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.
231 config SYS_BOOT_GET_KBD
232 bool "Enable kernel board information setup"
234 Enables allocating and saving a kernel copy of the bd_info in
235 space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
238 bool "Enable malloc() pool before relocation"
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.
247 config SYS_MALLOC_F_LEN
248 hex "Size of malloc() pool before relocation"
249 depends on SYS_MALLOC_F
250 default 0x1000 if AM33XX
251 default 0x4000 if SANDBOX || RISCV
252 default 0x2000 if (ARCH_MX7 || ARCH_MX7ULP || ARCH_MX6 || ARCH_MX5 || \
253 ARCH_QEMU || ARCH_SUNXI || ARCH_OWL || IMX8MQ)
254 default 0x10000 if (ARCH_IMX8 || (ARCH_IMX8M && !IMX8MQ) || \
255 ARCH_LS1012A || ARCH_LS1021A || ARCH_LS1043A || \
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_LEN
265 hex "Define memory for Dynamic allocation"
266 default 0x2000000 if ARCH_ROCKCHIP || ARCH_OMAP2PLUS || ARCH_MESON
267 default 0x200000 if ARCH_BMIPS || X86
268 default 0x120000 if MACH_SUNIV
269 default 0x220000 if MACH_SUN8I_V3S
270 default 0x4020000 if ARCH_SUNXI
273 This defines memory to be allocated for Dynamic allocation
274 TODO: Use for other architectures
276 config SPL_SYS_MALLOC_F_LEN
277 hex "Size of malloc() pool in SPL"
278 depends on SYS_MALLOC_F && SPL
279 default 0x2800 if RCAR_GEN3
280 default SYS_MALLOC_F_LEN
282 In SPL memory is very limited on many platforms. Still,
283 we can provide a small malloc() pool if needed. Driver model in
284 particular needs this to operate, so that it can allocate the
285 initial serial device and any others that are needed.
287 It is possible to enable CONFIG_SYS_SPL_MALLOC_START to start a new
288 malloc() region in SDRAM once it is inited.
290 config TPL_SYS_MALLOC_F_LEN
291 hex "Size of malloc() pool in TPL"
292 depends on SYS_MALLOC_F && TPL
293 default SPL_SYS_MALLOC_F_LEN
295 In TPL memory is very limited on many platforms. Still,
296 we can provide a small malloc() pool if needed. Driver model in
297 particular needs this to operate, so that it can allocate the
298 initial serial device and any others that are needed.
301 bool "Inform valgrind about memory allocations"
303 Valgrind is an instrumentation framework for building dynamic analysis
304 tools. In particular, it may be used to detect memory management bugs
305 in U-Boot. It relies on knowing when heap blocks are allocated in
306 order to give accurate results. This happens automatically for
307 standard allocator functions provided by the host OS. However, this
308 doesn't automatically happen for U-Boot's malloc implementation.
310 Enable this option to annotate U-Boot's malloc implementation so that
311 it can be handled accurately by Valgrind. If you aren't planning on
312 using valgrind to debug U-Boot, say 'n'.
315 bool "Configure standard U-Boot features (expert users)"
318 This option allows certain base U-Boot options and settings
319 to be disabled or tweaked. This is for specialized
320 environments which can tolerate a "non-standard" U-Boot.
321 Use this only if you really know what you are doing.
324 config SYS_MALLOC_CLEAR_ON_INIT
325 bool "Init with zeros the memory reserved for malloc (slow)"
328 This setting is enabled by default. The reserved malloc
329 memory is initialized with zeros, so first malloc calls
330 will return the pointer to the zeroed memory. But this
333 It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
334 value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
335 Then the boot time can be significantly reduced.
337 When disabling this, please check if malloc calls, maybe
338 should be replaced by calloc - if one expects zeroed memory.
340 config SYS_MALLOC_DEFAULT_TO_INIT
341 bool "Default malloc to init while reserving the memory for it"
343 It may happen that one needs to move the dynamic allocation
344 from one to another memory range, eg. when moving the malloc
345 from the limited static to a potentially large dynamic (DDR)
348 If so then on top of setting the updated memory aside one
349 needs to bring the malloc init.
351 If such a scenario is sought choose yes.
354 bool "Enable debug information for tools"
356 Enable generation of debug information for tools such as mkimage.
357 This can be used for debugging purposes. With debug information
358 it is possible to set breakpoints on particular lines, single-step
359 debug through the source code, etc.
364 bool "64bit physical address support"
366 Say Y here to support 64bit physical memory address.
367 This can be used not only for 64bit SoCs, but also for
368 large physical address extension on 32bit SoCs.
374 Enables building of a u-boot.rom target. This collects U-Boot and
375 any necessary binary blobs.
378 string "SPL image used in the combined SPL+U-Boot image"
379 default "spl/boot.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
380 default "spl/u-boot-spl.bin"
383 Select the SPL build target that shall be generated by the SPL
384 build process (default spl/u-boot-spl.bin). This image will be
385 used to generate a combined image with SPL and main U-Boot
386 proper as one single image.
389 bool "Recreate an ELF image from raw U-Boot binary"
391 Enable this to recreate an ELF image (u-boot.elf) from the raw
392 U-Boot binary (u-boot.bin), which may already have been statically
393 relocated and may already have a device-tree appended to it.
