 4736 4737- "u-boot.bin" is a raw binary image 4738- "u-boot" is an image in ELF binary format 4739- "u-boot.srec" is in Motorola S-Record format 4740 4741By default the build is performed locally and the objects are saved 4742in the source directory. One of the two methods can be used to change 4743this behavior and build U-Boot to some external directory: 4744 47451. Add O= to the make command line invocations: 4746 4747 make O=/tmp/build distclean 4748 make O=/tmp/build NAME_defconfig 4749 make O=/tmp/build all 4750 47512. Set environment variable KBUILD_OUTPUT to point to the desired location: 4752 4753 export KBUILD_OUTPUT=/tmp/build 4754 make distclean 4755 make NAME_defconfig 4756 make all 4757 4758Note that the command line "O=" setting overrides the KBUILD_OUTPUT environment 4759variable. 4760 4761 4762Please be aware that the Makefiles assume you are using GNU make, so 4763for instance on NetBSD you might need to use "gmake" instead of 4764native "make". 4765 4766 4767If the system board that you have is not listed, then you will need 4768to port U-Boot to your hardware platform. To do this, follow these 4769steps: 4770 47711. Create a new directory to hold your board specific code. Add any 4772 files you need. In your board directory, you will need at least 4773 the "Makefile" and a "<board>.c". 47742. Create a new configuration file "include/configs/<board>.h" for 4775 your board. 47763. If you're porting U-Boot to a new CPU, then also create a new 4777 directory to hold your CPU specific code. Add any files you need. 47784. Run "make <board>_defconfig" with your new name. 47795. Type "make", and you should get a working "u-boot.srec" file 4780 to be installed on your target system. 47816. Debug and solve any problems that might arise. 4782 [Of course, this last step is much harder than it sounds.] 4783 4784 4785Testing of U-Boot Modifications, Ports to New Hardware, etc.: 4786============================================================== 4787 4788If you have modified U-Boot sources (for instance added a new board 4789or support for new devices, a new CPU, etc.) you are expected to 4790provide feedback to the other developers. The feedback normally takes 4791the form of a "patch", i. e. a context diff against a certain (latest 4792official or latest in the git repository) version of U-Boot sources. 4793 4794But before you submit such a patch, please verify that your modifi- 4795cation did not break existing code. At least make sure that *ALL* of 4796the supported boards compile WITHOUT ANY compiler warnings. To do so, 4797just run the buildman script (tools/buildman/buildman), which will 4798configure and build U-Boot for ALL supported system. Be warned, this 4799will take a while. Please see the buildman README, or run 'buildman -H' 4800for documentation. 4801 4802 4803See also "U-Boot Porting Guide" below. 4804 4805 4806Monitor Commands - Overview: 4807============================ 4808 4809go - start application at address 'addr' 4810run - run commands in an environment variable 4811bootm - boot application image from memory 4812bootp - boot image via network using BootP/TFTP protocol 4813bootz - boot zImage from memory 4814tftpboot- boot image via network using TFTP protocol 4815 and env variables "ipaddr" and "serverip" 4816 (and eventually "gatewayip") 4817tftpput - upload a file via network using TFTP protocol 4818rarpboot- boot image via network using RARP/TFTP protocol 4819diskboot- boot from IDE devicebootd - boot default, i.e., run 'bootcmd' 4820loads - load S-Record file over serial line 4821loadb - load binary file over serial line (kermit mode) 4822md - memory display 4823mm - memory modify (auto-incrementing) 4824nm - memory modify (constant address) 4825mw - memory write (fill) 4826cp - memory copy 4827cmp - memory compare 4828crc32 - checksum calculation 4829i2c - I2C sub-system 4830sspi - SPI utility commands 4831base - print or set address offset 4832printenv- print environment variables 4833setenv - set environment variables 4834saveenv - save environment variables to persistent storage 4835protect - enable or disable FLASH write protection 4836erase - erase FLASH memory 4837flinfo - print FLASH memory information 4838nand - NAND memory operations (see doc/README.nand) 4839bdinfo - print Board Info structure 4840iminfo - print header information for application image 4841coninfo - print console devices and informations 4842ide - IDE sub-system 4843loop - infinite loop on address range 4844loopw - infinite write loop on address range 4845mtest - simple RAM test 4846icache - enable or disable instruction cache 4847dcache - enable or disable data cache 4848reset - Perform RESET of the CPU 4849echo - echo args to console 4850version - print monitor version 4851help - print online help 4852? - alias for 'help' 4853 4854 4855Monitor Commands - Detailed Description: 4856======================================== 4857 4858TODO. 4859 4860For now: just type "help <command>". 4861 4862 4863Environment Variables: 4864====================== 4865 4866U-Boot supports user configuration using Environment Variables which 4867can be made persistent by saving to Flash memory. 4868 4869Environment Variables are set using "setenv", printed using 4870"printenv", and saved to Flash using "saveenv". Using "setenv" 4871without a value can be used to delete a variable from the 4872environment. As long as you don't save the environment you are 4873working with an in-memory copy. In case the Flash area containing the 4874environment is erased by accident, a default environment is provided. 4875 4876Some configuration options can be set using Environment Variables. 4877 4878List of environment variables (most likely not complete): 4879 4880 baudrate - see CONFIG_BAUDRATE 4881 4882 bootdelay - see CONFIG_BOOTDELAY 4883 4884 bootcmd - see CONFIG_BOOTCOMMAND 4885 4886 bootargs - Boot arguments when booting an RTOS image 4887 4888 bootfile - Name of the image to load with TFTP 4889 4890 bootm_low - Memory range available for image processing in the bootm 4891 command can be restricted. This variable is given as 4892 a hexadecimal number and defines lowest address allowed 4893 for use by the bootm command. See also "bootm_size" 4894 environment variable. Address defined by "bootm_low" is 4895 also the base of the initial memory mapping for the Linux 4896 kernel -- see the description of CONFIG_SYS_BOOTMAPSZ and 4897 bootm_mapsize. 4898 4899 bootm_mapsize - Size of the initial memory mapping for the Linux kernel. 4900 This variable is given as a hexadecimal number and it 4901 defines the size of the memory region starting at base 4902 address bootm_low that is accessible by the Linux kernel 4903 during early boot. If unset, CONFIG_SYS_BOOTMAPSZ is used 4904 as the default value if it is defined, and bootm_size is 4905 used otherwise. 4906 4907 bootm_size - Memory range available for image processing in the bootm 4908 command can be restricted. This variable is given as 4909 a hexadecimal number and defines the size of the region 4910 allowed for use by the bootm command. See also "bootm_low" 4911 environment variable. 4912 4913 updatefile - Location of the software update file on a TFTP server, used 4914 by the automatic software update feature. Please refer to 4915 documentation in doc/README.update for more details. 4916 4917 autoload - if set to "no" (any string beginning with 'n'), 4918 "bootp" will just load perform a lookup of the 4919 configuration from the BOOTP server, but not try to 4920 load any image using TFTP 4921 4922 autostart - if set to "yes", an image loaded using the "bootp", 4923 "rarpboot", "tftpboot" or "diskboot" commands will 4924 be automatically started (by internally calling 4925 "bootm") 4926 4927 If set to "no", a standalone image passed to the 4928 "bootm" command will be copied to the load address 4929 (and eventually uncompressed), but NOT be started. 