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 SYS_MALLOC_F
  57         bool "Enable malloc() pool before relocation"
  58         default y if DM
  59         help
  60           Before relocation, memory is very limited on many platforms. Still,
  61           we can provide a small malloc() pool if needed. Driver model in
  62           particular needs this to operate, so that it can allocate the
  63           initial serial device and any others that are needed.
  64
  65 config SYS_MALLOC_F_LEN
  66         hex "Size of malloc() pool before relocation"
  67         depends on SYS_MALLOC_F
  68         default 0x400
  69         help
  70           Before relocation, memory is very limited on many platforms. Still,
  71           we can provide a small malloc() pool if needed. Driver model in
  72           particular needs this to operate, so that it can allocate the
  73           initial serial device and any others that are needed.
  74
  75 menuconfig EXPERT
  76         bool "Configure standard U-Boot features (expert users)"
  77         default y
  78         help
  79           This option allows certain base U-Boot options and settings
  80           to be disabled or tweaked. This is for specialized
  81           environments which can tolerate a "non-standard" U-Boot.
  82           Use this only if you really know what you are doing.
  83
  84 if EXPERT
  85         config SYS_MALLOC_CLEAR_ON_INIT
  86         bool "Init with zeros the memory reserved for malloc (slow)"
  87         default y
  88         help
  89           This setting is enabled by default. The reserved malloc
  90           memory is initialized with zeros, so first malloc calls
  91           will return the pointer to the zeroed memory. But this
  92           slows the boot time.
  93
  94           It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
  95           value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
  96           Then the boot time can be significantly reduced.
  97           Warning:
  98           When disabling this, please check if malloc calls, maybe
  99           should be replaced by calloc - if one expects zeroed memory.
 100 endif
 101 endmenu         # General setup
 102
 103 menu "Boot images"
 104
 105 config SUPPORT_SPL
 106         bool
 107
 108 config SUPPORT_TPL
 109         bool
 110
 111 config SPL
 112         bool
 113         depends on SUPPORT_SPL
 114         prompt "Enable SPL"
 115         help
 116           If you want to build SPL as well as the normal image, say Y.
 117
 118 config SPL_SYS_MALLOC_SIMPLE
 119         bool
 120         depends on SPL
 121         prompt "Only use malloc_simple functions in the SPL"
 122         help
 123           Say Y here to only use the *_simple malloc functions from
 124           malloc_simple.c, rather then using the versions from dlmalloc.c;
 125           this will make the SPL binary smaller at the cost of more heap
 126           usage as the *_simple malloc functions do not re-use free-ed mem.
 127
 128 config SPL_STACK_R
 129         depends on SPL
 130         bool "Enable SDRAM location for SPL stack"
 131         help
 132           SPL starts off execution in SRAM and thus typically has only a small
 133           stack available. Since SPL sets up DRAM while in its board_init_f()
 134           function, it is possible for the stack to move there before
 135           board_init_r() is reached. This option enables a special SDRAM
 136           location for the SPL stack. U-Boot SPL switches to this after
 137           board_init_f() completes, and before board_init_r() starts.
 138
 139 config SPL_STACK_R_ADDR
 140         depends on SPL_STACK_R
 141         hex "SDRAM location for SPL stack"
 142         help
 143           Specify the address in SDRAM for the SPL stack. This will be set up
 144           before board_init_r() is called.
 145
 146 config SPL_STACK_R_MALLOC_SIMPLE_LEN
 147         depends on SPL_STACK_R && SPL_SYS_MALLOC_SIMPLE
 148         hex "Size of malloc_simple heap after switching to DRAM SPL stack"
 149         default 0x100000
 150         help
 151           Specify the amount of the stack to use as memory pool for
 152           malloc_simple after switching the stack to DRAM. This may be set
 153           to give board_init_r() a larger heap then the initial heap in
 154           SRAM which is limited to SYS_MALLOC_F_LEN bytes.
 155
 156 config SPL_SEPARATE_BSS
 157         depends on SPL
 158         bool "BSS section is in a different memory region from text"
 159         help
 160           Some platforms need a large BSS region in SPL and can provide this
 161           because RAM is already set up. In this case BSS can be moved to RAM.
 162           This option should then be enabled so that the correct device tree
 163           location is used. Normally we put the device tree at the end of BSS
 164           but with this option enabled, it goes at _image_binary_end.
 165
 166 config TPL
 167         bool
 168         depends on SPL && SUPPORT_TPL
 169         prompt "Enable TPL"
 170         help
 171           If you want to build TPL as well as the normal image and SPL, say Y.
 172
 173 config FIT
 174         bool "Support Flattened Image Tree"
 175         help
 176           This option allows to boot the new uImage structrure,
 177           Flattened Image Tree.  FIT is formally a FDT, which can include
 178           images of various types (kernel, FDT blob, ramdisk, etc.)
 179           in a single blob.  To boot this new uImage structure,
 180           pass the address of the blob to the "bootm" command.
 181           FIT is very flexible, supporting compression, multiple images,
 182           multiple configurations, verification through hashing and also
 183           verified boot (secure boot using RSA). This option enables that
 184           feature.
