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"
	default BR2_LINUX_KERNEL_3_2

config BR2_LINUX_KERNEL_3_2
	bool "3.2.6"

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 2.6.x or 2.6.x.y
	  official versions, as available on kernel.org

config BR2_LINUX_KERNEL_CUSTOM_TARBALL
	bool "Custom tarball"
	help
	  This option allows to specify the http or ftp location of a
	  specific kernel source tarball

config BR2_LINUX_KERNEL_CUSTOM_GIT
	bool "Custom Git tree"
	help
	  This option allows Buildroot to get the Linux kernel source
	  code from a Git repository.

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

config BR2_LINUX_KERNEL_CUSTOM_GIT_REPO_URL
	string "URL of custom Git repository"
	depends on BR2_LINUX_KERNEL_CUSTOM_GIT

config BR2_LINUX_KERNEL_CUSTOM_GIT_VERSION
	string "Custom Git version"
	depends on BR2_LINUX_KERNEL_CUSTOM_GIT

config BR2_LINUX_KERNEL_VERSION
	string
	default "3.2.6" if BR2_LINUX_KERNEL_3_2
	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_GIT_VERSION if BR2_LINUX_KERNEL_CUSTOM_GIT

#
# Patch selection
#

config BR2_LINUX_KERNEL_PATCH
	string "Custom kernel patches"
	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 a defconfig"

config BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG
	bool "Using a custom config file"

endchoice

config BR2_LINUX_KERNEL_DEFCONFIG
	string "Defconfig name"
	depends on BR2_LINUX_KERNEL_USE_DEFCONFIG
	help
	 Name of the defconfig file to use, without the trailing
	 _defconfig

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

#
# Binary format
#

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_avr32 || BR2_sh || BR2_sh64

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_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_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_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) (removed)
#   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.

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