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authorThomas Petazzoni <thomas.petazzoni@free-electrons.com>2010-04-03 16:46:46 (GMT)
committer Thomas Petazzoni <thomas.petazzoni@free-electrons.com>2010-06-22 19:20:25 (GMT)
commit487e21cff69b30b404146b2ffb46959a728a4002 (patch)
tree9d809fbe41eb64bf9f389216168526149827be68
parentcd7459b4eef742069f7796c4dfceed8facbfab68 (diff)
downloadbuildroot-487e21cff69b30b404146b2ffb46959a728a4002.tar.gz
buildroot-487e21cff69b30b404146b2ffb46959a728a4002.tar.bz2
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>
-rw-r--r--Config.in2
-rw-r--r--Makefile1
-rw-r--r--linux/Config.in133
-rw-r--r--linux/linux.mk118
4 files changed, 253 insertions, 1 deletions
diff --git a/Config.in b/Config.in
index f5eb859..0a07576 100644
--- a/Config.in
+++ b/Config.in
@@ -295,4 +295,4 @@ source "fs/Config.in"
source "boot/Config.in"
-source "target/Config.in"
+source "linux/Config.in"
diff --git a/Makefile b/Makefile
index 7e00b65..3bf23d9 100644
--- a/Makefile
+++ b/Makefile
@@ -323,6 +323,7 @@ endif
include boot/common.mk
include target/Makefile.in
+include linux/linux.mk
include fs/common.mk
TARGETS+=erase-fakeroots
diff --git a/linux/Config.in b/linux/Config.in
new file mode 100644
index 0000000..d8a5157
--- /dev/null
+++ b/linux/Config.in
@@ -0,0 +1,133 @@
+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_2_6_34
+
+config BR2_LINUX_KERNEL_2_6_34
+ bool "2.6.34"
+
+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
+
+endchoice
+
+config BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE
+ string "Kernel version"
+ depends on BR2_LINUX_KERNEL_CUSTOM_VERSION
+ default "2.6.34"
+
+config BR2_LINUX_KERNEL_CUSTOM_TARBALL_LOCATION
+ string "URL of custom kernel tarball"
+ depends on BR2_LINUX_KERNEL_CUSTOM_TARBALL
+
+config BR2_LINUX_KERNEL_VERSION
+ string
+ default "2.6.34" if BR2_LINUX_KERNEL_2_6_34
+ 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
+
+#
+# Patch selection
+#
+
+config BR2_LINUX_KERNEL_PATCH
+ string "Custom kernel patch"
+ help
+ The location can be an URL, a file path, or a directory. In
+ the case of a directory, all files matching linux-*.patch
+ 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 leading
+ _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"
+ default BR2_LINUX_KERNEL_UIMAGE if !BR2_i386 && !BR2_x86_64
+ default BR2_LINUX_KERNEL_BZIMAGE if BR2_i386 || BR2_x86_64
+
+config BR2_LINUX_KERNEL_UIMAGE
+ bool "uImage"
+
+config BR2_LINUX_KERNEL_BZIMAGE
+ bool "bzImage"
+
+config BR2_LINUX_KERNEL_ZIMAGE
+ bool "zImage"
+
+config BR2_LINUX_KERNEL_VMLINUX
+ bool "vmlinux"
+
+endchoice
+
+endif # BR2_LINUX_KERNEL
+
+endmenu
diff --git a/linux/linux.mk b/linux/linux.mk
new file mode 100644
index 0000000..3e91eca
--- /dev/null
+++ b/linux/linux.mk
@@ -0,0 +1,118 @@
+###############################################################################
+#
+# Linux kernel 2.6 target
+#
+###############################################################################
+LINUX26_VERSION=$(call qstrip,$(BR2_LINUX_KERNEL_VERSION))
+
+# Compute LINUX26_SOURCE and LINUX26_SITE from the configuration
+ifeq ($(LINUX26_VERSION),custom)
+LINUX26_TARBALL:=$(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_TARBALL_LOCATION))
+LINUX26_SITE:=$(dir $(LINUX26_TARBALL))
+LINUX26_SOURCE:=$(notdir $(LINUX26_TARBALL))
+else
+LINUX26_SOURCE:=linux-$(LINUX26_VERSION).tar.bz2
+LINUX26_SITE:=$(BR2_KERNEL_MIRROR)/linux/kernel/v2.6/
+endif
+
+LINUX26_DIR:=$(BUILD_DIR)/linux-$(LINUX26_VERSION)
+LINUX26_PATCH=$(call qstrip,$(BR2_LINUX_KERNEL_PATCH))
+
+LINUX26_MAKE_FLAGS = \
+ HOSTCC="$(HOSTCC)" \
+ HOSTCFLAGS="$(HOSTCFLAGS)" \
+ ARCH=$(KERNEL_ARCH) \
+ INSTALL_MOD_PATH=$(TARGET_DIR) \
+ CROSS_COMPILE=$(TARGET_CROSS) \
+ LDFLAGS="$(TARGET_LDFLAGS)" \
+ LZMA="$(LZMA)"
+
+# Get the real Linux version, which tells us where kernel modules are
+# going to be installed in the target filesystem.
