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 comment "Compiler: $(CC_VERSION_TEXT)"
   9
  10 source "scripts/Kconfig.include"
  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 DEPRECATED
  24         bool
  25         help
  26           This option cannot be enabled.  It it used as a dependency for
  27           code that relies on deprecated features that will be removed and
  28           the conversion deadline has passed.
  29
  30 config LOCALVERSION
  31         string "Local version - append to U-Boot release"
  32         help
  33           Append an extra string to the end of your U-Boot version.
  34           This will show up in your boot log, for example.
  35           The string you set here will be appended after the contents of
  36           any files with a filename matching localversion* in your
  37           object and source tree, in that order.  Your total string can
  38           be a maximum of 64 characters.
  39
  40 config LOCALVERSION_AUTO
  41         bool "Automatically append version information to the version string"
  42         default y
  43         help
  44           This will try to automatically determine if the current tree is a
  45           release tree by looking for Git tags that belong to the current
  46           top of tree revision.
  47
  48           A string of the format -gxxxxxxxx will be added to the localversion
  49           if a Git-based tree is found.  The string generated by this will be
  50           appended after any matching localversion* files, and after the value
  51           set in CONFIG_LOCALVERSION.
  52
  53           (The actual string used here is the first eight characters produced
  54           by running the command:
  55
  56             $ git rev-parse --verify HEAD
  57
  58           which is done within the script "scripts/setlocalversion".)
  59
  60 config CC_IS_GCC
  61         def_bool $(success,$(CC) --version | head -n 1 | grep -q gcc)
  62
  63 config GCC_VERSION
  64         int
  65         default $(shell,$(srctree)/scripts/gcc-version.sh -p $(CC) | sed 's/^0*//') if CC_IS_GCC
  66         default 0
  67
  68 config CC_IS_CLANG
  69         def_bool $(success,$(CC) --version | head -n 1 | grep -q clang)
  70
  71 config CLANG_VERSION
  72         int
  73         default $(shell,$(srctree)/scripts/clang-version.sh $(CC))
  74
  75 config CC_OPTIMIZE_FOR_SIZE
  76         bool "Optimize for size"
  77         default y
  78         help
  79           Enabling this option will pass "-Os" instead of "-O2" to gcc
  80           resulting in a smaller U-Boot image.
  81
  82           This option is enabled by default for U-Boot.
  83
  84 config OPTIMIZE_INLINING
  85         bool "Allow compiler to uninline functions marked 'inline' in full U-Boot"
  86         help
  87           This option determines if U-Boot forces gcc to inline the functions
  88           developers have marked 'inline'. Doing so takes away freedom from gcc to
  89           do what it thinks is best, which is desirable in some cases for size
  90           reasons.
  91
  92 config SPL_OPTIMIZE_INLINING
  93         bool "Allow compiler to uninline functions marked 'inline' in SPL"
  94         depends on SPL
  95         help
  96           This option determines if U-Boot forces gcc to inline the functions
  97           developers have marked 'inline'. Doing so takes away freedom from gcc to
  98           do what it thinks is best, which is desirable in some cases for size
  99           reasons.
 100
 101 config ARCH_SUPPORTS_LTO
 102         bool
 103
 104 config LTO
 105         bool "Enable Link Time Optimizations"
 106         depends on ARCH_SUPPORTS_LTO
 107         help
 108           This option enables Link Time Optimization (LTO), a mechanism which
 109           allows the compiler to optimize between different compilation units.
 110
 111           This can optimize away dead code paths, resulting in smaller binary
 112           size (if CC_OPTIMIZE_FOR_SIZE is enabled).
 113
 114           This option is not available for every architecture and may
 115           introduce bugs.
 116
 117           Currently, when compiling with GCC, due to a weird bug regarding
 118           jobserver, the final linking will not respect make's --jobs argument.
 119           Instead all available processors will be used (as reported by the
 120           nproc command).
