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 || \
268 ROCKCHIP_RK3308 || ROCKCHIP_RV1108
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 Before relocation, memory is very limited on many platforms. Still,
281 we can provide a small malloc() pool if needed. Driver model in
282 particular needs this to operate, so that it can allocate the
283 initial serial device and any others that are needed.
285 config SYS_MALLOC_LEN
286 hex "Define memory for Dynamic allocation"
287 default 0x4000000 if SANDBOX
288 default 0x2000000 if ARCH_ROCKCHIP || ARCH_OMAP2PLUS || ARCH_MESON
289 default 0x200000 if ARCH_BMIPS || X86
290 default 0x4020000 if SUNXI_MINIMUM_DRAM_MB >= 256
291 default 0x220000 if SUNXI_MINIMUM_DRAM_MB >= 64
292 default 0x120000 if SUNXI_MINIMUM_DRAM_MB >= 32
295 This defines memory to be allocated for Dynamic allocation
296 TODO: Use for other architectures
298 config SPL_SYS_MALLOC_F
299 bool "Enable malloc() pool in SPL"
300 depends on SPL_FRAMEWORK && SYS_MALLOC_F && SPL
303 In SPL memory is very limited on many platforms. Still,
304 we can provide a small malloc() pool if needed. Driver model in
305 particular needs this to operate, so that it can allocate the
306 initial serial device and any others that are needed.
308 config SPL_SYS_MALLOC_F_LEN
309 hex "Size of malloc() pool in SPL"
310 depends on SYS_MALLOC_F && SPL
311 default 0x0 if !SPL_FRAMEWORK
312 default 0x2800 if RCAR_GEN3
313 default 0x2000 if IMX8MQ
314 default SYS_MALLOC_F_LEN
316 Sets the size of the malloc() pool in SPL. This is used for
317 driver model and other features, which must allocate memory for
320 It is possible to enable CFG_SPL_SYS_MALLOC_START to start a new
321 malloc() region in SDRAM once it is inited.
323 config TPL_SYS_MALLOC_F
324 bool "Enable malloc() pool in SPL"
325 depends on SYS_MALLOC_F && TPL
326 default y if SPL_SYS_MALLOC_F
328 In TPL memory is very limited on many platforms. Still,
329 we can provide a small malloc() pool if needed. Driver model in
330 particular needs this to operate, so that it can allocate the
331 initial serial device and any others that are needed.
333 config TPL_SYS_MALLOC_F_LEN
334 hex "Size of malloc() pool in TPL"
335 depends on SYS_MALLOC_F && TPL
336 default SPL_SYS_MALLOC_F_LEN
338 Sets the size of the malloc() pool in TPL. This is used for
339 driver model and other features, which must allocate memory for
343 bool "Inform valgrind about memory allocations"
346 Valgrind is an instrumentation framework for building dynamic analysis
347 tools. In particular, it may be used to detect memory management bugs
348 in U-Boot. It relies on knowing when heap blocks are allocated in
349 order to give accurate results. This happens automatically for
350 standard allocator functions provided by the host OS. However, this
351 doesn't automatically happen for U-Boot's malloc implementation.
353 Enable this option to annotate U-Boot's malloc implementation so that
354 it can be handled accurately by Valgrind. If you aren't planning on
355 using valgrind to debug U-Boot, say 'n'.
357 config VPL_SYS_MALLOC_F
358 bool "Enable malloc() pool in VPL"
359 depends on SYS_MALLOC_F && VPL
360 default y if SPL_SYS_MALLOC_F
362 In VPL memory is very limited on many platforms. Still,
363 we can provide a small malloc() pool if needed. Driver model in
364 particular needs this to operate, so that it can allocate the
365 initial serial device and any others that are needed.
367 config VPL_SYS_MALLOC_F_LEN
368 hex "Size of malloc() pool in VPL before relocation"
369 depends on SYS_MALLOC_F && VPL
370 default SYS_MALLOC_F_LEN
372 Sets the size of the malloc() pool in VPL. This is used for
373 driver model and other features, which must allocate memory for
377 bool "Configure standard U-Boot features (expert users)"
380 This option allows certain base U-Boot options and settings
381 to be disabled or tweaked. This is for specialized
382 environments which can tolerate a "non-standard" U-Boot.
