linux/linux.mk

   1 ################################################################################
   2 #
   3 # Linux kernel target
   4 #
   5 ################################################################################
   6
   7 LINUX_VERSION = $(call qstrip,$(BR2_LINUX_KERNEL_VERSION))
   8 LINUX_LICENSE = GPL-2.0
   9 LINUX_LICENSE_FILES = COPYING
  10
  11 define LINUX_HELP_CMDS
  12         @echo '  linux-menuconfig       - Run Linux kernel menuconfig'
  13         @echo '  linux-savedefconfig    - Run Linux kernel savedefconfig'
  14         @echo '  linux-update-defconfig - Save the Linux configuration to the path specified'
  15         @echo '                             by BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE'
  16 endef
  17
  18 # Compute LINUX_SOURCE and LINUX_SITE from the configuration
  19 ifeq ($(BR2_LINUX_KERNEL_CUSTOM_TARBALL),y)
  20 LINUX_TARBALL = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_TARBALL_LOCATION))
  21 LINUX_SITE = $(patsubst %/,%,$(dir $(LINUX_TARBALL)))
  22 LINUX_SOURCE = $(notdir $(LINUX_TARBALL))
  23 BR_NO_CHECK_HASH_FOR += $(LINUX_SOURCE)
  24 else ifeq ($(BR2_LINUX_KERNEL_CUSTOM_GIT),y)
  25 LINUX_SITE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_URL))
  26 LINUX_SITE_METHOD = git
  27 else ifeq ($(BR2_LINUX_KERNEL_CUSTOM_HG),y)
  28 LINUX_SITE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_URL))
  29 LINUX_SITE_METHOD = hg
  30 else ifeq ($(BR2_LINUX_KERNEL_CUSTOM_SVN),y)
  31 LINUX_SITE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_URL))
  32 LINUX_SITE_METHOD = svn
  33 else ifeq ($(BR2_LINUX_KERNEL_LATEST_CIP_VERSION),y)
  34 LINUX_SITE = git://git.kernel.org/pub/scm/linux/kernel/git/bwh/linux-cip.git
  35 else
  36 LINUX_SOURCE = linux-$(LINUX_VERSION).tar.xz
  37 ifeq ($(BR2_LINUX_KERNEL_CUSTOM_VERSION),y)
  38 BR_NO_CHECK_HASH_FOR += $(LINUX_SOURCE)
  39 endif
  40 # In X.Y.Z, get X and Y. We replace dots and dashes by spaces in order
  41 # to use the $(word) function. We support versions such as 4.0, 3.1,
  42 # 2.6.32, 2.6.32-rc1, 3.0-rc6, etc.
  43 ifeq ($(findstring x2.6.,x$(LINUX_VERSION)),x2.6.)
  44 LINUX_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v2.6
  45 else ifeq ($(findstring x3.,x$(LINUX_VERSION)),x3.)
  46 LINUX_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v3.x
  47 else ifeq ($(findstring x4.,x$(LINUX_VERSION)),x4.)
  48 LINUX_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v4.x
  49 endif
  50 # release candidates are in testing/ subdir
  51 ifneq ($(findstring -rc,$(LINUX_VERSION)),)
  52 LINUX_SITE := $(LINUX_SITE)/testing
  53 endif # -rc
  54 endif
  55
  56 LINUX_PATCHES = $(call qstrip,$(BR2_LINUX_KERNEL_PATCH))
  57
  58 # We rely on the generic package infrastructure to download and apply
  59 # remote patches (downloaded from ftp, http or https). For local
  60 # patches, we can't rely on that infrastructure, because there might
  61 # be directories in the patch list (unlike for other packages).
