linux.mk 19 KB

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  1. ################################################################################
  2. #
  3. # Linux kernel target
  4. #
  5. ################################################################################
  6. LINUX_VERSION = $(call qstrip,$(BR2_LINUX_KERNEL_VERSION))
  7. LINUX_LICENSE = GPLv2
  8. LINUX_LICENSE_FILES = COPYING
  9. define LINUX_HELP_CMDS
  10. @echo ' linux-menuconfig - Run Linux kernel menuconfig'
  11. @echo ' linux-savedefconfig - Run Linux kernel savedefconfig'
  12. @echo ' linux-update-defconfig - Save the Linux configuration to the path specified'
  13. @echo ' by BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE'
  14. endef
  15. # Compute LINUX_SOURCE and LINUX_SITE from the configuration
  16. ifeq ($(BR2_LINUX_KERNEL_CUSTOM_TARBALL),y)
  17. LINUX_TARBALL = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_TARBALL_LOCATION))
  18. LINUX_SITE = $(patsubst %/,%,$(dir $(LINUX_TARBALL)))
  19. LINUX_SOURCE = $(notdir $(LINUX_TARBALL))
  20. BR_NO_CHECK_HASH_FOR += $(LINUX_SOURCE)
  21. else ifeq ($(BR2_LINUX_KERNEL_CUSTOM_GIT),y)
  22. LINUX_SITE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_URL))
  23. LINUX_SITE_METHOD = git
  24. else ifeq ($(BR2_LINUX_KERNEL_CUSTOM_HG),y)
  25. LINUX_SITE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_URL))
  26. LINUX_SITE_METHOD = hg
  27. else ifeq ($(BR2_LINUX_KERNEL_CUSTOM_SVN),y)
  28. LINUX_SITE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_URL))
  29. LINUX_SITE_METHOD = svn
  30. else
  31. LINUX_SOURCE = linux-$(LINUX_VERSION).tar.xz
  32. ifeq ($(BR2_LINUX_KERNEL_CUSTOM_VERSION),y)
  33. BR_NO_CHECK_HASH_FOR += $(LINUX_SOURCE)
  34. endif
  35. # In X.Y.Z, get X and Y. We replace dots and dashes by spaces in order
  36. # to use the $(word) function. We support versions such as 4.0, 3.1,
  37. # 2.6.32, 2.6.32-rc1, 3.0-rc6, etc.
  38. ifeq ($(findstring x2.6.,x$(LINUX_VERSION)),x2.6.)
  39. LINUX_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v2.6
  40. else ifeq ($(findstring x3.,x$(LINUX_VERSION)),x3.)
  41. LINUX_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v3.x
  42. else ifeq ($(findstring x4.,x$(LINUX_VERSION)),x4.)
  43. LINUX_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v4.x
  44. endif
  45. # release candidates are in testing/ subdir
  46. ifneq ($(findstring -rc,$(LINUX_VERSION)),)
  47. LINUX_SITE := $(LINUX_SITE)/testing
  48. endif # -rc
  49. endif
  50. LINUX_PATCHES = $(call qstrip,$(BR2_LINUX_KERNEL_PATCH))
  51. # We rely on the generic package infrastructure to download and apply
  52. # remote patches (downloaded from ftp, http or https). For local
  53. # patches, we can't rely on that infrastructure, because there might
  54. # be directories in the patch list (unlike for other packages).
