1# 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. 5# 6mainmenu "U-Boot $UBOOTVERSION Configuration" 7 8config UBOOTVERSION 9 string 10 option env="UBOOTVERSION" 11 12# Allow defaults in arch-specific code to override any given here 13source "arch/Kconfig" 14 15menu "General setup" 16 17config LOCALVERSION 18 string "Local version - append to U-Boot release" 19 help 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. 26 27config LOCALVERSION_AUTO 28 bool "Automatically append version information to the version string" 29 default y 30 help 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 33 top of tree revision. 34 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. 39 40 (The actual string used here is the first eight characters produced 41 by running the command: 42 43 $ git rev-parse --verify HEAD 44 45 which is done within the script "scripts/setlocalversion".) 46 47config CC_OPTIMIZE_FOR_SIZE 48 bool "Optimize for size" 49 default y 50 help 51 Enabling this option will pass "-Os" instead of "-O2" to gcc 52 resulting in a smaller U-Boot image. 53 54 This option is enabled by default for U-Boot. 55 56config DISTRO_DEFAULTS 57 bool "Select defaults suitable for booting general purpose Linux distributions" 58 default y if ARCH_SUNXI 59 default n 60 select CMD_BOOTZ 61 select CMD_DHCP 62 select CMD_EXT2 63 select CMD_EXT4 64 select CMD_FAT 65 select CMD_FS_GENERIC 66 select CMD_MII 67 select CMD_PING 68 select HUSH_PARSER 69 help 70 Select this to enable various options and commands which are suitable 71 for building u-boot for booting general purpose Linux distributions. 72 73config SYS_MALLOC_F 74 bool "Enable malloc() pool before relocation" 75 default y if DM 76 help 77 Before relocation, memory is very limited on many platforms. Still, 78 we can provide a small malloc() pool if needed. Driver model in 79 particular needs this to operate, so that it can allocate the 80 initial serial device and any others that are needed. 81 82config SYS_MALLOC_F_LEN 83 hex "Size of malloc() pool before relocation" 84 depends on SYS_MALLOC_F 85 default 0x400 86 help 87 Before relocation, memory is very limited on many platforms. Still, 88 we can provide a small malloc() pool if needed. Driver model in 89 particular needs this to operate, so that it can allocate the 90 initial serial device and any others that are needed. 91 92menuconfig EXPERT 93 bool "Configure standard U-Boot features (expert users)" 94 default y 95 help 96 This option allows certain base U-Boot options and settings 97 to be disabled or tweaked. This is for specialized 98 environments which can tolerate a "non-standard" U-Boot. 99 Use this only if you really know what you are doing. 100 101if EXPERT 102 config SYS_MALLOC_CLEAR_ON_INIT 103 bool "Init with zeros the memory reserved for malloc (slow)" 104 default y 105 help 106 This setting is enabled by default. The reserved malloc 107 memory is initialized with zeros, so first malloc calls 108 will return the pointer to the zeroed memory. But this 109 slows the boot time. 110 111 It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN 112 value, has more than few MiB, e.g. when uses bzip2 or bmp logo. 113 Then the boot time can be significantly reduced. 114 Warning: 115 When disabling this, please check if malloc calls, maybe 116 should be replaced by calloc - if one expects zeroed memory. 117endif 118endmenu # General setup 119 120menu "Boot images" 121 122config SUPPORT_SPL 123 bool 124 125config SUPPORT_TPL 126 bool 127 128config SPL 129 bool 130 depends on SUPPORT_SPL 131 prompt "Enable SPL" 132 help 133 If you want to build SPL as well as the normal image, say Y. 134 135config SPL_SYS_MALLOC_SIMPLE 136 bool 137 depends on SPL 138 prompt "Only use malloc_simple functions in the SPL" 139 help 140 Say Y here to only use the *_simple malloc functions from 141 malloc_simple.c, rather then using the versions from dlmalloc.c; 142 this will make the SPL binary smaller at the cost of more heap 143 usage as the *_simple malloc functions do not re-use free-ed mem. 144 145config SPL_STACK_R 146 depends on SPL 147 bool "Enable SDRAM location for SPL stack" 148 help 149 SPL starts off execution in SRAM and thus typically has only a small 150 stack available. Since SPL sets up DRAM while in its board_init_f() 151 function, it is possible for the stack to move there before 152 board_init_r() is reached. This option enables a special SDRAM 153 location for the SPL stack. U-Boot SPL switches to this after 154 board_init_f() completes, and before board_init_r() starts. 155 156config SPL_STACK_R_ADDR 157 depends on SPL_STACK_R 158 hex "SDRAM location for SPL stack" 159 help 160 Specify the address in SDRAM for the SPL stack. This will be set up 161 before board_init_r() is called. 162 163config SPL_STACK_R_MALLOC_SIMPLE_LEN 164 depends on SPL_STACK_R && SPL_SYS_MALLOC_SIMPLE 165 hex "Size of malloc_simple heap after switching to DRAM SPL stack" 166 default 0x100000 167 help 168 Specify the amount of the stack to use as memory pool for 169 malloc_simple after switching the stack to DRAM. This may be set 170 to give board_init_r() a larger heap then the initial heap in 171 SRAM which is limited to SYS_MALLOC_F_LEN bytes. 