Kconfig

   1 #
   2 # For a description of the syntax of this configuration file,
   3 # see the file Documentation/kbuild/kconfig-language.txt in the
   4 # Linux kernel source tree.
   5 #
   6 mainmenu "U-Boot $UBOOTVERSION Configuration"
   7
   8 config UBOOTVERSION
   9         string
  10         option env="UBOOTVERSION"
  11
  12 # Allow defaults in arch-specific code to override any given here
  13 source "arch/Kconfig"
  14
  15 menu "General setup"
  16
  17 config BROKEN
  18         bool
  19         help
  20           This option cannot be enabled. It is used as dependency
  21           for broken and incomplete features.
  22
  23 config DEPRECATED
  24         bool
  25         help
  26           This option cannot be enabled.  It it used as a dependency for
  27           code that relies on deprecated features that will be removed and
  28           the conversion deadline has passed.
  29
  30 config LOCALVERSION
  31         string "Local version - append to U-Boot release"
  32         help
  33           Append an extra string to the end of your U-Boot version.
  34           This will show up in your boot log, for example.
  35           The string you set here will be appended after the contents of
  36           any files with a filename matching localversion* in your
  37           object and source tree, in that order.  Your total string can
  38           be a maximum of 64 characters.
  39
  40 config LOCALVERSION_AUTO
  41         bool "Automatically append version information to the version string"
  42         default y
  43         help
  44           This will try to automatically determine if the current tree is a
  45           release tree by looking for Git tags that belong to the current
  46           top of tree revision.
  47
  48           A string of the format -gxxxxxxxx will be added to the localversion
  49           if a Git-based tree is found.  The string generated by this will be
  50           appended after any matching localversion* files, and after the value
  51           set in CONFIG_LOCALVERSION.
  52
  53           (The actual string used here is the first eight characters produced
  54           by running the command:
  55
  56             $ git rev-parse --verify HEAD
  57
  58           which is done within the script "scripts/setlocalversion".)
  59
  60 config CC_OPTIMIZE_FOR_SIZE
  61         bool "Optimize for size"
  62         default y
  63         help
  64           Enabling this option will pass "-Os" instead of "-O2" to gcc
  65           resulting in a smaller U-Boot image.
  66
  67           This option is enabled by default for U-Boot.
  68
  69 config CC_COVERAGE
  70         bool "Enable code coverage analysis"
  71         depends on SANDBOX
  72         help
  73           Enabling this option will pass "--coverage" to gcc to compile
  74           and link code instrumented for coverage analysis.
  75
  76 config DISTRO_DEFAULTS
  77         bool "Select defaults suitable for booting general purpose Linux distributions"
  78         select AUTO_COMPLETE
  79         select CMDLINE_EDITING
  80         select CMD_BOOTI if ARM64
  81         select CMD_BOOTZ if ARM && !ARM64
  82         select CMD_DHCP if CMD_NET
  83         select CMD_ENV_EXISTS
  84         select CMD_EXT2
  85         select CMD_EXT4
  86         select CMD_FAT
  87         select CMD_FS_GENERIC
  88         select CMD_PART if PARTITIONS
  89         select CMD_PING if CMD_NET
  90         select CMD_PXE if NET
  91         select ENV_VARS_UBOOT_CONFIG
  92         select HUSH_PARSER
  93         select SUPPORT_RAW_INITRD
  94         select SYS_LONGHELP
  95         imply CMD_MII if NET
  96         imply USB_STORAGE
  97         imply USE_BOOTCOMMAND
  98         help
  99           Select this to enable various options and commands which are suitable
 100           for building u-boot for booting general purpose Linux distributions.
