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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 0x4020000 if ARCH_SUNXI && !MACH_SUN8I_V3S
250 default 0x200000 if ARCH_BMIPS || X86
251 default 0x220000 if ARCH_SUNXI && MACH_SUN8I_V3S
252 default 0x400000
253 help
254 This defines memory to be allocated for Dynamic allocation
255 TODO: Use for other architectures
256
257config SPL_SYS_MALLOC_F_LEN
258 hex "Size of malloc() pool in SPL"
259 depends on SYS_MALLOC_F && SPL
260 default 0x2800 if RCAR_GEN3
261 default SYS_MALLOC_F_LEN
262 help
263 In SPL memory is very limited on many platforms. Still,
264 we can provide a small malloc() pool if needed. Driver model in
265 particular needs this to operate, so that it can allocate the
266 initial serial device and any others that are needed.
267
268 It is possible to enable CONFIG_SYS_SPL_MALLOC_START to start a new
269 malloc() region in SDRAM once it is inited.
270
271config TPL_SYS_MALLOC_F_LEN
272 hex "Size of malloc() pool in TPL"
273 depends on SYS_MALLOC_F && TPL
274 default SPL_SYS_MALLOC_F_LEN
275 help
276 In TPL memory is very limited on many platforms. Still,
277 we can provide a small malloc() pool if needed. Driver model in
278 particular needs this to operate, so that it can allocate the
279 initial serial device and any others that are needed.
280
281menuconfig EXPERT
282 bool "Configure standard U-Boot features (expert users)"
283 default y
284 help
285 This option allows certain base U-Boot options and settings
286 to be disabled or tweaked. This is for specialized
287 environments which can tolerate a "non-standard" U-Boot.
288 Use this only if you really know what you are doing.
289
290if EXPERT
291 config SYS_MALLOC_CLEAR_ON_INIT
292 bool "Init with zeros the memory reserved for malloc (slow)"
293 default y
294 help
295 This setting is enabled by default. The reserved malloc
296 memory is initialized with zeros, so first malloc calls
297 will return the pointer to the zeroed memory. But this
298 slows the boot time.
299
300 It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
301 value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
302 Then the boot time can be significantly reduced.
303 Warning:
304 When disabling this, please check if malloc calls, maybe
305 should be replaced by calloc - if one expects zeroed memory.
306
307config SYS_MALLOC_DEFAULT_TO_INIT
308 bool "Default malloc to init while reserving the memory for it"
309 help
310 It may happen that one needs to move the dynamic allocation
311 from one to another memory range, eg. when moving the malloc
312 from the limited static to a potentially large dynamic (DDR)
313 memory.
314
315 If so then on top of setting the updated memory aside one
316 needs to bring the malloc init.
317
318 If such a scenario is sought choose yes.
319
320config TOOLS_DEBUG
321 bool "Enable debug information for tools"
322 help
323 Enable generation of debug information for tools such as mkimage.
324 This can be used for debugging purposes. With debug information
325 it is possible to set breakpoints on particular lines, single-step
326 debug through the source code, etc.
327
328endif
329
330config PHYS_64BIT
331 bool "64bit physical address support"
332 help
333 Say Y here to support 64bit physical memory address.
334 This can be used not only for 64bit SoCs, but also for
335 large physical address extension on 32bit SoCs.
336
337config HAS_ROM
338 bool
339 select BINMAN
340 help
341 Enables building of a u-boot.rom target. This collects U-Boot and
342 any necessary binary blobs.
343
344config SPL_IMAGE
345 string "SPL image used in the combined SPL+U-Boot image"
346 default "spl/boot.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
347 default "spl/u-boot-spl.bin"
348 depends on SPL
349 help
350 Select the SPL build target that shall be generated by the SPL
351 build process (default spl/u-boot-spl.bin). This image will be
352 used to generate a combined image with SPL and main U-Boot
353 proper as one single image.
354
355config BUILD_TARGET
356 string "Build target special images"
357 default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_ARRIA10
358 default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_GEN5
359 default "u-boot-spl.kwb" if ARCH_MVEBU && SPL
360 default "u-boot-elf.srec" if RCAR_GEN3
361 default "u-boot.itb" if !BINMAN && SPL_LOAD_FIT && (ARCH_ROCKCHIP || \
362 ARCH_SUNXI || RISCV || ARCH_ZYNQMP)
363 default "u-boot.kwb" if ARCH_KIRKWOOD
364 default "u-boot-with-spl.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
365 default "u-boot-with-spl.imx" if ARCH_MX6 && SPL
366 help
367 Some SoCs need special image types (e.g. U-Boot binary
368 with a special header) as build targets. By defining
369 CONFIG_BUILD_TARGET in the SoC / board header, this
370 special image will be automatically built upon calling
371 make / buildman.
