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 ($(BR2_LINUX_KERNEL_LATEST_CIP_VERSION),y)
  33 LINUX_SITE = git://git.kernel.org/pub/scm/linux/kernel/git/bwh/linux-cip.git
  34 else
  35 LINUX_SOURCE = linux-$(LINUX_VERSION).tar.xz
  36 # In X.Y.Z, get X and Y. We replace dots and dashes by spaces in order
  37 # to use the $(word) function. We support versions such as 4.0, 3.1,
  38 # 2.6.32, 2.6.32-rc1, 3.0-rc6, etc.
  39 ifeq ($(findstring x2.6.,x$(LINUX_VERSION)),x2.6.)
  40 LINUX_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v2.6
  41 else ifeq ($(findstring x3.,x$(LINUX_VERSION)),x3.)
  42 LINUX_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v3.x
  43 else ifeq ($(findstring x4.,x$(LINUX_VERSION)),x4.)
  44 LINUX_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v4.x
  45 endif
  46 # release candidates are in testing/ subdir
  47 ifneq ($(findstring -rc,$(LINUX_VERSION)),)
  48 LINUX_SITE := $(LINUX_SITE)/testing
  49 endif # -rc
  50 endif
  51
  52 ifeq ($(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-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_$(BR2_LINUX_KERNEL_XZ) = CONFIG_KERNEL_XZ
  82
  83 # If host-uboot-tools is selected by the user, assume it is needed to
  84 # create a custom image
  85 ifeq ($(BR2_PACKAGE_HOST_UBOOT_TOOLS),y)
  86 LINUX_DEPENDENCIES += host-uboot-tools
  87 endif
  88
  89 ifneq ($(ARCH_XTENSA_OVERLAY_FILE),)
  90 define LINUX_XTENSA_OVERLAY_EXTRACT
  91         $(call arch-xtensa-overlay-extract,$(@D),linux)
  92 endef
  93 LINUX_POST_EXTRACT_HOOKS += LINUX_XTENSA_OVERLAY_EXTRACT
  94 LINUX_EXTRA_DOWNLOADS += $(ARCH_XTENSA_OVERLAY_URL)
  95 endif
  96
  97 LINUX_MAKE_FLAGS = \
  98         HOSTCC="$(HOSTCC)" \
  99         HOSTCFLAGS="$(HOSTCFLAGS)" \
 100         ARCH=$(KERNEL_ARCH) \
 101         INSTALL_MOD_PATH=$(TARGET_DIR) \
 102         CROSS_COMPILE="$(TARGET_CROSS)" \
 103         DEPMOD=$(HOST_DIR)/sbin/depmod
 104
 105 LINUX_MAKE_ENV = \
 106         $(TARGET_MAKE_ENV) \
 107         BR_BINARIES_DIR=$(BINARIES_DIR)
 108
 109 ifeq ($(BR2_REPRODUCIBLE),y)
 110 LINUX_MAKE_ENV += \
 111         KBUILD_BUILD_VERSION=1 \
 112         KBUILD_BUILD_USER=buildroot \
 113         KBUILD_BUILD_HOST=buildroot \
 114         KBUILD_BUILD_TIMESTAMP="$(shell LC_ALL=C date -d @$(SOURCE_DATE_EPOCH))"
 115 endif
 116
 117 # Get the real Linux version, which tells us where kernel modules are
 118 # going to be installed in the target filesystem.
 119 LINUX_VERSION_PROBED = `$(MAKE) $(LINUX_MAKE_FLAGS) -C $(LINUX_DIR) --no-print-directory -s kernelrelease 2>/dev/null`
 120
 121 ifeq ($(BR2_LINUX_KERNEL_USE_INTREE_DTS),y)
 122 KERNEL_DTS_NAME = $(call qstrip,$(BR2_LINUX_KERNEL_INTREE_DTS_NAME))
 123 else ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_DTS),y)
 124 # We keep only the .dts files, so that the user can specify both .dts
 125 # and .dtsi files in BR2_LINUX_KERNEL_CUSTOM_DTS_PATH. Both will be
 126 # copied to arch/<arch>/boot/dts, but only the .dts files will
 127 # actually be generated as .dtb.
