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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 default n
87 help
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
91 reasons.
92
93config SPL_OPTIMIZE_INLINING
94 bool "Allow compiler to uninline functions marked 'inline' in SPL"
95 depends on SPL
96 default n
97 help
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
101 reasons.
102
103config ARCH_SUPPORTS_LTO
104 bool
105
106config LTO
107 bool "Enable Link Time Optimizations"
108 depends on ARCH_SUPPORTS_LTO
109 default n
110 help
111 This option enables Link Time Optimization (LTO), a mechanism which
112 allows the compiler to optimize between different compilation units.
113
114 This can optimize away dead code paths, resulting in smaller binary
115 size (if CC_OPTIMIZE_FOR_SIZE is enabled).
116
117 This option is not available for every architecture and may
118 introduce bugs.
119
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
123 nproc command).
124
125 If unsure, say n.
126
127config TPL_OPTIMIZE_INLINING
128 bool "Allow compiler to uninline functions marked 'inline' in TPL"
129 depends on TPL
130 default n
131 help
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
135 reasons.
136
137config CC_COVERAGE
138 bool "Enable code coverage analysis"
139 depends on SANDBOX
140 help
141 Enabling this option will pass "--coverage" to gcc to compile
142 and link code instrumented for coverage analysis.
143
144config CC_HAS_ASM_INLINE
145 def_bool $(success,echo 'void foo(void) { asm inline (""); }' | $(CC) -x c - -c -o /dev/null)
146
147config XEN
148 bool "Select U-Boot be run as a bootloader for XEN Virtual Machine"
149 help
150 Enabling this option will make U-Boot be run as a bootloader
151 for XEN [1] Virtual Machine.
152
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.
162
163 [1] - https://xenproject.org/
164
165config DISTRO_DEFAULTS
166 bool "Select defaults suitable for booting general purpose Linux distributions"
167 select AUTO_COMPLETE
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
173 select CMD_EXT2
174 select CMD_EXT4
175 select CMD_FAT
176 select CMD_FS_GENERIC
177 select CMD_PART if PARTITIONS
178 select CMD_PING if CMD_NET
179 select CMD_PXE if NET
180 select CMD_SYSBOOT
181 select ENV_VARS_UBOOT_CONFIG
182 select HUSH_PARSER
183 select SUPPORT_RAW_INITRD
184 select SYS_LONGHELP
185 imply CMD_MII if NET
186 imply USB_STORAGE
187 imply USE_BOOTCOMMAND
188 help
189 Select this to enable various options and commands which are suitable
190 for building u-boot for booting general purpose Linux distributions.
191
192config ENV_VARS_UBOOT_CONFIG
193 bool "Add arch, board, vendor and soc variables to default environment"
194 help
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:
199 - CONFIG_SYS_ARCH
200 - CONFIG_SYS_CPU
201 - CONFIG_SYS_BOARD
202 - CONFIG_SYS_VENDOR
203 - CONFIG_SYS_SOC
204
205config NR_DRAM_BANKS
206 int "Number of DRAM banks"
207 default 1 if ARCH_SUNXI || ARCH_OWL
208 default 4
209 help
210 This defines the number of DRAM banks.
211
212config SYS_BOOT_GET_CMDLINE
213 bool "Enable kernel command line setup"
214 help
215 Enables allocating and saving kernel cmdline in space between
216 "bootm_low" and "bootm_low" + BOOTMAPSZ.
217
218config SYS_BOOT_GET_KBD
219 bool "Enable kernel board information setup"
220 help
221 Enables allocating and saving a kernel copy of the bd_info in
222 space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
223
224config SYS_MALLOC_F
225 bool "Enable malloc() pool before relocation"
226 default y if DM
227
228 help
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.
233
234config 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)
243 default 0x400
244 help
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.
249
250config 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
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 default n
311 help
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)
315 memory.
316
317 If so then on top of setting the updated memory aside one
318 needs to bring the malloc init.
319
320 If such a scenario is sought choose yes.
321
322config TOOLS_DEBUG
323 bool "Enable debug information for tools"
324 help
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.
329
330endif
331
332config PHYS_64BIT
333 bool "64bit physical address support"
334 help
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.
338
339config HAS_ROM
340 bool
341 select BINMAN
342 help
343 Enables building of a u-boot.rom target. This collects U-Boot and
344 any necessary binary blobs.
345
346config SPL_IMAGE
347 string "SPL image used in the combined SPL+U-Boot image"
348 default "spl/boot.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
349 default "spl/u-boot-spl.bin"
350 depends on SPL
351 help
352 Select the SPL build target that shall be generated by the SPL
353 build process (default spl/u-boot-spl.bin). This image will be
354 used to generate a combined image with SPL and main U-Boot
355 proper as one single image.
