linux.mk 22 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 = GPL-2.0
  8. ifeq ($(BR2_LINUX_KERNEL_LATEST_VERSION),y)
  9. LINUX_LICENSE_FILES = \
  10. COPYING \
  11. LICENSES/preferred/GPL-2.0 \
  12. LICENSES/exceptions/Linux-syscall-note
  13. endif
  14. define LINUX_HELP_CMDS
  15. @echo ' linux-menuconfig - Run Linux kernel menuconfig'
  16. @echo ' linux-savedefconfig - Run Linux kernel savedefconfig'
  17. @echo ' linux-update-defconfig - Save the Linux configuration to the path specified'
  18. @echo ' by BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE'
  19. endef
  20. # Compute LINUX_SOURCE and LINUX_SITE from the configuration
  21. ifeq ($(BR2_LINUX_KERNEL_CUSTOM_TARBALL),y)
  22. LINUX_TARBALL = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_TARBALL_LOCATION))
  23. LINUX_SITE = $(patsubst %/,%,$(dir $(LINUX_TARBALL)))
  24. LINUX_SOURCE = $(notdir $(LINUX_TARBALL))
  25. else ifeq ($(BR2_LINUX_KERNEL_CUSTOM_GIT),y)
  26. LINUX_SITE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_URL))
  27. LINUX_SITE_METHOD = git
  28. else ifeq ($(BR2_LINUX_KERNEL_CUSTOM_HG),y)
  29. LINUX_SITE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_URL))
  30. LINUX_SITE_METHOD = hg
  31. else ifeq ($(BR2_LINUX_KERNEL_CUSTOM_SVN),y)
  32. LINUX_SITE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_URL))
  33. LINUX_SITE_METHOD = svn
  34. else ifeq ($(BR2_LINUX_KERNEL_LATEST_CIP_VERSION)$(BR2_LINUX_KERNEL_LATEST_CIP_RT_VERSION),y)
  35. LINUX_SOURCE = linux-cip-$(LINUX_VERSION).tar.gz
  36. LINUX_SITE = https://git.kernel.org/pub/scm/linux/kernel/git/cip/linux-cip.git/snapshot
  37. else ifneq ($(findstring -rc,$(LINUX_VERSION)),)
  38. # Since 4.12-rc1, -rc kernels are generated from cgit. This also works for
  39. # older -rc kernels.
  40. LINUX_SITE = https://git.kernel.org/torvalds/t
  41. else
  42. LINUX_SOURCE = linux-$(LINUX_VERSION).tar.xz
  43. ifeq ($(findstring x2.6.,x$(LINUX_VERSION)),x2.6.)
  44. LINUX_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v2.6
  45. else
  46. LINUX_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v$(firstword $(subst ., ,$(LINUX_VERSION))).x
  47. endif
  48. endif
  49. ifeq ($(BR2_LINUX_KERNEL)$(BR2_LINUX_KERNEL_LATEST_VERSION),y)
  50. BR_NO_CHECK_HASH_FOR += $(LINUX_SOURCE)
  51. endif
  52. LINUX_PATCHES = $(call qstrip,$(BR2_LINUX_KERNEL_PATCH))
  53. # We have no way to know the hashes for user-supplied patches.
  54. BR_NO_CHECK_HASH_FOR += $(notdir $(LINUX_PATCHES))
  55. # We rely on the generic package infrastructure to download and apply
  56. # remote patches (downloaded from ftp, http or https). For local
  57. # patches, we can't rely on that infrastructure, because there might
  58. # be directories in the patch list (unlike for other packages).
  59. LINUX_PATCH = $(filter ftp://% http://% https://%,$(LINUX_PATCHES))
  60. # while the kernel is built for the target, the build may need various
  61. # host libraries depending on config (and version), so use
  62. # HOST_MAKE_ENV here. In particular, this ensures that our
  63. # host-pkgconf will look for host libraries and not target ones.
  64. LINUX_MAKE_ENV = \
  65. $(HOST_MAKE_ENV) \
  66. BR_BINARIES_DIR=$(BINARIES_DIR)
  67. LINUX_INSTALL_IMAGES = YES
  68. LINUX_DEPENDENCIES = host-kmod \
  69. $(if $(BR2_PACKAGE_INTEL_MICROCODE),intel-microcode)
  70. # Starting with 4.16, the generated kconfig paser code is no longer
  71. # shipped with the kernel sources, so we need flex and bison, but
  72. # only if the host does not have them.
