分析代码：################################################################################
#
#
Linux kernel target
#
################################################################################
LINUX_VERSION
= $(call qstrip,
$(BR2_
LINUX_
KERNEL_VERSION
))
LINUX_LICENSE
= GPLv2
LINUX_LICENSE_FILES
= COPYING
# Compute
LINUX_SOURCE and
LINUX_SITE from the configuration
ifeq
($(BR2_
LINUX_
KERNEL_CUSTOM_TARBALL
),y
)
LINUX_TARBALL
= $(call qstrip,
$(BR2_
LINUX_
KERNEL_CUSTOM_TARBALL_LOCATION
))
LINUX_SITE
= $(patsubst %/,%,
$(dir
$(LINUX_TARBALL
)))
LINUX_SOURCE
= $(notdir
$(LINUX_TARBALL
))
BR_NO_CHECK_HASH_FOR +
= $(LINUX_SOURCE
)
else ifeq
($(BR2_
LINUX_
KERNEL_CUSTOM_LOCAL
),y
)
LINUX_SITE
= $(call qstrip,
$(BR2_
LINUX_
KERNEL_CUSTOM_LOCAL_
PATH))
LINUX_SITE_METHOD
= local
else ifeq
($(BR2_
LINUX_
KERNEL_CUSTOM_GIT
),y
)
LINUX_SITE
= $(call qstrip,
$(BR2_
LINUX_
KERNEL_CUSTOM_REPO_URL
))
LINUX_SITE_METHOD
= git
else ifeq
($(BR2_
LINUX_
KERNEL_CUSTOM_HG
),y
)
LINUX_SITE
= $(call qstrip,
$(BR2_
LINUX_
KERNEL_CUSTOM_REPO_URL
))
LINUX_SITE_METHOD
= hg
else
LINUX_SOURCE
= linux-$(LINUX_VERSION
).tar.xz
ifeq
($(BR2_
LINUX_
KERNEL_CUSTOM_VERSION
),y
)
BR_NO_CHECK_HASH_FOR +
= $(LINUX_SOURCE
)
endif
ifeq
($(BR2_
LINUX_
KERNEL_SAME_AS_HEADERS
)$(BR2_
KERNEL_HEADERS_VERSION
),yy
)
BR_NO_CHECK_HASH_FOR +
= $(LINUX_SOURCE
)
endif
# In X.Y.Z, get X and Y. We replace dots and dashes by spaces in order
# to use the
$(word
) function. We support versions such as 4.0, 3.1,
# 2.6.32, 2.6.32
-rc1, 3.0
-rc6, etc.
ifeq
($(findstring x2.6.,x
$(LINUX_VERSION
)),x2.6.
)
LINUX_SITE
= $(BR2_
KERNEL_MIRROR
)/
linux/
kernel/v2.6
else ifeq
($(findstring x3.,x
$(LINUX_VERSION
)),x3.
)
LINUX_SITE
= $(BR2_
KERNEL_MIRROR
)/
linux/
kernel/v3.x
else ifeq
($(findstring x4.,x
$(LINUX_VERSION
)),x4.
)
LINUX_SITE
= $(BR2_
KERNEL_MIRROR
)/
linux/
kernel/v4.x
endif
# release candidates are in testing/ subdir
ifneq
($(findstring
-rc,
$(LINUX_VERSION
)),
)
LINUX_SITE :
= $(LINUX_SITE
)/testing
endif #
-rc
endif
LINUX_PATCHES
= $(call qstrip,
$(BR2_
LINUX_
KERNEL_PATCH
))
# We rely on the generic package infrastructure to download and apply
# remote patches
(downloaded from ftp, http or https
). For local
# patches, we can't rely on that infrastructure, because there might
# be directories in the patch list
(unlike for other packages
).