 101
 102 config ENV_VARS_UBOOT_CONFIG
 103         bool "Add arch, board, vendor and soc variables to default environment"
 104         help
 105           Define this in order to add variables describing the
 106           U-Boot build configuration to the default environment.
 107           These will be named arch, cpu, board, vendor, and soc.
 108           Enabling this option will cause the following to be defined:
 109           - CONFIG_SYS_ARCH
 110           - CONFIG_SYS_CPU
 111           - CONFIG_SYS_BOARD
 112           - CONFIG_SYS_VENDOR
 113           - CONFIG_SYS_SOC
 114
 115 config NR_DRAM_BANKS
 116         int "Number of DRAM banks"
 117         default 4
 118         help
 119           This defines the number of DRAM banks.
 120
 121 config SYS_BOOT_GET_CMDLINE
 122         bool "Enable kernel command line setup"
 123         help
 124           Enables allocating and saving kernel cmdline in space between
 125           "bootm_low" and "bootm_low" + BOOTMAPSZ.
 126
 127 config SYS_BOOT_GET_KBD
 128         bool "Enable kernel board information setup"
 129         help
 130           Enables allocating and saving a kernel copy of the bd_info in
 131           space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
 132
 133 config SYS_MALLOC_F
 134         bool "Enable malloc() pool before relocation"
 135         default y if DM
 136
 137         help
 138           Before relocation, memory is very limited on many platforms. Still,
 139           we can provide a small malloc() pool if needed. Driver model in
 140           particular needs this to operate, so that it can allocate the
 141           initial serial device and any others that are needed.
 142
 143 config SYS_MALLOC_F_LEN
 144         hex "Size of malloc() pool before relocation"
 145         depends on SYS_MALLOC_F
 146         default 0x1000 if AM33XX
 147         default 0x2800 if SANDBOX
 148         default 0x2000 if (ARCH_IMX8 || ARCH_IMX8M || ARCH_MX7 || \
 149                            ARCH_MX7ULP || ARCH_MX6 || ARCH_MX5)
 150         default 0x400
 151         help
 152           Before relocation, memory is very limited on many platforms. Still,
 153           we can provide a small malloc() pool if needed. Driver model in
 154           particular needs this to operate, so that it can allocate the
 155           initial serial device and any others that are needed.
 156
 157 config SYS_MALLOC_LEN
 158         hex "Define memory for Dynamic allocation"
 159         depends on ARCH_ZYNQ || ARCH_VERSAL || ARCH_STM32MP || ARCH_ROCKCHIP
 160         default 0x2000000 if ARCH_ROCKCHIP
 161         help
 162           This defines memory to be allocated for Dynamic allocation
 163           TODO: Use for other architectures
 164
 165 config SPL_SYS_MALLOC_F_LEN
 166         hex "Size of malloc() pool in SPL before relocation"
 167         depends on SYS_MALLOC_F && SPL
 168         default 0x2800 if RCAR_GEN3
 169         default SYS_MALLOC_F_LEN
 170         help
 171           Before relocation, memory is very limited on many platforms. Still,
 172           we can provide a small malloc() pool if needed. Driver model in
 173           particular needs this to operate, so that it can allocate the
 174           initial serial device and any others that are needed.
 175
 176 config TPL_SYS_MALLOC_F_LEN
 177         hex "Size of malloc() pool in TPL before relocation"
 178         depends on SYS_MALLOC_F && TPL
 179         default SYS_MALLOC_F_LEN
 180         help
 181           Before relocation, memory is very limited on many platforms. Still,
 182           we can provide a small malloc() pool if needed. Driver model in
 183           particular needs this to operate, so that it can allocate the
 184           initial serial device and any others that are needed.
 185
 186 menuconfig EXPERT
 187         bool "Configure standard U-Boot features (expert users)"
 188         default y
 189         help
 190           This option allows certain base U-Boot options and settings
 191           to be disabled or tweaked. This is for specialized
 192           environments which can tolerate a "non-standard" U-Boot.
 193           Use this only if you really know what you are doing.
 194
 195 if EXPERT
 196         config SYS_MALLOC_CLEAR_ON_INIT
 197         bool "Init with zeros the memory reserved for malloc (slow)"
 198         default y
 199         help
 200           This setting is enabled by default. The reserved malloc
 201           memory is initialized with zeros, so first malloc calls
 202           will return the pointer to the zeroed memory. But this
 203           slows the boot time.