  73. LINUX_KCONFIG_DEPENDENCIES = \
  74. $(BR2_BISON_HOST_DEPENDENCY) \
  75. $(BR2_FLEX_HOST_DEPENDENCY)
  76. # Starting with 4.18, the kconfig in the kernel calls the
  77. # cross-compiler to check its capabilities. So we need the
  78. # toolchain before we can call the configurators.
  79. LINUX_KCONFIG_DEPENDENCIES += toolchain
  80. # host tools needed for kernel compression
  81. ifeq ($(BR2_LINUX_KERNEL_LZ4),y)
  82. LINUX_DEPENDENCIES += host-lz4
  83. else ifeq ($(BR2_LINUX_KERNEL_LZMA),y)
  84. LINUX_DEPENDENCIES += host-lzma
  85. else ifeq ($(BR2_LINUX_KERNEL_LZO),y)
  86. LINUX_DEPENDENCIES += host-lzop
  87. else ifeq ($(BR2_LINUX_KERNEL_XZ),y)
  88. LINUX_DEPENDENCIES += host-xz
  89. endif
  90. LINUX_COMPRESSION_OPT_$(BR2_LINUX_KERNEL_GZIP) += CONFIG_KERNEL_GZIP
  91. LINUX_COMPRESSION_OPT_$(BR2_LINUX_KERNEL_LZ4) += CONFIG_KERNEL_LZ4
  92. LINUX_COMPRESSION_OPT_$(BR2_LINUX_KERNEL_LZMA) += CONFIG_KERNEL_LZMA
  93. LINUX_COMPRESSION_OPT_$(BR2_LINUX_KERNEL_LZO) += CONFIG_KERNEL_LZO
  94. LINUX_COMPRESSION_OPT_$(BR2_LINUX_KERNEL_XZ) += CONFIG_KERNEL_XZ
  95. ifeq ($(BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL),y)
  96. LINUX_DEPENDENCIES += host-openssl
  97. endif
  98. ifeq ($(BR2_LINUX_KERNEL_NEEDS_HOST_LIBELF),y)
  99. LINUX_DEPENDENCIES += host-elfutils host-pkgconf
  100. endif
  101. # If host-uboot-tools is selected by the user, assume it is needed to
  102. # create a custom image
  103. ifeq ($(BR2_PACKAGE_HOST_UBOOT_TOOLS),y)
  104. LINUX_DEPENDENCIES += host-uboot-tools
  105. endif
  106. ifneq ($(ARCH_XTENSA_OVERLAY_FILE),)
  107. define LINUX_XTENSA_OVERLAY_EXTRACT
  108. $(call arch-xtensa-overlay-extract,$(@D),linux)
  109. endef
  110. LINUX_POST_EXTRACT_HOOKS += LINUX_XTENSA_OVERLAY_EXTRACT
  111. LINUX_EXTRA_DOWNLOADS += $(ARCH_XTENSA_OVERLAY_URL)
  112. endif
  113. # We don't want to run depmod after installing the kernel. It's done in a
  114. # target-finalize hook, to encompass modules installed by packages.
  115. LINUX_MAKE_FLAGS = \
  116. HOSTCC="$(HOSTCC) $(HOST_CFLAGS) $(HOST_LDFLAGS)" \
  117. ARCH=$(KERNEL_ARCH) \
  118. INSTALL_MOD_PATH=$(TARGET_DIR) \
  119. CROSS_COMPILE="$(TARGET_CROSS)" \
  120. DEPMOD=$(HOST_DIR)/sbin/depmod
  121. ifeq ($(BR2_REPRODUCIBLE),y)
  122. LINUX_MAKE_ENV += \
  123. KBUILD_BUILD_VERSION=1 \
  124. KBUILD_BUILD_USER=buildroot \
  125. KBUILD_BUILD_HOST=buildroot \
  126. KBUILD_BUILD_TIMESTAMP="$(shell LC_ALL=C date -d @$(SOURCE_DATE_EPOCH))"
  127. endif
  128. # gcc-8 started warning about function aliases that have a
  129. # non-matching prototype. This seems rather useful in general, but it
  130. # causes tons of warnings in the Linux kernel, where we rely on
  131. # abusing those aliases for system call entry points, in order to
  132. # sanitize the arguments passed from user space in registers.
  133. # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82435
  134. ifeq ($(BR2_TOOLCHAIN_GCC_AT_LEAST_8),y)
  135. LINUX_MAKE_ENV += KCFLAGS=-Wno-attribute-alias
  136. endif
  137. ifeq ($(BR2_LINUX_KERNEL_DTB_OVERLAY_SUPPORT),y)
  138. LINUX_MAKE_ENV += DTC_FLAGS=-@
  139. endif
  140. # Get the real Linux version, which tells us where kernel modules are
  141. # going to be installed in the target filesystem.
