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
95 config OPTIMIZE_INLINING
96 bool "Allow compiler to uninline functions marked 'inline' in full U-Boot"
98 This option determines if U-Boot forces gcc to inline the functions
99 developers have marked 'inline'. Doing so takes away freedom from gcc to
100 do what it thinks is best, which is desirable in some cases for size
103 config SPL_OPTIMIZE_INLINING
104 bool "Allow compiler to uninline functions marked 'inline' in SPL"
107 This option determines if U-Boot forces gcc to inline the functions
108 developers have marked 'inline'. Doing so takes away freedom from gcc to
109 do what it thinks is best, which is desirable in some cases for size
112 config ARCH_SUPPORTS_LTO
116 bool "Enable Link Time Optimizations"
117 depends on ARCH_SUPPORTS_LTO
119 This option enables Link Time Optimization (LTO), a mechanism which
120 allows the compiler to optimize between different compilation units.
122 This can optimize away dead code paths, resulting in smaller binary
123 size (if CC_OPTIMIZE_FOR_SIZE is enabled).
125 This option is not available for every architecture and may
128 Currently, when compiling with GCC, due to a weird bug regarding
129 jobserver, the final linking will not respect make's --jobs argument.
130 Instead all available processors will be used (as reported by the
135 config TPL_OPTIMIZE_INLINING
136 bool "Allow compiler to uninline functions marked 'inline' in TPL"
139 This option determines if U-Boot forces gcc to inline the functions
140 developers have marked 'inline'. Doing so takes away freedom from gcc to
141 do what it thinks is best, which is desirable in some cases for size
145 bool "Enable code coverage analysis"
148 Enabling this option will pass "--coverage" to gcc to compile
149 and link code instrumented for coverage analysis.
151 config CC_HAS_ASM_INLINE
152 def_bool $(success,echo 'void foo(void) { asm inline (""); }' | $(CC) -x c - -c -o /dev/null)
155 bool "Select U-Boot be run as a bootloader for XEN Virtual Machine"
157 Enabling this option will make U-Boot be run as a bootloader
158 for XEN [1] Virtual Machine.
160 Xen is a virtual machine monitor (VMM) or a type-1 hypervisor with support
161 for para-virtualization. Xen can organize the safe execution of several
162 virtual machines on the same physical system with performance close to
163 native. It is used as the basis for a number of different commercial and
164 open source applications, such as: server virtualization, Infrastructure
165 as a Service (IaaS), desktop virtualization, security applications,
166 embedded and hardware appliances.
167 Xen has a special VM called Domain-0 that runs the Dom0 kernel and allows
168 Xen to use the device drivers for the Domain-0 kernel by default.
170 [1] - https://xenproject.org/
172 config DISTRO_DEFAULTS
173 bool "Select defaults suitable for booting general purpose Linux distributions"
175 select CMDLINE_EDITING
176 select CMD_BOOTI if ARM64
177 select CMD_BOOTZ if ARM && !ARM64
178 select CMD_DHCP if CMD_NET
179 select CMD_ENV_EXISTS
183 select CMD_FS_GENERIC
184 select CMD_PART if PARTITIONS
185 select CMD_PING if CMD_NET
186 select CMD_PXE if NET
188 select ENV_VARS_UBOOT_CONFIG
190 select SUPPORT_RAW_INITRD
194 imply USE_BOOTCOMMAND
196 Select this to enable various options and commands which are suitable
197 for building u-boot for booting general purpose Linux distributions.
199 config ENV_VARS_UBOOT_CONFIG
200 bool "Add arch, board, vendor and soc variables to default environment"
202 Define this in order to add variables describing the
203 U-Boot build configuration to the default environment.
204 These will be named arch, cpu, board, vendor, and soc.
205 Enabling this option will cause the following to be defined:
213 int "Number of DRAM banks"
214 default 1 if ARCH_SUNXI || ARCH_OWL
217 This defines the number of DRAM banks.
219 config SYS_BOOT_GET_CMDLINE
220 bool "Enable kernel command line setup"
222 Enables allocating and saving kernel cmdline in space between
223 "bootm_low" and "bootm_low" + BOOTMAPSZ.
225 config SYS_BOOT_GET_KBD
226 bool "Enable kernel board information setup"
228 Enables allocating and saving a kernel copy of the bd_info in
229 space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
232 bool "Enable malloc() pool before relocation"
236 Before relocation, memory is very limited on many platforms. Still,
237 we can provide a small malloc() pool if needed. Driver model in
238 particular needs this to operate, so that it can allocate the
239 initial serial device and any others that are needed.
