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 DISTRO_DEFAULTS
  63         bool "Select defaults suitable for booting general purpose Linux distributions"
  64         default y if ARCH_SUNXI || TEGRA
  65         default y if ARCH_LS2080A
  66         default y if ARCH_MESON
  67         default y if ARCH_ROCKCHIP
  68         default n
  69         select CMD_BOOTZ if ARM && !ARM64
  70         select CMD_BOOTI if ARM64
  71         select CMD_DHCP
  72         select CMD_PXE
  73         select CMD_EXT2
  74         select CMD_EXT4
  75         select CMD_FAT
  76         select CMD_FS_GENERIC
  77         select CMD_MII
  78         select CMD_PING
  79         select CMD_PART
  80         select HUSH_PARSER
  81         help
  82           Select this to enable various options and commands which are suitable
  83           for building u-boot for booting general purpose Linux distributions.
  84
  85 config SYS_MALLOC_F
  86         bool "Enable malloc() pool before relocation"
  87         default y if DM
  88         help
  89           Before relocation, memory is very limited on many platforms. Still,
  90           we can provide a small malloc() pool if needed. Driver model in
  91           particular needs this to operate, so that it can allocate the
  92           initial serial device and any others that are needed.
  93
  94 config SYS_MALLOC_F_LEN
  95         hex "Size of malloc() pool before relocation"
  96         depends on SYS_MALLOC_F
  97         default 0x400
  98         help
  99           Before relocation, memory is very limited on many platforms. Still,
 100           we can provide a small malloc() pool if needed. Driver model in
 101           particular needs this to operate, so that it can allocate the
 102           initial serial device and any others that are needed.
 103
 104 config SPL_SYS_MALLOC_F_LEN
 105         hex "Size of malloc() pool in SPL before relocation"
 106         depends on SYS_MALLOC_F
 107         default SYS_MALLOC_F_LEN
 108         help
 109           Before relocation, memory is very limited on many platforms. Still,
 110           we can provide a small malloc() pool if needed. Driver model in
 111           particular needs this to operate, so that it can allocate the
 112           initial serial device and any others that are needed.
 113
 114 config TPL_SYS_MALLOC_F_LEN
 115         hex "Size of malloc() pool in TPL before relocation"
 116         depends on SYS_MALLOC_F
 117         default SYS_MALLOC_F_LEN
 118         help
 119           Before relocation, memory is very limited on many platforms. Still,
 120           we can provide a small malloc() pool if needed. Driver model in
 121           particular needs this to operate, so that it can allocate the
 122           initial serial device and any others that are needed.
 123
 124 menuconfig EXPERT
 125         bool "Configure standard U-Boot features (expert users)"
 126         default y
 127         help
 128           This option allows certain base U-Boot options and settings
 129           to be disabled or tweaked. This is for specialized
 130           environments which can tolerate a "non-standard" U-Boot.
 131           Use this only if you really know what you are doing.
 132
 133 if EXPERT
 134         config SYS_MALLOC_CLEAR_ON_INIT
 135         bool "Init with zeros the memory reserved for malloc (slow)"
 136         default y
 137         help
 138           This setting is enabled by default. The reserved malloc
 139           memory is initialized with zeros, so first malloc calls
 140           will return the pointer to the zeroed memory. But this
 141           slows the boot time.
 142
 143           It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
 144           value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
 145           Then the boot time can be significantly reduced.
 146           Warning:
 147           When disabling this, please check if malloc calls, maybe
 148           should be replaced by calloc - if one expects zeroed memory.
 149
 150 config TOOLS_DEBUG
 151         bool "Enable debug information for tools"
 152         help
 153           Enable generation of debug information for tools such as mkimage.
 154           This can be used for debugging purposes. With debug information
 155           it is possible to set breakpoints on particular lines, single-step
 156           debug through the source code, etc.
 157
 158 endif # EXPERT
 159
 160 config PHYS_64BIT
 161         bool "64bit physical address support"
 162         help
 163           Say Y here to support 64bit physical memory address.
 164           This can be used not only for 64bit SoCs, but also for
 165           large physical address extention on 32bit SoCs.
 166
 167 config BUILD_ROM
 168         bool "Build U-Boot as BIOS replacement"
 169         depends on X86
 170         help
 171           This option allows to build a ROM version of U-Boot.
 172           The build process generally requires several binary blobs
 173           which are not shipped in the U-Boot source tree.
 174           Please, see doc/README.x86 for details.
 175
 176 endmenu         # General setup
 177
 178 menu "Boot images"
 179
 180 config ANDROID_BOOT_IMAGE
 181         bool "Enable support for Android Boot Images"
 182         default y if FASTBOOT
 183         help
 184           This enables support for booting images which use the Android
 185           image format header.