  142. LINUX_VERSION_PROBED = `$(MAKE) $(LINUX_MAKE_FLAGS) -C $(LINUX_DIR) --no-print-directory -s kernelrelease 2>/dev/null`
  143. LINUX_DTS_NAME += $(call qstrip,$(BR2_LINUX_KERNEL_INTREE_DTS_NAME))
  144. # We keep only the .dts files, so that the user can specify both .dts
  145. # and .dtsi files in BR2_LINUX_KERNEL_CUSTOM_DTS_PATH. Both will be
  146. # copied to arch/<arch>/boot/dts, but only the .dts files will
  147. # actually be generated as .dtb.
  148. LINUX_DTS_NAME += $(basename $(filter %.dts,$(notdir $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_DTS_PATH)))))
  149. LINUX_DTBS = $(addsuffix .dtb,$(LINUX_DTS_NAME))
  150. ifeq ($(BR2_LINUX_KERNEL_IMAGE_TARGET_CUSTOM),y)
  151. LINUX_IMAGE_NAME = $(call qstrip,$(BR2_LINUX_KERNEL_IMAGE_NAME))
  152. LINUX_TARGET_NAME = $(call qstrip,$(BR2_LINUX_KERNEL_IMAGE_TARGET_NAME))
  153. ifeq ($(LINUX_IMAGE_NAME),)
  154. LINUX_IMAGE_NAME = $(LINUX_TARGET_NAME)
  155. endif
  156. else
  157. ifeq ($(BR2_LINUX_KERNEL_UIMAGE),y)
  158. LINUX_IMAGE_NAME = uImage
  159. else ifeq ($(BR2_LINUX_KERNEL_APPENDED_UIMAGE),y)
  160. LINUX_IMAGE_NAME = uImage
  161. else ifeq ($(BR2_LINUX_KERNEL_BZIMAGE),y)
  162. LINUX_IMAGE_NAME = bzImage
  163. else ifeq ($(BR2_LINUX_KERNEL_ZIMAGE),y)
  164. LINUX_IMAGE_NAME = zImage
  165. else ifeq ($(BR2_LINUX_KERNEL_ZIMAGE_EPAPR),y)
  166. LINUX_IMAGE_NAME = zImage.epapr
  167. else ifeq ($(BR2_LINUX_KERNEL_APPENDED_ZIMAGE),y)
  168. LINUX_IMAGE_NAME = zImage
  169. else ifeq ($(BR2_LINUX_KERNEL_CUIMAGE),y)
  170. LINUX_IMAGE_NAME = cuImage.$(firstword $(LINUX_DTS_NAME))
  171. else ifeq ($(BR2_LINUX_KERNEL_SIMPLEIMAGE),y)
  172. LINUX_IMAGE_NAME = simpleImage.$(firstword $(LINUX_DTS_NAME))
  173. else ifeq ($(BR2_LINUX_KERNEL_IMAGE),y)
  174. LINUX_IMAGE_NAME = Image
  175. else ifeq ($(BR2_LINUX_KERNEL_LINUX_BIN),y)
  176. LINUX_IMAGE_NAME = linux.bin
  177. else ifeq ($(BR2_LINUX_KERNEL_VMLINUX_BIN),y)
  178. LINUX_IMAGE_NAME = vmlinux.bin
  179. else ifeq ($(BR2_LINUX_KERNEL_VMLINUX),y)
  180. LINUX_IMAGE_NAME = vmlinux
  181. else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ),y)
  182. LINUX_IMAGE_NAME = vmlinuz
  183. else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ_BIN),y)
  184. LINUX_IMAGE_NAME = vmlinuz.bin
  185. endif
  186. # The if-else blocks above are all the image types we know of, and all
  187. # come from a Kconfig choice, so we know we have LINUX_IMAGE_NAME set
  188. # to something
  189. LINUX_TARGET_NAME = $(LINUX_IMAGE_NAME)
  190. endif
  191. LINUX_KERNEL_UIMAGE_LOADADDR = $(call qstrip,$(BR2_LINUX_KERNEL_UIMAGE_LOADADDR))
  192. ifneq ($(LINUX_KERNEL_UIMAGE_LOADADDR),)
  193. LINUX_MAKE_FLAGS += LOADADDR="$(LINUX_KERNEL_UIMAGE_LOADADDR)"
  194. endif
  195. # Compute the arch path, since i386 and x86_64 are in arch/x86 and not
  196. # in arch/$(KERNEL_ARCH). Even if the kernel creates symbolic links
  197. # for bzImage, arch/i386 and arch/x86_64 do not exist when copying the
  198. # defconfig file.
