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 config ERR_PTR_OFFSET
 285         hex
 286         default 0x0
 287         help
 288           Some U-Boot pointers have redundant information, so we can use a
 289           scheme where we can return either an error code or a pointer with the
 290           same return value. The default implementation just casts the pointer
 291           to a number, however, this may fail on platforms where the end of the
 292           address range is used for valid pointers (e.g. 0xffffff00 is a valid
 293           heap pointer in socfpga SPL).
 294           For such platforms, this value provides an upper range of those error
 295           pointer values - up to 'MAX_ERRNO' bytes below this value must be
 296           unused/invalid addresses.
 297
 298 endmenu         # General setup
 299
 300 menu "Boot images"
 301
 302 config ANDROID_BOOT_IMAGE
 303         bool "Enable support for Android Boot Images"
 304         default y if FASTBOOT
 305         help
 306           This enables support for booting images which use the Android
 307           image format header.
 308
 309 config FIT
 310         bool "Support Flattened Image Tree"
 311         select MD5
 312         select SHA1
 313         help
 314           This option allows you to boot the new uImage structure,
 315           Flattened Image Tree.  FIT is formally a FDT, which can include
 316           images of various types (kernel, FDT blob, ramdisk, etc.)
 317           in a single blob.  To boot this new uImage structure,
 318           pass the address of the blob to the "bootm" command.
 319           FIT is very flexible, supporting compression, multiple images,
 320           multiple configurations, verification through hashing and also
 321           verified boot (secure boot using RSA).
 322
 323 if FIT
 324
 325 config FIT_EXTERNAL_OFFSET
 326         hex "FIT external data offset"
 327         default 0x0
 328         help
 329           This specifies a data offset in fit image.
 330           The offset is from data payload offset to the beginning of
 331           fit image header. When specifies a offset, specific data
 332           could be put in the hole between data payload and fit image
 333           header, such as CSF data on i.MX platform.
 334
 335 config FIT_ENABLE_SHA256_SUPPORT
 336         bool "Support SHA256 checksum of FIT image contents"
 337         default y
 338         select SHA256
 339         help
 340           Enable this to support SHA256 checksum of FIT image contents. A
 341           SHA256 checksum is a 256-bit (32-byte) hash value used to check that
 342           the image contents have not been corrupted. SHA256 is recommended
 343           for use in secure applications since (as at 2016) there is no known
 344           feasible attack that could produce a 'collision' with differing
 345           input data. Use this for the highest security. Note that only the
 346           SHA256 variant is supported: SHA512 and others are not currently
 347           supported in U-Boot.
 348
 349 config FIT_SIGNATURE
 350         bool "Enable signature verification of FIT uImages"
 351         depends on DM
 352         select HASH
 353         select RSA
 354         help
 355           This option enables signature verification of FIT uImages,
 356           using a hash signed and verified using RSA. If
 357           CONFIG_SHA_PROG_HW_ACCEL is defined, i.e support for progressive
 358           hashing is available using hardware, then the RSA library will use
 359           it. See doc/uImage.FIT/signature.txt for more details.
 360
 361           WARNING: When relying on signed FIT images with a required signature
 362           check the legacy image format is disabled by default, so that
 363           unsigned images cannot be loaded. If a board needs the legacy image
 364           format support in this case, enable it using
 365           CONFIG_LEGACY_IMAGE_FORMAT.
 366
 367 config FIT_SIGNATURE_MAX_SIZE
 368         hex "Max size of signed FIT structures"
 369         depends on FIT_SIGNATURE
 370         default 0x10000000
 371         help
 372           This option sets a max size in bytes for verified FIT uImages.
 373           A sane value of 256MB protects corrupted DTB structures from overlapping
 374           device memory. Assure this size does not extend past expected storage
 375           space.
 376
 377 config FIT_ENABLE_RSASSA_PSS_SUPPORT
 378         bool "Support rsassa-pss signature scheme of FIT image contents"
 379         depends on FIT_SIGNATURE
 380         default n
 381         help
 382           Enable this to support the pss padding algorithm as described
 383           in the rfc8017 (https://tools.ietf.org/html/rfc8017).
 384
 385 config FIT_VERBOSE
 386         bool "Show verbose messages when FIT images fail"
 387         help
 388           Generally a system will have valid FIT images so debug messages
 389           are a waste of code space. If you are debugging your images then
 390           you can enable this option to get more verbose information about
 391           failures.
