69fc497df0
This patch introduces some support for device tree-enabled kernels. It replaces the former BR2_LINUX_KERNEL_DTS_FILE option that was microblaze-only, that was quite limited. This option was quite limited, first obviously because it was restricted to microblaze, but also because it targetted only external device tree source files, and allowed only to build simpleImages using the custom image name mechanism. This patch adds a much more generic one, that can work on basically every architecture that supports device tree. It allows to build both device tree source file that comes with the kernel source or to set the path to the device tree file to use so that one can use a custom device tree. Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com> Acked-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
235 lines
6.1 KiB
Plaintext
235 lines
6.1 KiB
Plaintext
menu "Kernel"
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config BR2_LINUX_KERNEL
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bool "Linux Kernel"
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help
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Enable this option if you want to build a Linux kernel for
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your embedded device
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if BR2_LINUX_KERNEL
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#
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# Version selection. We provide the choice between:
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#
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# 1. A single fairly recent stable kernel version
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# 2. In case an internal toolchain has been built, the same kernel
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# version as the kernel headers
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# 3. A custom stable version
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# 4. A custom tarball
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#
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choice
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prompt "Kernel version"
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default BR2_LINUX_KERNEL_3_4
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config BR2_LINUX_KERNEL_3_4
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bool "3.4.6"
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config BR2_LINUX_KERNEL_SAME_AS_HEADERS
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bool "Same as toolchain kernel headers"
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depends on BR2_TOOLCHAIN_BUILDROOT
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help
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This option will re-use the same kernel sources as the one
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that have been used for the kernel headers of the
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cross-compiling toolchain. Having the same version for the
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kernel running on the system and for the kernel headers is
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not a requirement, but using the same version allows to
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download only one tarball of the kernel sources.
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config BR2_LINUX_KERNEL_CUSTOM_VERSION
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bool "Custom version"
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help
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This option allows to use a specific 2.6.x or 2.6.x.y
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official versions, as available on kernel.org
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config BR2_LINUX_KERNEL_CUSTOM_TARBALL
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bool "Custom tarball"
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help
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This option allows to specify the http or ftp location of a
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specific kernel source tarball
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config BR2_LINUX_KERNEL_CUSTOM_GIT
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bool "Custom Git tree"
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help
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This option allows Buildroot to get the Linux kernel source
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code from a Git repository.
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endchoice
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config BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE
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string "Kernel version"
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depends on BR2_LINUX_KERNEL_CUSTOM_VERSION
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config BR2_LINUX_KERNEL_CUSTOM_TARBALL_LOCATION
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string "URL of custom kernel tarball"
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depends on BR2_LINUX_KERNEL_CUSTOM_TARBALL
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config BR2_LINUX_KERNEL_CUSTOM_GIT_REPO_URL
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string "URL of custom Git repository"
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depends on BR2_LINUX_KERNEL_CUSTOM_GIT
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config BR2_LINUX_KERNEL_CUSTOM_GIT_VERSION
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string "Custom Git version"
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default "HEAD"
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depends on BR2_LINUX_KERNEL_CUSTOM_GIT
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help
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Git revision to use in the format used by git rev-parse,
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E.G. a sha id, a tag, branch, ..
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config BR2_LINUX_KERNEL_VERSION
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string
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default "3.4.6" if BR2_LINUX_KERNEL_3_4
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default BR2_DEFAULT_KERNEL_HEADERS if BR2_LINUX_KERNEL_SAME_AS_HEADERS
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default BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE if BR2_LINUX_KERNEL_CUSTOM_VERSION
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default "custom" if BR2_LINUX_KERNEL_CUSTOM_TARBALL
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default $BR2_LINUX_KERNEL_CUSTOM_GIT_VERSION if BR2_LINUX_KERNEL_CUSTOM_GIT
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#
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# Patch selection
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#
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config BR2_LINUX_KERNEL_PATCH
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string "Custom kernel patches"
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help
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A space-separated list of patches to apply to the
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kernel. Each patch can be described as an URL, a local file
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path, or a directory. In the case of a directory, all files
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matching linux-*.patch in the directory will be applied.