  199. ifeq ($(KERNEL_ARCH),i386)
  200. LINUX_ARCH_PATH = $(LINUX_DIR)/arch/x86
  201. else ifeq ($(KERNEL_ARCH),x86_64)
  202. LINUX_ARCH_PATH = $(LINUX_DIR)/arch/x86
  203. else
  204. LINUX_ARCH_PATH = $(LINUX_DIR)/arch/$(KERNEL_ARCH)
  205. endif
  206. ifeq ($(BR2_LINUX_KERNEL_VMLINUX),y)
  207. LINUX_IMAGE_PATH = $(LINUX_DIR)/$(LINUX_IMAGE_NAME)
  208. else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ),y)
  209. LINUX_IMAGE_PATH = $(LINUX_DIR)/$(LINUX_IMAGE_NAME)
  210. else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ_BIN),y)
  211. LINUX_IMAGE_PATH = $(LINUX_DIR)/$(LINUX_IMAGE_NAME)
  212. else
  213. LINUX_IMAGE_PATH = $(LINUX_ARCH_PATH)/boot/$(LINUX_IMAGE_NAME)
  214. endif # BR2_LINUX_KERNEL_VMLINUX
  215. define LINUX_APPLY_LOCAL_PATCHES
  216. for p in $(filter-out ftp://% http://% https://%,$(LINUX_PATCHES)) ; do \
  217. if test -d $$p ; then \
  218. $(APPLY_PATCHES) $(@D) $$p \*.patch || exit 1 ; \
  219. else \
  220. $(APPLY_PATCHES) $(@D) `dirname $$p` `basename $$p` || exit 1; \
  221. fi \
  222. done
  223. endef
  224. LINUX_POST_PATCH_HOOKS += LINUX_APPLY_LOCAL_PATCHES
  225. # Older linux kernels use deprecated perl constructs in timeconst.pl
  226. # that were removed for perl 5.22+ so it breaks on newer distributions
  227. # Try a dry-run patch to see if this applies, if it does go ahead
  228. define LINUX_TRY_PATCH_TIMECONST
  229. @if patch -p1 --dry-run -f -s -d $(@D) <$(LINUX_PKGDIR)/0001-timeconst.pl-Eliminate-Perl-warning.patch.conditional >/dev/null ; then \
  230. $(APPLY_PATCHES) $(@D) $(LINUX_PKGDIR) 0001-timeconst.pl-Eliminate-Perl-warning.patch.conditional ; \
  231. fi
  232. endef
  233. LINUX_POST_PATCH_HOOKS += LINUX_TRY_PATCH_TIMECONST
  234. LINUX_KERNEL_CUSTOM_LOGO_PATH = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_LOGO_PATH))
  235. ifneq ($(LINUX_KERNEL_CUSTOM_LOGO_PATH),)
  236. LINUX_DEPENDENCIES += host-imagemagick
  237. define LINUX_KERNEL_CUSTOM_LOGO_CONVERT
  238. $(HOST_DIR)/bin/convert $(LINUX_KERNEL_CUSTOM_LOGO_PATH) \
  239. -dither None -colors 224 -compress none \
  240. $(LINUX_DIR)/drivers/video/logo/logo_linux_clut224.ppm
  241. endef
  242. LINUX_PRE_BUILD_HOOKS += LINUX_KERNEL_CUSTOM_LOGO_CONVERT
  243. endif
  244. ifeq ($(BR2_LINUX_KERNEL_USE_DEFCONFIG),y)
  245. LINUX_KCONFIG_DEFCONFIG = $(call qstrip,$(BR2_LINUX_KERNEL_DEFCONFIG))_defconfig
  246. else ifeq ($(BR2_LINUX_KERNEL_USE_ARCH_DEFAULT_CONFIG),y)
  247. LINUX_KCONFIG_DEFCONFIG = defconfig
  248. else ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG),y)
  249. LINUX_KCONFIG_FILE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE))
  250. endif
  251. LINUX_KCONFIG_FRAGMENT_FILES = $(call qstrip,$(BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES))
  252. LINUX_KCONFIG_EDITORS = menuconfig xconfig gconfig nconfig
  253. # LINUX_MAKE_FLAGS overrides HOSTCC to allow the kernel build to find
  254. # our host-openssl and host-libelf. However, this triggers a bug in
  255. # the kconfig build script that causes it to build with
  256. # /usr/include/ncurses.h (which is typically wchar) but link with
  257. # $(HOST_DIR)/lib/libncurses.so (which is not). We don't actually
  258. # need any host-package for kconfig, so remove the HOSTCC override
  259. # again. In addition, even though linux depends on the toolchain and
  260. # therefore host-ccache would be ready, we use HOSTCC_NOCCACHE for
  261. # consistency with other kconfig packages.
