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.
6 mainmenu "U-Boot $(UBOOTVERSION) Configuration"
8 comment "Compiler: $(CC_VERSION_TEXT)"
10 source "scripts/Kconfig.include"
12 # Allow defaults in arch-specific code to override any given here
20 This option cannot be enabled. It is used as dependency
21 for broken and incomplete features.
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.
31 string "Local version - append to U-Boot release"
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.
40 config LOCALVERSION_AUTO
41 bool "Automatically append version information to the version string"
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
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.
53 (The actual string used here is the first eight characters produced
54 by running the command:
56 $ git rev-parse --verify HEAD
58 which is done within the script "scripts/setlocalversion".)
61 def_bool $(success,$(CC) --version | head -n 1 | grep -q gcc)
65 default $(shell,$(srctree)/scripts/gcc-version.sh -p $(CC) | sed 's/^0*//') if CC_IS_GCC
69 def_bool $(success,$(CC) --version | head -n 1 | grep -q clang)
73 default $(shell,$(srctree)/scripts/clang-version.sh $(CC))
76 prompt "Optimization level"
77 default CC_OPTIMIZE_FOR_SIZE
79 config CC_OPTIMIZE_FOR_SIZE
80 bool "Optimize for size"
82 Enabling this option will pass "-Os" to gcc, resulting in a smaller
85 This option is enabled by default for U-Boot.
87 config CC_OPTIMIZE_FOR_SPEED
88 bool "Optimize for speed"
90 Enabling this option will pass "-O2" to gcc, resulting in a faster
93 config CC_OPTIMIZE_FOR_DEBUG
94 bool "Optimize for debugging"
96 Enabling this option will pass "-Og" to gcc, enabling optimizations
97 which don't interfere with debugging.
101 config OPTIMIZE_INLINING
102 bool "Allow compiler to uninline functions marked 'inline' in full U-Boot"
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
109 config SPL_OPTIMIZE_INLINING
110 bool "Allow compiler to uninline functions marked 'inline' in SPL"
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
118 config ARCH_SUPPORTS_LTO
122 bool "Enable Link Time Optimizations"
123 depends on ARCH_SUPPORTS_LTO
125 This option enables Link Time Optimization (LTO), a mechanism which
126 allows the compiler to optimize between different compilation units.
128 This can optimize away dead code paths, resulting in smaller binary
129 size (if CC_OPTIMIZE_FOR_SIZE is enabled).
131 This option is not available for every architecture and may
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
141 config TPL_OPTIMIZE_INLINING
142 bool "Allow compiler to uninline functions marked 'inline' in TPL"
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
151 bool "Enable code coverage analysis"
154 Enabling this option will pass "--coverage" to gcc to compile
155 and link code instrumented for coverage analysis.
158 bool "Enable AddressSanitizer"
161 Enables AddressSanitizer to discover out-of-bounds accesses,
162 use-after-free, double-free and memory leaks.
165 bool "Enable fuzzing"
166 depends on CC_IS_CLANG
167 depends on DM_FUZZING_ENGINE
170 Enables the fuzzing infrastructure to generate fuzzing data and run
173 config CC_HAS_ASM_INLINE
174 def_bool $(success,echo 'void foo(void) { asm inline (""); }' | $(CC) -x c - -c -o /dev/null)
177 bool "Select U-Boot be run as a bootloader for XEN Virtual Machine"
181 Enabling this option will make U-Boot be run as a bootloader
182 for XEN [1] Virtual Machine.
184 Xen is a virtual machine monitor (VMM) or a type-1 hypervisor with support
185 for para-virtualization. Xen can organize the safe execution of several
186 virtual machines on the same physical system with performance close to
187 native. It is used as the basis for a number of different commercial and
188 open source applications, such as: server virtualization, Infrastructure
189 as a Service (IaaS), desktop virtualization, security applications,
190 embedded and hardware appliances.
