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.
157 config CC_HAS_ASM_INLINE
158 def_bool $(success,echo 'void foo(void) { asm inline (""); }' | $(CC) -x c - -c -o /dev/null)
161 bool "Select U-Boot be run as a bootloader for XEN Virtual Machine"
163 Enabling this option will make U-Boot be run as a bootloader
164 for XEN [1] Virtual Machine.
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.
176 [1] - https://xenproject.org/
178 config DISTRO_DEFAULTS
179 bool "Select defaults suitable for booting general purpose Linux distributions"
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
189 select CMD_FS_GENERIC
190 select CMD_PART if PARTITIONS
191 select CMD_PING if CMD_NET
192 select CMD_PXE if NET
194 select ENV_VARS_UBOOT_CONFIG
196 select SUPPORT_RAW_INITRD
200 imply USE_BOOTCOMMAND
202 Select this to enable various options and commands which are suitable
203 for building u-boot for booting general purpose Linux distributions.
205 config ENV_VARS_UBOOT_CONFIG
206 bool "Add arch, board, vendor and soc variables to default environment"
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:
219 int "Number of DRAM banks"
220 default 1 if ARCH_SUNXI || ARCH_OWL
223 This defines the number of DRAM banks.
225 config SYS_BOOT_GET_CMDLINE
226 bool "Enable kernel command line setup"
228 Enables allocating and saving kernel cmdline in space between
229 "bootm_low" and "bootm_low" + BOOTMAPSZ.
232 int "Size of kernel command line buffer in bytes"
233 depends on SYS_BOOT_GET_CMDLINE
236 Buffer size for Boot Arguments which are passed to the application
237 (usually a Linux kernel) when it is booted
239 config SYS_BOOT_GET_KBD
240 bool "Enable kernel board information setup"
242 Enables allocating and saving a kernel copy of the bd_info in
243 space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
246 bool "Enable malloc() pool before relocation"
250 Before relocation, memory is very limited on many platforms. Still,
251 we can provide a small malloc() pool if needed. Driver model in
252 particular needs this to operate, so that it can allocate the
253 initial serial device and any others that are needed.
255 config SYS_MALLOC_F_LEN
256 hex "Size of malloc() pool before relocation"
257 depends on SYS_MALLOC_F
258 default 0x400 if M68K || PPC || ROCKCHIP_PX30 || ROCKCHIP_RK3036 || \
259 ROCKCHIP_RK3308 || ROCKCHIP_RV1108
260 default 0x600 if ARCH_ZYNQMP_R5 || ARCH_ZYNQMP
261 default 0x800 if ARCH_ZYNQ || ROCKCHIP_RK3128 || ROCKCHIP_RK3188 || \
262 ROCKCHIP_RK322X || X86
263 default 0x1000 if ARCH_MESON || ARCH_BMIPS || ARCH_MTMIPS
264 default 0x1800 if ARCH_TEGRA
265 default 0x4000 if SANDBOX || RISCV || ARCH_APPLE || ROCKCHIP_RK3368 || \
267 default 0x8000 if RCAR_GEN3
268 default 0x10000 if ARCH_IMX8 || (ARCH_IMX8M && !IMX8MQ)
271 Before relocation, memory is very limited on many platforms. Still,
272 we can provide a small malloc() pool if needed. Driver model in
273 particular needs this to operate, so that it can allocate the
274 initial serial device and any others that are needed.
276 config SYS_MALLOC_LEN
277 hex "Define memory for Dynamic allocation"
278 default 0x4000000 if SANDBOX
279 default 0x2000000 if ARCH_ROCKCHIP || ARCH_OMAP2PLUS || ARCH_MESON
280 default 0x200000 if ARCH_BMIPS || X86
281 default 0x120000 if MACH_SUNIV
282 default 0x220000 if MACH_SUN8I_V3S
283 default 0x4020000 if ARCH_SUNXI
286 This defines memory to be allocated for Dynamic allocation
287 TODO: Use for other architectures
289 config SPL_SYS_MALLOC_F_LEN
290 hex "Size of malloc() pool in SPL"
291 depends on SYS_MALLOC_F && SPL
292 default 0 if !SPL_FRAMEWORK
293 default 0x2800 if RCAR_GEN3
294 default SYS_MALLOC_F_LEN
296 In SPL memory is very limited on many platforms. Still,
297 we can provide a small malloc() pool if needed. Driver model in
298 particular needs this to operate, so that it can allocate the
299 initial serial device and any others that are needed.
301 It is possible to enable CONFIG_SYS_SPL_MALLOC_START to start a new
302 malloc() region in SDRAM once it is inited.