241 config SYS_MALLOC_F_LEN
242 hex "Size of malloc() pool before relocation"
243 depends on SYS_MALLOC_F
244 default 0x1000 if AM33XX
245 default 0x4000 if SANDBOX
246 default 0x2000 if (ARCH_IMX8 || ARCH_IMX8M || ARCH_MX7 || \
247 ARCH_MX7ULP || ARCH_MX6 || ARCH_MX5 || \
248 ARCH_LS1012A || ARCH_LS1021A || ARCH_LS1043A || \
249 ARCH_LS1046A || ARCH_QEMU || ARCH_SUNXI || ARCH_OWL)
252 Before relocation, memory is very limited on many platforms. Still,
253 we can provide a small malloc() pool if needed. Driver model in
254 particular needs this to operate, so that it can allocate the
255 initial serial device and any others that are needed.
257 config SYS_MALLOC_LEN
258 hex "Define memory for Dynamic allocation"
259 default 0x2000000 if ARCH_ROCKCHIP || ARCH_OMAP2PLUS || ARCH_MESON
260 default 0x200000 if ARCH_BMIPS || X86
261 default 0x120000 if MACH_SUNIV
262 default 0x220000 if MACH_SUN8I_V3S
263 default 0x4020000 if ARCH_SUNXI
266 This defines memory to be allocated for Dynamic allocation
267 TODO: Use for other architectures
269 config SPL_SYS_MALLOC_F_LEN
270 hex "Size of malloc() pool in SPL"
271 depends on SYS_MALLOC_F && SPL
272 default 0x2800 if RCAR_GEN3
273 default SYS_MALLOC_F_LEN
275 In SPL memory is very limited on many platforms. Still,
276 we can provide a small malloc() pool if needed. Driver model in
277 particular needs this to operate, so that it can allocate the
278 initial serial device and any others that are needed.
280 It is possible to enable CONFIG_SYS_SPL_MALLOC_START to start a new
281 malloc() region in SDRAM once it is inited.
283 config TPL_SYS_MALLOC_F_LEN
284 hex "Size of malloc() pool in TPL"
285 depends on SYS_MALLOC_F && TPL
286 default SPL_SYS_MALLOC_F_LEN
288 In TPL memory is very limited on many platforms. Still,
289 we can provide a small malloc() pool if needed. Driver model in
290 particular needs this to operate, so that it can allocate the
291 initial serial device and any others that are needed.
294 bool "Configure standard U-Boot features (expert users)"
297 This option allows certain base U-Boot options and settings
298 to be disabled or tweaked. This is for specialized
299 environments which can tolerate a "non-standard" U-Boot.
300 Use this only if you really know what you are doing.
303 config SYS_MALLOC_CLEAR_ON_INIT
304 bool "Init with zeros the memory reserved for malloc (slow)"
307 This setting is enabled by default. The reserved malloc
308 memory is initialized with zeros, so first malloc calls
309 will return the pointer to the zeroed memory. But this
312 It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
313 value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
314 Then the boot time can be significantly reduced.
316 When disabling this, please check if malloc calls, maybe
317 should be replaced by calloc - if one expects zeroed memory.
319 config SYS_MALLOC_DEFAULT_TO_INIT
320 bool "Default malloc to init while reserving the memory for it"
322 It may happen that one needs to move the dynamic allocation
323 from one to another memory range, eg. when moving the malloc
324 from the limited static to a potentially large dynamic (DDR)
327 If so then on top of setting the updated memory aside one
328 needs to bring the malloc init.
330 If such a scenario is sought choose yes.
333 bool "Enable debug information for tools"
335 Enable generation of debug information for tools such as mkimage.
336 This can be used for debugging purposes. With debug information
337 it is possible to set breakpoints on particular lines, single-step
338 debug through the source code, etc.
343 bool "64bit physical address support"
345 Say Y here to support 64bit physical memory address.
346 This can be used not only for 64bit SoCs, but also for
347 large physical address extension on 32bit SoCs.
353 Enables building of a u-boot.rom target. This collects U-Boot and
354 any necessary binary blobs.
357 string "SPL image used in the combined SPL+U-Boot image"
358 default "spl/boot.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
359 default "spl/u-boot-spl.bin"
362 Select the SPL build target that shall be generated by the SPL
363 build process (default spl/u-boot-spl.bin). This image will be
364 used to generate a combined image with SPL and main U-Boot
365 proper as one single image.
368 bool "Recreate an ELF image from raw U-Boot binary"
370 Enable this to recreate an ELF image (u-boot.elf) from the raw
371 U-Boot binary (u-boot.bin), which may already have been statically
372 relocated and may already have a device-tree appended to it.
