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New, simpler, infrastructure for building the Linux kernel
This patch introduces a single, simple, infrastructure to build the Linux kernel. The configuration is limited to : * Kernel version: a fixed recent stable version, same as kernel headers version (for internal toolchains only), custom stable version, or custom tarball URL * Kernel patch: either a local file, directory or an URL * Kernel configuration: either the name of a defconfig or the location of a custom configuration file * Kernel image: either uImage, bzImage, zImage or vmlinux. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
This commit is contained in:
Thomas Petazzoni
parent
cd7459b4ee
commit
487e21cff6
@ -295,4 +295,4 @@ source "fs/Config.in"
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source "boot/Config.in"
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source "target/Config.in"
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source "linux/Config.in"
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1
Makefile
1
Makefile
@ -323,6 +323,7 @@ endif
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include boot/common.mk
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include target/Makefile.in
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include linux/linux.mk
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include fs/common.mk
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TARGETS+=erase-fakeroots
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133
linux/Config.in
Normal file
133
linux/Config.in
Normal file
@ -0,0 +1,133 @@
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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_2_6_34
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config BR2_LINUX_KERNEL_2_6_34
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bool "2.6.34"
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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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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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default "2.6.34"
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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_VERSION
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string
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default "2.6.34" if BR2_LINUX_KERNEL_2_6_34
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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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#
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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 patch"
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help
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The location can be an URL, a file path, or a directory. In
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the case of a directory, all files matching linux-*.patch
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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 defconfig file to use, without the leading
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_defconfig
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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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default BR2_LINUX_KERNEL_UIMAGE if !BR2_i386 && !BR2_x86_64
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default BR2_LINUX_KERNEL_BZIMAGE if BR2_i386 || BR2_x86_64
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config BR2_LINUX_KERNEL_UIMAGE
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bool "uImage"
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config BR2_LINUX_KERNEL_BZIMAGE
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bool "bzImage"
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config BR2_LINUX_KERNEL_ZIMAGE
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bool "zImage"
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config BR2_LINUX_KERNEL_VMLINUX
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bool "vmlinux"
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endchoice
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endif # BR2_LINUX_KERNEL
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endmenu
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118
linux/linux.mk
Normal file
118
linux/linux.mk
Normal file
@ -0,0 +1,118 @@
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###############################################################################
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#
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# Linux kernel 2.6 target
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#
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###############################################################################
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LINUX26_VERSION=$(call qstrip,$(BR2_LINUX_KERNEL_VERSION))
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# Compute LINUX26_SOURCE and LINUX26_SITE from the configuration
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ifeq ($(LINUX26_VERSION),custom)
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LINUX26_TARBALL:=$(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_TARBALL_LOCATION))
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LINUX26_SITE:=$(dir $(LINUX26_TARBALL))
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LINUX26_SOURCE:=$(notdir $(LINUX26_TARBALL))
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else
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LINUX26_SOURCE:=linux-$(LINUX26_VERSION).tar.bz2
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LINUX26_SITE:=$(BR2_KERNEL_MIRROR)/linux/kernel/v2.6/
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endif
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LINUX26_DIR:=$(BUILD_DIR)/linux-$(LINUX26_VERSION)
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LINUX26_PATCH=$(call qstrip,$(BR2_LINUX_KERNEL_PATCH))
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LINUX26_MAKE_FLAGS = \
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HOSTCC="$(HOSTCC)" \
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HOSTCFLAGS="$(HOSTCFLAGS)" \
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ARCH=$(KERNEL_ARCH) \
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INSTALL_MOD_PATH=$(TARGET_DIR) \
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CROSS_COMPILE=$(TARGET_CROSS) \
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LDFLAGS="$(TARGET_LDFLAGS)" \
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LZMA="$(LZMA)"
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# Get the real Linux version, which tells us where kernel modules are
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# going to be installed in the target filesystem.
