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6mainmenu "U-Boot $(UBOOTVERSION) Configuration"
7
8comment "Compiler: $(CC_VERSION_TEXT)"
9
10source "scripts/Kconfig.include"
11
12
13source "arch/Kconfig"
14
15menu "General setup"
16
17config BROKEN
18 bool
19 help
20 This option cannot be enabled. It is used as dependency
21 for broken and incomplete features.
22
23config DEPRECATED
24 bool
25 help
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.
29
30config LOCALVERSION
31 string "Local version - append to U-Boot release"
32 help
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.
39
40config LOCALVERSION_AUTO
41 bool "Automatically append version information to the version string"
42 default y
43 help
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
46 top of tree revision.
47
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.
52
53 (The actual string used here is the first eight characters produced
54 by running the command:
55
56 $ git rev-parse --verify HEAD
57
58 which is done within the script "scripts/setlocalversion".)
59
60config CC_IS_GCC
61 def_bool $(success,$(CC) --version | head -n 1 | grep -q gcc)
62
63config GCC_VERSION
64 int
65 default $(shell,$(srctree)/scripts/gcc-version.sh -p $(CC) | sed 's/^0*//') if CC_IS_GCC
66 default 0
67
68config CC_IS_CLANG
69 def_bool $(success,$(CC) --version | head -n 1 | grep -q clang)
70
71config CLANG_VERSION
72 int
73 default $(shell,$(srctree)/scripts/clang-version.sh $(CC))
74
75config CC_OPTIMIZE_FOR_SIZE
76 bool "Optimize for size"
77 default y
78 help
79 Enabling this option will pass "-Os" instead of "-O2" to gcc
80 resulting in a smaller U-Boot image.
81
82 This option is enabled by default for U-Boot.
83
84config OPTIMIZE_INLINING
85 bool "Allow compiler to uninline functions marked 'inline' in full U-Boot"
86 help
87 This option determines if U-Boot forces gcc to inline the functions
88 developers have marked 'inline'. Doing so takes away freedom from gcc to
89 do what it thinks is best, which is desirable in some cases for size
90 reasons.
91
92config SPL_OPTIMIZE_INLINING
93 bool "Allow compiler to uninline functions marked 'inline' in SPL"
94 depends on SPL
95 help
96 This option determines if U-Boot forces gcc to inline the functions
97 developers have marked 'inline'. Doing so takes away freedom from gcc to
98 do what it thinks is best, which is desirable in some cases for size
99 reasons.
100
101config ARCH_SUPPORTS_LTO
102 bool
103
104config LTO
105 bool "Enable Link Time Optimizations"
106 depends on ARCH_SUPPORTS_LTO
107 help
108 This option enables Link Time Optimization (LTO), a mechanism which
109 allows the compiler to optimize between different compilation units.
110
111 This can optimize away dead code paths, resulting in smaller binary
112 size (if CC_OPTIMIZE_FOR_SIZE is enabled).
113
114 This option is not available for every architecture and may
115 introduce bugs.
116
117 Currently, when compiling with GCC, due to a weird bug regarding
118 jobserver, the final linking will not respect make's --jobs argument.
119 Instead all available processors will be used (as reported by the
120 nproc command).
121
122 If unsure, say n.
123
124config TPL_OPTIMIZE_INLINING
125 bool "Allow compiler to uninline functions marked 'inline' in TPL"
126 depends on TPL
127 help
128 This option determines if U-Boot forces gcc to inline the functions
129 developers have marked 'inline'. Doing so takes away freedom from gcc to
130 do what it thinks is best, which is desirable in some cases for size
131 reasons.
132
133config CC_COVERAGE
134 bool "Enable code coverage analysis"
135 depends on SANDBOX
136 help
137 Enabling this option will pass "--coverage" to gcc to compile
138 and link code instrumented for coverage analysis.