 128 KERNEL_DTS_NAME = $(basename $(filter %.dts,$(notdir $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_DTS_PATH)))))
 129 endif
 130
 131 KERNEL_DTBS = $(addsuffix .dtb,$(KERNEL_DTS_NAME))
 132
 133 ifeq ($(BR2_LINUX_KERNEL_IMAGE_TARGET_CUSTOM),y)
 134 LINUX_IMAGE_NAME = $(call qstrip,$(BR2_LINUX_KERNEL_IMAGE_NAME))
 135 LINUX_TARGET_NAME = $(call qstrip,$(BR2_LINUX_KERNEL_IMAGE_TARGET_NAME))
 136 ifeq ($(LINUX_IMAGE_NAME),)
 137 LINUX_IMAGE_NAME = $(LINUX_TARGET_NAME)
 138 endif
 139 else
 140 ifeq ($(BR2_LINUX_KERNEL_UIMAGE),y)
 141 LINUX_IMAGE_NAME = uImage
 142 else ifeq ($(BR2_LINUX_KERNEL_APPENDED_UIMAGE),y)
 143 LINUX_IMAGE_NAME = uImage
 144 else ifeq ($(BR2_LINUX_KERNEL_BZIMAGE),y)
 145 LINUX_IMAGE_NAME = bzImage
 146 else ifeq ($(BR2_LINUX_KERNEL_ZIMAGE),y)
 147 LINUX_IMAGE_NAME = zImage
 148 else ifeq ($(BR2_LINUX_KERNEL_ZIMAGE_EPAPR),y)
 149 LINUX_IMAGE_NAME = zImage.epapr
 150 else ifeq ($(BR2_LINUX_KERNEL_APPENDED_ZIMAGE),y)
 151 LINUX_IMAGE_NAME = zImage
 152 else ifeq ($(BR2_LINUX_KERNEL_CUIMAGE),y)
 153 LINUX_IMAGE_NAME = cuImage.$(KERNEL_DTS_NAME)
 154 else ifeq ($(BR2_LINUX_KERNEL_SIMPLEIMAGE),y)
 155 LINUX_IMAGE_NAME = simpleImage.$(KERNEL_DTS_NAME)
 156 else ifeq ($(BR2_LINUX_KERNEL_IMAGE),y)
 157 LINUX_IMAGE_NAME = Image
 158 else ifeq ($(BR2_LINUX_KERNEL_LINUX_BIN),y)
 159 LINUX_IMAGE_NAME = linux.bin
 160 else ifeq ($(BR2_LINUX_KERNEL_VMLINUX_BIN),y)
 161 LINUX_IMAGE_NAME = vmlinux.bin
 162 else ifeq ($(BR2_LINUX_KERNEL_VMLINUX),y)
 163 LINUX_IMAGE_NAME = vmlinux
 164 else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ),y)
 165 LINUX_IMAGE_NAME = vmlinuz
 166 else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ_BIN),y)
 167 LINUX_IMAGE_NAME = vmlinuz.bin
 168 endif
 169 # The if-else blocks above are all the image types we know of, and all
 170 # come from a Kconfig choice, so we know we have LINUX_IMAGE_NAME set
 171 # to something
 172 LINUX_TARGET_NAME = $(LINUX_IMAGE_NAME)
 173 endif
 174
 175 LINUX_KERNEL_UIMAGE_LOADADDR = $(call qstrip,$(BR2_LINUX_KERNEL_UIMAGE_LOADADDR))
 176 ifneq ($(LINUX_KERNEL_UIMAGE_LOADADDR),)
 177 LINUX_MAKE_FLAGS += LOADADDR="$(LINUX_KERNEL_UIMAGE_LOADADDR)"
 178 endif
 179
 180 # Compute the arch path, since i386 and x86_64 are in arch/x86 and not
 181 # in arch/$(KERNEL_ARCH). Even if the kernel creates symbolic links
 182 # for bzImage, arch/i386 and arch/x86_64 do not exist when copying the
 183 # defconfig file.
