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 choice
  76         prompt "Optimization level"
  77         default CC_OPTIMIZE_FOR_SIZE
  78
  79 config CC_OPTIMIZE_FOR_SIZE
  80         bool "Optimize for size"
  81         help
  82           Enabling this option will pass "-Os" to gcc, resulting in a smaller
  83           U-Boot image.
  84
  85           This option is enabled by default for U-Boot.
  86
  87 config CC_OPTIMIZE_FOR_SPEED
  88         bool "Optimize for speed"
  89         help
  90           Enabling this option will pass "-O2" to gcc, resulting in a faster
  91           U-Boot image.
  92
  93 config CC_OPTIMIZE_FOR_DEBUG
  94         bool "Optimize for debugging"
  95         help
  96           Enabling this option will pass "-Og" to gcc, enabling optimizations
  97           which don't interfere with debugging.
  98
  99 endchoice
 100
 101 config OPTIMIZE_INLINING
 102         bool "Allow compiler to uninline functions marked 'inline' in full U-Boot"
 103         help
 104           This option determines if U-Boot forces gcc to inline the functions
 105           developers have marked 'inline'. Doing so takes away freedom from gcc to
 106           do what it thinks is best, which is desirable in some cases for size
 107           reasons.
 108
 109 config SPL_OPTIMIZE_INLINING
 110         bool "Allow compiler to uninline functions marked 'inline' in SPL"
 111         depends on SPL
 112         help
 113           This option determines if U-Boot forces gcc to inline the functions
 114           developers have marked 'inline'. Doing so takes away freedom from gcc to
 115           do what it thinks is best, which is desirable in some cases for size
 116           reasons.
 117
 118 config ARCH_SUPPORTS_LTO
 119         bool
 120
 121 config LTO
 122         bool "Enable Link Time Optimizations"
 123         depends on ARCH_SUPPORTS_LTO
 124         help
 125           This option enables Link Time Optimization (LTO), a mechanism which
 126           allows the compiler to optimize between different compilation units.
 127
 128           This can optimize away dead code paths, resulting in smaller binary
 129           size (if CC_OPTIMIZE_FOR_SIZE is enabled).
 130
 131           This option is not available for every architecture and may
 132           introduce bugs.
 133
 134           Currently, when compiling with GCC, due to a weird bug regarding
 135           jobserver, the final linking will not respect make's --jobs argument.
 136           Instead all available processors will be used (as reported by the
 137           nproc command).
 138
 139           If unsure, say n.
 140
 141 config TPL_OPTIMIZE_INLINING
 142         bool "Allow compiler to uninline functions marked 'inline' in TPL"
 143         depends on TPL
 144         help
 145           This option determines if U-Boot forces gcc to inline the functions
 146           developers have marked 'inline'. Doing so takes away freedom from gcc to
 147           do what it thinks is best, which is desirable in some cases for size
 148           reasons.
 149
 150 config CC_COVERAGE
 151         bool "Enable code coverage analysis"
 152         depends on SANDBOX
 153         help
 154           Enabling this option will pass "--coverage" to gcc to compile
 155           and link code instrumented for coverage analysis.
 156
 157 config CC_HAS_ASM_INLINE
 158         def_bool $(success,echo 'void foo(void) { asm inline (""); }' | $(CC) -x c - -c -o /dev/null)
 159
 160 config XEN
 161         bool "Select U-Boot be run as a bootloader for XEN Virtual Machine"
 162         help
 163           Enabling this option will make U-Boot be run as a bootloader
 164           for XEN [1] Virtual Machine.
 165
 166           Xen is a virtual machine monitor (VMM) or a type-1 hypervisor with support
 167           for para-virtualization. Xen can organize the safe execution of several
 168           virtual machines on the same physical system with performance close to
 169           native. It is used as the basis for a number of different commercial and
 170           open source applications, such as: server virtualization, Infrastructure
 171           as a Service (IaaS), desktop virtualization, security applications,
 172           embedded and hardware appliances.
