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))
75 config CC_OPTIMIZE_FOR_SIZE
76 bool "Optimize for size"
79 Enabling this option will pass "-Os" instead of "-O2" to gcc
80 resulting in a smaller U-Boot image.
82 This option is enabled by default for U-Boot.
84 config OPTIMIZE_INLINING
85 bool "Allow compiler to uninline functions marked 'inline' in full U-Boot"
88 This option determines if U-Boot forces gcc to inline the functions
89 developers have marked 'inline'. Doing so takes away freedom from gcc to
90 do what it thinks is best, which is desirable in some cases for size
93 config SPL_OPTIMIZE_INLINING
94 bool "Allow compiler to uninline functions marked 'inline' in SPL"
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 ARCH_SUPPORTS_LTO
107 bool "Enable Link Time Optimizations"
108 depends on ARCH_SUPPORTS_LTO
111 This option enables Link Time Optimization (LTO), a mechanism which
112 allows the compiler to optimize between different compilation units.
114 This can optimize away dead code paths, resulting in smaller binary
115 size (if CC_OPTIMIZE_FOR_SIZE is enabled).
117 This option is not available for every architecture and may
120 Currently, when compiling with GCC, due to a weird bug regarding
121 jobserver, the final linking will not respect make's --jobs argument.
122 Instead all available processors will be used (as reported by the
127 config TPL_OPTIMIZE_INLINING
128 bool "Allow compiler to uninline functions marked 'inline' in TPL"
132 This option determines if U-Boot forces gcc to inline the functions
133 developers have marked 'inline'. Doing so takes away freedom from gcc to
134 do what it thinks is best, which is desirable in some cases for size
138 bool "Enable code coverage analysis"
141 Enabling this option will pass "--coverage" to gcc to compile
142 and link code instrumented for coverage analysis.
144 config CC_HAS_ASM_INLINE
145 def_bool $(success,echo 'void foo(void) { asm inline (""); }' | $(CC) -x c - -c -o /dev/null)
148 bool "Select U-Boot be run as a bootloader for XEN Virtual Machine"
150 Enabling this option will make U-Boot be run as a bootloader
151 for XEN [1] Virtual Machine.
153 Xen is a virtual machine monitor (VMM) or a type-1 hypervisor with support
154 for para-virtualization. Xen can organize the safe execution of several
155 virtual machines on the same physical system with performance close to
156 native. It is used as the basis for a number of different commercial and
157 open source applications, such as: server virtualization, Infrastructure
158 as a Service (IaaS), desktop virtualization, security applications,
159 embedded and hardware appliances.
160 Xen has a special VM called Domain-0 that runs the Dom0 kernel and allows
161 Xen to use the device drivers for the Domain-0 kernel by default.
163 [1] - https://xenproject.org/
165 config DISTRO_DEFAULTS
166 bool "Select defaults suitable for booting general purpose Linux distributions"
168 select CMDLINE_EDITING
169 select CMD_BOOTI if ARM64
170 select CMD_BOOTZ if ARM && !ARM64
171 select CMD_DHCP if CMD_NET
172 select CMD_ENV_EXISTS
176 select CMD_FS_GENERIC
177 select CMD_PART if PARTITIONS
178 select CMD_PING if CMD_NET
179 select CMD_PXE if NET
181 select ENV_VARS_UBOOT_CONFIG
183 select SUPPORT_RAW_INITRD
187 imply USE_BOOTCOMMAND
189 Select this to enable various options and commands which are suitable
190 for building u-boot for booting general purpose Linux distributions.
192 config ENV_VARS_UBOOT_CONFIG
193 bool "Add arch, board, vendor and soc variables to default environment"
195 Define this in order to add variables describing the
196 U-Boot build configuration to the default environment.
197 These will be named arch, cpu, board, vendor, and soc.
198 Enabling this option will cause the following to be defined:
206 int "Number of DRAM banks"
207 default 1 if ARCH_SUNXI || ARCH_OWL
210 This defines the number of DRAM banks.
212 config SYS_BOOT_GET_CMDLINE
213 bool "Enable kernel command line setup"
215 Enables allocating and saving kernel cmdline in space between
216 "bootm_low" and "bootm_low" + BOOTMAPSZ.