  62 LINUX_PATCH = $(filter ftp://% http://% https://%,$(LINUX_PATCHES))
  63
  64 LINUX_INSTALL_IMAGES = YES
  65 LINUX_DEPENDENCIES += host-kmod
  66
  67 # host tools needed for kernel compression
  68 ifeq ($(BR2_LINUX_KERNEL_LZ4),y)
  69 LINUX_DEPENDENCIES += host-lz4
  70 else ifeq ($(BR2_LINUX_KERNEL_LZMA),y)
  71 LINUX_DEPENDENCIES += host-lzma
  72 else ifeq ($(BR2_LINUX_KERNEL_LZO),y)
  73 LINUX_DEPENDENCIES += host-lzop
  74 else ifeq ($(BR2_LINUX_KERNEL_XZ),y)
  75 LINUX_DEPENDENCIES += host-xz
  76 endif
  77 LINUX_COMPRESSION_OPT_$(BR2_LINUX_KERNEL_GZIP) = CONFIG_KERNEL_GZIP
  78 LINUX_COMPRESSION_OPT_$(BR2_LINUX_KERNEL_LZ4) = CONFIG_KERNEL_LZ4
  79 LINUX_COMPRESSION_OPT_$(BR2_LINUX_KERNEL_LZMA) = CONFIG_KERNEL_LZMA
  80 LINUX_COMPRESSION_OPT_$(BR2_LINUX_KERNEL_LZO) = CONFIG_KERNEL_LZO
  81 LINUX_COMPRESSION_OPT_$(BR2_LINUX_KERNEL_XZ) = CONFIG_KERNEL_XZ
  82
  83 ifeq ($(BR2_LINUX_KERNEL_UBOOT_IMAGE),y)
  84 LINUX_DEPENDENCIES += host-uboot-tools
  85 endif
  86
  87 LINUX_MAKE_FLAGS = \
  88         HOSTCC="$(HOSTCC)" \
  89         HOSTCFLAGS="$(HOSTCFLAGS)" \
  90         ARCH=$(KERNEL_ARCH) \
  91         INSTALL_MOD_PATH=$(TARGET_DIR) \
  92         CROSS_COMPILE="$(TARGET_CROSS)" \
  93         DEPMOD=$(HOST_DIR)/sbin/depmod
  94
  95 LINUX_MAKE_ENV = \
  96         $(TARGET_MAKE_ENV) \
  97         BR_BINARIES_DIR=$(BINARIES_DIR)
  98
  99 ifeq ($(BR2_REPRODUCIBLE),y)
 100 LINUX_MAKE_ENV += \
 101         KBUILD_BUILD_VERSION=1 \
 102         KBUILD_BUILD_USER=buildroot \
 103         KBUILD_BUILD_HOST=buildroot \
 104         KBUILD_BUILD_TIMESTAMP="$(shell LC_ALL=C date -d @$(SOURCE_DATE_EPOCH))"
 105 endif
 106
 107 # Get the real Linux version, which tells us where kernel modules are
 108 # going to be installed in the target filesystem.
 109 LINUX_VERSION_PROBED = `$(MAKE) $(LINUX_MAKE_FLAGS) -C $(LINUX_DIR) --no-print-directory -s kernelrelease 2>/dev/null`
 110
 111 ifeq ($(BR2_LINUX_KERNEL_USE_INTREE_DTS),y)
 112 KERNEL_DTS_NAME = $(call qstrip,$(BR2_LINUX_KERNEL_INTREE_DTS_NAME))
 113 else ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_DTS),y)
 114 # We keep only the .dts files, so that the user can specify both .dts
 115 # and .dtsi files in BR2_LINUX_KERNEL_CUSTOM_DTS_PATH. Both will be
 116 # copied to arch/<arch>/boot/dts, but only the .dts files will
 117 # actually be generated as .dtb.