 173           Xen has a special VM called Domain-0 that runs the Dom0 kernel and allows
 174           Xen to use the device drivers for the Domain-0 kernel by default.
 175
 176           [1] - https://xenproject.org/
 177
 178 config DISTRO_DEFAULTS
 179         bool "Select defaults suitable for booting general purpose Linux distributions"
 180         select AUTO_COMPLETE
 181         select CMDLINE_EDITING
 182         select CMD_BOOTI if ARM64
 183         select CMD_BOOTZ if ARM && !ARM64
 184         select CMD_DHCP if CMD_NET
 185         select CMD_ENV_EXISTS
 186         select CMD_EXT2
 187         select CMD_EXT4
 188         select CMD_FAT
 189         select CMD_FS_GENERIC
 190         select CMD_PART if PARTITIONS
 191         select CMD_PING if CMD_NET
 192         select CMD_PXE if NET
 193         select CMD_SYSBOOT
 194         select ENV_VARS_UBOOT_CONFIG
 195         select HUSH_PARSER
 196         select SUPPORT_RAW_INITRD
 197         select SYS_LONGHELP
 198         imply CMD_MII if NET
 199         imply USB_STORAGE
 200         imply USE_BOOTCOMMAND
 201         help
 202           Select this to enable various options and commands which are suitable
 203           for building u-boot for booting general purpose Linux distributions.
 204
 205 config ENV_VARS_UBOOT_CONFIG
 206         bool "Add arch, board, vendor and soc variables to default environment"
 207         help
 208           Define this in order to add variables describing the
 209           U-Boot build configuration to the default environment.
 210           These will be named arch, cpu, board, vendor, and soc.
 211           Enabling this option will cause the following to be defined:
 212           - CONFIG_SYS_ARCH
 213           - CONFIG_SYS_CPU
 214           - CONFIG_SYS_BOARD
 215           - CONFIG_SYS_VENDOR
 216           - CONFIG_SYS_SOC
 217
 218 config NR_DRAM_BANKS
 219         int "Number of DRAM banks"
 220         default 1 if ARCH_SUNXI || ARCH_OWL
 221         default 4
 222         help
 223           This defines the number of DRAM banks.
 224
 225 config SYS_BOOT_GET_CMDLINE
 226         bool "Enable kernel command line setup"
 227         help
 228           Enables allocating and saving kernel cmdline in space between
 229           "bootm_low" and "bootm_low" + BOOTMAPSZ.
 230
 231 config SYS_BOOT_GET_KBD
 232         bool "Enable kernel board information setup"
 233         help
 234           Enables allocating and saving a kernel copy of the bd_info in
 235           space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
 236
 237 config SYS_MALLOC_F
 238         bool "Enable malloc() pool before relocation"
 239         default y if DM
 240
 241         help
 242           Before relocation, memory is very limited on many platforms. Still,
 243           we can provide a small malloc() pool if needed. Driver model in
 244           particular needs this to operate, so that it can allocate the
 245           initial serial device and any others that are needed.
 246
 247 config SYS_MALLOC_F_LEN
 248         hex "Size of malloc() pool before relocation"
 249         depends on SYS_MALLOC_F
 250         default 0x400 if M68K || PPC || ROCKCHIP_PX30 || ROCKCHIP_RK3036 || \
 251                          ROCKCHIP_RK3308 || ROCKCHIP_RV1108
 252         default 0x600 if ARCH_ZYNQMP_R5 || ARCH_ZYNQMP
 253         default 0x800 if ARCH_ZYNQ || ROCKCHIP_RK3128 || ROCKCHIP_RK3188 || \
 254                          ROCKCHIP_RK322X || X86
 255         default 0x1000 if ARCH_MESON || ARCH_BMIPS || ARCH_MTMIPS
 256         default 0x1800 if ARCH_TEGRA
 257         default 0x4000 if SANDBOX || RISCV || ARCH_APPLE || ROCKCHIP_RK3368 || \
 258                           ROCKCHIP_RK3399
 259         default 0x8000 if RCAR_GEN3
 260         default 0x10000 if ARCH_IMX8 || (ARCH_IMX8M && !IMX8MQ)
 261         default 0x2000
 262         help
 263           Before relocation, memory is very limited on many platforms. Still,
 264           we can provide a small malloc() pool if needed. Driver model in
 265           particular needs this to operate, so that it can allocate the
 266           initial serial device and any others that are needed.
