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Config.in
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menu "Kernel"
config BR2_LINUX_KERNEL
bool "Linux Kernel"
help
Enable this option if you want to build a Linux kernel for
your embedded device
if BR2_LINUX_KERNEL
#
# Version selection. We provide the choice between:
#
# 1. A single fairly recent stable kernel version
# 2. In case an internal toolchain has been built, the same kernel
# version as the kernel headers
# 3. A custom stable version
# 4. A custom tarball
#
choice
prompt "Kernel version"
config BR2_LINUX_KERNEL_LATEST_VERSION
bool "3.19"
config BR2_LINUX_KERNEL_SAME_AS_HEADERS
bool "Same as toolchain kernel headers"
depends on BR2_TOOLCHAIN_BUILDROOT
help
This option will re-use the same kernel sources as the one
that have been used for the kernel headers of the
cross-compiling toolchain. Having the same version for the
kernel running on the system and for the kernel headers is
not a requirement, but using the same version allows to
download only one tarball of the kernel sources.
config BR2_LINUX_KERNEL_CUSTOM_VERSION
bool "Custom version"
help
This option allows to use a specific official version from
kernel.org, like 2.6.x, 2.6.x.y, 3.x.y, ...
Note: you cannot use this option to select a _longterm_ 2.6
kernel, because these kernels are not located at the standard
URL at kernel.org. Instead, select "Custom tarball" and
specify the right URL directly.
config BR2_LINUX_KERNEL_CUSTOM_TARBALL
bool "Custom tarball"
help
This option allows to specify a URL pointing to a kernel source
tarball. This URL can use any protocol recognized by Buildroot,
like http://, ftp://, file:// or scp://.
When pointing to a local tarball using file://, you may want to
use a make variable like $(TOPDIR) to reference the root of the
Buildroot tree.
config BR2_LINUX_KERNEL_CUSTOM_GIT
bool "Custom Git repository"
help
This option allows Buildroot to get the Linux kernel source
code from a Git repository.
config BR2_LINUX_KERNEL_CUSTOM_HG
bool "Custom Mercurial repository"
help
This option allows Buildroot to get the Linux kernel source
code from a Mercurial repository.
config BR2_LINUX_KERNEL_CUSTOM_LOCAL
bool "Local directory"
help
This option allows Buildroot to get the Linux kernel source
code from a local directory.
endchoice
config BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE
string "Kernel version"
depends on BR2_LINUX_KERNEL_CUSTOM_VERSION
config BR2_LINUX_KERNEL_CUSTOM_TARBALL_LOCATION
string "URL of custom kernel tarball"
depends on BR2_LINUX_KERNEL_CUSTOM_TARBALL
if BR2_LINUX_KERNEL_CUSTOM_GIT || BR2_LINUX_KERNEL_CUSTOM_HG
config BR2_LINUX_KERNEL_CUSTOM_REPO_URL
string "URL of custom repository"
default BR2_LINUX_KERNEL_CUSTOM_GIT_REPO_URL \
if BR2_LINUX_KERNEL_CUSTOM_GIT_REPO_URL != "" # legacy
config BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION
string "Custom repository version"
default BR2_LINUX_KERNEL_CUSTOM_GIT_VERSION \
if BR2_LINUX_KERNEL_CUSTOM_GIT_VERSION != "" # legacy
help
Revision to use in the typical format used by Git/Mercurial
E.G. a sha id, a tag, branch, ..
endif
config BR2_LINUX_KERNEL_CUSTOM_LOCAL_PATH
string "Path to the local directory"
depends on BR2_LINUX_KERNEL_CUSTOM_LOCAL
help
Path to the local directory with the Linux kernel source code.
config BR2_LINUX_KERNEL_VERSION
string
default "3.19" if BR2_LINUX_KERNEL_LATEST_VERSION
default BR2_DEFAULT_KERNEL_HEADERS if BR2_LINUX_KERNEL_SAME_AS_HEADERS
default BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE \
if BR2_LINUX_KERNEL_CUSTOM_VERSION
default "custom" if BR2_LINUX_KERNEL_CUSTOM_TARBALL
default BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION \
if BR2_LINUX_KERNEL_CUSTOM_GIT || BR2_LINUX_KERNEL_CUSTOM_HG
default "custom" if BR2_LINUX_KERNEL_CUSTOM_LOCAL
#
# Patch selection
#
config BR2_LINUX_KERNEL_PATCH
string "Custom kernel patches"
depends on !BR2_LINUX_KERNEL_CUSTOM_LOCAL
help
A space-separated list of patches to apply to the
kernel. Each patch can be described as an URL, a local file
path, or a directory. In the case of a directory, all files
matching linux-*.patch in the directory will be applied.