 121
 122           If unsure, say n.
 123
 124 config TPL_OPTIMIZE_INLINING
 125         bool "Allow compiler to uninline functions marked 'inline' in TPL"
 126         depends on TPL
 127         help
 128           This option determines if U-Boot forces gcc to inline the functions
 129           developers have marked 'inline'. Doing so takes away freedom from gcc to
 130           do what it thinks is best, which is desirable in some cases for size
 131           reasons.
 132
 133 config CC_COVERAGE
 134         bool "Enable code coverage analysis"
 135         depends on SANDBOX
 136         help
 137           Enabling this option will pass "--coverage" to gcc to compile
 138           and link code instrumented for coverage analysis.
 139
 140 config CC_HAS_ASM_INLINE
 141         def_bool $(success,echo 'void foo(void) { asm inline (""); }' | $(CC) -x c - -c -o /dev/null)
 142
 143 config XEN
 144         bool "Select U-Boot be run as a bootloader for XEN Virtual Machine"
 145         help
 146           Enabling this option will make U-Boot be run as a bootloader
 147           for XEN [1] Virtual Machine.
 148
 149           Xen is a virtual machine monitor (VMM) or a type-1 hypervisor with support
 150           for para-virtualization. Xen can organize the safe execution of several
 151           virtual machines on the same physical system with performance close to
 152           native. It is used as the basis for a number of different commercial and
 153           open source applications, such as: server virtualization, Infrastructure
 154           as a Service (IaaS), desktop virtualization, security applications,
 155           embedded and hardware appliances.
 156           Xen has a special VM called Domain-0 that runs the Dom0 kernel and allows
 157           Xen to use the device drivers for the Domain-0 kernel by default.
 158
 159           [1] - https://xenproject.org/
 160
 161 config DISTRO_DEFAULTS
 162         bool "Select defaults suitable for booting general purpose Linux distributions"
 163         select AUTO_COMPLETE
 164         select CMDLINE_EDITING
 165         select CMD_BOOTI if ARM64
 166         select CMD_BOOTZ if ARM && !ARM64
 167         select CMD_DHCP if CMD_NET
 168         select CMD_ENV_EXISTS
 169         select CMD_EXT2
 170         select CMD_EXT4
 171         select CMD_FAT
 172         select CMD_FS_GENERIC
 173         select CMD_PART if PARTITIONS
 174         select CMD_PING if CMD_NET
 175         select CMD_PXE if NET
 176         select CMD_SYSBOOT
 177         select ENV_VARS_UBOOT_CONFIG
 178         select HUSH_PARSER
 179         select SUPPORT_RAW_INITRD
 180         select SYS_LONGHELP
 181         imply CMD_MII if NET
 182         imply USB_STORAGE
 183         imply USE_BOOTCOMMAND
 184         help
 185           Select this to enable various options and commands which are suitable
 186           for building u-boot for booting general purpose Linux distributions.
 187
 188 config ENV_VARS_UBOOT_CONFIG
 189         bool "Add arch, board, vendor and soc variables to default environment"
 190         help
 191           Define this in order to add variables describing the
 192           U-Boot build configuration to the default environment.
 193           These will be named arch, cpu, board, vendor, and soc.
 194           Enabling this option will cause the following to be defined:
 195           - CONFIG_SYS_ARCH
 196           - CONFIG_SYS_CPU
 197           - CONFIG_SYS_BOARD
 198           - CONFIG_SYS_VENDOR
 199           - CONFIG_SYS_SOC
 200
 201 config NR_DRAM_BANKS
 202         int "Number of DRAM banks"
 203         default 1 if ARCH_SUNXI || ARCH_OWL
 204         default 4
 205         help
 206           This defines the number of DRAM banks.
 207
 208 config SYS_BOOT_GET_CMDLINE
 209         bool "Enable kernel command line setup"
 210         help
 211           Enables allocating and saving kernel cmdline in space between
 212           "bootm_low" and "bootm_low" + BOOTMAPSZ.