4930 This can be used to load and uncompress arbitrary 4931 data. 4932 4933 fdt_high - if set this restricts the maximum address that the 4934 flattened device tree will be copied into upon boot. 4935 For example, if you have a system with 1 GB memory 4936 at physical address 0x10000000, while Linux kernel 4937 only recognizes the first 704 MB as low memory, you 4938 may need to set fdt_high as 0x3C000000 to have the 4939 device tree blob be copied to the maximum address 4940 of the 704 MB low memory, so that Linux kernel can 4941 access it during the boot procedure. 4942 4943 If this is set to the special value 0xFFFFFFFF then 4944 the fdt will not be copied at all on boot. For this 4945 to work it must reside in writable memory, have 4946 sufficient padding on the end of it for u-boot to 4947 add the information it needs into it, and the memory 4948 must be accessible by the kernel. 4949 4950 fdtcontroladdr- if set this is the address of the control flattened 4951 device tree used by U-Boot when CONFIG_OF_CONTROL is 4952 defined. 4953 4954 i2cfast - (PPC405GP|PPC405EP only) 4955 if set to 'y' configures Linux I2C driver for fast 4956 mode (400kHZ). This environment variable is used in 4957 initialization code. So, for changes to be effective 4958 it must be saved and board must be reset. 4959 4960 initrd_high - restrict positioning of initrd images: 4961 If this variable is not set, initrd images will be 4962 copied to the highest possible address in RAM; this 4963 is usually what you want since it allows for 4964 maximum initrd size. If for some reason you want to 4965 make sure that the initrd image is loaded below the 4966 CONFIG_SYS_BOOTMAPSZ limit, you can set this environment 4967 variable to a value of "no" or "off" or "0". 4968 Alternatively, you can set it to a maximum upper 4969 address to use (U-Boot will still check that it 4970 does not overwrite the U-Boot stack and data). 4971 4972 For instance, when you have a system with 16 MB 4973 RAM, and want to reserve 4 MB from use by Linux, 4974 you can do this by adding "mem=12M" to the value of 4975 the "bootargs" variable. However, now you must make 4976 sure that the initrd image is placed in the first 4977 12 MB as well - this can be done with 4978 4979 setenv initrd_high 00c00000 4980 4981 If you set initrd_high to 0xFFFFFFFF, this is an 4982 indication to U-Boot that all addresses are legal 4983 for the Linux kernel, including addresses in flash 4984 memory. In this case U-Boot will NOT COPY the 4985 ramdisk at all. This may be useful to reduce the 4986 boot time on your system, but requires that this 4987 feature is supported by your Linux kernel. 4988 4989 ipaddr - IP address; needed for tftpboot command 4990 4991 loadaddr - Default load address for commands like "bootp", 4992 "rarpboot", "tftpboot", "loadb" or "diskboot" 4993 4994 loads_echo - see CONFIG_LOADS_ECHO 4995 4996 serverip - TFTP server IP address; needed for tftpboot command 4997 4998 bootretry - see CONFIG_BOOT_RETRY_TIME 4999 5000 bootdelaykey - see CONFIG_AUTOBOOT_DELAY_STR 5001 5002 bootstopkey - see CONFIG_AUTOBOOT_STOP_STR 5003 5004 ethprime - controls which interface is used first. 5005 5006 ethact - controls which interface is currently active. 5007 For example you can do the following 5008 5009 => setenv ethact FEC 5010 => ping 192.168.0.1 # traffic sent on FEC 5011 => setenv ethact SCC 5012 => ping 10.0.0.1 # traffic sent on SCC 5013 5014 ethrotate - When set to "no" U-Boot does not go through all 5015 available network interfaces. 5016 It just stays at the currently selected interface. 5017 5018 netretry - When set to "no" each network operation will 5019 either succeed or fail without retrying. 5020 When set to "once" the network operation will 5021 fail when all the available network interfaces 5022 are tried once without success. 5023 Useful on scripts which control the retry operation 5024 themselves. 5025 5026 npe_ucode - set load address for the NPE microcode 5027 5028 silent_linux - If set then Linux will be told to boot silently, by 5029 changing the console to be empty. If "yes" it will be 5030 made silent. If "no" it will not be made silent. If 5031 unset, then it will be made silent if the U-Boot console 5032 is silent. 5033 5034 tftpsrcp - If this is set, the value is used for TFTP's 5035 UDP source port. 5036 5037 tftpdstp - If this is set, the value is used for TFTP's UDP 5038 destination port instead of the Well Know Port 69. 5039 5040 tftpblocksize - Block size to use for TFTP transfers; if not set, 5041 we use the TFTP server's default block size 5042 5043 tftptimeout - Retransmission timeout for TFTP packets (in milli- 5044 seconds, minimum value is 1000 = 1 second). Defines 5045 when a packet is considered to be lost so it has to 5046 be retransmitted. The default is 5000 = 5 seconds. 5047 Lowering this value may make downloads succeed 5048 faster in networks with high packet loss rates or 5049 with unreliable TFTP servers. 5050 5051 tftptimeoutcountmax - maximum count of TFTP timeouts (no 5052 unit, minimum value = 0). Defines how many timeouts 5053 can happen during a single file transfer before that 5054 transfer is aborted. The default is 10, and 0 means 5055 'no timeouts allowed'. Increasing this value may help 5056 downloads succeed with high packet loss rates, or with 5057 unreliable TFTP servers or client hardware. 5058 5059 vlan - When set to a value < 4095 the traffic over 5060 Ethernet is encapsulated/received over 802.1q 5061 VLAN tagged frames. 5062 5063 bootpretryperiod - Period during which BOOTP/DHCP sends retries. 5064 Unsigned value, in milliseconds. If not set, the period will 5065 be either the default (28000), or a value based on 5066 CONFIG_NET_RETRY_COUNT, if defined. This value has 5067 precedence over the valu based on CONFIG_NET_RETRY_COUNT. 5068 5069The following image location variables contain the location of images 5070used in booting. The "Image" column gives the role of the image and is 5071not an environment variable name. The other columns are environment 5072variable names. "File Name" gives the name of the file on a TFTP 5073server, "RAM Address" gives the location in RAM the image will be 5074loaded to, and "Flash Location" gives the image's address in NOR 5075flash or offset in NAND flash. 5076 5077*Note* - these variables don't have to be defined for all boards, some 5078boards currently use other variables for these purposes, and some 5079boards use these variables for other purposes. 5080 5081Image File Name RAM Address Flash Location 5082----- --------- ----------- -------------- 5083u-boot u-boot u-boot_addr_r u-boot_addr 5084Linux kernel bootfile kernel_addr_r kernel_addr 5085device tree blob fdtfile fdt_addr_r fdt_addr 5086ramdisk ramdiskfile ramdisk_addr_r ramdisk_addr 5087 5088The following environment variables may be used and automatically 5089updated by the network boot commands ("bootp" and "rarpboot"), 5090depending the information provided by your boot server: 5091 5092 bootfile - see above 5093 dnsip - IP address of your Domain Name Server 5094 dnsip2 - IP address of your secondary Domain Name Server 5095 gatewayip - IP address of the Gateway (Router) to use 5096 hostname - Target hostname 5097 ipaddr - see above 5098 netmask - Subnet Mask 5099 rootpath - Pathname of the root filesystem on the NFS server 5100 serverip - see above 5101 5102 5103There are two special Environment Variables: 5104 5105 serial# - contains hardware identification information such 5106 as type string and/or serial number 5107 ethaddr - Ethernet address 5108 5109These variables can be set only once (usually during manufacturing of 5110the board). U-Boot refuses to delete or overwrite these variables 5111once they have been set once. 5112 5113 5114Further special Environment Variables: 5115 5116 ver - Contains the U-Boot version string as printed 5117 with the "version" command. This variable is 5118 readonly (see CONFIG_VERSION_VARIABLE). 