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 default 0x2000000 if ARCH_ROCKCHIP || ARCH_OMAP2PLUS || ARCH_MESON
253 default 0x4020000 if ARCH_SUNXI && !MACH_SUN8I_V3S
254 default 0x200000 if ARCH_BMIPS || X86
255 default 0x220000 if ARCH_SUNXI && MACH_SUN8I_V3S
258 This defines memory to be allocated for Dynamic allocation
259 TODO: Use for other architectures
261 config SPL_SYS_MALLOC_F_LEN
262 hex "Size of malloc() pool in SPL"
263 depends on SYS_MALLOC_F && SPL
264 default 0x2800 if RCAR_GEN3
265 default SYS_MALLOC_F_LEN
267 In SPL memory is very limited on many platforms. Still,
268 we can provide a small malloc() pool if needed. Driver model in
269 particular needs this to operate, so that it can allocate the
270 initial serial device and any others that are needed.
272 It is possible to enable CONFIG_SYS_SPL_MALLOC_START to start a new
273 malloc() region in SDRAM once it is inited.
275 config TPL_SYS_MALLOC_F_LEN
276 hex "Size of malloc() pool in TPL"
277 depends on SYS_MALLOC_F && TPL
278 default SPL_SYS_MALLOC_F_LEN
280 In TPL 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.
286 bool "Configure standard U-Boot features (expert users)"
289 This option allows certain base U-Boot options and settings
290 to be disabled or tweaked. This is for specialized
291 environments which can tolerate a "non-standard" U-Boot.
292 Use this only if you really know what you are doing.
295 config SYS_MALLOC_CLEAR_ON_INIT
296 bool "Init with zeros the memory reserved for malloc (slow)"
299 This setting is enabled by default. The reserved malloc
300 memory is initialized with zeros, so first malloc calls
301 will return the pointer to the zeroed memory. But this
304 It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
305 value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
306 Then the boot time can be significantly reduced.
308 When disabling this, please check if malloc calls, maybe
309 should be replaced by calloc - if one expects zeroed memory.
311 config SYS_MALLOC_DEFAULT_TO_INIT
312 bool "Default malloc to init while reserving the memory for it"
315 It may happen that one needs to move the dynamic allocation
316 from one to another memory range, eg. when moving the malloc
317 from the limited static to a potentially large dynamic (DDR)
320 If so then on top of setting the updated memory aside one
321 needs to bring the malloc init.
323 If such a scenario is sought choose yes.
326 bool "Enable debug information for tools"
328 Enable generation of debug information for tools such as mkimage.
329 This can be used for debugging purposes. With debug information
330 it is possible to set breakpoints on particular lines, single-step
331 debug through the source code, etc.
336 bool "64bit physical address support"
338 Say Y here to support 64bit physical memory address.
339 This can be used not only for 64bit SoCs, but also for
340 large physical address extension on 32bit SoCs.
346 Enables building of a u-boot.rom target. This collects U-Boot and
347 any necessary binary blobs.
350 string "SPL image used in the combined SPL+U-Boot image"
351 default "spl/boot.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
352 default "spl/u-boot-spl.bin"
355 Select the SPL build target that shall be generated by the SPL
356 build process (default spl/u-boot-spl.bin). This image will be
357 used to generate a combined image with SPL and main U-Boot
358 proper as one single image.
361 string "Build target special images"
362 default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_ARRIA10
363 default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_GEN5
364 default "u-boot-spl.kwb" if ARCH_MVEBU && SPL
365 default "u-boot-elf.srec" if RCAR_GEN3
366 default "u-boot.itb" if !BINMAN && SPL_LOAD_FIT && (ARCH_ROCKCHIP || \
367 ARCH_SUNXI || RISCV || ARCH_ZYNQMP)
368 default "u-boot.kwb" if ARCH_KIRKWOOD
369 default "u-boot-with-spl.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
370 default "u-boot-with-spl.imx" if ARCH_MX6 && SPL
372 Some SoCs need special image types (e.g. U-Boot binary
373 with a special header) as build targets. By defining
374 CONFIG_BUILD_TARGET in the SoC / board header, this
375 special image will be automatically built upon calling
378 config SYS_CUSTOM_LDSCRIPT
379 bool "Use a custom location for the U-Boot linker script"
381 Normally when linking U-Boot we will look in the board directory,
382 the CPU directory and finally the "cpu" directory of the architecture
383 for the ile "u-boot.lds" and use that as our linker. However, in
384 some cases we need to provide a different linker script. To do so,
385 enable this option and then provide the location under
389 depends on SYS_CUSTOM_LDSCRIPT
390 string "Custom ldscript location"
392 Path within the source tree to the linker script to use for the
396 hex "Address in memory to use by default"
397 default 0x01000000 if ARCH_SOCFPGA
398 default 0x02000000 if PPC || X86
399 default 0x22000000 if MACH_SUN9I
400 default 0x42000000 if ARCH_SUNXI && !MACH_SUN9I
401 default 0x82000000 if ARCH_KEYSTONE || ARCH_OMAP2PLUS || ARCH_K3
402 default 0x82000000 if ARCH_MX6 && (MX6SL || MX6SLL || MX6SX || MX6UL || MX6ULL)
403 default 0x12000000 if ARCH_MX6 && !(MX6SL || MX6SLL || MX6SX || MX6UL || MX6ULL)
404 default 0x80800000 if ARCH_MX7
405 default 0x90000000 if FSL_LSCH2 || FSL_LSCH3
407 Address in memory to use as the default safe load address.
409 config ERR_PTR_OFFSET
413 Some U-Boot pointers have redundant information, so we can use a
414 scheme where we can return either an error code or a pointer with the
415 same return value. The default implementation just casts the pointer
416 to a number, however, this may fail on platforms where the end of the
417 address range is used for valid pointers (e.g. 0xffffff00 is a valid
418 heap pointer in socfpga SPL).
419 For such platforms, this value provides an upper range of those error
420 pointer values - up to 'MAX_ERRNO' bytes below this value must be
421 unused/invalid addresses.
423 config PLATFORM_ELFENTRY
425 default "__start" if MIPS
429 hex "Define max stack size that can be used by U-Boot"
430 default 0x4000000 if ARCH_VERSAL || ARCH_ZYNQMP
431 default 0x200000 if MICROBLAZE
434 Define Max stack size that can be used by U-Boot. This value is used
435 by the UEFI sub-system. On some boards initrd_high is calculated as
436 base stack pointer minus this stack size.
440 default y if TARGET_PIC32MZDASK
441 default y if TARGET_DEVKIT8000
442 default y if TARGET_TRICORDER
445 Enable this to allow support for the on board SRAM.
446 SRAM base address is controlled by CONFIG_SYS_SRAM_BASE.
447 SRAM size is controlled by CONFIG_SYS_SRAM_SIZE.
451 default 0x80000000 if TARGET_PIC32MZDASK
452 default 0x40200000 if TARGET_DEVKIT8000
453 default 0x40200000 if TARGET_TRICORDER
458 default 0x00080000 if TARGET_PIC32MZDASK
459 default 0x10000 if TARGET_DEVKIT8000
460 default 0x10000 if TARGET_TRICORDER
464 bool "Compile API examples"
466 default y if ARCH_QEMU
468 U-Boot provides an API for standalone applications. Examples are
469 provided in directory examples/.
471 endmenu # General setup
475 source "common/Kconfig"
479 source "disk/Kconfig"
487 source "drivers/Kconfig"
493 source "test/Kconfig"
495 source "tools/Kconfig"