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# For a description of the syntax of this configuration file,
# see the file Documentation/kbuild/kconfig-language.txt in the
# Linux kernel source tree.
#
mainmenu "U-Boot $(UBOOTVERSION) Configuration"
comment "Compiler: $(CC_VERSION_TEXT)"
source "scripts/Kconfig.include"
# Allow defaults in arch-specific code to override any given here
source "arch/Kconfig"
menu "General setup"
config BROKEN
bool
help
This option cannot be enabled. It is used as dependency
for broken and incomplete features.
config DEPRECATED
bool
help
This option cannot be enabled. It it used as a dependency for
code that relies on deprecated features that will be removed and
the conversion deadline has passed.
config LOCALVERSION
string "Local version - append to U-Boot release"
help
Append an extra string to the end of your U-Boot version.
This will show up in your boot log, for example.
The string you set here will be appended after the contents of
any files with a filename matching localversion* in your
object and source tree, in that order. Your total string can
be a maximum of 64 characters.
config LOCALVERSION_AUTO
bool "Automatically append version information to the version string"
default y
help
This will try to automatically determine if the current tree is a
release tree by looking for Git tags that belong to the current
top of tree revision.
A string of the format -gxxxxxxxx will be added to the localversion
if a Git-based tree is found. The string generated by this will be
appended after any matching localversion* files, and after the value
set in CONFIG_LOCALVERSION.
(The actual string used here is the first eight characters produced
by running the command:
$ git rev-parse --verify HEAD
which is done within the script "scripts/setlocalversion".)
config CC_IS_GCC
def_bool $(success,$(CC) --version | head -n 1 | grep -q gcc)
config GCC_VERSION
int
default $(shell,$(srctree)/scripts/gcc-version.sh -p $(CC) | sed 's/^0*//') if CC_IS_GCC
default 0
config CC_IS_CLANG
def_bool $(success,$(CC) --version | head -n 1 | grep -q clang)
config CLANG_VERSION
int
default $(shell,$(srctree)/scripts/clang-version.sh $(CC))
config CC_OPTIMIZE_FOR_SIZE
bool "Optimize for size"
default y
help
Enabling this option will pass "-Os" instead of "-O2" to gcc
resulting in a smaller U-Boot image.
This option is enabled by default for U-Boot.
config OPTIMIZE_INLINING
bool "Allow compiler to uninline functions marked 'inline' in full U-Boot"
default n
help
This option determines if U-Boot forces gcc to inline the functions
developers have marked 'inline'. Doing so takes away freedom from gcc to
do what it thinks is best, which is desirable in some cases for size
reasons.
config SPL_OPTIMIZE_INLINING
bool "Allow compiler to uninline functions marked 'inline' in SPL"
depends on SPL
default n
help
This option determines if U-Boot forces gcc to inline the functions
developers have marked 'inline'. Doing so takes away freedom from gcc to
do what it thinks is best, which is desirable in some cases for size
reasons.
config ARCH_SUPPORTS_LTO
bool
config LTO
bool "Enable Link Time Optimizations"
depends on ARCH_SUPPORTS_LTO
default n
help
This option enables Link Time Optimization (LTO), a mechanism which
allows the compiler to optimize between different compilation units.
This can optimize away dead code paths, resulting in smaller binary
size (if CC_OPTIMIZE_FOR_SIZE is enabled).
This option is not available for every architecture and may
introduce bugs.
Currently, when compiling with GCC, due to a weird bug regarding
jobserver, the final linking will not respect make's --jobs argument.
Instead all available processors will be used (as reported by the
nproc command).
If unsure, say n.
config TPL_OPTIMIZE_INLINING
bool "Allow compiler to uninline functions marked 'inline' in TPL"
depends on TPL
default n
help
This option determines if U-Boot forces gcc to inline the functions
developers have marked 'inline'. Doing so takes away freedom from gcc to
do what it thinks is best, which is desirable in some cases for size
reasons.
config CC_COVERAGE
bool "Enable code coverage analysis"
depends on SANDBOX
help
Enabling this option will pass "--coverage" to gcc to compile
and link code instrumented for coverage analysis.
config CC_HAS_ASM_INLINE
def_bool $(success,echo 'void foo(void) { asm inline (""); }' | $(CC) -x c - -c -o /dev/null)
config XEN
bool "Select U-Boot be run as a bootloader for XEN Virtual Machine"
help
Enabling this option will make U-Boot be run as a bootloader
for XEN [1] Virtual Machine.
Xen is a virtual machine monitor (VMM) or a type-1 hypervisor with support
for para-virtualization. Xen can organize the safe execution of several
virtual machines on the same physical system with performance close to
native. It is used as the basis for a number of different commercial and
open source applications, such as: server virtualization, Infrastructure
as a Service (IaaS), desktop virtualization, security applications,
embedded and hardware appliances.
Xen has a special VM called Domain-0 that runs the Dom0 kernel and allows
Xen to use the device drivers for the Domain-0 kernel by default.
