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 $(LINUX_TARBALL))
  23 else ifeq ($(BR2_LINUX_KERNEL_CUSTOM_GIT),y)
  24 LINUX_SITE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_URL))
  25 LINUX_SITE_METHOD = git
  26 else ifeq ($(BR2_LINUX_KERNEL_CUSTOM_HG),y)
  27 LINUX_SITE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_URL))
  28 LINUX_SITE_METHOD = hg
  29 else ifeq ($(BR2_LINUX_KERNEL_CUSTOM_SVN),y)
  30 LINUX_SITE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_URL))
  31 LINUX_SITE_METHOD = svn
  32 else ifeq ($(BR2_LINUX_KERNEL_LATEST_CIP_VERSION),y)
  33 LINUX_SITE = git://git.kernel.org/pub/scm/linux/kernel/git/bwh/linux-cip.git
  34 else ifneq ($(findstring -rc,$(LINUX_VERSION)),)
  35 # Since 4.12-rc1, -rc kernels are generated from cgit. This also works for
  36 # older -rc kernels.
  37 LINUX_SITE = https://git.kernel.org/torvalds/t
  38 else
  39 LINUX_SOURCE = linux-$(LINUX_VERSION).tar.xz
  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 = $(BR2_KERNEL_MIRROR)/linux/kernel/v4.x
  49 endif
  50 endif
  51
  52 ifeq ($(BR2_LINUX_KERNEL)$(BR2_LINUX_KERNEL_LATEST_VERSION),y)
  53 BR_NO_CHECK_HASH_FOR += $(LINUX_SOURCE)
  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-bison host-flex 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_NEEDS_HOST_OPENSSL),y)
  84 LINUX_DEPENDENCIES += host-openssl
  85 endif
  86
  87 ifeq ($(BR2_LINUX_KERNEL_NEEDS_HOST_LIBELF),y)
  88 LINUX_DEPENDENCIES += host-elfutils
  89 endif
  90
  91 # If host-uboot-tools is selected by the user, assume it is needed to
  92 # create a custom image
  93 ifeq ($(BR2_PACKAGE_HOST_UBOOT_TOOLS),y)
  94 LINUX_DEPENDENCIES += host-uboot-tools
  95 endif
  96
  97 ifneq ($(ARCH_XTENSA_OVERLAY_FILE),)
  98 define LINUX_XTENSA_OVERLAY_EXTRACT
  99         $(call arch-xtensa-overlay-extract,$(@D),linux)
 100 endef
 101 LINUX_POST_EXTRACT_HOOKS += LINUX_XTENSA_OVERLAY_EXTRACT
 102 LINUX_EXTRA_DOWNLOADS += $(ARCH_XTENSA_OVERLAY_URL)
 103 endif
 104
 105 LINUX_MAKE_FLAGS = \
 106         HOSTCC="$(HOSTCC) $(HOST_CFLAGS) $(HOST_LDFLAGS)" \
 107         ARCH=$(KERNEL_ARCH) \
 108         INSTALL_MOD_PATH=$(TARGET_DIR) \
 109         CROSS_COMPILE="$(TARGET_CROSS)" \
 110         DEPMOD=$(HOST_DIR)/sbin/depmod
 111
 112 LINUX_MAKE_ENV = \
 113         $(TARGET_MAKE_ENV) \
 114         BR_BINARIES_DIR=$(BINARIES_DIR)
 115
 116 ifeq ($(BR2_REPRODUCIBLE),y)
 117 LINUX_MAKE_ENV += \
 118         KBUILD_BUILD_VERSION=1 \
 119         KBUILD_BUILD_USER=buildroot \
 120         KBUILD_BUILD_HOST=buildroot \
 121         KBUILD_BUILD_TIMESTAMP="$(shell LC_ALL=C date -d @$(SOURCE_DATE_EPOCH))"
 122 endif
 123
 124 # Get the real Linux version, which tells us where kernel modules are
 125 # going to be installed in the target filesystem.
 126 LINUX_VERSION_PROBED = `$(MAKE) $(LINUX_MAKE_FLAGS) -C $(LINUX_DIR) --no-print-directory -s kernelrelease 2>/dev/null`
 127
 128 LINUX_DTS_NAME += $(call qstrip,$(BR2_LINUX_KERNEL_INTREE_DTS_NAME))
 129
 130 # We keep only the .dts files, so that the user can specify both .dts
 131 # and .dtsi files in BR2_LINUX_KERNEL_CUSTOM_DTS_PATH. Both will be
 132 # copied to arch/<arch>/boot/dts, but only the .dts files will
 133 # actually be generated as .dtb.
