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 LOCALVERSION
  18         string "Local version - append to U-Boot release"
  19         help
  20           Append an extra string to the end of your U-Boot version.
  21           This will show up in your boot log, for example.
  22           The string you set here will be appended after the contents of
  23           any files with a filename matching localversion* in your
  24           object and source tree, in that order.  Your total string can
  25           be a maximum of 64 characters.
  26
  27 config LOCALVERSION_AUTO
  28         bool "Automatically append version information to the version string"
  29         default y
  30         help
  31           This will try to automatically determine if the current tree is a
  32           release tree by looking for Git tags that belong to the current
  33           top of tree revision.
  34
  35           A string of the format -gxxxxxxxx will be added to the localversion
  36           if a Git-based tree is found.  The string generated by this will be
  37           appended after any matching localversion* files, and after the value
  38           set in CONFIG_LOCALVERSION.
  39
  40           (The actual string used here is the first eight characters produced
  41           by running the command:
  42
  43             $ git rev-parse --verify HEAD
  44
  45           which is done within the script "scripts/setlocalversion".)
  46
  47 config CC_OPTIMIZE_FOR_SIZE
  48         bool "Optimize for size"
  49         default y
  50         help
  51           Enabling this option will pass "-Os" instead of "-O2" to gcc
  52           resulting in a smaller U-Boot image.
  53
  54           This option is enabled by default for U-Boot.
  55
  56 config DISTRO_DEFAULTS
  57         bool "Select defaults suitable for booting general purpose Linux distributions"
  58         default y if ARCH_SUNXI
  59         default y if ARCH_LS2080A
  60         default n
  61         select CMD_BOOTZ if ARM && !ARM64
  62         select CMD_BOOTI if ARM64
  63         select CMD_DHCP
  64         select CMD_EXT2
  65         select CMD_EXT4
  66         select CMD_FAT
  67         select CMD_FS_GENERIC
  68         select CMD_MII
  69         select CMD_PING
  70         select HUSH_PARSER
  71         help
  72           Select this to enable various options and commands which are suitable
  73           for building u-boot for booting general purpose Linux distributions.
  74
  75 config SYS_MALLOC_F
  76         bool "Enable malloc() pool before relocation"
  77         default y if DM
  78         help
  79           Before relocation, memory is very limited on many platforms. Still,
  80           we can provide a small malloc() pool if needed. Driver model in
  81           particular needs this to operate, so that it can allocate the
  82           initial serial device and any others that are needed.
  83
  84 config SYS_MALLOC_F_LEN
  85         hex "Size of malloc() pool before relocation"
  86         depends on SYS_MALLOC_F
  87         default 0x400
  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 menuconfig EXPERT
  95         bool "Configure standard U-Boot features (expert users)"
  96         default y
  97         help
  98           This option allows certain base U-Boot options and settings
  99           to be disabled or tweaked. This is for specialized
 100           environments which can tolerate a "non-standard" U-Boot.
 101           Use this only if you really know what you are doing.
 102
 103 if EXPERT
 104         config SYS_MALLOC_CLEAR_ON_INIT
 105         bool "Init with zeros the memory reserved for malloc (slow)"
 106         default y
 107         help
 108           This setting is enabled by default. The reserved malloc
 109           memory is initialized with zeros, so first malloc calls
 110           will return the pointer to the zeroed memory. But this
 111           slows the boot time.
 112
 113           It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
 114           value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
 115           Then the boot time can be significantly reduced.
 116           Warning:
 117           When disabling this, please check if malloc calls, maybe
 118           should be replaced by calloc - if one expects zeroed memory.
 119
 120 config TOOLS_DEBUG
 121         bool "Enable debug information for tools"
 122         help
 123           Enable generation of debug information for tools such as mkimage.
 124           This can be used for debugging purposes. With debug information
 125           it is possible to set breakpoints on particular lines, single-step
 126           debug through the source code, etc.
 127
 128 endif
 129
 130 config PHYS_64BIT
 131         bool "64bit physical address support"
 132         help
 133           Say Y here to support 64bit physical memory address.
 134           This can be used not only for 64bit SoCs, but also for
 135           large physical address extention on 32bit SoCs.