#
# Configuration selection
#
choice
prompt "Kernel configuration"
default BR2_LINUX_KERNEL_USE_DEFCONFIG
config BR2_LINUX_KERNEL_USE_DEFCONFIG
bool "Using an in-tree defconfig file"
config BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG
bool "Using a custom (def)config file"
endchoice
config BR2_LINUX_KERNEL_DEFCONFIG
string "Defconfig name"
depends on BR2_LINUX_KERNEL_USE_DEFCONFIG
help
Name of the kernel defconfig file to use, without the
trailing _defconfig. The defconfig is located in
arch/<arch>/configs in the kernel tree.
config BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE
string "Configuration file path"
depends on BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG
help
Path to the kernel configuration file
Note: this can be a defconfig file or a complete .config file,
which can later be saved back with make linux-update-(def)config.
#
# Binary format
#
config BR2_LINUX_KERNEL_UBOOT_IMAGE
bool
choice
prompt "Kernel binary format"
config BR2_LINUX_KERNEL_UIMAGE
bool "uImage"
depends on BR2_arc || BR2_arm || BR2_armeb || BR2_bfin || \
BR2_powerpc || BR2_sh || BR2_sh64 || \
BR2_mips || BR2_mipsel || BR2_mips64 || BR2_mips64el
select BR2_LINUX_KERNEL_UBOOT_IMAGE
config BR2_LINUX_KERNEL_APPENDED_UIMAGE
bool "uImage with appended DT"
depends on BR2_arm || BR2_armeb
select BR2_LINUX_KERNEL_DTS_SUPPORT
select BR2_LINUX_KERNEL_APPENDED_DTB
select BR2_LINUX_KERNEL_UBOOT_IMAGE
config BR2_LINUX_KERNEL_BZIMAGE
bool "bzImage"
depends on BR2_i386 || BR2_x86_64
config BR2_LINUX_KERNEL_ZIMAGE
bool "zImage"
depends on BR2_arm || BR2_armeb || BR2_powerpc || \
BR2_powerpc64 || BR2_powerpc64le || BR2_sparc || \
BR2_sh || BR2_sh64 || BR2_xtensa
config BR2_LINUX_KERNEL_APPENDED_ZIMAGE
bool "zImage with appended DT"
depends on BR2_arm || BR2_armeb
select BR2_LINUX_KERNEL_DTS_SUPPORT
select BR2_LINUX_KERNEL_APPENDED_DTB
config BR2_LINUX_KERNEL_CUIMAGE
bool "cuImage"
depends on BR2_powerpc
select BR2_LINUX_KERNEL_UBOOT_IMAGE
select BR2_LINUX_KERNEL_DTS_SUPPORT
select BR2_LINUX_KERNEL_DTB_IS_SELF_BUILT
config BR2_LINUX_KERNEL_SIMPLEIMAGE
bool "simpleImage"
depends on BR2_microblaze
select BR2_LINUX_KERNEL_UBOOT_IMAGE
select BR2_LINUX_KERNEL_DTS_SUPPORT
select BR2_LINUX_KERNEL_DTB_IS_SELF_BUILT
config BR2_LINUX_KERNEL_LINUX_BIN
bool "linux.bin"
depends on BR2_microblaze
select BR2_LINUX_KERNEL_UBOOT_IMAGE
config BR2_LINUX_KERNEL_VMLINUX_BIN
bool "vmlinux.bin"
depends on BR2_mips || BR2_mipsel || BR2_sh || BR2_sh64
config BR2_LINUX_KERNEL_VMLINUX
bool "vmlinux"
config BR2_LINUX_KERNEL_VMLINUZ
bool "vmlinuz"
depends on BR2_mips || BR2_mipsel
config BR2_LINUX_KERNEL_IMAGE_TARGET_CUSTOM
bool "custom target"
help
For certain cases a board-specific target image must be
used. For example, on powerPC where the OpenFirmware
description is attached in a board-specific kernel image
target like 'cuImage.mpc8379_rdb'.