 213
 214 config SYS_BOOT_GET_KBD
 215         bool "Enable kernel board information setup"
 216         help
 217           Enables allocating and saving a kernel copy of the bd_info in
 218           space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
 219
 220 config SYS_MALLOC_F
 221         bool "Enable malloc() pool before relocation"
 222         default y if DM
 223
 224         help
 225           Before relocation, memory is very limited on many platforms. Still,
 226           we can provide a small malloc() pool if needed. Driver model in
 227           particular needs this to operate, so that it can allocate the
 228           initial serial device and any others that are needed.
 229
 230 config SYS_MALLOC_F_LEN
 231         hex "Size of malloc() pool before relocation"
 232         depends on SYS_MALLOC_F
 233         default 0x1000 if AM33XX
 234         default 0x4000 if SANDBOX
 235         default 0x2000 if (ARCH_IMX8 || ARCH_IMX8M || ARCH_MX7 || \
 236                            ARCH_MX7ULP || ARCH_MX6 || ARCH_MX5 || \
 237                            ARCH_LS1012A || ARCH_LS1021A || ARCH_LS1043A || \
 238                            ARCH_LS1046A || ARCH_QEMU || ARCH_SUNXI || ARCH_OWL)
 239         default 0x400
 240         help
 241           Before relocation, memory is very limited on many platforms. Still,
 242           we can provide a small malloc() pool if needed. Driver model in
 243           particular needs this to operate, so that it can allocate the
 244           initial serial device and any others that are needed.
 245
 246 config SYS_MALLOC_LEN
 247         hex "Define memory for Dynamic allocation"
 248         default 0x2000000 if ARCH_ROCKCHIP || ARCH_OMAP2PLUS || ARCH_MESON
 249         default 0x200000 if ARCH_BMIPS || X86
 250         default 0x120000 if MACH_SUNIV
 251         default 0x220000 if MACH_SUN8I_V3S
 252         default 0x4020000 if ARCH_SUNXI
 253         default 0x400000
 254         help
 255           This defines memory to be allocated for Dynamic allocation
 256           TODO: Use for other architectures
 257
 258 config SPL_SYS_MALLOC_F_LEN
 259         hex "Size of malloc() pool in SPL"
 260         depends on SYS_MALLOC_F && SPL
 261         default 0x2800 if RCAR_GEN3
 262         default SYS_MALLOC_F_LEN
 263         help
 264           In SPL memory is very limited on many platforms. Still,
 265           we can provide a small malloc() pool if needed. Driver model in
 266           particular needs this to operate, so that it can allocate the
 267           initial serial device and any others that are needed.
 268
 269           It is possible to enable CONFIG_SYS_SPL_MALLOC_START to start a new
 270           malloc() region in SDRAM once it is inited.
 271
 272 config TPL_SYS_MALLOC_F_LEN
 273         hex "Size of malloc() pool in TPL"
 274         depends on SYS_MALLOC_F && TPL
 275         default SPL_SYS_MALLOC_F_LEN
 276         help
 277           In TPL memory is very limited on many platforms. Still,
 278           we can provide a small malloc() pool if needed. Driver model in
 279           particular needs this to operate, so that it can allocate the
 280           initial serial device and any others that are needed.
 281
 282 menuconfig EXPERT
 283         bool "Configure standard U-Boot features (expert users)"
 284         default y
 285         help
 286           This option allows certain base U-Boot options and settings
 287           to be disabled or tweaked. This is for specialized
 288           environments which can tolerate a "non-standard" U-Boot.
 289           Use this only if you really know what you are doing.
 290
 291 if EXPERT
 292         config SYS_MALLOC_CLEAR_ON_INIT
 293         bool "Init with zeros the memory reserved for malloc (slow)"
 294         default y
 295         help
 296           This setting is enabled by default. The reserved malloc
 297           memory is initialized with zeros, so first malloc calls
 298           will return the pointer to the zeroed memory. But this
 299           slows the boot time.
 300
 301           It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
 302           value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
 303           Then the boot time can be significantly reduced.
 304           Warning:
 305           When disabling this, please check if malloc calls, maybe
 306           should be replaced by calloc - if one expects zeroed memory.