 118 KERNEL_DTS_NAME = $(basename $(filter %.dts,$(notdir $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_DTS_PATH)))))
 119 endif
 120
 121 KERNEL_DTBS = $(addsuffix .dtb,$(KERNEL_DTS_NAME))
 122
 123 ifeq ($(BR2_LINUX_KERNEL_IMAGE_TARGET_CUSTOM),y)
 124 LINUX_IMAGE_NAME = $(call qstrip,$(BR2_LINUX_KERNEL_IMAGE_NAME))
 125 LINUX_TARGET_NAME = $(call qstrip,$(BR2_LINUX_KERNEL_IMAGE_TARGET_NAME))
 126 ifeq ($(LINUX_IMAGE_NAME),)
 127 LINUX_IMAGE_NAME = $(LINUX_TARGET_NAME)
 128 endif
 129 else
 130 ifeq ($(BR2_LINUX_KERNEL_UIMAGE),y)
 131 LINUX_IMAGE_NAME = uImage
 132 else ifeq ($(BR2_LINUX_KERNEL_APPENDED_UIMAGE),y)
 133 LINUX_IMAGE_NAME = uImage
 134 else ifeq ($(BR2_LINUX_KERNEL_BZIMAGE),y)
 135 LINUX_IMAGE_NAME = bzImage
 136 else ifeq ($(BR2_LINUX_KERNEL_ZIMAGE),y)
 137 LINUX_IMAGE_NAME = zImage
 138 else ifeq ($(BR2_LINUX_KERNEL_ZIMAGE_EPAPR),y)
 139 LINUX_IMAGE_NAME = zImage.epapr
 140 else ifeq ($(BR2_LINUX_KERNEL_APPENDED_ZIMAGE),y)
 141 LINUX_IMAGE_NAME = zImage
 142 else ifeq ($(BR2_LINUX_KERNEL_CUIMAGE),y)
 143 LINUX_IMAGE_NAME = cuImage.$(KERNEL_DTS_NAME)
 144 else ifeq ($(BR2_LINUX_KERNEL_SIMPLEIMAGE),y)
 145 LINUX_IMAGE_NAME = simpleImage.$(KERNEL_DTS_NAME)
 146 else ifeq ($(BR2_LINUX_KERNEL_IMAGE),y)
 147 LINUX_IMAGE_NAME = Image
 148 else ifeq ($(BR2_LINUX_KERNEL_LINUX_BIN),y)
 149 LINUX_IMAGE_NAME = linux.bin
 150 else ifeq ($(BR2_LINUX_KERNEL_VMLINUX_BIN),y)
 151 LINUX_IMAGE_NAME = vmlinux.bin
 152 else ifeq ($(BR2_LINUX_KERNEL_VMLINUX),y)
 153 LINUX_IMAGE_NAME = vmlinux
 154 else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ),y)
 155 LINUX_IMAGE_NAME = vmlinuz
 156 else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ_BIN),y)
 157 LINUX_IMAGE_NAME = vmlinuz.bin
 158 endif
 159 # The if-else blocks above are all the image types we know of, and all
 160 # come from a Kconfig choice, so we know we have LINUX_IMAGE_NAME set
 161 # to something
 162 LINUX_TARGET_NAME = $(LINUX_IMAGE_NAME)
 163 endif
 164
 165 LINUX_KERNEL_UIMAGE_LOADADDR = $(call qstrip,$(BR2_LINUX_KERNEL_UIMAGE_LOADADDR))
 166 ifneq ($(LINUX_KERNEL_UIMAGE_LOADADDR),)
 167 LINUX_MAKE_FLAGS += LOADADDR="$(LINUX_KERNEL_UIMAGE_LOADADDR)"
 168 endif
 169
 170 # Compute the arch path, since i386 and x86_64 are in arch/x86 and not
 171 # in arch/$(KERNEL_ARCH). Even if the kernel creates symbolic links
 172 # for bzImage, arch/i386 and arch/x86_64 do not exist when copying the
 173 # defconfig file.