LINUX_PATCH
= $(filter ftp://% http://% https://%,
$(LINUX_PATCHES
))
LINUX_INSTALL_IMAGES
= YES
LINUX_DEPENDENCIES +
= host
-kmod host
-lzop host
-lzma
ifeq
($(BR2_
LINUX_
KERNEL_UBOOT_IMAGE
),y
)
LINUX_DEPENDENCIES +
= host
-uboot
-tools
endif
LINUX_
MAKE_FLAGS
= \
HOSTCC
="
$(HOSTCC
)" \
HOSTCFLAGS
="
$(HOSTCFLAGS
)" \
ARCH
=$(KERNEL_ARCH
) \
INSTALL_MOD_
PATH=$(TARGET_DIR
) \
CROSS_COMPILE
="
$(TARGET_CROSS
)" \
DEPMOD
=$(HOST_DIR
)/sbin/depmod
LINUX_
MAKE_ENV
= \
$(TARGET_
MAKE_ENV
) \
BR_BINARIES_DIR
=$(BINARIES_DIR
)
# Get the real
Linux version, which tells us where
kernel modules are
# going to be installed in the target filesystem.
LINUX_VERSION_PROBED
= `
$(MAKE) $(LINUX_
MAKE_FLAGS
) -C
$(LINUX_DIR
) --no
-print
-directory
-s
kernelrelease 2>/dev/null`
ifeq
($(BR2_
LINUX_
KERNEL_USE_INTREE_DTS
),y
)
KERNEL_DTS_NAME
= $(call qstrip,
$(BR2_
LINUX_
KERNEL_INTREE_DTS_NAME
))
else ifeq
($(BR2_
LINUX_
KERNEL_USE_CUSTOM_DTS
),y
)
# We keep only the .dts files, so that the user can specify both .dts
# and .dtsi files in BR2_
LINUX_
KERNEL_CUSTOM_DTS_
PATH. Both will be
# copied to arch/<arch>/boot/dts, but only the .dts files will
# actually be generated as .dtb.
KERNEL_DTS_NAME
= $(basename
$(filter %.dts,
$(notdir
$(call qstrip,
$(BR2_
LINUX_
KERNEL_CUSTOM_DTS_
PATH)))))
endif
KERNEL_DTBS
= $(addsuffix .dtb,
$(KERNEL_DTS_NAME
))
ifeq
($(BR2_
LINUX_
KERNEL_IMAGE_TARGET_CUSTOM
),y
)
LINUX_IMAGE_NAME
= $(call qstrip,
$(BR2_
LINUX_
KERNEL_IMAGE_NAME
))
LINUX_TARGET_NAME
= $(call qstrip,
$(BR2_
LINUX_
KERNEL_IMAGE_TARGET_NAME
))
ifeq
($(LINUX_IMAGE_NAME
),
)
LINUX_IMAGE_NAME
= $(LINUX_TARGET_NAME
)
endif
else
ifeq
($(BR2_
LINUX_
KERNEL_UIMAGE
),y
)
LINUX_IMAGE_NAME
= uImage
else ifeq
($(BR2_
LINUX_
KERNEL_APPENDED_UIMAGE
),y
)
LINUX_IMAGE_NAME
= uImage
else ifeq
($(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_ZIMAGE_EPAPR
),y
)
LINUX_IMAGE_NAME
= zImage.epapr
else ifeq
($(BR2_
LINUX_
KERNEL_APPENDED_ZIMAGE
),y
)
LINUX_IMAGE_NAME
= zImage
else ifeq
($(BR2_
LINUX_
KERNEL_CUIMAGE
),y
)
LINUX_IMAGE_NAME
= cuImage.
$(KERNEL_DTS_NAME
)
else ifeq
($(BR2_
LINUX_
KERNEL_SIMPLEIMAGE
),y
)
LINUX_IMAGE_NAME
= simpleImage.
