linux.mk 23 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 ($(BR2_LINUX_KERNEL_XZ),y)
  88. LINUX_DEPENDENCIES += host-xz
  89. else ifeq ($(BR2_LINUX_KERNEL_ZSTD),y)
  90. LINUX_DEPENDENCIES += host-zstd
  91. endif
  92. LINUX_COMPRESSION_OPT_$(BR2_LINUX_KERNEL_GZIP) += CONFIG_KERNEL_GZIP
  93. LINUX_COMPRESSION_OPT_$(BR2_LINUX_KERNEL_LZ4) += CONFIG_KERNEL_LZ4
  94. LINUX_COMPRESSION_OPT_$(BR2_LINUX_KERNEL_LZMA) += CONFIG_KERNEL_LZMA
  95. LINUX_COMPRESSION_OPT_$(BR2_LINUX_KERNEL_LZO) += CONFIG_KERNEL_LZO
  96. LINUX_COMPRESSION_OPT_$(BR2_LINUX_KERNEL_XZ) += CONFIG_KERNEL_XZ
  97. LINUX_COMPRESSION_OPT_$(BR2_LINUX_KERNEL_ZSTD) += CONFIG_KERNEL_ZSTD
  98. ifeq ($(BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL),y)
  99. LINUX_DEPENDENCIES += host-openssl
  100. endif
  101. ifeq ($(BR2_LINUX_KERNEL_NEEDS_HOST_LIBELF),y)
  102. LINUX_DEPENDENCIES += host-elfutils host-pkgconf
  103. endif
  104. # If host-uboot-tools is selected by the user, assume it is needed to
  105. # create a custom image
  106. ifeq ($(BR2_PACKAGE_HOST_UBOOT_TOOLS),y)
  107. LINUX_DEPENDENCIES += host-uboot-tools
  108. endif
  109. ifneq ($(ARCH_XTENSA_OVERLAY_FILE),)
  110. define LINUX_XTENSA_OVERLAY_EXTRACT
  111. $(call arch-xtensa-overlay-extract,$(@D),linux)
  112. endef
  113. LINUX_POST_EXTRACT_HOOKS += LINUX_XTENSA_OVERLAY_EXTRACT
  114. LINUX_EXTRA_DOWNLOADS += $(ARCH_XTENSA_OVERLAY_URL)
  115. endif
  116. # We don't want to run depmod after installing the kernel. It's done in a
  117. # target-finalize hook, to encompass modules installed by packages.
  118. LINUX_MAKE_FLAGS = \
  119. HOSTCC="$(HOSTCC) $(HOST_CFLAGS) $(HOST_LDFLAGS)" \
  120. ARCH=$(KERNEL_ARCH) \
  121. INSTALL_MOD_PATH=$(TARGET_DIR) \
  122. CROSS_COMPILE="$(TARGET_CROSS)" \
  123. DEPMOD=$(HOST_DIR)/sbin/depmod
  124. ifeq ($(BR2_REPRODUCIBLE),y)
  125. LINUX_MAKE_ENV += \
  126. KBUILD_BUILD_VERSION=1 \
  127. KBUILD_BUILD_USER=buildroot \
  128. KBUILD_BUILD_HOST=buildroot \
  129. KBUILD_BUILD_TIMESTAMP="$(shell LC_ALL=C date -d @$(SOURCE_DATE_EPOCH))"
  130. endif
  131. # gcc-8 started warning about function aliases that have a
  132. # non-matching prototype. This seems rather useful in general, but it
  133. # causes tons of warnings in the Linux kernel, where we rely on
  134. # abusing those aliases for system call entry points, in order to
  135. # sanitize the arguments passed from user space in registers.
