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 8comment "Compiler: $(CC_VERSION_TEXT)" 9 10source "scripts/Kconfig.include" 11 12# Allow defaults in arch-specific code to override any given here 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_OPTIMIZE_FOR_SIZE 61 bool "Optimize for size" 62 default y 63 help 64 Enabling this option will pass "-Os" instead of "-O2" to gcc 65 resulting in a smaller U-Boot image. 66 67 This option is enabled by default for U-Boot. 68 69config OPTIMIZE_INLINING 70 bool "Allow compiler to uninline functions marked 'inline' in full U-Boot" 71 default n 72 help 73 This option determines if U-Boot forces gcc to inline the functions 74 developers have marked 'inline'. Doing so takes away freedom from gcc to 75 do what it thinks is best, which is desirable in some cases for size 76 reasons. 77 78config SPL_OPTIMIZE_INLINING 79 bool "Allow compiler to uninline functions marked 'inline' in SPL" 80 depends on SPL 81 default n 82 help 83 This option determines if U-Boot forces gcc to inline the functions 84 developers have marked 'inline'. Doing so takes away freedom from gcc to 85 do what it thinks is best, which is desirable in some cases for size 86 reasons. 87 88config ARCH_SUPPORTS_LTO 89 bool 90 91config LTO 92 bool "Enable Link Time Optimizations" 93 depends on ARCH_SUPPORTS_LTO 94 default n 95 help 96 This option enables Link Time Optimization (LTO), a mechanism which 97 allows the compiler to optimize between different compilation units. 98 99 This can optimize away dead code paths, resulting in smaller binary 100 size (if CC_OPTIMIZE_FOR_SIZE is enabled). 101 102 This option is not available for every architecture and may 103 introduce bugs. 104 105 Currently, when compiling with GCC, due to a weird bug regarding 106 jobserver, the final linking will not respect make's --jobs argument. 107 Instead all available processors will be used (as reported by the 108 nproc command). 109 110 If unsure, say n. 111 112config TPL_OPTIMIZE_INLINING 113 bool "Allow compiler to uninline functions marked 'inline' in TPL" 114 depends on TPL 115 default n 116 help 117 This option determines if U-Boot forces gcc to inline the functions 118 developers have marked 'inline'. Doing so takes away freedom from gcc to 119 do what it thinks is best, which is desirable in some cases for size 120 reasons. 121 122config CC_COVERAGE 123 bool "Enable code coverage analysis" 124 depends on SANDBOX 125 help 126 Enabling this option will pass "--coverage" to gcc to compile 127 and link code instrumented for coverage analysis. 128 129config CC_HAS_ASM_INLINE 130 def_bool $(success,echo 'void foo(void) { asm inline (""); }' | $(CC) -x c - -c -o /dev/null) 131 132config XEN 133 bool "Select U-Boot be run as a bootloader for XEN Virtual Machine" 134 help 135 Enabling this option will make U-Boot be run as a bootloader 136 for XEN [1] Virtual Machine. 137 138 Xen is a virtual machine monitor (VMM) or a type-1 hypervisor with support 139 for para-virtualization. Xen can organize the safe execution of several 140 virtual machines on the same physical system with performance close to 141 native. It is used as the basis for a number of different commercial and 142 open source applications, such as: server virtualization, Infrastructure 143 as a Service (IaaS), desktop virtualization, security applications, 144 embedded and hardware appliances. 145 Xen has a special VM called Domain-0 that runs the Dom0 kernel and allows 146 Xen to use the device drivers for the Domain-0 kernel by default. 