218 config SYS_BOOT_GET_KBD
219 bool "Enable kernel board information setup"
221 Enables allocating and saving a kernel copy of the bd_info in
222 space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
225 bool "Enable malloc() pool before relocation"
229 Before relocation, memory is very limited on many platforms. Still,
230 we can provide a small malloc() pool if needed. Driver model in
231 particular needs this to operate, so that it can allocate the
232 initial serial device and any others that are needed.
234 config SYS_MALLOC_F_LEN
235 hex "Size of malloc() pool before relocation"
236 depends on SYS_MALLOC_F
237 default 0x1000 if AM33XX
238 default 0x4000 if SANDBOX
239 default 0x2000 if (ARCH_IMX8 || ARCH_IMX8M || ARCH_MX7 || \
240 ARCH_MX7ULP || ARCH_MX6 || ARCH_MX5 || \
241 ARCH_LS1012A || ARCH_LS1021A || ARCH_LS1043A || \
242 ARCH_LS1046A || ARCH_QEMU || ARCH_SUNXI || ARCH_OWL)
245 Before relocation, memory is very limited on many platforms. Still,
246 we can provide a small malloc() pool if needed. Driver model in
247 particular needs this to operate, so that it can allocate the
248 initial serial device and any others that are needed.
250 config SYS_MALLOC_LEN
251 hex "Define memory for Dynamic allocation"
252 depends on ARCH_ZYNQ || ARCH_VERSAL || ARCH_STM32MP || ARCH_ROCKCHIP
253 default 0x2000000 if ARCH_ROCKCHIP
255 This defines memory to be allocated for Dynamic allocation
256 TODO: Use for other architectures
258 config SPL_SYS_MALLOC_F_LEN
259 hex "Size of malloc() pool in SPL"
260 depends on SYS_MALLOC_F && SPL
261 default 0x2800 if RCAR_GEN3
262 default SYS_MALLOC_F_LEN
264 In SPL memory is very limited on many platforms. Still,
265 we can provide a small malloc() pool if needed. Driver model in
266 particular needs this to operate, so that it can allocate the
267 initial serial device and any others that are needed.
269 It is possible to enable CONFIG_SYS_SPL_MALLOC_START to start a new
270 malloc() region in SDRAM once it is inited.
272 config TPL_SYS_MALLOC_F_LEN
273 hex "Size of malloc() pool in TPL"
274 depends on SYS_MALLOC_F && TPL
275 default SPL_SYS_MALLOC_F_LEN
277 In TPL memory is very limited on many platforms. Still,
278 we can provide a small malloc() pool if needed. Driver model in
279 particular needs this to operate, so that it can allocate the
280 initial serial device and any others that are needed.
283 bool "Configure standard U-Boot features (expert users)"
286 This option allows certain base U-Boot options and settings
287 to be disabled or tweaked. This is for specialized
288 environments which can tolerate a "non-standard" U-Boot.
289 Use this only if you really know what you are doing.
292 config SYS_MALLOC_CLEAR_ON_INIT
293 bool "Init with zeros the memory reserved for malloc (slow)"
296 This setting is enabled by default. The reserved malloc
297 memory is initialized with zeros, so first malloc calls
298 will return the pointer to the zeroed memory. But this
301 It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
302 value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
303 Then the boot time can be significantly reduced.
305 When disabling this, please check if malloc calls, maybe
306 should be replaced by calloc - if one expects zeroed memory.
308 config SYS_MALLOC_DEFAULT_TO_INIT
309 bool "Default malloc to init while reserving the memory for it"
312 It may happen that one needs to move the dynamic allocation
313 from one to another memory range, eg. when moving the malloc
314 from the limited static to a potentially large dynamic (DDR)
317 If so then on top of setting the updated memory aside one
318 needs to bring the malloc init.
320 If such a scenario is sought choose yes.
323 bool "Enable debug information for tools"
325 Enable generation of debug information for tools such as mkimage.
326 This can be used for debugging purposes. With debug information
327 it is possible to set breakpoints on particular lines, single-step
328 debug through the source code, etc.
333 bool "64bit physical address support"
335 Say Y here to support 64bit physical memory address.
336 This can be used not only for 64bit SoCs, but also for
337 large physical address extension on 32bit SoCs.
343 Enables building of a u-boot.rom target. This collects U-Boot and
344 any necessary binary blobs.