  136. # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82435
  137. ifeq ($(BR2_TOOLCHAIN_GCC_AT_LEAST_8),y)
  138. LINUX_MAKE_ENV += KCFLAGS=-Wno-attribute-alias
  139. endif
  140. ifeq ($(BR2_LINUX_KERNEL_DTB_OVERLAY_SUPPORT),y)
  141. LINUX_MAKE_ENV += DTC_FLAGS=-@
  142. endif
  143. # Get the real Linux version, which tells us where kernel modules are
  144. # going to be installed in the target filesystem.
  145. # Filter out 'w' from MAKEFLAGS, to workaround a bug in make 4.1 (#13141)
  146. LINUX_VERSION_PROBED = `MAKEFLAGS='$(filter-out w,$(MAKEFLAGS))' $(MAKE) $(LINUX_MAKE_FLAGS) -C $(LINUX_DIR) --no-print-directory -s kernelrelease 2>/dev/null`
  147. LINUX_DTS_NAME += $(call qstrip,$(BR2_LINUX_KERNEL_INTREE_DTS_NAME))
  148. # We keep only the .dts files, so that the user can specify both .dts
  149. # and .dtsi files in BR2_LINUX_KERNEL_CUSTOM_DTS_PATH. Both will be
  150. # copied to arch/<arch>/boot/dts, but only the .dts files will
  151. # actually be generated as .dtb.
  152. LINUX_DTS_NAME += $(basename $(filter %.dts,$(notdir $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_DTS_PATH)))))
  153. LINUX_DTBS = $(addsuffix .dtb,$(LINUX_DTS_NAME))
  154. ifeq ($(BR2_LINUX_KERNEL_IMAGE_TARGET_CUSTOM),y)
  155. LINUX_IMAGE_NAME = $(call qstrip,$(BR2_LINUX_KERNEL_IMAGE_NAME))
  156. LINUX_TARGET_NAME = $(call qstrip,$(BR2_LINUX_KERNEL_IMAGE_TARGET_NAME))
  157. ifeq ($(LINUX_IMAGE_NAME),)
  158. LINUX_IMAGE_NAME = $(LINUX_TARGET_NAME)
  159. endif
  160. else
  161. ifeq ($(BR2_LINUX_KERNEL_UIMAGE),y)
  162. LINUX_IMAGE_NAME = uImage
  163. else ifeq ($(BR2_LINUX_KERNEL_APPENDED_UIMAGE),y)
  164. LINUX_IMAGE_NAME = uImage
  165. else ifeq ($(BR2_LINUX_KERNEL_BZIMAGE),y)
  166. LINUX_IMAGE_NAME = bzImage
  167. else ifeq ($(BR2_LINUX_KERNEL_ZIMAGE),y)
  168. LINUX_IMAGE_NAME = zImage
  169. else ifeq ($(BR2_LINUX_KERNEL_ZIMAGE_EPAPR),y)
  170. LINUX_IMAGE_NAME = zImage.epapr
  171. else ifeq ($(BR2_LINUX_KERNEL_APPENDED_ZIMAGE),y)
  172. LINUX_IMAGE_NAME = zImage
  173. else ifeq ($(BR2_LINUX_KERNEL_CUIMAGE),y)
  174. LINUX_IMAGE_NAME = cuImage.$(firstword $(LINUX_DTS_NAME))
  175. else ifeq ($(BR2_LINUX_KERNEL_SIMPLEIMAGE),y)
  176. LINUX_IMAGE_NAME = simpleImage.$(firstword $(LINUX_DTS_NAME))
  177. else ifeq ($(BR2_LINUX_KERNEL_IMAGE),y)
  178. LINUX_IMAGE_NAME = Image
  179. else ifeq ($(BR2_LINUX_KERNEL_LINUX_BIN),y)
  180. LINUX_IMAGE_NAME = linux.bin
  181. else ifeq ($(BR2_LINUX_KERNEL_VMLINUX_BIN),y)
