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_LOCAL),y)
  25 LINUX_SITE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_LOCAL_PATH))
  26 LINUX_SITE_METHOD = local
  27 else ifeq ($(BR2_LINUX_KERNEL_CUSTOM_GIT),y)
  28 LINUX_SITE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_URL))
  29 LINUX_SITE_METHOD = git
  30 else ifeq ($(BR2_LINUX_KERNEL_CUSTOM_HG),y)
  31 LINUX_SITE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_URL))
  32 LINUX_SITE_METHOD = hg
  33 else ifeq ($(BR2_LINUX_KERNEL_CUSTOM_SVN),y)
  34 LINUX_SITE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_URL))
  35 LINUX_SITE_METHOD = svn
  36 else
  37 LINUX_SOURCE = linux-$(LINUX_VERSION).tar.xz
  38 ifeq ($(BR2_LINUX_KERNEL_CUSTOM_VERSION),y)
  39 BR_NO_CHECK_HASH_FOR += $(LINUX_SOURCE)
  40 endif
  41 # In X.Y.Z, get X and Y. We replace dots and dashes by spaces in order
  42 # to use the $(word) function. We support versions such as 4.0, 3.1,
  43 # 2.6.32, 2.6.32-rc1, 3.0-rc6, etc.
  44 ifeq ($(findstring x2.6.,x$(LINUX_VERSION)),x2.6.)
  45 LINUX_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v2.6
  46 else ifeq ($(findstring x3.,x$(LINUX_VERSION)),x3.)
  47 LINUX_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v3.x
  48 else ifeq ($(findstring x4.,x$(LINUX_VERSION)),x4.)
  49 LINUX_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v4.x
  50 endif
  51 # release candidates are in testing/ subdir
  52 ifneq ($(findstring -rc,$(LINUX_VERSION)),)
  53 LINUX_SITE := $(LINUX_SITE)/testing
  54 endif # -rc
  55 endif
  56
  57 LINUX_PATCHES = $(call qstrip,$(BR2_LINUX_KERNEL_PATCH))
  58
  59 # We rely on the generic package infrastructure to download and apply
  60 # remote patches (downloaded from ftp, http or https). For local
  61 # patches, we can't rely on that infrastructure, because there might
  62 # be directories in the patch list (unlike for other packages).
  63 LINUX_PATCH = $(filter ftp://% http://% https://%,$(LINUX_PATCHES))
  64
  65 LINUX_INSTALL_IMAGES = YES
  66 LINUX_DEPENDENCIES += host-kmod
  67
  68 # host tools needed for kernel compression
  69 ifeq ($(BR2_LINUX_KERNEL_LZ4),y)
  70 LINUX_DEPENDENCIES += host-lz4
  71 else ifeq ($(BR2_LINUX_KERNEL_LZMA),y)
  72 LINUX_DEPENDENCIES += host-lzma
  73 else ifeq ($(BR2_LINUX_KERNEL_LZO),y)
  74 LINUX_DEPENDENCIES += host-lzop
  75 else ifeq ($(BR2_LINUX_KERNEL_XZ),y)
  76 LINUX_DEPENDENCIES += host-xz
  77 endif
  78 LINUX_COMPRESSION_OPT_$(BR2_LINUX_KERNEL_GZIP) = CONFIG_KERNEL_GZIP
  79 LINUX_COMPRESSION_OPT_$(BR2_LINUX_KERNEL_LZ4) = CONFIG_KERNEL_LZ4
  80 LINUX_COMPRESSION_OPT_$(BR2_LINUX_KERNEL_LZMA) = CONFIG_KERNEL_LZMA
  81 LINUX_COMPRESSION_OPT_$(BR2_LINUX_KERNEL_LZO) = CONFIG_KERNEL_LZO
  82 LINUX_COMPRESSION_OPT_$(BR2_LINUX_KERNEL_XZ) = CONFIG_KERNEL_XZ
  83
  84 ifeq ($(BR2_LINUX_KERNEL_UBOOT_IMAGE),y)
  85 LINUX_DEPENDENCIES += host-uboot-tools
  86 endif
  87
  88 LINUX_MAKE_FLAGS = \
  89         HOSTCC="$(HOSTCC)" \
  90         HOSTCFLAGS="$(HOSTCFLAGS)" \
  91         ARCH=$(KERNEL_ARCH) \
  92         INSTALL_MOD_PATH=$(TARGET_DIR) \
  93         CROSS_COMPILE="$(TARGET_CROSS)" \
  94         DEPMOD=$(HOST_DIR)/sbin/depmod
  95
  96 LINUX_MAKE_ENV = \
  97         $(TARGET_MAKE_ENV) \
  98         BR_BINARIES_DIR=$(BINARIES_DIR)
  99
 100 # Get the real Linux version, which tells us where kernel modules are
 101 # going to be installed in the target filesystem.
