69fc497df0
This patch introduces some support for device tree-enabled kernels. It replaces the former BR2_LINUX_KERNEL_DTS_FILE option that was microblaze-only, that was quite limited. This option was quite limited, first obviously because it was restricted to microblaze, but also because it targetted only external device tree source files, and allowed only to build simpleImages using the custom image name mechanism. This patch adds a much more generic one, that can work on basically every architecture that supports device tree. It allows to build both device tree source file that comes with the kernel source or to set the path to the device tree file to use so that one can use a custom device tree. Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com> Acked-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
276 lines
10 KiB
Makefile
276 lines
10 KiB
Makefile
###############################################################################
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#
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# Linux kernel target
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#
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###############################################################################
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LINUX_VERSION=$(call qstrip,$(BR2_LINUX_KERNEL_VERSION))
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LINUX_LICENSE = GPLv2
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LINUX_LICENSE_FILES = COPYING
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# Compute LINUX_SOURCE and LINUX_SITE from the configuration
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ifeq ($(LINUX_VERSION),custom)
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LINUX_TARBALL = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_TARBALL_LOCATION))
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LINUX_SITE = $(dir $(LINUX_TARBALL))
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LINUX_SOURCE = $(notdir $(LINUX_TARBALL))
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else ifeq ($(BR2_LINUX_KERNEL_CUSTOM_GIT),y)
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LINUX_SITE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_GIT_REPO_URL))
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LINUX_SITE_METHOD = git
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else
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LINUX_SOURCE = linux-$(LINUX_VERSION).tar.bz2
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# In X.Y.Z, get X and Y. We replace dots and dashes by spaces in order
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# to use the $(word) function. We support versions such as 3.1,
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# 2.6.32, 2.6.32-rc1, 3.0-rc6, etc.
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ifeq ($(findstring x2.6.,x$(LINUX_VERSION)),x2.6.)
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LINUX_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v2.6/
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else
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LINUX_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v3.x/
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endif
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# release candidates are in testing/ subdir
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ifneq ($(findstring -rc,$(LINUX_VERSION)),)
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LINUX_SITE := $(LINUX_SITE)testing/
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endif # -rc
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endif
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LINUX_PATCHES = $(call qstrip,$(BR2_LINUX_KERNEL_PATCH))
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LINUX_INSTALL_IMAGES = YES
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LINUX_DEPENDENCIES += host-module-init-tools
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LINUX_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="$(CCACHE) $(TARGET_CROSS)" \
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DEPMOD=$(HOST_DIR)/usr/sbin/depmod
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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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LINUX_VERSION_PROBED = $(shell $(MAKE) $(LINUX_MAKE_FLAGS) -C $(LINUX_DIR) --no-print-directory -s kernelrelease)
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ifeq ($(BR2_LINUX_KERNEL_USE_INTREE_DTS),y)
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KERNEL_DTS_NAME = $(BR2_LINUX_KERNEL_INTREE_DTS_NAME)
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else ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_DTS),y)
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KERNEL_DTS_NAME = $(basename $(notdir $(BR2_LINUX_KERNEL_CUSTOM_DTS_PATH)))
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endif
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ifeq ($(BR2_LINUX_KERNEL_IMAGE_TARGET_CUSTOM),y)
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LINUX_IMAGE_NAME=$(call qstrip,$(BR2_LINUX_KERNEL_IMAGE_TARGET_NAME))
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else
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ifeq ($(BR2_LINUX_KERNEL_UIMAGE),y)
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ifeq ($(KERNEL_ARCH),blackfin)
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# a uImage, but with a different file name
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LINUX_IMAGE_NAME=vmImage
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else
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LINUX_IMAGE_NAME=uImage
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endif
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LINUX_DEPENDENCIES+=host-uboot-tools
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else ifeq ($(BR2_LINUX_KERNEL_BZIMAGE),y)
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LINUX_IMAGE_NAME=bzImage
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else ifeq ($(BR2_LINUX_KERNEL_ZIMAGE),y)
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LINUX_IMAGE_NAME=zImage
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else ifeq ($(BR2_LINUX_KERNEL_VMLINUX_BIN),y)
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LINUX_IMAGE_NAME=vmlinux.bin
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else ifeq ($(BR2_LINUX_KERNEL_VMLINUX),y)
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LINUX_IMAGE_NAME=vmlinux
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else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ),y)
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LINUX_IMAGE_NAME=vmlinuz
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endif
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endif
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# Compute the arch path, since i386 and x86_64 are in arch/x86 and not
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# in arch/$(KERNEL_ARCH). Even if the kernel creates symbolic links
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# for bzImage, arch/i386 and arch/x86_64 do not exist when copying the
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# defconfig file.
