linux/linux.mk

   1 ################################################################################
   2 #
   3 # Linux kernel target
   4 #
   5 ################################################################################
   6
   7 LINUX_VERSION = $(call qstrip,$(BR2_LINUX_KERNEL_VERSION))
   8 LINUX_LICENSE = GPLv2
   9 LINUX_LICENSE_FILES = COPYING
  10
  11 # Compute LINUX_SOURCE and LINUX_SITE from the configuration
  12 ifeq ($(BR2_LINUX_KERNEL_CUSTOM_TARBALL),y)
  13 LINUX_TARBALL = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_TARBALL_LOCATION))
  14 LINUX_SITE = $(patsubst %/,%,$(dir $(LINUX_TARBALL)))
  15 LINUX_SOURCE = $(notdir $(LINUX_TARBALL))
  16 BR_NO_CHECK_HASH_FOR += $(LINUX_SOURCE)
  17 else ifeq ($(BR2_LINUX_KERNEL_CUSTOM_LOCAL),y)
  18 LINUX_SITE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_LOCAL_PATH))
  19 LINUX_SITE_METHOD = local
  20 else ifeq ($(BR2_LINUX_KERNEL_CUSTOM_GIT),y)
  21 LINUX_SITE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_URL))
  22 LINUX_SITE_METHOD = git
  23 else ifeq ($(BR2_LINUX_KERNEL_CUSTOM_HG),y)
  24 LINUX_SITE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_URL))
  25 LINUX_SITE_METHOD = hg
  26 else
  27 LINUX_SOURCE = linux-$(LINUX_VERSION).tar.xz
  28 ifeq ($(BR2_LINUX_KERNEL_CUSTOM_VERSION),y)
  29 BR_NO_CHECK_HASH_FOR += $(LINUX_SOURCE)
  30 endif
  31 ifeq ($(BR2_LINUX_KERNEL_SAME_AS_HEADERS)$(BR2_KERNEL_HEADERS_VERSION),yy)
  32 BR_NO_CHECK_HASH_FOR += $(LINUX_SOURCE)
  33 endif
  34 # In X.Y.Z, get X and Y. We replace dots and dashes by spaces in order
  35 # to use the $(word) function. We support versions such as 4.0, 3.1,
  36 # 2.6.32, 2.6.32-rc1, 3.0-rc6, etc.
  37 ifeq ($(findstring x2.6.,x$(LINUX_VERSION)),x2.6.)
  38 LINUX_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v2.6
  39 else ifeq ($(findstring x3.,x$(LINUX_VERSION)),x3.)
  40 LINUX_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v3.x
  41 else ifeq ($(findstring x4.,x$(LINUX_VERSION)),x4.)
  42 LINUX_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v4.x
  43 endif
  44 # release candidates are in testing/ subdir
  45 ifneq ($(findstring -rc,$(LINUX_VERSION)),)
  46 LINUX_SITE := $(LINUX_SITE)/testing
  47 endif # -rc
  48 endif
  49
  50 LINUX_PATCHES = $(call qstrip,$(BR2_LINUX_KERNEL_PATCH))
  51
  52 # We rely on the generic package infrastructure to download and apply
  53 # remote patches (downloaded from ftp, http or https). For local
  54 # patches, we can't rely on that infrastructure, because there might
  55 # be directories in the patch list (unlike for other packages).
  56 LINUX_PATCH = $(filter ftp://% http://% https://%,$(LINUX_PATCHES))
  57
  58 LINUX_INSTALL_IMAGES = YES
  59 LINUX_DEPENDENCIES += host-kmod host-lzop
  60
  61 ifeq ($(BR2_LINUX_KERNEL_UBOOT_IMAGE),y)
  62 LINUX_DEPENDENCIES += host-uboot-tools
  63 endif
  64
  65 LINUX_MAKE_FLAGS = \
  66         HOSTCC="$(HOSTCC)" \
  67         HOSTCFLAGS="$(HOSTCFLAGS)" \
  68         ARCH=$(KERNEL_ARCH) \
  69         INSTALL_MOD_PATH=$(TARGET_DIR) \
  70         CROSS_COMPILE="$(CCACHE) $(TARGET_CROSS)" \
  71         DEPMOD=$(HOST_DIR)/sbin/depmod
  72
  73 LINUX_MAKE_ENV = \
  74         $(TARGET_MAKE_ENV) \
  75         BR_BINARIES_DIR=$(BINARIES_DIR)
  76
  77 # Get the real Linux version, which tells us where kernel modules are
  78 # going to be installed in the target filesystem.