 134 LINUX_DTS_NAME += $(basename $(filter %.dts,$(notdir $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_DTS_PATH)))))
 135
 136 LINUX_DTBS = $(addsuffix .dtb,$(LINUX_DTS_NAME))
 137
 138 ifeq ($(BR2_LINUX_KERNEL_IMAGE_TARGET_CUSTOM),y)
 139 LINUX_IMAGE_NAME = $(call qstrip,$(BR2_LINUX_KERNEL_IMAGE_NAME))
 140 LINUX_TARGET_NAME = $(call qstrip,$(BR2_LINUX_KERNEL_IMAGE_TARGET_NAME))
 141 ifeq ($(LINUX_IMAGE_NAME),)
 142 LINUX_IMAGE_NAME = $(LINUX_TARGET_NAME)
 143 endif
 144 else
 145 ifeq ($(BR2_LINUX_KERNEL_UIMAGE),y)
 146 LINUX_IMAGE_NAME = uImage
 147 else ifeq ($(BR2_LINUX_KERNEL_APPENDED_UIMAGE),y)
 148 LINUX_IMAGE_NAME = uImage
 149 else ifeq ($(BR2_LINUX_KERNEL_BZIMAGE),y)
 150 LINUX_IMAGE_NAME = bzImage
 151 else ifeq ($(BR2_LINUX_KERNEL_ZIMAGE),y)
 152 LINUX_IMAGE_NAME = zImage
 153 else ifeq ($(BR2_LINUX_KERNEL_ZIMAGE_EPAPR),y)
 154 LINUX_IMAGE_NAME = zImage.epapr
 155 else ifeq ($(BR2_LINUX_KERNEL_APPENDED_ZIMAGE),y)
 156 LINUX_IMAGE_NAME = zImage
 157 else ifeq ($(BR2_LINUX_KERNEL_CUIMAGE),y)
 158 LINUX_IMAGE_NAME = cuImage.$(firstword $(LINUX_DTS_NAME))
 159 else ifeq ($(BR2_LINUX_KERNEL_SIMPLEIMAGE),y)
 160 LINUX_IMAGE_NAME = simpleImage.$(firstword $(LINUX_DTS_NAME))
 161 else ifeq ($(BR2_LINUX_KERNEL_IMAGE),y)
 162 LINUX_IMAGE_NAME = Image
 163 else ifeq ($(BR2_LINUX_KERNEL_LINUX_BIN),y)
 164 LINUX_IMAGE_NAME = linux.bin
 165 else ifeq ($(BR2_LINUX_KERNEL_VMLINUX_BIN),y)
 166 LINUX_IMAGE_NAME = vmlinux.bin
 167 else ifeq ($(BR2_LINUX_KERNEL_VMLINUX),y)
 168 LINUX_IMAGE_NAME = vmlinux
 169 else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ),y)
 170 LINUX_IMAGE_NAME = vmlinuz
 171 else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ_BIN),y)
 172 LINUX_IMAGE_NAME = vmlinuz.bin
 173 endif
 174 # The if-else blocks above are all the image types we know of, and all
 175 # come from a Kconfig choice, so we know we have LINUX_IMAGE_NAME set
 176 # to something
 177 LINUX_TARGET_NAME = $(LINUX_IMAGE_NAME)
 178 endif
 179
 180 LINUX_KERNEL_UIMAGE_LOADADDR = $(call qstrip,$(BR2_LINUX_KERNEL_UIMAGE_LOADADDR))
 181 ifneq ($(LINUX_KERNEL_UIMAGE_LOADADDR),)
 182 LINUX_MAKE_FLAGS += LOADADDR="$(LINUX_KERNEL_UIMAGE_LOADADDR)"
 183 endif
 184
 185 # Compute the arch path, since i386 and x86_64 are in arch/x86 and not
 186 # in arch/$(KERNEL_ARCH). Even if the kernel creates symbolic links
 187 # for bzImage, arch/i386 and arch/x86_64 do not exist when copying the
 188 # defconfig file.