 204
 205           It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
 206           value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
 207           Then the boot time can be significantly reduced.
 208           Warning:
 209           When disabling this, please check if malloc calls, maybe
 210           should be replaced by calloc - if one expects zeroed memory.
 211
 212 config TOOLS_DEBUG
 213         bool "Enable debug information for tools"
 214         help
 215           Enable generation of debug information for tools such as mkimage.
 216           This can be used for debugging purposes. With debug information
 217           it is possible to set breakpoints on particular lines, single-step
 218           debug through the source code, etc.
 219
 220 endif # EXPERT
 221
 222 config PHYS_64BIT
 223         bool "64bit physical address support"
 224         help
 225           Say Y here to support 64bit physical memory address.
 226           This can be used not only for 64bit SoCs, but also for
 227           large physical address extension on 32bit SoCs.
 228
 229 config BUILD_ROM
 230         bool "Build U-Boot as BIOS replacement"
 231         depends on X86
 232         help
 233           This option allows to build a ROM version of U-Boot.
 234           The build process generally requires several binary blobs
 235           which are not shipped in the U-Boot source tree.
 236           Please, see doc/README.x86 for details.
 237
 238 config SPL_IMAGE
 239         string "SPL image used in the combined SPL+U-Boot image"
 240         default "spl/boot.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
 241         default "spl/u-boot-spl.bin"
 242         depends on SPL
 243         help
 244           Select the SPL build target that shall be generated by the SPL
 245           build process (default spl/u-boot-spl.bin). This image will be
 246           used to generate a combined image with SPL and main U-Boot
 247           proper as one single image.
 248
 249 config BUILD_TARGET
 250         string "Build target special images"
 251         default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_ARRIA10
 252         default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_GEN5
 253         default "u-boot-spl.kwb" if ARCH_MVEBU && SPL
 254         default "u-boot-elf.srec" if RCAR_GEN3
 255         default "u-boot.itb" if SPL_LOAD_FIT && (ROCKCHIP_RK3399 || \
 256                                 ARCH_SUNXI || RISCV)
 257         default "u-boot.kwb" if KIRKWOOD
 258         default "u-boot-with-spl.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
 259         default "u-boot-with-spl.imx" if ARCH_MX6 && SPL
 260         help
 261           Some SoCs need special image types (e.g. U-Boot binary
 262           with a special header) as build targets. By defining
 263           CONFIG_BUILD_TARGET in the SoC / board header, this
 264           special image will be automatically built upon calling
 265           make / buildman.
 266
 267 config SYS_CUSTOM_LDSCRIPT
 268         bool "Use a custom location for the U-Boot linker script"
 269         help
 270           Normally when linking U-Boot we will look in the board directory,
 271           the CPU directory and finally the "cpu" directory of the architecture
 272           for the ile "u-boot.lds" and use that as our linker.  However, in
 273           some cases we need to provide a different linker script.  To do so,
 274           enable this option and then provide the location under
 275           CONFIG_SYS_LDSCRIPT.
 276
 277 config SYS_LDSCRIPT
 278         depends on SYS_CUSTOM_LDSCRIPT
 279         string "Custom ldscript location"
 280         help
 281           Path within the source tree to the linker script to use for the
 282           main U-Boot binary.
 283
 284 endmenu         # General setup
 285
 286 menu "Boot images"
 287
 288 config ANDROID_BOOT_IMAGE
 289         bool "Enable support for Android Boot Images"
 290         default y if FASTBOOT
 291         help
 292           This enables support for booting images which use the Android
 293           image format header.
 294
 295 config FIT
 296         bool "Support Flattened Image Tree"
 297         select MD5
 298         select SHA1
 299         help
 300           This option allows you to boot the new uImage structure,
 301           Flattened Image Tree.  FIT is formally a FDT, which can include
 302           images of various types (kernel, FDT blob, ramdisk, etc.)