  55. LINUX_PATCH = $(filter ftp://% http://% https://%,$(LINUX_PATCHES))
  56. LINUX_INSTALL_IMAGES = YES
  57. LINUX_DEPENDENCIES += host-kmod
  58. # host tools needed for kernel compression
  59. ifeq ($(BR2_LINUX_KERNEL_LZ4),y)
  60. LINUX_DEPENDENCIES += host-lz4
  61. else ifeq ($(BR2_LINUX_KERNEL_LZMA),y)
  62. LINUX_DEPENDENCIES += host-lzma
  63. else ifeq ($(BR2_LINUX_KERNEL_LZO),y)
  64. LINUX_DEPENDENCIES += host-lzop
  65. else ifeq ($(BR2_LINUX_KERNEL_XZ),y)
  66. LINUX_DEPENDENCIES += host-xz
  67. endif
  68. LINUX_COMPRESSION_OPT_$(BR2_LINUX_KERNEL_GZIP) = CONFIG_KERNEL_GZIP
  69. LINUX_COMPRESSION_OPT_$(BR2_LINUX_KERNEL_LZ4) = CONFIG_KERNEL_LZ4
  70. LINUX_COMPRESSION_OPT_$(BR2_LINUX_KERNEL_LZMA) = CONFIG_KERNEL_LZMA
  71. LINUX_COMPRESSION_OPT_$(BR2_LINUX_KERNEL_LZO) = CONFIG_KERNEL_LZO
  72. LINUX_COMPRESSION_OPT_$(BR2_LINUX_KERNEL_XZ) = CONFIG_KERNEL_XZ
  73. ifeq ($(BR2_LINUX_KERNEL_UBOOT_IMAGE),y)
  74. LINUX_DEPENDENCIES += host-uboot-tools
  75. endif
  76. LINUX_MAKE_FLAGS = \
  77. HOSTCC="$(HOSTCC)" \
  78. HOSTCFLAGS="$(HOSTCFLAGS)" \
  79. ARCH=$(KERNEL_ARCH) \
  80. INSTALL_MOD_PATH=$(TARGET_DIR) \
  81. CROSS_COMPILE="$(TARGET_CROSS)" \
  82. DEPMOD=$(HOST_DIR)/sbin/depmod
  83. LINUX_MAKE_ENV = \
  84. $(TARGET_MAKE_ENV) \
  85. BR_BINARIES_DIR=$(BINARIES_DIR)
  86. ifeq ($(BR2_REPRODUCIBLE),y)
  87. LINUX_MAKE_ENV += \
  88. KBUILD_BUILD_VERSION=1 \
  89. KBUILD_BUILD_USER=buildroot \
  90. KBUILD_BUILD_HOST=buildroot \
  91. KBUILD_BUILD_TIMESTAMP="$(shell LC_ALL=C date -d @$(SOURCE_DATE_EPOCH))"
  92. endif
  93. # Get the real Linux version, which tells us where kernel modules are
  94. # going to be installed in the target filesystem.
  95. LINUX_VERSION_PROBED = `$(MAKE) $(LINUX_MAKE_FLAGS) -C $(LINUX_DIR) --no-print-directory -s kernelrelease 2>/dev/null`
  96. ifeq ($(BR2_LINUX_KERNEL_USE_INTREE_DTS),y)
  97. KERNEL_DTS_NAME = $(call qstrip,$(BR2_LINUX_KERNEL_INTREE_DTS_NAME))
  98. else ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_DTS),y)
  99. # We keep only the .dts files, so that the user can specify both .dts
  100. # and .dtsi files in BR2_LINUX_KERNEL_CUSTOM_DTS_PATH. Both will be
  101. # copied to arch/<arch>/boot/dts, but only the .dts files will
  102. # actually be generated as .dtb.
