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         help
 130           Before relocation, memory is very limited on many platforms. Still,
 131           we can provide a small malloc() pool if needed. Driver model in
 132           particular needs this to operate, so that it can allocate the
 133           initial serial device and any others that are needed.
 134
 135 config SYS_MALLOC_F_LEN
 136         hex "Size of malloc() pool before relocation"
 137         depends on SYS_MALLOC_F
 138         default 0x1000 if AM33XX
 139         default 0x400
 140         help
 141           Before relocation, memory is very limited on many platforms. Still,
 142           we can provide a small malloc() pool if needed. Driver model in
 143           particular needs this to operate, so that it can allocate the
 144           initial serial device and any others that are needed.
 145
 146 config SYS_MALLOC_LEN
 147         hex "Define memory for Dynamic allocation"
 148         depends on ARCH_ZYNQ || ARCH_VERSAL
 149         help
 150           This defines memory to be allocated for Dynamic allocation
 151           TODO: Use for other architectures
 152
 153 config SPL_SYS_MALLOC_F_LEN
 154         hex "Size of malloc() pool in SPL before relocation"
 155         depends on SYS_MALLOC_F
 156         default SYS_MALLOC_F_LEN
 157         help
 158           Before relocation, memory is very limited on many platforms. Still,
 159           we can provide a small malloc() pool if needed. Driver model in
 160           particular needs this to operate, so that it can allocate the
 161           initial serial device and any others that are needed.
 162
 163 config TPL_SYS_MALLOC_F_LEN
 164         hex "Size of malloc() pool in TPL before relocation"
 165         depends on SYS_MALLOC_F
 166         default SYS_MALLOC_F_LEN
 167         help
 168           Before relocation, memory is very limited on many platforms. Still,
 169           we can provide a small malloc() pool if needed. Driver model in
 170           particular needs this to operate, so that it can allocate the
 171           initial serial device and any others that are needed.
 172
 173 menuconfig EXPERT
 174         bool "Configure standard U-Boot features (expert users)"
 175         default y
 176         help
 177           This option allows certain base U-Boot options and settings
 178           to be disabled or tweaked. This is for specialized
 179           environments which can tolerate a "non-standard" U-Boot.
 180           Use this only if you really know what you are doing.
 181
 182 if EXPERT
 183         config SYS_MALLOC_CLEAR_ON_INIT
 184         bool "Init with zeros the memory reserved for malloc (slow)"
 185         default y
 186         help
 187           This setting is enabled by default. The reserved malloc
 188           memory is initialized with zeros, so first malloc calls
 189           will return the pointer to the zeroed memory. But this
 190           slows the boot time.
 191
 192           It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
 193           value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
 194           Then the boot time can be significantly reduced.
 195           Warning:
 196           When disabling this, please check if malloc calls, maybe
 197           should be replaced by calloc - if one expects zeroed memory.
 198
 199 config TOOLS_DEBUG
 200         bool "Enable debug information for tools"
 201         help
 202           Enable generation of debug information for tools such as mkimage.
 203           This can be used for debugging purposes. With debug information
 204           it is possible to set breakpoints on particular lines, single-step
 205           debug through the source code, etc.
 206
 207 endif # EXPERT
 208
 209 config PHYS_64BIT
 210         bool "64bit physical address support"
 211         help
 212           Say Y here to support 64bit physical memory address.
 213           This can be used not only for 64bit SoCs, but also for
 214           large physical address extention on 32bit SoCs.
 215
 216 config BUILD_ROM
 217         bool "Build U-Boot as BIOS replacement"
 218         depends on X86
 219         help
 220           This option allows to build a ROM version of U-Boot.
 221           The build process generally requires several binary blobs
 222           which are not shipped in the U-Boot source tree.
 223           Please, see doc/README.x86 for details.
 224
 225 endmenu         # General setup
 226
 227 menu "Boot images"
 228
 229 config ANDROID_BOOT_IMAGE
 230         bool "Enable support for Android Boot Images"
 231         default y if FASTBOOT
 232         help
 233           This enables support for booting images which use the Android
 234           image format header.
 235
 236 config FIT
 237         bool "Support Flattened Image Tree"
 238         select MD5
 239         select SHA1
 240         help
 241           This option allows you to boot the new uImage structure,
 242           Flattened Image Tree.  FIT is formally a FDT, which can include
 243           images of various types (kernel, FDT blob, ramdisk, etc.)
 244           in a single blob.  To boot this new uImage structure,
 245           pass the address of the blob to the "bootm" command.
 246           FIT is very flexible, supporting compression, multiple images,
 247           multiple configurations, verification through hashing and also
 248           verified boot (secure boot using RSA).
 249
 250 if FIT
 251
 252 config FIT_ENABLE_SHA256_SUPPORT
 253         bool "Support SHA256 checksum of FIT image contents"
 254         default y
 255         select SHA256
 256         help
 257           Enable this to support SHA256 checksum of FIT image contents. A
 258           SHA256 checksum is a 256-bit (32-byte) hash value used to check that
 259           the image contents have not been corrupted. SHA256 is recommended
 260           for use in secure applications since (as at 2016) there is no known
 261           feasible attack that could produce a 'collision' with differing
 262           input data. Use this for the highest security. Note that only the
 263           SHA256 variant is supported: SHA512 and others are not currently
 264           supported in U-Boot.