  262. LINUX_KCONFIG_OPTS = $(LINUX_MAKE_FLAGS) HOSTCC="$(HOSTCC_NOCCACHE)"
  263. # If no package has yet set it, set it from the Kconfig option
  264. LINUX_NEEDS_MODULES ?= $(BR2_LINUX_NEEDS_MODULES)
  265. # Make sure the Linux kernel is built with the right endianness. Not
  266. # all architectures support
  267. # CONFIG_CPU_BIG_ENDIAN/CONFIG_CPU_LITTLE_ENDIAN in Linux, but the
  268. # option will be thrown away and ignored if it doesn't exist.
  269. ifeq ($(BR2_ENDIAN),"BIG")
  270. define LINUX_FIXUP_CONFIG_ENDIANNESS
  271. $(call KCONFIG_ENABLE_OPT,CONFIG_CPU_BIG_ENDIAN)
  272. endef
  273. else
  274. define LINUX_FIXUP_CONFIG_ENDIANNESS
  275. $(call KCONFIG_ENABLE_OPT,CONFIG_CPU_LITTLE_ENDIAN)
  276. endef
  277. endif
  278. define LINUX_KCONFIG_FIXUP_CMDS
  279. $(if $(LINUX_NEEDS_MODULES),
  280. $(call KCONFIG_ENABLE_OPT,CONFIG_MODULES))
  281. $(call KCONFIG_ENABLE_OPT,$(strip $(LINUX_COMPRESSION_OPT_y)))
  282. $(foreach opt, $(LINUX_COMPRESSION_OPT_),
  283. $(call KCONFIG_DISABLE_OPT,$(opt))
  284. )
  285. $(LINUX_FIXUP_CONFIG_ENDIANNESS)
  286. $(if $(BR2_arm)$(BR2_armeb),
  287. $(call KCONFIG_ENABLE_OPT,CONFIG_AEABI))
  288. $(if $(BR2_powerpc)$(BR2_powerpc64)$(BR2_powerpc64le),
  289. $(call KCONFIG_ENABLE_OPT,CONFIG_PPC_DISABLE_WERROR))
  290. $(if $(BR2_ARC_PAGE_SIZE_4K),
  291. $(call KCONFIG_ENABLE_OPT,CONFIG_ARC_PAGE_SIZE_4K)
  292. $(call KCONFIG_DISABLE_OPT,CONFIG_ARC_PAGE_SIZE_8K)
  293. $(call KCONFIG_DISABLE_OPT,CONFIG_ARC_PAGE_SIZE_16K))
  294. $(if $(BR2_ARC_PAGE_SIZE_8K),
  295. $(call KCONFIG_DISABLE_OPT,CONFIG_ARC_PAGE_SIZE_4K)
  296. $(call KCONFIG_ENABLE_OPT,CONFIG_ARC_PAGE_SIZE_8K)
  297. $(call KCONFIG_DISABLE_OPT,CONFIG_ARC_PAGE_SIZE_16K))
  298. $(if $(BR2_ARC_PAGE_SIZE_16K),
  299. $(call KCONFIG_DISABLE_OPT,CONFIG_ARC_PAGE_SIZE_4K)
  300. $(call KCONFIG_DISABLE_OPT,CONFIG_ARC_PAGE_SIZE_8K)
  301. $(call KCONFIG_ENABLE_OPT,CONFIG_ARC_PAGE_SIZE_16K))
  302. $(if $(BR2_TARGET_ROOTFS_CPIO),
  303. $(call KCONFIG_ENABLE_OPT,CONFIG_BLK_DEV_INITRD))
  304. # As the kernel gets compiled before root filesystems are
  305. # built, we create a fake cpio file. It'll be
  306. # replaced later by the real cpio archive, and the kernel will be
  307. # rebuilt using the linux-rebuild-with-initramfs target.