 189 ifeq ($(KERNEL_ARCH),i386)
 190 LINUX_ARCH_PATH = $(LINUX_DIR)/arch/x86
 191 else ifeq ($(KERNEL_ARCH),x86_64)
 192 LINUX_ARCH_PATH = $(LINUX_DIR)/arch/x86
 193 else
 194 LINUX_ARCH_PATH = $(LINUX_DIR)/arch/$(KERNEL_ARCH)
 195 endif
 196
 197 ifeq ($(BR2_LINUX_KERNEL_VMLINUX),y)
 198 LINUX_IMAGE_PATH = $(LINUX_DIR)/$(LINUX_IMAGE_NAME)
 199 else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ),y)
 200 LINUX_IMAGE_PATH = $(LINUX_DIR)/$(LINUX_IMAGE_NAME)
 201 else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ_BIN),y)
 202 LINUX_IMAGE_PATH = $(LINUX_DIR)/$(LINUX_IMAGE_NAME)
 203 else
 204 LINUX_IMAGE_PATH = $(LINUX_ARCH_PATH)/boot/$(LINUX_IMAGE_NAME)
 205 endif # BR2_LINUX_KERNEL_VMLINUX
 206
 207 define LINUX_APPLY_LOCAL_PATCHES
 208         for p in $(filter-out ftp://% http://% https://%,$(LINUX_PATCHES)) ; do \
 209                 if test -d $$p ; then \
 210                         $(APPLY_PATCHES) $(@D) $$p \*.patch || exit 1 ; \
 211                 else \
 212                         $(APPLY_PATCHES) $(@D) `dirname $$p` `basename $$p` || exit 1; \
 213                 fi \
 214         done
 215 endef
 216
 217 LINUX_POST_PATCH_HOOKS += LINUX_APPLY_LOCAL_PATCHES
 218
 219 # Older linux kernels use deprecated perl constructs in timeconst.pl
 220 # that were removed for perl 5.22+ so it breaks on newer distributions
 221 # Try a dry-run patch to see if this applies, if it does go ahead
 222 define LINUX_TRY_PATCH_TIMECONST
 223         @if patch -p1 --dry-run -f -s -d $(@D) <$(LINUX_PKGDIR)/0001-timeconst.pl-Eliminate-Perl-warning.patch.conditional >/dev/null ; then \
 224                 $(APPLY_PATCHES) $(@D) $(LINUX_PKGDIR) 0001-timeconst.pl-Eliminate-Perl-warning.patch.conditional ; \
 225         fi
 226 endef
 227 LINUX_POST_PATCH_HOOKS += LINUX_TRY_PATCH_TIMECONST
 228
 229 ifeq ($(BR2_LINUX_KERNEL_USE_DEFCONFIG),y)
 230 LINUX_KCONFIG_DEFCONFIG = $(call qstrip,$(BR2_LINUX_KERNEL_DEFCONFIG))_defconfig
 231 else ifeq ($(BR2_LINUX_KERNEL_USE_ARCH_DEFAULT_CONFIG),y)
 232 LINUX_KCONFIG_DEFCONFIG = defconfig
 233 else ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG),y)
 234 LINUX_KCONFIG_FILE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE))
 235 endif
 236 LINUX_KCONFIG_FRAGMENT_FILES = $(call qstrip,$(BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES))
 237 LINUX_KCONFIG_EDITORS = menuconfig xconfig gconfig nconfig
 238 LINUX_KCONFIG_OPTS = $(LINUX_MAKE_FLAGS)
 239
 240 # If no package has yet set it, set it from the Kconfig option
 241 LINUX_NEEDS_MODULES ?= $(BR2_LINUX_NEEDS_MODULES)
 242
 243 # Make sure the Linux kernel is built with the right endianness. Not
 244 # all architectures support
 245 # CONFIG_CPU_BIG_ENDIAN/CONFIG_CPU_LITTLE_ENDIAN in Linux, but the
 246 # option will be thrown away and ignored if it doesn't exist.