[1] - https://xenproject.org/
config DISTRO_DEFAULTS
bool "Select defaults suitable for booting general purpose Linux distributions"
select AUTO_COMPLETE
select CMDLINE_EDITING
select CMD_BOOTI if ARM64
select CMD_BOOTZ if ARM && !ARM64
select CMD_DHCP if CMD_NET
select CMD_ENV_EXISTS
select CMD_EXT2
select CMD_EXT4
select CMD_FAT
select CMD_FS_GENERIC
select CMD_PART if PARTITIONS
select CMD_PING if CMD_NET
select CMD_PXE if NET
select CMD_SYSBOOT
select ENV_VARS_UBOOT_CONFIG
select HUSH_PARSER
select SUPPORT_RAW_INITRD
select SYS_LONGHELP
imply CMD_MII if NET
imply USB_STORAGE
imply USE_BOOTCOMMAND
help
Select this to enable various options and commands which are suitable
for building u-boot for booting general purpose Linux distributions.
config ENV_VARS_UBOOT_CONFIG
bool "Add arch, board, vendor and soc variables to default environment"
help
Define this in order to add variables describing the
U-Boot build configuration to the default environment.
These will be named arch, cpu, board, vendor, and soc.
Enabling this option will cause the following to be defined:
- CONFIG_SYS_ARCH
- CONFIG_SYS_CPU
- CONFIG_SYS_BOARD
- CONFIG_SYS_VENDOR
- CONFIG_SYS_SOC
config NR_DRAM_BANKS
int "Number of DRAM banks"
default 1 if ARCH_SUNXI || ARCH_OWL
default 4
help
This defines the number of DRAM banks.
config SYS_BOOT_GET_CMDLINE
bool "Enable kernel command line setup"
help
Enables allocating and saving kernel cmdline in space between
"bootm_low" and "bootm_low" + BOOTMAPSZ.
config SYS_BOOT_GET_KBD
bool "Enable kernel board information setup"
help
Enables allocating and saving a kernel copy of the bd_info in
space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
config SYS_MALLOC_F
bool "Enable malloc() pool before relocation"
default y if DM
help
Before relocation, memory is very limited on many platforms. Still,
we can provide a small malloc() pool if needed. Driver model in
particular needs this to operate, so that it can allocate the
initial serial device and any others that are needed.
config SYS_MALLOC_F_LEN
hex "Size of malloc() pool before relocation"
depends on SYS_MALLOC_F
default 0x1000 if AM33XX
default 0x4000 if SANDBOX
default 0x2000 if (ARCH_IMX8 || ARCH_IMX8M || ARCH_MX7 || \
ARCH_MX7ULP || ARCH_MX6 || ARCH_MX5 || \
ARCH_LS1012A || ARCH_LS1021A || ARCH_LS1043A || \
ARCH_LS1046A || ARCH_QEMU || ARCH_SUNXI || ARCH_OWL)
default 0x400
help
Before relocation, memory is very limited on many platforms. Still,
we can provide a small malloc() pool if needed. Driver model in
particular needs this to operate, so that it can allocate the
initial serial device and any others that are needed.
config SYS_MALLOC_LEN
hex "Define memory for Dynamic allocation"
depends on ARCH_ZYNQ || ARCH_VERSAL || ARCH_STM32MP || ARCH_ROCKCHIP
default 0x2000000 if ARCH_ROCKCHIP
help
This defines memory to be allocated for Dynamic allocation
TODO: Use for other architectures
config SPL_SYS_MALLOC_F_LEN
hex "Size of malloc() pool in SPL"
depends on SYS_MALLOC_F && SPL
default 0x2800 if RCAR_GEN3
default SYS_MALLOC_F_LEN
help
In SPL memory is very limited on many platforms. Still,
we can provide a small malloc() pool if needed. Driver model in
particular needs this to operate, so that it can allocate the
initial serial device and any others that are needed.
It is possible to enable CONFIG_SYS_SPL_MALLOC_START to start a new
malloc() region in SDRAM once it is inited.
config TPL_SYS_MALLOC_F_LEN
hex "Size of malloc() pool in TPL"
depends on SYS_MALLOC_F && TPL
default SPL_SYS_MALLOC_F_LEN
help
In TPL memory is very limited on many platforms. Still,
we can provide a small malloc() pool if needed. Driver model in
particular needs this to operate, so that it can allocate the
initial serial device and any others that are needed.
menuconfig EXPERT
bool "Configure standard U-Boot features (expert users)"
default y
help
This option allows certain base U-Boot options and settings
to be disabled or tweaked. This is for specialized
environments which can tolerate a "non-standard" U-Boot.
Use this only if you really know what you are doing.
if EXPERT
config SYS_MALLOC_CLEAR_ON_INIT
bool "Init with zeros the memory reserved for malloc (slow)"
default y
help
This setting is enabled by default. The reserved malloc
memory is initialized with zeros, so first malloc calls
will return the pointer to the zeroed memory. But this
slows the boot time.
It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
Then the boot time can be significantly reduced.