 307
 308 config SYS_MALLOC_DEFAULT_TO_INIT
 309         bool "Default malloc to init while reserving the memory for it"
 310         help
 311           It may happen that one needs to move the dynamic allocation
 312           from one to another memory range, eg. when moving the malloc
 313           from the limited static to a potentially large dynamic (DDR)
 314           memory.
 315
 316           If so then on top of setting the updated memory aside one
 317           needs to bring the malloc init.
 318
 319           If such a scenario is sought choose yes.
 320
 321 config TOOLS_DEBUG
 322         bool "Enable debug information for tools"
 323         help
 324           Enable generation of debug information for tools such as mkimage.
 325           This can be used for debugging purposes. With debug information
 326           it is possible to set breakpoints on particular lines, single-step
 327           debug through the source code, etc.
 328
 329 endif # EXPERT
 330
 331 config PHYS_64BIT
 332         bool "64bit physical address support"
 333         help
 334           Say Y here to support 64bit physical memory address.
 335           This can be used not only for 64bit SoCs, but also for
 336           large physical address extension on 32bit SoCs.
 337
 338 config HAS_ROM
 339         bool
 340         select BINMAN
 341         help
 342           Enables building of a u-boot.rom target. This collects U-Boot and
 343           any necessary binary blobs.
 344
 345 config SPL_IMAGE
 346         string "SPL image used in the combined SPL+U-Boot image"
 347         default "spl/boot.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
 348         default "spl/u-boot-spl.bin"
 349         depends on SPL
 350         help
 351           Select the SPL build target that shall be generated by the SPL
 352           build process (default spl/u-boot-spl.bin). This image will be
 353           used to generate a combined image with SPL and main U-Boot
 354           proper as one single image.
 355
 356 config REMAKE_ELF
 357         bool "Recreate an ELF image from raw U-Boot binary"
 358         help
 359           Enable this to recreate an ELF image (u-boot.elf) from the raw
 360           U-Boot binary (u-boot.bin), which may already have been statically
 361           relocated and may already have a device-tree appended to it.
 362
 363 config BUILD_TARGET
 364         string "Build target special images"
 365         default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_ARRIA10
 366         default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_GEN5
 367         default "u-boot-spl.kwb" if ARCH_MVEBU && SPL
 368         default "u-boot-elf.srec" if RCAR_GEN3
 369         default "u-boot.itb" if !BINMAN && SPL_LOAD_FIT && (ARCH_ROCKCHIP || \
 370                                 ARCH_SUNXI || RISCV || ARCH_ZYNQMP)
 371         default "u-boot.kwb" if ARCH_KIRKWOOD
 372         default "u-boot-with-spl.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
 373         default "u-boot-with-spl.imx" if ARCH_MX6 && SPL
 374         help
 375           Some SoCs need special image types (e.g. U-Boot binary
 376           with a special header) as build targets. By defining
 377           CONFIG_BUILD_TARGET in the SoC / board header, this
 378           special image will be automatically built upon calling
 379           make / buildman.
 380
 381 config SYS_CUSTOM_LDSCRIPT
 382         bool "Use a custom location for the U-Boot linker script"
 383         help
 384           Normally when linking U-Boot we will look in the board directory,
 385           the CPU directory and finally the "cpu" directory of the architecture
 386           for the ile "u-boot.lds" and use that as our linker.  However, in
 387           some cases we need to provide a different linker script.  To do so,
 388           enable this option and then provide the location under
 389           CONFIG_SYS_LDSCRIPT.
 390
 391 config SYS_LDSCRIPT
 392         depends on SYS_CUSTOM_LDSCRIPT
 393         string "Custom ldscript location"
 394         help
 395           Path within the source tree to the linker script to use for the
 396           main U-Boot binary.
