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 n
  60         select CMD_BOOTZ
  61         select CMD_DHCP
  62         select CMD_EXT2
  63         select CMD_EXT4
  64         select CMD_FAT
  65         select CMD_FS_GENERIC
  66         select CMD_MII
  67         select CMD_PING
  68         select HUSH_PARSER
  69         help
  70           Select this to enable various options and commands which are suitable
  71           for building u-boot for booting general purpose Linux distributions.
  72
  73 config SYS_MALLOC_F
  74         bool "Enable malloc() pool before relocation"
  75         default y if DM
  76         help
  77           Before relocation, memory is very limited on many platforms. Still,
  78           we can provide a small malloc() pool if needed. Driver model in
  79           particular needs this to operate, so that it can allocate the
  80           initial serial device and any others that are needed.
  81
  82 config SYS_MALLOC_F_LEN
  83         hex "Size of malloc() pool before relocation"
  84         depends on SYS_MALLOC_F
  85         default 0x400
  86         help
  87           Before relocation, memory is very limited on many platforms. Still,
  88           we can provide a small malloc() pool if needed. Driver model in
  89           particular needs this to operate, so that it can allocate the
  90           initial serial device and any others that are needed.
  91
  92 menuconfig EXPERT
  93         bool "Configure standard U-Boot features (expert users)"
  94         default y
  95         help
  96           This option allows certain base U-Boot options and settings
  97           to be disabled or tweaked. This is for specialized
  98           environments which can tolerate a "non-standard" U-Boot.
  99           Use this only if you really know what you are doing.
 100
 101 if EXPERT
 102         config SYS_MALLOC_CLEAR_ON_INIT
 103         bool "Init with zeros the memory reserved for malloc (slow)"
 104         default y
 105         help
 106           This setting is enabled by default. The reserved malloc
 107           memory is initialized with zeros, so first malloc calls
 108           will return the pointer to the zeroed memory. But this
 109           slows the boot time.
 110
 111           It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
 112           value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
 113           Then the boot time can be significantly reduced.
 114           Warning:
 115           When disabling this, please check if malloc calls, maybe
 116           should be replaced by calloc - if one expects zeroed memory.
 117
 118 config TOOLS_DEBUG
 119         bool "Enable debug information for tools"
 120         help
 121           Enable generation of debug information for tools such as mkimage.
 122           This can be used for debugging purposes. With debug information
 123           it is possible to set breakpoints on particular lines, single-step
 124           debug through the source code, etc.
 125
 126 endif
 127 endmenu         # General setup
 128
 129 menu "Boot images"
 130
 131 config SUPPORT_SPL
 132         bool
 133
 134 config SUPPORT_TPL
 135         bool
 136
 137 config SPL
 138         bool
 139         depends on SUPPORT_SPL
 140         prompt "Enable SPL"
 141         help
 142           If you want to build SPL as well as the normal image, say Y.
 143
 144 config SPL_SYS_MALLOC_SIMPLE
 145         bool
 146         depends on SPL
 147         prompt "Only use malloc_simple functions in the SPL"
 148         help
 149           Say Y here to only use the *_simple malloc functions from
 150           malloc_simple.c, rather then using the versions from dlmalloc.c;
 151           this will make the SPL binary smaller at the cost of more heap
 152           usage as the *_simple malloc functions do not re-use free-ed mem.
 153
 154 config SPL_STACK_R
 155         depends on SPL
 156         bool "Enable SDRAM location for SPL stack"
 157         help
 158           SPL starts off execution in SRAM and thus typically has only a small
 159           stack available. Since SPL sets up DRAM while in its board_init_f()
 160           function, it is possible for the stack to move there before
 161           board_init_r() is reached. This option enables a special SDRAM
 162           location for the SPL stack. U-Boot SPL switches to this after
 163           board_init_f() completes, and before board_init_r() starts.
 164
 165 config SPL_STACK_R_ADDR
 166         depends on SPL_STACK_R
 167         hex "SDRAM location for SPL stack"
 168         help
 169           Specify the address in SDRAM for the SPL stack. This will be set up
 170           before board_init_r() is called.