 392
 393 config FIT_BEST_MATCH
 394         bool "Select the best match for the kernel device tree"
 395         help
 396           When no configuration is explicitly selected, default to the
 397           one whose fdt's compatibility field best matches that of
 398           U-Boot itself. A match is considered "best" if it matches the
 399           most specific compatibility entry of U-Boot's fdt's root node.
 400           The order of entries in the configuration's fdt is ignored.
 401
 402 config FIT_IMAGE_POST_PROCESS
 403         bool "Enable post-processing of FIT artifacts after loading by U-Boot"
 404         depends on TI_SECURE_DEVICE
 405         help
 406           Allows doing any sort of manipulation to blobs after they got extracted
 407           from FIT images like stripping off headers or modifying the size of the
 408           blob, verification, authentication, decryption etc. in a platform or
 409           board specific way. In order to use this feature a platform or board-
 410           specific implementation of board_fit_image_post_process() must be
 411           provided. Also, anything done during this post-processing step would
 412           need to be comprehended in how the images were prepared before being
 413           injected into the FIT creation (i.e. the blobs would have been pre-
 414           processed before being added to the FIT image).
 415
 416 if SPL
 417
 418 config SPL_FIT
 419         bool "Support Flattened Image Tree within SPL"
 420         depends on SPL
 421         select SPL_OF_LIBFDT
 422
 423 config SPL_FIT_PRINT
 424         bool "Support FIT printing within SPL"
 425         depends on SPL_FIT
 426         help
 427           Support printing the content of the fitImage in a verbose manner in SPL.
 428
 429 config SPL_FIT_SIGNATURE
 430         bool "Enable signature verification of FIT firmware within SPL"
 431         depends on SPL_DM
 432         select SPL_FIT
 433         select SPL_RSA
 434
 435 config SPL_LOAD_FIT
 436         bool "Enable SPL loading U-Boot as a FIT (basic fitImage features)"
 437         select SPL_FIT
 438         help
 439           Normally with the SPL framework a legacy image is generated as part
 440           of the build. This contains U-Boot along with information as to
 441           where it should be loaded. This option instead enables generation
 442           of a FIT (Flat Image Tree) which provides more flexibility. In
 443           particular it can handle selecting from multiple device tree
 444           and passing the correct one to U-Boot.
 445
 446 config SPL_LOAD_FIT_FULL
 447         bool "Enable SPL loading U-Boot as a FIT (full fitImage features)"
 448         select SPL_FIT
 449         help
 450           Normally with the SPL framework a legacy image is generated as part
 451           of the build. This contains U-Boot along with information as to
 452           where it should be loaded. This option instead enables generation
 453           of a FIT (Flat Image Tree) which provides more flexibility. In
 454           particular it can handle selecting from multiple device tree
 455           and passing the correct one to U-Boot.
 456
 457 config SPL_FIT_IMAGE_POST_PROCESS
 458         bool "Enable post-processing of FIT artifacts after loading by the SPL"
 459         depends on SPL_LOAD_FIT
 460         help
 461           Allows doing any sort of manipulation to blobs after they got extracted
 462           from the U-Boot FIT image like stripping off headers or modifying the
 463           size of the blob, verification, authentication, decryption etc. in a
 464           platform or board specific way. In order to use this feature a platform
 465           or board-specific implementation of board_fit_image_post_process() must
 466           be provided. Also, anything done during this post-processing step would
 467           need to be comprehended in how the images were prepared before being
 468           injected into the FIT creation (i.e. the blobs would have been pre-
 469           processed before being added to the FIT image).
 470
 471 config SPL_FIT_SOURCE
 472         string ".its source file for U-Boot FIT image"
 473         depends on SPL_FIT
 474         help
 475           Specifies a (platform specific) FIT source file to generate the
 476           U-Boot FIT image. This could specify further image to load and/or
 477           execute.
 478
 479 config SPL_FIT_GENERATOR
 480         string ".its file generator script for U-Boot FIT image"
 481         depends on SPL_FIT
 482         default "board/sunxi/mksunxi_fit_atf.sh" if SPL_LOAD_FIT && ARCH_SUNXI
 483         default "arch/arm/mach-rockchip/make_fit_atf.py" if SPL_LOAD_FIT && ARCH_ROCKCHIP
 484         default "arch/riscv/lib/mkimage_fit_opensbi.sh" if SPL_LOAD_FIT && RISCV
 485         help
 486           Specifies a (platform specific) script file to generate the FIT
 487           source file used to build the U-Boot FIT image file. This gets
 488           passed a list of supported device tree file stub names to
 489           include in the generated image.