 174 ifeq ($(KERNEL_ARCH),i386)
 175 KERNEL_ARCH_PATH = $(LINUX_DIR)/arch/x86
 176 else ifeq ($(KERNEL_ARCH),x86_64)
 177 KERNEL_ARCH_PATH = $(LINUX_DIR)/arch/x86
 178 else
 179 KERNEL_ARCH_PATH = $(LINUX_DIR)/arch/$(KERNEL_ARCH)
 180 endif
 181
 182 ifeq ($(BR2_LINUX_KERNEL_VMLINUX),y)
 183 LINUX_IMAGE_PATH = $(LINUX_DIR)/$(LINUX_IMAGE_NAME)
 184 else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ),y)
 185 LINUX_IMAGE_PATH = $(LINUX_DIR)/$(LINUX_IMAGE_NAME)
 186 else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ_BIN),y)
 187 LINUX_IMAGE_PATH = $(LINUX_DIR)/$(LINUX_IMAGE_NAME)
 188 else
 189 LINUX_IMAGE_PATH = $(KERNEL_ARCH_PATH)/boot/$(LINUX_IMAGE_NAME)
 190 endif # BR2_LINUX_KERNEL_VMLINUX
 191
 192 define LINUX_APPLY_LOCAL_PATCHES
 193         for p in $(filter-out ftp://% http://% https://%,$(LINUX_PATCHES)) ; do \
 194                 if test -d $$p ; then \
 195                         $(APPLY_PATCHES) $(@D) $$p \*.patch || exit 1 ; \
 196                 else \
 197                         $(APPLY_PATCHES) $(@D) `dirname $$p` `basename $$p` || exit 1; \
 198                 fi \
 199         done
 200 endef
 201
 202 LINUX_POST_PATCH_HOOKS += LINUX_APPLY_LOCAL_PATCHES
 203
 204 # Older linux kernels use deprecated perl constructs in timeconst.pl
 205 # that were removed for perl 5.22+ so it breaks on newer distributions
 206 # Try a dry-run patch to see if this applies, if it does go ahead
 207 define LINUX_TRY_PATCH_TIMECONST
 208         @if patch -p1 --dry-run -f -s -d $(@D) <$(LINUX_PKGDIR)/0001-timeconst.pl-Eliminate-Perl-warning.patch.conditional >/dev/null ; then \
 209                 $(APPLY_PATCHES) $(@D) $(LINUX_PKGDIR) 0001-timeconst.pl-Eliminate-Perl-warning.patch.conditional ; \
 210         fi
 211 endef
 212 LINUX_POST_PATCH_HOOKS += LINUX_TRY_PATCH_TIMECONST
 213
 214 ifeq ($(BR2_LINUX_KERNEL_USE_DEFCONFIG),y)
 215 LINUX_KCONFIG_DEFCONFIG = $(call qstrip,$(BR2_LINUX_KERNEL_DEFCONFIG))_defconfig
 216 else ifeq ($(BR2_LINUX_KERNEL_USE_ARCH_DEFAULT_CONFIG),y)
 217 LINUX_KCONFIG_DEFCONFIG = defconfig
 218 else ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG),y)
 219 LINUX_KCONFIG_FILE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE))
 220 endif
 221 LINUX_KCONFIG_FRAGMENT_FILES = $(call qstrip,$(BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES))
 222 LINUX_KCONFIG_EDITORS = menuconfig xconfig gconfig nconfig
 223 LINUX_KCONFIG_OPTS = $(LINUX_MAKE_FLAGS)
 224
 225 # If no package has yet set it, set it from the Kconfig option
 226 LINUX_NEEDS_MODULES ?= $(BR2_LINUX_NEEDS_MODULES)
 227
 228 # Make sure the Linux kernel is built with the right endianness. Not
 229 # all architectures support
 230 # CONFIG_CPU_BIG_ENDIAN/CONFIG_CPU_LITTLE_ENDIAN in Linux, but the
 231 # option will be thrown away and ignored if it doesn't exist.
 232 ifeq ($(BR2_ENDIAN),"BIG")
 233 define LINUX_FIXUP_CONFIG_ENDIANNESS
 234         $(call KCONFIG_ENABLE_OPT,CONFIG_CPU_BIG_ENDIAN,$(@D)/.config)
 235 endef
 236 else
 237 define LINUX_FIXUP_CONFIG_ENDIANNESS
 238         $(call KCONFIG_ENABLE_OPT,CONFIG_CPU_LITTLE_ENDIAN,$(@D)/.config)
 239 endef
 240 endif
 241
 242 define LINUX_KCONFIG_FIXUP_CMDS
 243         $(if $(LINUX_NEEDS_MODULES),
 244                 $(call KCONFIG_ENABLE_OPT,CONFIG_MODULES,$(@D)/.config))
 245         $(call KCONFIG_ENABLE_OPT,$(LINUX_COMPRESSION_OPT_y),$(@D)/.config)
 246         $(foreach opt, $(LINUX_COMPRESSION_OPT_),
 247                 $(call KCONFIG_DISABLE_OPT,$(opt),$(@D)/.config)
 248         )
 249         $(LINUX_FIXUP_CONFIG_ENDIANNESS)
 250         $(if $(BR2_arm)$(BR2_armeb),
 251                 $(call KCONFIG_ENABLE_OPT,CONFIG_AEABI,$(@D)/.config))
 252         $(if $(BR2_TARGET_ROOTFS_CPIO),
 253                 $(call KCONFIG_ENABLE_OPT,CONFIG_BLK_DEV_INITRD,$(@D)/.config))
 254         # As the kernel gets compiled before root filesystems are
 255         # built, we create a fake cpio file. It'll be
 256         # replaced later by the real cpio archive, and the kernel will be
 257         # rebuilt using the linux-rebuild-with-initramfs target.
