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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_OPTIMIZE_FOR_SIZE
61 bool "Optimize for size"
62 default y
63 help
64 Enabling this option will pass "-Os" instead of "-O2" to gcc
65 resulting in a smaller U-Boot image.
66
67 This option is enabled by default for U-Boot.
68
69config OPTIMIZE_INLINING
70 bool "Allow compiler to uninline functions marked 'inline' in full U-Boot"
71 default n
72 help
73 This option determines if U-Boot forces gcc to inline the functions
74 developers have marked 'inline'. Doing so takes away freedom from gcc to
75 do what it thinks is best, which is desirable in some cases for size
76 reasons.
77
78config SPL_OPTIMIZE_INLINING
79 bool "Allow compiler to uninline functions marked 'inline' in SPL"
80 depends on SPL
81 default n
82 help
83 This option determines if U-Boot forces gcc to inline the functions
84 developers have marked 'inline'. Doing so takes away freedom from gcc to
85 do what it thinks is best, which is desirable in some cases for size
86 reasons.
87
88config ARCH_SUPPORTS_LTO
89 bool
90
91config LTO
92 bool "Enable Link Time Optimizations"
93 depends on ARCH_SUPPORTS_LTO
94 default n
95 help
96 This option enables Link Time Optimization (LTO), a mechanism which
97 allows the compiler to optimize between different compilation units.
98
99 This can optimize away dead code paths, resulting in smaller binary
100 size (if CC_OPTIMIZE_FOR_SIZE is enabled).
101
102 This option is not available for every architecture and may
103 introduce bugs.
104
105 Currently, when compiling with GCC, due to a weird bug regarding
106 jobserver, the final linking will not respect make's --jobs argument.
107 Instead all available processors will be used (as reported by the
108 nproc command).
109
110 If unsure, say n.
111
112config TPL_OPTIMIZE_INLINING
113 bool "Allow compiler to uninline functions marked 'inline' in TPL"
114 depends on TPL
115 default n
116 help
117 This option determines if U-Boot forces gcc to inline the functions
118 developers have marked 'inline'. Doing so takes away freedom from gcc to
119 do what it thinks is best, which is desirable in some cases for size
120 reasons.
121
122config CC_COVERAGE
123 bool "Enable code coverage analysis"
124 depends on SANDBOX
125 help
126 Enabling this option will pass "--coverage" to gcc to compile
127 and link code instrumented for coverage analysis.
128
129config CC_HAS_ASM_INLINE
130 def_bool $(success,echo 'void foo(void) { asm inline (""); }' | $(CC) -x c - -c -o /dev/null)
131
132config XEN
133 bool "Select U-Boot be run as a bootloader for XEN Virtual Machine"
134 help
135 Enabling this option will make U-Boot be run as a bootloader
136 for XEN [1] Virtual Machine.
137
138 Xen is a virtual machine monitor (VMM) or a type-1 hypervisor with support
139 for para-virtualization. Xen can organize the safe execution of several
140 virtual machines on the same physical system with performance close to
141 native. It is used as the basis for a number of different commercial and
142 open source applications, such as: server virtualization, Infrastructure
143 as a Service (IaaS), desktop virtualization, security applications,
144 embedded and hardware appliances.
145 Xen has a special VM called Domain-0 that runs the Dom0 kernel and allows
146 Xen to use the device drivers for the Domain-0 kernel by default.
147
148 [1] - https://xenproject.org/
149
150config DISTRO_DEFAULTS
151 bool "Select defaults suitable for booting general purpose Linux distributions"
152 select AUTO_COMPLETE
153 select CMDLINE_EDITING
154 select CMD_BOOTI if ARM64
155 select CMD_BOOTZ if ARM && !ARM64
156 select CMD_DHCP if CMD_NET
157 select CMD_ENV_EXISTS
158 select CMD_EXT2
159 select CMD_EXT4
160 select CMD_FAT
161 select CMD_FS_GENERIC
162 select CMD_PART if PARTITIONS
163 select CMD_PING if CMD_NET
164 select CMD_PXE if NET
165 select CMD_SYSBOOT
166 select ENV_VARS_UBOOT_CONFIG
167 select HUSH_PARSER
168 select SUPPORT_RAW_INITRD
169 select SYS_LONGHELP
170 imply CMD_MII if NET
171 imply USB_STORAGE
172 imply USE_BOOTCOMMAND
173 help
174 Select this to enable various options and commands which are suitable
175 for building u-boot for booting general purpose Linux distributions.