 185
 186 config FIT_VERBOSE
 187         bool "Display verbose messages on FIT boot"
 188         depends on FIT
 189
 190 config FIT_SIGNATURE
 191         bool "Enable signature verification of FIT uImages"
 192         depends on FIT
 193         depends on DM
 194         select RSA
 195         help
 196           This option enables signature verification of FIT uImages,
 197           using a hash signed and verified using RSA. If
 198           CONFIG_SHA_PROG_HW_ACCEL is defined, i.e support for progressive
 199           hashing is available using hardware, then then RSA library will use
 200           it. See doc/uImage.FIT/signature.txt for more details.
 201
 202           WARNING: When relying on signed FIT images with a required signature
 203           check the legacy image format is disabled by default, so that
 204           unsigned images cannot be loaded. If a board needs the legacy image
 205           format support in this case, enable it using
 206           CONFIG_IMAGE_FORMAT_LEGACY.
 207
 208 config FIT_BEST_MATCH
 209         bool "Select the best match for the kernel device tree"
 210         depends on FIT
 211         help
 212           When no configuration is explicitly selected, default to the
 213           one whose fdt's compatibility field best matches that of
 214           U-Boot itself. A match is considered "best" if it matches the
 215           most specific compatibility entry of U-Boot's fdt's root node.
 216           The order of entries in the configuration's fdt is ignored.
 217
 218 config FIT_VERBOSE
 219         bool "Show verbose messages when FIT images fails"
 220         depends on FIT
 221         help
 222           Generally a system will have valid FIT images so debug messages
 223           are a waste of code space. If you are debugging your images then
 224           you can enable this option to get more verbose information about
 225           failures.
 226
 227 config OF_BOARD_SETUP
 228         bool "Set up board-specific details in device tree before boot"
 229         depends on OF_LIBFDT
 230         help
 231           This causes U-Boot to call ft_board_setup() before booting into
 232           the Operating System. This function can set up various
 233           board-specific information in the device tree for use by the OS.
 234           The device tree is then passed to the OS.
 235
 236 config OF_SYSTEM_SETUP
 237         bool "Set up system-specific details in device tree before boot"
 238         depends on OF_LIBFDT
 239         help
 240           This causes U-Boot to call ft_system_setup() before booting into
 241           the Operating System. This function can set up various
 242           system-specific information in the device tree for use by the OS.
 243           The device tree is then passed to the OS.
 244
 245 config OF_STDOUT_VIA_ALIAS
 246         bool "Update the device-tree stdout alias from U-Boot"
 247         depends on OF_LIBFDT
 248         help
 249           This uses U-Boot's serial alias from the aliases node to update
 250           the device tree passed to the OS. The "linux,stdout-path" property
 251           in the chosen node is set to point to the correct serial node.
 252           This option currently references CONFIG_CONS_INDEX, which is
 253           incorrect when used with device tree as this option does not
 254           exist / should not be used.
 255
 256 config SYS_EXTRA_OPTIONS
 257         string "Extra Options (DEPRECATED)"
 258         help
 259           The old configuration infrastructure (= mkconfig + boards.cfg)
 260           provided the extra options field. If you have something like
 261           "HAS_BAR,BAZ=64", the optional options
 262             #define CONFIG_HAS
 263             #define CONFIG_BAZ  64
 264           will be defined in include/config.h.
 265           This option was prepared for the smooth migration from the old
 266           configuration to Kconfig. Since this option will be removed sometime,
 267           new boards should not use this option.
 268
 269 config SYS_TEXT_BASE
 270         depends on SPARC || ARC || X86 || ARCH_UNIPHIER || ARCH_ZYNQMP || \
 271                 (M68K && !TARGET_ASTRO_MCF5373L) || MICROBLAZE || MIPS
 272         depends on !EFI_APP
 273         hex "Text Base"
 274         help
 275           TODO: Move CONFIG_SYS_TEXT_BASE for all the architecture
 276
 277 config SPL_LOAD_FIT
 278         bool "Enable SPL loading U-Boot as a FIT"
 279         depends on FIT
 280         help
 281           Normally with the SPL framework a legacy image is generated as part
 282           of the build. This contains U-Boot along with information as to
 283           where it should be loaded. This option instead enables generation
 284           of a FIT (Flat Image Tree) which provides more flexibility. In
 285           particular it can handle selecting from multiple device tree
 286           and passing the correct one to U-Boot.
 287
 288 config SYS_CLK_FREQ
 289         depends on ARC || ARCH_SUNXI
 290         int "CPU clock frequency"
 291         help
 292           TODO: Move CONFIG_SYS_CLK_FREQ for all the architecture
 293
 294 endmenu         # Boot images
 295
 296 source "common/Kconfig"
 297
 298 source "cmd/Kconfig"
 299
 300 source "dts/Kconfig"
 301
 302 source "net/Kconfig"
 303
 304 source "drivers/Kconfig"
 305
 306 source "fs/Kconfig"
 307
 308 source "lib/Kconfig"
 309
 310 source "test/Kconfig"