$(KERNEL_DTS_NAME
)
else ifeq
($(BR2_
LINUX_
KERNEL_IMAGE
),y
)
LINUX_IMAGE_NAME
= Image
else ifeq
($(BR2_
LINUX_
KERNEL_
LINUX_BIN
),y
)
LINUX_IMAGE_NAME
= linux.bin
else ifeq
($(BR2_
LINUX_
KERNEL_VM
LINUX_BIN
),y
)
LINUX_IMAGE_NAME
= vm
linux.bin
else ifeq
($(BR2_
LINUX_
KERNEL_VM
LINUX),y
)
LINUX_IMAGE_NAME
= vm
linux
else ifeq
($(BR2_
LINUX_
KERNEL_VMLINUZ
),y
)
LINUX_IMAGE_NAME
= vmlinuz
endif
# The if
-else blocks above are all the image types we know of, and all
# come from a Kconfig choice, so we know we have
LINUX_IMAGE_NAME set
# to something
LINUX_TARGET_NAME
= $(LINUX_IMAGE_NAME
)
endif
LINUX_
KERNEL_UIMAGE_LOADADDR
= $(call qstrip,
$(BR2_
LINUX_
KERNEL_UIMAGE_LOADADDR
))
ifneq
($(LINUX_
KERNEL_UIMAGE_LOADADDR
),
)
LINUX_
MAKE_FLAGS +
= LOADADDR
="
$(LINUX_
KERNEL_UIMAGE_LOADADDR
)"
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_VM
LINUX),y
)
LINUX_IMAGE_
PATH = $(LINUX_DIR
)/
$(LINUX_IMAGE_NAME
)
else ifeq
($(BR2_
LINUX_
KERNEL_VMLINUZ
),y
)
LINUX_IMAGE_
PATH = $(LINUX_DIR
)/
$(LINUX_IMAGE_NAME
)
else
LINUX_IMAGE_
PATH = $(KERNEL_ARCH_
PATH)/boot/
$(LINUX_IMAGE_NAME
)
endif # BR2_
LINUX_
KERNEL_VM
LINUX
define
LINUX_APPLY_LOCAL_PATCHES
for p in
$(filter
-out ftp://% http://% https://%,
$(LINUX_PATCHES
)) ; do \
if test
-d
$$p ; then \
$(APPLY_PATCHES
) $(@D
) $$p \*.patch || exit 1 ; \
else \
$(APPLY_PATCHES
) $(@D
) `dirname
$$p` `basename
$$p` || exit 1; \
fi \
done
endef
LINUX_POST_PATCH_HOOKS +
= LINUX_APPLY_LOCAL_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
= $(call qstrip,
$(BR2_
LINUX_
KERNEL_CUSTOM_CONFIG_FILE
))
endif
LINUX_KCONFIG_FILE
= $(KERNEL_SOURCE_CONFIG
)
LINUX_KCONFIG_FRAGMENT_FILES
= $(call qstrip,
$(BR2_
LINUX_
KERNEL_CONFIG_FRAGMENT_FILES
))
LINUX_KCONFIG_EDITORS
= menuconfig xconfig gconfig nconfig
LINUX_KCONFIG_OPTS
= $(LINUX_
MAKE_FLAGS
)
define
LINUX_KCONFIG_FIXUP_CMDS
$(if
$(LINUX_NEEDS_
MODULES),
$(call KCONFIG_ENABLE_OPT,CONFIG_
MODULES,
$(@D
)/.config
))
$(if
$(BR2_arm
)$(BR2_armeb
),
$(call KCONFIG_ENABLE_OPT,CONFIG_AEABI,
$(@D
)/.config
))
$(if
$(BR2_TARGET_ROOTFS_CPIO
),
$(call KCONFIG_ENABLE_OPT,CONFIG_BLK_DEV_INITRD,
$(@D
)/.config
))
# As the
kernel gets compiled before root filesystems are
# built, we create a fake cpio file. It'll be
# replaced later by the real cpio archive, and the
kernel will be
# rebuilt using the
linux-rebuild
-with
-initramfs target.