356
357config BUILD_TARGET
358 string "Build target special images"
359 default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_ARRIA10
360 default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_GEN5
361 default "u-boot-spl.kwb" if ARCH_MVEBU && SPL
362 default "u-boot-elf.srec" if RCAR_GEN3
363 default "u-boot.itb" if !BINMAN && SPL_LOAD_FIT && (ARCH_ROCKCHIP || \
364 ARCH_SUNXI || RISCV || ARCH_ZYNQMP)
365 default "u-boot.kwb" if ARCH_KIRKWOOD
366 default "u-boot-with-spl.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
367 default "u-boot-with-spl.imx" if ARCH_MX6 && SPL
368 help
369 Some SoCs need special image types (e.g. U-Boot binary
370 with a special header) as build targets. By defining
371 CONFIG_BUILD_TARGET in the SoC / board header, this
372 special image will be automatically built upon calling
373 make / buildman.
374
375config SYS_CUSTOM_LDSCRIPT
376 bool "Use a custom location for the U-Boot linker script"
377 help
378 Normally when linking U-Boot we will look in the board directory,
379 the CPU directory and finally the "cpu" directory of the architecture
380 for the ile "u-boot.lds" and use that as our linker. However, in
381 some cases we need to provide a different linker script. To do so,
382 enable this option and then provide the location under
383 CONFIG_SYS_LDSCRIPT.
384
385config SYS_LDSCRIPT
386 depends on SYS_CUSTOM_LDSCRIPT
387 string "Custom ldscript location"
388 help
389 Path within the source tree to the linker script to use for the
390 main U-Boot binary.
391
392config ERR_PTR_OFFSET
393 hex
394 default 0x0
395 help
396 Some U-Boot pointers have redundant information, so we can use a
397 scheme where we can return either an error code or a pointer with the
398 same return value. The default implementation just casts the pointer
399 to a number, however, this may fail on platforms where the end of the
400 address range is used for valid pointers (e.g. 0xffffff00 is a valid
401 heap pointer in socfpga SPL).
402 For such platforms, this value provides an upper range of those error
403 pointer values - up to 'MAX_ERRNO' bytes below this value must be
404 unused/invalid addresses.
405
406config PLATFORM_ELFENTRY
407 string
408 default "__start" if MIPS
409 default "_start"
410
411config STACK_SIZE
412 hex "Define max stack size that can be used by U-Boot"
413 default 0x4000000 if ARCH_VERSAL || ARCH_ZYNQMP
414 default 0x200000 if MICROBLAZE
415 default 0x1000000
416 help
417 Define Max stack size that can be used by U-Boot. This value is used
418 by the UEFI sub-system. On some boards initrd_high is calculated as
419 base stack pointer minus this stack size.
420
421config SYS_HAS_SRAM
422 bool
423 default y if TARGET_PIC32MZDASK
424 default y if TARGET_DEVKIT8000
425 default y if TARGET_TRICORDER
426 default n
427 help
428 Enable this to allow support for the on board SRAM.
429 SRAM base address is controlled by CONFIG_SYS_SRAM_BASE.
430 SRAM size is controlled by CONFIG_SYS_SRAM_SIZE.
431
432config SYS_SRAM_BASE
433 hex
434 default 0x80000000 if TARGET_PIC32MZDASK
435 default 0x40200000 if TARGET_DEVKIT8000
436 default 0x40200000 if TARGET_TRICORDER
437 default 0x0
438
439config SYS_SRAM_SIZE
440 hex
441 default 0x00080000 if TARGET_PIC32MZDASK
442 default 0x10000 if TARGET_DEVKIT8000
443 default 0x10000 if TARGET_TRICORDER
444 default 0x0
445
446config EXAMPLES
447 bool "Compile API examples"
448 depends on !SANDBOX
449 default y if ARCH_QEMU
450 help
451 U-Boot provides an API for standalone applications. Examples are
452 provided in directory examples/.
453
454endmenu
455
456source "api/Kconfig"
457
458source "common/Kconfig"
459
460source "cmd/Kconfig"
461
462source "disk/Kconfig"
463
464source "dts/Kconfig"
465
466source "env/Kconfig"
467
468source "net/Kconfig"
469
470source "drivers/Kconfig"
471
472source "fs/Kconfig"
473
474source "lib/Kconfig"
475
476source "test/Kconfig"
477
478source "tools/Kconfig"
479