  103. KERNEL_DTS_NAME = $(basename $(filter %.dts,$(notdir $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_DTS_PATH)))))
  104. endif
  105. KERNEL_DTBS = $(addsuffix .dtb,$(KERNEL_DTS_NAME))
  106. ifeq ($(BR2_LINUX_KERNEL_IMAGE_TARGET_CUSTOM),y)
  107. LINUX_IMAGE_NAME = $(call qstrip,$(BR2_LINUX_KERNEL_IMAGE_NAME))
  108. LINUX_TARGET_NAME = $(call qstrip,$(BR2_LINUX_KERNEL_IMAGE_TARGET_NAME))
  109. ifeq ($(LINUX_IMAGE_NAME),)
  110. LINUX_IMAGE_NAME = $(LINUX_TARGET_NAME)
  111. endif
  112. else
  113. ifeq ($(BR2_LINUX_KERNEL_UIMAGE),y)
  114. LINUX_IMAGE_NAME = uImage
  115. else ifeq ($(BR2_LINUX_KERNEL_APPENDED_UIMAGE),y)
  116. LINUX_IMAGE_NAME = uImage
  117. else ifeq ($(BR2_LINUX_KERNEL_BZIMAGE),y)
  118. LINUX_IMAGE_NAME = bzImage
  119. else ifeq ($(BR2_LINUX_KERNEL_ZIMAGE),y)
  120. LINUX_IMAGE_NAME = zImage
  121. else ifeq ($(BR2_LINUX_KERNEL_ZIMAGE_EPAPR),y)
  122. LINUX_IMAGE_NAME = zImage.epapr
  123. else ifeq ($(BR2_LINUX_KERNEL_APPENDED_ZIMAGE),y)
  124. LINUX_IMAGE_NAME = zImage
  125. else ifeq ($(BR2_LINUX_KERNEL_CUIMAGE),y)
  126. LINUX_IMAGE_NAME = cuImage.$(KERNEL_DTS_NAME)
  127. else ifeq ($(BR2_LINUX_KERNEL_SIMPLEIMAGE),y)
  128. LINUX_IMAGE_NAME = simpleImage.$(KERNEL_DTS_NAME)
  129. else ifeq ($(BR2_LINUX_KERNEL_IMAGE),y)
  130. LINUX_IMAGE_NAME = Image
  131. else ifeq ($(BR2_LINUX_KERNEL_LINUX_BIN),y)
  132. LINUX_IMAGE_NAME = linux.bin
  133. else ifeq ($(BR2_LINUX_KERNEL_VMLINUX_BIN),y)
  134. LINUX_IMAGE_NAME = vmlinux.bin
  135. else ifeq ($(BR2_LINUX_KERNEL_VMLINUX),y)
  136. LINUX_IMAGE_NAME = vmlinux
  137. else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ),y)
  138. LINUX_IMAGE_NAME = vmlinuz
  139. else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ_BIN),y)
  140. LINUX_IMAGE_NAME = vmlinuz.bin
  141. endif
  142. # The if-else blocks above are all the image types we know of, and all
  143. # come from a Kconfig choice, so we know we have LINUX_IMAGE_NAME set
  144. # to something
  145. LINUX_TARGET_NAME = $(LINUX_IMAGE_NAME)
  146. endif
  147. LINUX_KERNEL_UIMAGE_LOADADDR = $(call qstrip,$(BR2_LINUX_KERNEL_UIMAGE_LOADADDR))
  148. ifneq ($(LINUX_KERNEL_UIMAGE_LOADADDR),)
  149. LINUX_MAKE_FLAGS += LOADADDR="$(LINUX_KERNEL_UIMAGE_LOADADDR)"
  150. endif
  151. # Compute the arch path, since i386 and x86_64 are in arch/x86 and not
  152. # in arch/$(KERNEL_ARCH). Even if the kernel creates symbolic links
  153. # for bzImage, arch/i386 and arch/x86_64 do not exist when copying the
  154. # defconfig file.