  182. LINUX_IMAGE_NAME = vmlinux.bin
  183. else ifeq ($(BR2_LINUX_KERNEL_VMLINUX),y)
  184. LINUX_IMAGE_NAME = vmlinux
  185. else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ),y)
  186. LINUX_IMAGE_NAME = vmlinuz
  187. else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ_BIN),y)
  188. LINUX_IMAGE_NAME = vmlinuz.bin
  189. endif
  190. # The if-else blocks above are all the image types we know of, and all
  191. # come from a Kconfig choice, so we know we have LINUX_IMAGE_NAME set
  192. # to something
  193. LINUX_TARGET_NAME = $(LINUX_IMAGE_NAME)
  194. endif
  195. LINUX_KERNEL_UIMAGE_LOADADDR = $(call qstrip,$(BR2_LINUX_KERNEL_UIMAGE_LOADADDR))
  196. ifneq ($(LINUX_KERNEL_UIMAGE_LOADADDR),)
  197. LINUX_MAKE_FLAGS += LOADADDR="$(LINUX_KERNEL_UIMAGE_LOADADDR)"
  198. endif
  199. # Compute the arch path, since i386 and x86_64 are in arch/x86 and not
  200. # in arch/$(KERNEL_ARCH). Even if the kernel creates symbolic links
  201. # for bzImage, arch/i386 and arch/x86_64 do not exist when copying the
  202. # defconfig file.
  203. ifeq ($(KERNEL_ARCH),i386)
  204. LINUX_ARCH_PATH = $(LINUX_DIR)/arch/x86
  205. else ifeq ($(KERNEL_ARCH),x86_64)
  206. LINUX_ARCH_PATH = $(LINUX_DIR)/arch/x86
  207. else
  208. LINUX_ARCH_PATH = $(LINUX_DIR)/arch/$(KERNEL_ARCH)
  209. endif
  210. ifeq ($(BR2_LINUX_KERNEL_VMLINUX),y)
  211. LINUX_IMAGE_PATH = $(LINUX_DIR)/$(LINUX_IMAGE_NAME)
  212. else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ),y)
  213. LINUX_IMAGE_PATH = $(LINUX_DIR)/$(LINUX_IMAGE_NAME)
  214. else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ_BIN),y)
  215. LINUX_IMAGE_PATH = $(LINUX_DIR)/$(LINUX_IMAGE_NAME)
  216. else
  217. LINUX_IMAGE_PATH = $(LINUX_ARCH_PATH)/boot/$(LINUX_IMAGE_NAME)
  218. endif # BR2_LINUX_KERNEL_VMLINUX
  219. define LINUX_APPLY_LOCAL_PATCHES
  220. for p in $(filter-out ftp://% http://% https://%,$(LINUX_PATCHES)) ; do \
  221. if test -d $$p ; then \
  222. $(APPLY_PATCHES) $(@D) $$p \*.patch || exit 1 ; \
  223. else \
  224. $(APPLY_PATCHES) $(@D) `dirname $$p` `basename $$p` || exit 1; \
  225. fi \
  226. done
  227. endef
  228. LINUX_POST_PATCH_HOOKS += LINUX_APPLY_LOCAL_PATCHES
  229. # Older linux kernels use deprecated perl constructs in timeconst.pl
  230. # that were removed for perl 5.22+ so it breaks on newer distributions
  231. # Try a dry-run patch to see if this applies, if it does go ahead
  232. define LINUX_TRY_PATCH_TIMECONST