 258         $(if $(BR2_TARGET_ROOTFS_INITRAMFS),
 259                 touch $(BINARIES_DIR)/rootfs.cpio
 260                 $(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_SOURCE,"$${BR_BINARIES_DIR}/rootfs.cpio",$(@D)/.config)
 261                 $(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_ROOT_UID,0,$(@D)/.config)
 262                 $(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_ROOT_GID,0,$(@D)/.config))
 263         $(if $(BR2_ROOTFS_DEVICE_CREATION_STATIC),,
 264                 $(call KCONFIG_ENABLE_OPT,CONFIG_DEVTMPFS,$(@D)/.config)
 265                 $(call KCONFIG_ENABLE_OPT,CONFIG_DEVTMPFS_MOUNT,$(@D)/.config))
 266         $(if $(BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_EUDEV),
 267                 $(call KCONFIG_ENABLE_OPT,CONFIG_INOTIFY_USER,$(@D)/.config))
 268         $(if $(BR2_PACKAGE_KTAP),
 269                 $(call KCONFIG_ENABLE_OPT,CONFIG_DEBUG_FS,$(@D)/.config)
 270                 $(call KCONFIG_ENABLE_OPT,CONFIG_ENABLE_DEFAULT_TRACERS,$(@D)/.config)
 271                 $(call KCONFIG_ENABLE_OPT,CONFIG_PERF_EVENTS,$(@D)/.config)
 272                 $(call KCONFIG_ENABLE_OPT,CONFIG_FUNCTION_TRACER,$(@D)/.config))
 273         $(if $(BR2_PACKAGE_SYSTEMD),
 274                 $(call KCONFIG_ENABLE_OPT,CONFIG_CGROUPS,$(@D)/.config)
 275                 $(call KCONFIG_ENABLE_OPT,CONFIG_INOTIFY_USER,$(@D)/.config)
 276                 $(call KCONFIG_ENABLE_OPT,CONFIG_FHANDLE,$(@D)/.config)
 277                 $(call KCONFIG_ENABLE_OPT,CONFIG_AUTOFS4_FS,$(@D)/.config)
 278                 $(call KCONFIG_ENABLE_OPT,CONFIG_TMPFS_POSIX_ACL,$(@D)/.config)
 279                 $(call KCONFIG_ENABLE_OPT,CONFIG_TMPFS_POSIX_XATTR,$(@D)/.config))
 280         $(if $(BR2_PACKAGE_SMACK),
 281                 $(call KCONFIG_ENABLE_OPT,CONFIG_SECURITY,$(@D)/.config)
 282                 $(call KCONFIG_ENABLE_OPT,CONFIG_SECURITY_SMACK,$(@D)/.config)
 283                 $(call KCONFIG_ENABLE_OPT,CONFIG_SECURITY_NETWORK,$(@D)/.config))
 284         $(if $(BR2_PACKAGE_IPTABLES),
 285                 $(call KCONFIG_ENABLE_OPT,CONFIG_IP_NF_IPTABLES,$(@D)/.config)
 286                 $(call KCONFIG_ENABLE_OPT,CONFIG_IP_NF_FILTER,$(@D)/.config)
 287                 $(call KCONFIG_ENABLE_OPT,CONFIG_NETFILTER,$(@D)/.config)
 288                 $(call KCONFIG_ENABLE_OPT,CONFIG_NETFILTER_XTABLES,$(@D)/.config))
 289         $(if $(BR2_PACKAGE_XTABLES_ADDONS),
 290                 $(call KCONFIG_ENABLE_OPT,CONFIG_NETFILTER_ADVANCED,$(@D)/.config)
 291                 $(call KCONFIG_ENABLE_OPT,CONFIG_NF_CONNTRACK,$(@D)/.config)
 292                 $(call KCONFIG_ENABLE_OPT,CONFIG_NF_CONNTRACK_MARK,$(@D)/.config))