5119 5120 5121Please note that changes to some configuration parameters may take 5122only effect after the next boot (yes, that's just like Windoze :-). 5123 5124 5125Callback functions for environment variables: 5126--------------------------------------------- 5127 5128For some environment variables, the behavior of u-boot needs to change 5129when their values are changed. This functionality allows functions to 5130be associated with arbitrary variables. On creation, overwrite, or 5131deletion, the callback will provide the opportunity for some side 5132effect to happen or for the change to be rejected. 5133 5134The callbacks are named and associated with a function using the 5135U_BOOT_ENV_CALLBACK macro in your board or driver code. 5136 5137These callbacks are associated with variables in one of two ways. The 5138static list can be added to by defining CONFIG_ENV_CALLBACK_LIST_STATIC 5139in the board configuration to a string that defines a list of 5140associations. The list must be in the following format: 5141 5142 entry = variable_name[:callback_name] 5143 list = entry[,list] 5144 5145If the callback name is not specified, then the callback is deleted. 5146Spaces are also allowed anywhere in the list. 5147 5148Callbacks can also be associated by defining the ".callbacks" variable 5149with the same list format above. Any association in ".callbacks" will 5150override any association in the static list. You can define 5151CONFIG_ENV_CALLBACK_LIST_DEFAULT to a list (string) to define the 5152".callbacks" environment variable in the default or embedded environment. 5153 5154If CONFIG_REGEX is defined, the variable_name above is evaluated as a 5155regular expression. This allows multiple variables to be connected to 5156the same callback without explicitly listing them all out. 5157 5158 5159Command Line Parsing: 5160===================== 5161 5162There are two different command line parsers available with U-Boot: 5163the old "simple" one, and the much more powerful "hush" shell: 5164 5165Old, simple command line parser: 5166-------------------------------- 5167 5168- supports environment variables (through setenv / saveenv commands) 5169- several commands on one line, separated by ';' 5170- variable substitution using "... ${name} ..." syntax 5171- special characters ('$', ';') can be escaped by prefixing with '\', 5172 for example: 5173 setenv bootcmd bootm \${address} 5174- You can also escape text by enclosing in single apostrophes, for example: 5175 setenv addip 'setenv bootargs $bootargs ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname::off' 5176 5177Hush shell: 5178----------- 5179 5180- similar to Bourne shell, with control structures like 5181 if...then...else...fi, for...do...done; while...do...done, 5182 until...do...done, ... 5183- supports environment ("global") variables (through setenv / saveenv 5184 commands) and local shell variables (through standard shell syntax 5185 "name=value"); only environment variables can be used with "run" 5186 command 5187 5188General rules: 5189-------------- 5190 5191(1) If a command line (or an environment variable executed by a "run" 5192 command) contains several commands separated by semicolon, and 5193 one of these commands fails, then the remaining commands will be 5194 executed anyway. 5195 5196(2) If you execute several variables with one call to run (i. e. 5197 calling run with a list of variables as arguments), any failing 5198 command will cause "run" to terminate, i. e. the remaining 5199 variables are not executed. 5200 5201Note for Redundant Ethernet Interfaces: 5202======================================= 5203 5204Some boards come with redundant Ethernet interfaces; U-Boot supports 5205such configurations and is capable of automatic selection of a 5206"working" interface when needed. MAC assignment works as follows: 5207 5208Network interfaces are numbered eth0, eth1, eth2, ... Corresponding 5209MAC addresses can be stored in the environment as "ethaddr" (=>eth0), 5210"eth1addr" (=>eth1), "eth2addr", ... 5211 5212If the network interface stores some valid MAC address (for instance 5213in SROM), this is used as default address if there is NO correspon- 5214ding setting in the environment; if the corresponding environment 5215variable is set, this overrides the settings in the card; that means: 5216 5217o If the SROM has a valid MAC address, and there is no address in the 5218 environment, the SROM's address is used. 5219 5220o If there is no valid address in the SROM, and a definition in the 5221 environment exists, then the value from the environment variable is 5222 used. 5223 5224o If both the SROM and the environment contain a MAC address, and 5225 both addresses are the same, this MAC address is used. 5226 5227o If both the SROM and the environment contain a MAC address, and the 5228 addresses differ, the value from the environment is used and a 5229 warning is printed. 5230 5231o If neither SROM nor the environment contain a MAC address, an error 5232 is raised. If CONFIG_NET_RANDOM_ETHADDR is defined, then in this case 5233 a random, locally-assigned MAC is used. 5234 5235If Ethernet drivers implement the 'write_hwaddr' function, valid MAC addresses 5236will be programmed into hardware as part of the initialization process. This 5237may be skipped by setting the appropriate 'ethmacskip' environment variable. 5238The naming convention is as follows: 5239"ethmacskip" (=>eth0), "eth1macskip" (=>eth1) etc. 5240 5241Image Formats: 5242============== 5243 5244U-Boot is capable of booting (and performing other auxiliary operations on) 5245images in two formats: 5246 5247New uImage format (FIT) 5248----------------------- 5249 5250Flexible and powerful format based on Flattened Image Tree -- FIT (similar 5251to Flattened Device Tree). It allows the use of images with multiple 5252components (several kernels, ramdisks, etc.), with contents protected by 5253SHA1, MD5 or CRC32. More details are found in the doc/uImage.FIT directory. 5254 5255 5256Old uImage format 5257----------------- 5258 5259Old image format is based on binary files which can be basically anything, 5260preceded by a special header; see the definitions in include/image.h for 5261details; basically, the header defines the following image properties: 5262 5263* Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD, 5264 4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks, 5265 LynxOS, pSOS, QNX, RTEMS, INTEGRITY; 5266 Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, LynxOS, 5267 INTEGRITY). 5268* Target CPU Architecture (Provisions for Alpha, ARM, AVR32, Intel x86, 5269 IA64, MIPS, NDS32, Nios II, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit; 5270 Currently supported: ARM, AVR32, Intel x86, MIPS, NDS32, Nios II, PowerPC). 5271* Compression Type (uncompressed, gzip, bzip2) 5272* Load Address 5273* Entry Point 5274* Image Name 5275* Image Timestamp 5276 5277The header is marked by a special Magic Number, and both the header 5278and the data portions of the image are secured against corruption by 5279CRC32 checksums. 