menu "Kernel"
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config BR2_LINUX_KERNEL
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bool "Linux Kernel"
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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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endif # 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. A custom stable version
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# 3. A custom tarball
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# 4. A set of custom repository locations
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# 5. A custom local version
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#
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choice
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prompt "Kernel version"
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config BR2_LINUX_KERNEL_LATEST_VERSION
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bool "Latest version (5.13)"
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config BR2_LINUX_KERNEL_LATEST_CIP_VERSION
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bool "Latest CIP SLTS version (4.19.182-cip45)"
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help
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CIP launched in the spring of 2016 to address the needs of
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organizations in industries such as power generation and
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distribution, water, oil and gas, transportation, building
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automation and more for reliable and secure Linux-based
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embedded systems that can be sustained over a period of
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10 to as many as 60 years.
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The project's goal is to provide an open source base layer
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of industrial-grade software that permits the use and
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implementation of software building blocks that meet
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these requirements.
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The CIP community plans to maintain 4.19 for security and
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bug fixes for more than 10 years.
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https://www.cip-project.org
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config BR2_LINUX_KERNEL_LATEST_CIP_RT_VERSION
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bool "Latest CIP RT SLTS version (4.19.165-cip41-rt18)"
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help
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Same as the CIP version, but this is the PREEMPT_RT realtime
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variant.
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The CIP community plans to maintain 4.19 for security and
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bug fixes for more than 10 years.
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https://www.cip-project.org
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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 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_TARBALL
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bool "Custom tarball"
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help
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This option allows to specify a URL pointing to a kernel
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source tarball. This URL can use any protocol recognized by
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Buildroot, like http://, ftp://, file:// or scp://.
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When pointing to a local tarball using file://, you may want
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to use a make variable like $(TOPDIR) to reference the root of
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the Buildroot tree.
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config BR2_LINUX_KERNEL_CUSTOM_LOCAL
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bool "Custom local"
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help
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This option allows to specify path of local kernel source.
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You may want to use a make variable like $(TOPDIR) to reference
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the root of the Buildroot tree.
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config BR2_LINUX_KERNEL_CUSTOM_GIT
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bool "Custom Git repository"
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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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config BR2_LINUX_KERNEL_CUSTOM_HG
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bool "Custom Mercurial repository"
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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 Mercurial repository.
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config BR2_LINUX_KERNEL_CUSTOM_SVN
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bool "Custom Subversion repository"
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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 Subversion 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_LOCAL_LOCATION
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string "URL of custom local kernel"
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depends on BR2_LINUX_KERNEL_CUSTOM_LOCAL
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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_CUSTOM_REPO_URL
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string "URL of custom repository"
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config BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION
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string "Custom repository version"
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help
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Revision to use in the typical format used by
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Git/Mercurial/Subversion E.G. a sha id, a tag, branch, ..
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endif
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config BR2_LINUX_KERNEL_VERSION
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string
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default "5.13.2" if BR2_LINUX_KERNEL_LATEST_VERSION
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default "4.19.182-cip45" if BR2_LINUX_KERNEL_LATEST_CIP_VERSION
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default "4.19.165-cip41-rt18" 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 || BR2_LINUX_KERNEL_CUSTOM_LOCAL
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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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#
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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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if BR2_LINUX_KERNEL
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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 an in-tree defconfig file"
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config BR2_LINUX_KERNEL_USE_ARCH_DEFAULT_CONFIG
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bool "Use the architecture default configuration"
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help
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This option will use the default configuration for the
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selected architecture. I.e, it is equivalent to running
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"make ARCH=<foo> defconfig". This is useful on architectures
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that have a single defconfig file, such as ARM64.
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config BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG
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bool "Using a custom (def)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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Note: this can be a defconfig file or a complete .config file,
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which can later be saved back with make
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linux-update-(def)config.