191 Xen has a special VM called Domain-0 that runs the Dom0 kernel and allows
192 Xen to use the device drivers for the Domain-0 kernel by default.
194 [1] - https://xenproject.org/
196 config ENV_VARS_UBOOT_CONFIG
197 bool "Add arch, board, vendor and soc variables to default environment"
199 Define this in order to add variables describing the
200 U-Boot build configuration to the default environment.
201 These will be named arch, cpu, board, vendor, and soc.
202 Enabling this option will cause the following to be defined:
210 int "Number of DRAM banks"
211 default 1 if ARCH_SUNXI || ARCH_OWL
214 This defines the number of DRAM banks.
216 config SYS_BOOT_GET_CMDLINE
217 bool "Enable kernel command line setup"
219 Enables allocating and saving kernel cmdline in space between
220 "bootm_low" and "bootm_low" + BOOTMAPSZ.
223 int "Size of kernel command line buffer in bytes"
224 depends on SYS_BOOT_GET_CMDLINE
227 Buffer size for Boot Arguments which are passed to the application
228 (usually a Linux kernel) when it is booted
230 config SYS_BOOT_GET_KBD
231 bool "Enable kernel board information setup"
233 Enables allocating and saving a kernel copy of the bd_info in
234 space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
236 config HAS_CUSTOM_SYS_INIT_SP_ADDR
237 bool "Use a custom location for the initial stack pointer address"
238 depends on ARC || (ARM && !INIT_SP_RELATIVE) || MIPS || PPC || RISCV
241 Typically, we use an initial stack pointer address that is calculated
242 by taking the statically defined CFG_SYS_INIT_RAM_ADDR, adding the
243 statically defined CFG_SYS_INIT_RAM_SIZE and then subtracting the
244 build-time constant of GENERATED_GBL_DATA_SIZE. On MIPS a different
245 but statica calculation is performed. However, some platforms will
246 take a different approach. Say Y here to define the address statically
249 config CUSTOM_SYS_INIT_SP_ADDR
250 hex "Static location for the initial stack pointer"
251 depends on HAS_CUSTOM_SYS_INIT_SP_ADDR
252 default TEXT_BASE if TFABOOT
255 bool "Enable malloc() pool before relocation"
259 Before relocation, memory is very limited on many platforms. Still,
260 we can provide a small malloc() pool if needed. Driver model in
261 particular needs this to operate, so that it can allocate the
262 initial serial device and any others that are needed.
264 config SYS_MALLOC_F_LEN
265 hex "Size of malloc() pool before relocation"
266 depends on SYS_MALLOC_F
267 default 0x400 if M68K || PPC || ROCKCHIP_PX30 || ROCKCHIP_RK3036 || \
269 default 0x600 if ARCH_ZYNQMP_R5 || ARCH_ZYNQMP
270 default 0x800 if ARCH_ZYNQ || ROCKCHIP_RK3128 || ROCKCHIP_RK3188 || \
271 ROCKCHIP_RK322X || X86
272 default 0x1000 if ARCH_MESON || ARCH_BMIPS || ARCH_MTMIPS
273 default 0x1800 if ARCH_TEGRA
274 default 0x4000 if SANDBOX || RISCV || ARCH_APPLE || ROCKCHIP_RK3368 || \
276 default 0x8000 if RCAR_GEN3
277 default 0x10000 if ARCH_IMX8 || ARCH_IMX8M
280 Size of the malloc() pool for use before relocation. If
281 this is defined, then a very simple malloc() implementation
282 will become available before relocation. The address is just
283 below the global data, and the stack is moved down to make
286 This feature allocates regions with increasing addresses
287 within the region. calloc() is supported, but realloc()
288 is not available. free() is supported but does nothing.
