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_LEN
299 hex "Size of malloc() pool in SPL"
300 depends on SYS_MALLOC_F && SPL
301 default 0x0 if !SPL_FRAMEWORK
302 default 0x2800 if RCAR_GEN3
303 default 0x2000 if IMX8MQ
304 default SYS_MALLOC_F_LEN
306 In SPL memory is very limited on many platforms. Still,
307 we can provide a small malloc() pool if needed. Driver model in
308 particular needs this to operate, so that it can allocate the
309 initial serial device and any others that are needed.
311 It is possible to enable CFG_SYS_SPL_MALLOC_START to start a new
312 malloc() region in SDRAM once it is inited.
314 config TPL_SYS_MALLOC_F_LEN
315 hex "Size of malloc() pool in TPL"
316 depends on SYS_MALLOC_F && TPL
317 default SPL_SYS_MALLOC_F_LEN
319 In TPL memory is very limited on many platforms. Still,
320 we can provide a small malloc() pool if needed. Driver model in
321 particular needs this to operate, so that it can allocate the
322 initial serial device and any others that are needed.
325 bool "Inform valgrind about memory allocations"
328 Valgrind is an instrumentation framework for building dynamic analysis
329 tools. In particular, it may be used to detect memory management bugs
330 in U-Boot. It relies on knowing when heap blocks are allocated in
331 order to give accurate results. This happens automatically for
332 standard allocator functions provided by the host OS. However, this
333 doesn't automatically happen for U-Boot's malloc implementation.
335 Enable this option to annotate U-Boot's malloc implementation so that
336 it can be handled accurately by Valgrind. If you aren't planning on
337 using valgrind to debug U-Boot, say 'n'.
339 config VPL_SYS_MALLOC_F_LEN
340 hex "Size of malloc() pool in VPL before relocation"
341 depends on SYS_MALLOC_F && VPL
342 default SYS_MALLOC_F_LEN
344 Before relocation, memory is very limited on many platforms. Still,
345 we can provide a small malloc() pool if needed. Driver model in
346 particular needs this to operate, so that it can allocate the
347 initial serial device and any others that are needed.
350 bool "Configure standard U-Boot features (expert users)"
353 This option allows certain base U-Boot options and settings
354 to be disabled or tweaked. This is for specialized
355 environments which can tolerate a "non-standard" U-Boot.
356 Use this only if you really know what you are doing.
359 config SYS_MALLOC_CLEAR_ON_INIT
360 bool "Init with zeros the memory reserved for malloc (slow)"
363 This setting is enabled by default. The reserved malloc
364 memory is initialized with zeros, so first malloc calls
365 will return the pointer to the zeroed memory. But this
368 It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
369 value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
370 Then the boot time can be significantly reduced.
372 When disabling this, please check if malloc calls, maybe
373 should be replaced by calloc - if one expects zeroed memory.
375 config SPL_SYS_MALLOC_CLEAR_ON_INIT
376 bool "Init with zeros the memory reserved for malloc (slow) in SPL"
378 default SYS_MALLOC_CLEAR_ON_INIT
380 Same as SYS_MALLOC_CLEAR_ON_INIT, but for SPL. It's possible to
381 Enable it without SYS_MALLOC_CLEAR_ON_INIT. It's useful for boards
382 that must have particular memory regions zero'ed before first use.
383 If SYS_SPL_MALLOC_START is configured to be in such region, this
384 option should be enabled.
386 config SYS_MALLOC_DEFAULT_TO_INIT
387 bool "Default malloc to init while reserving the memory for it"
389 It may happen that one needs to move the dynamic allocation
390 from one to another memory range, eg. when moving the malloc
391 from the limited static to a potentially large dynamic (DDR)
394 If so then on top of setting the updated memory aside one
395 needs to bring the malloc init.
397 If such a scenario is sought choose yes.
400 bool "Enable debug information for tools"
402 Enable generation of debug information for tools such as mkimage.
403 This can be used for debugging purposes. With debug information
404 it is possible to set breakpoints on particular lines, single-step
405 debug through the source code, etc.
410 bool "64bit physical address support"
413 Say Y here to support 64bit physical memory address.
414 This can be used not only for 64bit SoCs, but also for
415 large physical address extension on 32bit SoCs.
418 bool "64bit fdt address support"
420 Say Y here to support 64bit fdt addresses.
421 This can be used not only for 64bit SoCs, but also
422 for large address extensions on 32bit SoCs.
428 Enables building of a u-boot.rom target. This collects U-Boot and
429 any necessary binary blobs.
432 string "SPL image used in the combined SPL+U-Boot image"
433 default "spl/boot.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
434 default "spl/u-boot-spl.bin"
437 Select the SPL build target that shall be generated by the SPL
438 build process (default spl/u-boot-spl.bin). This image will be
439 used to generate a combined image with SPL and main U-Boot
440 proper as one single image.
443 bool "Recreate an ELF image from raw U-Boot binary"
445 Enable this to recreate an ELF image (u-boot.elf) from the raw
446 U-Boot binary (u-boot.bin), which may already have been statically
447 relocated and may already have a device-tree appended to it.