 303           in a single blob.  To boot this new uImage structure,
 304           pass the address of the blob to the "bootm" command.
 305           FIT is very flexible, supporting compression, multiple images,
 306           multiple configurations, verification through hashing and also
 307           verified boot (secure boot using RSA).
 308
 309 if FIT
 310
 311 config FIT_EXTERNAL_OFFSET
 312         hex "FIT external data offset"
 313         default 0x0
 314         help
 315           This specifies a data offset in fit image.
 316           The offset is from data payload offset to the beginning of
 317           fit image header. When specifies a offset, specific data
 318           could be put in the hole between data payload and fit image
 319           header, such as CSF data on i.MX platform.
 320
 321 config FIT_ENABLE_SHA256_SUPPORT
 322         bool "Support SHA256 checksum of FIT image contents"
 323         default y
 324         select SHA256
 325         help
 326           Enable this to support SHA256 checksum of FIT image contents. A
 327           SHA256 checksum is a 256-bit (32-byte) hash value used to check that
 328           the image contents have not been corrupted. SHA256 is recommended
 329           for use in secure applications since (as at 2016) there is no known
 330           feasible attack that could produce a 'collision' with differing
 331           input data. Use this for the highest security. Note that only the
 332           SHA256 variant is supported: SHA512 and others are not currently
 333           supported in U-Boot.
 334
 335 config FIT_SIGNATURE
 336         bool "Enable signature verification of FIT uImages"
 337         depends on DM
 338         select HASH
 339         select RSA
 340         help
 341           This option enables signature verification of FIT uImages,
 342           using a hash signed and verified using RSA. If
 343           CONFIG_SHA_PROG_HW_ACCEL is defined, i.e support for progressive
 344           hashing is available using hardware, then the RSA library will use
 345           it. See doc/uImage.FIT/signature.txt for more details.
 346
 347           WARNING: When relying on signed FIT images with a required signature
 348           check the legacy image format is disabled by default, so that
 349           unsigned images cannot be loaded. If a board needs the legacy image
 350           format support in this case, enable it using
 351           CONFIG_LEGACY_IMAGE_FORMAT.
 352
 353 config FIT_SIGNATURE_MAX_SIZE
 354         hex "Max size of signed FIT structures"
 355         depends on FIT_SIGNATURE
 356         default 0x10000000
 357         help
 358           This option sets a max size in bytes for verified FIT uImages.
 359           A sane value of 256MB protects corrupted DTB structures from overlapping
 360           device memory. Assure this size does not extend past expected storage
 361           space.
 362
 363 config FIT_ENABLE_RSASSA_PSS_SUPPORT
 364         bool "Support rsassa-pss signature scheme of FIT image contents"
 365         depends on FIT_SIGNATURE
 366         default n
 367         help
 368           Enable this to support the pss padding algorithm as described
 369           in the rfc8017 (https://tools.ietf.org/html/rfc8017).
 370
 371 config FIT_VERBOSE
 372         bool "Show verbose messages when FIT images fail"
 373         help
 374           Generally a system will have valid FIT images so debug messages
 375           are a waste of code space. If you are debugging your images then
 376           you can enable this option to get more verbose information about
 377           failures.
 378
 379 config FIT_BEST_MATCH
 380         bool "Select the best match for the kernel device tree"
 381         help
 382           When no configuration is explicitly selected, default to the
 383           one whose fdt's compatibility field best matches that of
 384           U-Boot itself. A match is considered "best" if it matches the
 385           most specific compatibility entry of U-Boot's fdt's root node.
 386           The order of entries in the configuration's fdt is ignored.
 387
 388 config FIT_IMAGE_POST_PROCESS
 389         bool "Enable post-processing of FIT artifacts after loading by U-Boot"
 390         depends on TI_SECURE_DEVICE
 391         help
 392           Allows doing any sort of manipulation to blobs after they got extracted
 393           from FIT images like stripping off headers or modifying the size of the
 394           blob, verification, authentication, decryption etc. in a platform or
 395           board specific way. In order to use this feature a platform or board-
 396           specific implementation of board_fit_image_post_process() must be
 397           provided. Also, anything done during this post-processing step would
 398           need to be comprehended in how the images were prepared before being
 399           injected into the FIT creation (i.e. the blobs would have been pre-
 400           processed before being added to the FIT image).