 136
 137 endmenu         # General setup
 138
 139 menu "Boot images"
 140
 141 config FIT
 142         bool "Support Flattened Image Tree"
 143         help
 144           This option allows to boot the new uImage structrure,
 145           Flattened Image Tree.  FIT is formally a FDT, which can include
 146           images of various types (kernel, FDT blob, ramdisk, etc.)
 147           in a single blob.  To boot this new uImage structure,
 148           pass the address of the blob to the "bootm" command.
 149           FIT is very flexible, supporting compression, multiple images,
 150           multiple configurations, verification through hashing and also
 151           verified boot (secure boot using RSA). This option enables that
 152           feature.
 153
 154 config SPL_FIT
 155         bool "Support Flattened Image Tree within SPL"
 156         depends on FIT
 157         depends on SPL
 158
 159 config FIT_VERBOSE
 160         bool "Display verbose messages on FIT boot"
 161         depends on FIT
 162
 163 config FIT_SIGNATURE
 164         bool "Enable signature verification of FIT uImages"
 165         depends on FIT
 166         depends on DM
 167         select RSA
 168         help
 169           This option enables signature verification of FIT uImages,
 170           using a hash signed and verified using RSA. If
 171           CONFIG_SHA_PROG_HW_ACCEL is defined, i.e support for progressive
 172           hashing is available using hardware, then then RSA library will use
 173           it. See doc/uImage.FIT/signature.txt for more details.
 174
 175           WARNING: When relying on signed FIT images with a required signature
 176           check the legacy image format is disabled by default, so that
 177           unsigned images cannot be loaded. If a board needs the legacy image
 178           format support in this case, enable it using
 179           CONFIG_IMAGE_FORMAT_LEGACY.
 180
 181 config SPL_FIT_SIGNATURE
 182         bool "Enable signature verification of FIT firmware within SPL"
 183         depends on SPL_FIT
 184         depends on SPL_DM
 185         select SPL_RSA
 186
 187 config FIT_BEST_MATCH
 188         bool "Select the best match for the kernel device tree"
 189         depends on FIT
 190         help
 191           When no configuration is explicitly selected, default to the
 192           one whose fdt's compatibility field best matches that of
 193           U-Boot itself. A match is considered "best" if it matches the
 194           most specific compatibility entry of U-Boot's fdt's root node.
 195           The order of entries in the configuration's fdt is ignored.
 196
 197 config FIT_VERBOSE
 198         bool "Show verbose messages when FIT images fails"
 199         depends on FIT
 200         help
 201           Generally a system will have valid FIT images so debug messages
 202           are a waste of code space. If you are debugging your images then
 203           you can enable this option to get more verbose information about
 204           failures.
 205
 206 config OF_BOARD_SETUP
 207         bool "Set up board-specific details in device tree before boot"
 208         depends on OF_LIBFDT
 209         help
 210           This causes U-Boot to call ft_board_setup() before booting into
 211           the Operating System. This function can set up various
 212           board-specific information in the device tree for use by the OS.
 213           The device tree is then passed to the OS.
 214
 215 config OF_SYSTEM_SETUP
 216         bool "Set up system-specific details in device tree before boot"
 217         depends on OF_LIBFDT
 218         help
 219           This causes U-Boot to call ft_system_setup() before booting into
 220           the Operating System. This function can set up various
 221           system-specific information in the device tree for use by the OS.
 222           The device tree is then passed to the OS.
 223
 224 config OF_STDOUT_VIA_ALIAS
 225         bool "Update the device-tree stdout alias from U-Boot"
 226         depends on OF_LIBFDT
 227         help
 228           This uses U-Boot's serial alias from the aliases node to update
 229           the device tree passed to the OS. The "linux,stdout-path" property
 230           in the chosen node is set to point to the correct serial node.
 231           This option currently references CONFIG_CONS_INDEX, which is
 232           incorrect when used with device tree as this option does not
 233           exist / should not be used.