  233. @if patch -p1 --dry-run -f -s -d $(@D) <$(LINUX_PKGDIR)/0001-timeconst.pl-Eliminate-Perl-warning.patch.conditional >/dev/null ; then \
  234. $(APPLY_PATCHES) $(@D) $(LINUX_PKGDIR) 0001-timeconst.pl-Eliminate-Perl-warning.patch.conditional ; \
  235. fi
  236. endef
  237. LINUX_POST_PATCH_HOOKS += LINUX_TRY_PATCH_TIMECONST
  238. LINUX_KERNEL_CUSTOM_LOGO_PATH = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_LOGO_PATH))
  239. ifneq ($(LINUX_KERNEL_CUSTOM_LOGO_PATH),)
  240. LINUX_DEPENDENCIES += host-imagemagick
  241. define LINUX_KERNEL_CUSTOM_LOGO_CONVERT
  242. $(HOST_DIR)/bin/convert $(LINUX_KERNEL_CUSTOM_LOGO_PATH) \
  243. -dither None -colors 224 -compress none \
  244. $(LINUX_DIR)/drivers/video/logo/logo_linux_clut224.ppm
  245. endef
  246. LINUX_PRE_BUILD_HOOKS += LINUX_KERNEL_CUSTOM_LOGO_CONVERT
  247. endif
  248. ifeq ($(BR2_LINUX_KERNEL_USE_DEFCONFIG),y)
  249. LINUX_KCONFIG_DEFCONFIG = $(call qstrip,$(BR2_LINUX_KERNEL_DEFCONFIG))_defconfig
  250. else ifeq ($(BR2_LINUX_KERNEL_USE_ARCH_DEFAULT_CONFIG),y)
  251. LINUX_KCONFIG_DEFCONFIG = defconfig
  252. else ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG),y)
  253. LINUX_KCONFIG_FILE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE))
  254. endif
  255. LINUX_KCONFIG_FRAGMENT_FILES = $(call qstrip,$(BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES))
  256. LINUX_KCONFIG_EDITORS = menuconfig xconfig gconfig nconfig
  257. # LINUX_MAKE_FLAGS overrides HOSTCC to allow the kernel build to find
  258. # our host-openssl and host-libelf. However, this triggers a bug in
  259. # the kconfig build script that causes it to build with
  260. # /usr/include/ncurses.h (which is typically wchar) but link with
  261. # $(HOST_DIR)/lib/libncurses.so (which is not). We don't actually
  262. # need any host-package for kconfig, so remove the HOSTCC override
  263. # again. In addition, even though linux depends on the toolchain and
  264. # therefore host-ccache would be ready, we use HOSTCC_NOCCACHE for
  265. # consistency with other kconfig packages.
  266. LINUX_KCONFIG_OPTS = $(LINUX_MAKE_FLAGS) HOSTCC="$(HOSTCC_NOCCACHE)"
  267. # If no package has yet set it, set it from the Kconfig option
  268. LINUX_NEEDS_MODULES ?= $(BR2_LINUX_NEEDS_MODULES)
  269. # Make sure the Linux kernel is built with the right endianness. Not
  270. # all architectures support
  271. # CONFIG_CPU_BIG_ENDIAN/CONFIG_CPU_LITTLE_ENDIAN in Linux, but the
  272. # option will be thrown away and ignored if it doesn't exist.