 171
 172 config SPL_STACK_R_MALLOC_SIMPLE_LEN
 173         depends on SPL_STACK_R && SPL_SYS_MALLOC_SIMPLE
 174         hex "Size of malloc_simple heap after switching to DRAM SPL stack"
 175         default 0x100000
 176         help
 177           Specify the amount of the stack to use as memory pool for
 178           malloc_simple after switching the stack to DRAM. This may be set
 179           to give board_init_r() a larger heap then the initial heap in
 180           SRAM which is limited to SYS_MALLOC_F_LEN bytes.
 181
 182 config SPL_SEPARATE_BSS
 183         depends on SPL
 184         bool "BSS section is in a different memory region from text"
 185         help
 186           Some platforms need a large BSS region in SPL and can provide this
 187           because RAM is already set up. In this case BSS can be moved to RAM.
 188           This option should then be enabled so that the correct device tree
 189           location is used. Normally we put the device tree at the end of BSS
 190           but with this option enabled, it goes at _image_binary_end.
 191
 192 config TPL
 193         bool
 194         depends on SPL && SUPPORT_TPL
 195         prompt "Enable TPL"
 196         help
 197           If you want to build TPL as well as the normal image and SPL, say Y.
 198
 199 config FIT
 200         bool "Support Flattened Image Tree"
 201         help
 202           This option allows to boot the new uImage structrure,
 203           Flattened Image Tree.  FIT is formally a FDT, which can include
 204           images of various types (kernel, FDT blob, ramdisk, etc.)
 205           in a single blob.  To boot this new uImage structure,
 206           pass the address of the blob to the "bootm" command.
 207           FIT is very flexible, supporting compression, multiple images,
 208           multiple configurations, verification through hashing and also
 209           verified boot (secure boot using RSA). This option enables that
 210           feature.
 211
 212 config SPL_FIT
 213         bool "Support Flattened Image Tree within SPL"
 214         depends on FIT
 215         depends on SPL
 216
 217 config FIT_VERBOSE
 218         bool "Display verbose messages on FIT boot"
 219         depends on FIT
 220
 221 config FIT_SIGNATURE
 222         bool "Enable signature verification of FIT uImages"
 223         depends on FIT
 224         depends on DM
 225         select RSA
 226         help
 227           This option enables signature verification of FIT uImages,
 228           using a hash signed and verified using RSA. If
 229           CONFIG_SHA_PROG_HW_ACCEL is defined, i.e support for progressive
 230           hashing is available using hardware, then then RSA library will use
 231           it. See doc/uImage.FIT/signature.txt for more details.
 232
 233           WARNING: When relying on signed FIT images with a required signature
 234           check the legacy image format is disabled by default, so that
 235           unsigned images cannot be loaded. If a board needs the legacy image
 236           format support in this case, enable it using
 237           CONFIG_IMAGE_FORMAT_LEGACY.
 238
 239 config SPL_FIT_SIGNATURE
 240         bool "Enable signature verification of FIT firmware within SPL"
 241         depends on SPL_FIT
 242         depends on SPL_DM
 243         select SPL_RSA
 244
 245 config FIT_BEST_MATCH
 246         bool "Select the best match for the kernel device tree"
 247         depends on FIT
 248         help
 249           When no configuration is explicitly selected, default to the
 250           one whose fdt's compatibility field best matches that of
 251           U-Boot itself. A match is considered "best" if it matches the
 252           most specific compatibility entry of U-Boot's fdt's root node.
 253           The order of entries in the configuration's fdt is ignored.
 254
 255 config FIT_VERBOSE
 256         bool "Show verbose messages when FIT images fails"
 257         depends on FIT
 258         help
 259           Generally a system will have valid FIT images so debug messages
 260           are a waste of code space. If you are debugging your images then
 261           you can enable this option to get more verbose information about
 262           failures.
 263
 264 config OF_BOARD_SETUP
 265         bool "Set up board-specific details in device tree before boot"
 266         depends on OF_LIBFDT
 267         help
 268           This causes U-Boot to call ft_board_setup() before booting into
 269           the Operating System. This function can set up various
 270           board-specific information in the device tree for use by the OS.