 267
 268 config SYS_MALLOC_LEN
 269         hex "Define memory for Dynamic allocation"
 270         default 0x4000000 if SANDBOX
 271         default 0x2000000 if ARCH_ROCKCHIP || ARCH_OMAP2PLUS || ARCH_MESON
 272         default 0x200000 if ARCH_BMIPS || X86
 273         default 0x120000 if MACH_SUNIV
 274         default 0x220000 if MACH_SUN8I_V3S
 275         default 0x4020000 if ARCH_SUNXI
 276         default 0x400000
 277         help
 278           This defines memory to be allocated for Dynamic allocation
 279           TODO: Use for other architectures
 280
 281 config SPL_SYS_MALLOC_F_LEN
 282         hex "Size of malloc() pool in SPL"
 283         depends on SYS_MALLOC_F && SPL
 284         default 0 if !SPL_FRAMEWORK
 285         default 0x2800 if RCAR_GEN3
 286         default SYS_MALLOC_F_LEN
 287         help
 288           In SPL memory is very limited on many platforms. Still,
 289           we can provide a small malloc() pool if needed. Driver model in
 290           particular needs this to operate, so that it can allocate the
 291           initial serial device and any others that are needed.
 292
 293           It is possible to enable CONFIG_SYS_SPL_MALLOC_START to start a new
 294           malloc() region in SDRAM once it is inited.
 295
 296 config TPL_SYS_MALLOC_F_LEN
 297         hex "Size of malloc() pool in TPL"
 298         depends on SYS_MALLOC_F && TPL
 299         default SPL_SYS_MALLOC_F_LEN
 300         help
 301           In TPL memory is very limited on many platforms. Still,
 302           we can provide a small malloc() pool if needed. Driver model in
 303           particular needs this to operate, so that it can allocate the
 304           initial serial device and any others that are needed.
 305
 306 config VALGRIND
 307         bool "Inform valgrind about memory allocations"
 308         depends on !RISCV
 309         help
 310           Valgrind is an instrumentation framework for building dynamic analysis
 311           tools. In particular, it may be used to detect memory management bugs
 312           in U-Boot. It relies on knowing when heap blocks are allocated in
 313           order to give accurate results. This happens automatically for
 314           standard allocator functions provided by the host OS. However, this
 315           doesn't automatically happen for U-Boot's malloc implementation.
 316
 317           Enable this option to annotate U-Boot's malloc implementation so that
 318           it can be handled accurately by Valgrind. If you aren't planning on
 319           using valgrind to debug U-Boot, say 'n'.
 320
 321 config VPL_SYS_MALLOC_F_LEN
 322         hex "Size of malloc() pool in VPL before relocation"
 323         depends on SYS_MALLOC_F && VPL
 324         default SYS_MALLOC_F_LEN
 325         help
 326           Before relocation, memory is very limited on many platforms. Still,
 327           we can provide a small malloc() pool if needed. Driver model in
 328           particular needs this to operate, so that it can allocate the
 329           initial serial device and any others that are needed.
 330
 331 menuconfig EXPERT
 332         bool "Configure standard U-Boot features (expert users)"
 333         default y
 334         help
 335           This option allows certain base U-Boot options and settings
 336           to be disabled or tweaked. This is for specialized
 337           environments which can tolerate a "non-standard" U-Boot.
 338           Use this only if you really know what you are doing.
 339
 340 if EXPERT
 341         config SYS_MALLOC_CLEAR_ON_INIT
 342         bool "Init with zeros the memory reserved for malloc (slow)"
 343         default y
 344         help
 345           This setting is enabled by default. The reserved malloc
 346           memory is initialized with zeros, so first malloc calls
 347           will return the pointer to the zeroed memory. But this
 348           slows the boot time.
 349
 350           It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
 351           value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
 352           Then the boot time can be significantly reduced.
 353           Warning:
 354           When disabling this, please check if malloc calls, maybe
 355           should be replaced by calloc - if one expects zeroed memory.
 356
 357 config SYS_MALLOC_DEFAULT_TO_INIT
 358         bool "Default malloc to init while reserving the memory for it"
 359         help
 360           It may happen that one needs to move the dynamic allocation
 361           from one to another memory range, eg. when moving the malloc
 362           from the limited static to a potentially large dynamic (DDR)
 363           memory.
 364
 365           If so then on top of setting the updated memory aside one
 366           needs to bring the malloc init.