 265
 266 config FIT_SIGNATURE
 267         bool "Enable signature verification of FIT uImages"
 268         depends on DM
 269         select HASH
 270         select RSA
 271         help
 272           This option enables signature verification of FIT uImages,
 273           using a hash signed and verified using RSA. If
 274           CONFIG_SHA_PROG_HW_ACCEL is defined, i.e support for progressive
 275           hashing is available using hardware, then the RSA library will use
 276           it. See doc/uImage.FIT/signature.txt for more details.
 277
 278           WARNING: When relying on signed FIT images with a required signature
 279           check the legacy image format is disabled by default, so that
 280           unsigned images cannot be loaded. If a board needs the legacy image
 281           format support in this case, enable it using
 282           CONFIG_IMAGE_FORMAT_LEGACY.
 283
 284 config FIT_SIGNATURE_MAX_SIZE
 285         hex "Max size of signed FIT structures"
 286         depends on FIT_SIGNATURE
 287         default 0x10000000
 288         help
 289           This option sets a max size in bytes for verified FIT uImages.
 290           A sane value of 256MB protects corrupted DTB structures from overlapping
 291           device memory. Assure this size does not extend past expected storage
 292           space.
 293
 294 config FIT_VERBOSE
 295         bool "Show verbose messages when FIT images fail"
 296         help
 297           Generally a system will have valid FIT images so debug messages
 298           are a waste of code space. If you are debugging your images then
 299           you can enable this option to get more verbose information about
 300           failures.
 301
 302 config FIT_BEST_MATCH
 303         bool "Select the best match for the kernel device tree"
 304         help
 305           When no configuration is explicitly selected, default to the
 306           one whose fdt's compatibility field best matches that of
 307           U-Boot itself. A match is considered "best" if it matches the
 308           most specific compatibility entry of U-Boot's fdt's root node.
 309           The order of entries in the configuration's fdt is ignored.
 310
 311 config FIT_IMAGE_POST_PROCESS
 312         bool "Enable post-processing of FIT artifacts after loading by U-Boot"
 313         depends on TI_SECURE_DEVICE
 314         help
 315           Allows doing any sort of manipulation to blobs after they got extracted
 316           from FIT images like stripping off headers or modifying the size of the
 317           blob, verification, authentication, decryption etc. in a platform or
 318           board specific way. In order to use this feature a platform or board-
 319           specific implementation of board_fit_image_post_process() must be
 320           provided. Also, anything done during this post-processing step would
 321           need to be comprehended in how the images were prepared before being
 322           injected into the FIT creation (i.e. the blobs would have been pre-
 323           processed before being added to the FIT image).
 324
 325 if SPL
 326
 327 config SPL_FIT
 328         bool "Support Flattened Image Tree within SPL"
 329         depends on SPL
 330         select SPL_OF_LIBFDT
 331
 332 config SPL_FIT_PRINT
 333         bool "Support FIT printing within SPL"
 334         depends on SPL_FIT
 335         help
 336           Support printing the content of the fitImage in a verbose manner in SPL.
 337
 338 config SPL_FIT_SIGNATURE
 339         bool "Enable signature verification of FIT firmware within SPL"
 340         depends on SPL_DM
 341         select SPL_FIT
 342         select SPL_RSA
 343
 344 config SPL_LOAD_FIT
 345         bool "Enable SPL loading U-Boot as a FIT"
 346         select SPL_FIT
 347         help
 348           Normally with the SPL framework a legacy image is generated as part
 349           of the build. This contains U-Boot along with information as to
 350           where it should be loaded. This option instead enables generation
 351           of a FIT (Flat Image Tree) which provides more flexibility. In
 352           particular it can handle selecting from multiple device tree
 353           and passing the correct one to U-Boot.
 354
 355 config SPL_LOAD_FIT_FULL
 356         bool "Enable SPL loading U-Boot as a FIT"
 357         select SPL_FIT
 358         help
 359           Normally with the SPL framework a legacy image is generated as part
 360           of the build. This contains U-Boot along with information as to
 361           where it should be loaded. This option instead enables generation
 362           of a FIT (Flat Image Tree) which provides more flexibility. In
 363           particular it can handle selecting from multiple device tree
 364           and passing the correct one to U-Boot.
 365
 366 config SPL_FIT_IMAGE_POST_PROCESS
 367         bool "Enable post-processing of FIT artifacts after loading by the SPL"
 368         depends on SPL_LOAD_FIT
 369         help
 370           Allows doing any sort of manipulation to blobs after they got extracted
 371           from the U-Boot FIT image like stripping off headers or modifying the
 372           size of the blob, verification, authentication, decryption etc. in a
 373           platform or board specific way. In order to use this feature a platform
 374           or board-specific implementation of board_fit_image_post_process() must
 375           be provided. Also, anything done during this post-processing step would
 376           need to be comprehended in how the images were prepared before being
 377           injected into the FIT creation (i.e. the blobs would have been pre-
 378           processed before being added to the FIT image).
