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
 160         help
 161           This defines memory to be allocated for Dynamic allocation
 162           TODO: Use for other architectures
 163
 164 config SPL_SYS_MALLOC_F_LEN
 165         hex "Size of malloc() pool in SPL before relocation"
 166         depends on SYS_MALLOC_F
 167         default 0x2800 if RCAR_GEN3
 168         default SYS_MALLOC_F_LEN
 169         help
 170           Before relocation, memory is very limited on many platforms. Still,
 171           we can provide a small malloc() pool if needed. Driver model in
 172           particular needs this to operate, so that it can allocate the
 173           initial serial device and any others that are needed.
 174
 175 config TPL_SYS_MALLOC_F_LEN
 176         hex "Size of malloc() pool in TPL before relocation"
 177         depends on SYS_MALLOC_F
 178         default SYS_MALLOC_F_LEN
 179         help
 180           Before relocation, memory is very limited on many platforms. Still,
 181           we can provide a small malloc() pool if needed. Driver model in
 182           particular needs this to operate, so that it can allocate the
 183           initial serial device and any others that are needed.
 184
 185 menuconfig EXPERT
 186         bool "Configure standard U-Boot features (expert users)"
 187         default y
 188         help
 189           This option allows certain base U-Boot options and settings
 190           to be disabled or tweaked. This is for specialized
 191           environments which can tolerate a "non-standard" U-Boot.
 192           Use this only if you really know what you are doing.
 193
 194 if EXPERT
 195         config SYS_MALLOC_CLEAR_ON_INIT
 196         bool "Init with zeros the memory reserved for malloc (slow)"
 197         default y
 198         help
 199           This setting is enabled by default. The reserved malloc
 200           memory is initialized with zeros, so first malloc calls
 201           will return the pointer to the zeroed memory. But this
 202           slows the boot time.
 203
 204           It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
 205           value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
 206           Then the boot time can be significantly reduced.
 207           Warning:
 208           When disabling this, please check if malloc calls, maybe
 209           should be replaced by calloc - if one expects zeroed memory.
 210
 211 config TOOLS_DEBUG
 212         bool "Enable debug information for tools"
 213         help
 214           Enable generation of debug information for tools such as mkimage.
 215           This can be used for debugging purposes. With debug information
 216           it is possible to set breakpoints on particular lines, single-step
 217           debug through the source code, etc.
 218
 219 endif # EXPERT
 220
 221 config PHYS_64BIT
 222         bool "64bit physical address support"
 223         help
 224           Say Y here to support 64bit physical memory address.
 225           This can be used not only for 64bit SoCs, but also for
 226           large physical address extension on 32bit SoCs.
 227
 228 config BUILD_ROM
 229         bool "Build U-Boot as BIOS replacement"
 230         depends on X86
 231         help
 232           This option allows to build a ROM version of U-Boot.
 233           The build process generally requires several binary blobs
 234           which are not shipped in the U-Boot source tree.
 235           Please, see doc/README.x86 for details.
 236
 237 config SPL_IMAGE
 238         string "SPL image used in the combined SPL+U-Boot image"
 239         default "spl/boot.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
 240         default "spl/u-boot-spl.bin"
 241         help
 242           Select the SPL build target that shall be generated by the SPL
 243           build process (default spl/u-boot-spl.bin). This image will be
 244           used to generate a combined image with SPL and main U-Boot
 245           proper as one single image.
 246
 247 config BUILD_TARGET
 248         string "Build target special images"
 249         default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_ARRIA10
 250         default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_GEN5
 251         default "u-boot-spl.kwb" if ARCH_MVEBU && SPL
 252         default "u-boot-elf.srec" if RCAR_GEN3
 253         default "u-boot.itb" if SPL_LOAD_FIT && (ROCKCHIP_RK3399 || ARCH_SUNXI)
 254         default "u-boot.kwb" if KIRKWOOD
 255         default "u-boot-with-spl.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
 256         help
 257           Some SoCs need special image types (e.g. U-Boot binary
 258           with a special header) as build targets. By defining
 259           CONFIG_BUILD_TARGET in the SoC / board header, this
 260           special image will be automatically built upon calling
 261           make / buildman.