 186
 187 config FIT
 188         bool "Support Flattened Image Tree"
 189         select MD5
 190         select SHA1
 191         help
 192           This option allows you to boot the new uImage structure,
 193           Flattened Image Tree.  FIT is formally a FDT, which can include
 194           images of various types (kernel, FDT blob, ramdisk, etc.)
 195           in a single blob.  To boot this new uImage structure,
 196           pass the address of the blob to the "bootm" command.
 197           FIT is very flexible, supporting compression, multiple images,
 198           multiple configurations, verification through hashing and also
 199           verified boot (secure boot using RSA).
 200
 201 if FIT
 202
 203 config FIT_ENABLE_SHA256_SUPPORT
 204         bool "Support SHA256 checksum of FIT image contents"
 205         select SHA256
 206         default y
 207         help
 208           Enable this to support SHA256 checksum of FIT image contents. A
 209           SHA256 checksum is a 256-bit (32-byte) hash value used to check that
 210           the image contents have not been corrupted. SHA256 is recommended
 211           for use in secure applications since (as at 2016) there is no known
 212           feasible attack that could produce a 'collision' with differing
 213           input data. Use this for the highest security. Note that only the
 214           SHA256 variant is supported: SHA512 and others are not currently
 215           supported in U-Boot.
 216
 217 config FIT_SIGNATURE
 218         bool "Enable signature verification of FIT uImages"
 219         depends on DM
 220         select RSA
 221         help
 222           This option enables signature verification of FIT uImages,
 223           using a hash signed and verified using RSA. If
 224           CONFIG_SHA_PROG_HW_ACCEL is defined, i.e support for progressive
 225           hashing is available using hardware, then the RSA library will use
 226           it. See doc/uImage.FIT/signature.txt for more details.
 227
 228           WARNING: When relying on signed FIT images with a required signature
 229           check the legacy image format is disabled by default, so that
 230           unsigned images cannot be loaded. If a board needs the legacy image
 231           format support in this case, enable it using
 232           CONFIG_IMAGE_FORMAT_LEGACY.
 233
 234 config FIT_VERBOSE
 235         bool "Show verbose messages when FIT images fail"
 236         help
 237           Generally a system will have valid FIT images so debug messages
 238           are a waste of code space. If you are debugging your images then
 239           you can enable this option to get more verbose information about
 240           failures.
 241
 242 config FIT_BEST_MATCH
 243         bool "Select the best match for the kernel device tree"
 244         help
 245           When no configuration is explicitly selected, default to the
 246           one whose fdt's compatibility field best matches that of
 247           U-Boot itself. A match is considered "best" if it matches the
 248           most specific compatibility entry of U-Boot's fdt's root node.
 249           The order of entries in the configuration's fdt is ignored.
 250
 251 config FIT_IMAGE_POST_PROCESS
 252         bool "Enable post-processing of FIT artifacts after loading by U-Boot"
 253         depends on TI_SECURE_DEVICE
 254         help
 255           Allows doing any sort of manipulation to blobs after they got extracted
 256           from FIT images like stripping off headers or modifying the size of the
 257           blob, verification, authentication, decryption etc. in a platform or
 258           board specific way. In order to use this feature a platform or board-
 259           specific implementation of board_fit_image_post_process() must be
 260           provided. Also, anything done during this post-processing step would
 261           need to be comprehended in how the images were prepared before being
 262           injected into the FIT creation (i.e. the blobs would have been pre-
 263           processed before being added to the FIT image).
 264
 265 if SPL
 266
 267 config SPL_FIT
 268         bool "Support Flattened Image Tree within SPL"
 269         depends on SPL
 270         select SPL_OF_LIBFDT
 271
 272 config SPL_FIT_SIGNATURE
 273         bool "Enable signature verification of FIT firmware within SPL"
 274         depends on SPL_DM
 275         select SPL_FIT
 276         select SPL_RSA
 277
 278 config SPL_LOAD_FIT
 279         bool "Enable SPL loading U-Boot as a FIT"
 280         select SPL_FIT
 281         help
 282           Normally with the SPL framework a legacy image is generated as part
 283           of the build. This contains U-Boot along with information as to
 284           where it should be loaded. This option instead enables generation
 285           of a FIT (Flat Image Tree) which provides more flexibility. In
 286           particular it can handle selecting from multiple device tree
 287           and passing the correct one to U-Boot.
 288
 289 config SPL_FIT_IMAGE_POST_PROCESS
 290         bool "Enable post-processing of FIT artifacts after loading by the SPL"
 291         depends on SPL_LOAD_FIT
 292         help
 293           Allows doing any sort of manipulation to blobs after they got extracted
 294           from the U-Boot FIT image like stripping off headers or modifying the
 295           size of the blob, verification, authentication, decryption etc. in a
 296           platform or board specific way. In order to use this feature a platform
 297           or board-specific implementation of board_fit_image_post_process() must
 298           be provided. Also, anything done during this post-processing step would
 299           need to be comprehended in how the images were prepared before being
 300           injected into the FIT creation (i.e. the blobs would have been pre-
 301           processed before being added to the FIT image).
