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Makefile中的特殊变量，包括它们的作用、用途和常见应用实例，旨在帮助开发者更高效地编写Makefile。
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