172 173config SPL_SEPARATE_BSS 174 depends on SPL 175 bool "BSS section is in a different memory region from text" 176 help 177 Some platforms need a large BSS region in SPL and can provide this 178 because RAM is already set up. In this case BSS can be moved to RAM. 179 This option should then be enabled so that the correct device tree 180 location is used. Normally we put the device tree at the end of BSS 181 but with this option enabled, it goes at _image_binary_end. 182 183config TPL 184 bool 185 depends on SPL && SUPPORT_TPL 186 prompt "Enable TPL" 187 help 188 If you want to build TPL as well as the normal image and SPL, say Y. 189 190config FIT 191 bool "Support Flattened Image Tree" 192 help 193 This option allows to boot the new uImage structrure, 194 Flattened Image Tree. FIT is formally a FDT, which can include 195 images of various types (kernel, FDT blob, ramdisk, etc.) 196 in a single blob. To boot this new uImage structure, 197 pass the address of the blob to the "bootm" command. 198 FIT is very flexible, supporting compression, multiple images, 199 multiple configurations, verification through hashing and also 200 verified boot (secure boot using RSA). This option enables that 201 feature. 202 203config SPL_FIT 204 bool "Support Flattened Image Tree within SPL" 205 depends on FIT 206 depends on SPL 207 208config FIT_VERBOSE 209 bool "Display verbose messages on FIT boot" 210 depends on FIT 211 212config FIT_SIGNATURE 213 bool "Enable signature verification of FIT uImages" 214 depends on FIT 215 depends on DM 216 select RSA 217 help 218 This option enables signature verification of FIT uImages, 219 using a hash signed and verified using RSA. If 220 CONFIG_SHA_PROG_HW_ACCEL is defined, i.e support for progressive 221 hashing is available using hardware, then then RSA library will use 222 it. See doc/uImage.FIT/signature.txt for more details. 223 224 WARNING: When relying on signed FIT images with a required signature 225 check the legacy image format is disabled by default, so that 226 unsigned images cannot be loaded. If a board needs the legacy image 227 format support in this case, enable it using 228 CONFIG_IMAGE_FORMAT_LEGACY. 229 230config SPL_FIT_SIGNATURE 231 bool "Enable signature verification of FIT firmware within SPL" 232 depends on SPL_FIT 233 depends on SPL_DM 234 select SPL_RSA 235 236config FIT_BEST_MATCH 237 bool "Select the best match for the kernel device tree" 238 depends on FIT 239 help 240 When no configuration is explicitly selected, default to the 241 one whose fdt's compatibility field best matches that of 242 U-Boot itself. A match is considered "best" if it matches the 243 most specific compatibility entry of U-Boot's fdt's root node. 244 The order of entries in the configuration's fdt is ignored. 245 246config FIT_VERBOSE 247 bool "Show verbose messages when FIT images fails" 248 depends on FIT 249 help 250 Generally a system will have valid FIT images so debug messages 251 are a waste of code space. If you are debugging your images then 252 you can enable this option to get more verbose information about 253 failures. 254 255config OF_BOARD_SETUP 256 bool "Set up board-specific details in device tree before boot" 257 depends on OF_LIBFDT 258 help 259 This causes U-Boot to call ft_board_setup() before booting into 260 the Operating System. This function can set up various 261 board-specific information in the device tree for use by the OS. 262 The device tree is then passed to the OS. 263 264config OF_SYSTEM_SETUP 265 bool "Set up system-specific details in device tree before boot" 266 depends on OF_LIBFDT 267 help 268 This causes U-Boot to call ft_system_setup() before booting into 269 the Operating System. This function can set up various 270 system-specific information in the device tree for use by the OS. 271 The device tree is then passed to the OS. 272 273config OF_STDOUT_VIA_ALIAS 274 bool "Update the device-tree stdout alias from U-Boot" 275 depends on OF_LIBFDT 276 help 277 This uses U-Boot's serial alias from the aliases node to update 278 the device tree passed to the OS. The "linux,stdout-path" property 279 in the chosen node is set to point to the correct serial node. 280 This option currently references CONFIG_CONS_INDEX, which is 281 incorrect when used with device tree as this option does not 282 exist / should not be used. 283 284config SYS_EXTRA_OPTIONS 285 string "Extra Options (DEPRECATED)" 286 help 287 The old configuration infrastructure (= mkconfig + boards.cfg) 288 provided the extra options field. If you have something like 289 "HAS_BAR,BAZ=64", the optional options 290 #define CONFIG_HAS 291 #define CONFIG_BAZ 64 292 will be defined in include/config.h. 293 This option was prepared for the smooth migration from the old 294 configuration to Kconfig. Since this option will be removed sometime, 295 new boards should not use this option. 296 297config SYS_TEXT_BASE 298 depends on SPARC || ARC || X86 || ARCH_UNIPHIER || ARCH_ZYNQMP || \ 299 (M68K && !TARGET_ASTRO_MCF5373L) || MICROBLAZE || MIPS 300 depends on !EFI_APP 301 hex "Text Base" 302 help 303 TODO: Move CONFIG_SYS_TEXT_BASE for all the architecture 304 305config SPL_LOAD_FIT 306 bool "Enable SPL loading U-Boot as a FIT" 307 depends on FIT 308 help 309 Normally with the SPL framework a legacy image is generated as part 310 of the build. This contains U-Boot along with information as to 311 where it should be loaded. This option instead enables generation 312 of a FIT (Flat Image Tree) which provides more flexibility. In 313 particular it can handle selecting from multiple device tree 314 and passing the correct one to U-Boot. 315 316config SYS_CLK_FREQ 317 depends on ARC || ARCH_SUNXI 318 int "CPU clock frequency" 319 help 320 TODO: Move CONFIG_SYS_CLK_FREQ for all the architecture 321 322endmenu # Boot images 323 324source "common/Kconfig" 325 326source "cmd/Kconfig" 327 328source "dts/Kconfig" 329 330source "net/Kconfig" 331 332source "drivers/Kconfig" 333 334source "fs/Kconfig" 335 336source "lib/Kconfig" 337 338source "test/Kconfig" 339