 102 LINUX_VERSION_PROBED = `$(MAKE) $(LINUX_MAKE_FLAGS) -C $(LINUX_DIR) --no-print-directory -s kernelrelease 2>/dev/null`
 103
 104 ifeq ($(BR2_LINUX_KERNEL_USE_INTREE_DTS),y)
 105 KERNEL_DTS_NAME = $(call qstrip,$(BR2_LINUX_KERNEL_INTREE_DTS_NAME))
 106 else ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_DTS),y)
 107 # We keep only the .dts files, so that the user can specify both .dts
 108 # and .dtsi files in BR2_LINUX_KERNEL_CUSTOM_DTS_PATH. Both will be
 109 # copied to arch/<arch>/boot/dts, but only the .dts files will
 110 # actually be generated as .dtb.
 111 KERNEL_DTS_NAME = $(basename $(filter %.dts,$(notdir $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_DTS_PATH)))))
 112 endif
 113
 114 KERNEL_DTBS = $(addsuffix .dtb,$(KERNEL_DTS_NAME))
 115
 116 ifeq ($(BR2_LINUX_KERNEL_IMAGE_TARGET_CUSTOM),y)
 117 LINUX_IMAGE_NAME = $(call qstrip,$(BR2_LINUX_KERNEL_IMAGE_NAME))
 118 LINUX_TARGET_NAME = $(call qstrip,$(BR2_LINUX_KERNEL_IMAGE_TARGET_NAME))
 119 ifeq ($(LINUX_IMAGE_NAME),)
 120 LINUX_IMAGE_NAME = $(LINUX_TARGET_NAME)
 121 endif
 122 else
 123 ifeq ($(BR2_LINUX_KERNEL_UIMAGE),y)
 124 LINUX_IMAGE_NAME = uImage
 125 else ifeq ($(BR2_LINUX_KERNEL_APPENDED_UIMAGE),y)
 126 LINUX_IMAGE_NAME = uImage
 127 else ifeq ($(BR2_LINUX_KERNEL_BZIMAGE),y)
 128 LINUX_IMAGE_NAME = bzImage
 129 else ifeq ($(BR2_LINUX_KERNEL_ZIMAGE),y)
 130 LINUX_IMAGE_NAME = zImage
 131 else ifeq ($(BR2_LINUX_KERNEL_ZIMAGE_EPAPR),y)
 132 LINUX_IMAGE_NAME = zImage.epapr
 133 else ifeq ($(BR2_LINUX_KERNEL_APPENDED_ZIMAGE),y)
 134 LINUX_IMAGE_NAME = zImage
 135 else ifeq ($(BR2_LINUX_KERNEL_CUIMAGE),y)
 136 LINUX_IMAGE_NAME = cuImage.$(KERNEL_DTS_NAME)
 137 else ifeq ($(BR2_LINUX_KERNEL_SIMPLEIMAGE),y)
 138 LINUX_IMAGE_NAME = simpleImage.$(KERNEL_DTS_NAME)
 139 else ifeq ($(BR2_LINUX_KERNEL_IMAGE),y)
 140 LINUX_IMAGE_NAME = Image
 141 else ifeq ($(BR2_LINUX_KERNEL_LINUX_BIN),y)
 142 LINUX_IMAGE_NAME = linux.bin
 143 else ifeq ($(BR2_LINUX_KERNEL_VMLINUX_BIN),y)
 144 LINUX_IMAGE_NAME = vmlinux.bin
 145 else ifeq ($(BR2_LINUX_KERNEL_VMLINUX),y)
 146 LINUX_IMAGE_NAME = vmlinux
 147 else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ),y)
 148 LINUX_IMAGE_NAME = vmlinuz
 149 else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ_BIN),y)
 150 LINUX_IMAGE_NAME = vmlinuz.bin
 151 endif
 152 # The if-else blocks above are all the image types we know of, and all
 153 # come from a Kconfig choice, so we know we have LINUX_IMAGE_NAME set
 154 # to something
 155 LINUX_TARGET_NAME = $(LINUX_IMAGE_NAME)
 156 endif
 157
 158 LINUX_KERNEL_UIMAGE_LOADADDR = $(call qstrip,$(BR2_LINUX_KERNEL_UIMAGE_LOADADDR))
 159 ifneq ($(LINUX_KERNEL_UIMAGE_LOADADDR),)
 160 LINUX_MAKE_FLAGS += LOADADDR="$(LINUX_KERNEL_UIMAGE_LOADADDR)"
 161 endif
 162
 163 # Compute the arch path, since i386 and x86_64 are in arch/x86 and not
 164 # in arch/$(KERNEL_ARCH). Even if the kernel creates symbolic links
 165 # for bzImage, arch/i386 and arch/x86_64 do not exist when copying the
 166 # defconfig file.