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ifeq ($(KERNEL_ARCH),i386)
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KERNEL_ARCH_PATH=$(LINUX_DIR)/arch/x86
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else ifeq ($(KERNEL_ARCH),x86_64)
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KERNEL_ARCH_PATH=$(LINUX_DIR)/arch/x86
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else
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KERNEL_ARCH_PATH=$(LINUX_DIR)/arch/$(KERNEL_ARCH)
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endif
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ifeq ($(BR2_LINUX_KERNEL_VMLINUX),y)
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LINUX_IMAGE_PATH=$(LINUX_DIR)/$(LINUX_IMAGE_NAME)
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else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ),y)
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LINUX_IMAGE_PATH=$(LINUX_DIR)/$(LINUX_IMAGE_NAME)
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else
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ifeq ($(KERNEL_ARCH),avr32)
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LINUX_IMAGE_PATH=$(KERNEL_ARCH_PATH)/boot/images/$(LINUX_IMAGE_NAME)
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else
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LINUX_IMAGE_PATH=$(KERNEL_ARCH_PATH)/boot/$(LINUX_IMAGE_NAME)
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endif
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endif # BR2_LINUX_KERNEL_VMLINUX
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define LINUX_DOWNLOAD_PATCHES
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$(if $(LINUX_PATCHES),
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@$(call MESSAGE,"Download additional patches"))
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$(foreach patch,$(filter ftp://% http://%,$(LINUX_PATCHES)),\
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$(call DOWNLOAD,$(patch))$(sep))
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endef
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LINUX_POST_DOWNLOAD_HOOKS += LINUX_DOWNLOAD_PATCHES
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define LINUX_APPLY_PATCHES
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for p in $(LINUX_PATCHES) ; do \
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if echo $$p | grep -q -E "^ftp://|^http://" ; then \
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support/scripts/apply-patches.sh $(@D) $(DL_DIR) `basename $$p` ; \
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elif test -d $$p ; then \
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support/scripts/apply-patches.sh $(@D) $$p linux-\*.patch ; \
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else \
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support/scripts/apply-patches.sh $(@D) `dirname $$p` `basename $$p` ; \
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fi \
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done
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endef
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LINUX_POST_PATCH_HOOKS += LINUX_APPLY_PATCHES
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ifeq ($(BR2_LINUX_KERNEL_USE_DEFCONFIG),y)
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KERNEL_SOURCE_CONFIG = $(KERNEL_ARCH_PATH)/configs/$(call qstrip,$(BR2_LINUX_KERNEL_DEFCONFIG))_defconfig
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else ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG),y)
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KERNEL_SOURCE_CONFIG = $(BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE)
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endif
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define LINUX_CONFIGURE_CMDS
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cp $(KERNEL_SOURCE_CONFIG) $(KERNEL_ARCH_PATH)/configs/buildroot_defconfig
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$(TARGET_MAKE_ENV) $(MAKE1) $(LINUX_MAKE_FLAGS) -C $(@D) buildroot_defconfig
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rm $(KERNEL_ARCH_PATH)/configs/buildroot_defconfig
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$(if $(BR2_ARM_EABI),
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$(call KCONFIG_ENABLE_OPT,CONFIG_AEABI,$(@D)/.config),
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$(call KCONFIG_DISABLE_OPT,CONFIG_AEABI,$(@D)/.config))
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# As the kernel gets compiled before root filesystems are
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# built, we create a fake cpio file. It'll be
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# replaced later by the real cpio archive, and the kernel will be
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# rebuilt using the linux26-rebuild-with-initramfs target.