 184 ifeq ($(KERNEL_ARCH),i386)
 185 KERNEL_ARCH_PATH = $(LINUX_DIR)/arch/x86
 186 else ifeq ($(KERNEL_ARCH),x86_64)
 187 KERNEL_ARCH_PATH = $(LINUX_DIR)/arch/x86
 188 else
 189 KERNEL_ARCH_PATH = $(LINUX_DIR)/arch/$(KERNEL_ARCH)
 190 endif
 191
 192 ifeq ($(BR2_LINUX_KERNEL_VMLINUX),y)
 193 LINUX_IMAGE_PATH = $(LINUX_DIR)/$(LINUX_IMAGE_NAME)
 194 else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ),y)
 195 LINUX_IMAGE_PATH = $(LINUX_DIR)/$(LINUX_IMAGE_NAME)
 196 else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ_BIN),y)
 197 LINUX_IMAGE_PATH = $(LINUX_DIR)/$(LINUX_IMAGE_NAME)
 198 else
 199 LINUX_IMAGE_PATH = $(KERNEL_ARCH_PATH)/boot/$(LINUX_IMAGE_NAME)
 200 endif # BR2_LINUX_KERNEL_VMLINUX
 201
 202 define LINUX_APPLY_LOCAL_PATCHES
 203         for p in $(filter-out ftp://% http://% https://%,$(LINUX_PATCHES)) ; do \
 204                 if test -d $$p ; then \
 205                         $(APPLY_PATCHES) $(@D) $$p \*.patch || exit 1 ; \
 206                 else \
 207                         $(APPLY_PATCHES) $(@D) `dirname $$p` `basename $$p` || exit 1; \
 208                 fi \
 209         done
 210 endef
 211
 212 LINUX_POST_PATCH_HOOKS += LINUX_APPLY_LOCAL_PATCHES
 213
 214 # Older linux kernels use deprecated perl constructs in timeconst.pl
 215 # that were removed for perl 5.22+ so it breaks on newer distributions
 216 # Try a dry-run patch to see if this applies, if it does go ahead
 217 define LINUX_TRY_PATCH_TIMECONST
 218         @if patch -p1 --dry-run -f -s -d $(@D) <$(LINUX_PKGDIR)/0001-timeconst.pl-Eliminate-Perl-warning.patch.conditional >/dev/null ; then \
 219                 $(APPLY_PATCHES) $(@D) $(LINUX_PKGDIR) 0001-timeconst.pl-Eliminate-Perl-warning.patch.conditional ; \
 220         fi
 221 endef
 222 LINUX_POST_PATCH_HOOKS += LINUX_TRY_PATCH_TIMECONST
 223
 224 ifeq ($(BR2_LINUX_KERNEL_USE_DEFCONFIG),y)
 225 LINUX_KCONFIG_DEFCONFIG = $(call qstrip,$(BR2_LINUX_KERNEL_DEFCONFIG))_defconfig
 226 else ifeq ($(BR2_LINUX_KERNEL_USE_ARCH_DEFAULT_CONFIG),y)
 227 LINUX_KCONFIG_DEFCONFIG = defconfig
 228 else ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG),y)
 229 LINUX_KCONFIG_FILE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE))
 230 endif
 231 LINUX_KCONFIG_FRAGMENT_FILES = $(call qstrip,$(BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES))
 232 LINUX_KCONFIG_EDITORS = menuconfig xconfig gconfig nconfig
 233 LINUX_KCONFIG_OPTS = $(LINUX_MAKE_FLAGS)
 234
 235 # If no package has yet set it, set it from the Kconfig option
 236 LINUX_NEEDS_MODULES ?= $(BR2_LINUX_NEEDS_MODULES)
 237
 238 # Make sure the Linux kernel is built with the right endianness. Not
 239 # all architectures support
 240 # CONFIG_CPU_BIG_ENDIAN/CONFIG_CPU_LITTLE_ENDIAN in Linux, but the
 241 # option will be thrown away and ignored if it doesn't exist.