 167 ifeq ($(KERNEL_ARCH),i386)
 168 KERNEL_ARCH_PATH = $(LINUX_DIR)/arch/x86
 169 else ifeq ($(KERNEL_ARCH),x86_64)
 170 KERNEL_ARCH_PATH = $(LINUX_DIR)/arch/x86
 171 else
 172 KERNEL_ARCH_PATH = $(LINUX_DIR)/arch/$(KERNEL_ARCH)
 173 endif
 174
 175 ifeq ($(BR2_LINUX_KERNEL_VMLINUX),y)
 176 LINUX_IMAGE_PATH = $(LINUX_DIR)/$(LINUX_IMAGE_NAME)
 177 else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ),y)
 178 LINUX_IMAGE_PATH = $(LINUX_DIR)/$(LINUX_IMAGE_NAME)
 179 else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ_BIN),y)
 180 LINUX_IMAGE_PATH = $(LINUX_DIR)/$(LINUX_IMAGE_NAME)
 181 else
 182 LINUX_IMAGE_PATH = $(KERNEL_ARCH_PATH)/boot/$(LINUX_IMAGE_NAME)
 183 endif # BR2_LINUX_KERNEL_VMLINUX
 184
 185 define LINUX_APPLY_LOCAL_PATCHES
 186         for p in $(filter-out ftp://% http://% https://%,$(LINUX_PATCHES)) ; do \
 187                 if test -d $$p ; then \
 188                         $(APPLY_PATCHES) $(@D) $$p \*.patch || exit 1 ; \
 189                 else \
 190                         $(APPLY_PATCHES) $(@D) `dirname $$p` `basename $$p` || exit 1; \
 191                 fi \
 192         done
 193 endef
 194
 195 LINUX_POST_PATCH_HOOKS += LINUX_APPLY_LOCAL_PATCHES
 196
 197 # Older linux kernels use deprecated perl constructs in timeconst.pl
 198 # that were removed for perl 5.22+ so it breaks on newer distributions
 199 # Try a dry-run patch to see if this applies, if it does go ahead
 200 define LINUX_TRY_PATCH_TIMECONST
 201         @if patch -p1 --dry-run -f -s -d $(@D) <$(LINUX_PKGDIR)/0001-timeconst.pl-Eliminate-Perl-warning.patch.conditional >/dev/null ; then \
 202                 $(APPLY_PATCHES) $(@D) $(LINUX_PKGDIR) 0001-timeconst.pl-Eliminate-Perl-warning.patch.conditional ; \
 203         fi
 204 endef
 205 LINUX_POST_PATCH_HOOKS += LINUX_TRY_PATCH_TIMECONST
 206
 207 ifeq ($(BR2_LINUX_KERNEL_USE_DEFCONFIG),y)
 208 LINUX_KCONFIG_DEFCONFIG = $(call qstrip,$(BR2_LINUX_KERNEL_DEFCONFIG))_defconfig
 209 else ifeq ($(BR2_LINUX_KERNEL_USE_ARCH_DEFAULT_CONFIG),y)
 210 LINUX_KCONFIG_DEFCONFIG = defconfig
 211 else ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG),y)
 212 LINUX_KCONFIG_FILE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE))
 213 endif
 214 LINUX_KCONFIG_FRAGMENT_FILES = $(call qstrip,$(BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES))
 215 LINUX_KCONFIG_EDITORS = menuconfig xconfig gconfig nconfig
 216 LINUX_KCONFIG_OPTS = $(LINUX_MAKE_FLAGS)
 217
 218 # If no package has yet set it, set it from the Kconfig option
 219 LINUX_NEEDS_MODULES ?= $(BR2_LINUX_NEEDS_MODULES)
 220
 221 # Make sure the Linux kernel is built with the right endianness. Not
 222 # all architectures support
 223 # CONFIG_CPU_BIG_ENDIAN/CONFIG_CPU_LITTLE_ENDIAN in Linux, but the
 224 # option will be thrown away and ignored if it doesn't exist.