5280 5281 5282Linux Support: 5283============== 5284 5285Although U-Boot should support any OS or standalone application 5286easily, the main focus has always been on Linux during the design of 5287U-Boot. 5288 5289U-Boot includes many features that so far have been part of some 5290special "boot loader" code within the Linux kernel. Also, any 5291"initrd" images to be used are no longer part of one big Linux image; 5292instead, kernel and "initrd" are separate images. This implementation 5293serves several purposes: 5294 5295- the same features can be used for other OS or standalone 5296 applications (for instance: using compressed images to reduce the 5297 Flash memory footprint) 5298 5299- it becomes much easier to port new Linux kernel versions because 5300 lots of low-level, hardware dependent stuff are done by U-Boot 5301 5302- the same Linux kernel image can now be used with different "initrd" 5303 images; of course this also means that different kernel images can 5304 be run with the same "initrd". This makes testing easier (you don't 5305 have to build a new "zImage.initrd" Linux image when you just 5306 change a file in your "initrd"). Also, a field-upgrade of the 5307 software is easier now. 5308 5309 5310Linux HOWTO: 5311============ 5312 5313Porting Linux to U-Boot based systems: 5314--------------------------------------- 5315 5316U-Boot cannot save you from doing all the necessary modifications to 5317configure the Linux device drivers for use with your target hardware 5318(no, we don't intend to provide a full virtual machine interface to 5319Linux :-). 5320 5321But now you can ignore ALL boot loader code (in arch/powerpc/mbxboot). 5322 5323Just make sure your machine specific header file (for instance 5324include/asm-ppc/tqm8xx.h) includes the same definition of the Board 5325Information structure as we define in include/asm-<arch>/u-boot.h, 5326and make sure that your definition of IMAP_ADDR uses the same value 5327as your U-Boot configuration in CONFIG_SYS_IMMR. 5328 5329Note that U-Boot now has a driver model, a unified model for drivers. 5330If you are adding a new driver, plumb it into driver model. If there 5331is no uclass available, you are encouraged to create one. See 5332doc/driver-model. 5333 5334 5335Configuring the Linux kernel: 5336----------------------------- 5337 5338No specific requirements for U-Boot. Make sure you have some root 5339device (initial ramdisk, NFS) for your target system. 5340 5341 5342Building a Linux Image: 5343----------------------- 5344 5345With U-Boot, "normal" build targets like "zImage" or "bzImage" are 5346not used. If you use recent kernel source, a new build target 5347"uImage" will exist which automatically builds an image usable by 5348U-Boot. Most older kernels also have support for a "pImage" target, 5349which was introduced for our predecessor project PPCBoot and uses a 5350100% compatible format. 5351 5352Example: 5353 5354 make TQM850L_defconfig 5355 make oldconfig 5356 make dep 5357 make uImage 5358 5359The "uImage" build target uses a special tool (in 'tools/mkimage') to 5360encapsulate a compressed Linux kernel image with header information, 5361CRC32 checksum etc. for use with U-Boot. This is what we are doing: 5362 5363* build a standard "vmlinux" kernel image (in ELF binary format): 5364 5365* convert the kernel into a raw binary image: 5366 5367 ${CROSS_COMPILE}-objcopy -O binary \ 5368 -R .note -R .comment \ 5369 -S vmlinux linux.bin 5370 5371* compress the binary image: 5372 5373 gzip -9 linux.bin 5374 5375* package compressed binary image for U-Boot: 5376 5377 mkimage -A ppc -O linux -T kernel -C gzip \ 5378 -a 0 -e 0 -n "Linux Kernel Image" \ 5379 -d linux.bin.gz uImage 5380 5381 5382The "mkimage" tool can also be used to create ramdisk images for use 5383with U-Boot, either separated from the Linux kernel image, or 5384combined into one file. "mkimage" encapsulates the images with a 64 5385byte header containing information about target architecture, 5386operating system, image type, compression method, entry points, time 5387stamp, CRC32 checksums, etc. 5388 5389"mkimage" can be called in two ways: to verify existing images and 5390print the header information, or to build new images. 5391 5392In the first form (with "-l" option) mkimage lists the information 5393contained in the header of an existing U-Boot image; this includes 5394checksum verification: 5395 5396 tools/mkimage -l image 5397 -l ==> list image header information 5398 5399The second form (with "-d" option) is used to build a U-Boot image 5400from a "data file" which is used as image payload: 5401 5402 tools/mkimage -A arch -O os -T type -C comp -a addr -e ep \ 5403 -n name -d data_file image 5404 -A ==> set architecture to 'arch' 5405 -O ==> set operating system to 'os' 5406 -T ==> set image type to 'type' 5407 -C ==> set compression type 'comp' 5408 -a ==> set load address to 'addr' (hex) 5409 -e ==> set entry point to 'ep' (hex) 5410 -n ==> set image name to 'name' 5411 -d ==> use image data from 'datafile' 5412 5413Right now, all Linux kernels for PowerPC systems use the same load 5414address (0x00000000), but the entry point address depends on the 5415kernel version: 5416 5417- 2.2.x kernels have the entry point at 0x0000000C, 5418- 2.3.x and later kernels have the entry point at 0x00000000. 5419 5420So a typical call to build a U-Boot image would read: 5421 5422 -> tools/mkimage -n '2.4.4 kernel for TQM850L' \ 5423 > -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \ 5424 > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz \ 5425 > examples/uImage.TQM850L 5426 Image Name: 2.4.4 kernel for TQM850L 5427 Created: Wed Jul 19 02:34:59 2000 5428 Image Type: PowerPC Linux Kernel Image (gzip compressed) 5429 Data Size: 335725 Bytes = 327.86 kB = 0.32 MB 5430 Load Address: 0x00000000 5431 Entry Point: 0x00000000 5432 5433To verify the contents of the image (or check for corruption): 5434 5435 -> tools/mkimage -l examples/uImage.TQM850L 5436 Image Name: 2.4.4 kernel for TQM850L 5437 Created: Wed Jul 19 02:34:59 2000 5438 Image Type: PowerPC Linux Kernel Image (gzip compressed) 5439 Data Size: 335725 Bytes = 327.86 kB = 0.32 MB 5440 Load Address: 0x00000000 5441 Entry Point: 0x00000000 5442 5443NOTE: for embedded systems where boot time is critical you can trade 5444speed for memory and install an UNCOMPRESSED image instead: this 5445needs more space in Flash, but boots much faster since it does not 5446need to be uncompressed: 5447 5448 -> gunzip /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz 5449 -> tools/mkimage -n '2.4.4 kernel for TQM850L' \ 5450 > -A ppc -O linux -T kernel -C none -a 0 -e 0 \ 5451 > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux \ 5452 > examples/uImage.TQM850L-uncompressed 5453 Image Name: 2.4.4 kernel for TQM850L 5454 Created: Wed Jul 19 02:34:59 2000 5455 Image Type: PowerPC Linux Kernel Image (uncompressed) 5456 Data Size: 792160 Bytes = 773.59 kB = 0.76 MB 5457 Load Address: 0x00000000 5458 Entry Point: 0x00000000 5459 5460 5461Similar you can build U-Boot images from a 'ramdisk.image.gz' file 5462when your kernel is intended to use an initial ramdisk: 5463 5464 -> tools/mkimage -n 'Simple Ramdisk Image' \ 5465 > -A ppc -O linux -T ramdisk -C gzip \ 5466 > -d /LinuxPPC/images/SIMPLE-ramdisk.image.gz examples/simple-initrd 5467 Image Name: Simple Ramdisk Image 5468 Created: Wed Jan 12 14:01:50 2000 5469 Image Type: PowerPC Linux RAMDisk Image (gzip compressed) 5470 Data Size: 566530 Bytes = 553.25 kB = 0.54 MB 5471 Load Address: 0x00000000 5472 Entry Point: 0x00000000 5473 5474The "dumpimage" is a tool to disassemble images built by mkimage. Its "-i" 5475option performs the converse operation of the mkimage's second form (the "-d" 5476option). Given an image built by mkimage, the dumpimage extracts a "data file" 5477from the image: 5478 5479 tools/dumpimage -i image -T type -p position data_file 5480 -i ==> extract from the 'image' a specific 'data_file' 5481 -T ==> set image type to 'type' 5482 -p ==> 'position' (starting at 0) of the 'data_file' inside the 'image' 5483 5484 5485Installing a Linux Image: 5486------------------------- 5487 5488To downloading a U-Boot image over the serial (console) interface, 5489you must convert the image to S-Record format: 5490 5491 objcopy -I binary -O srec examples/image examples/image.srec 5492 5493The 'objcopy' does not understand the information in the U-Boot 5494image header, so the resulting S-Record file will be relative to 5495address 0x00000000. To load it to a given address, you need to 5496specify the target address as 'offset' parameter with the 'loads' 5497command. 