147 148 [1] - https://xenproject.org/ 149 150config DISTRO_DEFAULTS 151 bool "Select defaults suitable for booting general purpose Linux distributions" 152 select AUTO_COMPLETE 153 select CMDLINE_EDITING 154 select CMD_BOOTI if ARM64 155 select CMD_BOOTZ if ARM && !ARM64 156 select CMD_DHCP if CMD_NET 157 select CMD_ENV_EXISTS 158 select CMD_EXT2 159 select CMD_EXT4 160 select CMD_FAT 161 select CMD_FS_GENERIC 162 select CMD_PART if PARTITIONS 163 select CMD_PING if CMD_NET 164 select CMD_PXE if NET 165 select CMD_SYSBOOT 166 select ENV_VARS_UBOOT_CONFIG 167 select HUSH_PARSER 168 select SUPPORT_RAW_INITRD 169 select SYS_LONGHELP 170 imply CMD_MII if NET 171 imply USB_STORAGE 172 imply USE_BOOTCOMMAND 173 help 174 Select this to enable various options and commands which are suitable 175 for building u-boot for booting general purpose Linux distributions. 176 177config ENV_VARS_UBOOT_CONFIG 178 bool "Add arch, board, vendor and soc variables to default environment" 179 help 180 Define this in order to add variables describing the 181 U-Boot build configuration to the default environment. 182 These will be named arch, cpu, board, vendor, and soc. 183 Enabling this option will cause the following to be defined: 184 - CONFIG_SYS_ARCH 185 - CONFIG_SYS_CPU 186 - CONFIG_SYS_BOARD 187 - CONFIG_SYS_VENDOR 188 - CONFIG_SYS_SOC 189 190config NR_DRAM_BANKS 191 int "Number of DRAM banks" 192 default 1 if ARCH_SUNXI || ARCH_OWL 193 default 4 194 help 195 This defines the number of DRAM banks. 196 197config SYS_BOOT_GET_CMDLINE 198 bool "Enable kernel command line setup" 199 help 200 Enables allocating and saving kernel cmdline in space between 201 "bootm_low" and "bootm_low" + BOOTMAPSZ. 202 203config SYS_BOOT_GET_KBD 204 bool "Enable kernel board information setup" 205 help 206 Enables allocating and saving a kernel copy of the bd_info in 207 space between "bootm_low" and "bootm_low" + BOOTMAPSZ. 208 209config SYS_MALLOC_F 210 bool "Enable malloc() pool before relocation" 211 default y if DM 212 213 help 214 Before relocation, memory is very limited on many platforms. Still, 215 we can provide a small malloc() pool if needed. Driver model in 216 particular needs this to operate, so that it can allocate the 217 initial serial device and any others that are needed. 218 219config SYS_MALLOC_F_LEN 220 hex "Size of malloc() pool before relocation" 221 depends on SYS_MALLOC_F 222 default 0x1000 if AM33XX 223 default 0x4000 if SANDBOX 224 default 0x2000 if (ARCH_IMX8 || ARCH_IMX8M || ARCH_MX7 || \ 225 ARCH_MX7ULP || ARCH_MX6 || ARCH_MX5 || \ 226 ARCH_LS1012A || ARCH_LS1021A || ARCH_LS1043A || \ 227 ARCH_LS1046A || ARCH_QEMU || ARCH_SUNXI || ARCH_OWL) 228 default 0x400 229 help 230 Before relocation, memory is very limited on many platforms. Still, 231 we can provide a small malloc() pool if needed. Driver model in 232 particular needs this to operate, so that it can allocate the 233 initial serial device and any others that are needed. 234 235config SYS_MALLOC_LEN 236 hex "Define memory for Dynamic allocation" 237 depends on ARCH_ZYNQ || ARCH_VERSAL || ARCH_STM32MP || ARCH_ROCKCHIP 238 default 0x2000000 if ARCH_ROCKCHIP 239 help 240 This defines memory to be allocated for Dynamic allocation 241 TODO: Use for other architectures 242 243config SPL_SYS_MALLOC_F_LEN 244 hex "Size of malloc() pool in SPL" 245 depends on SYS_MALLOC_F && SPL 246 default 0x2800 if RCAR_GEN3 247 default SYS_MALLOC_F_LEN 248 help 249 In SPL memory is very limited on many platforms. Still, 250 we can provide a small malloc() pool if needed. Driver model in 251 particular needs this to operate, so that it can allocate the 252 initial serial device and any others that are needed. 253 254 It is possible to enable CONFIG_SYS_SPL_MALLOC_START to start a new 255 malloc() region in SDRAM once it is inited. 256 257config TPL_SYS_MALLOC_F_LEN 258 hex "Size of malloc() pool in TPL" 259 depends on SYS_MALLOC_F && TPL 260 default SPL_SYS_MALLOC_F_LEN 261 help 262 In TPL memory is very limited on many platforms. Still, 263 we can provide a small malloc() pool if needed. Driver model in 264 particular needs this to operate, so that it can allocate the 265 initial serial device and any others that are needed. 