 379
 380 config SPL_FIT_SOURCE
 381         string ".its source file for U-Boot FIT image"
 382         depends on SPL_FIT
 383         help
 384           Specifies a (platform specific) FIT source file to generate the
 385           U-Boot FIT image. This could specify further image to load and/or
 386           execute.
 387
 388 config SPL_FIT_GENERATOR
 389         string ".its file generator script for U-Boot FIT image"
 390         depends on SPL_FIT
 391         default "board/sunxi/mksunxi_fit_atf.sh" if SPL_LOAD_FIT && ARCH_SUNXI
 392         help
 393           Specifies a (platform specific) script file to generate the FIT
 394           source file used to build the U-Boot FIT image file. This gets
 395           passed a list of supported device tree file stub names to
 396           include in the generated image.
 397
 398 endif # SPL
 399
 400 endif # FIT
 401
 402 config IMAGE_FORMAT_LEGACY
 403         bool "Enable support for the legacy image format"
 404         default y if !FIT_SIGNATURE
 405         help
 406           This option enables the legacy image format. It is enabled by
 407           default for backward compatibility, unless FIT_SIGNATURE is
 408           set where it is disabled so that unsigned images cannot be
 409           loaded. If a board needs the legacy image format support in this
 410           case, enable it here.
 411
 412 config OF_BOARD_SETUP
 413         bool "Set up board-specific details in device tree before boot"
 414         depends on OF_LIBFDT
 415         help
 416           This causes U-Boot to call ft_board_setup() before booting into
 417           the Operating System. This function can set up various
 418           board-specific information in the device tree for use by the OS.
 419           The device tree is then passed to the OS.
 420
 421 config OF_SYSTEM_SETUP
 422         bool "Set up system-specific details in device tree before boot"
 423         depends on OF_LIBFDT
 424         help
 425           This causes U-Boot to call ft_system_setup() before booting into
 426           the Operating System. This function can set up various
 427           system-specific information in the device tree for use by the OS.
 428           The device tree is then passed to the OS.
 429
 430 config OF_STDOUT_VIA_ALIAS
 431         bool "Update the device-tree stdout alias from U-Boot"
 432         depends on OF_LIBFDT
 433         help
 434           This uses U-Boot's serial alias from the aliases node to update
 435           the device tree passed to the OS. The "linux,stdout-path" property
 436           in the chosen node is set to point to the correct serial node.
 437           This option currently references CONFIG_CONS_INDEX, which is
 438           incorrect when used with device tree as this option does not
 439           exist / should not be used.
 440
 441 config SYS_EXTRA_OPTIONS
 442         string "Extra Options (DEPRECATED)"
 443         help
 444           The old configuration infrastructure (= mkconfig + boards.cfg)
 445           provided the extra options field. If you have something like
 446           "HAS_BAR,BAZ=64", the optional options
 447             #define CONFIG_HAS
 448             #define CONFIG_BAZ  64
 449           will be defined in include/config.h.
 450           This option was prepared for the smooth migration from the old
 451           configuration to Kconfig. Since this option will be removed sometime,
 452           new boards should not use this option.
 453
 454 config SYS_TEXT_BASE
 455         depends on !NIOS2 && !XTENSA
 456         depends on !EFI_APP
 457         default 0x80800000 if ARCH_OMAP2PLUS || ARCH_K3
 458         default 0x4a000000 if ARCH_SUNXI && !MACH_SUN9I && !MACH_SUN8I_V3S
 459         default 0x2a000000 if ARCH_SUNXI && MACH_SUN9I
 460         default 0x42e00000 if ARCH_SUNXI && MACH_SUN8I_V3S
 461         hex "Text Base"
 462         help
 463           The address in memory that U-Boot will be running from, initially.
 464
 465
 466
 467 config SYS_CLK_FREQ
 468         depends on ARC || ARCH_SUNXI
 469         int "CPU clock frequency"
 470         help
 471           TODO: Move CONFIG_SYS_CLK_FREQ for all the architecture
 472
 473 config ARCH_FIXUP_FDT_MEMORY
 474         bool "Enable arch_fixup_memory_banks() call"
 475         default y
 476         help
 477           Enable FDT memory map syncup before OS boot. This feature can be
 478           used for booting OS with different memory setup where the part of
 479           the memory location should be used for different purpose.
 480
 481 endmenu         # Boot images
 482
 483 source "api/Kconfig"
 484
 485 source "common/Kconfig"
 486
 487 source "cmd/Kconfig"
 488
 489 source "disk/Kconfig"
 490
 491 source "dts/Kconfig"
 492
 493 source "env/Kconfig"
 494
 495 source "net/Kconfig"
 496
 497 source "drivers/Kconfig"
 498
 499 source "fs/Kconfig"
 500
 501 source "lib/Kconfig"
 502
 503 source "test/Kconfig"