304 config TPL_SYS_MALLOC_F_LEN
305 hex "Size of malloc() pool in TPL"
306 depends on SYS_MALLOC_F && TPL
307 default SPL_SYS_MALLOC_F_LEN
309 In TPL memory is very limited on many platforms. Still,
310 we can provide a small malloc() pool if needed. Driver model in
311 particular needs this to operate, so that it can allocate the
312 initial serial device and any others that are needed.
315 bool "Inform valgrind about memory allocations"
318 Valgrind is an instrumentation framework for building dynamic analysis
319 tools. In particular, it may be used to detect memory management bugs
320 in U-Boot. It relies on knowing when heap blocks are allocated in
321 order to give accurate results. This happens automatically for
322 standard allocator functions provided by the host OS. However, this
323 doesn't automatically happen for U-Boot's malloc implementation.
325 Enable this option to annotate U-Boot's malloc implementation so that
326 it can be handled accurately by Valgrind. If you aren't planning on
327 using valgrind to debug U-Boot, say 'n'.
329 config VPL_SYS_MALLOC_F_LEN
330 hex "Size of malloc() pool in VPL before relocation"
331 depends on SYS_MALLOC_F && VPL
332 default SYS_MALLOC_F_LEN
334 Before relocation, 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.
340 bool "Configure standard U-Boot features (expert users)"
343 This option allows certain base U-Boot options and settings
344 to be disabled or tweaked. This is for specialized
345 environments which can tolerate a "non-standard" U-Boot.
346 Use this only if you really know what you are doing.
349 config SYS_MALLOC_CLEAR_ON_INIT
350 bool "Init with zeros the memory reserved for malloc (slow)"
353 This setting is enabled by default. The reserved malloc
354 memory is initialized with zeros, so first malloc calls
355 will return the pointer to the zeroed memory. But this
358 It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
359 value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
360 Then the boot time can be significantly reduced.
362 When disabling this, please check if malloc calls, maybe
363 should be replaced by calloc - if one expects zeroed memory.
365 config SYS_MALLOC_DEFAULT_TO_INIT
366 bool "Default malloc to init while reserving the memory for it"
368 It may happen that one needs to move the dynamic allocation
369 from one to another memory range, eg. when moving the malloc
370 from the limited static to a potentially large dynamic (DDR)
373 If so then on top of setting the updated memory aside one
374 needs to bring the malloc init.
376 If such a scenario is sought choose yes.
379 bool "Enable debug information for tools"
381 Enable generation of debug information for tools such as mkimage.
382 This can be used for debugging purposes. With debug information
383 it is possible to set breakpoints on particular lines, single-step
384 debug through the source code, etc.
389 bool "64bit physical address support"
391 Say Y here to support 64bit physical memory address.
392 This can be used not only for 64bit SoCs, but also for
393 large physical address extension on 32bit SoCs.
399 Enables building of a u-boot.rom target. This collects U-Boot and
400 any necessary binary blobs.
403 string "SPL image used in the combined SPL+U-Boot image"
404 default "spl/boot.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
405 default "spl/u-boot-spl.bin"
408 Select the SPL build target that shall be generated by the SPL
409 build process (default spl/u-boot-spl.bin). This image will be
410 used to generate a combined image with SPL and main U-Boot
411 proper as one single image.
414 bool "Recreate an ELF image from raw U-Boot binary"
416 Enable this to recreate an ELF image (u-boot.elf) from the raw
417 U-Boot binary (u-boot.bin), which may already have been statically
418 relocated and may already have a device-tree appended to it.
421 string "Build target special images"
422 default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_ARRIA10
423 default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_GEN5
424 default "u-boot-spl.kwb" if ARCH_MVEBU && SPL
425 default "u-boot-elf.srec" if RCAR_GEN3
426 default "u-boot.itb" if !BINMAN && SPL_LOAD_FIT && (ARCH_ROCKCHIP || \
427 ARCH_SUNXI || RISCV || ARCH_ZYNQMP)
428 default "u-boot.kwb" if ARCH_KIRKWOOD
429 default "u-boot-with-spl.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
430 default "u-boot-with-spl.imx" if ARCH_MX6 && SPL
432 Some SoCs need special image types (e.g. U-Boot binary
433 with a special header) as build targets. By defining
434 CONFIG_BUILD_TARGET in the SoC / board header, this
435 special image will be automatically built upon calling
438 config HAS_BOARD_SIZE_LIMIT
439 bool "Define a maximum size for the U-Boot image"
440 default y if RCAR_GEN3
442 In some cases, we need to enforce a hard limit on how big the U-Boot
445 config BOARD_SIZE_LIMIT
446 int "Maximum size of the U-Boot image in bytes"
447 default 1048576 if RCAR_GEN3
448 depends on HAS_BOARD_SIZE_LIMIT
450 Maximum size of the U-Boot image. When defined, the build system
451 checks that the actual size does not exceed it. This does not
452 include SPL nor TPL, on platforms that use that functionality, they
453 have a separate option to restict size.