289 The memory will be freed (or in fact just forgotten) when
290 U-Boot relocates itself.
292 config SYS_MALLOC_LEN
293 hex "Define memory for Dynamic allocation"
294 default 0x4000000 if SANDBOX
295 default 0x2000000 if ARCH_ROCKCHIP || ARCH_OMAP2PLUS || ARCH_MESON
296 default 0x200000 if ARCH_BMIPS || X86
297 default 0x4020000 if SUNXI_MINIMUM_DRAM_MB >= 256
298 default 0x220000 if SUNXI_MINIMUM_DRAM_MB >= 64
299 default 0x120000 if SUNXI_MINIMUM_DRAM_MB >= 32
302 This defines memory to be allocated for Dynamic allocation
303 TODO: Use for other architectures
305 config SPL_SYS_MALLOC_F
306 bool "Enable malloc() pool in SPL"
307 depends on SPL_FRAMEWORK && SYS_MALLOC_F && SPL
310 In SPL memory is very limited on many platforms. Still,
311 we can provide a small malloc() pool if needed. Driver model in
312 particular needs this to operate, so that it can allocate the
313 initial serial device and any others that are needed.
315 config SPL_SYS_MALLOC_F_LEN
316 hex "Size of malloc() pool in SPL"
317 depends on SPL_SYS_MALLOC_F
318 default 0x2800 if RCAR_GEN3
319 default 0x2000 if IMX8MQ
320 default SYS_MALLOC_F_LEN
322 Sets the size of the malloc() pool in SPL. This is used for
323 driver model and other features, which must allocate memory for
326 It is possible to enable CFG_SPL_SYS_MALLOC_START to start a new
327 malloc() region in SDRAM once it is inited.
329 config TPL_SYS_MALLOC_F
330 bool "Enable malloc() pool in TPL"
331 depends on SYS_MALLOC_F && TPL
332 default y if SPL_SYS_MALLOC_F
334 In TPL memory is very limited on many platforms. Still,
335 we can provide a small malloc() pool if needed. Driver model in
336 particular needs this to operate, so that it can allocate the
337 initial serial device and any others that are needed.
339 config TPL_SYS_MALLOC_F_LEN
340 hex "Size of malloc() pool in TPL"
341 depends on TPL_SYS_MALLOC_F
342 default SPL_SYS_MALLOC_F_LEN
344 Sets the size of the malloc() pool in TPL. This is used for
345 driver model and other features, which must allocate memory for
349 bool "Inform valgrind about memory allocations"
352 Valgrind is an instrumentation framework for building dynamic analysis
353 tools. In particular, it may be used to detect memory management bugs
354 in U-Boot. It relies on knowing when heap blocks are allocated in
355 order to give accurate results. This happens automatically for
356 standard allocator functions provided by the host OS. However, this
357 doesn't automatically happen for U-Boot's malloc implementation.
359 Enable this option to annotate U-Boot's malloc implementation so that
360 it can be handled accurately by Valgrind. If you aren't planning on
361 using valgrind to debug U-Boot, say 'n'.
363 config VPL_SYS_MALLOC_F
364 bool "Enable malloc() pool in VPL"
365 depends on SYS_MALLOC_F && VPL
366 default y if SPL_SYS_MALLOC_F
368 In VPL memory is very limited on many platforms. Still,
369 we can provide a small malloc() pool if needed. Driver model in
370 particular needs this to operate, so that it can allocate the
371 initial serial device and any others that are needed.
373 config VPL_SYS_MALLOC_F_LEN
374 hex "Size of malloc() pool in VPL before relocation"
375 depends on VPL_SYS_MALLOC_F
376 default SPL_SYS_MALLOC_F_LEN
378 Sets the size of the malloc() pool in VPL. This is used for
379 driver model and other features, which must allocate memory for
383 bool "Configure standard U-Boot features (expert users)"
386 This option allows certain base U-Boot options and settings
387 to be disabled or tweaked. This is for specialized
388 environments which can tolerate a "non-standard" U-Boot.