 247 ifeq ($(BR2_ENDIAN),"BIG")
 248 define LINUX_FIXUP_CONFIG_ENDIANNESS
 249         $(call KCONFIG_ENABLE_OPT,CONFIG_CPU_BIG_ENDIAN,$(@D)/.config)
 250 endef
 251 else
 252 define LINUX_FIXUP_CONFIG_ENDIANNESS
 253         $(call KCONFIG_ENABLE_OPT,CONFIG_CPU_LITTLE_ENDIAN,$(@D)/.config)
 254 endef
 255 endif
 256
 257 define LINUX_KCONFIG_FIXUP_CMDS
 258         $(if $(LINUX_NEEDS_MODULES),
 259                 $(call KCONFIG_ENABLE_OPT,CONFIG_MODULES,$(@D)/.config))
 260         $(call KCONFIG_ENABLE_OPT,$(strip $(LINUX_COMPRESSION_OPT_y)),$(@D)/.config)
 261         $(foreach opt, $(LINUX_COMPRESSION_OPT_),
 262                 $(call KCONFIG_DISABLE_OPT,$(opt),$(@D)/.config)
 263         )
 264         $(LINUX_FIXUP_CONFIG_ENDIANNESS)
 265         $(if $(BR2_arm)$(BR2_armeb),
 266                 $(call KCONFIG_ENABLE_OPT,CONFIG_AEABI,$(@D)/.config))
 267         $(if $(BR2_TARGET_ROOTFS_CPIO),
 268                 $(call KCONFIG_ENABLE_OPT,CONFIG_BLK_DEV_INITRD,$(@D)/.config))
 269         # As the kernel gets compiled before root filesystems are
 270         # built, we create a fake cpio file. It'll be
 271         # replaced later by the real cpio archive, and the kernel will be
 272         # rebuilt using the linux-rebuild-with-initramfs target.
 273         $(if $(BR2_TARGET_ROOTFS_INITRAMFS),
 274                 touch $(BINARIES_DIR)/rootfs.cpio
 275                 $(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_SOURCE,"$${BR_BINARIES_DIR}/rootfs.cpio",$(@D)/.config)
 276                 $(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_ROOT_UID,0,$(@D)/.config)
 277                 $(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_ROOT_GID,0,$(@D)/.config))
 278         $(if $(BR2_ROOTFS_DEVICE_CREATION_STATIC),,
 279                 $(call KCONFIG_ENABLE_OPT,CONFIG_DEVTMPFS,$(@D)/.config)
 280                 $(call KCONFIG_ENABLE_OPT,CONFIG_DEVTMPFS_MOUNT,$(@D)/.config))
 281         $(if $(BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_EUDEV),
 282                 $(call KCONFIG_ENABLE_OPT,CONFIG_INOTIFY_USER,$(@D)/.config))
 283         $(if $(BR2_PACKAGE_KTAP),
 284                 $(call KCONFIG_ENABLE_OPT,CONFIG_DEBUG_FS,$(@D)/.config)
 285                 $(call KCONFIG_ENABLE_OPT,CONFIG_ENABLE_DEFAULT_TRACERS,$(@D)/.config)
 286                 $(call KCONFIG_ENABLE_OPT,CONFIG_PERF_EVENTS,$(@D)/.config)
 287                 $(call KCONFIG_ENABLE_OPT,CONFIG_FUNCTION_TRACER,$(@D)/.config))
 288         $(if $(BR2_PACKAGE_SYSTEMD),
 289                 $(call KCONFIG_ENABLE_OPT,CONFIG_CGROUPS,$(@D)/.config)
 290                 $(call KCONFIG_ENABLE_OPT,CONFIG_INOTIFY_USER,$(@D)/.config)
 291                 $(call KCONFIG_ENABLE_OPT,CONFIG_FHANDLE,$(@D)/.config)
 292                 $(call KCONFIG_ENABLE_OPT,CONFIG_AUTOFS4_FS,$(@D)/.config)
 293                 $(call KCONFIG_ENABLE_OPT,CONFIG_TMPFS_POSIX_ACL,$(@D)/.config)
 294                 $(call KCONFIG_ENABLE_OPT,CONFIG_TMPFS_XATTR,$(@D)/.config))
 295         $(if $(BR2_PACKAGE_SMACK),
 296                 $(call KCONFIG_ENABLE_OPT,CONFIG_SECURITY,$(@D)/.config)
 297                 $(call KCONFIG_ENABLE_OPT,CONFIG_SECURITY_SMACK,$(@D)/.config)
 298                 $(call KCONFIG_ENABLE_OPT,CONFIG_SECURITY_NETWORK,$(@D)/.config))
 299         $(if $(BR2_PACKAGE_SUNXI_MALI_MAINLINE_DRIVER),