5498 5499Example: install the image to address 0x40100000 (which on the 5500TQM8xxL is in the first Flash bank): 5501 5502 => erase 40100000 401FFFFF 5503 5504 .......... done 5505 Erased 8 sectors 5506 5507 => loads 40100000 5508 ## Ready for S-Record download ... 5509 ~>examples/image.srec 5510 1 2 3 4 5 6 7 8 9 10 11 12 13 ... 5511 ... 5512 15989 15990 15991 15992 5513 [file transfer complete] 5514 [connected] 5515 ## Start Addr = 0x00000000 5516 5517 5518You can check the success of the download using the 'iminfo' command; 5519this includes a checksum verification so you can be sure no data 5520corruption happened: 5521 5522 => imi 40100000 5523 5524 ## Checking Image at 40100000 ... 5525 Image Name: 2.2.13 for initrd on TQM850L 5526 Image Type: PowerPC Linux Kernel Image (gzip compressed) 5527 Data Size: 335725 Bytes = 327 kB = 0 MB 5528 Load Address: 00000000 5529 Entry Point: 0000000c 5530 Verifying Checksum ... OK 5531 5532 5533Boot Linux: 5534----------- 5535 5536The "bootm" command is used to boot an application that is stored in 5537memory (RAM or Flash). In case of a Linux kernel image, the contents 5538of the "bootargs" environment variable is passed to the kernel as 5539parameters. You can check and modify this variable using the 5540"printenv" and "setenv" commands: 5541 5542 5543 => printenv bootargs 5544 bootargs=root=/dev/ram 5545 5546 => setenv bootargs root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2 5547 5548 => printenv bootargs 5549 bootargs=root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2 5550 5551 => bootm 40020000 5552 ## Booting Linux kernel at 40020000 ... 5553 Image Name: 2.2.13 for NFS on TQM850L 5554 Image Type: PowerPC Linux Kernel Image (gzip compressed) 5555 Data Size: 381681 Bytes = 372 kB = 0 MB 5556 Load Address: 00000000 5557 Entry Point: 0000000c 5558 Verifying Checksum ... OK 5559 Uncompressing Kernel Image ... OK 5560 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 5561 Boot arguments: root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2 5562 time_init: decrementer frequency = 187500000/60 5563 Calibrating delay loop... 49.77 BogoMIPS 5564 Memory: 15208k available (700k kernel code, 444k data, 32k init) [c0000000,c1000000] 5565 ... 5566 5567If you want to boot a Linux kernel with initial RAM disk, you pass 5568the memory addresses of both the kernel and the initrd image (PPBCOOT 5569format!) to the "bootm" command: 5570 5571 => imi 40100000 40200000 5572 5573 ## Checking Image at 40100000 ... 5574 Image Name: 2.2.13 for initrd on TQM850L 5575 Image Type: PowerPC Linux Kernel Image (gzip compressed) 5576 Data Size: 335725 Bytes = 327 kB = 0 MB 5577 Load Address: 00000000 5578 Entry Point: 0000000c 5579 Verifying Checksum ... OK 5580 5581 ## Checking Image at 40200000 ... 5582 Image Name: Simple Ramdisk Image 5583 Image Type: PowerPC Linux RAMDisk Image (gzip compressed) 5584 Data Size: 566530 Bytes = 553 kB = 0 MB 5585 Load Address: 00000000 5586 Entry Point: 00000000 5587 Verifying Checksum ... OK 5588 5589 => bootm 40100000 40200000 5590 ## Booting Linux kernel at 40100000 ... 5591 Image Name: 2.2.13 for initrd on TQM850L 5592 Image Type: PowerPC Linux Kernel Image (gzip compressed) 5593 Data Size: 335725 Bytes = 327 kB = 0 MB 5594 Load Address: 00000000 5595 Entry Point: 0000000c 5596 Verifying Checksum ... OK 5597 Uncompressing Kernel Image ... OK 5598 ## Loading RAMDisk Image at 40200000 ... 5599 Image Name: Simple Ramdisk Image 5600 Image Type: PowerPC Linux RAMDisk Image (gzip compressed) 5601 Data Size: 566530 Bytes = 553 kB = 0 MB 5602 Load Address: 00000000 5603 Entry Point: 00000000 5604 Verifying Checksum ... OK 5605 Loading Ramdisk ... OK 5606 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 5607 Boot arguments: root=/dev/ram 5608 time_init: decrementer frequency = 187500000/60 5609 Calibrating delay loop... 49.77 BogoMIPS 5610 ... 5611 RAMDISK: Compressed image found at block 0 5612 VFS: Mounted root (ext2 filesystem). 5613 5614 bash# 5615 5616Boot Linux and pass a flat device tree: 5617----------- 5618 5619First, U-Boot must be compiled with the appropriate defines. See the section 5620titled "Linux Kernel Interface" above for a more in depth explanation. The 5621following is an example of how to start a kernel and pass an updated 5622flat device tree: 5623 5624=> print oftaddr 5625oftaddr=0x300000 5626=> print oft 5627oft=oftrees/mpc8540ads.dtb 5628=> tftp $oftaddr $oft 5629Speed: 1000, full duplex 5630Using TSEC0 device 5631TFTP from server 192.168.1.1; our IP address is 192.168.1.101 5632Filename 'oftrees/mpc8540ads.dtb'. 5633Load address: 0x300000 5634Loading: # 5635done 5636Bytes transferred = 4106 (100a hex) 5637=> tftp $loadaddr $bootfile 5638Speed: 1000, full duplex 5639Using TSEC0 device 5640TFTP from server 192.168.1.1; our IP address is 192.168.1.2 5641Filename 'uImage'. 5642Load address: 0x200000 5643Loading:############ 5644done 5645Bytes transferred = 1029407 (fb51f hex) 5646=> print loadaddr 5647loadaddr=200000 5648=> print oftaddr 5649oftaddr=0x300000 5650=> bootm $loadaddr - $oftaddr 5651## Booting image at 00200000 ... 5652 Image Name: Linux-2.6.17-dirty 5653 Image Type: PowerPC Linux Kernel Image (gzip compressed) 5654 Data Size: 1029343 Bytes = 1005.2 kB 5655 Load Address: 00000000 5656 Entry Point: 00000000 5657 Verifying Checksum ... OK 5658 Uncompressing Kernel Image ... OK 5659Booting using flat device tree at 0x300000 5660Using MPC85xx ADS machine description 5661Memory CAM mapping: CAM0=256Mb, CAM1=256Mb, CAM2=0Mb residual: 0Mb 5662[snip] 5663 5664 5665More About U-Boot Image Types: 5666------------------------------ 5667 5668U-Boot supports the following image types: 5669 5670 "Standalone Programs" are directly runnable in the environment 5671 provided by U-Boot; it is expected that (if they behave 5672 well) you can continue to work in U-Boot after return from 5673 the Standalone Program. 5674 "OS Kernel Images" are usually images of some Embedded OS which 5675 will take over control completely. Usually these programs 5676 will install their own set of exception handlers, device 5677 drivers, set up the MMU, etc. - this means, that you cannot 5678 expect to re-enter U-Boot except by resetting the CPU. 5679 "RAMDisk Images" are more or less just data blocks, and their 5680 parameters (address, size) are passed to an OS kernel that is 5681 being started. 5682 "Multi-File Images" contain several images, typically an OS 5683 (Linux) kernel image and one or more data images like 5684 RAMDisks. This construct is useful for instance when you want 5685 to boot over the network using BOOTP etc., where the boot 5686 server provides just a single image file, but you want to get 5687 for instance an OS kernel and a RAMDisk image. 