383 Use this only if you really know what you are doing.
386 config SYS_MALLOC_CLEAR_ON_INIT
387 bool "Init with zeros the memory reserved for malloc (slow)"
390 This setting is enabled by default. The reserved malloc
391 memory is initialized with zeros, so first malloc calls
392 will return the pointer to the zeroed memory. But this
395 It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
396 value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
397 Then the boot time can be significantly reduced.
399 When disabling this, please check if malloc calls, maybe
400 should be replaced by calloc - if one expects zeroed memory.
402 config SPL_SYS_MALLOC_CLEAR_ON_INIT
403 bool "Init with zeros the memory reserved for malloc (slow) in SPL"
405 default SYS_MALLOC_CLEAR_ON_INIT
407 Same as SYS_MALLOC_CLEAR_ON_INIT, but for SPL. It's possible to
408 Enable it without SYS_MALLOC_CLEAR_ON_INIT. It's useful for boards
409 that must have particular memory regions zero'ed before first use.
410 If SYS_SPL_MALLOC_START is configured to be in such region, this
411 option should be enabled.
413 config SYS_MALLOC_DEFAULT_TO_INIT
414 bool "Default malloc to init while reserving the memory for it"
416 It may happen that one needs to move the dynamic allocation
417 from one to another memory range, eg. when moving the malloc
418 from the limited static to a potentially large dynamic (DDR)
421 If so then on top of setting the updated memory aside one
422 needs to bring the malloc init.
424 If such a scenario is sought choose yes.
427 bool "Enable debug information for tools"
429 Enable generation of debug information for tools such as mkimage.
430 This can be used for debugging purposes. With debug information
431 it is possible to set breakpoints on particular lines, single-step
432 debug through the source code, etc.
437 bool "64bit physical address support"
440 Say Y here to support 64bit physical memory address.
441 This can be used not only for 64bit SoCs, but also for
442 large physical address extension on 32bit SoCs.
445 bool "64bit fdt address support"
447 Say Y here to support 64bit fdt addresses.
448 This can be used not only for 64bit SoCs, but also
449 for large address extensions on 32bit SoCs.
455 Enables building of a u-boot.rom target. This collects U-Boot and
456 any necessary binary blobs.
459 string "SPL image used in the combined SPL+U-Boot image"
460 default "spl/boot.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
461 default "spl/u-boot-spl.bin"
464 Select the SPL build target that shall be generated by the SPL
465 build process (default spl/u-boot-spl.bin). This image will be
466 used to generate a combined image with SPL and main U-Boot
467 proper as one single image.
470 bool "Recreate an ELF image from raw U-Boot binary"
472 Enable this to recreate an ELF image (u-boot.elf) from the raw
473 U-Boot binary (u-boot.bin), which may already have been statically
474 relocated and may already have a device-tree appended to it.
477 string "Build target special images"
478 default "u-boot-elf.srec" if RCAR_64
479 default "u-boot-with-spl.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
480 default "u-boot-with-spl.bin" if MPC85xx && !E500MC && !E5500 && !E6500 && SPL
481 default "u-boot-with-spl.imx" if ARCH_MX6 && SPL
482 default "u-boot-with-spl.kwb" if ARMADA_32BIT && SPL
483 default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_ARRIA10
484 default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_GEN5
485 default "u-boot.itb" if !BINMAN && SPL_LOAD_FIT && (ARCH_ROCKCHIP || \
486 RISCV || ARCH_ZYNQMP)
487 default "u-boot.kwb" if (ARCH_KIRKWOOD || ARMADA_32BIT) && !SPL
489 Some SoCs need special image types (e.g. U-Boot binary
490 with a special header) as build targets. By defining
491 CONFIG_BUILD_TARGET in the SoC / board header, this
492 special image will be automatically built upon calling
495 config HAS_BOARD_SIZE_LIMIT
496 bool "Define a maximum size for the U-Boot image"
499 In some cases, we need to enforce a hard limit on how big the U-Boot
502 config BOARD_SIZE_LIMIT
503 int "Maximum size of the U-Boot image in bytes"
504 default 1048576 if RCAR_64
505 depends on HAS_BOARD_SIZE_LIMIT
507 Maximum size of the U-Boot image. When defined, the build system
508 checks that the actual size does not exceed it. This does not
509 include SPL nor TPL, on platforms that use that functionality, they
510 have a separate option to restict size.
