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kumquat-buildroot/linux/linux.mk
Thomas Petazzoni f45f775b4f linux: add support for 3.x and -rc versions 
The assumption that all kernels are in
http://www.kernel.org/pub/linux/kernel/v2.6/ is no longer true:
versions 3.x are in separate directories.

We now compute the directory name from the major and minor versions of
the version provided by the user. This assumes that the 3.1 version
will be in a /v3.1/ directory, which we don't know yet because the 3.1
cycle hasn't started yet.

At the same time, we add support for the official -rcX versions.

Patch tested by compiling 3.0-rc6, which Buildroot has successfully
downloaded and built.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
2011-07-11 23:43:48 +02:00

219 lines
8.3 KiB
Makefile
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###############################################################################
#
# Linux kernel target
#
###############################################################################
LINUX_VERSION=$(call qstrip,$(BR2_LINUX_KERNEL_VERSION))
# Compute LINUX_SOURCE and LINUX_SITE from the configuration
ifeq ($(LINUX_VERSION),custom)
LINUX_TARBALL = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_TARBALL_LOCATION))
LINUX_SITE = $(dir $(LINUX_TARBALL))
LINUX_SOURCE = $(notdir $(LINUX_TARBALL))
else ifeq ($(BR2_LINUX_KERNEL_CUSTOM_GIT),y)
LINUX_SITE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_GIT_REPO_URL))
LINUX_SITE_METHOD = git
else
LINUX_SOURCE = linux-$(LINUX_VERSION).tar.bz2
# In X.Y.Z, get X and Y. We replace dots and dashes by spaces in order
# to use the $(word) function. We support versions such as 3.1,
# 2.6.32, 2.6.32-rc1, 3.0-rc6, etc.
LINUX_VERSION_MAJOR = $(word 1,$(subst ., ,$(subst -, ,$(LINUX_VERSION))))
LINUX_VERSION_MINOR = $(word 2,$(subst ., ,$(subst -, ,$(LINUX_VERSION))))
LINUX_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v$(LINUX_VERSION_MAJOR).$(LINUX_VERSION_MINOR)/
# release candidates are in testing/ subdir
ifneq ($(findstring -rc,$(LINUX_VERSION)),)
LINUX_SITE = $(LINUX_SITE)testing/
endif # -rc
endif
LINUX_PATCHES = $(call qstrip,$(BR2_LINUX_KERNEL_PATCH))
LINUX_INSTALL_IMAGES = YES
LINUX_DEPENDENCIES += host-module-init-tools
LINUX_MAKE_FLAGS = \
HOSTCC="$(HOSTCC)" \
HOSTCFLAGS="$(HOSTCFLAGS)" \
ARCH=$(KERNEL_ARCH) \
INSTALL_MOD_PATH=$(TARGET_DIR) \
CROSS_COMPILE="$(CCACHE) $(TARGET_CROSS)" \
LZMA="$(LZMA)"
# Get the real Linux version, which tells us where kernel modules are
# going to be installed in the target filesystem.
LINUX_VERSION_PROBED = $(shell $(MAKE) $(LINUX_MAKE_FLAGS) -C $(LINUX_DIR) --no-print-directory -s kernelrelease)
ifeq ($(BR2_LINUX_KERNEL_IMAGE_TARGET_CUSTOM),y)
LINUX_IMAGE_NAME=$(call qstrip,$(BR2_LINUX_KERNEL_IMAGE_TARGET_NAME))
else
ifeq ($(BR2_LINUX_KERNEL_UIMAGE),y)
ifeq ($(KERNEL_ARCH),blackfin)
# a uImage, but with a different file name
LINUX_IMAGE_NAME=vmImage
else
LINUX_IMAGE_NAME=uImage
endif
LINUX_DEPENDENCIES+=host-uboot-mkimage
else ifeq ($(BR2_LINUX_KERNEL_BZIMAGE),y)
LINUX_IMAGE_NAME=bzImage
else ifeq ($(BR2_LINUX_KERNEL_ZIMAGE),y)
LINUX_IMAGE_NAME=zImage
else ifeq ($(BR2_LINUX_KERNEL_VMLINUX_BIN),y)
LINUX_IMAGE_NAME=vmlinux.bin
else ifeq ($(BR2_LINUX_KERNEL_VMLINUX),y)