 262
 263 config SYS_CUSTOM_LDSCRIPT
 264         bool "Use a custom location for the U-Boot linker script"
 265         help
 266           Normally when linking U-Boot we will look in the board directory,
 267           the CPU directory and finally the "cpu" directory of the architecture
 268           for the ile "u-boot.lds" and use that as our linker.  However, in
 269           some cases we need to provide a different linker script.  To do so,
 270           enable this option and then provide the location under
 271           CONFIG_SYS_LDSCRIPT.
 272
 273 config SYS_LDSCRIPT
 274         depends on SYS_CUSTOM_LDSCRIPT
 275         string "Custom ldscript location"
 276         help
 277           Path within the source tree to the linker script to use for the
 278           main U-Boot binary.
 279
 280 endmenu         # General setup
 281
 282 menu "Boot images"
 283
 284 config ANDROID_BOOT_IMAGE
 285         bool "Enable support for Android Boot Images"
 286         default y if FASTBOOT
 287         help
 288           This enables support for booting images which use the Android
 289           image format header.
 290
 291 config FIT
 292         bool "Support Flattened Image Tree"
 293         select MD5
 294         select SHA1
 295         help
 296           This option allows you to boot the new uImage structure,
 297           Flattened Image Tree.  FIT is formally a FDT, which can include
 298           images of various types (kernel, FDT blob, ramdisk, etc.)
 299           in a single blob.  To boot this new uImage structure,
 300           pass the address of the blob to the "bootm" command.
 301           FIT is very flexible, supporting compression, multiple images,
 302           multiple configurations, verification through hashing and also
 303           verified boot (secure boot using RSA).
 304
 305 if FIT
 306
 307 config FIT_EXTERNAL_OFFSET
 308         hex "FIT external data offset"
 309         default 0x0
 310         help
 311           This specifies a data offset in fit image.
 312           The offset is from data payload offset to the beginning of
 313           fit image header. When specifies a offset, specific data
 314           could be put in the hole between data payload and fit image
 315           header, such as CSF data on i.MX platform.
 316
 317 config FIT_ENABLE_SHA256_SUPPORT
 318         bool "Support SHA256 checksum of FIT image contents"
 319         default y
 320         select SHA256
 321         help
 322           Enable this to support SHA256 checksum of FIT image contents. A
 323           SHA256 checksum is a 256-bit (32-byte) hash value used to check that
 324           the image contents have not been corrupted. SHA256 is recommended
 325           for use in secure applications since (as at 2016) there is no known
 326           feasible attack that could produce a 'collision' with differing
 327           input data. Use this for the highest security. Note that only the
 328           SHA256 variant is supported: SHA512 and others are not currently
 329           supported in U-Boot.
 330
 331 config FIT_SIGNATURE
 332         bool "Enable signature verification of FIT uImages"
 333         depends on DM
 334         select HASH
 335         select RSA
 336         help
 337           This option enables signature verification of FIT uImages,
 338           using a hash signed and verified using RSA. If
 339           CONFIG_SHA_PROG_HW_ACCEL is defined, i.e support for progressive
 340           hashing is available using hardware, then the RSA library will use
 341           it. See doc/uImage.FIT/signature.txt for more details.
 342
 343           WARNING: When relying on signed FIT images with a required signature
 344           check the legacy image format is disabled by default, so that
 345           unsigned images cannot be loaded. If a board needs the legacy image
 346           format support in this case, enable it using
 347           CONFIG_LEGACY_IMAGE_FORMAT.
 348
 349 config FIT_SIGNATURE_MAX_SIZE
 350         hex "Max size of signed FIT structures"
 351         depends on FIT_SIGNATURE
 352         default 0x10000000
 353         help
 354           This option sets a max size in bytes for verified FIT uImages.
 355           A sane value of 256MB protects corrupted DTB structures from overlapping
 356           device memory. Assure this size does not extend past expected storage
 357           space.
 358
 359 config FIT_ENABLE_RSASSA_PSS_SUPPORT
 360         bool "Support rsassa-pss signature scheme of FIT image contents"
 361         depends on FIT_SIGNATURE
 362         default n
 363         help
 364           Enable this to support the pss padding algorithm as described
 365           in the rfc8017 (https://tools.ietf.org/html/rfc8017).
 366
 367 config FIT_VERBOSE
 368         bool "Show verbose messages when FIT images fail"
 369         help
 370           Generally a system will have valid FIT images so debug messages
 371           are a waste of code space. If you are debugging your images then
 372           you can enable this option to get more verbose information about
 373           failures.