512 config SYS_CUSTOM_LDSCRIPT
513 bool "Use a custom location for the U-Boot linker script"
515 Normally when linking U-Boot we will look in the board directory,
516 the CPU directory and finally the "cpu" directory of the architecture
517 for the ile "u-boot.lds" and use that as our linker. However, in
518 some cases we need to provide a different linker script. To do so,
519 enable this option and then provide the location under
523 depends on SYS_CUSTOM_LDSCRIPT
524 string "Custom ldscript location"
526 Path within the source tree to the linker script to use for the
530 hex "Address in memory to use by default"
531 default 0x01000000 if ARCH_SOCFPGA
532 default 0x02000000 if PPC || X86
533 default 0x81000000 if MACH_SUNIV
534 default 0x22000000 if MACH_SUN9I
535 default 0x42000000 if ARCH_SUNXI
536 default 0x82000000 if ARCH_KEYSTONE || ARCH_OMAP2PLUS || ARCH_K3
537 default 0x82000000 if ARCH_MX6 && (MX6SL || MX6SLL || MX6SX || MX6UL || MX6ULL)
538 default 0x12000000 if ARCH_MX6 && !(MX6SL || MX6SLL || MX6SX || MX6UL || MX6ULL)
539 default 0x80800000 if ARCH_MX7
540 default 0x90000000 if FSL_LSCH2 || FSL_LSCH3
542 Address in memory to use as the default safe load address.
544 config ERR_PTR_OFFSET
548 Some U-Boot pointers have redundant information, so we can use a
549 scheme where we can return either an error code or a pointer with the
550 same return value. The default implementation just casts the pointer
551 to a number, however, this may fail on platforms where the end of the
552 address range is used for valid pointers (e.g. 0xffffff00 is a valid
553 heap pointer in socfpga SPL).
554 For such platforms, this value provides an upper range of those error
555 pointer values - up to 'MAX_ERRNO' bytes below this value must be
556 unused/invalid addresses.
558 config PLATFORM_ELFENTRY
560 default "__start" if MIPS
564 hex "Define max stack size that can be used by U-Boot"
565 default 0x4000000 if ARCH_VERSAL_NET || ARCH_VERSAL || ARCH_ZYNQMP
566 default 0x200000 if MICROBLAZE
569 Define Max stack size that can be used by U-Boot. This value is used
570 by the UEFI sub-system. On some boards initrd_high is calculated as
571 base stack pointer minus this stack size.
573 config SYS_MEM_TOP_HIDE
574 hex "Exclude some memory from U-Boot / OS information"
577 If set, this specified memory area will get subtracted from the top
578 (end) of RAM and won't get "touched" at all by U-Boot. By fixing up
579 gd->ram_size the OS / next stage should gets passed the now
580 "corrected" memory size and won't touch it either.
581 WARNING: Please make sure that this value is a multiple of the OS
586 default y if TARGET_PIC32MZDASK
587 default y if TARGET_DEVKIT8000
588 default y if TARGET_TRICORDER
590 Enable this to allow support for the on board SRAM.
591 SRAM base address is controlled by CONFIG_SYS_SRAM_BASE.
592 SRAM size is controlled by CONFIG_SYS_SRAM_SIZE.
596 default 0x80000000 if TARGET_PIC32MZDASK
597 default 0x40200000 if TARGET_DEVKIT8000
598 default 0x40200000 if TARGET_TRICORDER
603 default 0x00080000 if TARGET_PIC32MZDASK
604 default 0x10000 if TARGET_DEVKIT8000
605 default 0x10000 if TARGET_TRICORDER
608 config SYS_MONITOR_LEN
609 int "Maximum size in bytes reserved for U-Boot in memory"
610 default 1048576 if X86
611 default 786432 if ARCH_SUNXI
614 Size of memory reserved for monitor code, used to determine
615 _at_compile_time_ (!) if the environment is embedded within the
616 U-Boot image, or in a separate flash sector, among other uses where
617 we need to set a maximum size of the U-Boot binary itself that will
621 bool "Support for multiprocessor"
623 This provides an option to bringup different processors
624 in multiprocessor cases.