375 string "Build target special images"
376 default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_ARRIA10
377 default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_GEN5
378 default "u-boot-spl.kwb" if ARCH_MVEBU && SPL
379 default "u-boot-elf.srec" if RCAR_GEN3
380 default "u-boot.itb" if !BINMAN && SPL_LOAD_FIT && (ARCH_ROCKCHIP || \
381 ARCH_SUNXI || RISCV || ARCH_ZYNQMP)
382 default "u-boot.kwb" if ARCH_KIRKWOOD
383 default "u-boot-with-spl.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
384 default "u-boot-with-spl.imx" if ARCH_MX6 && SPL
386 Some SoCs need special image types (e.g. U-Boot binary
387 with a special header) as build targets. By defining
388 CONFIG_BUILD_TARGET in the SoC / board header, this
389 special image will be automatically built upon calling
392 config SYS_CUSTOM_LDSCRIPT
393 bool "Use a custom location for the U-Boot linker script"
395 Normally when linking U-Boot we will look in the board directory,
396 the CPU directory and finally the "cpu" directory of the architecture
397 for the ile "u-boot.lds" and use that as our linker. However, in
398 some cases we need to provide a different linker script. To do so,
399 enable this option and then provide the location under
403 depends on SYS_CUSTOM_LDSCRIPT
404 string "Custom ldscript location"
406 Path within the source tree to the linker script to use for the
410 hex "Address in memory to use by default"
411 default 0x01000000 if ARCH_SOCFPGA
412 default 0x02000000 if PPC || X86
413 default 0x81000000 if MACH_SUNIV
414 default 0x22000000 if MACH_SUN9I
415 default 0x42000000 if ARCH_SUNXI
416 default 0x82000000 if ARCH_KEYSTONE || ARCH_OMAP2PLUS || ARCH_K3
417 default 0x82000000 if ARCH_MX6 && (MX6SL || MX6SLL || MX6SX || MX6UL || MX6ULL)
418 default 0x12000000 if ARCH_MX6 && !(MX6SL || MX6SLL || MX6SX || MX6UL || MX6ULL)
419 default 0x80800000 if ARCH_MX7
420 default 0x90000000 if FSL_LSCH2 || FSL_LSCH3
422 Address in memory to use as the default safe load address.
424 config ERR_PTR_OFFSET
428 Some U-Boot pointers have redundant information, so we can use a
429 scheme where we can return either an error code or a pointer with the
430 same return value. The default implementation just casts the pointer
431 to a number, however, this may fail on platforms where the end of the
432 address range is used for valid pointers (e.g. 0xffffff00 is a valid
433 heap pointer in socfpga SPL).
434 For such platforms, this value provides an upper range of those error
435 pointer values - up to 'MAX_ERRNO' bytes below this value must be
436 unused/invalid addresses.
438 config PLATFORM_ELFENTRY
440 default "__start" if MIPS
444 hex "Define max stack size that can be used by U-Boot"
445 default 0x4000000 if ARCH_VERSAL || ARCH_ZYNQMP
446 default 0x200000 if MICROBLAZE
449 Define Max stack size that can be used by U-Boot. This value is used
450 by the UEFI sub-system. On some boards initrd_high is calculated as
451 base stack pointer minus this stack size.
455 default y if TARGET_PIC32MZDASK
456 default y if TARGET_DEVKIT8000
457 default y if TARGET_TRICORDER
459 Enable this to allow support for the on board SRAM.
460 SRAM base address is controlled by CONFIG_SYS_SRAM_BASE.
461 SRAM size is controlled by CONFIG_SYS_SRAM_SIZE.
465 default 0x80000000 if TARGET_PIC32MZDASK
466 default 0x40200000 if TARGET_DEVKIT8000
467 default 0x40200000 if TARGET_TRICORDER
472 default 0x00080000 if TARGET_PIC32MZDASK
473 default 0x10000 if TARGET_DEVKIT8000
474 default 0x10000 if TARGET_TRICORDER
478 bool "Support for multiprocessor"
480 This provides an option to bringup different processors
481 in multiprocessor cases.
484 bool "Compile API examples"
486 default y if ARCH_QEMU
488 U-Boot provides an API for standalone applications. Examples are
489 provided in directory examples/.
491 endmenu # General setup
495 source "boot/Kconfig"
497 source "common/Kconfig"
501 source "disk/Kconfig"
509 source "drivers/Kconfig"
515 source "test/Kconfig"
517 source "tools/Kconfig"