  79 LINUX_VERSION_PROBED = $(shell $(MAKE) $(LINUX_MAKE_FLAGS) -C $(LINUX_DIR) --no-print-directory -s kernelrelease)
  80
  81 ifeq ($(BR2_LINUX_KERNEL_USE_INTREE_DTS),y)
  82 KERNEL_DTS_NAME = $(call qstrip,$(BR2_LINUX_KERNEL_INTREE_DTS_NAME))
  83 else ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_DTS),y)
  84 # We keep only the .dts files, so that the user can specify both .dts
  85 # and .dtsi files in BR2_LINUX_KERNEL_CUSTOM_DTS_PATH. Both will be
  86 # copied to arch/<arch>/boot/dts, but only the .dts files will
  87 # actually be generated as .dtb.
  88 KERNEL_DTS_NAME = $(basename $(filter %.dts,$(notdir $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_DTS_PATH)))))
  89 endif
  90
  91 ifeq ($(BR2_LINUX_KERNEL_DTS_SUPPORT)$(KERNEL_DTS_NAME),y)
  92 $(error No kernel device tree source specified, check your \
  93 BR2_LINUX_KERNEL_USE_INTREE_DTS / BR2_LINUX_KERNEL_USE_CUSTOM_DTS settings)
  94 endif
  95
  96 ifeq ($(BR2_LINUX_KERNEL_APPENDED_DTB),y)
  97 ifneq ($(words $(KERNEL_DTS_NAME)),1)
  98 $(error Kernel with appended device tree needs exactly one DTS source. \
  99         Check BR2_LINUX_KERNEL_INTREE_DTS_NAME or BR2_LINUX_KERNEL_CUSTOM_DTS_PATH.)
 100 endif
 101 endif
 102
 103 KERNEL_DTBS = $(addsuffix .dtb,$(KERNEL_DTS_NAME))
 104
 105 ifeq ($(BR2_LINUX_KERNEL_IMAGE_TARGET_CUSTOM),y)
 106 LINUX_IMAGE_NAME = $(call qstrip,$(BR2_LINUX_KERNEL_IMAGE_NAME))
 107 LINUX_TARGET_NAME = $(call qstrip,$(BR2_LINUX_KERNEL_IMAGE_TARGET_NAME))
 108 ifeq ($(LINUX_IMAGE_NAME),)
 109 LINUX_IMAGE_NAME = $(LINUX_TARGET_NAME)
 110 endif
 111 else
 112 ifeq ($(BR2_LINUX_KERNEL_UIMAGE),y)
 113 LINUX_IMAGE_NAME = uImage
 114 else ifeq ($(BR2_LINUX_KERNEL_APPENDED_UIMAGE),y)
 115 LINUX_IMAGE_NAME = uImage
 116 else ifeq ($(BR2_LINUX_KERNEL_BZIMAGE),y)
 117 LINUX_IMAGE_NAME = bzImage
 118 else ifeq ($(BR2_LINUX_KERNEL_ZIMAGE),y)
 119 LINUX_IMAGE_NAME = zImage
 120 else ifeq ($(BR2_LINUX_KERNEL_APPENDED_ZIMAGE),y)
 121 LINUX_IMAGE_NAME = zImage
 122 else ifeq ($(BR2_LINUX_KERNEL_CUIMAGE),y)
 123 LINUX_IMAGE_NAME = cuImage.$(KERNEL_DTS_NAME)
 124 else ifeq ($(BR2_LINUX_KERNEL_SIMPLEIMAGE),y)
 125 LINUX_IMAGE_NAME = simpleImage.$(KERNEL_DTS_NAME)
 126 else ifeq ($(BR2_LINUX_KERNEL_LINUX_BIN),y)
 127 LINUX_IMAGE_NAME = linux.bin
 128 else ifeq ($(BR2_LINUX_KERNEL_VMLINUX_BIN),y)
 129 LINUX_IMAGE_NAME = vmlinux.bin
 130 else ifeq ($(BR2_LINUX_KERNEL_VMLINUX),y)
 131 LINUX_IMAGE_NAME = vmlinux
 132 else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ),y)
 133 LINUX_IMAGE_NAME = vmlinuz
 134 endif
 135 # The if-else blocks above are all the image types we know of, and all
 136 # come from a Kconfig choice, so we know we have LINUX_IMAGE_NAME set
 137 # to something
 138 LINUX_TARGET_NAME = $(LINUX_IMAGE_NAME)
 139 endif
 140
 141 LINUX_KERNEL_UIMAGE_LOADADDR = $(call qstrip,$(BR2_LINUX_KERNEL_UIMAGE_LOADADDR))
 142 ifneq ($(LINUX_KERNEL_UIMAGE_LOADADDR),)
 143 LINUX_MAKE_FLAGS += LOADADDR="$(LINUX_KERNEL_UIMAGE_LOADADDR)"
 144 endif
 145
 146 # Compute the arch path, since i386 and x86_64 are in arch/x86 and not
 147 # in arch/$(KERNEL_ARCH). Even if the kernel creates symbolic links
 148 # for bzImage, arch/i386 and arch/x86_64 do not exist when copying the
 149 # defconfig file.