626 config HAVE_TEXT_BASE
628 depends on !NIOS2 && !XTENSA
633 depends on HAVE_TEXT_BASE
634 default 0x0 if POSITION_INDEPENDENT
635 default 0x80800000 if ARCH_OMAP2PLUS || ARCH_K3
636 default 0x81700000 if MACH_SUNIV
637 default 0x2a000000 if MACH_SUN9I
638 default 0x4a000000 if SUNXI_MINIMUM_DRAM_MB >= 256
639 default 0x42e00000 if SUNXI_MINIMUM_DRAM_MB >= 64
642 The address in memory that U-Boot will be copied and executed from
645 config HAVE_SYS_UBOOT_START
646 bool "Use custom U-Boot Start"
647 depends on HAVE_TEXT_BASE
649 By default, the address in memory that U-Boot will be copied from
650 (TEXT_BASE) and the entry point are the same. Select this to start the
651 execution of U-Boot from a different address.
652 This may be required if a header or vector table needs to be copied
655 config SYS_UBOOT_START
657 depends on HAVE_TEXT_BASE
659 prompt "U-Boot entry" if HAVE_SYS_UBOOT_START
661 If TEXT_BASE differs from the start of execution, this sets the
662 address in memory that U-Boot will start execution from initially.
664 config HAVE_SYS_MONITOR_BASE
666 depends on ARC || MIPS || M68K || NIOS2 || PPC || XTENSA || X86 \
667 || ENV_IS_IN_FLASH || MTD_NOR_FLASH
671 config SYS_MONITOR_BASE
672 depends on HAVE_SYS_MONITOR_BASE
673 hex "Physical start address of boot monitor code"
676 The physical start address of boot monitor code (which is the same as
677 CONFIG_TEXT_BASE when linking) and the same as CFG_SYS_FLASH_BASE
678 when booting from flash.
680 config SPL_SYS_MONITOR_BASE
681 depends on MPC85xx && SPL && HAVE_SYS_MONITOR_BASE
682 hex "Physical start address of SPL monitor code"
683 default SPL_TEXT_BASE
685 config TPL_SYS_MONITOR_BASE
686 depends on MPC85xx && TPL && HAVE_SYS_MONITOR_BASE
687 hex "Physical start address of TPL monitor code"
689 config DYNAMIC_SYS_CLK_FREQ
690 bool "Determine CPU clock frequency at run-time"
692 Implement a get_board_sys_clk function that will determine the CPU
693 clock frequency at run time, rather than define it statically.
696 depends on !DYNAMIC_SYS_CLK_FREQ
697 int "CPU clock frequency"
698 default 125000000 if ARCH_LS1012A
699 default 100000000 if ARCH_P2020 || ARCH_T1024 || ARCH_T1042 || \
700 ARCH_LS1021A || FSL_LSCH2 || FSL_LSCH3
701 default 66666666 if ARCH_P1010 || ARCH_P1020 || ARCH_T4240
702 default 66660000 if ARCH_T2080
703 default 33333333 if RCAR_GEN3
704 default 24000000 if ARCH_EXYNOS
705 default 20000000 if RCAR_GEN2
708 A static value for the CPU frequency. Note that if not required
709 for a given SoC, this can be left at 0.
713 endmenu # General setup
715 source "boot/Kconfig"
717 source "common/Kconfig"
721 source "disk/Kconfig"
729 source "drivers/Kconfig"
735 source "test/Kconfig"
737 source "tools/Kconfig"