 242 ifeq ($(BR2_ENDIAN),"BIG")
 243 define LINUX_FIXUP_CONFIG_ENDIANNESS
 244         $(call KCONFIG_ENABLE_OPT,CONFIG_CPU_BIG_ENDIAN,$(@D)/.config)
 245 endef
 246 else
 247 define LINUX_FIXUP_CONFIG_ENDIANNESS
 248         $(call KCONFIG_ENABLE_OPT,CONFIG_CPU_LITTLE_ENDIAN,$(@D)/.config)
 249 endef
 250 endif
 251
 252 define LINUX_KCONFIG_FIXUP_CMDS
 253         $(if $(LINUX_NEEDS_MODULES),
 254                 $(call KCONFIG_ENABLE_OPT,CONFIG_MODULES,$(@D)/.config))
 255         $(call KCONFIG_ENABLE_OPT,$(LINUX_COMPRESSION_OPT_y),$(@D)/.config)
 256         $(foreach opt, $(LINUX_COMPRESSION_OPT_),
 257                 $(call KCONFIG_DISABLE_OPT,$(opt),$(@D)/.config)
 258         )
 259         $(LINUX_FIXUP_CONFIG_ENDIANNESS)
 260         $(if $(BR2_arm)$(BR2_armeb),
 261                 $(call KCONFIG_ENABLE_OPT,CONFIG_AEABI,$(@D)/.config))
 262         $(if $(BR2_TARGET_ROOTFS_CPIO),
 263                 $(call KCONFIG_ENABLE_OPT,CONFIG_BLK_DEV_INITRD,$(@D)/.config))
 264         # As the kernel gets compiled before root filesystems are
 265         # built, we create a fake cpio file. It'll be
 266         # replaced later by the real cpio archive, and the kernel will be
 267         # rebuilt using the linux-rebuild-with-initramfs target.
 268         $(if $(BR2_TARGET_ROOTFS_INITRAMFS),
 269                 touch $(BINARIES_DIR)/rootfs.cpio
 270                 $(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_SOURCE,"$${BR_BINARIES_DIR}/rootfs.cpio",$(@D)/.config)
 271                 $(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_ROOT_UID,0,$(@D)/.config)
 272                 $(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_ROOT_GID,0,$(@D)/.config))
 273         $(if $(BR2_ROOTFS_DEVICE_CREATION_STATIC),,
 274                 $(call KCONFIG_ENABLE_OPT,CONFIG_DEVTMPFS,$(@D)/.config)
 275                 $(call KCONFIG_ENABLE_OPT,CONFIG_DEVTMPFS_MOUNT,$(@D)/.config))
 276         $(if $(BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_EUDEV),
 277                 $(call KCONFIG_ENABLE_OPT,CONFIG_INOTIFY_USER,$(@D)/.config))
 278         $(if $(BR2_PACKAGE_KTAP),
 279                 $(call KCONFIG_ENABLE_OPT,CONFIG_DEBUG_FS,$(@D)/.config)
 280                 $(call KCONFIG_ENABLE_OPT,CONFIG_ENABLE_DEFAULT_TRACERS,$(@D)/.config)
 281                 $(call KCONFIG_ENABLE_OPT,CONFIG_PERF_EVENTS,$(@D)/.config)
 282                 $(call KCONFIG_ENABLE_OPT,CONFIG_FUNCTION_TRACER,$(@D)/.config))
 283         $(if $(BR2_PACKAGE_SYSTEMD),
 284                 $(call KCONFIG_ENABLE_OPT,CONFIG_CGROUPS,$(@D)/.config)
 285                 $(call KCONFIG_ENABLE_OPT,CONFIG_INOTIFY_USER,$(@D)/.config)
 286                 $(call KCONFIG_ENABLE_OPT,CONFIG_FHANDLE,$(@D)/.config)
 287                 $(call KCONFIG_ENABLE_OPT,CONFIG_AUTOFS4_FS,$(@D)/.config)
 288                 $(call KCONFIG_ENABLE_OPT,CONFIG_TMPFS_POSIX_ACL,$(@D)/.config)
 289                 $(call KCONFIG_ENABLE_OPT,CONFIG_TMPFS_XATTR,$(@D)/.config))