 367
 368           If such a scenario is sought choose yes.
 369
 370 config TOOLS_DEBUG
 371         bool "Enable debug information for tools"
 372         help
 373           Enable generation of debug information for tools such as mkimage.
 374           This can be used for debugging purposes. With debug information
 375           it is possible to set breakpoints on particular lines, single-step
 376           debug through the source code, etc.
 377
 378 endif # EXPERT
 379
 380 config PHYS_64BIT
 381         bool "64bit physical address support"
 382         help
 383           Say Y here to support 64bit physical memory address.
 384           This can be used not only for 64bit SoCs, but also for
 385           large physical address extension on 32bit SoCs.
 386
 387 config HAS_ROM
 388         bool
 389         select BINMAN
 390         help
 391           Enables building of a u-boot.rom target. This collects U-Boot and
 392           any necessary binary blobs.
 393
 394 config SPL_IMAGE
 395         string "SPL image used in the combined SPL+U-Boot image"
 396         default "spl/boot.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
 397         default "spl/u-boot-spl.bin"
 398         depends on SPL
 399         help
 400           Select the SPL build target that shall be generated by the SPL
 401           build process (default spl/u-boot-spl.bin). This image will be
 402           used to generate a combined image with SPL and main U-Boot
 403           proper as one single image.
 404
 405 config REMAKE_ELF
 406         bool "Recreate an ELF image from raw U-Boot binary"
 407         help
 408           Enable this to recreate an ELF image (u-boot.elf) from the raw
 409           U-Boot binary (u-boot.bin), which may already have been statically
 410           relocated and may already have a device-tree appended to it.
 411
 412 config BUILD_TARGET
 413         string "Build target special images"
 414         default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_ARRIA10
 415         default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_GEN5
 416         default "u-boot-spl.kwb" if ARCH_MVEBU && SPL
 417         default "u-boot-elf.srec" if RCAR_GEN3
 418         default "u-boot.itb" if !BINMAN && SPL_LOAD_FIT && (ARCH_ROCKCHIP || \
 419                                 ARCH_SUNXI || RISCV || ARCH_ZYNQMP)
 420         default "u-boot.kwb" if ARCH_KIRKWOOD
 421         default "u-boot-with-spl.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
 422         default "u-boot-with-spl.imx" if ARCH_MX6 && SPL
 423         help
 424           Some SoCs need special image types (e.g. U-Boot binary
 425           with a special header) as build targets. By defining
 426           CONFIG_BUILD_TARGET in the SoC / board header, this
 427           special image will be automatically built upon calling
 428           make / buildman.
 429
 430 config HAS_BOARD_SIZE_LIMIT
 431         bool "Define a maximum size for the U-Boot image"
 432         default y if RCAR_GEN3
 433         help
 434           In some cases, we need to enforce a hard limit on how big the U-Boot
 435           image itself can be.
 436
 437 config BOARD_SIZE_LIMIT
 438         int "Maximum size of the U-Boot image in bytes"
 439         default 1048576 if RCAR_GEN3
 440         depends on HAS_BOARD_SIZE_LIMIT
 441         help
 442           Maximum size of the U-Boot image. When defined, the build system
 443           checks that the actual size does not exceed it.  This does not
 444           include SPL nor TPL, on platforms that use that functionality, they
 445           have a separate option to restict size.
 446
 447 config SYS_CUSTOM_LDSCRIPT
 448         bool "Use a custom location for the U-Boot linker script"
 449         help
 450           Normally when linking U-Boot we will look in the board directory,
 451           the CPU directory and finally the "cpu" directory of the architecture
 452           for the ile "u-boot.lds" and use that as our linker.  However, in
 453           some cases we need to provide a different linker script.  To do so,
 454           enable this option and then provide the location under
 455           CONFIG_SYS_LDSCRIPT.
 456
 457 config SYS_LDSCRIPT
 458         depends on SYS_CUSTOM_LDSCRIPT
 459         string "Custom ldscript location"
 460         help
 461           Path within the source tree to the linker script to use for the
 462           main U-Boot binary.