 490
 491 endif # SPL
 492
 493 endif # FIT
 494
 495 config LEGACY_IMAGE_FORMAT
 496         bool "Enable support for the legacy image format"
 497         default y if !FIT_SIGNATURE
 498         help
 499           This option enables the legacy image format. It is enabled by
 500           default for backward compatibility, unless FIT_SIGNATURE is
 501           set where it is disabled so that unsigned images cannot be
 502           loaded. If a board needs the legacy image format support in this
 503           case, enable it here.
 504
 505 config OF_BOARD_SETUP
 506         bool "Set up board-specific details in device tree before boot"
 507         depends on OF_LIBFDT
 508         help
 509           This causes U-Boot to call ft_board_setup() before booting into
 510           the Operating System. This function can set up various
 511           board-specific information in the device tree for use by the OS.
 512           The device tree is then passed to the OS.
 513
 514 config OF_SYSTEM_SETUP
 515         bool "Set up system-specific details in device tree before boot"
 516         depends on OF_LIBFDT
 517         help
 518           This causes U-Boot to call ft_system_setup() before booting into
 519           the Operating System. This function can set up various
 520           system-specific information in the device tree for use by the OS.
 521           The device tree is then passed to the OS.
 522
 523 config OF_STDOUT_VIA_ALIAS
 524         bool "Update the device-tree stdout alias from U-Boot"
 525         depends on OF_LIBFDT
 526         help
 527           This uses U-Boot's serial alias from the aliases node to update
 528           the device tree passed to the OS. The "linux,stdout-path" property
 529           in the chosen node is set to point to the correct serial node.
 530           This option currently references CONFIG_CONS_INDEX, which is
 531           incorrect when used with device tree as this option does not
 532           exist / should not be used.
 533
 534 config SYS_EXTRA_OPTIONS
 535         string "Extra Options (DEPRECATED)"
 536         help
 537           The old configuration infrastructure (= mkconfig + boards.cfg)
 538           provided the extra options field. If you have something like
 539           "HAS_BAR,BAZ=64", the optional options
 540             #define CONFIG_HAS
 541             #define CONFIG_BAZ  64
 542           will be defined in include/config.h.
 543           This option was prepared for the smooth migration from the old
 544           configuration to Kconfig. Since this option will be removed sometime,
 545           new boards should not use this option.
 546
 547 config SYS_TEXT_BASE
 548         depends on !NIOS2 && !XTENSA
 549         depends on !EFI_APP
 550         default 0x80800000 if ARCH_OMAP2PLUS || ARCH_K3
 551         default 0x4a000000 if ARCH_SUNXI && !MACH_SUN9I && !MACH_SUN8I_V3S
 552         default 0x2a000000 if ARCH_SUNXI && MACH_SUN9I
 553         default 0x42e00000 if ARCH_SUNXI && MACH_SUN8I_V3S
 554         hex "Text Base"
 555         help
 556           The address in memory that U-Boot will be running from, initially.
 557
 558
 559
 560 config SYS_CLK_FREQ
 561         depends on ARC || ARCH_SUNXI || MPC83xx
 562         int "CPU clock frequency"
 563         help
 564           TODO: Move CONFIG_SYS_CLK_FREQ for all the architecture
 565
 566 config ARCH_FIXUP_FDT_MEMORY
 567         bool "Enable arch_fixup_memory_banks() call"
 568         default y
 569         help
 570           Enable FDT memory map syncup before OS boot. This feature can be
 571           used for booting OS with different memory setup where the part of
 572           the memory location should be used for different purpose.
 573
 574 endmenu         # Boot images
 575
 576 source "api/Kconfig"
 577
 578 source "common/Kconfig"
 579
 580 source "cmd/Kconfig"
 581
 582 source "disk/Kconfig"
 583
 584 source "dts/Kconfig"
 585
 586 source "env/Kconfig"
 587
 588 source "net/Kconfig"
 589
 590 source "drivers/Kconfig"
 591
 592 source "fs/Kconfig"
 593
 594 source "lib/Kconfig"
 595
 596 source "test/Kconfig"