Select this option and specify the make target in "Kernel
image target name".
endchoice
config BR2_LINUX_KERNEL_IMAGE_TARGET_NAME
string "Kernel image target name"
depends on BR2_LINUX_KERNEL_IMAGE_TARGET_CUSTOM
help
Specify the kernel make target to build the kernel that you
need.
config BR2_LINUX_KERNEL_IMAGE_NAME
string "Kernel image name"
depends on BR2_LINUX_KERNEL_IMAGE_TARGET_CUSTOM
help
The filename of the kernel image, if it is different from the
make target (above). Only Xtensa uses a filename different from
the make target. Defaults to BR2_LINUX_KERNEL_IMAGE_TARGET_NAME.
If unsure, leave it empty.
config BR2_LINUX_KERNEL_UIMAGE_LOADADDR
string "load address (for 3.7+ multi-platform image)"
depends on BR2_arm || BR2_armeb
depends on BR2_LINUX_KERNEL_UIMAGE || BR2_LINUX_KERNEL_APPENDED_UIMAGE
help
If your ARM system's Linux kernel is configured with the new (3.7+)
multi-architecture support (CONFIG_ARCH_MULTIPLATFORM=y in your
kernel config), then it is necessary to specify a kernel load address
when building the uImage. This should be a hexadecimal string
beginning with 0x, for example: 0x00008000.
If unsure, let this option empty.
config BR2_LINUX_KERNEL_DTS_SUPPORT
bool "Build a Device Tree Blob (DTB)"
help
Compile one or more device tree sources into device tree blobs.
Select the dts files to compile in the options below.
if BR2_LINUX_KERNEL_DTS_SUPPORT
# We have mainly three cases when it comes to device tree support:
# 1) We don't want any support at all. Then the ..DTS_SUPPORT
# variable won't be set
# 2) We want device tree support, so we need the user to enter
# the device tree name or the the path to the custom device
# he uses, but the kernel abstracts this from us and only
# build an image that looks like a regular kernel image. In
# this case, we only need to derive the kernel image name from
# the given device tree name, and all the rest is as usual
# 3) We want device tree support, but the kernel requires us to
# build the device tree blob separately. In this case, some
# more logic will be needed.
# The variable below address the second case, were you only want
# limited actions from buildroot.
config BR2_LINUX_KERNEL_DTB_IS_SELF_BUILT
bool
config BR2_LINUX_KERNEL_APPENDED_DTB
bool
choice
prompt "Device tree source"
default BR2_LINUX_KERNEL_USE_INTREE_DTS
config BR2_LINUX_KERNEL_USE_INTREE_DTS
bool "Use a device tree present in the kernel."
help
Use a device tree source distributed with
the kernel sources. The dts files are located
in the arch/<arch>/boot/dts folder.
config BR2_LINUX_KERNEL_USE_CUSTOM_DTS
bool "Use a custom device tree file"
help
Use a custom device tree file, i.e, a device
tree file that does not belong to the kernel
source tree.
endchoice
config BR2_LINUX_KERNEL_INTREE_DTS_NAME
string "Device Tree Source file names"
depends on BR2_LINUX_KERNEL_USE_INTREE_DTS
help
Name of the device tree source file, without
the trailing .dts. You can provide a list of
dts files to build, separated by spaces.
config BR2_LINUX_KERNEL_CUSTOM_DTS_PATH
string "Device Tree Source file paths"
depends on BR2_LINUX_KERNEL_USE_CUSTOM_DTS
help
Path to the device tree source files. You can
provide a list of dts paths to copy and build,
separated by spaces.
endif
config BR2_LINUX_KERNEL_INSTALL_TARGET
bool "Install kernel image to /boot in target"
depends on !BR2_TARGET_ROOTFS_INITRAMFS
help
Select this option to have the kernel image installed to
/boot in the target root filesystem, as is typically done on
x86/x86_64 systems.
Note that this option also installs the Device Tree Blobs to
/boot if DTBs have been generated by the kernel build
process.
# Linux extensions
source "linux/Config.ext.in"
endif # BR2_LINUX_KERNEL
endmenu