450 string "Build target special images"
451 default "u-boot-elf.srec" if RCAR_64
452 default "u-boot-with-spl.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
453 default "u-boot-with-spl.bin" if MPC85xx && !E500MC && !E5500 && !E6500 && SPL
454 default "u-boot-with-spl.imx" if ARCH_MX6 && SPL
455 default "u-boot-with-spl.kwb" if ARMADA_32BIT && SPL
456 default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_ARRIA10
457 default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_GEN5
458 default "u-boot.itb" if !BINMAN && SPL_LOAD_FIT && (ARCH_ROCKCHIP || \
459 RISCV || ARCH_ZYNQMP)
460 default "u-boot.kwb" if (ARCH_KIRKWOOD || ARMADA_32BIT) && !SPL
462 Some SoCs need special image types (e.g. U-Boot binary
463 with a special header) as build targets. By defining
464 CONFIG_BUILD_TARGET in the SoC / board header, this
465 special image will be automatically built upon calling
468 config HAS_BOARD_SIZE_LIMIT
469 bool "Define a maximum size for the U-Boot image"
472 In some cases, we need to enforce a hard limit on how big the U-Boot
475 config BOARD_SIZE_LIMIT
476 int "Maximum size of the U-Boot image in bytes"
477 default 1048576 if RCAR_64
478 depends on HAS_BOARD_SIZE_LIMIT
480 Maximum size of the U-Boot image. When defined, the build system
481 checks that the actual size does not exceed it. This does not
482 include SPL nor TPL, on platforms that use that functionality, they
483 have a separate option to restict size.
485 config SYS_CUSTOM_LDSCRIPT
486 bool "Use a custom location for the U-Boot linker script"
488 Normally when linking U-Boot we will look in the board directory,
489 the CPU directory and finally the "cpu" directory of the architecture
490 for the ile "u-boot.lds" and use that as our linker. However, in
491 some cases we need to provide a different linker script. To do so,
492 enable this option and then provide the location under
496 depends on SYS_CUSTOM_LDSCRIPT
497 string "Custom ldscript location"
499 Path within the source tree to the linker script to use for the
503 hex "Address in memory to use by default"
504 default 0x01000000 if ARCH_SOCFPGA
505 default 0x02000000 if PPC || X86
506 default 0x81000000 if MACH_SUNIV
507 default 0x22000000 if MACH_SUN9I
508 default 0x42000000 if ARCH_SUNXI
509 default 0x82000000 if ARCH_KEYSTONE || ARCH_OMAP2PLUS || ARCH_K3
510 default 0x82000000 if ARCH_MX6 && (MX6SL || MX6SLL || MX6SX || MX6UL || MX6ULL)
511 default 0x12000000 if ARCH_MX6 && !(MX6SL || MX6SLL || MX6SX || MX6UL || MX6ULL)
512 default 0x80800000 if ARCH_MX7
513 default 0x90000000 if FSL_LSCH2 || FSL_LSCH3
515 Address in memory to use as the default safe load address.
517 config ERR_PTR_OFFSET
521 Some U-Boot pointers have redundant information, so we can use a
522 scheme where we can return either an error code or a pointer with the
523 same return value. The default implementation just casts the pointer
524 to a number, however, this may fail on platforms where the end of the
525 address range is used for valid pointers (e.g. 0xffffff00 is a valid
526 heap pointer in socfpga SPL).
527 For such platforms, this value provides an upper range of those error
528 pointer values - up to 'MAX_ERRNO' bytes below this value must be
529 unused/invalid addresses.
531 config PLATFORM_ELFENTRY
533 default "__start" if MIPS
537 hex "Define max stack size that can be used by U-Boot"
538 default 0x4000000 if ARCH_VERSAL_NET || ARCH_VERSAL || ARCH_ZYNQMP
539 default 0x200000 if MICROBLAZE
542 Define Max stack size that can be used by U-Boot. This value is used
543 by the UEFI sub-system. On some boards initrd_high is calculated as
544 base stack pointer minus this stack size.
546 config SYS_MEM_TOP_HIDE
547 hex "Exclude some memory from U-Boot / OS information"
550 If set, this specified memory area will get subtracted from the top
551 (end) of RAM and won't get "touched" at all by U-Boot. By fixing up
552 gd->ram_size the OS / next stage should gets passed the now
553 "corrected" memory size and won't touch it either.
554 WARNING: Please make sure that this value is a multiple of the OS
559 default y if TARGET_PIC32MZDASK
560 default y if TARGET_DEVKIT8000
561 default y if TARGET_TRICORDER
563 Enable this to allow support for the on board SRAM.
564 SRAM base address is controlled by CONFIG_SYS_SRAM_BASE.
565 SRAM size is controlled by CONFIG_SYS_SRAM_SIZE.
569 default 0x80000000 if TARGET_PIC32MZDASK
570 default 0x40200000 if TARGET_DEVKIT8000
571 default 0x40200000 if TARGET_TRICORDER
576 default 0x00080000 if TARGET_PIC32MZDASK
577 default 0x10000 if TARGET_DEVKIT8000
578 default 0x10000 if TARGET_TRICORDER
581 config SYS_MONITOR_LEN
582 int "Maximum size in bytes reserved for U-Boot in memory"
583 default 1048576 if X86
584 default 786432 if ARCH_SUNXI
587 Size of memory reserved for monitor code, used to determine
588 _at_compile_time_ (!) if the environment is embedded within the
589 U-Boot image, or in a separate flash sector, among other uses where
590 we need to set a maximum size of the U-Boot binary itself that will
594 bool "Support for multiprocessor"
596 This provides an option to bringup different processors
597 in multiprocessor cases.
599 endmenu # General setup
603 source "boot/Kconfig"
605 source "common/Kconfig"
609 source "disk/Kconfig"
617 source "drivers/Kconfig"
623 source "test/Kconfig"
625 source "tools/Kconfig"