5688 5689 "Multi-File Images" start with a list of image sizes, each 5690 image size (in bytes) specified by an "uint32_t" in network 5691 byte order. This list is terminated by an "(uint32_t)0". 5692 Immediately after the terminating 0 follow the images, one by 5693 one, all aligned on "uint32_t" boundaries (size rounded up to 5694 a multiple of 4 bytes). 5695 5696 "Firmware Images" are binary images containing firmware (like 5697 U-Boot or FPGA images) which usually will be programmed to 5698 flash memory. 5699 5700 "Script files" are command sequences that will be executed by 5701 U-Boot's command interpreter; this feature is especially 5702 useful when you configure U-Boot to use a real shell (hush) 5703 as command interpreter. 5704 5705Booting the Linux zImage: 5706------------------------- 5707 5708On some platforms, it's possible to boot Linux zImage. This is done 5709using the "bootz" command. The syntax of "bootz" command is the same 5710as the syntax of "bootm" command. 5711 5712Note, defining the CONFIG_SUPPORT_RAW_INITRD allows user to supply 5713kernel with raw initrd images. The syntax is slightly different, the 5714address of the initrd must be augmented by it's size, in the following 5715format: "<initrd addres>:<initrd size>". 5716 5717 5718Standalone HOWTO: 5719================= 5720 5721One of the features of U-Boot is that you can dynamically load and 5722run "standalone" applications, which can use some resources of 5723U-Boot like console I/O functions or interrupt services. 5724 5725Two simple examples are included with the sources: 5726 5727"Hello World" Demo: 5728------------------- 5729 5730'examples/hello_world.c' contains a small "Hello World" Demo 5731application; it is automatically compiled when you build U-Boot. 5732It's configured to run at address 0x00040004, so you can play with it 5733like that: 5734 5735 => loads 5736 ## Ready for S-Record download ... 5737 ~>examples/hello_world.srec 5738 1 2 3 4 5 6 7 8 9 10 11 ... 5739 [file transfer complete] 5740 [connected] 5741 ## Start Addr = 0x00040004 5742 5743 => go 40004 Hello World! This is a test. 5744 ## Starting application at 0x00040004 ... 5745 Hello World 5746 argc = 7 5747 argv[0] = "40004" 5748 argv[1] = "Hello" 5749 argv[2] = "World!" 5750 argv[3] = "This" 5751 argv[4] = "is" 5752 argv[5] = "a" 5753 argv[6] = "test." 5754 argv[7] = "<NULL>" 5755 Hit any key to exit ... 5756 5757 ## Application terminated, rc = 0x0 5758 5759Another example, which demonstrates how to register a CPM interrupt 5760handler with the U-Boot code, can be found in 'examples/timer.c'. 5761Here, a CPM timer is set up to generate an interrupt every second. 5762The interrupt service routine is trivial, just printing a '.' 5763character, but this is just a demo program. The application can be 5764controlled by the following keys: 5765 5766 ? - print current values og the CPM Timer registers 5767 b - enable interrupts and start timer 5768 e - stop timer and disable interrupts 5769 q - quit application 5770 5771 => loads 5772 ## Ready for S-Record download ... 5773 ~>examples/timer.srec 5774 1 2 3 4 5 6 7 8 9 10 11 ... 5775 [file transfer complete] 5776 [connected] 5777 ## Start Addr = 0x00040004 5778 5779 => go 40004 5780 ## Starting application at 0x00040004 ... 5781 TIMERS=0xfff00980 5782 Using timer 1 5783 tgcr @ 0xfff00980, tmr @ 0xfff00990, trr @ 0xfff00994, tcr @ 0xfff00998, tcn @ 0xfff0099c, ter @ 0xfff009b0 5784 5785Hit 'b': 5786 [q, b, e, ?] Set interval 1000000 us 5787 Enabling timer 5788Hit '?': 5789 [q, b, e, ?] ........ 5790 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0xef6, ter=0x0 5791Hit '?': 5792 [q, b, e, ?] . 5793 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x2ad4, ter=0x0 5794Hit '?': 5795 [q, b, e, ?] . 5796 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x1efc, ter=0x0 5797Hit '?': 5798 [q, b, e, ?] . 5799 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x169d, ter=0x0 5800Hit 'e': 5801 [q, b, e, ?] ...Stopping timer 5802Hit 'q': 5803 [q, b, e, ?] ## Application terminated, rc = 0x0 5804 5805 5806Minicom warning: 5807================ 5808 5809Over time, many people have reported problems when trying to use the 5810"minicom" terminal emulation program for serial download. I (wd) 5811consider minicom to be broken, and recommend not to use it. Under 5812Unix, I recommend to use C-Kermit for general purpose use (and 5813especially for kermit binary protocol download ("loadb" command), and 5814use "cu" for S-Record download ("loads" command). See 5815http://www.denx.de/wiki/view/DULG/SystemSetup#Section_4.3. 5816for help with kermit. 5817 5818 5819Nevertheless, if you absolutely want to use it try adding this 5820configuration to your "File transfer protocols" section: 5821 5822 Name Program Name U/D FullScr IO-Red. Multi 5823 X kermit /usr/bin/kermit -i -l %l -s Y U Y N N 5824 Y kermit /usr/bin/kermit -i -l %l -r N D Y N N 5825 5826 5827NetBSD Notes: 5828============= 5829 5830Starting at version 0.9.2, U-Boot supports NetBSD both as host 5831(build U-Boot) and target system (boots NetBSD/mpc8xx). 5832 5833Building requires a cross environment; it is known to work on 5834NetBSD/i386 with the cross-powerpc-netbsd-1.3 package (you will also 5835need gmake since the Makefiles are not compatible with BSD make). 5836Note that the cross-powerpc package does not install include files; 5837attempting to build U-Boot will fail because <machine/ansi.h> is 5838missing. This file has to be installed and patched manually: 5839 5840 # cd /usr/pkg/cross/powerpc-netbsd/include 5841 # mkdir powerpc 5842 # ln -s powerpc machine 5843 # cp /usr/src/sys/arch/powerpc/include/ansi.h powerpc/ansi.h 5844 # ${EDIT} powerpc/ansi.h ## must remove __va_list, _BSD_VA_LIST 5845 5846Native builds *don't* work due to incompatibilities between native 5847and U-Boot include files. 5848 5849Booting assumes that (the first part of) the image booted is a 5850stage-2 loader which in turn loads and then invokes the kernel 5851proper. Loader sources will eventually appear in the NetBSD source 5852tree (probably in sys/arc/mpc8xx/stand/u-boot_stage2/); in the 5853meantime, see ftp://ftp.denx.de/pub/u-boot/ppcboot_stage2.tar.gz 5854 5855 5856Implementation Internals: 5857========================= 5858 5859The following is not intended to be a complete description of every 5860implementation detail. However, it should help to understand the 5861inner workings of U-Boot and make it easier to port it to custom 5862hardware. 5863 5864 5865Initial Stack, Global Data: 5866--------------------------- 5867 5868The implementation of U-Boot is complicated by the fact that U-Boot 5869starts running out of ROM (flash memory), usually without access to 5870system RAM (because the memory controller is not initialized yet). 5871This means that we don't have writable Data or BSS segments, and BSS 5872is not initialized as zero. To be able to get a C environment working 5873at all, we have to allocate at least a minimal stack. Implementation 5874options for this are defined and restricted by the CPU used: Some CPU 5875models provide on-chip memory (like the IMMR area on MPC8xx and 5876MPC826x processors), on others (parts of) the data cache can be 5877locked as (mis-) used as memory, etc. 5878 5879 Chris Hallinan posted a good summary of these issues to the 5880 U-Boot mailing list: 5881 5882 Subject: RE: [U-Boot-Users] RE: More On Memory Bank x (nothingness)? 5883 From: "Chris Hallinan" <clh@net1plus.com> 5884 Date: Mon, 10 Feb 2003 16:43:46 -0500 (22:43 MET) 5885 ... 