 150 ifeq ($(KERNEL_ARCH),i386)
 151 KERNEL_ARCH_PATH = $(LINUX_DIR)/arch/x86
 152 else ifeq ($(KERNEL_ARCH),x86_64)
 153 KERNEL_ARCH_PATH = $(LINUX_DIR)/arch/x86
 154 else
 155 KERNEL_ARCH_PATH = $(LINUX_DIR)/arch/$(KERNEL_ARCH)
 156 endif
 157
 158 ifeq ($(BR2_LINUX_KERNEL_VMLINUX),y)
 159 LINUX_IMAGE_PATH = $(LINUX_DIR)/$(LINUX_IMAGE_NAME)
 160 else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ),y)
 161 LINUX_IMAGE_PATH = $(LINUX_DIR)/$(LINUX_IMAGE_NAME)
 162 else
 163 LINUX_IMAGE_PATH = $(KERNEL_ARCH_PATH)/boot/$(LINUX_IMAGE_NAME)
 164 endif # BR2_LINUX_KERNEL_VMLINUX
 165
 166 define LINUX_APPLY_LOCAL_PATCHES
 167         for p in $(filter-out ftp://% http://% https://%,$(LINUX_PATCHES)) ; do \
 168                 if test -d $$p ; then \
 169                         $(APPLY_PATCHES) $(@D) $$p \*.patch || exit 1 ; \
 170                 else \
 171                         $(APPLY_PATCHES) $(@D) `dirname $$p` `basename $$p` || exit 1; \
 172                 fi \
 173         done
 174 endef
 175
 176 LINUX_POST_PATCH_HOOKS += LINUX_APPLY_LOCAL_PATCHES
 177
 178 ifeq ($(BR2_LINUX_KERNEL_USE_DEFCONFIG),y)
 179 KERNEL_SOURCE_CONFIG = $(KERNEL_ARCH_PATH)/configs/$(call qstrip,$(BR2_LINUX_KERNEL_DEFCONFIG))_defconfig
 180 else ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG),y)
 181 KERNEL_SOURCE_CONFIG = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE))
 182 endif
 183
 184 LINUX_KCONFIG_FILE = $(KERNEL_SOURCE_CONFIG)
 185 LINUX_KCONFIG_FRAGMENT_FILES = $(call qstrip,$(BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES))
 186 LINUX_KCONFIG_EDITORS = menuconfig xconfig gconfig nconfig
 187 LINUX_KCONFIG_OPTS = $(LINUX_MAKE_FLAGS)
 188
 189 define LINUX_KCONFIG_FIXUP_CMDS
 190         $(if $(BR2_arm)$(BR2_armeb),
 191                 $(call KCONFIG_ENABLE_OPT,CONFIG_AEABI,$(@D)/.config))
 192         $(if $(BR2_TARGET_ROOTFS_CPIO),
 193                 $(call KCONFIG_ENABLE_OPT,CONFIG_BLK_DEV_INITRD,$(@D)/.config))
 194         # As the kernel gets compiled before root filesystems are
 195         # built, we create a fake cpio file. It'll be
 196         # replaced later by the real cpio archive, and the kernel will be
 197         # rebuilt using the linux-rebuild-with-initramfs target.