 401
 402 if SPL
 403
 404 config SPL_FIT
 405         bool "Support Flattened Image Tree within SPL"
 406         depends on SPL
 407         select SPL_OF_LIBFDT
 408
 409 config SPL_FIT_PRINT
 410         bool "Support FIT printing within SPL"
 411         depends on SPL_FIT
 412         help
 413           Support printing the content of the fitImage in a verbose manner in SPL.
 414
 415 config SPL_FIT_SIGNATURE
 416         bool "Enable signature verification of FIT firmware within SPL"
 417         depends on SPL_DM
 418         select SPL_FIT
 419         select SPL_RSA
 420
 421 config SPL_LOAD_FIT
 422         bool "Enable SPL loading U-Boot as a FIT (basic fitImage features)"
 423         select SPL_FIT
 424         help
 425           Normally with the SPL framework a legacy image is generated as part
 426           of the build. This contains U-Boot along with information as to
 427           where it should be loaded. This option instead enables generation
 428           of a FIT (Flat Image Tree) which provides more flexibility. In
 429           particular it can handle selecting from multiple device tree
 430           and passing the correct one to U-Boot.
 431
 432 config SPL_LOAD_FIT_FULL
 433         bool "Enable SPL loading U-Boot as a FIT (full fitImage features)"
 434         select SPL_FIT
 435         help
 436           Normally with the SPL framework a legacy image is generated as part
 437           of the build. This contains U-Boot along with information as to
 438           where it should be loaded. This option instead enables generation
 439           of a FIT (Flat Image Tree) which provides more flexibility. In
 440           particular it can handle selecting from multiple device tree
 441           and passing the correct one to U-Boot.
 442
 443 config SPL_FIT_IMAGE_POST_PROCESS
 444         bool "Enable post-processing of FIT artifacts after loading by the SPL"
 445         depends on SPL_LOAD_FIT
 446         help
 447           Allows doing any sort of manipulation to blobs after they got extracted
 448           from the U-Boot FIT image like stripping off headers or modifying the
 449           size of the blob, verification, authentication, decryption etc. in a
 450           platform or board specific way. In order to use this feature a platform
 451           or board-specific implementation of board_fit_image_post_process() must
 452           be provided. Also, anything done during this post-processing step would
 453           need to be comprehended in how the images were prepared before being
 454           injected into the FIT creation (i.e. the blobs would have been pre-
 455           processed before being added to the FIT image).
 456
 457 config SPL_FIT_SOURCE
 458         string ".its source file for U-Boot FIT image"
 459         depends on SPL_FIT
 460         help
 461           Specifies a (platform specific) FIT source file to generate the
 462           U-Boot FIT image. This could specify further image to load and/or
 463           execute.
 464
 465 config SPL_FIT_GENERATOR
 466         string ".its file generator script for U-Boot FIT image"
 467         depends on SPL_FIT
 468         default "board/sunxi/mksunxi_fit_atf.sh" if SPL_LOAD_FIT && ARCH_SUNXI
 469         default "arch/arm/mach-rockchip/make_fit_atf.py" if SPL_LOAD_FIT && ARCH_ROCKCHIP
 470         default "arch/riscv/lib/mkimage_fit_opensbi.sh" if SPL_LOAD_FIT && RISCV
 471         help
 472           Specifies a (platform specific) script file to generate the FIT
 473           source file used to build the U-Boot FIT image file. This gets
 474           passed a list of supported device tree file stub names to
 475           include in the generated image.