  308. $(if $(BR2_TARGET_ROOTFS_INITRAMFS),
  309. mkdir -p $(BINARIES_DIR)
  310. touch $(BINARIES_DIR)/rootfs.cpio
  311. $(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_SOURCE,"$${BR_BINARIES_DIR}/rootfs.cpio")
  312. $(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_ROOT_UID,0)
  313. $(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_ROOT_GID,0))
  314. $(if $(BR2_ROOTFS_DEVICE_CREATION_STATIC),,
  315. $(call KCONFIG_ENABLE_OPT,CONFIG_DEVTMPFS)
  316. $(call KCONFIG_ENABLE_OPT,CONFIG_DEVTMPFS_MOUNT))
  317. $(if $(BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_EUDEV),
  318. $(call KCONFIG_ENABLE_OPT,CONFIG_INOTIFY_USER))
  319. $(if $(BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_MDEV),
  320. $(call KCONFIG_ENABLE_OPT,CONFIG_NET))
  321. $(if $(BR2_LINUX_KERNEL_APPENDED_DTB),
  322. $(call KCONFIG_ENABLE_OPT,CONFIG_ARM_APPENDED_DTB))
  323. $(if $(LINUX_KERNEL_CUSTOM_LOGO_PATH),
  324. $(call KCONFIG_ENABLE_OPT,CONFIG_FB)
  325. $(call KCONFIG_ENABLE_OPT,CONFIG_LOGO)
  326. $(call KCONFIG_ENABLE_OPT,CONFIG_LOGO_LINUX_CLUT224))
  327. $(call KCONFIG_DISABLE_OPT,CONFIG_GCC_PLUGINS)
  328. $(PACKAGES_LINUX_CONFIG_FIXUPS)
  329. endef
  330. ifeq ($(BR2_LINUX_KERNEL_DTS_SUPPORT),y)
  331. # Starting with 4.17, the generated dtc parser code is no longer
  332. # shipped with the kernel sources, so we need flex and bison. For
  333. # reproducibility, we use our owns rather than the host ones.
  334. LINUX_DEPENDENCIES += host-bison host-flex
  335. ifeq ($(BR2_LINUX_KERNEL_DTB_IS_SELF_BUILT),)
  336. define LINUX_BUILD_DTB
  337. $(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(LINUX_DTBS)
  338. endef
  339. ifeq ($(BR2_LINUX_KERNEL_APPENDED_DTB),)
  340. define LINUX_INSTALL_DTB
  341. # dtbs moved from arch/<ARCH>/boot to arch/<ARCH>/boot/dts since 3.8-rc1
  342. cp $(addprefix \
  343. $(LINUX_ARCH_PATH)/boot/$(if $(wildcard \
  344. $(addprefix $(LINUX_ARCH_PATH)/boot/dts/,$(LINUX_DTBS))),dts/),$(LINUX_DTBS)) \
  345. $(1)
  346. endef
  347. endif # BR2_LINUX_KERNEL_APPENDED_DTB
  348. endif # BR2_LINUX_KERNEL_DTB_IS_SELF_BUILT
  349. endif # BR2_LINUX_KERNEL_DTS_SUPPORT
  350. ifeq ($(BR2_LINUX_KERNEL_APPENDED_DTB),y)
  351. # dtbs moved from arch/$ARCH/boot to arch/$ARCH/boot/dts since 3.8-rc1
  352. define LINUX_APPEND_DTB
  353. (cd $(LINUX_ARCH_PATH)/boot; \
  354. for dtb in $(LINUX_DTS_NAME); do \
  355. if test -e $${dtb}.dtb ; then \
  356. dtbpath=$${dtb}.dtb ; \
  357. else \
  358. dtbpath=dts/$${dtb}.dtb ; \
  359. fi ; \
  360. cat zImage $${dtbpath} > zImage.$${dtb} || exit 1; \
  361. done)
  362. endef
  363. ifeq ($(BR2_LINUX_KERNEL_APPENDED_UIMAGE),y)
  364. # We need to generate a new u-boot image that takes into
  365. # account the extra-size added by the device tree at the end
  366. # of the image. To do so, we first need to retrieve both load
  367. # address and entry point for the kernel from the already
  368. # generate uboot image before using mkimage -l.
  369. LINUX_APPEND_DTB += ; \
  370. MKIMAGE_ARGS=`$(MKIMAGE) -l $(LINUX_IMAGE_PATH) |\
  371. sed -n -e 's/Image Name:[ ]*\(.*\)/-n \1/p' -e 's/Load Address:/-a/p' -e 's/Entry Point:/-e/p'`; \
  372. for dtb in $(LINUX_DTS_NAME); do \
  373. $(MKIMAGE) -A $(MKIMAGE_ARCH) -O linux \
  374. -T kernel -C none $${MKIMAGE_ARGS} \
  375. -d $(LINUX_ARCH_PATH)/boot/zImage.$${dtb} $(LINUX_IMAGE_PATH).$${dtb}; \
  376. done
  377. endif
  378. endif
  379. # Compilation. We make sure the kernel gets rebuilt when the
  380. # configuration has changed. We call the 'all' and
  381. # '$(LINUX_TARGET_NAME)' targets separately because calling them in
  382. # the same $(MAKE) invocation has shown to cause parallel build
  383. # issues.