 198         $(if $(BR2_TARGET_ROOTFS_INITRAMFS),
 199                 touch $(BINARIES_DIR)/rootfs.cpio
 200                 $(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_SOURCE,"$${BR_BINARIES_DIR}/rootfs.cpio",$(@D)/.config)
 201                 $(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_ROOT_UID,0,$(@D)/.config)
 202                 $(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_ROOT_GID,0,$(@D)/.config))
 203         $(if $(BR2_ROOTFS_DEVICE_CREATION_STATIC),,
 204                 $(call KCONFIG_ENABLE_OPT,CONFIG_DEVTMPFS,$(@D)/.config)
 205                 $(call KCONFIG_ENABLE_OPT,CONFIG_DEVTMPFS_MOUNT,$(@D)/.config))
 206         $(if $(BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_EUDEV),
 207                 $(call KCONFIG_ENABLE_OPT,CONFIG_INOTIFY_USER,$(@D)/.config))
 208         $(if $(BR2_PACKAGE_KTAP),
 209                 $(call KCONFIG_ENABLE_OPT,CONFIG_DEBUG_FS,$(@D)/.config)
 210                 $(call KCONFIG_ENABLE_OPT,CONFIG_EVENT_TRACING,$(@D)/.config)
 211                 $(call KCONFIG_ENABLE_OPT,CONFIG_PERF_EVENTS,$(@D)/.config)
 212                 $(call KCONFIG_ENABLE_OPT,CONFIG_FUNCTION_TRACER,$(@D)/.config))
 213         $(if $(BR2_PACKAGE_SYSTEMD),
 214                 $(call KCONFIG_ENABLE_OPT,CONFIG_CGROUPS,$(@D)/.config)
 215                 $(call KCONFIG_ENABLE_OPT,CONFIG_INOTIFY_USER,$(@D)/.config)
 216                 $(call KCONFIG_ENABLE_OPT,CONFIG_FHANDLE,$(@D)/.config)
 217                 $(call KCONFIG_ENABLE_OPT,CONFIG_AUTOFS4_FS,$(@D)/.config)
 218                 $(call KCONFIG_ENABLE_OPT,CONFIG_TMPFS_POSIX_ACL,$(@D)/.config)
 219                 $(call KCONFIG_ENABLE_OPT,CONFIG_TMPFS_POSIX_XATTR,$(@D)/.config))
 220         $(if $(BR2_PACKAGE_SMACK),
 221                 $(call KCONFIG_ENABLE_OPT,CONFIG_SECURITY,$(@D)/.config)
 222                 $(call KCONFIG_ENABLE_OPT,CONFIG_SECURITY_SMACK,$(@D)/.config)
 223                 $(call KCONFIG_ENABLE_OPT,CONFIG_SECURITY_NETWORK,$(@D)/.config))
 224         $(if $(BR2_PACKAGE_IPTABLES),
 225                 $(call KCONFIG_ENABLE_OPT,CONFIG_IP_NF_IPTABLES,$(@D)/.config)
 226                 $(call KCONFIG_ENABLE_OPT,CONFIG_IP_NF_FILTER,$(@D)/.config)
 227                 $(call KCONFIG_ENABLE_OPT,CONFIG_NETFILTER,$(@D)/.config)
 228                 $(call KCONFIG_ENABLE_OPT,CONFIG_NETFILTER_XTABLES,$(@D)/.config))
 229         $(if $(BR2_PACKAGE_XTABLES_ADDONS),
 230                 $(call KCONFIG_ENABLE_OPT,CONFIG_NF_CONNTRACK,$(@D)/.config)