 302
 303 config SPL_FIT_SOURCE
 304         string ".its source file for U-Boot FIT image"
 305         depends on SPL_FIT
 306         help
 307           Specifies a (platform specific) FIT source file to generate the
 308           U-Boot FIT image. This could specify further image to load and/or
 309           execute.
 310
 311 config SPL_FIT_GENERATOR
 312         string ".its file generator script for U-Boot FIT image"
 313         depends on SPL_FIT
 314         default "board/sunxi/mksunxi_fit_atf.sh" if SPL_LOAD_FIT && ARCH_SUNXI
 315         help
 316           Specifies a (platform specific) script file to generate the FIT
 317           source file used to build the U-Boot FIT image file. This gets
 318           passed a list of supported device tree file stub names to
 319           include in the generated image.
 320
 321 endif # SPL
 322
 323 endif # FIT
 324
 325 config OF_BOARD_SETUP
 326         bool "Set up board-specific details in device tree before boot"
 327         depends on OF_LIBFDT
 328         help
 329           This causes U-Boot to call ft_board_setup() before booting into
 330           the Operating System. This function can set up various
 331           board-specific information in the device tree for use by the OS.
 332           The device tree is then passed to the OS.
 333
 334 config OF_SYSTEM_SETUP
 335         bool "Set up system-specific details in device tree before boot"
 336         depends on OF_LIBFDT
 337         help
 338           This causes U-Boot to call ft_system_setup() before booting into
 339           the Operating System. This function can set up various
 340           system-specific information in the device tree for use by the OS.
 341           The device tree is then passed to the OS.
 342
 343 config OF_STDOUT_VIA_ALIAS
 344         bool "Update the device-tree stdout alias from U-Boot"
 345         depends on OF_LIBFDT
 346         help
 347           This uses U-Boot's serial alias from the aliases node to update
 348           the device tree passed to the OS. The "linux,stdout-path" property
 349           in the chosen node is set to point to the correct serial node.
 350           This option currently references CONFIG_CONS_INDEX, which is
 351           incorrect when used with device tree as this option does not
 352           exist / should not be used.
 353
 354 config SYS_EXTRA_OPTIONS
 355         string "Extra Options (DEPRECATED)"
 356         help
 357           The old configuration infrastructure (= mkconfig + boards.cfg)
 358           provided the extra options field. If you have something like
 359           "HAS_BAR,BAZ=64", the optional options
 360             #define CONFIG_HAS
 361             #define CONFIG_BAZ  64
 362           will be defined in include/config.h.
 363           This option was prepared for the smooth migration from the old
 364           configuration to Kconfig. Since this option will be removed sometime,
 365           new boards should not use this option.
 366
 367 config SYS_TEXT_BASE
 368         depends on ARC || X86 || ARCH_UNIPHIER || ARCH_ZYNQMP || \
 369                 (M68K && !TARGET_ASTRO_MCF5373L) || MICROBLAZE || MIPS || \
 370                 ARCH_ZYNQ || ARCH_KEYSTONE || ARCH_OMAP2PLUS
 371         depends on !EFI_APP
 372         hex "Text Base"
 373         help
 374           TODO: Move CONFIG_SYS_TEXT_BASE for all the architecture
 375
 376         default 0x80800000 if ARCH_OMAP2PLUS
 377
 378
 379 config SYS_CLK_FREQ
 380         depends on ARC || ARCH_SUNXI
 381         int "CPU clock frequency"
 382         help
 383           TODO: Move CONFIG_SYS_CLK_FREQ for all the architecture
 384
 385 config ARCH_FIXUP_FDT_MEMORY
 386         bool "Enable arch_fixup_memory_banks() call"
 387         default y
 388         help
 389           Enable FDT memory map syncup before OS boot. This feature can be
 390           used for booting OS with different memory setup where the part of
 391           the memory location should be used for different purpose.
 392
 393 endmenu         # Boot images
 394
 395 source "api/Kconfig"
 396
 397 source "common/Kconfig"
 398
 399 source "cmd/Kconfig"
 400
 401 source "disk/Kconfig"
 402
 403 source "dts/Kconfig"
 404
 405 source "env/Kconfig"
 406
 407 source "net/Kconfig"
 408
 409 source "drivers/Kconfig"
 410
 411 source "fs/Kconfig"
 412
 413 source "lib/Kconfig"
 414
 415 source "test/Kconfig"