 293         $(if $(BR2_LINUX_KERNEL_APPENDED_DTB),
 294                 $(call KCONFIG_ENABLE_OPT,CONFIG_ARM_APPENDED_DTB,$(@D)/.config))
 295         $(if $(BR2_PACKAGE_KERNEL_MODULE_IMX_GPU_VIV),
 296                 $(call KCONFIG_DISABLE_OPT,CONFIG_MXC_GPU_VIV,$(@D)/.config))
 297 endef
 298
 299 ifeq ($(BR2_LINUX_KERNEL_DTS_SUPPORT),y)
 300 ifeq ($(BR2_LINUX_KERNEL_DTB_IS_SELF_BUILT),)
 301 define LINUX_BUILD_DTB
 302         $(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(KERNEL_DTBS)
 303 endef
 304 ifeq ($(BR2_LINUX_KERNEL_APPENDED_DTB),)
 305 define LINUX_INSTALL_DTB
 306         # dtbs moved from arch/<ARCH>/boot to arch/<ARCH>/boot/dts since 3.8-rc1
 307         cp $(addprefix \
 308                 $(KERNEL_ARCH_PATH)/boot/$(if $(wildcard \
 309                 $(addprefix $(KERNEL_ARCH_PATH)/boot/dts/,$(KERNEL_DTBS))),dts/),$(KERNEL_DTBS)) \
 310                 $(1)
 311 endef
 312 endif # BR2_LINUX_KERNEL_APPENDED_DTB
 313 endif # BR2_LINUX_KERNEL_DTB_IS_SELF_BUILT
 314 endif # BR2_LINUX_KERNEL_DTS_SUPPORT
 315
 316 ifeq ($(BR2_LINUX_KERNEL_APPENDED_DTB),y)
 317 # dtbs moved from arch/$ARCH/boot to arch/$ARCH/boot/dts since 3.8-rc1
 318 define LINUX_APPEND_DTB
 319         (cd $(KERNEL_ARCH_PATH)/boot; \
 320                 for dtb in $(KERNEL_DTS_NAME); do \
 321                         if test -e $${dtb}.dtb ; then \
 322                                 dtbpath=$${dtb}.dtb ; \
 323                         else \
 324                                 dtbpath=dts/$${dtb}.dtb ; \
 325                         fi ; \
 326                         cat zImage $${dtbpath} > zImage.$${dtb} || exit 1; \
 327                 done)
 328 endef
 329 ifeq ($(BR2_LINUX_KERNEL_APPENDED_UIMAGE),y)
 330 # We need to generate a new u-boot image that takes into
 331 # account the extra-size added by the device tree at the end
 332 # of the image. To do so, we first need to retrieve both load
 333 # address and entry point for the kernel from the already
 334 # generate uboot image before using mkimage -l.
 335 LINUX_APPEND_DTB += ; \
 336         MKIMAGE_ARGS=`$(MKIMAGE) -l $(LINUX_IMAGE_PATH) |\
 337         sed -n -e 's/Image Name:[ ]*\(.*\)/-n \1/p' -e 's/Load Address:/-a/p' -e 's/Entry Point:/-e/p'`; \
 338         for dtb in $(KERNEL_DTS_NAME); do \
 339                 $(MKIMAGE) -A $(MKIMAGE_ARCH) -O linux \
 340                         -T kernel -C none $${MKIMAGE_ARGS} \
 341                         -d $(KERNEL_ARCH_PATH)/boot/zImage.$${dtb} $(LINUX_IMAGE_PATH).$${dtb}; \
 342         done
 343 endif
 344 endif
 345
 346 # Compilation. We make sure the kernel gets rebuilt when the
 347 # configuration has changed.