 231                 $(call KCONFIG_ENABLE_OPT,CONFIG_NF_CONNTRACK_MARK,$(@D)/.config))
 232         $(if $(BR2_LINUX_KERNEL_APPENDED_DTB),
 233                 $(call KCONFIG_ENABLE_OPT,CONFIG_ARM_APPENDED_DTB,$(@D)/.config))
 234 endef
 235
 236 ifeq ($(BR2_LINUX_KERNEL_DTS_SUPPORT),y)
 237 ifeq ($(BR2_LINUX_KERNEL_DTB_IS_SELF_BUILT),)
 238 define LINUX_BUILD_DTB
 239         $(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(KERNEL_DTBS)
 240 endef
 241 define LINUX_INSTALL_DTB
 242         # dtbs moved from arch/<ARCH>/boot to arch/<ARCH>/boot/dts since 3.8-rc1
 243         cp $(addprefix \
 244                 $(KERNEL_ARCH_PATH)/boot/$(if $(wildcard \
 245                 $(addprefix $(KERNEL_ARCH_PATH)/boot/dts/,$(KERNEL_DTBS))),dts/),$(KERNEL_DTBS)) \
 246                 $(BINARIES_DIR)/
 247 endef
 248 define LINUX_INSTALL_DTB_TARGET
 249         # dtbs moved from arch/<ARCH>/boot to arch/<ARCH>/boot/dts since 3.8-rc1
 250         cp $(addprefix \
 251                 $(KERNEL_ARCH_PATH)/boot/$(if $(wildcard \
 252                 $(addprefix $(KERNEL_ARCH_PATH)/boot/dts/,$(KERNEL_DTBS))),dts/),$(KERNEL_DTBS)) \
 253                 $(TARGET_DIR)/boot/
 254 endef
 255 endif
 256 endif
 257
 258 ifeq ($(BR2_LINUX_KERNEL_APPENDED_DTB),y)
 259 # dtbs moved from arch/$ARCH/boot to arch/$ARCH/boot/dts since 3.8-rc1
 260 define LINUX_APPEND_DTB
 261         if [ -e $(KERNEL_ARCH_PATH)/boot/$(KERNEL_DTS_NAME).dtb ]; then \
 262                 cat $(KERNEL_ARCH_PATH)/boot/$(KERNEL_DTS_NAME).dtb; \
 263         else \
 264                 cat $(KERNEL_ARCH_PATH)/boot/dts/$(KERNEL_DTS_NAME).dtb; \
 265         fi >> $(KERNEL_ARCH_PATH)/boot/zImage
 266 endef
 267 ifeq ($(BR2_LINUX_KERNEL_APPENDED_UIMAGE),y)
 268 # We need to generate a new u-boot image that takes into
 269 # account the extra-size added by the device tree at the end
 270 # of the image. To do so, we first need to retrieve both load
 271 # address and entry point for the kernel from the already
 272 # generate uboot image before using mkimage -l.
 273 LINUX_APPEND_DTB += $(sep) MKIMAGE_ARGS=`$(MKIMAGE) -l $(LINUX_IMAGE_PATH) |\
 274         sed -n -e 's/Image Name:[ ]*\(.*\)/-n \1/p' -e 's/Load Address:/-a/p' -e 's/Entry Point:/-e/p'`; \
 275         $(MKIMAGE) -A $(MKIMAGE_ARCH) -O linux \
 276         -T kernel -C none $${MKIMAGE_ARGS} \
 277         -d $(KERNEL_ARCH_PATH)/boot/zImage $(LINUX_IMAGE_PATH);
 278 endif
 279 endif
 280
 281 # Compilation. We make sure the kernel gets rebuilt when the
 282 # configuration has changed.