+LINUX26_VERSION_PROBED = $(shell $(MAKE) $(LINUX26_MAKE_FLAGS) -C $(LINUX26_DIR) --no-print-directory -s kernelrelease)
+
+ifeq ($(BR2_LINUX_KERNEL_UIMAGE),y)
+LINUX26_IMAGE_NAME=uImage
+LINUX26_DEPENDENCIES+=$(MKIMAGE)
+else ifeq ($(BR2_LINUX_KERNEL_BZIMAGE),y)
+LINUX26_IMAGE_NAME=bzImage
+else ifeq ($(BR2_LINUX_KERNEL_ZIMAGE),y)
+LINUX26_IMAGE_NAME=zImage
+else ifeq ($(BR2_LINUX_KERNEL_VMLINUX),y)
+LINUX26_IMAGE_NAME=vmlinux.bin
+endif
+
+LINUX26_IMAGE_PATH=$(LINUX26_DIR)/arch/$(KERNEL_ARCH)/boot/$(LINUX26_IMAGE_NAME)
+
+# Download
+$(LINUX26_DIR)/.stamp_downloaded:
+ @$(call MESSAGE,"Downloading kernel")
+ $(call DOWNLOAD,$(LINUX26_SITE),$(LINUX26_SOURCE))
+ifneq ($(filter ftp://% http://%,$(LINUX26_PATCH)),)
+ $(call DOWNLOAD,$(dir $(LINUX26_PATCH)),$(notdir $(LINUX26_PATCH)))
+endif
+ mkdir -p $(@D)
+ touch $@
+
+# Extraction
+$(LINUX26_DIR)/.stamp_extracted: $(LINUX26_DIR)/.stamp_downloaded
+ @$(call MESSAGE,"Extracting kernel")
+ mkdir -p $(@D)
+ $(Q)$(INFLATE$(suffix $(LINUX26_SOURCE))) $(DL_DIR)/$(LINUX26_SOURCE) | \
+ tar -C $(@D) $(TAR_STRIP_COMPONENTS)=1 $(TAR_OPTIONS) -
+ $(Q)touch $@
+
+# Patch
+$(LINUX26_DIR)/.stamp_patched: $(LINUX26_DIR)/.stamp_extracted
+ @$(call MESSAGE,"Patching kernel")
+ifneq ($(LINUX26_PATCH),)
+ifneq ($(filter ftp://% http://%,$(LINUX26_PATCH)),)
+ toolchain/patch-kernel.sh $(@D) $(DL_DIR) $(notdir $(LINUX26_PATCH))
+else ifeq ($(shell test -d $(LINUX26_PATCH) && echo "dir"),dir)
+ toolchain/patch-kernel.sh $(@D) $(LINUX26_PATCH) linux-\*.patch
+else
+ toolchain/patch-kernel.sh $(@D) $(dir $(LINUX26_PATCH)) $(notdir $(LINUX26_PATCH))
+endif
+endif
+ $(Q)touch $@
+
+
+# Configuration
+$(LINUX26_DIR)/.stamp_configured: $(LINUX26_DIR)/.stamp_patched
+ @$(call MESSAGE,"Configuring kernel")
+ifeq ($(BR2_LINUX_KERNEL_USE_DEFCONFIG),y)
+ $(TARGET_MAKE_ENV) $(MAKE1) $(LINUX26_MAKE_FLAGS) -C $(@D) $(call qstrip,$(BR2_LINUX_KERNEL_DEFCONFIG))_defconfig
+else ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG),y)
+ cp $(BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE) $(@D)/.config
+endif
+ $(TARGET_MAKE_ENV) $(MAKE) $(LINUX26_MAKE_FLAGS) -C $(@D) oldconfig
+ $(Q)touch $@
+
+# Compilation
+$(LINUX26_DIR)/.stamp_compiled: $(LINUX26_DIR)/.stamp_configured
+ @$(call MESSAGE,"Compiling kernel")
+ $(TARGET_MAKE_ENV) $(MAKE) $(LINUX26_MAKE_FLAGS) -C $(@D) $(LINUX26_IMAGE_NAME)
+ @if [ $(shell grep -c "CONFIG_MODULES=y" $(LINUX26_DIR)/.config) != 0 ] ; then \
+ $(TARGET_MAKE_ENV) $(MAKE) $(LINUX26_MAKE_FLAGS) -C $(@D) modules ; \
+ fi
+ $(Q)touch $@
+
+# Installation
+$(LINUX26_DIR)/.stamp_installed: $(LINUX26_DIR)/.stamp_compiled
+ @$(call MESSAGE,"Installing kernel")
+ cp $(LINUX26_IMAGE_PATH) $(BINARIES_DIR)
+ # Install modules and remove symbolic links pointing to build
+ # directories, not relevant on the target
+ @if [ $(shell grep -c "CONFIG_MODULES=y" $(LINUX26_DIR)/.config) != 0 ] ; then \
+ $(TARGET_MAKE_ENV) $(MAKE1) $(LINUX26_MAKE_FLAGS) -C $(@D) \
+ INSTALL_MOD_PATH=$(TARGET_DIR) modules_install ; \
+ rm -f $(TARGET_DIR)/lib/modules/$(LINUX26_VERSION_PROBED)/build ; \
+ rm -f $(TARGET_DIR)/lib/modules/$(LINUX26_VERSION_PROBED)/source ; \
+ fi
+ $(Q)touch $@
+
+linux26: $(LINUX26_DEPENDENCIES) $(LINUX26_DIR)/.stamp_installed
+
+ifeq ($(BR2_LINUX_KERNEL),y)
+TARGETS+=linux26
+endif