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_ENABLE_SHA256_SUPPORT
 255         bool "Support SHA256 checksum of FIT image contents"
 256         default y
 257         select SHA256
 258         help
 259           Enable this to support SHA256 checksum of FIT image contents. A
 260           SHA256 checksum is a 256-bit (32-byte) hash value used to check that
 261           the image contents have not been corrupted. SHA256 is recommended
 262           for use in secure applications since (as at 2016) there is no known
 263           feasible attack that could produce a 'collision' with differing
 264           input data. Use this for the highest security. Note that only the
 265           SHA256 variant is supported: SHA512 and others are not currently
 266           supported in U-Boot.
 267
 268 config FIT_SIGNATURE
 269         bool "Enable signature verification of FIT uImages"
 270         depends on DM
 271         select HASH
 272         select RSA
 273         help
 274           This option enables signature verification of FIT uImages,
 275           using a hash signed and verified using RSA. If
 276           CONFIG_SHA_PROG_HW_ACCEL is defined, i.e support for progressive
 277           hashing is available using hardware, then the RSA library will use
 278           it. See doc/uImage.FIT/signature.txt for more details.
 279
 280           WARNING: When relying on signed FIT images with a required signature
 281           check the legacy image format is disabled by default, so that
 282           unsigned images cannot be loaded. If a board needs the legacy image
 283           format support in this case, enable it using
 284           CONFIG_IMAGE_FORMAT_LEGACY.
 285
 286 config FIT_SIGNATURE_MAX_SIZE
 287         hex "Max size of signed FIT structures"
 288         depends on FIT_SIGNATURE
 289         default 0x10000000
 290         help
 291           This option sets a max size in bytes for verified FIT uImages.
 292           A sane value of 256MB protects corrupted DTB structures from overlapping
 293           device memory. Assure this size does not extend past expected storage
 294           space.
 295
 296 config FIT_ENABLE_RSASSA_PSS_SUPPORT
 297         bool "Support rsassa-pss signature scheme of FIT image contents"
 298         depends on FIT_SIGNATURE
 299         default n
 300         help
 301           Enable this to support the pss padding algorithm as described
 302           in the rfc8017 (https://tools.ietf.org/html/rfc8017).
 303
 304 config FIT_VERBOSE
 305         bool "Show verbose messages when FIT images fail"
 306         help
 307           Generally a system will have valid FIT images so debug messages
 308           are a waste of code space. If you are debugging your images then
 309           you can enable this option to get more verbose information about
 310           failures.
 311
 312 config FIT_BEST_MATCH
 313         bool "Select the best match for the kernel device tree"
 314         help
 315           When no configuration is explicitly selected, default to the
 316           one whose fdt's compatibility field best matches that of
 317           U-Boot itself. A match is considered "best" if it matches the
 318           most specific compatibility entry of U-Boot's fdt's root node.
 319           The order of entries in the configuration's fdt is ignored.
 320
 321 config FIT_IMAGE_POST_PROCESS
 322         bool "Enable post-processing of FIT artifacts after loading by U-Boot"
 323         depends on TI_SECURE_DEVICE
 324         help
 325           Allows doing any sort of manipulation to blobs after they got extracted
 326           from FIT images like stripping off headers or modifying the size of the
 327           blob, verification, authentication, decryption etc. in a platform or
 328           board specific way. In order to use this feature a platform or board-
 329           specific implementation of board_fit_image_post_process() must be
 330           provided. Also, anything done during this post-processing step would
 331           need to be comprehended in how the images were prepared before being
 332           injected into the FIT creation (i.e. the blobs would have been pre-
 333           processed before being added to the FIT image).
 334
 335 if SPL
 336
 337 config SPL_FIT
 338         bool "Support Flattened Image Tree within SPL"
 339         depends on SPL
 340         select SPL_OF_LIBFDT
 341
 342 config SPL_FIT_PRINT
 343         bool "Support FIT printing within SPL"
 344         depends on SPL_FIT
 345         help
 346           Support printing the content of the fitImage in a verbose manner in SPL.
 347
 348 config SPL_FIT_SIGNATURE
 349         bool "Enable signature verification of FIT firmware within SPL"
 350         depends on SPL_DM
 351         select SPL_FIT
 352         select SPL_RSA
 353
 354 config SPL_LOAD_FIT
 355         bool "Enable SPL loading U-Boot as a FIT"
 356         select SPL_FIT
 357         help
 358           Normally with the SPL framework a legacy image is generated as part
 359           of the build. This contains U-Boot along with information as to
 360           where it should be loaded. This option instead enables generation
 361           of a FIT (Flat Image Tree) which provides more flexibility. In
 362           particular it can handle selecting from multiple device tree
 363           and passing the correct one to U-Boot.
 364
 365 config SPL_LOAD_FIT_FULL
 366         bool "Enable SPL loading U-Boot as a FIT"
 367         select SPL_FIT
 368         help
 369           Normally with the SPL framework a legacy image is generated as part
 370           of the build. This contains U-Boot along with information as to
 371           where it should be loaded. This option instead enables generation
 372           of a FIT (Flat Image Tree) which provides more flexibility. In
 373           particular it can handle selecting from multiple device tree
 374           and passing the correct one to U-Boot.