$(if
$(BR2_TARGET_ROOTFS_INITRAMFS
),
touch
$(BINARIES_DIR
)/rootfs.cpio
$(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_SOURCE,"
$${BR_BINARIES_DIR}/rootfs.cpio",
$(@D
)/.config
)
$(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_ROOT_UID,0,
$(@D
)/.config
)
$(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_ROOT_GID,0,
$(@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_EUDEV
),
$(call KCONFIG_ENABLE_OPT,CONFIG_INOTIFY_USER,
$(@D
)/.config
))
$(if
$(BR2_PACKAGE_KTAP
),
$(call KCONFIG_ENABLE_OPT,CONFIG_DEBUG_FS,
$(@D
)/.config
)
$(call KCONFIG_ENABLE_OPT,CONFIG_ENABLE_DEFAULT_TRACERS,
$(@D
)/.config
)
$(call KCONFIG_ENABLE_OPT,CONFIG_PERF_EVENTS,
$(@D
)/.config
)
$(call KCONFIG_ENABLE_OPT,CONFIG_FUNCTION_TRACER,
$(@D
)/.config
))
$(if
$(BR2_PACKAGE_SYSTEMD
),
$(call KCONFIG_ENABLE_OPT,CONFIG_CGROUPS,
$(@D
)/.config
)
$(call KCONFIG_ENABLE_OPT,CONFIG_INOTIFY_USER,
$(@D
)/.config
)
$(call KCONFIG_ENABLE_OPT,CONFIG_FHANDLE,
$(@D
)/.config
)
$(call KCONFIG_ENABLE_OPT,CONFIG_AUTOFS4_FS,
$(@D
)/.config
)
$(call KCONFIG_ENABLE_OPT,CONFIG_TMPFS_POSIX_ACL,
$(@D
)/.config
)
$(call KCONFIG_ENABLE_OPT,CONFIG_TMPFS_POSIX_XATTR,
$(@D
)/.config
))
$(if
$(BR2_PACKAGE_SMACK
),
$(call KCONFIG_ENABLE_OPT,CONFIG_SECURITY,
$(@D
)/.config
)
$(call KCONFIG_ENABLE_OPT,CONFIG_SECURITY_SMACK,
$(@D
)/.config
)
$(call KCONFIG_ENABLE_OPT,CONFIG_SECURITY_NETWORK,
$(@D
)/.config
))
$(if
$(BR2_PACKAGE_IPTABLES
),
$(call KCONFIG_ENABLE_OPT,CONFIG_IP_NF_IPTABLES,
$(@D
)/.config
)
$(call KCONFIG_ENABLE_OPT,CONFIG_IP_NF_FILTER,
$(@D
)/.config
)
$(call KCONFIG_ENABLE_OPT,CONFIG_NETFILTER,
$(@D
)/.config
)
$(call KCONFIG_ENABLE_OPT,CONFIG_NETFILTER_XTABLES,
$(@D
)/.config
))
$(if
$(BR2_PACKAGE_XTABLES_ADDONS
),
$(call KCONFIG_ENABLE_OPT,CONFIG_NETFILTER_ADVANCED,
$(@D
)/.config
)
$(call KCONFIG_ENABLE_OPT,CONFIG_NF_CONNTRACK,
$(@D
)/.config
)
$(call KCONFIG_ENABLE_OPT,CONFIG_NF_CONNTRACK_MARK,
$(@D
)/.config
))
$(if
$(BR2_
LINUX_
KERNEL_APPENDED_DTB
),
$(call KCONFIG_ENABLE_OPT,CONFIG_ARM_APPENDED_DTB,
$(@D
)/.config
))
endef
ifeq
($(BR2_
LINUX_
KERNEL_DTS_SUPPORT
),y
)
ifeq
($(BR2_
LINUX_
KERNEL_DTB_IS_SELF_BUILT
),
)
define
LINUX_BUILD_DTB
$(LINUX_
MAKE_ENV
) $(MAKE) $(LINUX_
MAKE_FLAGS
) -C
$(@D
) $(KERNEL_DTBS
)
endef
define
LINUX_INSTALL_DTB
# dtbs moved from arch/<ARCH>/boot to arch/<ARCH>/boot/dts since 3.8
-rc1
cp
$(addprefix \
$(KERNEL_ARCH_
PATH)/boot/
$(if
$(wildcard \
$(addprefix
$(KERNEL_ARCH_
PATH)/boot/dts/,
$(KERNEL_DTBS
))),dts/
),
$(KERNEL_DTBS
)) \
$(BINARIES_DIR
)/
endef
define
LINUX_INSTALL_DTB_TARGET
# dtbs moved from arch/<ARCH>/boot to arch/<ARCH>/boot/dts since 3.8
-rc1
cp
$(addprefix \
$(KERNEL_ARCH_
PATH)/boot/
$(if
$(wildcard \
$(addprefix
$(KERNEL_ARCH_
PATH)/boot/dts/,
$(KERNEL_DTBS
))),dts/
),
$(KERNEL_DTBS
)) \
$(TARGET_DIR
)/boot/
endef
endif
endif
ifeq
($(BR2_
LINUX_
KERNEL_APPENDED_DTB
),y
)
# dtbs moved from arch/
$ARCH/boot to arch/
$ARCH/boot/dts since 3.8
-rc1
define
LINUX_APPEND_DTB
if [
-e
$(KERNEL_ARCH_
PATH)/boot/
$(KERNEL_DTS_NAME
).dtb ]; then \
cat
$(KERNEL_ARCH_
PATH)/boot/
$(KERNEL_DTS_NAME
).dtb; \
else \
cat
$(KERNEL_ARCH_
PATH)/boot/dts/
$(KERNEL_DTS_NAME
).dtb; \
fi >>
$(KERNEL_ARCH_
PATH)/boot/zImage
endef
ifeq
($(BR2_
LINUX_
KERNEL_APPENDED_UIMAGE
),y
)
# We need to generate a new u
-boot image that takes into
# account the extra
-size added by the device tree at the end
# of the image. To do so, we first need to retrieve both load
# address and entry point for the
kernel from the already
# generate uboot image before using mkimage
-l.