 225 ifeq ($(BR2_ENDIAN),"BIG")
 226 define LINUX_FIXUP_CONFIG_ENDIANNESS
 227         $(call KCONFIG_ENABLE_OPT,CONFIG_CPU_BIG_ENDIAN,$(@D)/.config)
 228 endef
 229 else
 230 define LINUX_FIXUP_CONFIG_ENDIANNESS
 231         $(call KCONFIG_ENABLE_OPT,CONFIG_CPU_LITTLE_ENDIAN,$(@D)/.config)
 232 endef
 233 endif
 234
 235 define LINUX_KCONFIG_FIXUP_CMDS
 236         $(if $(LINUX_NEEDS_MODULES),
 237                 $(call KCONFIG_ENABLE_OPT,CONFIG_MODULES,$(@D)/.config))
 238         $(call KCONFIG_ENABLE_OPT,$(LINUX_COMPRESSION_OPT_y),$(@D)/.config)
 239         $(foreach opt, $(LINUX_COMPRESSION_OPT_),
 240                 $(call KCONFIG_DISABLE_OPT,$(opt),$(@D)/.config)
 241         )
 242         $(LINUX_FIXUP_CONFIG_ENDIANNESS)
 243         $(if $(BR2_arm)$(BR2_armeb),
 244                 $(call KCONFIG_ENABLE_OPT,CONFIG_AEABI,$(@D)/.config))
 245         $(if $(BR2_TARGET_ROOTFS_CPIO),
 246                 $(call KCONFIG_ENABLE_OPT,CONFIG_BLK_DEV_INITRD,$(@D)/.config))
 247         # As the kernel gets compiled before root filesystems are
 248         # built, we create a fake cpio file. It'll be
 249         # replaced later by the real cpio archive, and the kernel will be
 250         # rebuilt using the linux-rebuild-with-initramfs target.
 251         $(if $(BR2_TARGET_ROOTFS_INITRAMFS),
 252                 touch $(BINARIES_DIR)/rootfs.cpio
 253                 $(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_SOURCE,"$${BR_BINARIES_DIR}/rootfs.cpio",$(@D)/.config)
 254                 $(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_ROOT_UID,0,$(@D)/.config)
 255                 $(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_ROOT_GID,0,$(@D)/.config))
 256         $(if $(BR2_ROOTFS_DEVICE_CREATION_STATIC),,
 257                 $(call KCONFIG_ENABLE_OPT,CONFIG_DEVTMPFS,$(@D)/.config)
 258                 $(call KCONFIG_ENABLE_OPT,CONFIG_DEVTMPFS_MOUNT,$(@D)/.config))
 259         $(if $(BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_EUDEV),
 260                 $(call KCONFIG_ENABLE_OPT,CONFIG_INOTIFY_USER,$(@D)/.config))
 261         $(if $(BR2_PACKAGE_KTAP),
 262                 $(call KCONFIG_ENABLE_OPT,CONFIG_DEBUG_FS,$(@D)/.config)
 263                 $(call KCONFIG_ENABLE_OPT,CONFIG_ENABLE_DEFAULT_TRACERS,$(@D)/.config)
 264                 $(call KCONFIG_ENABLE_OPT,CONFIG_PERF_EVENTS,$(@D)/.config)
 265                 $(call KCONFIG_ENABLE_OPT,CONFIG_FUNCTION_TRACER,$(@D)/.config))
 266         $(if $(BR2_PACKAGE_SYSTEMD),
 267                 $(call KCONFIG_ENABLE_OPT,CONFIG_CGROUPS,$(@D)/.config)
 268                 $(call KCONFIG_ENABLE_OPT,CONFIG_INOTIFY_USER,$(@D)/.config)
 269                 $(call KCONFIG_ENABLE_OPT,CONFIG_FHANDLE,$(@D)/.config)
 270                 $(call KCONFIG_ENABLE_OPT,CONFIG_AUTOFS4_FS,$(@D)/.config)
 271                 $(call KCONFIG_ENABLE_OPT,CONFIG_TMPFS_POSIX_ACL,$(@D)/.config)
 272                 $(call KCONFIG_ENABLE_OPT,CONFIG_TMPFS_POSIX_XATTR,$(@D)/.config))
