2024-11-29 08:13:19 +00:00
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menu "Linux kernel"
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config BR2_LINUX_KERNEL
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bool
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default y
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select BR2_PACKAGE_HOST_KMOD # Unconditional, even if modules not enabled
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select BR2_PACKAGE_HOST_IMAGEMAGICK if BR2_LINUX_KERNEL_CUSTOM_LOGO_PATH != ""
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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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# Packages that need to have a kernel with support for loadable modules,
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# but do not use the kernel-modules infrastructure, should select that
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# option.
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config BR2_LINUX_NEEDS_MODULES
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bool
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config BR2_LINUX_KERNEL_CUSTOM_VERSION
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bool
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default y
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help
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This option allows to use a specific official version from
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kernel.org, like 2.6.x, 2.6.x.y, 3.x.y, ...
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Note: you cannot use this option to select a _longterm_ 2.6
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kernel, because these kernels are not located at the standard
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URL at kernel.org. Instead, select "Custom tarball" and
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specify the right URL directly.
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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_VERSION
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string
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default "5.15.6" if BR2_LINUX_KERNEL_LATEST_VERSION
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default "5.10.83-cip1" if BR2_LINUX_KERNEL_LATEST_CIP_VERSION
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default "5.10.83-cip1-rt1" if BR2_LINUX_KERNEL_LATEST_CIP_RT_VERSION
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default BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE \
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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_REPO_VERSION \
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if BR2_LINUX_KERNEL_CUSTOM_GIT || BR2_LINUX_KERNEL_CUSTOM_HG || BR2_LINUX_KERNEL_CUSTOM_SVN
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config BR2_LINUX_KERNEL_USE_DEFCONFIG
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bool
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default y
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config BR2_LINUX_KERNEL_DEFCONFIG
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string "defconfig"
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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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menu "Advance setting"
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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 *.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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config BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES
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string # "Additional configuration fragment files"
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help
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A space-separated list of kernel configuration fragment files,
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that will be merged to the main kernel configuration file.
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config BR2_LINUX_KERNEL_CUSTOM_LOGO_PATH
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string "Custom boot logo file path"
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help
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Use a custom Linux framebuffer boot logo.
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Custom logo should be in PNG or JPEG format, it will be
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converted to the linux kernel format (224 colors only)
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and copied over the original logo 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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default BR2_LINUX_KERNEL_ZIMAGE if BR2_arm || BR2_armeb
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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 || \
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BR2_powerpc64 || BR2_powerpc64le || BR2_sparc || \
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BR2_sh || BR2_xtensa
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config BR2_LINUX_KERNEL_APPENDED_ZIMAGE
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bool "zImage with appended DT"
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depends on BR2_arm || BR2_armeb
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select BR2_LINUX_KERNEL_DTS_SUPPORT
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select BR2_LINUX_KERNEL_APPENDED_DTB
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config BR2_LINUX_KERNEL_IMAGE
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bool "Image"
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depends on BR2_aarch64 || BR2_riscv
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config BR2_LINUX_KERNEL_IMAGEBZ2
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bool "Image.bz2"
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depends on BR2_riscv
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config BR2_LINUX_KERNEL_IMAGEGZ
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bool "Image.gz"
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depends on BR2_aarch64 || BR2_riscv
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config BR2_LINUX_KERNEL_IMAGELZ4
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bool "Image.lz4"
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depends on BR2_riscv
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2024-11-29 08:23:11 +00:00
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config BR2_LINUX_KERNEL_IMAGEXZ
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bool "Image.xz"
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depends on BR2_riscv
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2024-11-29 08:13:19 +00:00
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config BR2_LINUX_KERNEL_IMAGELZMA
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bool "Image.lzma"
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depends on BR2_riscv
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config BR2_LINUX_KERNEL_IMAGELZO
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bool "Image.lzo"
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depends on BR2_riscv
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config BR2_LINUX_KERNEL_LINUX_BIN
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bool "linux.bin"
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depends on BR2_microblaze
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select BR2_PACKAGE_HOST_UBOOT_TOOLS
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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
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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_VMLINUZ_BIN
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bool "vmlinuz.bin"
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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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#
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# Kernel compression format
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#
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choice
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prompt "Kernel compression format"
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depends on !BR2_riscv
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help
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This selection will just ensure that the correct host tools
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are built. The actual compression for the kernel should be
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selected in the kernel configuration menu.