 290         $(if $(BR2_PACKAGE_SMACK),
 291                 $(call KCONFIG_ENABLE_OPT,CONFIG_SECURITY,$(@D)/.config)
 292                 $(call KCONFIG_ENABLE_OPT,CONFIG_SECURITY_SMACK,$(@D)/.config)
 293                 $(call KCONFIG_ENABLE_OPT,CONFIG_SECURITY_NETWORK,$(@D)/.config))
 294         $(if $(BR2_PACKAGE_IPTABLES),
 295                 $(call KCONFIG_ENABLE_OPT,CONFIG_IP_NF_IPTABLES,$(@D)/.config)
 296                 $(call KCONFIG_ENABLE_OPT,CONFIG_IP_NF_FILTER,$(@D)/.config)
 297                 $(call KCONFIG_ENABLE_OPT,CONFIG_NETFILTER,$(@D)/.config)
 298                 $(call KCONFIG_ENABLE_OPT,CONFIG_NETFILTER_XTABLES,$(@D)/.config))
 299         $(if $(BR2_PACKAGE_XTABLES_ADDONS),
 300                 $(call KCONFIG_ENABLE_OPT,CONFIG_NETFILTER_ADVANCED,$(@D)/.config)
 301                 $(call KCONFIG_ENABLE_OPT,CONFIG_NF_CONNTRACK,$(@D)/.config)
 302                 $(call KCONFIG_ENABLE_OPT,CONFIG_NF_CONNTRACK_MARK,$(@D)/.config))
 303         $(if $(BR2_LINUX_KERNEL_APPENDED_DTB),
 304                 $(call KCONFIG_ENABLE_OPT,CONFIG_ARM_APPENDED_DTB,$(@D)/.config))
 305         $(if $(BR2_PACKAGE_KERNEL_MODULE_IMX_GPU_VIV),
 306                 $(call KCONFIG_DISABLE_OPT,CONFIG_MXC_GPU_VIV,$(@D)/.config))
 307 endef
 308
 309 ifeq ($(BR2_LINUX_KERNEL_DTS_SUPPORT),y)
 310 ifeq ($(BR2_LINUX_KERNEL_DTB_IS_SELF_BUILT),)
 311 define LINUX_BUILD_DTB
 312         $(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(KERNEL_DTBS)
 313 endef
 314 ifeq ($(BR2_LINUX_KERNEL_APPENDED_DTB),)
 315 define LINUX_INSTALL_DTB
 316         # dtbs moved from arch/<ARCH>/boot to arch/<ARCH>/boot/dts since 3.8-rc1
 317         cp $(addprefix \
 318                 $(KERNEL_ARCH_PATH)/boot/$(if $(wildcard \
 319                 $(addprefix $(KERNEL_ARCH_PATH)/boot/dts/,$(KERNEL_DTBS))),dts/),$(KERNEL_DTBS)) \
 320                 $(1)
 321 endef
 322 endif # BR2_LINUX_KERNEL_APPENDED_DTB
 323 endif # BR2_LINUX_KERNEL_DTB_IS_SELF_BUILT
 324 endif # BR2_LINUX_KERNEL_DTS_SUPPORT
 325
 326 ifeq ($(BR2_LINUX_KERNEL_APPENDED_DTB),y)
 327 # dtbs moved from arch/$ARCH/boot to arch/$ARCH/boot/dts since 3.8-rc1
 328 define LINUX_APPEND_DTB
 329         (cd $(KERNEL_ARCH_PATH)/boot; \
 330                 for dtb in $(KERNEL_DTS_NAME); do \
 331                         if test -e $${dtb}.dtb ; then \
 332                                 dtbpath=$${dtb}.dtb ; \
 333                         else \
 334                                 dtbpath=dts/$${dtb}.dtb ; \
 335                         fi ; \
 336                         cat zImage $${dtbpath} > zImage.$${dtb} || exit 1; \
 337                 done)
 338 endef
 339 ifeq ($(BR2_LINUX_KERNEL_APPENDED_UIMAGE),y)
 340 # We need to generate a new u-boot image that takes into
 341 # account the extra-size added by the device tree at the end
 342 # of the image. To do so, we first need to retrieve both load
 343 # address and entry point for the kernel from the already
 344 # generate uboot image before using mkimage -l.