  155. ifeq ($(KERNEL_ARCH),i386)
  156. KERNEL_ARCH_PATH = $(LINUX_DIR)/arch/x86
  157. else ifeq ($(KERNEL_ARCH),x86_64)
  158. KERNEL_ARCH_PATH = $(LINUX_DIR)/arch/x86
  159. else
  160. KERNEL_ARCH_PATH = $(LINUX_DIR)/arch/$(KERNEL_ARCH)
  161. endif
  162. ifeq ($(BR2_LINUX_KERNEL_VMLINUX),y)
  163. LINUX_IMAGE_PATH = $(LINUX_DIR)/$(LINUX_IMAGE_NAME)
  164. else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ),y)
  165. LINUX_IMAGE_PATH = $(LINUX_DIR)/$(LINUX_IMAGE_NAME)
  166. else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ_BIN),y)
  167. LINUX_IMAGE_PATH = $(LINUX_DIR)/$(LINUX_IMAGE_NAME)
  168. else
  169. LINUX_IMAGE_PATH = $(KERNEL_ARCH_PATH)/boot/$(LINUX_IMAGE_NAME)
  170. endif # BR2_LINUX_KERNEL_VMLINUX
  171. define LINUX_APPLY_LOCAL_PATCHES
  172. for p in $(filter-out ftp://% http://% https://%,$(LINUX_PATCHES)) ; do \
  173. if test -d $$p ; then \
  174. $(APPLY_PATCHES) $(@D) $$p \*.patch || exit 1 ; \
  175. else \
  176. $(APPLY_PATCHES) $(@D) `dirname $$p` `basename $$p` || exit 1; \
  177. fi \
  178. done
  179. endef
  180. LINUX_POST_PATCH_HOOKS += LINUX_APPLY_LOCAL_PATCHES
  181. # Older linux kernels use deprecated perl constructs in timeconst.pl
  182. # that were removed for perl 5.22+ so it breaks on newer distributions
  183. # Try a dry-run patch to see if this applies, if it does go ahead
  184. define LINUX_TRY_PATCH_TIMECONST
  185. @if patch -p1 --dry-run -f -s -d $(@D) <$(LINUX_PKGDIR)/0001-timeconst.pl-Eliminate-Perl-warning.patch.conditional >/dev/null ; then \
  186. $(APPLY_PATCHES) $(@D) $(LINUX_PKGDIR) 0001-timeconst.pl-Eliminate-Perl-warning.patch.conditional ; \
  187. fi
  188. endef
  189. LINUX_POST_PATCH_HOOKS += LINUX_TRY_PATCH_TIMECONST
  190. ifeq ($(BR2_LINUX_KERNEL_USE_DEFCONFIG),y)
  191. LINUX_KCONFIG_DEFCONFIG = $(call qstrip,$(BR2_LINUX_KERNEL_DEFCONFIG))_defconfig
  192. else ifeq ($(BR2_LINUX_KERNEL_USE_ARCH_DEFAULT_CONFIG),y)
  193. LINUX_KCONFIG_DEFCONFIG = defconfig
  194. else ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG),y)
  195. LINUX_KCONFIG_FILE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE))
  196. endif
  197. LINUX_KCONFIG_FRAGMENT_FILES = $(call qstrip,$(BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES))
  198. LINUX_KCONFIG_EDITORS = menuconfig xconfig gconfig nconfig
  199. LINUX_KCONFIG_OPTS = $(LINUX_MAKE_FLAGS)
  200. # If no package has yet set it, set it from the Kconfig option
  201. LINUX_NEEDS_MODULES ?= $(BR2_LINUX_NEEDS_MODULES)
  202. # Make sure the Linux kernel is built with the right endianness. Not
  203. # all architectures support
  204. # CONFIG_CPU_BIG_ENDIAN/CONFIG_CPU_LITTLE_ENDIAN in Linux, but the
  205. # option will be thrown away and ignored if it doesn't exist.
  206. ifeq ($(BR2_ENDIAN),"BIG")
  207. define LINUX_FIXUP_CONFIG_ENDIANNESS
  208. $(call KCONFIG_ENABLE_OPT,CONFIG_CPU_BIG_ENDIAN,$(@D)/.config)
  209. endef
  210. else
  211. define LINUX_FIXUP_CONFIG_ENDIANNESS
  212. $(call KCONFIG_ENABLE_OPT,CONFIG_CPU_LITTLE_ENDIAN,$(@D)/.config)
  213. endef
  214. endif
  215. define LINUX_KCONFIG_FIXUP_CMDS
  216. $(if $(LINUX_NEEDS_MODULES),
  217. $(call KCONFIG_ENABLE_OPT,CONFIG_MODULES,$(@D)/.config))
  218. $(call KCONFIG_ENABLE_OPT,$(LINUX_COMPRESSION_OPT_y),$(@D)/.config)
  219. $(foreach opt, $(LINUX_COMPRESSION_OPT_),
  220. $(call KCONFIG_DISABLE_OPT,$(opt),$(@D)/.config)
  221. )
  222. $(LINUX_FIXUP_CONFIG_ENDIANNESS)
  223. $(if $(BR2_arm)$(BR2_armeb),
  224. $(call KCONFIG_ENABLE_OPT,CONFIG_AEABI,$(@D)/.config))
  225. $(if $(BR2_TARGET_ROOTFS_CPIO),
  226. $(call KCONFIG_ENABLE_OPT,CONFIG_BLK_DEV_INITRD,$(@D)/.config))
  227. # As the kernel gets compiled before root filesystems are
  228. # built, we create a fake cpio file. It'll be
  229. # replaced later by the real cpio archive, and the kernel will be
  230. # rebuilt using the linux-rebuild-with-initramfs target.
