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"
10 option env="UBOOTVERSION"
12 # Allow defaults in arch-specific code to override any given here
18 string "Local version - append to U-Boot release"
20 Append an extra string to the end of your U-Boot version.
21 This will show up in your boot log, for example.
22 The string you set here will be appended after the contents of
23 any files with a filename matching localversion* in your
24 object and source tree, in that order. Your total string can
25 be a maximum of 64 characters.
27 config LOCALVERSION_AUTO
28 bool "Automatically append version information to the version string"
31 This will try to automatically determine if the current tree is a
32 release tree by looking for Git tags that belong to the current
35 A string of the format -gxxxxxxxx will be added to the localversion
36 if a Git-based tree is found. The string generated by this will be
37 appended after any matching localversion* files, and after the value
38 set in CONFIG_LOCALVERSION.
40 (The actual string used here is the first eight characters produced
41 by running the command:
43 $ git rev-parse --verify HEAD
45 which is done within the script "scripts/setlocalversion".)
47 config CC_OPTIMIZE_FOR_SIZE
48 bool "Optimize for size"
51 Enabling this option will pass "-Os" instead of "-O2" to gcc
52 resulting in a smaller U-Boot image.
54 This option is enabled by default for U-Boot.
57 bool "Enable malloc() pool before relocation"
60 Before relocation, memory is very limited on many platforms. Still,
61 we can provide a small malloc() pool if needed. Driver model in
62 particular needs this to operate, so that it can allocate the
63 initial serial device and any others that are needed.
65 config SYS_MALLOC_F_LEN
66 hex "Size of malloc() pool before relocation"
67 depends on SYS_MALLOC_F
70 Before relocation, memory is very limited on many platforms. Still,
71 we can provide a small malloc() pool if needed. Driver model in
72 particular needs this to operate, so that it can allocate the
73 initial serial device and any others that are needed.
76 bool "Configure standard U-Boot features (expert users)"
79 This option allows certain base U-Boot options and settings
80 to be disabled or tweaked. This is for specialized
81 environments which can tolerate a "non-standard" U-Boot.
82 Use this only if you really know what you are doing.
85 config SYS_MALLOC_CLEAR_ON_INIT
86 bool "Init with zeros the memory reserved for malloc (slow)"
89 This setting is enabled by default. The reserved malloc
90 memory is initialized with zeros, so first malloc calls
91 will return the pointer to the zeroed memory. But this
94 It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
95 value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
96 Then the boot time can be significantly reduced.
98 When disabling this, please check if malloc calls, maybe
99 should be replaced by calloc - if one expects zeroed memory.
101 endmenu # General setup
113 depends on SUPPORT_SPL
116 If you want to build SPL as well as the normal image, say Y.
118 config SPL_SYS_MALLOC_SIMPLE
121 prompt "Only use malloc_simple functions in the SPL"
123 Say Y here to only use the *_simple malloc functions from
124 malloc_simple.c, rather then using the versions from dlmalloc.c;
125 this will make the SPL binary smaller at the cost of more heap
126 usage as the *_simple malloc functions do not re-use free-ed mem.
130 bool "Enable SDRAM location for SPL stack"
132 SPL starts off execution in SRAM and thus typically has only a small
133 stack available. Since SPL sets up DRAM while in its board_init_f()
134 function, it is possible for the stack to move there before
135 board_init_r() is reached. This option enables a special SDRAM
136 location for the SPL stack. U-Boot SPL switches to this after
137 board_init_f() completes, and before board_init_r() starts.
139 config SPL_STACK_R_ADDR
140 depends on SPL_STACK_R
141 hex "SDRAM location for SPL stack"
143 Specify the address in SDRAM for the SPL stack. This will be set up
144 before board_init_r() is called.
146 config SPL_STACK_R_MALLOC_SIMPLE_LEN
147 depends on SPL_STACK_R && SPL_SYS_MALLOC_SIMPLE
148 hex "Size of malloc_simple heap after switching to DRAM SPL stack"
151 Specify the amount of the stack to use as memory pool for
152 malloc_simple after switching the stack to DRAM. This may be set
153 to give board_init_r() a larger heap then the initial heap in
154 SRAM which is limited to SYS_MALLOC_F_LEN bytes.
156 config SPL_SEPARATE_BSS
158 bool "BSS section is in a different memory region from text"
160 Some platforms need a large BSS region in SPL and can provide this
161 because RAM is already set up. In this case BSS can be moved to RAM.