Warning:
When disabling this, please check if malloc calls, maybe
should be replaced by calloc - if one expects zeroed memory.
config SYS_MALLOC_DEFAULT_TO_INIT
bool "Default malloc to init while reserving the memory for it"
default n
help
It may happen that one needs to move the dynamic allocation
from one to another memory range, eg. when moving the malloc
from the limited static to a potentially large dynamic (DDR)
memory.
If so then on top of setting the updated memory aside one
needs to bring the malloc init.
If such a scenario is sought choose yes.
config TOOLS_DEBUG
bool "Enable debug information for tools"
help
Enable generation of debug information for tools such as mkimage.
This can be used for debugging purposes. With debug information
it is possible to set breakpoints on particular lines, single-step
debug through the source code, etc.
endif # EXPERT
config PHYS_64BIT
bool "64bit physical address support"
help
Say Y here to support 64bit physical memory address.
This can be used not only for 64bit SoCs, but also for
large physical address extension on 32bit SoCs.
config HAS_ROM
bool
select BINMAN
help
Enables building of a u-boot.rom target. This collects U-Boot and
any necessary binary blobs.
config SPL_IMAGE
string "SPL image used in the combined SPL+U-Boot image"
default "spl/boot.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
default "spl/u-boot-spl.bin"
depends on SPL
help
Select the SPL build target that shall be generated by the SPL
build process (default spl/u-boot-spl.bin). This image will be
used to generate a combined image with SPL and main U-Boot
proper as one single image.
config BUILD_TARGET
string "Build target special images"
default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_ARRIA10
default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_GEN5
default "u-boot-spl.kwb" if ARCH_MVEBU && SPL
default "u-boot-elf.srec" if RCAR_GEN3
default "u-boot.itb" if !BINMAN && SPL_LOAD_FIT && (ARCH_ROCKCHIP || \
ARCH_SUNXI || RISCV || ARCH_ZYNQMP)
default "u-boot.kwb" if ARCH_KIRKWOOD
default "u-boot-with-spl.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
default "u-boot-with-spl.imx" if ARCH_MX6 && SPL
help
Some SoCs need special image types (e.g. U-Boot binary
with a special header) as build targets. By defining
CONFIG_BUILD_TARGET in the SoC / board header, this
special image will be automatically built upon calling
make / buildman.
config SYS_CUSTOM_LDSCRIPT
bool "Use a custom location for the U-Boot linker script"
help
Normally when linking U-Boot we will look in the board directory,
the CPU directory and finally the "cpu" directory of the architecture
for the ile "u-boot.lds" and use that as our linker. However, in
some cases we need to provide a different linker script. To do so,
enable this option and then provide the location under
CONFIG_SYS_LDSCRIPT.
config SYS_LDSCRIPT
depends on SYS_CUSTOM_LDSCRIPT
string "Custom ldscript location"
help
Path within the source tree to the linker script to use for the
main U-Boot binary.
config ERR_PTR_OFFSET
hex
default 0x0
help
Some U-Boot pointers have redundant information, so we can use a
scheme where we can return either an error code or a pointer with the
same return value. The default implementation just casts the pointer
to a number, however, this may fail on platforms where the end of the
address range is used for valid pointers (e.g. 0xffffff00 is a valid
heap pointer in socfpga SPL).
For such platforms, this value provides an upper range of those error
pointer values - up to 'MAX_ERRNO' bytes below this value must be
unused/invalid addresses.
config PLATFORM_ELFENTRY
string
default "__start" if MIPS
default "_start"
config STACK_SIZE
hex "Define max stack size that can be used by U-Boot"
default 0x4000000 if ARCH_VERSAL || ARCH_ZYNQMP
default 0x200000 if MICROBLAZE
default 0x1000000
help
Define Max stack size that can be used by U-Boot. This value is used
by the UEFI sub-system. On some boards initrd_high is calculated as
base stack pointer minus this stack size.
config SYS_HAS_SRAM
bool
default y if TARGET_PIC32MZDASK
default y if TARGET_DEVKIT8000
default y if TARGET_TRICORDER
default n
help
Enable this to allow support for the on board SRAM.
SRAM base address is controlled by CONFIG_SYS_SRAM_BASE.
SRAM size is controlled by CONFIG_SYS_SRAM_SIZE.
config SYS_SRAM_BASE
hex
default 0x80000000 if TARGET_PIC32MZDASK
default 0x40200000 if TARGET_DEVKIT8000
default 0x40200000 if TARGET_TRICORDER
default 0x0
config SYS_SRAM_SIZE
hex
default 0x00080000 if TARGET_PIC32MZDASK
default 0x10000 if TARGET_DEVKIT8000
default 0x10000 if TARGET_TRICORDER
default 0x0
config EXAMPLES
bool "Compile API examples"
depends on !SANDBOX
default y if ARCH_QEMU
help
U-Boot provides an API for standalone applications. Examples are
provided in directory examples/.
endmenu # General setup
source "api/Kconfig"
source "common/Kconfig"
source "cmd/Kconfig"
source "disk/Kconfig"
source "dts/Kconfig"
source "env/Kconfig"
source "net/Kconfig"
source "drivers/Kconfig"
source "fs/Kconfig"
source "lib/Kconfig"
source "test/Kconfig"
source "tools/Kconfig"
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