 348 define LINUX_BUILD_CMDS
 349         $(if $(BR2_LINUX_KERNEL_USE_CUSTOM_DTS),
 350                 cp -f $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_DTS_PATH)) $(KERNEL_ARCH_PATH)/boot/dts/)
 351         $(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(LINUX_TARGET_NAME)
 352         @if grep -q "CONFIG_MODULES=y" $(@D)/.config; then      \
 353                 $(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) modules ;        \
 354         fi
 355         $(LINUX_BUILD_DTB)
 356         $(LINUX_APPEND_DTB)
 357 endef
 358
 359 ifeq ($(BR2_LINUX_KERNEL_APPENDED_DTB),y)
 360 # When a DTB was appended, install the potential several images with
 361 # appended DTBs.
 362 define LINUX_INSTALL_IMAGE
 363         mkdir -p $(1)
 364         cp $(KERNEL_ARCH_PATH)/boot/$(LINUX_IMAGE_NAME).* $(1)
 365 endef
 366 else
 367 # Otherwise, just install the unique image generated by the kernel
 368 # build process.
 369 define LINUX_INSTALL_IMAGE
 370         $(INSTALL) -m 0644 -D $(LINUX_IMAGE_PATH) $(1)/$(LINUX_IMAGE_NAME)
 371 endef
 372 endif
 373
 374 ifeq ($(BR2_LINUX_KERNEL_INSTALL_TARGET),y)
 375 define LINUX_INSTALL_KERNEL_IMAGE_TO_TARGET
 376         $(call LINUX_INSTALL_IMAGE,$(TARGET_DIR)/boot)
 377         $(call LINUX_INSTALL_DTB,$(TARGET_DIR)/boot)
 378 endef
 379 endif
 380
 381 define LINUX_INSTALL_HOST_TOOLS
 382         # Installing dtc (device tree compiler) as host tool, if selected
 383         if grep -q "CONFIG_DTC=y" $(@D)/.config; then   \
 384                 $(INSTALL) -D -m 0755 $(@D)/scripts/dtc/dtc $(HOST_DIR)/usr/bin/linux-dtc ;     \
 385                 if [ ! -e $(HOST_DIR)/usr/bin/dtc ]; then       \
 386                         ln -sf linux-dtc $(HOST_DIR)/usr/bin/dtc ;      \
 387                 fi      \
 388         fi
 389 endef
 390
 391
 392 define LINUX_INSTALL_IMAGES_CMDS
 393         $(call LINUX_INSTALL_IMAGE,$(BINARIES_DIR))
 394         $(call LINUX_INSTALL_DTB,$(BINARIES_DIR))
 395 endef
 396
 397 ifeq ($(BR2_STRIP_strip),y)
 398 LINUX_MAKE_FLAGS += INSTALL_MOD_STRIP=1
 399 endif
 400
 401 define LINUX_INSTALL_TARGET_CMDS
 402         $(LINUX_INSTALL_KERNEL_IMAGE_TO_TARGET)
 403         # Install modules and remove symbolic links pointing to build
 404         # directories, not relevant on the target
 405         @if grep -q "CONFIG_MODULES=y" $(@D)/.config; then      \
 406                 $(LINUX_MAKE_ENV) $(MAKE1) $(LINUX_MAKE_FLAGS) -C $(@D) modules_install; \
 407                 rm -f $(TARGET_DIR)/lib/modules/$(LINUX_VERSION_PROBED)/build ;         \
 408                 rm -f $(TARGET_DIR)/lib/modules/$(LINUX_VERSION_PROBED)/source ;        \
 409         fi
 410         $(LINUX_INSTALL_HOST_TOOLS)
 411 endef
 412
 413 # Include all our extensions.
 414 #
 415 # Note: our package infrastructure uses the full-path of the last-scanned
 416 # Makefile to determine what package we're currently defining, using the
 417 # last directory component in the path. As such, including other Makefile,
 418 # like below, before we call one of the *-package macro is usally not
 419 # working.