LINUX_APPEND_DTB +
= $(sep
) MKIMAGE_ARGS
=`
$(MKIMAGE
) -l
$(LINUX_IMAGE_
PATH) |\
sed
-n
-e 's/Image Name:[ ]*\
(.*\
)/
-n \1/p'
-e 's/Load Address:/
-a/p'
-e 's/Entry Point:/
-e/p'`; \
$(MKIMAGE
) -A
$(MKIMAGE_ARCH
) -O
linux \
-T
kernel -C none
$${MKIMAGE_ARGS} \
-d
$(KERNEL_ARCH_
PATH)/boot/zImage
$(LINUX_IMAGE_
PATH);
endif
endif
# Compilation. We
make sure the
kernel gets rebuilt when the
# configuration has changed.
define
LINUX_BUILD_CMDS
$(if
$(BR2_
LINUX_
KERNEL_USE_CUSTOM_DTS
),
cp
$(call qstrip,
$(BR2_
LINUX_
KERNEL_CUSTOM_DTS_
PATH)) $(KERNEL_ARCH_
PATH)/boot/dts/
)
$(LINUX_
MAKE_ENV
) $(MAKE) $(LINUX_
MAKE_FLAGS
) -C
$(@D
) $(LINUX_TARGET_NAME
)
@if grep
-q "CONFIG_
MODULES=y"
$(@D
)/.config; then \
$(LINUX_
MAKE_ENV
) $(MAKE) $(LINUX_
MAKE_FLAGS
) -C
$(@D
) modules ; \
fi
$(LINUX_BUILD_DTB
)
$(LINUX_APPEND_DTB
)
endef
ifeq
($(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
)
$(LINUX_INSTALL_DTB_TARGET
)
endef
endif
define
LINUX_INSTALL_HOST_TOOLS
# Installing dtc
(device tree compiler
) as host tool, if selected
if grep
-q "CONFIG_DTC
=y"
$(@D
)/.config; then \
$(INSTALL
) -D
-m 0755
$(@D
)/scripts/dtc/dtc
$(HOST_DIR
)/usr/bin/
linux-dtc ; \
fi
endef
define
LINUX_INSTALL_IMAGES_CMDS
cp
$(LINUX_IMAGE_
PATH) $(BINARIES_DIR
)
$(LINUX_INSTALL_DTB
)
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 \
$(LINUX_
MAKE_ENV
) $(MAKE1
) $(LINUX_
MAKE_FLAGS
) -C
$(@D
) modules_install; \
rm
-f
$(TARGET_DIR
)/lib/
modules/
$(LINUX_VERSION_PROBED
)/build ; \
rm
-f
$(TARGET_DIR
)/lib/
modules/
$(LINUX_VERSION_PROBED
)/source ; \
fi
$(LINUX_INSTALL_HOST_TOOLS
)
endef
# Include all our extensions and tools definitions.
#
# Note: our package infrastructure uses the full
-path of the last
-scanned
#
Makefile to determine what package we're currently defining, using the
# last directory component in the
path. As such, including other
Makefile,
# like below, before we call one of the *
-package macro is usally not
# working.
# However, since the files we include here are in the same directory as
# the current
Makefile, we are OK. But this is a hard requirement: files
# included here *must* be in the same directory!
include
$(sort
$(wildcard
linux/
linux-ext
-*.mk
))
include
$(sort
$(wildcard
linux/
linux-tool
-*.mk
))
LINUX_PATCH_DEPENDENCIES +
= $(foreach ext,
$(LINUX_EXTENSIONS
),\
$(if
$(BR2_
LINUX_
KERNEL_EXT_
$(call UPPERCASE,
$(ext
))),
$(ext
)))
LINUX_PRE_PATCH_HOOKS +
= $(foreach ext,
$(LINUX_EXTENSIONS
),\
$(if
$(BR2_
LINUX_
KERNEL_EXT_
$(call UPPERCASE,
$(ext
))),\
$(call UPPERCASE,
$(ext
))_PREPARE_
KERNEL))