 463
 464 config SYS_LOAD_ADDR
 465         hex "Address in memory to use by default"
 466         default 0x01000000 if ARCH_SOCFPGA
 467         default 0x02000000 if PPC || X86
 468         default 0x81000000 if MACH_SUNIV
 469         default 0x22000000 if MACH_SUN9I
 470         default 0x42000000 if ARCH_SUNXI
 471         default 0x82000000 if ARCH_KEYSTONE || ARCH_OMAP2PLUS || ARCH_K3
 472         default 0x82000000 if ARCH_MX6 && (MX6SL || MX6SLL  || MX6SX || MX6UL || MX6ULL)
 473         default 0x12000000 if ARCH_MX6 && !(MX6SL || MX6SLL  || MX6SX || MX6UL || MX6ULL)
 474         default 0x80800000 if ARCH_MX7
 475         default 0x90000000 if FSL_LSCH2 || FSL_LSCH3
 476         help
 477           Address in memory to use as the default safe load address.
 478
 479 config ERR_PTR_OFFSET
 480         hex
 481         default 0x0
 482         help
 483           Some U-Boot pointers have redundant information, so we can use a
 484           scheme where we can return either an error code or a pointer with the
 485           same return value. The default implementation just casts the pointer
 486           to a number, however, this may fail on platforms where the end of the
 487           address range is used for valid pointers (e.g. 0xffffff00 is a valid
 488           heap pointer in socfpga SPL).
 489           For such platforms, this value provides an upper range of those error
 490           pointer values - up to 'MAX_ERRNO' bytes below this value must be
 491           unused/invalid addresses.
 492
 493 config PLATFORM_ELFENTRY
 494         string
 495         default "__start" if MIPS
 496         default "_start"
 497
 498 config STACK_SIZE
 499         hex "Define max stack size that can be used by U-Boot"
 500         default 0x4000000 if ARCH_VERSAL || ARCH_ZYNQMP
 501         default 0x200000 if MICROBLAZE
 502         default 0x1000000
 503         help
 504           Define Max stack size that can be used by U-Boot. This value is used
 505           by the UEFI sub-system. On some boards initrd_high is calculated as
 506           base stack pointer minus this stack size.
 507
 508 config SYS_MEM_TOP_HIDE
 509         hex "Exclude some memory from U-Boot / OS information"
 510         default 0x0
 511         help
 512           If set, this specified memory area will get subtracted from the top
 513           (end) of RAM and won't get "touched" at all by U-Boot. By fixing up
 514           gd->ram_size the OS / next stage should gets passed the now
 515           "corrected" memory size and won't touch it either.
 516           WARNING: Please make sure that this value is a multiple of the OS
 517           page size.
 518
 519 config SYS_HAS_SRAM
 520         bool
 521         default y if TARGET_PIC32MZDASK
 522         default y if TARGET_DEVKIT8000
 523         default y if TARGET_TRICORDER
 524         help
 525           Enable this to allow support for the on board SRAM.
 526           SRAM base address is controlled by CONFIG_SYS_SRAM_BASE.
 527           SRAM size is controlled by CONFIG_SYS_SRAM_SIZE.
 528
 529 config SYS_SRAM_BASE
 530         hex
 531         default 0x80000000 if TARGET_PIC32MZDASK
 532         default 0x40200000 if TARGET_DEVKIT8000
 533         default 0x40200000 if TARGET_TRICORDER
 534         default 0x0
 535
 536 config SYS_SRAM_SIZE
 537         hex
 538         default 0x00080000 if TARGET_PIC32MZDASK
 539         default 0x10000 if TARGET_DEVKIT8000
 540         default 0x10000 if TARGET_TRICORDER
 541         default 0x0
 542
 543 config MP
 544         bool "Support for multiprocessor"
 545         help
 546           This provides an option to bringup different processors
 547           in multiprocessor cases.
 548
 549 config EXAMPLES
 550         bool "Compile API examples"
 551         depends on !SANDBOX
 552         default y if ARCH_QEMU
 553         help
 554           U-Boot provides an API for standalone applications. Examples are
 555           provided in directory examples/.
 556
 557 endmenu         # General setup
 558
 559 source "api/Kconfig"
 560
 561 source "boot/Kconfig"
 562
 563 source "common/Kconfig"
 564
 565 source "cmd/Kconfig"
 566
 567 source "disk/Kconfig"
 568
 569 source "dts/Kconfig"
 570
 571 source "env/Kconfig"
 572
 573 source "net/Kconfig"
 574
 575 source "drivers/Kconfig"
 576
 577 source "fs/Kconfig"
 578
 579 source "lib/Kconfig"
 580
 581 source "test/Kconfig"
 582
 583 source "tools/Kconfig"