LINUX_IMAGE_NAME=vmlinux
endif
endif
# Compute the arch path, since i386 and x86_64 are in arch/x86 and not
# in arch/$(KERNEL_ARCH). Even if the kernel creates symbolic links
# for bzImage, arch/i386 and arch/x86_64 do not exist when copying the
# defconfig file.
ifeq ($(KERNEL_ARCH),i386)
KERNEL_ARCH_PATH=$(LINUX_DIR)/arch/x86
else ifeq ($(KERNEL_ARCH),x86_64)
KERNEL_ARCH_PATH=$(LINUX_DIR)/arch/x86
else
KERNEL_ARCH_PATH=$(LINUX_DIR)/arch/$(KERNEL_ARCH)
endif
ifeq ($(BR2_LINUX_KERNEL_VMLINUX),y)
LINUX_IMAGE_PATH=$(LINUX_DIR)/$(LINUX_IMAGE_NAME)
else
ifeq ($(KERNEL_ARCH),avr32)
LINUX_IMAGE_PATH=$(KERNEL_ARCH_PATH)/boot/images/$(LINUX_IMAGE_NAME)
else
LINUX_IMAGE_PATH=$(KERNEL_ARCH_PATH)/boot/$(LINUX_IMAGE_NAME)
endif
endif # BR2_LINUX_KERNEL_VMLINUX
define LINUX_DOWNLOAD_PATCHES
$(if $(LINUX_PATCHES),
@$(call MESSAGE,"Download additional patches"))
$(foreach patch,$(filter ftp://% http://%,$(LINUX_PATCHES)),\
$(call DOWNLOAD,$(dir $(patch)),$(notdir $(patch)))$(sep))
endef
LINUX_POST_DOWNLOAD_HOOKS += LINUX_DOWNLOAD_PATCHES
define LINUX_APPLY_PATCHES
for p in $(LINUX_PATCHES) ; do \
if echo $$p | grep -q -E "^ftp://|^http://" ; then \
toolchain/patch-kernel.sh $(@D) $(DL_DIR) `basename $$p` ; \
elif test -d $$p ; then \
toolchain/patch-kernel.sh $(@D) $$p linux-\*.patch ; \
else \
toolchain/patch-kernel.sh $(@D) `dirname $$p` `basename $$p` ; \
fi \
done
endef
LINUX_POST_PATCH_HOOKS += LINUX_APPLY_PATCHES
ifeq ($(BR2_LINUX_KERNEL_USE_DEFCONFIG),y)
KERNEL_SOURCE_CONFIG = $(KERNEL_ARCH_PATH)/configs/$(call qstrip,$(BR2_LINUX_KERNEL_DEFCONFIG))_defconfig
else ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG),y)
KERNEL_SOURCE_CONFIG = $(BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE)
endif
define LINUX_CONFIGURE_CMDS
cp $(KERNEL_SOURCE_CONFIG) $(KERNEL_ARCH_PATH)/configs/buildroot_defconfig
$(TARGET_MAKE_ENV) $(MAKE1) $(LINUX_MAKE_FLAGS) -C $(@D) buildroot_defconfig
rm $(KERNEL_ARCH_PATH)/configs/buildroot_defconfig
$(if $(BR2_ARM_EABI),
$(call KCONFIG_ENABLE_OPT,CONFIG_AEABI,$(@D)/.config),
$(call KCONFIG_DISABLE_OPT,CONFIG_AEABI,$(@D)/.config))
# As the kernel gets compiled before root filesystems are
# built, we create a fake initramfs file list. It'll be
# replaced later by the real list, and the kernel will be
# rebuilt using the linux26-rebuild-with-initramfs target.
$(if $(BR2_TARGET_ROOTFS_INITRAMFS),
touch $(BINARIES_DIR)/rootfs.initramfs
$(call KCONFIG_ENABLE_OPT,CONFIG_BLK_DEV_INITRD,$(@D)/.config)
$(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_SOURCE,\"$(BINARIES_DIR)/rootfs.initramfs\",$(@D)/.config)
$(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_ROOT_UID,0,$(@D)/.config)
$(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_ROOT_GID,0,$(@D)/.config)
$(call KCONFIG_DISABLE_OPT,CONFIG_INITRAMFS_COMPRESSION_NONE,$(@D)/.config)
$(call KCONFIG_ENABLE_OPT,CONFIG_INITRAMFS_COMPRESSION_GZIP,$(@D)/.config))
$(if $(BR2_ROOTFS_DEVICE_CREATION_STATIC),,
$(call KCONFIG_ENABLE_OPT,CONFIG_DEVTMPFS,$(@D)/.config)
$(call KCONFIG_ENABLE_OPT,CONFIG_DEVTMPFS_MOUNT,$(@D)/.config))
$(if $(BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_MDEV),
$(call KCONFIG_SET_OPT,CONFIG_UEVENT_HELPER_PATH,\"/sbin/mdev\",$(@D)/.config))