 273         $(if $(BR2_PACKAGE_SMACK),
 274                 $(call KCONFIG_ENABLE_OPT,CONFIG_SECURITY,$(@D)/.config)
 275                 $(call KCONFIG_ENABLE_OPT,CONFIG_SECURITY_SMACK,$(@D)/.config)
 276                 $(call KCONFIG_ENABLE_OPT,CONFIG_SECURITY_NETWORK,$(@D)/.config))
 277         $(if $(BR2_PACKAGE_IPTABLES),
 278                 $(call KCONFIG_ENABLE_OPT,CONFIG_IP_NF_IPTABLES,$(@D)/.config)
 279                 $(call KCONFIG_ENABLE_OPT,CONFIG_IP_NF_FILTER,$(@D)/.config)
 280                 $(call KCONFIG_ENABLE_OPT,CONFIG_NETFILTER,$(@D)/.config)
 281                 $(call KCONFIG_ENABLE_OPT,CONFIG_NETFILTER_XTABLES,$(@D)/.config))
 282         $(if $(BR2_PACKAGE_XTABLES_ADDONS),
 283                 $(call KCONFIG_ENABLE_OPT,CONFIG_NETFILTER_ADVANCED,$(@D)/.config)
 284                 $(call KCONFIG_ENABLE_OPT,CONFIG_NF_CONNTRACK,$(@D)/.config)
 285                 $(call KCONFIG_ENABLE_OPT,CONFIG_NF_CONNTRACK_MARK,$(@D)/.config))
 286         $(if $(BR2_LINUX_KERNEL_APPENDED_DTB),
 287                 $(call KCONFIG_ENABLE_OPT,CONFIG_ARM_APPENDED_DTB,$(@D)/.config))
 288         $(if $(BR2_PACKAGE_KERNEL_MODULE_IMX_GPU_VIV),
 289                 $(call KCONFIG_DISABLE_OPT,CONFIG_MXC_GPU_VIV,$(@D)/.config))
 290 endef
 291
 292 ifeq ($(BR2_LINUX_KERNEL_DTS_SUPPORT),y)
 293 ifeq ($(BR2_LINUX_KERNEL_DTB_IS_SELF_BUILT),)
 294 define LINUX_BUILD_DTB
 295         $(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(KERNEL_DTBS)
 296 endef
 297 ifeq ($(BR2_LINUX_KERNEL_APPENDED_DTB),)
 298 define LINUX_INSTALL_DTB
 299         # dtbs moved from arch/<ARCH>/boot to arch/<ARCH>/boot/dts since 3.8-rc1
 300         cp $(addprefix \
 301                 $(KERNEL_ARCH_PATH)/boot/$(if $(wildcard \
 302                 $(addprefix $(KERNEL_ARCH_PATH)/boot/dts/,$(KERNEL_DTBS))),dts/),$(KERNEL_DTBS)) \
 303                 $(1)
 304 endef
 305 endif # BR2_LINUX_KERNEL_APPENDED_DTB
 306 endif # BR2_LINUX_KERNEL_DTB_IS_SELF_BUILT
 307 endif # BR2_LINUX_KERNEL_DTS_SUPPORT
 308
 309 ifeq ($(BR2_LINUX_KERNEL_APPENDED_DTB),y)
 310 # dtbs moved from arch/$ARCH/boot to arch/$ARCH/boot/dts since 3.8-rc1
 311 define LINUX_APPEND_DTB
 312         (cd $(KERNEL_ARCH_PATH)/boot; \
 313                 for dtb in $(KERNEL_DTS_NAME); do \
 314                         if test -e $${dtb}.dtb ; then \
 315                                 dtbpath=$${dtb}.dtb ; \
 316                         else \
 317                                 dtbpath=dts/$${dtb}.dtb ; \
 318                         fi ; \
 319                         cat zImage $${dtbpath} > zImage.$${dtb} || exit 1; \
 320                 done)
 321 endef
 322 ifeq ($(BR2_LINUX_KERNEL_APPENDED_UIMAGE),y)
 323 # We need to generate a new u-boot image that takes into
 324 # account the extra-size added by the device tree at the end
 325 # of the image. To do so, we first need to retrieve both load
 326 # address and entry point for the kernel from the already
 327 # generate uboot image before using mkimage -l.