 300                 $(call KCONFIG_ENABLE_OPT,CONFIG_CMA,$(@D)/.config)
 301                 $(call KCONFIG_ENABLE_OPT,CONFIG_DMA_CMA,$(@D)/.config))
 302         $(if $(BR2_PACKAGE_IPTABLES),
 303                 $(call KCONFIG_ENABLE_OPT,CONFIG_IP_NF_IPTABLES,$(@D)/.config)
 304                 $(call KCONFIG_ENABLE_OPT,CONFIG_IP_NF_FILTER,$(@D)/.config)
 305                 $(call KCONFIG_ENABLE_OPT,CONFIG_NETFILTER,$(@D)/.config)
 306                 $(call KCONFIG_ENABLE_OPT,CONFIG_NETFILTER_XTABLES,$(@D)/.config))
 307         $(if $(BR2_PACKAGE_XTABLES_ADDONS),
 308                 $(call KCONFIG_ENABLE_OPT,CONFIG_NETFILTER_ADVANCED,$(@D)/.config)
 309                 $(call KCONFIG_ENABLE_OPT,CONFIG_NF_CONNTRACK,$(@D)/.config)
 310                 $(call KCONFIG_ENABLE_OPT,CONFIG_NF_CONNTRACK_MARK,$(@D)/.config))
 311         $(if $(BR2_PACKAGE_WIREGUARD),
 312                 $(call KCONFIG_ENABLE_OPT,CONFIG_INET,$(@D)/.config)
 313                 $(call KCONFIG_ENABLE_OPT,CONFIG_NET,$(@D)/.config)
 314                 $(call KCONFIG_ENABLE_OPT,CONFIG_NET_FOU,$(@D)/.config)
 315                 $(call KCONFIG_ENABLE_OPT,CONFIG_CRYPTO,$(@D)/.config)
 316                 $(call KCONFIG_ENABLE_OPT,CONFIG_CRYPTO_MANAGER,$(@D)/.config))
 317         $(if $(BR2_LINUX_KERNEL_APPENDED_DTB),
 318                 $(call KCONFIG_ENABLE_OPT,CONFIG_ARM_APPENDED_DTB,$(@D)/.config))
 319         $(if $(BR2_PACKAGE_KERNEL_MODULE_IMX_GPU_VIV),
 320                 $(call KCONFIG_DISABLE_OPT,CONFIG_MXC_GPU_VIV,$(@D)/.config))
 321 endef
 322
 323 ifeq ($(BR2_LINUX_KERNEL_DTS_SUPPORT),y)
 324 ifeq ($(BR2_LINUX_KERNEL_DTB_IS_SELF_BUILT),)
 325 define LINUX_BUILD_DTB
 326         $(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(LINUX_DTBS)
 327 endef
 328 ifeq ($(BR2_LINUX_KERNEL_APPENDED_DTB),)
 329 define LINUX_INSTALL_DTB
 330         # dtbs moved from arch/<ARCH>/boot to arch/<ARCH>/boot/dts since 3.8-rc1
 331         cp $(addprefix \
 332                 $(LINUX_ARCH_PATH)/boot/$(if $(wildcard \
 333                 $(addprefix $(LINUX_ARCH_PATH)/boot/dts/,$(LINUX_DTBS))),dts/),$(LINUX_DTBS)) \
 334                 $(1)
 335 endef
 336 endif # BR2_LINUX_KERNEL_APPENDED_DTB
 337 endif # BR2_LINUX_KERNEL_DTB_IS_SELF_BUILT
 338 endif # BR2_LINUX_KERNEL_DTS_SUPPORT
 339
 340 ifeq ($(BR2_LINUX_KERNEL_APPENDED_DTB),y)
 341 # dtbs moved from arch/$ARCH/boot to arch/$ARCH/boot/dts since 3.8-rc1
 342 define LINUX_APPEND_DTB
 343         (cd $(LINUX_ARCH_PATH)/boot; \
 344                 for dtb in $(LINUX_DTS_NAME); do \
 345                         if test -e $${dtb}.dtb ; then \
 346                                 dtbpath=$${dtb}.dtb ; \
 347                         else \
 348                                 dtbpath=dts/$${dtb}.dtb ; \
 349                         fi ; \
 350                         cat zImage $${dtbpath} > zImage.$${dtb} || exit 1; \
 351                 done)
 352 endef
 353 ifeq ($(BR2_LINUX_KERNEL_APPENDED_UIMAGE),y)
 354 # We need to generate a new u-boot image that takes into
 355 # account the extra-size added by the device tree at the end
 356 # of the image. To do so, we first need to retrieve both load
 357 # address and entry point for the kernel from the already
 358 # generate uboot image before using mkimage -l.
