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