  273. ifeq ($(BR2_ENDIAN),"BIG")
  274. define LINUX_FIXUP_CONFIG_ENDIANNESS
  275. $(call KCONFIG_ENABLE_OPT,CONFIG_CPU_BIG_ENDIAN)
  276. endef
  277. else
  278. define LINUX_FIXUP_CONFIG_ENDIANNESS
  279. $(call KCONFIG_ENABLE_OPT,CONFIG_CPU_LITTLE_ENDIAN)
  280. endef
  281. endif
  282. define LINUX_KCONFIG_FIXUP_CMDS
  283. $(if $(LINUX_NEEDS_MODULES),
  284. $(call KCONFIG_ENABLE_OPT,CONFIG_MODULES))
  285. $(call KCONFIG_ENABLE_OPT,$(strip $(LINUX_COMPRESSION_OPT_y)))
  286. $(foreach opt, $(LINUX_COMPRESSION_OPT_),
  287. $(call KCONFIG_DISABLE_OPT,$(opt))
  288. )
  289. $(LINUX_FIXUP_CONFIG_ENDIANNESS)
  290. $(if $(BR2_arm)$(BR2_armeb),
  291. $(call KCONFIG_ENABLE_OPT,CONFIG_AEABI))
  292. $(if $(BR2_powerpc)$(BR2_powerpc64)$(BR2_powerpc64le),
  293. $(call KCONFIG_ENABLE_OPT,CONFIG_PPC_DISABLE_WERROR))
  294. $(if $(BR2_ARC_PAGE_SIZE_4K),
  295. $(call KCONFIG_ENABLE_OPT,CONFIG_ARC_PAGE_SIZE_4K)
  296. $(call KCONFIG_DISABLE_OPT,CONFIG_ARC_PAGE_SIZE_8K)
  297. $(call KCONFIG_DISABLE_OPT,CONFIG_ARC_PAGE_SIZE_16K))
  298. $(if $(BR2_ARC_PAGE_SIZE_8K),
  299. $(call KCONFIG_DISABLE_OPT,CONFIG_ARC_PAGE_SIZE_4K)
  300. $(call KCONFIG_ENABLE_OPT,CONFIG_ARC_PAGE_SIZE_8K)
  301. $(call KCONFIG_DISABLE_OPT,CONFIG_ARC_PAGE_SIZE_16K))
  302. $(if $(BR2_ARC_PAGE_SIZE_16K),
  303. $(call KCONFIG_DISABLE_OPT,CONFIG_ARC_PAGE_SIZE_4K)
  304. $(call KCONFIG_DISABLE_OPT,CONFIG_ARC_PAGE_SIZE_8K)
  305. $(call KCONFIG_ENABLE_OPT,CONFIG_ARC_PAGE_SIZE_16K))
  306. $(if $(BR2_TARGET_ROOTFS_CPIO),
  307. $(call KCONFIG_ENABLE_OPT,CONFIG_BLK_DEV_INITRD))
  308. # As the kernel gets compiled before root filesystems are
  309. # built, we create a fake cpio file. It'll be
  310. # replaced later by the real cpio archive, and the kernel will be
  311. # rebuilt using the linux-rebuild-with-initramfs target.
  312. $(if $(BR2_TARGET_ROOTFS_INITRAMFS),
  313. mkdir -p $(BINARIES_DIR)
  314. touch $(BINARIES_DIR)/rootfs.cpio
  315. $(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_SOURCE,"$${BR_BINARIES_DIR}/rootfs.cpio")
  316. $(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_ROOT_UID,0)
  317. $(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_ROOT_GID,0))
  318. $(if $(BR2_ROOTFS_DEVICE_CREATION_STATIC),,
  319. $(call KCONFIG_ENABLE_OPT,CONFIG_DEVTMPFS)
  320. $(call KCONFIG_ENABLE_OPT,CONFIG_DEVTMPFS_MOUNT))
  321. $(if $(BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_EUDEV),
  322. $(call KCONFIG_ENABLE_OPT,CONFIG_INOTIFY_USER))
  323. $(if $(BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_MDEV),
  324. $(call KCONFIG_ENABLE_OPT,CONFIG_NET))
  325. $(if $(BR2_LINUX_KERNEL_APPENDED_DTB),
  326. $(call KCONFIG_ENABLE_OPT,CONFIG_ARM_APPENDED_DTB))
  327. $(if $(LINUX_KERNEL_CUSTOM_LOGO_PATH),
  328. $(call KCONFIG_ENABLE_OPT,CONFIG_FB)
  329. $(call KCONFIG_ENABLE_OPT,CONFIG_LOGO)
  330. $(call KCONFIG_ENABLE_OPT,CONFIG_LOGO_LINUX_CLUT224))
  331. $(call KCONFIG_DISABLE_OPT,CONFIG_GCC_PLUGINS)
  332. $(PACKAGES_LINUX_CONFIG_FIXUPS)
  333. endef
  334. ifeq ($(BR2_LINUX_KERNEL_DTS_SUPPORT),y)
  335. # Starting with 4.17, the generated dtc parser code is no longer
  336. # shipped with the kernel sources, so we need flex and bison. For
  337. # reproducibility, we use our owns rather than the host ones.