 359 LINUX_APPEND_DTB += ; \
 360         MKIMAGE_ARGS=`$(MKIMAGE) -l $(LINUX_IMAGE_PATH) |\
 361         sed -n -e 's/Image Name:[ ]*\(.*\)/-n \1/p' -e 's/Load Address:/-a/p' -e 's/Entry Point:/-e/p'`; \
 362         for dtb in $(LINUX_DTS_NAME); do \
 363                 $(MKIMAGE) -A $(MKIMAGE_ARCH) -O linux \
 364                         -T kernel -C none $${MKIMAGE_ARGS} \
 365                         -d $(LINUX_ARCH_PATH)/boot/zImage.$${dtb} $(LINUX_IMAGE_PATH).$${dtb}; \
 366         done
 367 endif
 368 endif
 369
 370 # Compilation. We make sure the kernel gets rebuilt when the
 371 # configuration has changed.
 372 define LINUX_BUILD_CMDS
 373         @for dts in $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_DTS_PATH)); do \
 374                 cp -f $${dts} $(LINUX_ARCH_PATH)/boot/dts/ ; \
 375         done
 376         $(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(LINUX_TARGET_NAME)
 377         @if grep -q "CONFIG_MODULES=y" $(@D)/.config; then \
 378                 $(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) modules ; \
 379         fi
 380         $(LINUX_BUILD_DTB)
 381         $(LINUX_APPEND_DTB)
 382 endef
 383
 384 ifeq ($(BR2_LINUX_KERNEL_APPENDED_DTB),y)
 385 # When a DTB was appended, install the potential several images with
 386 # appended DTBs.
 387 define LINUX_INSTALL_IMAGE
 388         mkdir -p $(1)
 389         cp $(LINUX_ARCH_PATH)/boot/$(LINUX_IMAGE_NAME).* $(1)
 390 endef
 391 else
 392 # Otherwise, just install the unique image generated by the kernel
 393 # build process.
 394 define LINUX_INSTALL_IMAGE
 395         $(INSTALL) -m 0644 -D $(LINUX_IMAGE_PATH) $(1)/$(LINUX_IMAGE_NAME)
 396 endef
 397 endif
 398
 399 ifeq ($(BR2_LINUX_KERNEL_INSTALL_TARGET),y)
 400 define LINUX_INSTALL_KERNEL_IMAGE_TO_TARGET
 401         $(call LINUX_INSTALL_IMAGE,$(TARGET_DIR)/boot)
 402         $(call LINUX_INSTALL_DTB,$(TARGET_DIR)/boot)
 403 endef
 404 endif
 405
 406 define LINUX_INSTALL_HOST_TOOLS
 407         # Installing dtc (device tree compiler) as host tool, if selected
 408         if grep -q "CONFIG_DTC=y" $(@D)/.config; then \
 409                 $(INSTALL) -D -m 0755 $(@D)/scripts/dtc/dtc $(HOST_DIR)/bin/linux-dtc ; \
 410                 if [ ! -e $(HOST_DIR)/bin/dtc ]; then \
 411                         ln -sf linux-dtc $(HOST_DIR)/bin/dtc ; \
 412                 fi \
 413         fi
 414 endef
 415
 416 define LINUX_INSTALL_IMAGES_CMDS
 417         $(call LINUX_INSTALL_IMAGE,$(BINARIES_DIR))
 418         $(call LINUX_INSTALL_DTB,$(BINARIES_DIR))
 419 endef
 420
 421 ifeq ($(BR2_STRIP_strip),y)
 422 LINUX_MAKE_FLAGS += INSTALL_MOD_STRIP=1
 423 endif
 424
 425 define LINUX_INSTALL_TARGET_CMDS
 426         $(LINUX_INSTALL_KERNEL_IMAGE_TO_TARGET)
 427         # Install modules and remove symbolic links pointing to build
 428         # directories, not relevant on the target
 429         @if grep -q "CONFIG_MODULES=y" $(@D)/.config; then \
 430                 $(LINUX_MAKE_ENV) $(MAKE1) $(LINUX_MAKE_FLAGS) -C $(@D) modules_install; \
 431                 rm -f $(TARGET_DIR)/lib/modules/$(LINUX_VERSION_PROBED)/build ; \
 432                 rm -f $(TARGET_DIR)/lib/modules/$(LINUX_VERSION_PROBED)/source ; \
 433         fi
 434         $(LINUX_INSTALL_HOST_TOOLS)
 435 endef
 436
 437 # Include all our extensions.