162 This option should then be enabled so that the correct device tree
163 location is used. Normally we put the device tree at the end of BSS
164 but with this option enabled, it goes at _image_binary_end.
168 depends on SPL && SUPPORT_TPL
171 If you want to build TPL as well as the normal image and SPL, say Y.
174 bool "Support Flattened Image Tree"
176 This option allows to boot the new uImage structrure,
177 Flattened Image Tree. FIT is formally a FDT, which can include
178 images of various types (kernel, FDT blob, ramdisk, etc.)
179 in a single blob. To boot this new uImage structure,
180 pass the address of the blob to the "bootm" command.
181 FIT is very flexible, supporting compression, multiple images,
182 multiple configurations, verification through hashing and also
183 verified boot (secure boot using RSA). This option enables that
187 bool "Display verbose messages on FIT boot"
191 bool "Enable signature verification of FIT uImages"
196 This option enables signature verification of FIT uImages,
197 using a hash signed and verified using RSA. If
198 CONFIG_SHA_PROG_HW_ACCEL is defined, i.e support for progressive
199 hashing is available using hardware, then then RSA library will use
200 it. See doc/uImage.FIT/signature.txt for more details.
202 WARNING: When relying on signed FIT images with a required signature
203 check the legacy image format is disabled by default, so that
204 unsigned images cannot be loaded. If a board needs the legacy image
205 format support in this case, enable it using
206 CONFIG_IMAGE_FORMAT_LEGACY.
208 config FIT_BEST_MATCH
209 bool "Select the best match for the kernel device tree"
212 When no configuration is explicitly selected, default to the
213 one whose fdt's compatibility field best matches that of
214 U-Boot itself. A match is considered "best" if it matches the
215 most specific compatibility entry of U-Boot's fdt's root node.
216 The order of entries in the configuration's fdt is ignored.
219 bool "Show verbose messages when FIT images fails"
222 Generally a system will have valid FIT images so debug messages
223 are a waste of code space. If you are debugging your images then
224 you can enable this option to get more verbose information about
227 config OF_BOARD_SETUP
228 bool "Set up board-specific details in device tree before boot"
231 This causes U-Boot to call ft_board_setup() before booting into
232 the Operating System. This function can set up various
233 board-specific information in the device tree for use by the OS.
234 The device tree is then passed to the OS.
236 config OF_SYSTEM_SETUP
237 bool "Set up system-specific details in device tree before boot"
240 This causes U-Boot to call ft_system_setup() before booting into
241 the Operating System. This function can set up various
242 system-specific information in the device tree for use by the OS.
243 The device tree is then passed to the OS.
245 config OF_STDOUT_VIA_ALIAS
246 bool "Update the device-tree stdout alias from U-Boot"
249 This uses U-Boot's serial alias from the aliases node to update
250 the device tree passed to the OS. The "linux,stdout-path" property
251 in the chosen node is set to point to the correct serial node.
252 This option currently references CONFIG_CONS_INDEX, which is
253 incorrect when used with device tree as this option does not
254 exist / should not be used.
256 config SYS_EXTRA_OPTIONS
257 string "Extra Options (DEPRECATED)"
259 The old configuration infrastructure (= mkconfig + boards.cfg)
260 provided the extra options field. If you have something like
261 "HAS_BAR,BAZ=64", the optional options
263 #define CONFIG_BAZ 64
264 will be defined in include/config.h.
265 This option was prepared for the smooth migration from the old
266 configuration to Kconfig. Since this option will be removed sometime,
267 new boards should not use this option.
270 depends on SPARC || ARC || X86 || ARCH_UNIPHIER || ARCH_ZYNQMP || \
271 (M68K && !TARGET_ASTRO_MCF5373L) || MICROBLAZE
275 TODO: Move CONFIG_SYS_TEXT_BASE for all the architecture
278 bool "Enable SPL loading U-Boot as a FIT"
281 Normally with the SPL framework a legacy image is generated as part
282 of the build. This contains U-Boot along with information as to
283 where it should be loaded. This option instead enables generation
284 of a FIT (Flat Image Tree) which provides more flexibility. In
285 particular it can handle selecting from multiple device tree
286 and passing the correct one to U-Boot.
289 depends on ARC || ARCH_SUNXI
290 int "CPU clock frequency"
292 TODO: Move CONFIG_SYS_CLK_FREQ for all the architecture
294 endmenu # Boot images
296 source "common/Kconfig"
304 source "drivers/Kconfig"
310 source "test/Kconfig"