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config BR2_LINUX_KERNEL_GZIP
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bool "gzip compression"
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config BR2_LINUX_KERNEL_LZ4
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bool "lz4 compression"
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config BR2_LINUX_KERNEL_LZMA
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bool "lzma compression"
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config BR2_LINUX_KERNEL_LZO
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bool "lzo compression"
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config BR2_LINUX_KERNEL_XZ
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bool "xz compression"
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config BR2_LINUX_KERNEL_ZSTD
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bool "zstd compression"
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config BR2_LINUX_KERNEL_UNCOMPRESSED
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bool "uncompressed"
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depends on BR2_s390x
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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_IMAGE_NAME
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string "Kernel image name"
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depends on BR2_LINUX_KERNEL_IMAGE_TARGET_CUSTOM
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help
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The filename of the kernel image, if it is different from
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the make target (above). Defaults to
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BR2_LINUX_KERNEL_IMAGE_TARGET_NAME. If specified, the
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filename is relative to arch/ARCH/boot/.
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If unsure, leave it empty.
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config BR2_LINUX_KERNEL_DTS_SUPPORT
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bool # "Build a Device Tree Blob (DTB)"
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help
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Compile one or more device tree sources into device tree
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blobs.
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Select the dts files to compile in the options below.
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if BR2_LINUX_KERNEL_DTS_SUPPORT
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# We have mainly three cases when it comes to device tree support:
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# 1) We don't want any support at all. Then the ..DTS_SUPPORT
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# variable won't be set
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# 2) We want device tree support, so we need the user to enter the
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# device tree name or the path to the custom device he uses, but
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# the kernel abstracts this from us and only build an image that
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# looks like a regular kernel image. In this case, we only need
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# to derive the kernel image name from the given device tree
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# name, and all the rest is as usual
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# 3) We want device tree support, but the kernel requires us to
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# build the device tree blob separately. In this case, some
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# more logic will be needed.
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# The variable below address the second case, were you only want
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# limited actions from buildroot.
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config BR2_LINUX_KERNEL_DTB_IS_SELF_BUILT
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bool "DTB is built by kernel itself"
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help
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Normally, the device tree(s) to be built have to be passed
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explicitly to the kernel build system. For some binary
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formats, however, the kernel build system links in the
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device tree directly in the kernel binary. Select this option
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if you have such a kernel binary format.
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config BR2_LINUX_KERNEL_APPENDED_DTB
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bool
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config BR2_LINUX_KERNEL_INTREE_DTS_NAME
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string "In-tree Device Tree Source file names"
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help
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Name of in-tree device tree source file, without
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the trailing .dts. You can provide a list of
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dts files to build, separated by spaces.
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config BR2_LINUX_KERNEL_CUSTOM_DTS_PATH
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string "Out-of-tree Device Tree Source file paths"
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help
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Path to the out-of-tree device tree source files.
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You can provide a list of dts paths to copy and
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build, separated by spaces.
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config BR2_LINUX_KERNEL_DTB_KEEP_DIRNAME
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bool "Keep the directory name of the Device Tree"
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help
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If enabled, the device tree blobs keep their
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directory prefixes when they get copied to the
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output image directory or the target directory.
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config BR2_LINUX_KERNEL_DTB_OVERLAY_SUPPORT
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bool "Build Device Tree with overlay support"
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help
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If enabled, pass the "-@" option to dtc, such that
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symbols are generated in the compiled Device Tree.
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Choose this option to support Device Tree overlays
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on the target system.
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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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Note that this option also installs the Device Tree Blobs to
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/boot if DTBs have been generated by the kernel build
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process.
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config BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL
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bool # "Needs host OpenSSL"
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help
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Some Linux kernel configuration options (such as
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CONFIG_SYSTEM_TRUSTED_KEYRING) require building a host
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program called extract-cert, which itself needs
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OpenSSL. Enabling this option will ensure host-openssl gets
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built before the Linux kernel.
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Enable this option if you get a Linux kernel build failure
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such as "scripts/extract-cert.c:21:25: fatal error:
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openssl/bio.h: No such file or directory".
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config BR2_LINUX_KERNEL_NEEDS_HOST_LIBELF
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bool # "Needs host libelf"
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help
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Some Linux kernel configuration options (such as
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CONFIG_UNWINDER_ORC) require building a host program that
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needs libelf. Enabling this option will ensure host-elfutils
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(which provides libelf) gets built before the Linux kernel.
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Enable this option if you get a Linux kernel build failure
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such as "Cannot generate ORC metadata for
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CONFIG_UNWINDER_ORC=y, please install libelf-dev,
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libelf-devel or elfutils-libelf-devel".
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# Linux tools
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source "package/third-party/linux-tools/Config.in"
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endmenu
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endif # BR2_LINUX_KERNEL
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endmenu
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