# Install
Linux kernel tools in the staging directory since some tools
# may install shared libraries and headers
(e.g. cpupower
). The
kernel
# image is NOT installed in the staging directory.
LINUX_INSTALL_STAGING
= YES
LINUX_DEPENDENCIES +
= $(foreach tool,
$(LINUX_TOOLS
),\
$(if
$(BR2_
LINUX_
KERNEL_TOOL_
$(call UPPERCASE,
$(tool
))),\
$($(call UPPERCASE,
$(tool
))_DEPENDENCIES
)))
LINUX_POST_BUILD_HOOKS +
= $(foreach tool,
$(LINUX_TOOLS
),\
$(if
$(BR2_
LINUX_
KERNEL_TOOL_
$(call UPPERCASE,
$(tool
))),\
$(call UPPERCASE,
$(tool
))_BUILD_CMDS
))
LINUX_POST_INSTALL_STAGING_HOOKS +
= $(foreach tool,
$(LINUX_TOOLS
),\
$(if
$(BR2_
LINUX_
KERNEL_TOOL_
$(call UPPERCASE,
$(tool
))),\
$(call UPPERCASE,
$(tool
))_INSTALL_STAGING_CMDS
))
LINUX_POST_INSTALL_TARGET_HOOKS +
= $(foreach tool,
$(LINUX_TOOLS
),\
$(if
$(BR2_
LINUX_
KERNEL_TOOL_
$(call UPPERCASE,
$(tool
))),\
$(call UPPERCASE,
$(tool
))_INSTALL_TARGET_CMDS
))
# Checks to give errors that the user can understand
ifeq
($(BR_BUILDING
),y
)
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
)),
)
$(error No
kernel configuration file specified, check your BR2_
LINUX_
KERNEL_CUSTOM_CONFIG_FILE setting
)
endif
endif
ifeq
($(BR2_
LINUX_
KERNEL_DTS_SUPPORT
)$(KERNEL_DTS_NAME
),y
)
$(error No
kernel device tree source specified, check your \
BR2_
LINUX_
KERNEL_USE_INTREE_DTS / BR2_
LINUX_
KERNEL_USE_CUSTOM_DTS settings
)
endif
ifeq
($(BR2_
LINUX_
KERNEL_APPENDED_DTB
),y
)
ifneq
($(words
$(KERNEL_DTS_NAME
)),1
)
$(error
Kernel with appended device tree needs exactly one DTS source. \
Check BR2_
LINUX_
KERNEL_INTREE_DTS_NAME or BR2_
LINUX_
KERNEL_CUSTOM_DTS_
PATH.
)
endif
endif
endif # BR_BUILDING
$(eval
$(kconfig
-package
))
# Support for rebuilding the
kernel after the cpio archive has
# been generated in
$(BINARIES_DIR
)/rootfs.cpio.
$(LINUX_DIR
)/.stamp_initramfs_rebuilt:
$(LINUX_DIR
)/.stamp_target_installed
$(LINUX_DIR
)/.stamp_images_installed
$(BINARIES_DIR
)/rootfs.cpio
@
$(call MESSAGE,"Rebuilding
kernel with initramfs"
)
# Build the
kernel.
$(LINUX_
MAKE_ENV
) $(MAKE) $(LINUX_
MAKE_FLAGS
) -C
$(@D
) $(LINUX_TARGET_NAME
)
$(LINUX_APPEND_DTB
)
# Copy the
kernel image to its final destination
cp
$(LINUX_IMAGE_
PATH) $(BINARIES_DIR
)
# If there is a .ub file copy it to the final destination
test !
-f
$(LINUX_IMAGE_
PATH).ub || cp
$(LINUX_IMAGE_
PATH).ub
$(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:
$(LINUX_DIR
)/.stamp_initramfs_rebuilt
本文详细介绍了在Linux 2.6内核环境下模块编译的过程及Makefile配置方法，重点解释了make命令中的M选项作用，并对比了新旧编译方式的不同。
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