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LINUX26_VERSION_PROBED = $(shell $(MAKE) $(LINUX26_MAKE_FLAGS) -C $(LINUX26_DIR) --no-print-directory -s kernelrelease)
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ifeq ($(BR2_LINUX_KERNEL_UIMAGE),y)
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LINUX26_IMAGE_NAME=uImage
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LINUX26_DEPENDENCIES+=$(MKIMAGE)
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else ifeq ($(BR2_LINUX_KERNEL_BZIMAGE),y)
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LINUX26_IMAGE_NAME=bzImage
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else ifeq ($(BR2_LINUX_KERNEL_ZIMAGE),y)
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LINUX26_IMAGE_NAME=zImage
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else ifeq ($(BR2_LINUX_KERNEL_VMLINUX),y)
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LINUX26_IMAGE_NAME=vmlinux.bin
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endif
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LINUX26_IMAGE_PATH=$(LINUX26_DIR)/arch/$(KERNEL_ARCH)/boot/$(LINUX26_IMAGE_NAME)
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# Download
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$(LINUX26_DIR)/.stamp_downloaded:
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@$(call MESSAGE,"Downloading kernel")
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$(call DOWNLOAD,$(LINUX26_SITE),$(LINUX26_SOURCE))
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ifneq ($(filter ftp://% http://%,$(LINUX26_PATCH)),)
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$(call DOWNLOAD,$(dir $(LINUX26_PATCH)),$(notdir $(LINUX26_PATCH)))
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endif
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mkdir -p $(@D)
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touch $@
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# Extraction
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$(LINUX26_DIR)/.stamp_extracted: $(LINUX26_DIR)/.stamp_downloaded
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@$(call MESSAGE,"Extracting kernel")
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mkdir -p $(@D)
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$(Q)$(INFLATE$(suffix $(LINUX26_SOURCE))) $(DL_DIR)/$(LINUX26_SOURCE) | \
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tar -C $(@D) $(TAR_STRIP_COMPONENTS)=1 $(TAR_OPTIONS) -
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$(Q)touch $@
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# Patch
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$(LINUX26_DIR)/.stamp_patched: $(LINUX26_DIR)/.stamp_extracted
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@$(call MESSAGE,"Patching kernel")
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ifneq ($(LINUX26_PATCH),)
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ifneq ($(filter ftp://% http://%,$(LINUX26_PATCH)),)
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toolchain/patch-kernel.sh $(@D) $(DL_DIR) $(notdir $(LINUX26_PATCH))
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else ifeq ($(shell test -d $(LINUX26_PATCH) && echo "dir"),dir)
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toolchain/patch-kernel.sh $(@D) $(LINUX26_PATCH) linux-\*.patch
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else
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toolchain/patch-kernel.sh $(@D) $(dir $(LINUX26_PATCH)) $(notdir $(LINUX26_PATCH))
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endif
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endif
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$(Q)touch $@
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# Configuration
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$(LINUX26_DIR)/.stamp_configured: $(LINUX26_DIR)/.stamp_patched
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@$(call MESSAGE,"Configuring kernel")
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ifeq ($(BR2_LINUX_KERNEL_USE_DEFCONFIG),y)
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$(TARGET_MAKE_ENV) $(MAKE1) $(LINUX26_MAKE_FLAGS) -C $(@D) $(call qstrip,$(BR2_LINUX_KERNEL_DEFCONFIG))_defconfig
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else ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG),y)
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cp $(BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE) $(@D)/.config
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endif
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$(TARGET_MAKE_ENV) $(MAKE) $(LINUX26_MAKE_FLAGS) -C $(@D) oldconfig
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$(Q)touch $@
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# Compilation
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$(LINUX26_DIR)/.stamp_compiled: $(LINUX26_DIR)/.stamp_configured
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@$(call MESSAGE,"Compiling kernel")
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$(TARGET_MAKE_ENV) $(MAKE) $(LINUX26_MAKE_FLAGS) -C $(@D) $(LINUX26_IMAGE_NAME)
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@if [ $(shell grep -c "CONFIG_MODULES=y" $(LINUX26_DIR)/.config) != 0 ] ; then \
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$(TARGET_MAKE_ENV) $(MAKE) $(LINUX26_MAKE_FLAGS) -C $(@D) modules ; \
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fi
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$(Q)touch $@
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# Installation
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$(LINUX26_DIR)/.stamp_installed: $(LINUX26_DIR)/.stamp_compiled
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@$(call MESSAGE,"Installing kernel")
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cp $(LINUX26_IMAGE_PATH) $(BINARIES_DIR)
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# Install modules and remove symbolic links pointing to build
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# directories, not relevant on the target
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@if [ $(shell grep -c "CONFIG_MODULES=y" $(LINUX26_DIR)/.config) != 0 ] ; then \
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$(TARGET_MAKE_ENV) $(MAKE1) $(LINUX26_MAKE_FLAGS) -C $(@D) \
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INSTALL_MOD_PATH=$(TARGET_DIR) modules_install ; \
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rm -f $(TARGET_DIR)/lib/modules/$(LINUX26_VERSION_PROBED)/build ; \
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rm -f $(TARGET_DIR)/lib/modules/$(LINUX26_VERSION_PROBED)/source ; \
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fi
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$(Q)touch $@
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linux26: $(LINUX26_DEPENDENCIES) $(LINUX26_DIR)/.stamp_installed
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ifeq ($(BR2_LINUX_KERNEL),y)
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TARGETS+=linux26
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endif
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