372
373config SYS_CUSTOM_LDSCRIPT
374 bool "Use a custom location for the U-Boot linker script"
375 help
376 Normally when linking U-Boot we will look in the board directory,
377 the CPU directory and finally the "cpu" directory of the architecture
378 for the ile "u-boot.lds" and use that as our linker. However, in
379 some cases we need to provide a different linker script. To do so,
380 enable this option and then provide the location under
381 CONFIG_SYS_LDSCRIPT.
382
383config SYS_LDSCRIPT
384 depends on SYS_CUSTOM_LDSCRIPT
385 string "Custom ldscript location"
386 help
387 Path within the source tree to the linker script to use for the
388 main U-Boot binary.
389
390config SYS_LOAD_ADDR
391 hex "Address in memory to use by default"
392 default 0x01000000 if ARCH_SOCFPGA
393 default 0x02000000 if PPC || X86
394 default 0x22000000 if MACH_SUN9I
395 default 0x42000000 if ARCH_SUNXI && !MACH_SUN9I
396 default 0x82000000 if ARCH_KEYSTONE || ARCH_OMAP2PLUS || ARCH_K3
397 default 0x82000000 if ARCH_MX6 && (MX6SL || MX6SLL || MX6SX || MX6UL || MX6ULL)
398 default 0x12000000 if ARCH_MX6 && !(MX6SL || MX6SLL || MX6SX || MX6UL || MX6ULL)
399 default 0x80800000 if ARCH_MX7
400 default 0x90000000 if FSL_LSCH2 || FSL_LSCH3
401 help
402 Address in memory to use as the default safe load address.
403
404config ERR_PTR_OFFSET
405 hex
406 default 0x0
407 help
408 Some U-Boot pointers have redundant information, so we can use a
409 scheme where we can return either an error code or a pointer with the
410 same return value. The default implementation just casts the pointer
411 to a number, however, this may fail on platforms where the end of the
412 address range is used for valid pointers (e.g. 0xffffff00 is a valid
413 heap pointer in socfpga SPL).
414 For such platforms, this value provides an upper range of those error
415 pointer values - up to 'MAX_ERRNO' bytes below this value must be
416 unused/invalid addresses.
417
418config PLATFORM_ELFENTRY
419 string
420 default "__start" if MIPS
421 default "_start"
422
423config STACK_SIZE
424 hex "Define max stack size that can be used by U-Boot"
425 default 0x4000000 if ARCH_VERSAL || ARCH_ZYNQMP
426 default 0x200000 if MICROBLAZE
427 default 0x1000000
428 help
429 Define Max stack size that can be used by U-Boot. This value is used
430 by the UEFI sub-system. On some boards initrd_high is calculated as
431 base stack pointer minus this stack size.
432
433config SYS_HAS_SRAM
434 bool
435 default y if TARGET_PIC32MZDASK
436 default y if TARGET_DEVKIT8000
437 default y if TARGET_TRICORDER
438 help
439 Enable this to allow support for the on board SRAM.
440 SRAM base address is controlled by CONFIG_SYS_SRAM_BASE.
441 SRAM size is controlled by CONFIG_SYS_SRAM_SIZE.
442
443config SYS_SRAM_BASE
444 hex
445 default 0x80000000 if TARGET_PIC32MZDASK
446 default 0x40200000 if TARGET_DEVKIT8000
447 default 0x40200000 if TARGET_TRICORDER
448 default 0x0
449
450config SYS_SRAM_SIZE
451 hex
452 default 0x00080000 if TARGET_PIC32MZDASK
453 default 0x10000 if TARGET_DEVKIT8000
454 default 0x10000 if TARGET_TRICORDER
455 default 0x0
456
457config EXAMPLES
458 bool "Compile API examples"
459 depends on !SANDBOX
460 default y if ARCH_QEMU
461 help
462 U-Boot provides an API for standalone applications. Examples are
463 provided in directory examples/.
464
465endmenu
466
467source "api/Kconfig"
468
469source "boot/Kconfig"
470
471source "common/Kconfig"
472
473source "cmd/Kconfig"
474
475source "disk/Kconfig"
476
477source "dts/Kconfig"
478
479source "env/Kconfig"
480
481source "net/Kconfig"
482
483source "drivers/Kconfig"
484
485source "fs/Kconfig"
486
487source "lib/Kconfig"
488
489source "test/Kconfig"
490
491source "tools/Kconfig"
492