176
177config ENV_VARS_UBOOT_CONFIG
178 bool "Add arch, board, vendor and soc variables to default environment"
179 help
180 Define this in order to add variables describing the
181 U-Boot build configuration to the default environment.
182 These will be named arch, cpu, board, vendor, and soc.
183 Enabling this option will cause the following to be defined:
184 - CONFIG_SYS_ARCH
185 - CONFIG_SYS_CPU
186 - CONFIG_SYS_BOARD
187 - CONFIG_SYS_VENDOR
188 - CONFIG_SYS_SOC
189
190config NR_DRAM_BANKS
191 int "Number of DRAM banks"
192 default 1 if ARCH_SUNXI || ARCH_OWL
193 default 4
194 help
195 This defines the number of DRAM banks.
196
197config SYS_BOOT_GET_CMDLINE
198 bool "Enable kernel command line setup"
199 help
200 Enables allocating and saving kernel cmdline in space between
201 "bootm_low" and "bootm_low" + BOOTMAPSZ.
202
203config SYS_BOOT_GET_KBD
204 bool "Enable kernel board information setup"
205 help
206 Enables allocating and saving a kernel copy of the bd_info in
207 space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
208
209config SYS_MALLOC_F
210 bool "Enable malloc() pool before relocation"
211 default y if DM
212
213 help
214 Before relocation, memory is very limited on many platforms. Still,
215 we can provide a small malloc() pool if needed. Driver model in
216 particular needs this to operate, so that it can allocate the
217 initial serial device and any others that are needed.
218
219config SYS_MALLOC_F_LEN
220 hex "Size of malloc() pool before relocation"
221 depends on SYS_MALLOC_F
222 default 0x1000 if AM33XX
223 default 0x4000 if SANDBOX
224 default 0x2000 if (ARCH_IMX8 || ARCH_IMX8M || ARCH_MX7 || \
225 ARCH_MX7ULP || ARCH_MX6 || ARCH_MX5 || \
226 ARCH_LS1012A || ARCH_LS1021A || ARCH_LS1043A || \
227 ARCH_LS1046A || ARCH_QEMU || ARCH_SUNXI || ARCH_OWL)
228 default 0x400
229 help
230 Before relocation, memory is very limited on many platforms. Still,
231 we can provide a small malloc() pool if needed. Driver model in
232 particular needs this to operate, so that it can allocate the
233 initial serial device and any others that are needed.
234
235config SYS_MALLOC_LEN
236 hex "Define memory for Dynamic allocation"
237 depends on ARCH_ZYNQ || ARCH_VERSAL || ARCH_STM32MP || ARCH_ROCKCHIP
238 default 0x2000000 if ARCH_ROCKCHIP
239 help
240 This defines memory to be allocated for Dynamic allocation
241 TODO: Use for other architectures
242
243config SPL_SYS_MALLOC_F_LEN
244 hex "Size of malloc() pool in SPL"
245 depends on SYS_MALLOC_F && SPL
246 default 0x2800 if RCAR_GEN3
247 default SYS_MALLOC_F_LEN
248 help
249 In SPL memory is very limited on many platforms. Still,
250 we can provide a small malloc() pool if needed. Driver model in
251 particular needs this to operate, so that it can allocate the
252 initial serial device and any others that are needed.
253
254 It is possible to enable CONFIG_SYS_SPL_MALLOC_START to start a new
255 malloc() region in SDRAM once it is inited.
256
257config TPL_SYS_MALLOC_F_LEN
258 hex "Size of malloc() pool in TPL"
259 depends on SYS_MALLOC_F && TPL
260 default SPL_SYS_MALLOC_F_LEN
261 help
262 In TPL memory is very limited on many platforms. Still,
263 we can provide a small malloc() pool if needed. Driver model in
264 particular needs this to operate, so that it can allocate the
265 initial serial device and any others that are needed.
266
267menuconfig EXPERT
268 bool "Configure standard U-Boot features (expert users)"
269 default y
270 help
271 This option allows certain base U-Boot options and settings
272 to be disabled or tweaked. This is for specialized
273 environments which can tolerate a "non-standard" U-Boot.
274 Use this only if you really know what you are doing.
275
276if EXPERT
277 config SYS_MALLOC_CLEAR_ON_INIT
278 bool "Init with zeros the memory reserved for malloc (slow)"
279 default y
280 help
281 This setting is enabled by default. The reserved malloc
282 memory is initialized with zeros, so first malloc calls
283 will return the pointer to the zeroed memory. But this
284 slows the boot time.
285
286 It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
287 value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
288 Then the boot time can be significantly reduced.
289 Warning:
290 When disabling this, please check if malloc calls, maybe
291 should be replaced by calloc - if one expects zeroed memory.
292
293config SYS_MALLOC_DEFAULT_TO_INIT
294 bool "Default malloc to init while reserving the memory for it"
295 default n
296 help
297 It may happen that one needs to move the dynamic allocation
298 from one to another memory range, eg. when moving the malloc
299 from the limited static to a potentially large dynamic (DDR)
300 memory.
301
302 If so then on top of setting the updated memory aside one
303 needs to bring the malloc init.
