1# 2# For a description of the syntax of this configuration file, 3# see Documentation/kbuild/kconfig-language.txt. 4# 5mainmenu "U-Boot $UBOOTVERSION Configuration" 6 7config UBOOTVERSION 8 string 9 option env="UBOOTVERSION" 10 11# Allow defaults in arch-specific code to override any given here 12source "arch/Kconfig" 13 14menu "General setup" 15 16config LOCALVERSION 17 string "Local version - append to U-Boot release" 18 help 19 Append an extra string to the end of your U-Boot version. 20 This will show up on your boot log, for example. 21 The string you set here will be appended after the contents of 22 any files with a filename matching localversion* in your 23 object and source tree, in that order. Your total string can 24 be a maximum of 64 characters. 25 26config LOCALVERSION_AUTO 27 bool "Automatically append version information to the version string" 28 default y 29 help 30 This will try to automatically determine if the current tree is a 31 release tree by looking for git tags that belong to the current 32 top of tree revision. 33 34 A string of the format -gxxxxxxxx will be added to the localversion 35 if a git-based tree is found. The string generated by this will be 36 appended after any matching localversion* files, and after the value 37 set in CONFIG_LOCALVERSION. 38 39 (The actual string used here is the first eight characters produced 40 by running the command: 41 42 $ git rev-parse --verify HEAD 43 44 which is done within the script "scripts/setlocalversion".) 45 46config CC_OPTIMIZE_FOR_SIZE 47 bool "Optimize for size" 48 default y 49 help 50 Enabling this option will pass "-Os" instead of "-O2" to gcc 51 resulting in a smaller U-Boot image. 52 53 This option is enabled by default for U-Boot. 54 55config SYS_MALLOC_F 56 bool "Enable malloc() pool before relocation" 57 default y if DM 58 help 59 Before relocation memory is very limited on many platforms. Still, 60 we can provide a small malloc() pool if needed. Driver model in 61 particular needs this to operate, so that it can allocate the 62 initial serial device and any others that are needed. 63 64config SYS_MALLOC_F_LEN 65 hex "Size of malloc() pool before relocation" 66 depends on SYS_MALLOC_F 67 default 0x400 68 help 69 Before relocation memory is very limited on many platforms. Still, 70 we can provide a small malloc() pool if needed. Driver model in 71 particular needs this to operate, so that it can allocate the 72 initial serial device and any others that are needed. 73 74menuconfig EXPERT 75 bool "Configure standard U-Boot features (expert users)" 76 default y 77 help 78 This option allows certain base U-Boot options and settings 79 to be disabled or tweaked. This is for specialized 80 environments which can tolerate a "non-standard" U-Boot. 81 Only use this if you really know what you are doing. 82 83if EXPERT 84 config SYS_MALLOC_CLEAR_ON_INIT 85 bool "Init with zeros the memory reserved for malloc (slow)" 86 default y 87 help 88 This setting is enabled by default. The reserved malloc 89 memory is initialized with zeros, so first malloc calls 90 will return the pointer to the zeroed memory. But this 91 slows the boot time. 92 93 It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN 94 value, has more than few MiB, e.g. when uses bzip2 or bmp logo. 95 Then the boot time can be significantly reduced. 96 Warning: 97 When disabling this, please check if malloc calls, maybe 98 should be replaced by calloc - if expects zeroed memory. 99endif 100endmenu # General setup 101 102menu "Boot images" 103 104config SUPPORT_SPL 105 bool 106 107config SUPPORT_TPL 108 bool 109 110config SPL 111 bool 112 depends on SUPPORT_SPL 113 prompt "Enable SPL" 114 help 115 If you want to build SPL as well as the normal image, say Y. 116 117config SPL_SYS_MALLOC_SIMPLE 118 bool 119 depends on SPL 120 prompt "Only use malloc_simple functions in the spl" 121 help 122 Say Y here to only use the *_simple malloc functions from 123 malloc_simple.c, rather then using the versions from dlmalloc.c 124 this will make the SPL binary smaller at the cost of more heap 125 usage as the *_simple malloc functions do not re-use free-ed mem. 126 127config SPL_STACK_R 128 depends on SPL 129 bool "Enable SDRAM location for SPL stack" 130 help 131 SPL starts off execution in SRAM and thus typically has only a small 132 stack available. Since SPL sets up DRAM while in its board_init_f() 133 function, it is possible for the stack to move there before 134 board_init_r() is reached. This option enables a special SDRAM 135 location for the SPL stack. U-Boot SPL switches to this after 136 board_init_f() completes, and before board_init_r() starts. 137 138config SPL_STACK_R_ADDR 139 depends on SPL_STACK_R 140 hex "SDRAM location for SPL stack" 141 help 142 Specify the address in SDRAM for the SPL stack. This will be set up 143 before board_init_r() is called. 144 145config SPL_STACK_R_MALLOC_SIMPLE_LEN 146 depends on SPL_STACK_R && SPL_SYS_MALLOC_SIMPLE 147 hex "Size of malloc_simple heap after switching to DRAM SPL stack" 148 default 0x100000 149 help 150 Specify the amount of the stack to use as memory pool for 151 malloc_simple after switching the stack to DRAM. This may be set 152 to give board_init_r() a larger heap then the initial heap in 153 SRAM which is limited to SYS_MALLOC_F_LEN bytes. 