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#
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# Configuration selection
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#
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choice
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prompt "Kernel configuration"
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default BR2_LINUX_KERNEL_USE_DEFCONFIG
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config BR2_LINUX_KERNEL_USE_DEFCONFIG
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bool "Using a defconfig"
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config BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG
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bool "Using a custom config file"
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endchoice
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config BR2_LINUX_KERNEL_DEFCONFIG
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string "Defconfig name"
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depends on BR2_LINUX_KERNEL_USE_DEFCONFIG
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help
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Name of the kernel defconfig file to use, without the
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trailing _defconfig. The defconfig is located in
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arch/<arch>/configs in the kernel tree.
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config BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE
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string "Configuration file path"
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depends on BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG
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help
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Path to the kernel configuration file
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#
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# Binary format
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#
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choice
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prompt "Kernel binary format"
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config BR2_LINUX_KERNEL_UIMAGE
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bool "uImage"
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depends on BR2_arm || BR2_armeb || BR2_bfin || BR2_powerpc || BR2_avr32 || BR2_sh || BR2_sh64
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config BR2_LINUX_KERNEL_BZIMAGE
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bool "bzImage"
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depends on BR2_i386 || BR2_x86_64
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config BR2_LINUX_KERNEL_ZIMAGE
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bool "zImage"
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depends on BR2_arm || BR2_armeb || BR2_powerpc || BR2_sparc || BR2_sh || BR2_sh64 || BR2_xtensa
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config BR2_LINUX_KERNEL_VMLINUX_BIN
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bool "vmlinux.bin"
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depends on BR2_mips || BR2_mipsel || BR2_sh || BR2_sh64
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config BR2_LINUX_KERNEL_VMLINUX
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bool "vmlinux"
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config BR2_LINUX_KERNEL_VMLINUZ
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bool "vmlinuz"
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depends on BR2_mips || BR2_mipsel
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config BR2_LINUX_KERNEL_IMAGE_TARGET_CUSTOM
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bool "custom target"
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help
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For certain cases a board-specific target image must be
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used. For example, on powerPC where the OpenFirmware
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description is attached in a board-specific kernel image
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target like 'cuImage.mpc8379_rdb'.
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Select this option and specify the make target in "Kernel
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image target name".
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endchoice
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config BR2_LINUX_KERNEL_IMAGE_TARGET_NAME
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string "Kernel image target name"
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depends on BR2_LINUX_KERNEL_IMAGE_TARGET_CUSTOM
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help
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Specify the kernel make target to build the kernel that you
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need.
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config BR2_LINUX_KERNEL_DTS_SUPPORT
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bool "Device tree support"
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help
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Compile a device tree source into a device tree blob.
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Select the dts file to compile in the options below.
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if BR2_LINUX_KERNEL_DTS_SUPPORT
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choice
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prompt "Device tree source"
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default BR2_LINUX_KERNEL_USE_INTREE_DTS
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config BR2_LINUX_KERNEL_USE_INTREE_DTS
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bool "Use a device tree present in the kernel."
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help
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Use a device tree source distributed with
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the kernel sources. The dts files are located
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in the arch/<arch>/boot/dts folder.
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config BR2_LINUX_KERNEL_USE_CUSTOM_DTS
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bool "Use a custom device tree file"
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help
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Use a custom device tree file, i.e, a device
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tree file that does not belong to the kernel
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source tree.
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endchoice
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config BR2_LINUX_KERNEL_INTREE_DTS_NAME
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string "Device Tree Source file name"
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depends on BR2_LINUX_KERNEL_USE_INTREE_DTS
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help
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Name of the device tree source file, without
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the trailing .dts
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config BR2_LINUX_KERNEL_CUSTOM_DTS_PATH
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string "Device Tree Source file path"
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depends on BR2_LINUX_KERNEL_USE_CUSTOM_DTS
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help
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Path to the device tree source file
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endif
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config BR2_LINUX_KERNEL_INSTALL_TARGET
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bool "Install kernel image to /boot in target"
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depends on !BR2_TARGET_ROOTFS_INITRAMFS
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help
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Select this option to have the kernel image installed to
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/boot in the target root filesystem, as is typically done on
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x86/x86_64 systems.
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# Linux extensions
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source "linux/Config.ext.in"
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endif # BR2_LINUX_KERNEL
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endmenu
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