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$(if $(BR2_TARGET_ROOTFS_INITRAMFS),
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touch $(BINARIES_DIR)/rootfs.cpio
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$(call KCONFIG_ENABLE_OPT,CONFIG_BLK_DEV_INITRD,$(@D)/.config)
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$(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_SOURCE,\"$(BINARIES_DIR)/rootfs.cpio\",$(@D)/.config)
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$(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_ROOT_UID,0,$(@D)/.config)
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$(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_ROOT_GID,0,$(@D)/.config)
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$(call KCONFIG_DISABLE_OPT,CONFIG_INITRAMFS_COMPRESSION_NONE,$(@D)/.config)
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$(call KCONFIG_ENABLE_OPT,CONFIG_INITRAMFS_COMPRESSION_GZIP,$(@D)/.config))
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$(if $(BR2_ROOTFS_DEVICE_CREATION_STATIC),,
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$(call KCONFIG_ENABLE_OPT,CONFIG_DEVTMPFS,$(@D)/.config)
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$(call KCONFIG_ENABLE_OPT,CONFIG_DEVTMPFS_MOUNT,$(@D)/.config))
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$(if $(BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_MDEV),
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$(call KCONFIG_SET_OPT,CONFIG_UEVENT_HELPER_PATH,\"/sbin/mdev\",$(@D)/.config))
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$(if $(BR2_PACKAGE_SYSTEMD),
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$(call KCONFIG_ENABLE_OPT,CONFIG_CGROUPS,$(@D)/.config))
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yes '' | $(TARGET_MAKE_ENV) $(MAKE1) $(LINUX_MAKE_FLAGS) -C $(@D) oldconfig
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endef
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ifeq ($(BR2_LINUX_KERNEL_DTS_SUPPORT),y)
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define LINUX_BUILD_DTB
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$(TARGET_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(KERNEL_DTS_NAME).dtb
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endef
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define LINUX_INSTALL_DTB
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cp $(KERNEL_ARCH_PATH)/boot/$(KERNEL_DTS_NAME).dtb $(BINARIES_DIR)/
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endef
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endif
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# Compilation. We make sure the kernel gets rebuilt when the
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# configuration has changed.
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define LINUX_BUILD_CMDS
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$(if $(BR2_LINUX_KERNEL_USE_CUSTOM_DTS),
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cp $(BR2_LINUX_KERNEL_CUSTOM_DTS_PATH) $(KERNEL_ARCH_PATH)/boot/dts/)
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$(TARGET_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(LINUX_IMAGE_NAME)
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@if grep -q "CONFIG_MODULES=y" $(@D)/.config; then \
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$(TARGET_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) modules ; \
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fi
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$(LINUX_BUILD_DTB)
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endef
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ifeq ($(BR2_LINUX_KERNEL_INSTALL_TARGET),y)
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define LINUX_INSTALL_KERNEL_IMAGE_TO_TARGET
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install -m 0644 -D $(LINUX_IMAGE_PATH) $(TARGET_DIR)/boot/$(LINUX_IMAGE_NAME)
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endef
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endif
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define LINUX_INSTALL_HOST_TOOLS
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# Installing dtc (device tree compiler) as host tool, if selected
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if grep -q "CONFIG_DTC=y" $(@D)/.config; then \
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$(INSTALL) -D -m 0755 $(@D)/scripts/dtc/dtc $(HOST_DIR)/usr/bin/dtc ; \
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fi
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endef
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define LINUX_INSTALL_IMAGES_CMDS
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cp $(LINUX_IMAGE_PATH) $(BINARIES_DIR)
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endef
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define LINUX_INSTALL_TARGET_CMDS
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$(LINUX_INSTALL_KERNEL_IMAGE_TO_TARGET)
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$(LINUX_INSTALL_DTB)
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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 grep -q "CONFIG_MODULES=y" $(@D)/.config; then \
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$(TARGET_MAKE_ENV) $(MAKE1) $(LINUX_MAKE_FLAGS) -C $(@D) \
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DEPMOD="$(HOST_DIR)/usr/sbin/depmod" modules_install ; \