 283 define LINUX_BUILD_CMDS
 284         $(if $(BR2_LINUX_KERNEL_USE_CUSTOM_DTS),
 285                 cp $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_DTS_PATH)) $(KERNEL_ARCH_PATH)/boot/dts/)
 286         $(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(LINUX_TARGET_NAME)
 287         @if grep -q "CONFIG_MODULES=y" $(@D)/.config; then      \
 288                 $(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) modules ;        \
 289         fi
 290         $(LINUX_BUILD_DTB)
 291         $(LINUX_APPEND_DTB)
 292 endef
 293
 294
 295 ifeq ($(BR2_LINUX_KERNEL_INSTALL_TARGET),y)
 296 define LINUX_INSTALL_KERNEL_IMAGE_TO_TARGET
 297         install -m 0644 -D $(LINUX_IMAGE_PATH) $(TARGET_DIR)/boot/$(LINUX_IMAGE_NAME)
 298         $(LINUX_INSTALL_DTB_TARGET)
 299 endef
 300 endif
 301
 302
 303 define LINUX_INSTALL_HOST_TOOLS
 304         # Installing dtc (device tree compiler) as host tool, if selected
 305         if grep -q "CONFIG_DTC=y" $(@D)/.config; then   \
 306                 $(INSTALL) -D -m 0755 $(@D)/scripts/dtc/dtc $(HOST_DIR)/usr/bin/dtc ;   \
 307         fi
 308 endef
 309
 310
 311 define LINUX_INSTALL_IMAGES_CMDS
 312         cp $(LINUX_IMAGE_PATH) $(BINARIES_DIR)
 313         $(LINUX_INSTALL_DTB)
 314 endef
 315
 316 define LINUX_INSTALL_TARGET_CMDS
 317         $(LINUX_INSTALL_KERNEL_IMAGE_TO_TARGET)
 318         # Install modules and remove symbolic links pointing to build
 319         # directories, not relevant on the target
 320         @if grep -q "CONFIG_MODULES=y" $(@D)/.config; then      \
 321                 $(LINUX_MAKE_ENV) $(MAKE1) $(LINUX_MAKE_FLAGS) -C $(@D) modules_install; \
 322                 rm -f $(TARGET_DIR)/lib/modules/$(LINUX_VERSION_PROBED)/build ;         \
 323                 rm -f $(TARGET_DIR)/lib/modules/$(LINUX_VERSION_PROBED)/source ;        \
 324         fi
 325         $(LINUX_INSTALL_HOST_TOOLS)
 326 endef
 327
 328 # Note: our package infrastructure uses the full-path of the last-scanned
 329 # Makefile to determine what package we're currently defining, using the
 330 # last directory component in the path. As such, including other Makefile,
 331 # like below, before we call one of the *-package macro is usally not
 332 # working.
 333 # However, since the files we include here are in the same directory as
 334 # the current Makefile, we are OK. But this is a hard requirement: files
 335 # included here *must* be in the same directory!
 336 include $(sort $(wildcard linux/linux-ext-*.mk))
 337
 338 LINUX_PATCH_DEPENDENCIES += $(foreach ext,$(LINUX_EXTENSIONS),\
 339         $(if $(BR2_LINUX_KERNEL_EXT_$(call UPPERCASE,$(ext))),$(ext)))
 340
 341 LINUX_PRE_PATCH_HOOKS += $(foreach ext,$(LINUX_EXTENSIONS),\
 342         $(if $(BR2_LINUX_KERNEL_EXT_$(call UPPERCASE,$(ext))),\
 343                 $(call UPPERCASE,$(ext))_PREPARE_KERNEL))
 344
 345 $(eval $(kconfig-package))
 346
 347 # Support for rebuilding the kernel after the cpio archive has
 348 # been generated in $(BINARIES_DIR)/rootfs.cpio.
 349 $(LINUX_DIR)/.stamp_initramfs_rebuilt: $(LINUX_DIR)/.stamp_target_installed $(LINUX_DIR)/.stamp_images_installed $(BINARIES_DIR)/rootfs.cpio
 350         @$(call MESSAGE,"Rebuilding kernel with initramfs")
 351         # Build the kernel.
 352         $(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(LINUX_TARGET_NAME)
 353         $(LINUX_APPEND_DTB)
 354         # Copy the kernel image to its final destination
 355         cp $(LINUX_IMAGE_PATH) $(BINARIES_DIR)
 356         # If there is a .ub file copy it to the final destination
 357         test ! -f $(LINUX_IMAGE_PATH).ub || cp $(LINUX_IMAGE_PATH).ub $(BINARIES_DIR)
 358         $(Q)touch $@
 359
 360 # The initramfs building code must make sure this target gets called
 361 # after it generated the initramfs list of files.
 362 linux-rebuild-with-initramfs: $(LINUX_DIR)/.stamp_initramfs_rebuilt
 363
 364 # Checks to give errors that the user can understand
 365 ifeq ($(BR_BUILDING),y)
 366 ifeq ($(BR2_LINUX_KERNEL_USE_DEFCONFIG),y)
 367 ifeq ($(call qstrip,$(BR2_LINUX_KERNEL_DEFCONFIG)),)
 368 $(error No kernel defconfig name specified, check your BR2_LINUX_KERNEL_DEFCONFIG setting)
 369 endif
 370 endif
 371
 372 ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG),y)
 373 ifeq ($(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE)),)
 374 $(error No kernel configuration file specified, check your BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE setting)
 375 endif
 376 endif
 377
 378 endif