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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_UIMAGE
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bool "uImage"
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depends on BR2_arc || BR2_arm || BR2_armeb || \
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BR2_powerpc || BR2_powerpc64 || BR2_powerpc64le || \
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BR2_sh || BR2_mips || BR2_mipsel || \
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BR2_mips64 || BR2_mips64el || BR2_xtensa
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select BR2_PACKAGE_HOST_UBOOT_TOOLS
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config BR2_LINUX_KERNEL_APPENDED_UIMAGE
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bool "uImage 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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select BR2_PACKAGE_HOST_UBOOT_TOOLS
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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 || BR2_s390x
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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_ZIMAGE_EPAPR
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bool "zImage.epapr"
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depends on BR2_powerpc64 || BR2_powerpc64le
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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_CUIMAGE
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bool "cuImage"
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depends on BR2_powerpc
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select BR2_PACKAGE_HOST_UBOOT_TOOLS
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select BR2_LINUX_KERNEL_DTS_SUPPORT
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select BR2_LINUX_KERNEL_DTB_IS_SELF_BUILT
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config BR2_LINUX_KERNEL_SIMPLEIMAGE
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bool "simpleImage"
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depends on BR2_microblaze
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select BR2_PACKAGE_HOST_UBOOT_TOOLS
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select BR2_LINUX_KERNEL_DTS_SUPPORT
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select BR2_LINUX_KERNEL_DTB_IS_SELF_BUILT
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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_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_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
|
description is attached in a board-specific kernel image
|
target like 'cuImage.mpc8379_rdb'.
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|
Select this option and specify the make target in "Kernel
|
image target name".
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endchoice
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#
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# Kernel compression format
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#
|
|
choice
|
prompt "Kernel compression format"
|
help
|
This selection will just ensure that the correct host tools
|
are built. The actual compression for the kernel should be
|
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
|
bool "xz compression"
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config BR2_LINUX_KERNEL_ZSTD
|
bool "zstd compression"
|
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config BR2_LINUX_KERNEL_UNCOMPRESSED
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bool "uncompressed"
|
depends on BR2_s390x
|
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endchoice
|
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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). Defaults to
|
BR2_LINUX_KERNEL_IMAGE_TARGET_NAME. If specified, the
|
filename is relative to arch/ARCH/boot/.
|
|
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 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 "DTB is built by kernel itself"
|
help
|
Normally, the device tree(s) to be built have to be passed
|
explicitly to the kernel build system. For some binary
|
formats, however, the kernel build system links in the
|
device tree directly in the kernel binary. Select this option
|
if you have such a kernel binary format.
|
|
config BR2_LINUX_KERNEL_APPENDED_DTB
|
bool
|
|
config BR2_LINUX_KERNEL_INTREE_DTS_NAME
|
string "In-tree Device Tree Source file names"
|
help
|
Name of in-tree 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 "Out-of-tree Device Tree Source file paths"
|
help
|
Path to to out-of-tree device tree source files.
|
You can provide a list of dts paths to copy and
|
build, separated by spaces.
|
|
config BR2_LINUX_KERNEL_DTB_KEEP_DIRNAME
|
bool "Keep the directory name of the Device Tree"
|
help
|
If enabled, the device tree blobs keep their
|
directory prefixes when they get copied to the
|
output image directory or the target directory.
|
|
config BR2_LINUX_KERNEL_DTB_OVERLAY_SUPPORT
|
bool "Build Device Tree with overlay support"
|
help
|
If enabled, pass the "-@" option to dtc, such that
|
symbols are generated in the compiled Device Tree.
|
Choose this option to support Device Tree overlays
|
on the target system.
|
|
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.
|
|
config BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL
|
bool "Needs host OpenSSL"
|
help
|
Some Linux kernel configuration options (such as
|
CONFIG_SYSTEM_TRUSTED_KEYRING) require building a host
|
program called extract-cert, which itself needs
|
OpenSSL. Enabling this option will ensure host-openssl gets
|
built before the Linux kernel.
|
|
Enable this option if you get a Linux kernel build failure
|
such as "scripts/extract-cert.c:21:25: fatal error:
|
openssl/bio.h: No such file or directory".
|
|
config BR2_LINUX_KERNEL_NEEDS_HOST_LIBELF
|
bool "Needs host libelf"
|
help
|
Some Linux kernel configuration options (such as
|
CONFIG_UNWINDER_ORC) require building a host program that
|
needs libelf. Enabling this option will ensure host-elfutils
|
(which provides libelf) gets built before the Linux kernel.
|
|
Enable this option if you get a Linux kernel build failure
|
such as "Cannot generate ORC metadata for
|
CONFIG_UNWINDER_ORC=y, please install libelf-dev,
|
libelf-devel or elfutils-libelf-devel".
|
|
# Linux extensions
|
source "linux/Config.ext.in"
|
|
endif # BR2_LINUX_KERNEL
|
|
# Linux tools
|
source "package/linux-tools/Config.in"
|
|
endmenu
|