  338. LINUX_DEPENDENCIES += host-bison host-flex
  339. ifeq ($(BR2_LINUX_KERNEL_DTB_IS_SELF_BUILT),)
  340. define LINUX_BUILD_DTB
  341. $(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(LINUX_DTBS)
  342. endef
  343. ifeq ($(BR2_LINUX_KERNEL_APPENDED_DTB),)
  344. define LINUX_INSTALL_DTB
  345. # dtbs moved from arch/<ARCH>/boot to arch/<ARCH>/boot/dts since 3.8-rc1
  346. $(foreach dtb,$(LINUX_DTBS), \
  347. install -D \
  348. $(or $(wildcard $(LINUX_ARCH_PATH)/boot/dts/$(dtb)),$(LINUX_ARCH_PATH)/boot/$(dtb)) \
  349. $(1)/$(if $(BR2_LINUX_KERNEL_DTB_KEEP_DIRNAME),$(dtb),$(notdir $(dtb)))
  350. )
  351. endef
  352. endif # BR2_LINUX_KERNEL_APPENDED_DTB
  353. endif # BR2_LINUX_KERNEL_DTB_IS_SELF_BUILT
  354. endif # BR2_LINUX_KERNEL_DTS_SUPPORT
  355. ifeq ($(BR2_LINUX_KERNEL_APPENDED_DTB),y)
  356. # dtbs moved from arch/$ARCH/boot to arch/$ARCH/boot/dts since 3.8-rc1
  357. define LINUX_APPEND_DTB
  358. (cd $(LINUX_ARCH_PATH)/boot; \
  359. for dtb in $(LINUX_DTS_NAME); do \
  360. if test -e $${dtb}.dtb ; then \
  361. dtbpath=$${dtb}.dtb ; \
  362. else \
  363. dtbpath=dts/$${dtb}.dtb ; \
  364. fi ; \
  365. cat zImage $${dtbpath} > zImage.$${dtb} || exit 1; \
  366. done)
  367. endef
  368. ifeq ($(BR2_LINUX_KERNEL_APPENDED_UIMAGE),y)
  369. # We need to generate a new u-boot image that takes into
  370. # account the extra-size added by the device tree at the end
  371. # of the image. To do so, we first need to retrieve both load
  372. # address and entry point for the kernel from the already
  373. # generate uboot image before using mkimage -l.
  374. LINUX_APPEND_DTB += ; \
  375. MKIMAGE_ARGS=`$(MKIMAGE) -l $(LINUX_IMAGE_PATH) |\
  376. sed -n -e 's/Image Name:[ ]*\(.*\)/-n \1/p' -e 's/Load Address:/-a/p' -e 's/Entry Point:/-e/p'`; \
  377. for dtb in $(LINUX_DTS_NAME); do \
  378. $(MKIMAGE) -A $(MKIMAGE_ARCH) -O linux \
  379. -T kernel -C none $${MKIMAGE_ARGS} \
  380. -d $(LINUX_ARCH_PATH)/boot/zImage.$${dtb} $(LINUX_IMAGE_PATH).$${dtb}; \
  381. done
  382. endif
  383. endif
  384. # Compilation. We make sure the kernel gets rebuilt when the
  385. # configuration has changed. We call the 'all' and
  386. # '$(LINUX_TARGET_NAME)' targets separately because calling them in
  387. # the same $(MAKE) invocation has shown to cause parallel build
  388. # issues.