139
140config CC_HAS_ASM_INLINE
141 def_bool $(success,echo 'void foo(void) { asm inline (""); }' | $(CC) -x c - -c -o /dev/null)
142
143config XEN
144 bool "Select U-Boot be run as a bootloader for XEN Virtual Machine"
145 help
146 Enabling this option will make U-Boot be run as a bootloader
147 for XEN [1] Virtual Machine.
148
149 Xen is a virtual machine monitor (VMM) or a type-1 hypervisor with support
150 for para-virtualization. Xen can organize the safe execution of several
151 virtual machines on the same physical system with performance close to
152 native. It is used as the basis for a number of different commercial and
153 open source applications, such as: server virtualization, Infrastructure
154 as a Service (IaaS), desktop virtualization, security applications,
155 embedded and hardware appliances.
156 Xen has a special VM called Domain-0 that runs the Dom0 kernel and allows
157 Xen to use the device drivers for the Domain-0 kernel by default.
158
159 [1] - https://xenproject.org/
160
161config DISTRO_DEFAULTS
162 bool "Select defaults suitable for booting general purpose Linux distributions"
163 select AUTO_COMPLETE
164 select CMDLINE_EDITING
165 select CMD_BOOTI if ARM64
166 select CMD_BOOTZ if ARM && !ARM64
167 select CMD_DHCP if CMD_NET
168 select CMD_ENV_EXISTS
169 select CMD_EXT2
170 select CMD_EXT4
171 select CMD_FAT
172 select CMD_FS_GENERIC
173 select CMD_PART if PARTITIONS
174 select CMD_PING if CMD_NET
175 select CMD_PXE if NET
176 select CMD_SYSBOOT
177 select ENV_VARS_UBOOT_CONFIG
178 select HUSH_PARSER
179 select SUPPORT_RAW_INITRD
180 select SYS_LONGHELP
181 imply CMD_MII if NET
182 imply USB_STORAGE
183 imply USE_BOOTCOMMAND
184 help
185 Select this to enable various options and commands which are suitable
186 for building u-boot for booting general purpose Linux distributions.
187
188config ENV_VARS_UBOOT_CONFIG
189 bool "Add arch, board, vendor and soc variables to default environment"
190 help
191 Define this in order to add variables describing the
192 U-Boot build configuration to the default environment.
193 These will be named arch, cpu, board, vendor, and soc.
194 Enabling this option will cause the following to be defined:
195 - CONFIG_SYS_ARCH
196 - CONFIG_SYS_CPU
197 - CONFIG_SYS_BOARD
198 - CONFIG_SYS_VENDOR
199 - CONFIG_SYS_SOC
200
201config NR_DRAM_BANKS
202 int "Number of DRAM banks"
203 default 1 if ARCH_SUNXI || ARCH_OWL
204 default 4
205 help
206 This defines the number of DRAM banks.
207
208config SYS_BOOT_GET_CMDLINE
209 bool "Enable kernel command line setup"
210 help
211 Enables allocating and saving kernel cmdline in space between
212 "bootm_low" and "bootm_low" + BOOTMAPSZ.
213
214config SYS_BOOT_GET_KBD
215 bool "Enable kernel board information setup"
216 help
217 Enables allocating and saving a kernel copy of the bd_info in
218 space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
219
220config SYS_MALLOC_F
221 bool "Enable malloc() pool before relocation"
222 default y if DM
223
224 help
225 Before relocation, memory is very limited on many platforms. Still,
226 we can provide a small malloc() pool if needed. Driver model in
227 particular needs this to operate, so that it can allocate the
228 initial serial device and any others that are needed.
229
230config SYS_MALLOC_F_LEN
231 hex "Size of malloc() pool before relocation"
232 depends on SYS_MALLOC_F
233 default 0x1000 if AM33XX
234 default 0x4000 if SANDBOX
235 default 0x2000 if (ARCH_IMX8 || ARCH_IMX8M || ARCH_MX7 || \
236 ARCH_MX7ULP || ARCH_MX6 || ARCH_MX5 || \
237 ARCH_LS1012A || ARCH_LS1021A || ARCH_LS1043A || \
238 ARCH_LS1046A || ARCH_QEMU || ARCH_SUNXI || ARCH_OWL)
239 default 0x400
240 help
241 Before relocation, memory is very limited on many platforms. Still,
242 we can provide a small malloc() pool if needed. Driver model in
243 particular needs this to operate, so that it can allocate the
244 initial serial device and any others that are needed.