 328 LINUX_APPEND_DTB += ; \
 329         MKIMAGE_ARGS=`$(MKIMAGE) -l $(LINUX_IMAGE_PATH) |\
 330         sed -n -e 's/Image Name:[ ]*\(.*\)/-n \1/p' -e 's/Load Address:/-a/p' -e 's/Entry Point:/-e/p'`; \
 331         for dtb in $(KERNEL_DTS_NAME); do \
 332                 $(MKIMAGE) -A $(MKIMAGE_ARCH) -O linux \
 333                         -T kernel -C none $${MKIMAGE_ARGS} \
 334                         -d $(KERNEL_ARCH_PATH)/boot/zImage.$${dtb} $(LINUX_IMAGE_PATH).$${dtb}; \
 335         done
 336 endif
 337 endif
 338
 339 # Compilation. We make sure the kernel gets rebuilt when the
 340 # configuration has changed.
 341 define LINUX_BUILD_CMDS
 342         $(if $(BR2_LINUX_KERNEL_USE_CUSTOM_DTS),
 343                 cp -f $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_DTS_PATH)) $(KERNEL_ARCH_PATH)/boot/dts/)
 344         $(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(LINUX_TARGET_NAME)
 345         @if grep -q "CONFIG_MODULES=y" $(@D)/.config; then      \
 346                 $(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) modules ;        \
 347         fi
 348         $(LINUX_BUILD_DTB)
 349         $(LINUX_APPEND_DTB)
 350 endef
 351
 352 ifeq ($(BR2_LINUX_KERNEL_APPENDED_DTB),y)
 353 # When a DTB was appended, install the potential several images with
 354 # appended DTBs.
 355 define LINUX_INSTALL_IMAGE
 356         mkdir -p $(1)
 357         cp $(KERNEL_ARCH_PATH)/boot/$(LINUX_IMAGE_NAME).* $(1)
 358 endef
 359 else
 360 # Otherwise, just install the unique image generated by the kernel
 361 # build process.