  389. # The call to disable gcc-plugins is a stop-gap measure:
  390. # http://lists.busybox.net/pipermail/buildroot/2020-May/282727.html
  391. define LINUX_BUILD_CMDS
  392. $(call KCONFIG_DISABLE_OPT,CONFIG_GCC_PLUGINS)
  393. $(foreach dts,$(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_DTS_PATH)), \
  394. cp -f $(dts) $(LINUX_ARCH_PATH)/boot/dts/
  395. )
  396. $(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) all
  397. $(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(LINUX_TARGET_NAME)
  398. $(LINUX_BUILD_DTB)
  399. $(LINUX_APPEND_DTB)
  400. endef
  401. ifeq ($(BR2_LINUX_KERNEL_APPENDED_DTB),y)
  402. # When a DTB was appended, install the potential several images with
  403. # appended DTBs.
  404. define LINUX_INSTALL_IMAGE
  405. mkdir -p $(1)
  406. cp $(LINUX_ARCH_PATH)/boot/$(LINUX_IMAGE_NAME).* $(1)
  407. endef
  408. else
  409. # Otherwise, just install the unique image generated by the kernel
  410. # build process.
  411. define LINUX_INSTALL_IMAGE
  412. $(INSTALL) -m 0644 -D $(LINUX_IMAGE_PATH) $(1)/$(notdir $(LINUX_IMAGE_NAME))
  413. endef
  414. endif
  415. ifeq ($(BR2_LINUX_KERNEL_INSTALL_TARGET),y)
  416. define LINUX_INSTALL_KERNEL_IMAGE_TO_TARGET
  417. $(call LINUX_INSTALL_IMAGE,$(TARGET_DIR)/boot)
  418. $(call LINUX_INSTALL_DTB,$(TARGET_DIR)/boot)
  419. endef
  420. endif
  421. define LINUX_INSTALL_HOST_TOOLS
  422. # Installing dtc (device tree compiler) as host tool, if selected
  423. if grep -q "CONFIG_DTC=y" $(@D)/.config; then \
  424. $(INSTALL) -D -m 0755 $(@D)/scripts/dtc/dtc $(HOST_DIR)/bin/linux-dtc ; \
  425. $(if $(BR2_PACKAGE_HOST_DTC),,ln -sf linux-dtc $(HOST_DIR)/bin/dtc;) \
  426. fi
  427. endef
  428. define LINUX_INSTALL_IMAGES_CMDS
  429. $(call LINUX_INSTALL_IMAGE,$(BINARIES_DIR))
  430. $(call LINUX_INSTALL_DTB,$(BINARIES_DIR))
  431. endef
  432. ifeq ($(BR2_STRIP_strip),y)
  433. LINUX_MAKE_FLAGS += INSTALL_MOD_STRIP=1
  434. endif
  435. define LINUX_INSTALL_TARGET_CMDS
  436. $(LINUX_INSTALL_KERNEL_IMAGE_TO_TARGET)
  437. # Install modules and remove symbolic links pointing to build
  438. # directories, not relevant on the target
  439. @if grep -q "CONFIG_MODULES=y" $(@D)/.config; then \
  440. $(LINUX_MAKE_ENV) $(MAKE1) $(LINUX_MAKE_FLAGS) -C $(@D) modules_install; \
  441. rm -f $(TARGET_DIR)/lib/modules/$(LINUX_VERSION_PROBED)/build ; \
  442. rm -f $(TARGET_DIR)/lib/modules/$(LINUX_VERSION_PROBED)/source ; \
  443. fi
  444. $(LINUX_INSTALL_HOST_TOOLS)
  445. endef
  446. # Run depmod in a target-finalize hook, to encompass modules installed by
  447. # packages.
  448. define LINUX_RUN_DEPMOD
  449. if test -d $(TARGET_DIR)/lib/modules/$(LINUX_VERSION_PROBED) \
  450. && grep -q "CONFIG_MODULES=y" $(LINUX_DIR)/.config; then \
  451. $(HOST_DIR)/sbin/depmod -a -b $(TARGET_DIR) $(LINUX_VERSION_PROBED); \
  452. fi
  453. endef
  454. LINUX_TARGET_FINALIZE_HOOKS += LINUX_RUN_DEPMOD
  455. # Include all our extensions.