266 267menuconfig EXPERT 268 bool "Configure standard U-Boot features (expert users)" 269 default y 270 help 271 This option allows certain base U-Boot options and settings 272 to be disabled or tweaked. This is for specialized 273 environments which can tolerate a "non-standard" U-Boot. 274 Use this only if you really know what you are doing. 275 276if EXPERT 277 config SYS_MALLOC_CLEAR_ON_INIT 278 bool "Init with zeros the memory reserved for malloc (slow)" 279 default y 280 help 281 This setting is enabled by default. The reserved malloc 282 memory is initialized with zeros, so first malloc calls 283 will return the pointer to the zeroed memory. But this 284 slows the boot time. 285 286 It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN 287 value, has more than few MiB, e.g. when uses bzip2 or bmp logo. 288 Then the boot time can be significantly reduced. 289 Warning: 290 When disabling this, please check if malloc calls, maybe 291 should be replaced by calloc - if one expects zeroed memory. 292 293config SYS_MALLOC_DEFAULT_TO_INIT 294 bool "Default malloc to init while reserving the memory for it" 295 default n 296 help 297 It may happen that one needs to move the dynamic allocation 298 from one to another memory range, eg. when moving the malloc 299 from the limited static to a potentially large dynamic (DDR) 300 memory. 301 302 If so then on top of setting the updated memory aside one 303 needs to bring the malloc init. 304 305 If such a scenario is sought choose yes. 306 307config TOOLS_DEBUG 308 bool "Enable debug information for tools" 309 help 310 Enable generation of debug information for tools such as mkimage. 311 This can be used for debugging purposes. With debug information 312 it is possible to set breakpoints on particular lines, single-step 313 debug through the source code, etc. 314 315endif # EXPERT 316 317config PHYS_64BIT 318 bool "64bit physical address support" 319 help 320 Say Y here to support 64bit physical memory address. 321 This can be used not only for 64bit SoCs, but also for 322 large physical address extension on 32bit SoCs. 323 324config HAS_ROM 325 bool 326 select BINMAN 327 help 328 Enables building of a u-boot.rom target. This collects U-Boot and 329 any necessary binary blobs. 330 331config ROM_NEEDS_BLOBS 332 bool 333 depends on HAS_ROM 334 help 335 Enable this if building the u-boot.rom target needs binary blobs, and 336 so cannot be done normally. In this case, U-Boot will only build the 337 ROM if the required blobs exist. If not, you will see an warning like: 338 339 Image 'main-section' is missing external blobs and is non-functional: 340 intel-descriptor intel-me intel-refcode intel-vga intel-mrc 341 342config BUILD_ROM 343 bool "Build U-Boot as BIOS replacement" 344 depends on HAS_ROM 345 default y if !ROM_NEEDS_BLOBS 346 help 347 This option allows to build a ROM version of U-Boot. 348 The build process generally requires several binary blobs 349 which are not shipped in the U-Boot source tree. 350 Please, see doc/arch/x86.rst for details. 351 352config SPL_IMAGE 353 string "SPL image used in the combined SPL+U-Boot image" 354 default "spl/boot.bin" if ARCH_AT91 && SPL_NAND_SUPPORT 355 default "spl/u-boot-spl.bin" 356 depends on SPL 357 help 358 Select the SPL build target that shall be generated by the SPL 359 build process (default spl/u-boot-spl.bin). This image will be 360 used to generate a combined image with SPL and main U-Boot 361 proper as one single image. 