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 SYS_MALLOC_F 57 bool "Enable malloc() pool before relocation" 58 default y if DM 59 help 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. 64 65config SYS_MALLOC_F_LEN 66 hex "Size of malloc() pool before relocation" 67 depends on SYS_MALLOC_F 68 default 0x400 69 help 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. 74 75menuconfig EXPERT 76 bool "Configure standard U-Boot features (expert users)" 77 default y 78 help 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. 83 84if EXPERT 85 config SYS_MALLOC_CLEAR_ON_INIT 86 bool "Init with zeros the memory reserved for malloc (slow)" 87 default y 88 help 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 92 slows the boot time. 93 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. 97 Warning: 98 When disabling this, please check if malloc calls, maybe 99 should be replaced by calloc - if one expects zeroed memory. 100endif 101endmenu # General setup 102 103menu "Boot images" 104 105config SUPPORT_SPL 106 bool 107 108config SUPPORT_TPL 109 bool 110 111config SPL 112 bool 113 depends on SUPPORT_SPL 114 prompt "Enable SPL" 115 help 116 If you want to build SPL as well as the normal image, say Y. 117 118config SPL_SYS_MALLOC_SIMPLE 119 bool 120 depends on SPL 121 prompt "Only use malloc_simple functions in the SPL" 122 help 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. 127 128config SPL_STACK_R 129 depends on SPL 130 bool "Enable SDRAM location for SPL stack" 131 help 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. 138 139config SPL_STACK_R_ADDR 140 depends on SPL_STACK_R 141 hex "SDRAM location for SPL stack" 142 help 143 Specify the address in SDRAM for the SPL stack. This will be set up 144 before board_init_r() is called. 145 146config 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" 149 default 0x100000 150 help 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. 155 156config SPL_SEPARATE_BSS 157 depends on SPL 158 bool "BSS section is in a different memory region from text" 159 help 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. 165 166config TPL 167 bool 168 depends on SPL && SUPPORT_TPL 169 prompt "Enable TPL" 170 help 171 If you want to build TPL as well as the normal image and SPL, say Y. 172 173config FIT 174 bool "Support Flattened Image Tree" 175 help 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 184 feature. 185 186config FIT_VERBOSE 187 bool "Display verbose messages on FIT boot" 188 depends on FIT 189 190config FIT_SIGNATURE 191 bool "Enable signature verification of FIT uImages" 192 depends on FIT 193 depends on DM 194 select RSA 195 help 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. 201 202 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. 207 208config FIT_BEST_MATCH 209 bool "Select the best match for the kernel device tree" 210 depends on FIT 211 help 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. 217 218config FIT_VERBOSE 219 bool "Show verbose messages when FIT images fails" 220 depends on FIT 221 help 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 225 failures. 226 227config OF_BOARD_SETUP 228 bool "Set up board-specific details in device tree before boot" 229 depends on OF_LIBFDT 230 help 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. 235 236config OF_SYSTEM_SETUP 237 bool "Set up system-specific details in device tree before boot" 238 depends on OF_LIBFDT 239 help 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. 244 245config OF_STDOUT_VIA_ALIAS 246 bool "Update the device-tree stdout alias from U-Boot" 247 depends on OF_LIBFDT 248 help 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. 255 256config SYS_EXTRA_OPTIONS 257 string "Extra Options (DEPRECATED)" 258 help 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 262 #define CONFIG_HAS 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. 268 269config SYS_TEXT_BASE 270 depends on SPARC || ARC || X86 || ARCH_UNIPHIER || ARCH_ZYNQMP || \ 271 (M68K && !TARGET_ASTRO_MCF5373L) || MICROBLAZE || MIPS 272 depends on !EFI_APP 273 hex "Text Base" 274 help 275 TODO: Move CONFIG_SYS_TEXT_BASE for all the architecture 276 277config SPL_LOAD_FIT 278 bool "Enable SPL loading U-Boot as a FIT" 279 depends on FIT 280 help 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. 287 288config SYS_CLK_FREQ 289 depends on ARC || ARCH_SUNXI 290 int "CPU clock frequency" 291 help 292 TODO: Move CONFIG_SYS_CLK_FREQ for all the architecture 293 294endmenu # Boot images 295 296source "common/Kconfig" 297 298source "cmd/Kconfig" 299 300source "dts/Kconfig" 301 302source "net/Kconfig" 303 304source "drivers/Kconfig" 305 306source "fs/Kconfig" 307 308source "lib/Kconfig" 309 310source "test/Kconfig" 311