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authorGravatar Thomas Petazzoni <thomas.petazzoni@free-electrons.com>2010-04-03 18:46:46 +0200
committerGravatar Thomas Petazzoni <thomas.petazzoni@free-electrons.com>2010-06-22 21:20:25 +0200
commit487e21cff69b30b404146b2ffb46959a728a4002 (patch)
tree9d809fbe41eb64bf9f389216168526149827be68 /linux/linux.mk
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>
Diffstat (limited to 'linux/linux.mk')
-rw-r--r--linux/linux.mk118
1 files changed, 118 insertions, 0 deletions
diff --git a/linux/linux.mk b/linux/linux.mk
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+++ b/linux/linux.mk
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+###############################################################################
+#
+# 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