389 Use this only if you really know what you are doing.
392 config SYS_MALLOC_CLEAR_ON_INIT
393 bool "Init with zeros the memory reserved for malloc (slow)"
396 This setting is enabled by default. The reserved malloc
397 memory is initialized with zeros, so first malloc calls
398 will return the pointer to the zeroed memory. But this
401 It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
402 value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
403 Then the boot time can be significantly reduced.
405 When disabling this, please check if malloc calls, maybe
406 should be replaced by calloc - if one expects zeroed memory.
408 config SPL_SYS_MALLOC_CLEAR_ON_INIT
409 bool "Init with zeros the memory reserved for malloc (slow) in SPL"
411 default SYS_MALLOC_CLEAR_ON_INIT
413 Same as SYS_MALLOC_CLEAR_ON_INIT, but for SPL. It's possible to
414 Enable it without SYS_MALLOC_CLEAR_ON_INIT. It's useful for boards
415 that must have particular memory regions zero'ed before first use.
416 If SYS_SPL_MALLOC_START is configured to be in such region, this
417 option should be enabled.
419 config SYS_MALLOC_DEFAULT_TO_INIT
420 bool "Default malloc to init while reserving the memory for it"
422 It may happen that one needs to move the dynamic allocation
423 from one to another memory range, eg. when moving the malloc
424 from the limited static to a potentially large dynamic (DDR)
427 If so then on top of setting the updated memory aside one
428 needs to bring the malloc init.
430 If such a scenario is sought choose yes.
433 bool "Enable debug information for tools"
435 Enable generation of debug information for tools such as mkimage.
436 This can be used for debugging purposes. With debug information
437 it is possible to set breakpoints on particular lines, single-step
438 debug through the source code, etc.
443 bool "64bit physical address support"
446 Say Y here to support 64bit physical memory address.
447 This can be used not only for 64bit SoCs, but also for
448 large physical address extension on 32bit SoCs.
451 bool "64bit fdt address support"
453 Say Y here to support 64bit fdt addresses.
454 This can be used not only for 64bit SoCs, but also
455 for large address extensions on 32bit SoCs.
461 Enables building of a u-boot.rom target. This collects U-Boot and
462 any necessary binary blobs.
465 string "SPL image used in the combined SPL+U-Boot image"
466 default "spl/boot.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
467 default "spl/u-boot-spl.bin"
470 Select the SPL build target that shall be generated by the SPL
471 build process (default spl/u-boot-spl.bin). This image will be
472 used to generate a combined image with SPL and main U-Boot
473 proper as one single image.
476 bool "Recreate an ELF image from raw U-Boot binary"
478 Enable this to recreate an ELF image (u-boot.elf) from the raw
479 U-Boot binary (u-boot.bin), which may already have been statically
480 relocated and may already have a device-tree appended to it.
483 string "Build target special images"
484 default "u-boot-elf.srec" if RCAR_64
485 default "u-boot-with-spl.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
486 default "u-boot-with-spl.bin" if MPC85xx && !E500MC && !E5500 && !E6500 && SPL
487 default "u-boot-with-spl.imx" if ARCH_MX6 && SPL
488 default "u-boot-with-spl.kwb" if ARMADA_32BIT && SPL
489 default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_ARRIA10
490 default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_GEN5
491 default "u-boot.itb" if !BINMAN && SPL_LOAD_FIT && (ARCH_ROCKCHIP || \
492 RISCV || ARCH_ZYNQMP)
493 default "u-boot.kwb" if (ARCH_KIRKWOOD || ARMADA_32BIT) && !SPL
495 Some SoCs need special image types (e.g. U-Boot binary
496 with a special header) as build targets. By defining
497 CONFIG_BUILD_TARGET in the SoC / board header, this
498 special image will be automatically built upon calling
501 config HAS_BOARD_SIZE_LIMIT
502 bool "Define a maximum size for the U-Boot image"
503 default y if RCAR_32 || RCAR_64
505 In some cases, we need to enforce a hard limit on how big the U-Boot
508 config BOARD_SIZE_LIMIT
509 int "Maximum size of the U-Boot image in bytes"
510 default 524288 if RCAR_32
511 default 1048576 if RCAR_64
512 depends on HAS_BOARD_SIZE_LIMIT
514 Maximum size of the U-Boot image. When defined, the build system
515 checks that the actual size does not exceed it. This does not
516 include SPL nor TPL, on platforms that use that functionality, they
517 have a separate option to restict size.