  384. # The call to disable gcc-plugins is a stop-gap measure:
  385. # http://lists.busybox.net/pipermail/buildroot/2020-May/282727.html
  386. define LINUX_BUILD_CMDS
  387. $(call KCONFIG_DISABLE_OPT,CONFIG_GCC_PLUGINS)
  388. $(foreach dts,$(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_DTS_PATH)), \
  389. cp -f $(dts) $(LINUX_ARCH_PATH)/boot/dts/
  390. )
  391. $(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) all
  392. $(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(LINUX_TARGET_NAME)
  393. $(LINUX_BUILD_DTB)
  394. $(LINUX_APPEND_DTB)
  395. endef
  396. ifeq ($(BR2_LINUX_KERNEL_APPENDED_DTB),y)
  397. # When a DTB was appended, install the potential several images with
  398. # appended DTBs.
  399. define LINUX_INSTALL_IMAGE
  400. mkdir -p $(1)
  401. cp $(LINUX_ARCH_PATH)/boot/$(LINUX_IMAGE_NAME).* $(1)
  402. endef
  403. else
  404. # Otherwise, just install the unique image generated by the kernel
  405. # build process.
  406. define LINUX_INSTALL_IMAGE
  407. $(INSTALL) -m 0644 -D $(LINUX_IMAGE_PATH) $(1)/$(notdir $(LINUX_IMAGE_NAME))
  408. endef
  409. endif
  410. ifeq ($(BR2_LINUX_KERNEL_INSTALL_TARGET),y)
  411. define LINUX_INSTALL_KERNEL_IMAGE_TO_TARGET
  412. $(call LINUX_INSTALL_IMAGE,$(TARGET_DIR)/boot)
  413. $(call LINUX_INSTALL_DTB,$(TARGET_DIR)/boot)
  414. endef
  415. endif
  416. define LINUX_INSTALL_HOST_TOOLS
  417. # Installing dtc (device tree compiler) as host tool, if selected
  418. if grep -q "CONFIG_DTC=y" $(@D)/.config; then \
  419. $(INSTALL) -D -m 0755 $(@D)/scripts/dtc/dtc $(HOST_DIR)/bin/linux-dtc ; \
  420. $(if $(BR2_PACKAGE_HOST_DTC),,ln -sf linux-dtc $(HOST_DIR)/bin/dtc;) \
  421. fi
  422. endef
  423. define LINUX_INSTALL_IMAGES_CMDS
  424. $(call LINUX_INSTALL_IMAGE,$(BINARIES_DIR))
  425. $(call LINUX_INSTALL_DTB,$(BINARIES_DIR))
  426. endef
  427. ifeq ($(BR2_STRIP_strip),y)
  428. LINUX_MAKE_FLAGS += INSTALL_MOD_STRIP=1
  429. endif
  430. define LINUX_INSTALL_TARGET_CMDS
  431. $(LINUX_INSTALL_KERNEL_IMAGE_TO_TARGET)
  432. # Install modules and remove symbolic links pointing to build
  433. # directories, not relevant on the target
  434. @if grep -q "CONFIG_MODULES=y" $(@D)/.config; then \
  435. $(LINUX_MAKE_ENV) $(MAKE1) $(LINUX_MAKE_FLAGS) -C $(@D) modules_install; \
  436. rm -f $(TARGET_DIR)/lib/modules/$(LINUX_VERSION_PROBED)/build ; \
  437. rm -f $(TARGET_DIR)/lib/modules/$(LINUX_VERSION_PROBED)/source ; \
  438. fi
  439. $(LINUX_INSTALL_HOST_TOOLS)
  440. endef
  441. # Run depmod in a target-finalize hook, to encompass modules installed by
  442. # packages.
  443. define LINUX_RUN_DEPMOD
  444. if grep -q "CONFIG_MODULES=y" $(LINUX_DIR)/.config; then \
  445. $(HOST_DIR)/sbin/depmod -a -b $(TARGET_DIR) $(LINUX_VERSION_PROBED); \
  446. fi
  447. endef
  448. LINUX_TARGET_FINALIZE_HOOKS += LINUX_RUN_DEPMOD
  449. # Include all our extensions.