 476
 477 endif # SPL
 478
 479 endif # FIT
 480
 481 config LEGACY_IMAGE_FORMAT
 482         bool "Enable support for the legacy image format"
 483         default y if !FIT_SIGNATURE
 484         help
 485           This option enables the legacy image format. It is enabled by
 486           default for backward compatibility, unless FIT_SIGNATURE is
 487           set where it is disabled so that unsigned images cannot be
 488           loaded. If a board needs the legacy image format support in this
 489           case, enable it here.
 490
 491 config OF_BOARD_SETUP
 492         bool "Set up board-specific details in device tree before boot"
 493         depends on OF_LIBFDT
 494         help
 495           This causes U-Boot to call ft_board_setup() before booting into
 496           the Operating System. This function can set up various
 497           board-specific information in the device tree for use by the OS.
 498           The device tree is then passed to the OS.
 499
 500 config OF_SYSTEM_SETUP
 501         bool "Set up system-specific details in device tree before boot"
 502         depends on OF_LIBFDT
 503         help
 504           This causes U-Boot to call ft_system_setup() before booting into
 505           the Operating System. This function can set up various
 506           system-specific information in the device tree for use by the OS.
 507           The device tree is then passed to the OS.
 508
 509 config OF_STDOUT_VIA_ALIAS
 510         bool "Update the device-tree stdout alias from U-Boot"
 511         depends on OF_LIBFDT
 512         help
 513           This uses U-Boot's serial alias from the aliases node to update
 514           the device tree passed to the OS. The "linux,stdout-path" property
 515           in the chosen node is set to point to the correct serial node.
 516           This option currently references CONFIG_CONS_INDEX, which is
 517           incorrect when used with device tree as this option does not
 518           exist / should not be used.
 519
 520 config SYS_EXTRA_OPTIONS
 521         string "Extra Options (DEPRECATED)"
 522         help
 523           The old configuration infrastructure (= mkconfig + boards.cfg)
 524           provided the extra options field. If you have something like
 525           "HAS_BAR,BAZ=64", the optional options
 526             #define CONFIG_HAS
 527             #define CONFIG_BAZ  64
 528           will be defined in include/config.h.
 529           This option was prepared for the smooth migration from the old
 530           configuration to Kconfig. Since this option will be removed sometime,
 531           new boards should not use this option.
 532
 533 config SYS_TEXT_BASE
 534         depends on !NIOS2 && !XTENSA
 535         depends on !EFI_APP
 536         default 0x80800000 if ARCH_OMAP2PLUS || ARCH_K3
 537         default 0x4a000000 if ARCH_SUNXI && !MACH_SUN9I && !MACH_SUN8I_V3S
 538         default 0x2a000000 if ARCH_SUNXI && MACH_SUN9I
 539         default 0x42e00000 if ARCH_SUNXI && MACH_SUN8I_V3S
 540         hex "Text Base"
 541         help
 542           The address in memory that U-Boot will be running from, initially.
 543
 544
 545
 546 config SYS_CLK_FREQ
 547         depends on ARC || ARCH_SUNXI || MPC83xx
 548         int "CPU clock frequency"
 549         help
 550           TODO: Move CONFIG_SYS_CLK_FREQ for all the architecture
 551
 552 config ARCH_FIXUP_FDT_MEMORY
 553         bool "Enable arch_fixup_memory_banks() call"
 554         default y
 555         help
 556           Enable FDT memory map syncup before OS boot. This feature can be
 557           used for booting OS with different memory setup where the part of
 558           the memory location should be used for different purpose.
 559
 560 endmenu         # Boot images
 561
 562 source "api/Kconfig"
 563
 564 source "common/Kconfig"
 565
 566 source "cmd/Kconfig"
 567
 568 source "disk/Kconfig"
 569
 570 source "dts/Kconfig"
 571
 572 source "env/Kconfig"
 573
 574 source "net/Kconfig"
 575
 576 source "drivers/Kconfig"
 577
 578 source "fs/Kconfig"
 579
 580 source "lib/Kconfig"
 581
 582 source "test/Kconfig"