245
246config SYS_MALLOC_LEN
247 hex "Define memory for Dynamic allocation"
248 default 0x2000000 if ARCH_ROCKCHIP || ARCH_OMAP2PLUS || ARCH_MESON
249 default 0x200000 if ARCH_BMIPS || X86
250 default 0x120000 if MACH_SUNIV
251 default 0x220000 if MACH_SUN8I_V3S
252 default 0x4020000 if ARCH_SUNXI
253 default 0x400000
254 help
255 This defines memory to be allocated for Dynamic allocation
256 TODO: Use for other architectures
257
258config 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
263 help
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.
268
269 It is possible to enable CONFIG_SYS_SPL_MALLOC_START to start a new
270 malloc() region in SDRAM once it is inited.
271
272config 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
276 help
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.
281
282menuconfig EXPERT
283 bool "Configure standard U-Boot features (expert users)"
284 default y
285 help
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.
290
291if EXPERT
292 config SYS_MALLOC_CLEAR_ON_INIT
293 bool "Init with zeros the memory reserved for malloc (slow)"
294 default y
295 help
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
299 slows the boot time.
300
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.
304 Warning:
305 When disabling this, please check if malloc calls, maybe
306 should be replaced by calloc - if one expects zeroed memory.
307
308config SYS_MALLOC_DEFAULT_TO_INIT
309 bool "Default malloc to init while reserving the memory for it"
310 help
311 It may happen that one needs to move the dynamic allocation
312 from one to another memory range, eg. when moving the malloc
313 from the limited static to a potentially large dynamic (DDR)
314 memory.
315
316 If so then on top of setting the updated memory aside one
317 needs to bring the malloc init.
318
319 If such a scenario is sought choose yes.
320
321config TOOLS_DEBUG
322 bool "Enable debug information for tools"
323 help
324 Enable generation of debug information for tools such as mkimage.
325 This can be used for debugging purposes. With debug information
326 it is possible to set breakpoints on particular lines, single-step
327 debug through the source code, etc.
328
329endif
330
331config PHYS_64BIT
332 bool "64bit physical address support"
333 help
334 Say Y here to support 64bit physical memory address.
335 This can be used not only for 64bit SoCs, but also for
336 large physical address extension on 32bit SoCs.
337
338config HAS_ROM
339 bool
340 select BINMAN
341 help
342 Enables building of a u-boot.rom target. This collects U-Boot and
343 any necessary binary blobs.
344
345config SPL_IMAGE
346 string "SPL image used in the combined SPL+U-Boot image"
347 default "spl/boot.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
348 default "spl/u-boot-spl.bin"
349 depends on SPL
350 help
351 Select the SPL build target that shall be generated by the SPL
352 build process (default spl/u-boot-spl.bin). This image will be
353 used to generate a combined image with SPL and main U-Boot
354 proper as one single image.
355
356config REMAKE_ELF
357 bool "Recreate an ELF image from raw U-Boot binary"
358 help
359 Enable this to recreate an ELF image (u-boot.elf) from the raw
360 U-Boot binary (u-boot.bin), which may already have been statically
361 relocated and may already have a device-tree appended to it.
362
363config BUILD_TARGET
364 string "Build target special images"
365 default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_ARRIA10
366 default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_GEN5
367 default "u-boot-spl.kwb" if ARCH_MVEBU && SPL
368 default "u-boot-elf.srec" if RCAR_GEN3
369 default "u-boot.itb" if !BINMAN && SPL_LOAD_FIT && (ARCH_ROCKCHIP || \
370 ARCH_SUNXI || RISCV || ARCH_ZYNQMP)
371 default "u-boot.kwb" if ARCH_KIRKWOOD
372 default "u-boot-with-spl.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
373 default "u-boot-with-spl.imx" if ARCH_MX6 && SPL
374 help
375 Some SoCs need special image types (e.g. U-Boot binary
376 with a special header) as build targets. By defining
377 CONFIG_BUILD_TARGET in the SoC / board header, this
378 special image will be automatically built upon calling
379 make / buildman.