519 config SYS_CUSTOM_LDSCRIPT
520 bool "Use a custom location for the U-Boot linker script"
522 Normally when linking U-Boot we will look in the board directory,
523 the CPU directory and finally the "cpu" directory of the architecture
524 for the ile "u-boot.lds" and use that as our linker. However, in
525 some cases we need to provide a different linker script. To do so,
526 enable this option and then provide the location under
530 depends on SYS_CUSTOM_LDSCRIPT
531 string "Custom ldscript location"
533 Path within the source tree to the linker script to use for the
537 hex "Address in memory to use by default"
538 default 0x01000000 if ARCH_SOCFPGA
539 default 0x02000000 if PPC || X86
540 default 0x81000000 if MACH_SUNIV
541 default 0x22000000 if MACH_SUN9I
542 default 0x42000000 if ARCH_SUNXI
543 default 0x82000000 if ARCH_KEYSTONE || ARCH_OMAP2PLUS || ARCH_K3
544 default 0x82000000 if ARCH_MX6 && (MX6SL || MX6SLL || MX6SX || MX6UL || MX6ULL)
545 default 0x12000000 if ARCH_MX6 && !(MX6SL || MX6SLL || MX6SX || MX6UL || MX6ULL)
546 default 0x80800000 if ARCH_MX7
547 default 0x90000000 if FSL_LSCH2 || FSL_LSCH3
549 Address in memory to use as the default safe load address.
551 config ERR_PTR_OFFSET
555 Some U-Boot pointers have redundant information, so we can use a
556 scheme where we can return either an error code or a pointer with the
557 same return value. The default implementation just casts the pointer
558 to a number, however, this may fail on platforms where the end of the
559 address range is used for valid pointers (e.g. 0xffffff00 is a valid
560 heap pointer in socfpga SPL).
561 For such platforms, this value provides an upper range of those error
562 pointer values - up to 'MAX_ERRNO' bytes below this value must be
563 unused/invalid addresses.
565 config PLATFORM_ELFENTRY
567 default "__start" if MIPS
571 hex "Define max stack size that can be used by U-Boot"
572 default 0x4000000 if ARCH_VERSAL_NET || ARCH_VERSAL || ARCH_ZYNQMP
573 default 0x200000 if MICROBLAZE
576 Define Max stack size that can be used by U-Boot. This value is used
577 by the UEFI sub-system. On some boards initrd_high is calculated as
578 base stack pointer minus this stack size.
580 config SYS_MEM_TOP_HIDE
581 hex "Exclude some memory from U-Boot / OS information"
584 If set, this specified memory area will get subtracted from the top
585 (end) of RAM and won't get "touched" at all by U-Boot. By fixing up
586 gd->ram_size the OS / next stage should gets passed the now
587 "corrected" memory size and won't touch it either.
588 WARNING: Please make sure that this value is a multiple of the OS
593 default y if TARGET_PIC32MZDASK
594 default y if TARGET_DEVKIT8000
595 default y if TARGET_TRICORDER
597 Enable this to allow support for the on board SRAM.
598 SRAM base address is controlled by CONFIG_SYS_SRAM_BASE.
599 SRAM size is controlled by CONFIG_SYS_SRAM_SIZE.
603 default 0x80000000 if TARGET_PIC32MZDASK
604 default 0x40200000 if TARGET_DEVKIT8000
605 default 0x40200000 if TARGET_TRICORDER
610 default 0x00080000 if TARGET_PIC32MZDASK
611 default 0x10000 if TARGET_DEVKIT8000
612 default 0x10000 if TARGET_TRICORDER
615 config SYS_MONITOR_LEN
616 int "Maximum size in bytes reserved for U-Boot in memory"
617 default 1048576 if X86
618 default 786432 if ARCH_SUNXI
621 Size of memory reserved for monitor code, used to determine
622 _at_compile_time_ (!) if the environment is embedded within the
623 U-Boot image, or in a separate flash sector, among other uses where
624 we need to set a maximum size of the U-Boot binary itself that will
628 bool "Support for multiprocessor"
630 This provides an option to bringup different processors
631 in multiprocessor cases.