  231. $(if $(BR2_TARGET_ROOTFS_INITRAMFS),
  232. touch $(BINARIES_DIR)/rootfs.cpio
  233. $(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_SOURCE,"$${BR_BINARIES_DIR}/rootfs.cpio",$(@D)/.config)
  234. $(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_ROOT_UID,0,$(@D)/.config)
  235. $(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_ROOT_GID,0,$(@D)/.config))
  236. $(if $(BR2_ROOTFS_DEVICE_CREATION_STATIC),,
  237. $(call KCONFIG_ENABLE_OPT,CONFIG_DEVTMPFS,$(@D)/.config)
  238. $(call KCONFIG_ENABLE_OPT,CONFIG_DEVTMPFS_MOUNT,$(@D)/.config))
  239. $(if $(BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_EUDEV),
  240. $(call KCONFIG_ENABLE_OPT,CONFIG_INOTIFY_USER,$(@D)/.config))
  241. $(if $(BR2_PACKAGE_KTAP),
  242. $(call KCONFIG_ENABLE_OPT,CONFIG_DEBUG_FS,$(@D)/.config)
  243. $(call KCONFIG_ENABLE_OPT,CONFIG_ENABLE_DEFAULT_TRACERS,$(@D)/.config)
  244. $(call KCONFIG_ENABLE_OPT,CONFIG_PERF_EVENTS,$(@D)/.config)
  245. $(call KCONFIG_ENABLE_OPT,CONFIG_FUNCTION_TRACER,$(@D)/.config))
  246. $(if $(BR2_PACKAGE_SYSTEMD),
  247. $(call KCONFIG_ENABLE_OPT,CONFIG_CGROUPS,$(@D)/.config)
  248. $(call KCONFIG_ENABLE_OPT,CONFIG_INOTIFY_USER,$(@D)/.config)
  249. $(call KCONFIG_ENABLE_OPT,CONFIG_FHANDLE,$(@D)/.config)
  250. $(call KCONFIG_ENABLE_OPT,CONFIG_AUTOFS4_FS,$(@D)/.config)
  251. $(call KCONFIG_ENABLE_OPT,CONFIG_TMPFS_POSIX_ACL,$(@D)/.config)
  252. $(call KCONFIG_ENABLE_OPT,CONFIG_TMPFS_XATTR,$(@D)/.config))
  253. $(if $(BR2_PACKAGE_SMACK),
  254. $(call KCONFIG_ENABLE_OPT,CONFIG_SECURITY,$(@D)/.config)
  255. $(call KCONFIG_ENABLE_OPT,CONFIG_SECURITY_SMACK,$(@D)/.config)
  256. $(call KCONFIG_ENABLE_OPT,CONFIG_SECURITY_NETWORK,$(@D)/.config))
  257. $(if $(BR2_PACKAGE_IPTABLES),
  258. $(call KCONFIG_ENABLE_OPT,CONFIG_IP_NF_IPTABLES,$(@D)/.config)
  259. $(call KCONFIG_ENABLE_OPT,CONFIG_IP_NF_FILTER,$(@D)/.config)
  260. $(call KCONFIG_ENABLE_OPT,CONFIG_NETFILTER,$(@D)/.config)
  261. $(call KCONFIG_ENABLE_OPT,CONFIG_NETFILTER_XTABLES,$(@D)/.config))
  262. $(if $(BR2_PACKAGE_XTABLES_ADDONS),
  263. $(call KCONFIG_ENABLE_OPT,CONFIG_NETFILTER_ADVANCED,$(@D)/.config)
  264. $(call KCONFIG_ENABLE_OPT,CONFIG_NF_CONNTRACK,$(@D)/.config)
  265. $(call KCONFIG_ENABLE_OPT,CONFIG_NF_CONNTRACK_MARK,$(@D)/.config))
  266. $(if $(BR2_LINUX_KERNEL_APPENDED_DTB),