  450. #
  451. # Note: our package infrastructure uses the full-path of the last-scanned
  452. # Makefile to determine what package we're currently defining, using the
  453. # last directory component in the path. Additionally, the full path of
  454. # the package directory is also stored in _PKGDIR (e.g. to find patches)
  455. #
  456. # As such, including other Makefiles, like below, before we call one of
  457. # the *-package macros usually doesn't work.
  458. #
  459. # However, by including the in-tree extensions after the ones from the
  460. # br2-external trees, we're back to the situation where the last Makefile
  461. # scanned *is* included from the correct directory.
  462. #
  463. # NOTE: this is very fragile, and extra care must be taken to ensure that
  464. # we always end up with an in-tree included file. That's mostly OK, because
  465. # we do have in-tree linux-extensions.
  466. #
  467. include $(sort $(wildcard $(foreach ext,$(BR2_EXTERNAL_DIRS), \
  468. $(ext)/linux/linux-ext-*.mk)))
  469. include $(sort $(wildcard linux/linux-ext-*.mk))
  470. LINUX_PATCH_DEPENDENCIES += $(foreach ext,$(LINUX_EXTENSIONS),\
  471. $(if $(BR2_LINUX_KERNEL_EXT_$(call UPPERCASE,$(ext))),$(ext)))
  472. LINUX_PRE_PATCH_HOOKS += $(foreach ext,$(LINUX_EXTENSIONS),\
  473. $(if $(BR2_LINUX_KERNEL_EXT_$(call UPPERCASE,$(ext))),\
  474. $(call UPPERCASE,$(ext))_PREPARE_KERNEL))
  475. # Checks to give errors that the user can understand
  476. # When a custom repository has been set, check for the repository version
  477. ifeq ($(BR2_LINUX_KERNEL_CUSTOM_SVN)$(BR2_LINUX_KERNEL_CUSTOM_GIT)$(BR2_LINUX_KERNEL_CUSTOM_HG),y)
  478. ifeq ($(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION)),)
  479. $(error No custom repository version set. Check your BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION setting)
  480. endif
  481. ifeq ($(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_URL)),)
  482. $(error No custom repo URL set. Check your BR2_LINUX_KERNEL_CUSTOM_REPO_URL setting)
  483. endif
  484. endif
  485. ifeq ($(BR_BUILDING),y)
  486. ifeq ($(BR2_LINUX_KERNEL_USE_DEFCONFIG),y)
  487. # We must use the user-supplied kconfig value, because
  488. # LINUX_KCONFIG_DEFCONFIG will at least contain the
  489. # trailing _defconfig
  490. ifeq ($(call qstrip,$(BR2_LINUX_KERNEL_DEFCONFIG)),)
  491. $(error No kernel defconfig name specified, check your BR2_LINUX_KERNEL_DEFCONFIG setting)
  492. endif
  493. endif
  494. ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG),y)
  495. ifeq ($(LINUX_KCONFIG_FILE),)
  496. $(error No kernel configuration file specified, check your BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE setting)
  497. endif
  498. endif
  499. ifeq ($(BR2_LINUX_KERNEL_DTS_SUPPORT):$(strip $(LINUX_DTS_NAME)),y:)
  500. $(error No kernel device tree source specified, check your \
  501. BR2_LINUX_KERNEL_INTREE_DTS_NAME / BR2_LINUX_KERNEL_CUSTOM_DTS_PATH settings)
  502. endif
  503. endif # BR_BUILDING
  504. $(eval $(kconfig-package))
  505. # Support for rebuilding the kernel after the cpio archive has
  506. # been generated.
  507. .PHONY: linux-rebuild-with-initramfs
  508. linux-rebuild-with-initramfs: $(LINUX_DIR)/.stamp_target_installed
  509. linux-rebuild-with-initramfs: $(LINUX_DIR)/.stamp_images_installed
  510. linux-rebuild-with-initramfs: rootfs-cpio
  511. linux-rebuild-with-initramfs:
  512. @$(call MESSAGE,"Rebuilding kernel with initramfs")
  513. # Build the kernel.
  514. $(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(LINUX_DIR) $(LINUX_TARGET_NAME)
  515. $(LINUX_APPEND_DTB)
  516. # Copy the kernel image(s) to its(their) final destination
  517. $(call LINUX_INSTALL_IMAGE,$(BINARIES_DIR))
  518. # If there is a .ub file copy it to the final destination
  519. test ! -f $(LINUX_IMAGE_PATH).ub || cp $(LINUX_IMAGE_PATH).ub $(BINARIES_DIR)