362 363config BUILD_TARGET 364 string "Build target special images" 365 default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_ARRIA10 366 default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_GEN5 367 default "u-boot-spl.kwb" if ARCH_MVEBU && SPL 368 default "u-boot-elf.srec" if RCAR_GEN3 369 default "u-boot.itb" if !BINMAN && SPL_LOAD_FIT && (ARCH_ROCKCHIP || \ 370 ARCH_SUNXI || RISCV || ARCH_ZYNQMP) 371 default "u-boot.kwb" if ARCH_KIRKWOOD 372 default "u-boot-with-spl.bin" if ARCH_AT91 && SPL_NAND_SUPPORT 373 default "u-boot-with-spl.imx" if ARCH_MX6 && SPL 374 help 375 Some SoCs need special image types (e.g. U-Boot binary 376 with a special header) as build targets. By defining 377 CONFIG_BUILD_TARGET in the SoC / board header, this 378 special image will be automatically built upon calling 379 make / buildman. 380 381config SYS_CUSTOM_LDSCRIPT 382 bool "Use a custom location for the U-Boot linker script" 383 help 384 Normally when linking U-Boot we will look in the board directory, 385 the CPU directory and finally the "cpu" directory of the architecture 386 for the ile "u-boot.lds" and use that as our linker. However, in 387 some cases we need to provide a different linker script. To do so, 388 enable this option and then provide the location under 389 CONFIG_SYS_LDSCRIPT. 390 391config SYS_LDSCRIPT 392 depends on SYS_CUSTOM_LDSCRIPT 393 string "Custom ldscript location" 394 help 395 Path within the source tree to the linker script to use for the 396 main U-Boot binary. 397 398config ERR_PTR_OFFSET 399 hex 400 default 0x0 401 help 402 Some U-Boot pointers have redundant information, so we can use a 403 scheme where we can return either an error code or a pointer with the 404 same return value. The default implementation just casts the pointer 405 to a number, however, this may fail on platforms where the end of the 406 address range is used for valid pointers (e.g. 0xffffff00 is a valid 407 heap pointer in socfpga SPL). 408 For such platforms, this value provides an upper range of those error 409 pointer values - up to 'MAX_ERRNO' bytes below this value must be 410 unused/invalid addresses. 411 412config PLATFORM_ELFENTRY 413 string 414 default "__start" if MIPS 415 default "_start" 416 417config STACK_SIZE 418 hex "Define max stack size that can be used by U-Boot" 419 default 0x4000000 if ARCH_VERSAL || ARCH_ZYNQMP 420 default 0x200000 if MICROBLAZE 421 default 0x1000000 422 help 423 Define Max stack size that can be used by U-Boot. This value is used 424 by the UEFI sub-system. On some boards initrd_high is calculated as 425 base stack pointer minus this stack size. 426 427config SYS_HAS_SRAM 428 bool 429 default y if TARGET_PIC32MZDASK 430 default y if TARGET_DEVKIT8000 431 default y if TARGET_TRICORDER 432 default n 433 help 434 Enable this to allow support for the on board SRAM. 435 SRAM base address is controlled by CONFIG_SYS_SRAM_BASE. 436 SRAM size is controlled by CONFIG_SYS_SRAM_SIZE. 437 438config SYS_SRAM_BASE 439 hex 440 default 0x80000000 if TARGET_PIC32MZDASK 441 default 0x40200000 if TARGET_DEVKIT8000 442 default 0x40200000 if TARGET_TRICORDER 443 default 0x0 444 445config SYS_SRAM_SIZE 446 hex 447 default 0x00080000 if TARGET_PIC32MZDASK 448 default 0x10000 if TARGET_DEVKIT8000 449 default 0x10000 if TARGET_TRICORDER 450 default 0x0 451 452config EXAMPLES 453 bool "Compile API examples" 454 depends on !SANDBOX 455 default y if ARCH_QEMU 456 help 457 U-Boot provides an API for standalone applications. Examples are 458 provided in directory examples/. 459 460endmenu # General setup 461 462source "api/Kconfig" 463 464source "common/Kconfig" 465 466source "cmd/Kconfig" 467 468source "disk/Kconfig" 469 470source "dts/Kconfig" 471 472source "env/Kconfig" 473 474source "net/Kconfig" 475 476source "drivers/Kconfig" 477 478source "fs/Kconfig" 479 480source "lib/Kconfig" 481 482source "test/Kconfig" 483 484source "tools/Kconfig" 485