154 155config SPL_SEPARATE_BSS 156 depends on SPL 157 bool "BSS section is in a different memory region from text" 158 help 159 Some platforms need a large BSS region in SPL and can provide this 160 because RAM is already set up. In this case BSS can be moved to RAM. 161 This option should then be enabled so that the correct device tree 162 location is used. Normally we put the device tree at the end of BSS 163 but with this option enabled, it goes at _image_binary_end. 164 165config TPL 166 bool 167 depends on SPL && SUPPORT_TPL 168 prompt "Enable TPL" 169 help 170 If you want to build TPL as well as the normal image and SPL, say Y. 171 172config FIT 173 bool "Support Flattened Image Tree" 174 help 175 This option allows to boot the new uImage structrure, 176 Flattened Image Tree. FIT is formally a FDT, which can include 177 images of various types (kernel, FDT blob, ramdisk, etc.) 178 in a single blob. To boot this new uImage structure, 179 pass the address of the blob to the "bootm" command. 180 FIT is very flexible, supporting compression, multiple images, 181 multiple configurations, verification through hashing and also 182 verified boot (secure boot using RSA). This option enables that 183 feature. 184 185config FIT_VERBOSE 186 bool "Display verbose messages on FIT boot" 187 depends on FIT 188 189config FIT_SIGNATURE 190 bool "Enable signature verification of FIT uImages" 191 depends on FIT 192 depends on DM 193 select RSA 194 help 195 This option enables signature verification of FIT uImages, 196 using a hash signed and verified using RSA. If 197 CONFIG_SHA_PROG_HW_ACCEL is defined, i.e support for progressive 198 hashing is available using hardware, then then RSA library will use 199 it. See doc/uImage.FIT/signature.txt for more details. 200 201 WARNING: When relying on signed FIT images with a required signature 202 check the legacy image format is disabled by default, so that 203 unsigned images cannot be loaded. If a board needs the legacy image 204 format support in this case, enable it using 205 CONFIG_IMAGE_FORMAT_LEGACY. 206 207config FIT_BEST_MATCH 208 bool "Select the best match for the kernel device tree" 209 depends on FIT 210 help 211 When no configuration is explicitly selected, default to the 212 one whose fdt's compatibility field best matches that of 213 U-Boot itself. A match is considered "best" if it matches the 214 most specific compatibility entry of U-Boot's fdt's root node. 215 The order of entries in the configuration's fdt is ignored. 216 217config FIT_VERBOSE 218 bool "Show verbose messages when FIT images fails" 219 depends on FIT 220 help 221 Generally a system will have valid FIT images so debug messages 222 are a waste of code space. If you are debugging your images then 223 you can enable this option to get more verbose information about 224 failures. 225 226config OF_BOARD_SETUP 227 bool "Set up board-specific details in device tree before boot" 228 depends on OF_LIBFDT 229 help 230 This causes U-Boot to call ft_board_setup() before booting into 231 the Operating System. This function can set up various 232 board-specific information in the device tree for use by the OS. 233 The device tree is then passed to the OS. 234 235config OF_SYSTEM_SETUP 236 bool "Set up system-specific details in device tree before boot" 237 depends on OF_LIBFDT 238 help 239 This causes U-Boot to call ft_system_setup() before booting into 240 the Operating System. This function can set up various 241 system-specific information in the device tree for use by the OS. 242 The device tree is then passed to the OS. 243 244config OF_STDOUT_VIA_ALIAS 245 bool "Update the device-tree stdout alias from U-Boot" 246 depends on OF_LIBFDT 247 help 248 This uses U-Boot's serial alias from the aliases node to update 249 the device tree passed to the OS. The "linux,stdout-path" property 250 in the chosen node is set to point to the correct serial node. 251 This option currently references CONFIG_CONS_INDEX, which is 252 incorrect when used with device tree as this option does not 253 exist / should not be used. 254 255config SYS_EXTRA_OPTIONS 256 string "Extra Options (DEPRECATED)" 257 help 258 The old configuration infrastructure (= mkconfig + boards.cfg) 259 provided the extra options field. If you have something like 260 "HAS_BAR,BAZ=64", the optional options 261 #define CONFIG_HAS 262 #define CONFIG_BAZ 64 263 will be defined in include/config.h. 264 This option was prepared for the smooth migration from the old 265 configuration to Kconfig. Since this option will be removed sometime, 266 new boards should not use this option. 267 268config SYS_TEXT_BASE 269 depends on SPARC || ARC || X86 || ARCH_UNIPHIER || ARCH_ZYNQMP || \ 270 (M68K && !TARGET_ASTRO_MCF5373L) || MICROBLAZE 271 depends on !EFI_APP 272 hex "Text Base" 273 help 274 TODO: Move CONFIG_SYS_TEXT_BASE for all the architecture 275 276config SPL_LOAD_FIT 277 bool "Enable SPL loading U-Boot as a FIT" 278 depends on FIT 279 help 280 Normally with the SPL framework a legacy image is generated as part 281 of the build. This contains U-Boot along with information as to 282 where it should be loaded. This option instead enables generation 283 of a FIT (Flat Image Tree) which provides more flexibility. In 284 particular it can handle selecting from multiple device tree 285 and passing the correct one to U-Boot. 286 287config SYS_CLK_FREQ 288 depends on ARC || ARCH_SUNXI 289 int "CPU clock frequency" 290 help 291 TODO: Move CONFIG_SYS_CLK_FREQ for all the architecture 292 293endmenu # Boot images 294 295source "common/Kconfig" 296 297source "cmd/Kconfig" 298 299source "dts/Kconfig" 300 301source "net/Kconfig" 302 303source "drivers/Kconfig" 304 305source "fs/Kconfig" 306 307source "lib/Kconfig" 308 309source "test/Kconfig" 310