 374
 375 config FIT_BEST_MATCH
 376         bool "Select the best match for the kernel device tree"
 377         help
 378           When no configuration is explicitly selected, default to the
 379           one whose fdt's compatibility field best matches that of
 380           U-Boot itself. A match is considered "best" if it matches the
 381           most specific compatibility entry of U-Boot's fdt's root node.
 382           The order of entries in the configuration's fdt is ignored.
 383
 384 config FIT_IMAGE_POST_PROCESS
 385         bool "Enable post-processing of FIT artifacts after loading by U-Boot"
 386         depends on TI_SECURE_DEVICE
 387         help
 388           Allows doing any sort of manipulation to blobs after they got extracted
 389           from FIT images like stripping off headers or modifying the size of the
 390           blob, verification, authentication, decryption etc. in a platform or
 391           board specific way. In order to use this feature a platform or board-
 392           specific implementation of board_fit_image_post_process() must be
 393           provided. Also, anything done during this post-processing step would
 394           need to be comprehended in how the images were prepared before being
 395           injected into the FIT creation (i.e. the blobs would have been pre-
 396           processed before being added to the FIT image).
 397
 398 if SPL
 399
 400 config SPL_FIT
 401         bool "Support Flattened Image Tree within SPL"
 402         depends on SPL
 403         select SPL_OF_LIBFDT
 404
 405 config SPL_FIT_PRINT
 406         bool "Support FIT printing within SPL"
 407         depends on SPL_FIT
 408         help
 409           Support printing the content of the fitImage in a verbose manner in SPL.
 410
 411 config SPL_FIT_SIGNATURE
 412         bool "Enable signature verification of FIT firmware within SPL"
 413         depends on SPL_DM
 414         select SPL_FIT
 415         select SPL_RSA
 416
 417 config SPL_LOAD_FIT
 418         bool "Enable SPL loading U-Boot as a FIT (basic fitImage features)"
 419         select SPL_FIT
 420         help
 421           Normally with the SPL framework a legacy image is generated as part
 422           of the build. This contains U-Boot along with information as to
 423           where it should be loaded. This option instead enables generation
 424           of a FIT (Flat Image Tree) which provides more flexibility. In
 425           particular it can handle selecting from multiple device tree
 426           and passing the correct one to U-Boot.
 427
 428 config SPL_LOAD_FIT_FULL
 429         bool "Enable SPL loading U-Boot as a FIT (full fitImage features)"
 430         select SPL_FIT
 431         help
 432           Normally with the SPL framework a legacy image is generated as part
 433           of the build. This contains U-Boot along with information as to
 434           where it should be loaded. This option instead enables generation
 435           of a FIT (Flat Image Tree) which provides more flexibility. In
 436           particular it can handle selecting from multiple device tree
 437           and passing the correct one to U-Boot.
 438
 439 config SPL_FIT_IMAGE_POST_PROCESS
 440         bool "Enable post-processing of FIT artifacts after loading by the SPL"
 441         depends on SPL_LOAD_FIT
 442         help
 443           Allows doing any sort of manipulation to blobs after they got extracted
 444           from the U-Boot FIT image like stripping off headers or modifying the
 445           size of the blob, verification, authentication, decryption etc. in a
 446           platform or board specific way. In order to use this feature a platform
 447           or board-specific implementation of board_fit_image_post_process() must
 448           be provided. Also, anything done during this post-processing step would
 449           need to be comprehended in how the images were prepared before being
 450           injected into the FIT creation (i.e. the blobs would have been pre-
 451           processed before being added to the FIT image).
 452
 453 config SPL_FIT_SOURCE
 454         string ".its source file for U-Boot FIT image"
 455         depends on SPL_FIT
 456         help
 457           Specifies a (platform specific) FIT source file to generate the
 458           U-Boot FIT image. This could specify further image to load and/or
 459           execute.
 460
 461 config SPL_FIT_GENERATOR
 462         string ".its file generator script for U-Boot FIT image"
 463         depends on SPL_FIT
 464         default "board/sunxi/mksunxi_fit_atf.sh" if SPL_LOAD_FIT && ARCH_SUNXI
 465         default "arch/arm/mach-rockchip/make_fit_atf.py" if SPL_LOAD_FIT && ARCH_ROCKCHIP
 466         help
 467           Specifies a (platform specific) script file to generate the FIT
 468           source file used to build the U-Boot FIT image file. This gets
 469           passed a list of supported device tree file stub names to
 470           include in the generated image.