 345 LINUX_APPEND_DTB += ; \
 346         MKIMAGE_ARGS=`$(MKIMAGE) -l $(LINUX_IMAGE_PATH) |\
 347         sed -n -e 's/Image Name:[ ]*\(.*\)/-n \1/p' -e 's/Load Address:/-a/p' -e 's/Entry Point:/-e/p'`; \
 348         for dtb in $(KERNEL_DTS_NAME); do \
 349                 $(MKIMAGE) -A $(MKIMAGE_ARCH) -O linux \
 350                         -T kernel -C none $${MKIMAGE_ARGS} \
 351                         -d $(KERNEL_ARCH_PATH)/boot/zImage.$${dtb} $(LINUX_IMAGE_PATH).$${dtb}; \
 352         done
 353 endif
 354 endif
 355
 356 # Compilation. We make sure the kernel gets rebuilt when the
 357 # configuration has changed.
 358 define LINUX_BUILD_CMDS
 359         $(if $(BR2_LINUX_KERNEL_USE_CUSTOM_DTS),
 360                 cp -f $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_DTS_PATH)) $(KERNEL_ARCH_PATH)/boot/dts/)
 361         $(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(LINUX_TARGET_NAME)
 362         @if grep -q "CONFIG_MODULES=y" $(@D)/.config; then      \
 363                 $(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) modules ;        \
 364         fi
 365         $(LINUX_BUILD_DTB)
 366         $(LINUX_APPEND_DTB)
 367 endef
 368
 369 ifeq ($(BR2_LINUX_KERNEL_APPENDED_DTB),y)
 370 # When a DTB was appended, install the potential several images with
 371 # appended DTBs.
 372 define LINUX_INSTALL_IMAGE
 373         mkdir -p $(1)
 374         cp $(KERNEL_ARCH_PATH)/boot/$(LINUX_IMAGE_NAME).* $(1)
 375 endef
 376 else
 377 # Otherwise, just install the unique image generated by the kernel
 378 # build process.
 379 define LINUX_INSTALL_IMAGE
 380         $(INSTALL) -m 0644 -D $(LINUX_IMAGE_PATH) $(1)/$(LINUX_IMAGE_NAME)
 381 endef
 382 endif
 383
 384 ifeq ($(BR2_LINUX_KERNEL_INSTALL_TARGET),y)
 385 define LINUX_INSTALL_KERNEL_IMAGE_TO_TARGET
 386         $(call LINUX_INSTALL_IMAGE,$(TARGET_DIR)/boot)
 387         $(call LINUX_INSTALL_DTB,$(TARGET_DIR)/boot)
 388 endef
 389 endif
 390
 391 define LINUX_INSTALL_HOST_TOOLS
 392         # Installing dtc (device tree compiler) as host tool, if selected
 393         if grep -q "CONFIG_DTC=y" $(@D)/.config; then   \
 394                 $(INSTALL) -D -m 0755 $(@D)/scripts/dtc/dtc $(HOST_DIR)/bin/linux-dtc ; \
 395                 if [ ! -e $(HOST_DIR)/bin/dtc ]; then   \
 396                         ln -sf linux-dtc $(HOST_DIR)/bin/dtc ;  \
 397                 fi      \
 398         fi
 399 endef
 400
 401
 402 define LINUX_INSTALL_IMAGES_CMDS
 403         $(call LINUX_INSTALL_IMAGE,$(BINARIES_DIR))
 404         $(call LINUX_INSTALL_DTB,$(BINARIES_DIR))
 405 endef
 406
 407 ifeq ($(BR2_STRIP_strip),y)
 408 LINUX_MAKE_FLAGS += INSTALL_MOD_STRIP=1
 409 endif
 410
 411 define LINUX_INSTALL_TARGET_CMDS
 412         $(LINUX_INSTALL_KERNEL_IMAGE_TO_TARGET)
 413         # Install modules and remove symbolic links pointing to build
 414         # directories, not relevant on the target
 415         @if grep -q "CONFIG_MODULES=y" $(@D)/.config; then      \
 416                 $(LINUX_MAKE_ENV) $(MAKE1) $(LINUX_MAKE_FLAGS) -C $(@D) modules_install; \
 417                 rm -f $(TARGET_DIR)/lib/modules/$(LINUX_VERSION_PROBED)/build ;         \
 418                 rm -f $(TARGET_DIR)/lib/modules/$(LINUX_VERSION_PROBED)/source ;        \
 419         fi
 420         $(LINUX_INSTALL_HOST_TOOLS)
 421 endef
 422
 423 # Include all our extensions.
