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