 471
 472 endif # SPL
 473
 474 endif # FIT
 475
 476 config LEGACY_IMAGE_FORMAT
 477         bool "Enable support for the legacy image format"
 478         default y if !FIT_SIGNATURE
 479         help
 480           This option enables the legacy image format. It is enabled by
 481           default for backward compatibility, unless FIT_SIGNATURE is
 482           set where it is disabled so that unsigned images cannot be
 483           loaded. If a board needs the legacy image format support in this
 484           case, enable it here.
 485
 486 config OF_BOARD_SETUP
 487         bool "Set up board-specific details in device tree before boot"
 488         depends on OF_LIBFDT
 489         help
 490           This causes U-Boot to call ft_board_setup() before booting into
 491           the Operating System. This function can set up various
 492           board-specific information in the device tree for use by the OS.
 493           The device tree is then passed to the OS.
 494
 495 config OF_SYSTEM_SETUP
 496         bool "Set up system-specific details in device tree before boot"
 497         depends on OF_LIBFDT
 498         help
 499           This causes U-Boot to call ft_system_setup() before booting into
 500           the Operating System. This function can set up various
 501           system-specific information in the device tree for use by the OS.
 502           The device tree is then passed to the OS.
 503
 504 config OF_STDOUT_VIA_ALIAS
 505         bool "Update the device-tree stdout alias from U-Boot"
 506         depends on OF_LIBFDT
 507         help
 508           This uses U-Boot's serial alias from the aliases node to update
 509           the device tree passed to the OS. The "linux,stdout-path" property
 510           in the chosen node is set to point to the correct serial node.
 511           This option currently references CONFIG_CONS_INDEX, which is
 512           incorrect when used with device tree as this option does not
 513           exist / should not be used.
 514
 515 config SYS_EXTRA_OPTIONS
 516         string "Extra Options (DEPRECATED)"
 517         help
 518           The old configuration infrastructure (= mkconfig + boards.cfg)
 519           provided the extra options field. If you have something like
 520           "HAS_BAR,BAZ=64", the optional options
 521             #define CONFIG_HAS
 522             #define CONFIG_BAZ  64
 523           will be defined in include/config.h.
 524           This option was prepared for the smooth migration from the old
 525           configuration to Kconfig. Since this option will be removed sometime,
 526           new boards should not use this option.
 527
 528 config SYS_TEXT_BASE
 529         depends on !NIOS2 && !XTENSA
 530         depends on !EFI_APP
 531         default 0x80800000 if ARCH_OMAP2PLUS || ARCH_K3
 532         default 0x4a000000 if ARCH_SUNXI && !MACH_SUN9I && !MACH_SUN8I_V3S
 533         default 0x2a000000 if ARCH_SUNXI && MACH_SUN9I
 534         default 0x42e00000 if ARCH_SUNXI && MACH_SUN8I_V3S
 535         hex "Text Base"
 536         help
 537           The address in memory that U-Boot will be running from, initially.
 538
 539
 540
 541 config SYS_CLK_FREQ
 542         depends on ARC || ARCH_SUNXI || MPC83xx
 543         int "CPU clock frequency"
 544         help
 545           TODO: Move CONFIG_SYS_CLK_FREQ for all the architecture
 546
 547 config ARCH_FIXUP_FDT_MEMORY
 548         bool "Enable arch_fixup_memory_banks() call"
 549         default y
 550         help
 551           Enable FDT memory map syncup before OS boot. This feature can be
 552           used for booting OS with different memory setup where the part of
 553           the memory location should be used for different purpose.
 554
 555 endmenu         # Boot images
 556
 557 source "api/Kconfig"
 558
 559 source "common/Kconfig"
 560
 561 source "cmd/Kconfig"
 562
 563 source "disk/Kconfig"
 564
 565 source "dts/Kconfig"
 566
 567 source "env/Kconfig"
 568
 569 source "net/Kconfig"
 570
 571 source "drivers/Kconfig"
 572
 573 source "fs/Kconfig"
 574
 575 source "lib/Kconfig"
 576
 577 source "test/Kconfig"