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