 234
 235 config SYS_EXTRA_OPTIONS
 236         string "Extra Options (DEPRECATED)"
 237         help
 238           The old configuration infrastructure (= mkconfig + boards.cfg)
 239           provided the extra options field. If you have something like
 240           "HAS_BAR,BAZ=64", the optional options
 241             #define CONFIG_HAS
 242             #define CONFIG_BAZ  64
 243           will be defined in include/config.h.
 244           This option was prepared for the smooth migration from the old
 245           configuration to Kconfig. Since this option will be removed sometime,
 246           new boards should not use this option.
 247
 248 config SYS_TEXT_BASE
 249         depends on SPARC || ARC || X86 || ARCH_UNIPHIER || ARCH_ZYNQMP || \
 250                 (M68K && !TARGET_ASTRO_MCF5373L) || MICROBLAZE || MIPS
 251         depends on !EFI_APP
 252         hex "Text Base"
 253         help
 254           TODO: Move CONFIG_SYS_TEXT_BASE for all the architecture
 255
 256 config SPL_LOAD_FIT
 257         bool "Enable SPL loading U-Boot as a FIT"
 258         depends on FIT
 259         help
 260           Normally with the SPL framework a legacy image is generated as part
 261           of the build. This contains U-Boot along with information as to
 262           where it should be loaded. This option instead enables generation
 263           of a FIT (Flat Image Tree) which provides more flexibility. In
 264           particular it can handle selecting from multiple device tree
 265           and passing the correct one to U-Boot.
 266
 267 config SPL_FIT_IMAGE_POST_PROCESS
 268         bool "Enable post-processing of FIT artifacts after loading by the SPL"
 269         depends on SPL_LOAD_FIT && TI_SECURE_DEVICE
 270         help
 271           Allows doing any sort of manipulation to blobs after they got extracted
 272           from the U-Boot FIT image like stripping off headers or modifying the
 273           size of the blob, verification, authentication, decryption etc. in a
 274           platform or board specific way. In order to use this feature a platform
 275           or board-specific implementation of board_fit_image_post_process() must
 276           be provided. Also, anything done during this post-processing step would
 277           need to be comprehended in how the images were prepared before being
 278           injected into the FIT creation (i.e. the blobs would have been pre-
 279           processed before being added to the FIT image).
 280
 281 config FIT_IMAGE_POST_PROCESS
 282         bool "Enable post-processing of FIT artifacts after loading by U-Boot"
 283         depends on FIT && TI_SECURE_DEVICE
 284         help
 285           Allows doing any sort of manipulation to blobs after they got extracted
 286           from FIT images like stripping off headers or modifying the size of the
 287           blob, verification, authentication, decryption etc. in a platform or
 288           board specific way. In order to use this feature a platform or board-
 289           specific implementation of board_fit_image_post_process() must be
 290           provided. Also, anything done during this post-processing step would
 291           need to be comprehended in how the images were prepared before being
 292           injected into the FIT creation (i.e. the blobs would have been pre-
 293           processed before being added to the FIT image).
 294
 295 config SYS_CLK_FREQ
 296         depends on ARC || ARCH_SUNXI
 297         int "CPU clock frequency"
 298         help
 299           TODO: Move CONFIG_SYS_CLK_FREQ for all the architecture
 300
 301 config ARCH_FIXUP_FDT
 302         bool "Enable arch_fixup_fdt() call"
 303         depends on ARM || MIPS
 304         default y
 305         help
 306           Enable FDT memory map syncup before OS boot. This feature can be
 307           used for booting OS with different memory setup where the part of
 308           the memory location should be used for different purpose.
 309
 310 endmenu         # Boot images
 311
 312 source "common/Kconfig"
 313
 314 source "cmd/Kconfig"
 315
 316 source "dts/Kconfig"
 317
 318 source "net/Kconfig"
 319
 320 source "drivers/Kconfig"
 321
 322 source "fs/Kconfig"
 323
 324 source "lib/Kconfig"
 325
 326 source "test/Kconfig"