346 config ROM_NEEDS_BLOBS
350 Enable this if building the u-boot.rom target needs binary blobs, and
351 so cannot be done normally. In this case, U-Boot will only build the
352 ROM if the required blobs exist. If not, you will see an warning like:
354 Image 'main-section' is missing external blobs and is non-functional:
355 intel-descriptor intel-me intel-refcode intel-vga intel-mrc
358 bool "Build U-Boot as BIOS replacement"
360 default y if !ROM_NEEDS_BLOBS
362 This option allows to build a ROM version of U-Boot.
363 The build process generally requires several binary blobs
364 which are not shipped in the U-Boot source tree.
365 Please, see doc/arch/x86.rst for details.
368 string "SPL image used in the combined SPL+U-Boot image"
369 default "spl/boot.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
370 default "spl/u-boot-spl.bin"
373 Select the SPL build target that shall be generated by the SPL
374 build process (default spl/u-boot-spl.bin). This image will be
375 used to generate a combined image with SPL and main U-Boot
376 proper as one single image.
379 string "Build target special images"
380 default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_ARRIA10
381 default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_GEN5
382 default "u-boot-spl.kwb" if ARCH_MVEBU && SPL
383 default "u-boot-elf.srec" if RCAR_GEN3
384 default "u-boot.itb" if !BINMAN && SPL_LOAD_FIT && (ARCH_ROCKCHIP || \
385 ARCH_SUNXI || RISCV || ARCH_ZYNQMP)
386 default "u-boot.kwb" if ARCH_KIRKWOOD
387 default "u-boot-with-spl.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
388 default "u-boot-with-spl.imx" if ARCH_MX6 && SPL
390 Some SoCs need special image types (e.g. U-Boot binary
391 with a special header) as build targets. By defining
392 CONFIG_BUILD_TARGET in the SoC / board header, this
393 special image will be automatically built upon calling
396 config SYS_CUSTOM_LDSCRIPT
397 bool "Use a custom location for the U-Boot linker script"
399 Normally when linking U-Boot we will look in the board directory,
400 the CPU directory and finally the "cpu" directory of the architecture
401 for the ile "u-boot.lds" and use that as our linker. However, in
402 some cases we need to provide a different linker script. To do so,
403 enable this option and then provide the location under
407 depends on SYS_CUSTOM_LDSCRIPT
408 string "Custom ldscript location"
410 Path within the source tree to the linker script to use for the
413 config ERR_PTR_OFFSET
417 Some U-Boot pointers have redundant information, so we can use a
418 scheme where we can return either an error code or a pointer with the
419 same return value. The default implementation just casts the pointer
420 to a number, however, this may fail on platforms where the end of the
421 address range is used for valid pointers (e.g. 0xffffff00 is a valid
422 heap pointer in socfpga SPL).
423 For such platforms, this value provides an upper range of those error
424 pointer values - up to 'MAX_ERRNO' bytes below this value must be
425 unused/invalid addresses.
427 config PLATFORM_ELFENTRY
429 default "__start" if MIPS
433 hex "Define max stack size that can be used by U-Boot"
434 default 0x4000000 if ARCH_VERSAL || ARCH_ZYNQMP
435 default 0x200000 if MICROBLAZE
438 Define Max stack size that can be used by U-Boot. This value is used
439 by the UEFI sub-system. On some boards initrd_high is calculated as
440 base stack pointer minus this stack size.
444 default y if TARGET_PIC32MZDASK
445 default y if TARGET_DEVKIT8000
446 default y if TARGET_TRICORDER
449 Enable this to allow support for the on board SRAM.
450 SRAM base address is controlled by CONFIG_SYS_SRAM_BASE.
451 SRAM size is controlled by CONFIG_SYS_SRAM_SIZE.
455 default 0x80000000 if TARGET_PIC32MZDASK
456 default 0x40200000 if TARGET_DEVKIT8000
457 default 0x40200000 if TARGET_TRICORDER
462 default 0x00080000 if TARGET_PIC32MZDASK
463 default 0x10000 if TARGET_DEVKIT8000
464 default 0x10000 if TARGET_TRICORDER
468 bool "Compile API examples"
470 default y if ARCH_QEMU
472 U-Boot provides an API for standalone applications. Examples are
473 provided in directory examples/.
475 endmenu # General setup
479 source "common/Kconfig"
483 source "disk/Kconfig"
491 source "drivers/Kconfig"
497 source "test/Kconfig"
499 source "tools/Kconfig"