380
381config SYS_CUSTOM_LDSCRIPT
382 bool "Use a custom location for the U-Boot linker script"
383 help
384 Normally when linking U-Boot we will look in the board directory,
385 the CPU directory and finally the "cpu" directory of the architecture
386 for the ile "u-boot.lds" and use that as our linker. However, in
387 some cases we need to provide a different linker script. To do so,
388 enable this option and then provide the location under
389 CONFIG_SYS_LDSCRIPT.
390
391config SYS_LDSCRIPT
392 depends on SYS_CUSTOM_LDSCRIPT
393 string "Custom ldscript location"
394 help
395 Path within the source tree to the linker script to use for the
396 main U-Boot binary.
397
398config SYS_LOAD_ADDR
399 hex "Address in memory to use by default"
400 default 0x01000000 if ARCH_SOCFPGA
401 default 0x02000000 if PPC || X86
402 default 0x81000000 if MACH_SUNIV
403 default 0x22000000 if MACH_SUN9I
404 default 0x42000000 if ARCH_SUNXI
405 default 0x82000000 if ARCH_KEYSTONE || ARCH_OMAP2PLUS || ARCH_K3
406 default 0x82000000 if ARCH_MX6 && (MX6SL || MX6SLL || MX6SX || MX6UL || MX6ULL)
407 default 0x12000000 if ARCH_MX6 && !(MX6SL || MX6SLL || MX6SX || MX6UL || MX6ULL)
408 default 0x80800000 if ARCH_MX7
409 default 0x90000000 if FSL_LSCH2 || FSL_LSCH3
410 help
411 Address in memory to use as the default safe load address.
412
413config ERR_PTR_OFFSET
414 hex
415 default 0x0
416 help
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.
426
427config PLATFORM_ELFENTRY
428 string
429 default "__start" if MIPS
430 default "_start"
431
432config STACK_SIZE
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
436 default 0x1000000
437 help
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.
441
442config SYS_HAS_SRAM
443 bool
444 default y if TARGET_PIC32MZDASK
445 default y if TARGET_DEVKIT8000
446 default y if TARGET_TRICORDER
447 help
448 Enable this to allow support for the on board SRAM.
449 SRAM base address is controlled by CONFIG_SYS_SRAM_BASE.
450 SRAM size is controlled by CONFIG_SYS_SRAM_SIZE.
451
452config SYS_SRAM_BASE
453 hex
454 default 0x80000000 if TARGET_PIC32MZDASK
455 default 0x40200000 if TARGET_DEVKIT8000
456 default 0x40200000 if TARGET_TRICORDER
457 default 0x0
458
459config SYS_SRAM_SIZE
460 hex
461 default 0x00080000 if TARGET_PIC32MZDASK
462 default 0x10000 if TARGET_DEVKIT8000
463 default 0x10000 if TARGET_TRICORDER
464 default 0x0
465
466config MP
467 bool "Support for multiprocessor"
468 help
469 This provides an option to bringup different processors
470 in multiprocessor cases.
471
472config EXAMPLES
473 bool "Compile API examples"
474 depends on !SANDBOX
475 default y if ARCH_QEMU
476 help
477 U-Boot provides an API for standalone applications. Examples are
478 provided in directory examples/.
479
480endmenu
481
482source "api/Kconfig"
483
484source "boot/Kconfig"
485
486source "common/Kconfig"
487
488source "cmd/Kconfig"
489
490source "disk/Kconfig"
491
492source "dts/Kconfig"
493
494source "env/Kconfig"
495
496source "net/Kconfig"
497
498source "drivers/Kconfig"
499
500source "fs/Kconfig"
501
502source "lib/Kconfig"
503
504source "test/Kconfig"
505
506source "tools/Kconfig"
507