633 config HAVE_TEXT_BASE
635 depends on !NIOS2 && !XTENSA
640 depends on HAVE_TEXT_BASE
641 default 0x0 if POSITION_INDEPENDENT
642 default 0x80800000 if ARCH_OMAP2PLUS || ARCH_K3
643 default 0x81700000 if MACH_SUNIV
644 default 0x2a000000 if MACH_SUN9I
645 default 0x4a000000 if SUNXI_MINIMUM_DRAM_MB >= 256
646 default 0x42e00000 if SUNXI_MINIMUM_DRAM_MB >= 64
649 The address in memory that U-Boot will be copied and executed from
652 config HAVE_SYS_UBOOT_START
653 bool "Use custom U-Boot Start"
654 depends on HAVE_TEXT_BASE
656 By default, the address in memory that U-Boot will be copied from
657 (TEXT_BASE) and the entry point are the same. Select this to start the
658 execution of U-Boot from a different address.
659 This may be required if a header or vector table needs to be copied
662 config SYS_UBOOT_START
664 depends on HAVE_TEXT_BASE
666 prompt "U-Boot entry" if HAVE_SYS_UBOOT_START
668 If TEXT_BASE differs from the start of execution, this sets the
669 address in memory that U-Boot will start execution from initially.
671 config HAVE_SYS_MONITOR_BASE
673 depends on ARC || MIPS || M68K || NIOS2 || PPC || XTENSA || X86 \
674 || ENV_IS_IN_FLASH || MTD_NOR_FLASH
678 config SYS_MONITOR_BASE
679 depends on HAVE_SYS_MONITOR_BASE
680 hex "Physical start address of boot monitor code"
683 The physical start address of boot monitor code (which is the same as
684 CONFIG_TEXT_BASE when linking) and the same as CFG_SYS_FLASH_BASE
685 when booting from flash.
687 config SPL_SYS_MONITOR_BASE
688 depends on MPC85xx && SPL && HAVE_SYS_MONITOR_BASE
689 hex "Physical start address of SPL monitor code"
690 default SPL_TEXT_BASE
692 config TPL_SYS_MONITOR_BASE
693 depends on MPC85xx && TPL && HAVE_SYS_MONITOR_BASE
694 hex "Physical start address of TPL monitor code"
696 config DYNAMIC_SYS_CLK_FREQ
697 bool "Determine CPU clock frequency at run-time"
699 Implement a get_board_sys_clk function that will determine the CPU
700 clock frequency at run time, rather than define it statically.
703 depends on !DYNAMIC_SYS_CLK_FREQ
704 int "CPU clock frequency"
705 default 125000000 if ARCH_LS1012A
706 default 100000000 if ARCH_P2020 || ARCH_T1024 || ARCH_T1042 || \
707 ARCH_LS1021A || FSL_LSCH2 || FSL_LSCH3
708 default 66666666 if ARCH_P1010 || ARCH_P1020 || ARCH_T4240
709 default 66660000 if ARCH_T2080
710 default 33333333 if RCAR_GEN3
711 default 24000000 if ARCH_EXYNOS
712 default 20000000 if RCAR_GEN2
715 A static value for the CPU frequency. Note that if not required
716 for a given SoC, this can be left at 0.
720 endmenu # General setup
722 source "boot/Kconfig"
724 source "common/Kconfig"
728 source "disk/Kconfig"
736 source "drivers/Kconfig"
742 source "test/Kconfig"
744 source "tools/Kconfig"