 397
 398 config SYS_LOAD_ADDR
 399         hex "Address in memory to use by default"
 400         default 0x01000000 if ARCH_SOCFPGA
 401         default 0x02000000 if PPC || X86
 402         default 0x81000000 if MACH_SUNIV
 403         default 0x22000000 if MACH_SUN9I
 404         default 0x42000000 if ARCH_SUNXI
 405         default 0x82000000 if ARCH_KEYSTONE || ARCH_OMAP2PLUS || ARCH_K3
 406         default 0x82000000 if ARCH_MX6 && (MX6SL || MX6SLL  || MX6SX || MX6UL || MX6ULL)
 407         default 0x12000000 if ARCH_MX6 && !(MX6SL || MX6SLL  || MX6SX || MX6UL || MX6ULL)
 408         default 0x80800000 if ARCH_MX7
 409         default 0x90000000 if FSL_LSCH2 || FSL_LSCH3
 410         help
 411           Address in memory to use as the default safe load address.
 412
 413 config ERR_PTR_OFFSET
 414         hex
 415         default 0x0
 416         help
 417           Some U-Boot pointers have redundant information, so we can use a
 418           scheme where we can return either an error code or a pointer with the
 419           same return value. The default implementation just casts the pointer
 420           to a number, however, this may fail on platforms where the end of the
 421           address range is used for valid pointers (e.g. 0xffffff00 is a valid
 422           heap pointer in socfpga SPL).
 423           For such platforms, this value provides an upper range of those error
 424           pointer values - up to 'MAX_ERRNO' bytes below this value must be
 425           unused/invalid addresses.
 426
 427 config PLATFORM_ELFENTRY
 428         string
 429         default "__start" if MIPS
 430         default "_start"
 431
 432 config STACK_SIZE
 433         hex "Define max stack size that can be used by U-Boot"
 434         default 0x4000000 if ARCH_VERSAL || ARCH_ZYNQMP
 435         default 0x200000 if MICROBLAZE
 436         default 0x1000000
 437         help
 438           Define Max stack size that can be used by U-Boot. This value is used
 439           by the UEFI sub-system. On some boards initrd_high is calculated as
 440           base stack pointer minus this stack size.
 441
 442 config SYS_HAS_SRAM
 443         bool
 444         default y if TARGET_PIC32MZDASK
 445         default y if TARGET_DEVKIT8000
 446         default y if TARGET_TRICORDER
 447         help
 448           Enable this to allow support for the on board SRAM.
 449           SRAM base address is controlled by CONFIG_SYS_SRAM_BASE.
 450           SRAM size is controlled by CONFIG_SYS_SRAM_SIZE.
 451
 452 config SYS_SRAM_BASE
 453         hex
 454         default 0x80000000 if TARGET_PIC32MZDASK
 455         default 0x40200000 if TARGET_DEVKIT8000
 456         default 0x40200000 if TARGET_TRICORDER
 457         default 0x0
 458
 459 config SYS_SRAM_SIZE
 460         hex
 461         default 0x00080000 if TARGET_PIC32MZDASK
 462         default 0x10000 if TARGET_DEVKIT8000
 463         default 0x10000 if TARGET_TRICORDER
 464         default 0x0
 465
 466 config MP
 467         bool "Support for multiprocessor"
 468         help
 469           This provides an option to bringup different processors
 470           in multiprocessor cases.
 471
 472 config EXAMPLES
 473         bool "Compile API examples"
 474         depends on !SANDBOX
 475         default y if ARCH_QEMU
 476         help
 477           U-Boot provides an API for standalone applications. Examples are
 478           provided in directory examples/.
 479
 480 endmenu         # General setup
 481
 482 source "api/Kconfig"
 483
 484 source "boot/Kconfig"
 485
 486 source "common/Kconfig"
 487
 488 source "cmd/Kconfig"
 489
 490 source "disk/Kconfig"
 491
 492 source "dts/Kconfig"
 493
 494 source "env/Kconfig"
 495
 496 source "net/Kconfig"
 497
 498 source "drivers/Kconfig"
 499
 500 source "fs/Kconfig"
 501
 502 source "lib/Kconfig"
 503
 504 source "test/Kconfig"
 505
 506 source "tools/Kconfig"