455 config SYS_CUSTOM_LDSCRIPT
456 bool "Use a custom location for the U-Boot linker script"
458 Normally when linking U-Boot we will look in the board directory,
459 the CPU directory and finally the "cpu" directory of the architecture
460 for the ile "u-boot.lds" and use that as our linker. However, in
461 some cases we need to provide a different linker script. To do so,
462 enable this option and then provide the location under
466 depends on SYS_CUSTOM_LDSCRIPT
467 string "Custom ldscript location"
469 Path within the source tree to the linker script to use for the
473 hex "Address in memory to use by default"
474 default 0x01000000 if ARCH_SOCFPGA
475 default 0x02000000 if PPC || X86
476 default 0x81000000 if MACH_SUNIV
477 default 0x22000000 if MACH_SUN9I
478 default 0x42000000 if ARCH_SUNXI
479 default 0x82000000 if ARCH_KEYSTONE || ARCH_OMAP2PLUS || ARCH_K3
480 default 0x82000000 if ARCH_MX6 && (MX6SL || MX6SLL || MX6SX || MX6UL || MX6ULL)
481 default 0x12000000 if ARCH_MX6 && !(MX6SL || MX6SLL || MX6SX || MX6UL || MX6ULL)
482 default 0x80800000 if ARCH_MX7
483 default 0x90000000 if FSL_LSCH2 || FSL_LSCH3
485 Address in memory to use as the default safe load address.
487 config ERR_PTR_OFFSET
491 Some U-Boot pointers have redundant information, so we can use a
492 scheme where we can return either an error code or a pointer with the
493 same return value. The default implementation just casts the pointer
494 to a number, however, this may fail on platforms where the end of the
495 address range is used for valid pointers (e.g. 0xffffff00 is a valid
496 heap pointer in socfpga SPL).
497 For such platforms, this value provides an upper range of those error
498 pointer values - up to 'MAX_ERRNO' bytes below this value must be
499 unused/invalid addresses.
501 config PLATFORM_ELFENTRY
503 default "__start" if MIPS
507 hex "Define max stack size that can be used by U-Boot"
508 default 0x4000000 if ARCH_VERSAL || ARCH_ZYNQMP
509 default 0x200000 if MICROBLAZE
512 Define Max stack size that can be used by U-Boot. This value is used
513 by the UEFI sub-system. On some boards initrd_high is calculated as
514 base stack pointer minus this stack size.
516 config SYS_MEM_TOP_HIDE
517 hex "Exclude some memory from U-Boot / OS information"
520 If set, this specified memory area will get subtracted from the top
521 (end) of RAM and won't get "touched" at all by U-Boot. By fixing up
522 gd->ram_size the OS / next stage should gets passed the now
523 "corrected" memory size and won't touch it either.
524 WARNING: Please make sure that this value is a multiple of the OS
529 default y if TARGET_PIC32MZDASK
530 default y if TARGET_DEVKIT8000
531 default y if TARGET_TRICORDER
533 Enable this to allow support for the on board SRAM.
534 SRAM base address is controlled by CONFIG_SYS_SRAM_BASE.
535 SRAM size is controlled by CONFIG_SYS_SRAM_SIZE.
539 default 0x80000000 if TARGET_PIC32MZDASK
540 default 0x40200000 if TARGET_DEVKIT8000
541 default 0x40200000 if TARGET_TRICORDER
546 default 0x00080000 if TARGET_PIC32MZDASK
547 default 0x10000 if TARGET_DEVKIT8000
548 default 0x10000 if TARGET_TRICORDER
552 bool "Support for multiprocessor"
554 This provides an option to bringup different processors
555 in multiprocessor cases.
558 bool "Compile API examples"
560 default y if ARCH_QEMU
562 U-Boot provides an API for standalone applications. Examples are
563 provided in directory examples/.
565 endmenu # General setup
569 source "boot/Kconfig"
571 source "common/Kconfig"
575 source "disk/Kconfig"
583 source "drivers/Kconfig"
589 source "test/Kconfig"
591 source "tools/Kconfig"