  267. $(call KCONFIG_ENABLE_OPT,CONFIG_ARM_APPENDED_DTB,$(@D)/.config))
  268. $(if $(BR2_PACKAGE_KERNEL_MODULE_IMX_GPU_VIV),
  269. $(call KCONFIG_DISABLE_OPT,CONFIG_MXC_GPU_VIV,$(@D)/.config))
  270. endef
  271. ifeq ($(BR2_LINUX_KERNEL_DTS_SUPPORT),y)
  272. ifeq ($(BR2_LINUX_KERNEL_DTB_IS_SELF_BUILT),)
  273. define LINUX_BUILD_DTB
  274. $(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(KERNEL_DTBS)
  275. endef
  276. ifeq ($(BR2_LINUX_KERNEL_APPENDED_DTB),)
  277. define LINUX_INSTALL_DTB
  278. # dtbs moved from arch/<ARCH>/boot to arch/<ARCH>/boot/dts since 3.8-rc1
  279. cp $(addprefix \
  280. $(KERNEL_ARCH_PATH)/boot/$(if $(wildcard \
  281. $(addprefix $(KERNEL_ARCH_PATH)/boot/dts/,$(KERNEL_DTBS))),dts/),$(KERNEL_DTBS)) \
  282. $(1)
  283. endef
  284. endif # BR2_LINUX_KERNEL_APPENDED_DTB
  285. endif # BR2_LINUX_KERNEL_DTB_IS_SELF_BUILT
  286. endif # BR2_LINUX_KERNEL_DTS_SUPPORT
  287. ifeq ($(BR2_LINUX_KERNEL_APPENDED_DTB),y)
  288. # dtbs moved from arch/$ARCH/boot to arch/$ARCH/boot/dts since 3.8-rc1
  289. define LINUX_APPEND_DTB
  290. (cd $(KERNEL_ARCH_PATH)/boot; \
  291. for dtb in $(KERNEL_DTS_NAME); do \
  292. if test -e $${dtb}.dtb ; then \
  293. dtbpath=$${dtb}.dtb ; \
  294. else \
  295. dtbpath=dts/$${dtb}.dtb ; \
  296. fi ; \
  297. cat zImage $${dtbpath} > zImage.$${dtb} || exit 1; \
  298. done)
  299. endef
  300. ifeq ($(BR2_LINUX_KERNEL_APPENDED_UIMAGE),y)
  301. # We need to generate a new u-boot image that takes into
  302. # account the extra-size added by the device tree at the end
  303. # of the image. To do so, we first need to retrieve both load
  304. # address and entry point for the kernel from the already
  305. # generate uboot image before using mkimage -l.
  306. LINUX_APPEND_DTB += ; \
  307. MKIMAGE_ARGS=`$(MKIMAGE) -l $(LINUX_IMAGE_PATH) |\
  308. sed -n -e 's/Image Name:[ ]*\(.*\)/-n \1/p' -e 's/Load Address:/-a/p' -e 's/Entry Point:/-e/p'`; \
  309. for dtb in $(KERNEL_DTS_NAME); do \
  310. $(MKIMAGE) -A $(MKIMAGE_ARCH) -O linux \
  311. -T kernel -C none $${MKIMAGE_ARGS} \
  312. -d $(KERNEL_ARCH_PATH)/boot/zImage.$${dtb} $(LINUX_IMAGE_PATH).$${dtb}; \
  313. done
  314. endif
  315. endif
  316. # Compilation. We make sure the kernel gets rebuilt when the
  317. # configuration has changed.