304
305 If such a scenario is sought choose yes.
306
307config TOOLS_DEBUG
308 bool "Enable debug information for tools"
309 help
310 Enable generation of debug information for tools such as mkimage.
311 This can be used for debugging purposes. With debug information
312 it is possible to set breakpoints on particular lines, single-step
313 debug through the source code, etc.
314
315endif
316
317config PHYS_64BIT
318 bool "64bit physical address support"
319 help
320 Say Y here to support 64bit physical memory address.
321 This can be used not only for 64bit SoCs, but also for
322 large physical address extension on 32bit SoCs.
323
324config HAS_ROM
325 bool
326 select BINMAN
327 help
328 Enables building of a u-boot.rom target. This collects U-Boot and
329 any necessary binary blobs.
330
331config ROM_NEEDS_BLOBS
332 bool
333 depends on HAS_ROM
334 help
335 Enable this if building the u-boot.rom target needs binary blobs, and
336 so cannot be done normally. In this case, U-Boot will only build the
337 ROM if the required blobs exist. If not, you will see an warning like:
338
339 Image 'main-section' is missing external blobs and is non-functional:
340 intel-descriptor intel-me intel-refcode intel-vga intel-mrc
341
342config BUILD_ROM
343 bool "Build U-Boot as BIOS replacement"
344 depends on HAS_ROM
345 default y if !ROM_NEEDS_BLOBS
346 help
347 This option allows to build a ROM version of U-Boot.
348 The build process generally requires several binary blobs
349 which are not shipped in the U-Boot source tree.
350 Please, see doc/arch/x86.rst for details.
351
352config SPL_IMAGE
353 string "SPL image used in the combined SPL+U-Boot image"
354 default "spl/boot.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
355 default "spl/u-boot-spl.bin"
356 depends on SPL
357 help
358 Select the SPL build target that shall be generated by the SPL
359 build process (default spl/u-boot-spl.bin). This image will be
360 used to generate a combined image with SPL and main U-Boot
361 proper as one single image.
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 ERR_PTR_OFFSET
399 hex
400 default 0x0
401 help
402 Some U-Boot pointers have redundant information, so we can use a
403 scheme where we can return either an error code or a pointer with the
404 same return value. The default implementation just casts the pointer
405 to a number, however, this may fail on platforms where the end of the
406 address range is used for valid pointers (e.g. 0xffffff00 is a valid
407 heap pointer in socfpga SPL).
408 For such platforms, this value provides an upper range of those error
409 pointer values - up to 'MAX_ERRNO' bytes below this value must be
410 unused/invalid addresses.
411
412config PLATFORM_ELFENTRY
413 string
414 default "__start" if MIPS
415 default "_start"
416
417config STACK_SIZE
418 hex "Define max stack size that can be used by U-Boot"
419 default 0x4000000 if ARCH_VERSAL || ARCH_ZYNQMP
420 default 0x200000 if MICROBLAZE
421 default 0x1000000
422 help
423 Define Max stack size that can be used by U-Boot. This value is used
424 by the UEFI sub-system. On some boards initrd_high is calculated as
425 base stack pointer minus this stack size.
426
427config SYS_HAS_SRAM
428 bool
429 default y if TARGET_PIC32MZDASK
430 default y if TARGET_DEVKIT8000
431 default y if TARGET_TRICORDER
432 default n
433 help
434 Enable this to allow support for the on board SRAM.
435 SRAM base address is controlled by CONFIG_SYS_SRAM_BASE.
436 SRAM size is controlled by CONFIG_SYS_SRAM_SIZE.
437
438config SYS_SRAM_BASE
439 hex
440 default 0x80000000 if TARGET_PIC32MZDASK
441 default 0x40200000 if TARGET_DEVKIT8000
442 default 0x40200000 if TARGET_TRICORDER
443 default 0x0
444
445config SYS_SRAM_SIZE
446 hex
447 default 0x00080000 if TARGET_PIC32MZDASK
448 default 0x10000 if TARGET_DEVKIT8000
449 default 0x10000 if TARGET_TRICORDER
450 default 0x0
451
452config EXAMPLES
453 bool "Compile API examples"
454 depends on !SANDBOX
455 default y if ARCH_QEMU
456 help
457 U-Boot provides an API for standalone applications. Examples are
458 provided in directory examples/.
459
460endmenu
461
462source "api/Kconfig"
463
464source "common/Kconfig"
465
466source "cmd/Kconfig"
467
468source "disk/Kconfig"
469
470source "dts/Kconfig"
471
472source "env/Kconfig"
473
474source "net/Kconfig"
475
476source "drivers/Kconfig"
477
478source "fs/Kconfig"
479
480source "lib/Kconfig"
481
482source "test/Kconfig"
483
484source "tools/Kconfig"
485