5886 5887 Correct me if I'm wrong, folks, but the way I understand it 5888 is this: Using DCACHE as initial RAM for Stack, etc, does not 5889 require any physical RAM backing up the cache. The cleverness 5890 is that the cache is being used as a temporary supply of 5891 necessary storage before the SDRAM controller is setup. It's 5892 beyond the scope of this list to explain the details, but you 5893 can see how this works by studying the cache architecture and 5894 operation in the architecture and processor-specific manuals. 5895 5896 OCM is On Chip Memory, which I believe the 405GP has 4K. It 5897 is another option for the system designer to use as an 5898 initial stack/RAM area prior to SDRAM being available. Either 5899 option should work for you. Using CS 4 should be fine if your 5900 board designers haven't used it for something that would 5901 cause you grief during the initial boot! It is frequently not 5902 used. 5903 5904 CONFIG_SYS_INIT_RAM_ADDR should be somewhere that won't interfere 5905 with your processor/board/system design. The default value 5906 you will find in any recent u-boot distribution in 5907 walnut.h should work for you. I'd set it to a value larger 5908 than your SDRAM module. If you have a 64MB SDRAM module, set 5909 it above 400_0000. Just make sure your board has no resources 5910 that are supposed to respond to that address! That code in 5911 start.S has been around a while and should work as is when 5912 you get the config right. 5913 5914 -Chris Hallinan 5915 DS4.COM, Inc. 5916 5917It is essential to remember this, since it has some impact on the C 5918code for the initialization procedures: 5919 5920* Initialized global data (data segment) is read-only. Do not attempt 5921 to write it. 5922 5923* Do not use any uninitialized global data (or implicitly initialized 5924 as zero data - BSS segment) at all - this is undefined, initiali- 5925 zation is performed later (when relocating to RAM). 5926 5927* Stack space is very limited. Avoid big data buffers or things like 5928 that. 5929 5930Having only the stack as writable memory limits means we cannot use 5931normal global data to share information between the code. But it 5932turned out that the implementation of U-Boot can be greatly 5933simplified by making a global data structure (gd_t) available to all 5934functions. We could pass a pointer to this data as argument to _all_ 5935functions, but this would bloat the code. Instead we use a feature of 5936the GCC compiler (Global Register Variables) to share the data: we 5937place a pointer (gd) to the global data into a register which we 5938reserve for this purpose. 5939 5940When choosing a register for such a purpose we are restricted by the 5941relevant (E)ABI specifications for the current architecture, and by 5942GCC's implementation. 5943 5944For PowerPC, the following registers have specific use: 5945 R1: stack pointer 5946 R2: reserved for system use 5947 R3-R4: parameter passing and return values 5948 R5-R10: parameter passing 5949 R13: small data area pointer 5950 R30: GOT pointer 5951 R31: frame pointer 5952 5953 (U-Boot also uses R12 as internal GOT pointer. r12 5954 is a volatile register so r12 needs to be reset when 5955 going back and forth between asm and C) 5956 5957 ==> U-Boot will use R2 to hold a pointer to the global data 5958 5959 Note: on PPC, we could use a static initializer (since the 5960 address of the global data structure is known at compile time), 5961 but it turned out that reserving a register results in somewhat 5962 smaller code - although the code savings are not that big (on 5963 average for all boards 752 bytes for the whole U-Boot image, 5964 624 text + 127 data). 5965 5966On Blackfin, the normal C ABI (except for P3) is followed as documented here: 5967 http://docs.blackfin.uclinux.org/doku.php?id=application_binary_interface 5968 5969 ==> U-Boot will use P3 to hold a pointer to the global data 5970 5971On ARM, the following registers are used: 5972 5973 R0: function argument word/integer result 5974 R1-R3: function argument word 5975 R9: platform specific 5976 R10: stack limit (used only if stack checking is enabled) 5977 R11: argument (frame) pointer 5978 R12: temporary workspace 5979 R13: stack pointer 5980 R14: link register 5981 R15: program counter 5982 5983 ==> U-Boot will use R9 to hold a pointer to the global data 5984 5985 Note: on ARM, only R_ARM_RELATIVE relocations are supported. 5986 5987On Nios II, the ABI is documented here: 5988 http://www.altera.com/literature/hb/nios2/n2cpu_nii51016.pdf 5989 5990 ==> U-Boot will use gp to hold a pointer to the global data 5991 5992 Note: on Nios II, we give "-G0" option to gcc and don't use gp 5993 to access small data sections, so gp is free. 5994 5995On NDS32, the following registers are used: 5996 5997 R0-R1: argument/return 5998 R2-R5: argument 5999 R15: temporary register for assembler 6000 R16: trampoline register 6001 R28: frame pointer (FP) 6002 R29: global pointer (GP) 6003 R30: link register (LP) 6004 R31: stack pointer (SP) 6005 PC: program counter (PC) 6006 6007 ==> U-Boot will use R10 to hold a pointer to the global data 6008 6009NOTE: DECLARE_GLOBAL_DATA_PTR must be used with file-global scope, 6010or current versions of GCC may "optimize" the code too much. 6011 6012Memory Management: 6013------------------ 6014 6015U-Boot runs in system state and uses physical addresses, i.e. the 6016MMU is not used either for address mapping nor for memory protection. 6017 6018The available memory is mapped to fixed addresses using the memory 6019controller. In this process, a contiguous block is formed for each 6020memory type (Flash, SDRAM, SRAM), even when it consists of several 6021physical memory banks. 6022 6023U-Boot is installed in the first 128 kB of the first Flash bank (on 6024TQM8xxL modules this is the range 0x40000000 ... 0x4001FFFF). After 6025booting and sizing and initializing DRAM, the code relocates itself 6026to the upper end of DRAM. Immediately below the U-Boot code some 6027memory is reserved for use by malloc() [see CONFIG_SYS_MALLOC_LEN 6028configuration setting]. Below that, a structure with global Board 6029Info data is placed, followed by the stack (growing downward). 6030 6031Additionally, some exception handler code is copied to the low 8 kB 6032of DRAM (0x00000000 ... 0x00001FFF). 6033 6034So a typical memory configuration with 16 MB of DRAM could look like 6035this: 6036 6037 0x0000 0000 Exception Vector code 6038 : 6039 0x0000 1FFF 6040 0x0000 2000 Free for Application Use 6041 : 6042 : 6043 6044 : 6045 : 6046 0x00FB FF20 Monitor Stack (Growing downward) 6047 0x00FB FFAC Board Info Data and permanent copy of global data 6048 0x00FC 0000 Malloc Arena 6049 : 6050 0x00FD FFFF 6051 0x00FE 0000 RAM Copy of Monitor Code 6052 ... eventually: LCD or video framebuffer 6053 ... eventually: pRAM (Protected RAM - unchanged by reset) 6054 0x00FF FFFF [End of RAM] 6055 6056 6057System Initialization: 6058---------------------- 6059 6060In the reset configuration, U-Boot starts at the reset entry point 6061(on most PowerPC systems at address 0x00000100). Because of the reset 6062configuration for CS0# this is a mirror of the on board Flash memory. 6063To be able to re-map memory U-Boot then jumps to its link address. 6064To be able to implement the initialization code in C, a (small!) 