 362 define LINUX_INSTALL_IMAGE
 363         $(INSTALL) -m 0644 -D $(LINUX_IMAGE_PATH) $(1)/$(LINUX_IMAGE_NAME)
 364 endef
 365 endif
 366
 367 ifeq ($(BR2_LINUX_KERNEL_INSTALL_TARGET),y)
 368 define LINUX_INSTALL_KERNEL_IMAGE_TO_TARGET
 369         $(call LINUX_INSTALL_IMAGE,$(TARGET_DIR)/boot)
 370         $(call LINUX_INSTALL_DTB,$(TARGET_DIR)/boot)
 371 endef
 372 endif
 373
 374 define LINUX_INSTALL_HOST_TOOLS
 375         # Installing dtc (device tree compiler) as host tool, if selected
 376         if grep -q "CONFIG_DTC=y" $(@D)/.config; then   \
 377                 $(INSTALL) -D -m 0755 $(@D)/scripts/dtc/dtc $(HOST_DIR)/usr/bin/linux-dtc ;     \
 378                 if [ ! -e $(HOST_DIR)/usr/bin/dtc ]; then       \
 379                         ln -sf linux-dtc $(HOST_DIR)/usr/bin/dtc ;      \
 380                 fi      \
 381         fi
 382 endef
 383
 384
 385 define LINUX_INSTALL_IMAGES_CMDS
 386         $(call LINUX_INSTALL_IMAGE,$(BINARIES_DIR))
 387         $(call LINUX_INSTALL_DTB,$(BINARIES_DIR))
 388 endef
 389
 390 define LINUX_INSTALL_TARGET_CMDS
 391         $(LINUX_INSTALL_KERNEL_IMAGE_TO_TARGET)
 392         # Install modules and remove symbolic links pointing to build
 393         # directories, not relevant on the target
 394         @if grep -q "CONFIG_MODULES=y" $(@D)/.config; then      \
 395                 $(LINUX_MAKE_ENV) $(MAKE1) $(LINUX_MAKE_FLAGS) -C $(@D) modules_install; \
 396                 rm -f $(TARGET_DIR)/lib/modules/$(LINUX_VERSION_PROBED)/build ;         \
 397                 rm -f $(TARGET_DIR)/lib/modules/$(LINUX_VERSION_PROBED)/source ;        \
 398         fi
 399         $(LINUX_INSTALL_HOST_TOOLS)
 400 endef
 401
 402 # Include all our extensions and tools definitions.
 403 #
 404 # Note: our package infrastructure uses the full-path of the last-scanned
 405 # Makefile to determine what package we're currently defining, using the
 406 # last directory component in the path. As such, including other Makefile,
 407 # like below, before we call one of the *-package macro is usally not
 408 # working.
 409 # However, since the files we include here are in the same directory as
 410 # the current Makefile, we are OK. But this is a hard requirement: files
 411 # included here *must* be in the same directory!
 412 include $(sort $(wildcard linux/linux-ext-*.mk))
 413 include $(sort $(wildcard linux/linux-tool-*.mk))
 414
 415 LINUX_PATCH_DEPENDENCIES += $(foreach ext,$(LINUX_EXTENSIONS),\
 416         $(if $(BR2_LINUX_KERNEL_EXT_$(call UPPERCASE,$(ext))),$(ext)))
 417
 418 LINUX_PRE_PATCH_HOOKS += $(foreach ext,$(LINUX_EXTENSIONS),\
 419         $(if $(BR2_LINUX_KERNEL_EXT_$(call UPPERCASE,$(ext))),\
 420                 $(call UPPERCASE,$(ext))_PREPARE_KERNEL))
 421
 422 # Install Linux kernel tools in the staging directory since some tools
 423 # may install shared libraries and headers (e.g. cpupower). The kernel
 424 # image is NOT installed in the staging directory.
 425 LINUX_INSTALL_STAGING = YES
 426
 427 LINUX_DEPENDENCIES += $(foreach tool,$(LINUX_TOOLS),\
 428         $(if $(BR2_LINUX_KERNEL_TOOL_$(call UPPERCASE,$(tool))),\
 429                 $($(call UPPERCASE,$(tool))_DEPENDENCIES)))
 430
 431 LINUX_POST_BUILD_HOOKS += $(foreach tool,$(LINUX_TOOLS),\
 432         $(if $(BR2_LINUX_KERNEL_TOOL_$(call UPPERCASE,$(tool))),\
 433                 $(call UPPERCASE,$(tool))_BUILD_CMDS))
 434
 435 LINUX_POST_INSTALL_STAGING_HOOKS += $(foreach tool,$(LINUX_TOOLS),\
 436         $(if $(BR2_LINUX_KERNEL_TOOL_$(call UPPERCASE,$(tool))),\
 437                 $(call UPPERCASE,$(tool))_INSTALL_STAGING_CMDS))
 438
 439 LINUX_POST_INSTALL_TARGET_HOOKS += $(foreach tool,$(LINUX_TOOLS),\
 440         $(if $(BR2_LINUX_KERNEL_TOOL_$(call UPPERCASE,$(tool))),\
 441                 $(call UPPERCASE,$(tool))_INSTALL_TARGET_CMDS))
 442
 443 # Checks to give errors that the user can understand
 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