396 string "Build target special images"
397 default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_ARRIA10
398 default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_GEN5
399 default "u-boot-spl.kwb" if ARCH_MVEBU && SPL
400 default "u-boot-elf.srec" if RCAR_GEN3
401 default "u-boot.itb" if !BINMAN && SPL_LOAD_FIT && (ARCH_ROCKCHIP || \
402 ARCH_SUNXI || RISCV || ARCH_ZYNQMP)
403 default "u-boot.kwb" if ARCH_KIRKWOOD
404 default "u-boot-with-spl.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
405 default "u-boot-with-spl.imx" if ARCH_MX6 && SPL
407 Some SoCs need special image types (e.g. U-Boot binary
408 with a special header) as build targets. By defining
409 CONFIG_BUILD_TARGET in the SoC / board header, this
410 special image will be automatically built upon calling
413 config HAS_BOARD_SIZE_LIMIT
414 bool "Define a maximum size for the U-Boot image"
415 default y if RCAR_GEN3
417 In some cases, we need to enforce a hard limit on how big the U-Boot
420 config BOARD_SIZE_LIMIT
421 int "Maximum size of the U-Boot image in bytes"
422 default 1048576 if RCAR_GEN3
423 depends on HAS_BOARD_SIZE_LIMIT
425 Maximum size of the U-Boot image. When defined, the build system
426 checks that the actual size does not exceed it. This does not
427 include SPL nor TPL, on platforms that use that functionality, they
428 have a separate option to restict size.
430 config SYS_CUSTOM_LDSCRIPT
431 bool "Use a custom location for the U-Boot linker script"
433 Normally when linking U-Boot we will look in the board directory,
434 the CPU directory and finally the "cpu" directory of the architecture
435 for the ile "u-boot.lds" and use that as our linker. However, in
436 some cases we need to provide a different linker script. To do so,
437 enable this option and then provide the location under
441 depends on SYS_CUSTOM_LDSCRIPT
442 string "Custom ldscript location"
444 Path within the source tree to the linker script to use for the
448 hex "Address in memory to use by default"
449 default 0x01000000 if ARCH_SOCFPGA
450 default 0x02000000 if PPC || X86
451 default 0x81000000 if MACH_SUNIV
452 default 0x22000000 if MACH_SUN9I
453 default 0x42000000 if ARCH_SUNXI
454 default 0x82000000 if ARCH_KEYSTONE || ARCH_OMAP2PLUS || ARCH_K3
455 default 0x82000000 if ARCH_MX6 && (MX6SL || MX6SLL || MX6SX || MX6UL || MX6ULL)
456 default 0x12000000 if ARCH_MX6 && !(MX6SL || MX6SLL || MX6SX || MX6UL || MX6ULL)
457 default 0x80800000 if ARCH_MX7
458 default 0x90000000 if FSL_LSCH2 || FSL_LSCH3
460 Address in memory to use as the default safe load address.
462 config ERR_PTR_OFFSET
466 Some U-Boot pointers have redundant information, so we can use a
467 scheme where we can return either an error code or a pointer with the
468 same return value. The default implementation just casts the pointer
469 to a number, however, this may fail on platforms where the end of the
470 address range is used for valid pointers (e.g. 0xffffff00 is a valid
471 heap pointer in socfpga SPL).
472 For such platforms, this value provides an upper range of those error
473 pointer values - up to 'MAX_ERRNO' bytes below this value must be
474 unused/invalid addresses.
476 config PLATFORM_ELFENTRY
478 default "__start" if MIPS
482 hex "Define max stack size that can be used by U-Boot"
483 default 0x4000000 if ARCH_VERSAL || ARCH_ZYNQMP
484 default 0x200000 if MICROBLAZE
487 Define Max stack size that can be used by U-Boot. This value is used
488 by the UEFI sub-system. On some boards initrd_high is calculated as
489 base stack pointer minus this stack size.
493 default y if TARGET_PIC32MZDASK
494 default y if TARGET_DEVKIT8000
495 default y if TARGET_TRICORDER
497 Enable this to allow support for the on board SRAM.
498 SRAM base address is controlled by CONFIG_SYS_SRAM_BASE.
499 SRAM size is controlled by CONFIG_SYS_SRAM_SIZE.
503 default 0x80000000 if TARGET_PIC32MZDASK
504 default 0x40200000 if TARGET_DEVKIT8000
505 default 0x40200000 if TARGET_TRICORDER
510 default 0x00080000 if TARGET_PIC32MZDASK
511 default 0x10000 if TARGET_DEVKIT8000
512 default 0x10000 if TARGET_TRICORDER
516 bool "Support for multiprocessor"
518 This provides an option to bringup different processors
519 in multiprocessor cases.
522 bool "Compile API examples"
524 default y if ARCH_QEMU
526 U-Boot provides an API for standalone applications. Examples are
527 provided in directory examples/.
529 endmenu # General setup
533 source "boot/Kconfig"
535 source "common/Kconfig"
539 source "disk/Kconfig"
547 source "drivers/Kconfig"
553 source "test/Kconfig"
555 source "tools/Kconfig"