  318. define LINUX_BUILD_CMDS
  319. $(if $(BR2_LINUX_KERNEL_USE_CUSTOM_DTS),
  320. cp -f $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_DTS_PATH)) $(KERNEL_ARCH_PATH)/boot/dts/)
  321. $(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(LINUX_TARGET_NAME)
  322. @if grep -q "CONFIG_MODULES=y" $(@D)/.config; then \
  323. $(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) modules ; \
  324. fi
  325. $(LINUX_BUILD_DTB)
  326. $(LINUX_APPEND_DTB)
  327. endef
  328. ifeq ($(BR2_LINUX_KERNEL_APPENDED_DTB),y)
  329. # When a DTB was appended, install the potential several images with
  330. # appended DTBs.
  331. define LINUX_INSTALL_IMAGE
  332. mkdir -p $(1)
  333. cp $(KERNEL_ARCH_PATH)/boot/$(LINUX_IMAGE_NAME).* $(1)
  334. endef
  335. else
  336. # Otherwise, just install the unique image generated by the kernel
  337. # build process.
  338. define LINUX_INSTALL_IMAGE
  339. $(INSTALL) -m 0644 -D $(LINUX_IMAGE_PATH) $(1)/$(LINUX_IMAGE_NAME)
  340. endef
  341. endif
  342. ifeq ($(BR2_LINUX_KERNEL_INSTALL_TARGET),y)
  343. define LINUX_INSTALL_KERNEL_IMAGE_TO_TARGET
  344. $(call LINUX_INSTALL_IMAGE,$(TARGET_DIR)/boot)
  345. $(call LINUX_INSTALL_DTB,$(TARGET_DIR)/boot)
  346. endef
  347. endif
  348. define LINUX_INSTALL_HOST_TOOLS
  349. # Installing dtc (device tree compiler) as host tool, if selected
  350. if grep -q "CONFIG_DTC=y" $(@D)/.config; then \
  351. $(INSTALL) -D -m 0755 $(@D)/scripts/dtc/dtc $(HOST_DIR)/usr/bin/linux-dtc ; \
  352. if [ ! -e $(HOST_DIR)/usr/bin/dtc ]; then \
  353. ln -sf linux-dtc $(HOST_DIR)/usr/bin/dtc ; \
  354. fi \
  355. fi
  356. endef
  357. define LINUX_INSTALL_IMAGES_CMDS
  358. $(call LINUX_INSTALL_IMAGE,$(BINARIES_DIR))
  359. $(call LINUX_INSTALL_DTB,$(BINARIES_DIR))
  360. endef
  361. ifeq ($(BR2_STRIP_strip),y)
  362. LINUX_MAKE_FLAGS += INSTALL_MOD_STRIP=1
  363. endif
  364. define LINUX_INSTALL_TARGET_CMDS
  365. $(LINUX_INSTALL_KERNEL_IMAGE_TO_TARGET)
  366. # Install modules and remove symbolic links pointing to build
  367. # directories, not relevant on the target
  368. @if grep -q "CONFIG_MODULES=y" $(@D)/.config; then \
  369. $(LINUX_MAKE_ENV) $(MAKE1) $(LINUX_MAKE_FLAGS) -C $(@D) modules_install; \
  370. rm -f $(TARGET_DIR)/lib/modules/$(LINUX_VERSION_PROBED)/build ; \
  371. rm -f $(TARGET_DIR)/lib/modules/$(LINUX_VERSION_PROBED)/source ; \
  372. fi
  373. $(LINUX_INSTALL_HOST_TOOLS)
  374. endef
  375. # Include all our extensions.
  376. #
  377. # Note: our package infrastructure uses the full-path of the last-scanned
  378. # Makefile to determine what package we're currently defining, using the
  379. # last directory component in the path. As such, including other Makefile,
  380. # like below, before we call one of the *-package macro is usally not
  381. # working.