 420 # However, since the files we include here are in the same directory as
 421 # the current Makefile, we are OK. But this is a hard requirement: files
 422 # included here *must* be in the same directory!
 423 include $(sort $(wildcard linux/linux-ext-*.mk))
 424
 425 LINUX_PATCH_DEPENDENCIES += $(foreach ext,$(LINUX_EXTENSIONS),\
 426         $(if $(BR2_LINUX_KERNEL_EXT_$(call UPPERCASE,$(ext))),$(ext)))
 427
 428 LINUX_PRE_PATCH_HOOKS += $(foreach ext,$(LINUX_EXTENSIONS),\
 429         $(if $(BR2_LINUX_KERNEL_EXT_$(call UPPERCASE,$(ext))),\
 430                 $(call UPPERCASE,$(ext))_PREPARE_KERNEL))
 431
 432 # Checks to give errors that the user can understand
 433
 434 # When a custom repository has been set, check for the repository version
 435 ifeq ($(BR2_LINUX_KERNEL_CUSTOM_SVN)$(BR2_LINUX_KERNEL_CUSTOM_GIT)$(BR2_LINUX_KERNEL_CUSTOM_HG),y)
 436 ifeq ($(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION)),)
 437 $(error No custom repository version set. Check your BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION setting)
 438 endif
 439 ifeq ($(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_URL)),)
 440 $(error No custom repo URL set. Check your BR2_LINUX_KERNEL_CUSTOM_REPO_URL setting)
 441 endif
 442 endif
 443
 444 ifeq ($(BR_BUILDING),y)
 445
 446 ifeq ($(BR2_LINUX_KERNEL_USE_DEFCONFIG),y)
 447 # We must use the user-supplied kconfig value, because
 448 # LINUX_KCONFIG_DEFCONFIG will at least contain the
 449 # trailing _defconfig
 450 ifeq ($(call qstrip,$(BR2_LINUX_KERNEL_DEFCONFIG)),)
 451 $(error No kernel defconfig name specified, check your BR2_LINUX_KERNEL_DEFCONFIG setting)
 452 endif
 453 endif
 454
 455 ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG),y)
 456 ifeq ($(LINUX_KCONFIG_FILE),)
 457 $(error No kernel configuration file specified, check your BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE setting)
 458 endif
 459 endif
 460
 461 ifeq ($(BR2_LINUX_KERNEL_DTS_SUPPORT)$(KERNEL_DTS_NAME),y)
 462 $(error No kernel device tree source specified, check your \
 463 BR2_LINUX_KERNEL_USE_INTREE_DTS / BR2_LINUX_KERNEL_USE_CUSTOM_DTS settings)
 464 endif
 465
 466 endif # BR_BUILDING
 467
 468 $(eval $(kconfig-package))
 469
 470 # Support for rebuilding the kernel after the cpio archive has
 471 # been generated in $(BINARIES_DIR)/rootfs.cpio.
 472 $(LINUX_DIR)/.stamp_initramfs_rebuilt: $(LINUX_DIR)/.stamp_target_installed $(LINUX_DIR)/.stamp_images_installed $(BINARIES_DIR)/rootfs.cpio
 473         @$(call MESSAGE,"Rebuilding kernel with initramfs")
 474         # Build the kernel.
 475         $(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(LINUX_TARGET_NAME)
 476         $(LINUX_APPEND_DTB)
 477         # Copy the kernel image(s) to its(their) final destination
 478         $(call LINUX_INSTALL_IMAGE,$(BINARIES_DIR))
 479         # If there is a .ub file copy it to the final destination
 480         test ! -f $(LINUX_IMAGE_PATH).ub || cp $(LINUX_IMAGE_PATH).ub $(BINARIES_DIR)
 481         $(Q)touch $@
 482
 483 # The initramfs building code must make sure this target gets called
 484 # after it generated the initramfs list of files.
 485 linux-rebuild-with-initramfs: $(LINUX_DIR)/.stamp_initramfs_rebuilt