 375
 376 config SPL_FIT_IMAGE_POST_PROCESS
 377         bool "Enable post-processing of FIT artifacts after loading by the SPL"
 378         depends on SPL_LOAD_FIT
 379         help
 380           Allows doing any sort of manipulation to blobs after they got extracted
 381           from the U-Boot FIT image like stripping off headers or modifying the
 382           size of the blob, verification, authentication, decryption etc. in a
 383           platform or board specific way. In order to use this feature a platform
 384           or board-specific implementation of board_fit_image_post_process() must
 385           be provided. Also, anything done during this post-processing step would
 386           need to be comprehended in how the images were prepared before being
 387           injected into the FIT creation (i.e. the blobs would have been pre-
 388           processed before being added to the FIT image).
 389
 390 config SPL_FIT_SOURCE
 391         string ".its source file for U-Boot FIT image"
 392         depends on SPL_FIT
 393         help
 394           Specifies a (platform specific) FIT source file to generate the
 395           U-Boot FIT image. This could specify further image to load and/or
 396           execute.
 397
 398 config SPL_FIT_GENERATOR
 399         string ".its file generator script for U-Boot FIT image"
 400         depends on SPL_FIT
 401         default "board/sunxi/mksunxi_fit_atf.sh" if SPL_LOAD_FIT && ARCH_SUNXI
 402         help
 403           Specifies a (platform specific) script file to generate the FIT
 404           source file used to build the U-Boot FIT image file. This gets
 405           passed a list of supported device tree file stub names to
 406           include in the generated image.
 407
 408 endif # SPL
 409
 410 endif # FIT
 411
 412 config IMAGE_FORMAT_LEGACY
 413         bool "Enable support for the legacy image format"
 414         default y if !FIT_SIGNATURE
 415         help
 416           This option enables the legacy image format. It is enabled by
 417           default for backward compatibility, unless FIT_SIGNATURE is
 418           set where it is disabled so that unsigned images cannot be
 419           loaded. If a board needs the legacy image format support in this
 420           case, enable it here.
 421
 422 config OF_BOARD_SETUP
 423         bool "Set up board-specific details in device tree before boot"
 424         depends on OF_LIBFDT
 425         help
 426           This causes U-Boot to call ft_board_setup() before booting into
 427           the Operating System. This function can set up various
 428           board-specific information in the device tree for use by the OS.
 429           The device tree is then passed to the OS.
 430
 431 config OF_SYSTEM_SETUP
 432         bool "Set up system-specific details in device tree before boot"
 433         depends on OF_LIBFDT
 434         help
 435           This causes U-Boot to call ft_system_setup() before booting into
 436           the Operating System. This function can set up various
 437           system-specific information in the device tree for use by the OS.
 438           The device tree is then passed to the OS.
 439
 440 config OF_STDOUT_VIA_ALIAS
 441         bool "Update the device-tree stdout alias from U-Boot"
 442         depends on OF_LIBFDT
 443         help
 444           This uses U-Boot's serial alias from the aliases node to update
 445           the device tree passed to the OS. The "linux,stdout-path" property
 446           in the chosen node is set to point to the correct serial node.
 447           This option currently references CONFIG_CONS_INDEX, which is
 448           incorrect when used with device tree as this option does not
 449           exist / should not be used.
 450
 451 config SYS_EXTRA_OPTIONS
 452         string "Extra Options (DEPRECATED)"
 453         help
 454           The old configuration infrastructure (= mkconfig + boards.cfg)
 455           provided the extra options field. If you have something like
 456           "HAS_BAR,BAZ=64", the optional options
 457             #define CONFIG_HAS
 458             #define CONFIG_BAZ  64
 459           will be defined in include/config.h.
 460           This option was prepared for the smooth migration from the old
 461           configuration to Kconfig. Since this option will be removed sometime,
 462           new boards should not use this option.
 463
 464 config SYS_TEXT_BASE
 465         depends on !NIOS2 && !XTENSA
 466         depends on !EFI_APP
 467         default 0x80800000 if ARCH_OMAP2PLUS || ARCH_K3
 468         default 0x4a000000 if ARCH_SUNXI && !MACH_SUN9I && !MACH_SUN8I_V3S
 469         default 0x2a000000 if ARCH_SUNXI && MACH_SUN9I
 470         default 0x42e00000 if ARCH_SUNXI && MACH_SUN8I_V3S
 471         hex "Text Base"
 472         help
 473           The address in memory that U-Boot will be running from, initially.
 474
 475
 476
 477 config SYS_CLK_FREQ
 478         depends on ARC || ARCH_SUNXI
 479         int "CPU clock frequency"
 480         help
 481           TODO: Move CONFIG_SYS_CLK_FREQ for all the architecture
 482
 483 config ARCH_FIXUP_FDT_MEMORY
 484         bool "Enable arch_fixup_memory_banks() call"
 485         default y
 486         help
 487           Enable FDT memory map syncup before OS boot. This feature can be
 488           used for booting OS with different memory setup where the part of
 489           the memory location should be used for different purpose.
 490
 491 endmenu         # Boot images
 492
 493 source "api/Kconfig"
 494
 495 source "common/Kconfig"
 496
 497 source "cmd/Kconfig"
 498
 499 source "disk/Kconfig"
 500
 501 source "dts/Kconfig"
 502
 503 source "env/Kconfig"
 504
 505 source "net/Kconfig"
 506
 507 source "drivers/Kconfig"
 508
 509 source "fs/Kconfig"
 510
 511 source "lib/Kconfig"
 512
 513 source "test/Kconfig"