yes '' | $(TARGET_MAKE_ENV) $(MAKE1) $(LINUX_MAKE_FLAGS) -C $(@D) oldconfig
endef
# Compilation. We make sure the kernel gets rebuilt when the
# configuration has changed.
define LINUX_BUILD_CMDS
$(TARGET_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(LINUX_IMAGE_NAME)
@if grep -q "CONFIG_MODULES=y" $(@D)/.config; then \
$(TARGET_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) modules ; \
fi
endef
ifeq ($(BR2_LINUX_KERNEL_INSTALL_TARGET),y)
define LINUX_INSTALL_KERNEL_IMAGE_TO_TARGET
install -m 0644 -D $(LINUX_IMAGE_PATH) $(TARGET_DIR)/boot/$(LINUX_IMAGE_NAME)
endef
endif
define LINUX_INSTALL_IMAGES_CMDS
cp $(LINUX_IMAGE_PATH) $(BINARIES_DIR)
endef
define LINUX_INSTALL_TARGET_CMDS
$(LINUX_INSTALL_KERNEL_IMAGE_TO_TARGET)
# Install modules and remove symbolic links pointing to build
# directories, not relevant on the target
@if grep -q "CONFIG_MODULES=y" $(@D)/.config; then \
$(TARGET_MAKE_ENV) $(MAKE1) $(LINUX_MAKE_FLAGS) -C $(@D) \
DEPMOD="$(HOST_DIR)/usr/sbin/depmod" modules_install ; \
rm -f $(TARGET_DIR)/lib/modules/$(LINUX_VERSION_PROBED)/build ; \
rm -f $(TARGET_DIR)/lib/modules/$(LINUX_VERSION_PROBED)/source ; \
fi
endef
$(eval $(call GENTARGETS,,linux))
linux-menuconfig linux-xconfig linux-gconfig linux-nconfig linux26-menuconfig linux26-xconfig linux26-gconfig linux26-nconfig: dirs $(LINUX_DIR)/.stamp_configured
$(MAKE) $(LINUX_MAKE_FLAGS) -C $(LINUX_DIR) \
$(subst linux-,,$(subst linux26-,,$@))
rm -f $(LINUX_DIR)/.stamp_{built,target_installed,images_installed}
# Support for rebuilding the kernel after the initramfs file list has
# been generated in $(BINARIES_DIR)/rootfs.initramfs.
$(LINUX_DIR)/.stamp_initramfs_rebuilt: $(LINUX_DIR)/.stamp_target_installed $(LINUX_DIR)/.stamp_images_installed $(BINARIES_DIR)/rootfs.initramfs
@$(call MESSAGE,"Rebuilding kernel with initramfs")
# Remove the previously generated initramfs which was empty,
# to make sure the kernel will actually regenerate it.
$(RM) -f $(@D)/usr/initramfs_data.cpio*
# Build the kernel.
$(TARGET_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(LINUX_IMAGE_NAME)
# Copy the kernel image to its final destination
cp $(LINUX_IMAGE_PATH) $(BINARIES_DIR)
$(Q)touch $@
# The initramfs building code must make sure this target gets called
# after it generated the initramfs list of files.
linux-rebuild-with-initramfs linux26-rebuild-with-initramfs: $(LINUX_DIR)/.stamp_initramfs_rebuilt
# Checks to give errors that the user can understand
ifeq ($(filter source,$(MAKECMDGOALS)),)
ifeq ($(BR2_LINUX_KERNEL_USE_DEFCONFIG),y)
ifeq ($(call qstrip,$(BR2_LINUX_KERNEL_DEFCONFIG)),)
$(error No kernel defconfig name specified, check your BR2_LINUX_KERNEL_DEFCONFIG setting)
endif
endif
ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG),y)
ifeq ($(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE)),)
$(error No kernel configuration file specified, check your BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE setting)
endif
endif
endif
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