  382. # However, since the files we include here are in the same directory as
  383. # the current Makefile, we are OK. But this is a hard requirement: files
  384. # included here *must* be in the same directory!
  385. include $(sort $(wildcard linux/linux-ext-*.mk))
  386. LINUX_PATCH_DEPENDENCIES += $(foreach ext,$(LINUX_EXTENSIONS),\
  387. $(if $(BR2_LINUX_KERNEL_EXT_$(call UPPERCASE,$(ext))),$(ext)))
  388. LINUX_PRE_PATCH_HOOKS += $(foreach ext,$(LINUX_EXTENSIONS),\
  389. $(if $(BR2_LINUX_KERNEL_EXT_$(call UPPERCASE,$(ext))),\
  390. $(call UPPERCASE,$(ext))_PREPARE_KERNEL))
  391. # Checks to give errors that the user can understand
  392. # When a custom repository has been set, check for the repository version
  393. ifeq ($(BR2_LINUX_KERNEL_CUSTOM_SVN)$(BR2_LINUX_KERNEL_CUSTOM_GIT)$(BR2_LINUX_KERNEL_CUSTOM_HG),y)
  394. ifeq ($(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION)),)
  395. $(error No custom repository version set. Check your BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION setting)
  396. endif
  397. ifeq ($(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_URL)),)
  398. $(error No custom repo URL set. Check your BR2_LINUX_KERNEL_CUSTOM_REPO_URL setting)
  399. endif
  400. endif
  401. ifeq ($(BR_BUILDING),y)
  402. ifeq ($(BR2_LINUX_KERNEL_USE_DEFCONFIG),y)
  403. # We must use the user-supplied kconfig value, because
  404. # LINUX_KCONFIG_DEFCONFIG will at least contain the
  405. # trailing _defconfig
  406. ifeq ($(call qstrip,$(BR2_LINUX_KERNEL_DEFCONFIG)),)
  407. $(error No kernel defconfig name specified, check your BR2_LINUX_KERNEL_DEFCONFIG setting)
  408. endif
  409. endif
  410. ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG),y)
  411. ifeq ($(LINUX_KCONFIG_FILE),)
  412. $(error No kernel configuration file specified, check your BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE setting)
  413. endif
  414. endif
  415. ifeq ($(BR2_LINUX_KERNEL_DTS_SUPPORT)$(KERNEL_DTS_NAME),y)
  416. $(error No kernel device tree source specified, check your \
  417. BR2_LINUX_KERNEL_USE_INTREE_DTS / BR2_LINUX_KERNEL_USE_CUSTOM_DTS settings)
  418. endif
  419. endif # BR_BUILDING
  420. $(eval $(kconfig-package))
  421. # Support for rebuilding the kernel after the cpio archive has
  422. # been generated in $(BINARIES_DIR)/rootfs.cpio.
  423. $(LINUX_DIR)/.stamp_initramfs_rebuilt: $(LINUX_DIR)/.stamp_target_installed $(LINUX_DIR)/.stamp_images_installed $(BINARIES_DIR)/rootfs.cpio
  424. @$(call MESSAGE,"Rebuilding kernel with initramfs")
  425. # Build the kernel.
  426. $(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(LINUX_TARGET_NAME)
  427. $(LINUX_APPEND_DTB)
  428. # Copy the kernel image(s) to its(their) final destination
  429. $(call LINUX_INSTALL_IMAGE,$(BINARIES_DIR))
  430. # If there is a .ub file copy it to the final destination
  431. test ! -f $(LINUX_IMAGE_PATH).ub || cp $(LINUX_IMAGE_PATH).ub $(BINARIES_DIR)
  432. $(Q)touch $@
  433. # The initramfs building code must make sure this target gets called
  434. # after it generated the initramfs list of files.
  435. linux-rebuild-with-initramfs: $(LINUX_DIR)/.stamp_initramfs_rebuilt