 271           The device tree is then passed to the OS.
 272
 273 config OF_SYSTEM_SETUP
 274         bool "Set up system-specific details in device tree before boot"
 275         depends on OF_LIBFDT
 276         help
 277           This causes U-Boot to call ft_system_setup() before booting into
 278           the Operating System. This function can set up various
 279           system-specific information in the device tree for use by the OS.
 280           The device tree is then passed to the OS.
 281
 282 config OF_STDOUT_VIA_ALIAS
 283         bool "Update the device-tree stdout alias from U-Boot"
 284         depends on OF_LIBFDT
 285         help
 286           This uses U-Boot's serial alias from the aliases node to update
 287           the device tree passed to the OS. The "linux,stdout-path" property
 288           in the chosen node is set to point to the correct serial node.
 289           This option currently references CONFIG_CONS_INDEX, which is
 290           incorrect when used with device tree as this option does not
 291           exist / should not be used.
 292
 293 config SYS_EXTRA_OPTIONS
 294         string "Extra Options (DEPRECATED)"
 295         help
 296           The old configuration infrastructure (= mkconfig + boards.cfg)
 297           provided the extra options field. If you have something like
 298           "HAS_BAR,BAZ=64", the optional options
 299             #define CONFIG_HAS
 300             #define CONFIG_BAZ  64
 301           will be defined in include/config.h.
 302           This option was prepared for the smooth migration from the old
 303           configuration to Kconfig. Since this option will be removed sometime,
 304           new boards should not use this option.
 305
 306 config SYS_TEXT_BASE
 307         depends on SPARC || ARC || X86 || ARCH_UNIPHIER || ARCH_ZYNQMP || \
 308                 (M68K && !TARGET_ASTRO_MCF5373L) || MICROBLAZE || MIPS
 309         depends on !EFI_APP
 310         hex "Text Base"
 311         help
 312           TODO: Move CONFIG_SYS_TEXT_BASE for all the architecture
 313
 314 config SPL_LOAD_FIT
 315         bool "Enable SPL loading U-Boot as a FIT"
 316         depends on FIT
 317         help
 318           Normally with the SPL framework a legacy image is generated as part
 319           of the build. This contains U-Boot along with information as to
 320           where it should be loaded. This option instead enables generation
 321           of a FIT (Flat Image Tree) which provides more flexibility. In
 322           particular it can handle selecting from multiple device tree
 323           and passing the correct one to U-Boot.
 324
 325 config SPL_FIT_IMAGE_POST_PROCESS
 326         bool "Enable post-processing of FIT artifacts after loading by the SPL"
 327         depends on SPL_LOAD_FIT && TI_SECURE_DEVICE
 328         help
 329           Allows doing any sort of manipulation to blobs after they got extracted
 330           from the U-Boot FIT image like stripping off headers or modifying the
 331           size of the blob, verification, authentication, decryption etc. in a
 332           platform or board specific way. In order to use this feature a platform
 333           or board-specific implementation of board_fit_image_post_process() must
 334           be provided. Also, anything done during this post-processing step would
 335           need to be comprehended in how the images were prepared before being
 336           injected into the FIT creation (i.e. the blobs would have been pre-
 337           processed before being added to the FIT image).
 338
 339 config SYS_CLK_FREQ
 340         depends on ARC || ARCH_SUNXI
 341         int "CPU clock frequency"
 342         help
 343           TODO: Move CONFIG_SYS_CLK_FREQ for all the architecture
 344
 345 config ARCH_FIXUP_FDT
 346         bool "Enable arch_fixup_fdt() call"
 347         depends on ARM || MIPS
 348         default y
 349         help
 350           Enable FDT memory map syncup before OS boot. This feature can be
 351           used for booting OS with different memory setup where the part of
 352           the memory location should be used for different purpose.
 353
 354 endmenu         # Boot images
 355
 356 source "common/Kconfig"
 357
 358 source "cmd/Kconfig"
 359
 360 source "dts/Kconfig"
 361
 362 source "net/Kconfig"
 363
 364 source "drivers/Kconfig"
 365
 366 source "fs/Kconfig"
 367
 368 source "lib/Kconfig"
 369
 370 source "test/Kconfig"