 424 #
 425 # Note: our package infrastructure uses the full-path of the last-scanned
 426 # Makefile to determine what package we're currently defining, using the
 427 # last directory component in the path. As such, including other Makefile,
 428 # like below, before we call one of the *-package macro is usally not
 429 # working.
 430 # However, since the files we include here are in the same directory as
 431 # the current Makefile, we are OK. But this is a hard requirement: files
 432 # included here *must* be in the same directory!
 433 include $(sort $(wildcard linux/linux-ext-*.mk))
 434
 435 LINUX_PATCH_DEPENDENCIES += $(foreach ext,$(LINUX_EXTENSIONS),\
 436         $(if $(BR2_LINUX_KERNEL_EXT_$(call UPPERCASE,$(ext))),$(ext)))
 437
 438 LINUX_PRE_PATCH_HOOKS += $(foreach ext,$(LINUX_EXTENSIONS),\
 439         $(if $(BR2_LINUX_KERNEL_EXT_$(call UPPERCASE,$(ext))),\
 440                 $(call UPPERCASE,$(ext))_PREPARE_KERNEL))
 441
 442 # Checks to give errors that the user can understand
 443
 444 # When a custom repository has been set, check for the repository version
 445 ifeq ($(BR2_LINUX_KERNEL_CUSTOM_SVN)$(BR2_LINUX_KERNEL_CUSTOM_GIT)$(BR2_LINUX_KERNEL_CUSTOM_HG),y)
 446 ifeq ($(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION)),)
 447 $(error No custom repository version set. Check your BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION setting)
 448 endif
 449 ifeq ($(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_URL)),)
 450 $(error No custom repo URL set. Check your BR2_LINUX_KERNEL_CUSTOM_REPO_URL setting)
 451 endif
 452 endif
 453
 454 ifeq ($(BR_BUILDING),y)
 455
 456 ifeq ($(BR2_LINUX_KERNEL_USE_DEFCONFIG),y)
 457 # We must use the user-supplied kconfig value, because
 458 # LINUX_KCONFIG_DEFCONFIG will at least contain the
 459 # trailing _defconfig
 460 ifeq ($(call qstrip,$(BR2_LINUX_KERNEL_DEFCONFIG)),)
 461 $(error No kernel defconfig name specified, check your BR2_LINUX_KERNEL_DEFCONFIG setting)
 462 endif
 463 endif
 464
 465 ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG),y)
 466 ifeq ($(LINUX_KCONFIG_FILE),)
 467 $(error No kernel configuration file specified, check your BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE setting)
 468 endif
 469 endif
 470
 471 ifeq ($(BR2_LINUX_KERNEL_DTS_SUPPORT)$(KERNEL_DTS_NAME),y)
 472 $(error No kernel device tree source specified, check your \
 473 BR2_LINUX_KERNEL_USE_INTREE_DTS / BR2_LINUX_KERNEL_USE_CUSTOM_DTS settings)
 474 endif
 475
 476 endif # BR_BUILDING
 477
 478 $(eval $(kconfig-package))
 479
 480 # Support for rebuilding the kernel after the cpio archive has
 481 # been generated in $(BINARIES_DIR)/rootfs.cpio.
 482 $(LINUX_DIR)/.stamp_initramfs_rebuilt: $(LINUX_DIR)/.stamp_target_installed $(LINUX_DIR)/.stamp_images_installed $(BINARIES_DIR)/rootfs.cpio
 483         @$(call MESSAGE,"Rebuilding kernel with initramfs")
 484         # Build the kernel.
 485         $(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(LINUX_TARGET_NAME)
 486         $(LINUX_APPEND_DTB)
 487         # Copy the kernel image(s) to its(their) final destination
 488         $(call LINUX_INSTALL_IMAGE,$(BINARIES_DIR))
 489         # If there is a .ub file copy it to the final destination
 490         test ! -f $(LINUX_IMAGE_PATH).ub || cp $(LINUX_IMAGE_PATH).ub $(BINARIES_DIR)
 491         $(Q)touch $@
 492
 493 # The initramfs building code must make sure this target gets called
 494 # after it generated the initramfs list of files.
 495 linux-rebuild-with-initramfs: $(LINUX_DIR)/.stamp_initramfs_rebuilt