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rm -f $(TARGET_DIR)/lib/modules/$(LINUX_VERSION_PROBED)/build ; \
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rm -f $(TARGET_DIR)/lib/modules/$(LINUX_VERSION_PROBED)/source ; \
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fi
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$(LINUX_INSTALL_HOST_TOOLS)
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endef
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include linux/linux-ext-*.mk
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$(eval $(generic-package))
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ifeq ($(BR2_LINUX_KERNEL),y)
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linux-menuconfig linux-xconfig linux-gconfig linux-nconfig linux26-menuconfig linux26-xconfig linux26-gconfig linux26-nconfig: dirs linux-configure
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$(MAKE) $(LINUX_MAKE_FLAGS) -C $(LINUX_DIR) \
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$(subst linux-,,$(subst linux26-,,$@))
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rm -f $(LINUX_DIR)/.stamp_{built,target_installed,images_installed}
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linux-savedefconfig linux26-savedefconfig: dirs linux-configure
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$(MAKE) $(LINUX_MAKE_FLAGS) -C $(LINUX_DIR) \
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$(subst linux-,,$(subst linux26-,,$@))
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ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG),y)
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linux-update-config linux26-update-config: linux-configure $(LINUX_DIR)/.config
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cp -f $(LINUX_DIR)/.config $(BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE)
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linux-update-defconfig linux26-update-defconfig: linux-savedefconfig
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cp -f $(LINUX_DIR)/defconfig $(BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE)
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else
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linux-update-config linux26-update-config: ;
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linux-update-defconfig linux26-update-defconfig: ;
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endif
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endif
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# Support for rebuilding the kernel after the cpio archive has
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# been generated in $(BINARIES_DIR)/rootfs.cpio.
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$(LINUX_DIR)/.stamp_initramfs_rebuilt: $(LINUX_DIR)/.stamp_target_installed $(LINUX_DIR)/.stamp_images_installed $(BINARIES_DIR)/rootfs.cpio
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@$(call MESSAGE,"Rebuilding kernel with initramfs")
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# Build the kernel.
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$(TARGET_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(LINUX_IMAGE_NAME)
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# Copy the kernel image to its final destination
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cp $(LINUX_IMAGE_PATH) $(BINARIES_DIR)
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# If there is a .ub file copy it to the final destination
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test ! -f $(LINUX_IMAGE_PATH).ub || cp $(LINUX_IMAGE_PATH).ub $(BINARIES_DIR)
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$(Q)touch $@
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# The initramfs building code must make sure this target gets called
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# after it generated the initramfs list of files.
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linux-rebuild-with-initramfs linux26-rebuild-with-initramfs: $(LINUX_DIR)/.stamp_initramfs_rebuilt
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# Checks to give errors that the user can understand
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ifeq ($(filter source,$(MAKECMDGOALS)),)
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ifeq ($(BR2_LINUX_KERNEL_USE_DEFCONFIG),y)
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ifeq ($(call qstrip,$(BR2_LINUX_KERNEL_DEFCONFIG)),)
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$(error No kernel defconfig name specified, check your BR2_LINUX_KERNEL_DEFCONFIG setting)
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endif
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endif
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ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG),y)
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ifeq ($(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE)),)
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$(error No kernel configuration file specified, check your BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE setting)
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endif
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endif
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endif
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