 438 #
 439 # Note: our package infrastructure uses the full-path of the last-scanned
 440 # Makefile to determine what package we're currently defining, using the
 441 # last directory component in the path. As such, including other Makefile,
 442 # like below, before we call one of the *-package macro is usally not
 443 # working.
 444 # However, since the files we include here are in the same directory as
 445 # the current Makefile, we are OK. But this is a hard requirement: files
 446 # included here *must* be in the same directory!
 447 include $(sort $(wildcard linux/linux-ext-*.mk))
 448
 449 LINUX_PATCH_DEPENDENCIES += $(foreach ext,$(LINUX_EXTENSIONS),\
 450         $(if $(BR2_LINUX_KERNEL_EXT_$(call UPPERCASE,$(ext))),$(ext)))
 451
 452 LINUX_PRE_PATCH_HOOKS += $(foreach ext,$(LINUX_EXTENSIONS),\
 453         $(if $(BR2_LINUX_KERNEL_EXT_$(call UPPERCASE,$(ext))),\
 454                 $(call UPPERCASE,$(ext))_PREPARE_KERNEL))
 455
 456 # Checks to give errors that the user can understand
 457
 458 # When a custom repository has been set, check for the repository version
 459 ifeq ($(BR2_LINUX_KERNEL_CUSTOM_SVN)$(BR2_LINUX_KERNEL_CUSTOM_GIT)$(BR2_LINUX_KERNEL_CUSTOM_HG),y)
 460 ifeq ($(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION)),)
 461 $(error No custom repository version set. Check your BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION setting)
 462 endif
 463 ifeq ($(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_URL)),)
 464 $(error No custom repo URL set. Check your BR2_LINUX_KERNEL_CUSTOM_REPO_URL setting)
 465 endif
 466 endif
 467
 468 ifeq ($(BR_BUILDING),y)
 469
 470 ifeq ($(BR2_LINUX_KERNEL_USE_DEFCONFIG),y)
 471 # We must use the user-supplied kconfig value, because
 472 # LINUX_KCONFIG_DEFCONFIG will at least contain the
 473 # trailing _defconfig
 474 ifeq ($(call qstrip,$(BR2_LINUX_KERNEL_DEFCONFIG)),)
 475 $(error No kernel defconfig name specified, check your BR2_LINUX_KERNEL_DEFCONFIG setting)
 476 endif
 477 endif
 478
 479 ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG),y)
 480 ifeq ($(LINUX_KCONFIG_FILE),)
 481 $(error No kernel configuration file specified, check your BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE setting)
 482 endif
 483 endif
 484
 485 ifeq ($(BR2_LINUX_KERNEL_DTS_SUPPORT):$(strip $(LINUX_DTS_NAME)),y:)
 486 $(error No kernel device tree source specified, check your \
 487         BR2_LINUX_KERNEL_INTREE_DTS_NAME / BR2_LINUX_KERNEL_CUSTOM_DTS_PATH settings)
 488 endif
 489
 490 endif # BR_BUILDING
 491
 492 $(eval $(kconfig-package))
 493
 494 # Support for rebuilding the kernel after the cpio archive has
 495 # been generated.
 496 .PHONY: linux-rebuild-with-initramfs
 497 linux-rebuild-with-initramfs: $(LINUX_DIR)/.stamp_target_installed
 498 linux-rebuild-with-initramfs: $(LINUX_DIR)/.stamp_images_installed
 499 linux-rebuild-with-initramfs: rootfs-cpio
 500 linux-rebuild-with-initramfs:
 501         @$(call MESSAGE,"Rebuilding kernel with initramfs")
 502         # Build the kernel.
 503         $(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(LINUX_DIR) $(LINUX_TARGET_NAME)
 504         $(LINUX_APPEND_DTB)
 505         # Copy the kernel image(s) to its(their) final destination
 506         $(call LINUX_INSTALL_IMAGE,$(BINARIES_DIR))
 507         # If there is a .ub file copy it to the final destination
 508         test ! -f $(LINUX_IMAGE_PATH).ub || cp $(LINUX_IMAGE_PATH).ub $(BINARIES_DIR)