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