6065initial stack is set up in the internal Dual Ported RAM (in case CPUs 6066which provide such a feature like MPC8xx or MPC8260), or in a locked 6067part of the data cache. After that, U-Boot initializes the CPU core, 6068the caches and the SIU. 6069 6070Next, all (potentially) available memory banks are mapped using a 6071preliminary mapping. For example, we put them on 512 MB boundaries 6072(multiples of 0x20000000: SDRAM on 0x00000000 and 0x20000000, Flash 6073on 0x40000000 and 0x60000000, SRAM on 0x80000000). Then UPM A is 6074programmed for SDRAM access. Using the temporary configuration, a 6075simple memory test is run that determines the size of the SDRAM 6076banks. 6077 6078When there is more than one SDRAM bank, and the banks are of 6079different size, the largest is mapped first. For equal size, the first 6080bank (CS2#) is mapped first. The first mapping is always for address 60810x00000000, with any additional banks following immediately to create 6082contiguous memory starting from 0. 6083 6084Then, the monitor installs itself at the upper end of the SDRAM area 6085and allocates memory for use by malloc() and for the global Board 6086Info data; also, the exception vector code is copied to the low RAM 6087pages, and the final stack is set up. 6088 6089Only after this relocation will you have a "normal" C environment; 6090until that you are restricted in several ways, mostly because you are 6091running from ROM, and because the code will have to be relocated to a 6092new address in RAM. 6093 6094 6095U-Boot Porting Guide: 6096---------------------- 6097 6098[Based on messages by Jerry Van Baren in the U-Boot-Users mailing 6099list, October 2002] 6100 6101 6102int main(int argc, char *argv[]) 6103{ 6104 sighandler_t no_more_time; 6105 6106 signal(SIGALRM, no_more_time); 6107 alarm(PROJECT_DEADLINE - toSec (3 * WEEK)); 6108 6109 if (available_money > available_manpower) { 6110 Pay consultant to port U-Boot; 6111 return 0; 6112 } 6113 6114 Download latest U-Boot source; 6115 6116 Subscribe to u-boot mailing list; 6117 6118 if (clueless) 6119 email("Hi, I am new to U-Boot, how do I get started?"); 6120 6121 while (learning) { 6122 Read the README file in the top level directory; 6123 Read http://www.denx.de/twiki/bin/view/DULG/Manual; 6124 Read applicable doc/*.README; 6125 Read the source, Luke; 6126 /* find . -name "*.[chS]" | xargs grep -i <keyword> */ 6127 } 6128 6129 if (available_money > toLocalCurrency ($2500)) 6130 Buy a BDI3000; 6131 else 6132 Add a lot of aggravation and time; 6133 6134 if (a similar board exists) { /* hopefully... */ 6135 cp -a board/<similar> board/<myboard> 6136 cp include/configs/<similar>.h include/configs/<myboard>.h 6137 } else { 6138 Create your own board support subdirectory; 6139 Create your own board include/configs/<myboard>.h file; 6140 } 6141 Edit new board/<myboard> files 6142 Edit new include/configs/<myboard>.h 6143 6144 while (!accepted) { 6145 while (!running) { 6146 do { 6147 Add / modify source code; 6148 } until (compiles); 6149 Debug; 6150 if (clueless) 6151 email("Hi, I am having problems..."); 6152 } 6153 Send patch file to the U-Boot email list; 6154 if (reasonable critiques) 6155 Incorporate improvements from email list code review; 6156 else 6157 Defend code as written; 6158 } 6159 6160 return 0; 6161} 6162 6163void no_more_time (int sig) 6164{ 6165 hire_a_guru(); 6166} 6167 6168 6169Coding Standards: 6170----------------- 6171 6172All contributions to U-Boot should conform to the Linux kernel 6173coding style; see the file "Documentation/CodingStyle" and the script 6174"scripts/Lindent" in your Linux kernel source directory. 6175 6176Source files originating from a different project (for example the 6177MTD subsystem) are generally exempt from these guidelines and are not 6178reformatted to ease subsequent migration to newer versions of those 6179sources. 6180 6181Please note that U-Boot is implemented in C (and to some small parts in 6182Assembler); no C++ is used, so please do not use C++ style comments (//) 6183in your code. 6184 6185Please also stick to the following formatting rules: 6186- remove any trailing white space 6187- use TAB characters for indentation and vertical alignment, not spaces 6188- make sure NOT to use DOS '\r\n' line feeds 6189- do not add more than 2 consecutive empty lines to source files 6190- do not add trailing empty lines to source files 6191 6192Submissions which do not conform to the standards may be returned 6193with a request to reformat the changes. 6194 6195 6196Submitting Patches: 6197------------------- 6198 6199Since the number of patches for U-Boot is growing, we need to 6200establish some rules. Submissions which do not conform to these rules 6201may be rejected, even when they contain important and valuable stuff. 6202 6203Please see http://www.denx.de/wiki/U-Boot/Patches for details. 6204 6205Patches shall be sent to the u-boot mailing list <u-boot@lists.denx.de>; 6206see http://lists.denx.de/mailman/listinfo/u-boot 6207 6208When you send a patch, please include the following information with 6209it: 6210 6211* For bug fixes: a description of the bug and how your patch fixes 6212 this bug. Please try to include a way of demonstrating that the 6213 patch actually fixes something. 6214 6215* For new features: a description of the feature and your 6216 implementation. 6217 6218* A CHANGELOG entry as plaintext (separate from the patch) 6219 6220* For major contributions, add a MAINTAINERS file with your 6221 information and associated file and directory references. 6222 6223* When you add support for a new board, don't forget to add a 6224 maintainer e-mail address to the boards.cfg file, too. 6225 6226* If your patch adds new configuration options, don't forget to 6227 document these in the README file. 6228 6229* The patch itself. If you are using git (which is *strongly* 6230 recommended) you can easily generate the patch using the 6231 "git format-patch". If you then use "git send-email" to send it to 6232 the U-Boot mailing list, you will avoid most of the common problems 6233 with some other mail clients. 6234 6235 If you cannot use git, use "diff -purN OLD NEW". If your version of 6236 diff does not support these options, then get the latest version of 6237 GNU diff. 6238 6239 The current directory when running this command shall be the parent 6240 directory of the U-Boot source tree (i. e. please make sure that 6241 your patch includes sufficient directory information for the 6242 affected files). 6243 6244 We prefer patches as plain text. MIME attachments are discouraged, 6245 and compressed attachments must not be used. 6246 6247* If one logical set of modifications affects or creates several 6248 files, all these changes shall be submitted in a SINGLE patch file. 6249 6250* Changesets that contain different, unrelated modifications shall be 6251 submitted as SEPARATE patches, one patch per changeset. 6252 6253 6254Notes: 6255 6256* Before sending the patch, run the buildman script on your patched 6257 source tree and make sure that no errors or warnings are reported 6258 for any of the boards. 6259 6260* Keep your modifications to the necessary minimum: A patch 6261 containing several unrelated changes or arbitrary reformats will be 6262 returned with a request to re-formatting / split it. 6263 6264* If you modify existing code, make sure that your new code does not 6265 add to the memory footprint of the code ;-) Small is beautiful! 6266 When adding new features, these should compile conditionally only 6267 (using #ifdef), and the resulting code with the new feature 6268 disabled must not need more memory than the old code without your 6269 modification. 6270 6271* Remember that there is a size limit of 100 kB per message on the 6272 u-boot mailing list. Bigger patches will be moderated. If they are 6273 reasonable and not too big, they will be acknowledged. But patches 6274 bigger than the size limit should be avoided. 6275