  456. #
  457. # Note: our package infrastructure uses the full-path of the last-scanned
  458. # Makefile to determine what package we're currently defining, using the
  459. # last directory component in the path. Additionally, the full path of
  460. # the package directory is also stored in _PKGDIR (e.g. to find patches)
  461. #
  462. # As such, including other Makefiles, like below, before we call one of
  463. # the *-package macros usually doesn't work.
  464. #
  465. # However, by including the in-tree extensions after the ones from the
  466. # br2-external trees, we're back to the situation where the last Makefile
  467. # scanned *is* included from the correct directory.
  468. #
  469. # NOTE: this is very fragile, and extra care must be taken to ensure that
  470. # we always end up with an in-tree included file. That's mostly OK, because
  471. # we do have in-tree linux-extensions.
  472. #
  473. include $(sort $(wildcard $(foreach ext,$(BR2_EXTERNAL_DIRS), \
  474. $(ext)/linux/linux-ext-*.mk)))
  475. include $(sort $(wildcard linux/linux-ext-*.mk))
  476. LINUX_PATCH_DEPENDENCIES += $(foreach ext,$(LINUX_EXTENSIONS),\
  477. $(if $(BR2_LINUX_KERNEL_EXT_$(call UPPERCASE,$(ext))),$(ext)))
  478. LINUX_PRE_PATCH_HOOKS += $(foreach ext,$(LINUX_EXTENSIONS),\
  479. $(if $(BR2_LINUX_KERNEL_EXT_$(call UPPERCASE,$(ext))),\
  480. $(call UPPERCASE,$(ext))_PREPARE_KERNEL))
  481. # Checks to give errors that the user can understand
  482. # When a custom repository has been set, check for the repository version
  483. ifeq ($(BR2_LINUX_KERNEL_CUSTOM_SVN)$(BR2_LINUX_KERNEL_CUSTOM_GIT)$(BR2_LINUX_KERNEL_CUSTOM_HG),y)
  484. ifeq ($(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION)),)
  485. $(error No custom repository version set. Check your BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION setting)
  486. endif
  487. ifeq ($(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_URL)),)
  488. $(error No custom repo URL set. Check your BR2_LINUX_KERNEL_CUSTOM_REPO_URL setting)
  489. endif
  490. endif
  491. ifeq ($(BR_BUILDING),y)
  492. ifeq ($(BR2_LINUX_KERNEL_USE_DEFCONFIG),y)
  493. # We must use the user-supplied kconfig value, because
  494. # LINUX_KCONFIG_DEFCONFIG will at least contain the
  495. # trailing _defconfig
  496. ifeq ($(call qstrip,$(BR2_LINUX_KERNEL_DEFCONFIG)),)
  497. $(error No kernel defconfig name specified, check your BR2_LINUX_KERNEL_DEFCONFIG setting)
  498. endif
  499. endif
  500. ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG),y)
  501. ifeq ($(LINUX_KCONFIG_FILE),)
  502. $(error No kernel configuration file specified, check your BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE setting)
  503. endif
  504. endif
  505. ifeq ($(BR2_LINUX_KERNEL_DTS_SUPPORT):$(strip $(LINUX_DTS_NAME)),y:)
  506. $(error No kernel device tree source specified, check your \
  507. BR2_LINUX_KERNEL_INTREE_DTS_NAME / BR2_LINUX_KERNEL_CUSTOM_DTS_PATH settings)
  508. endif
  509. endif # BR_BUILDING
  510. $(eval $(kconfig-package))
  511. # Support for rebuilding the kernel after the cpio archive has
  512. # been generated.
  513. .PHONY: linux-rebuild-with-initramfs
  514. linux-rebuild-with-initramfs: $(LINUX_DIR)/.stamp_target_installed
  515. linux-rebuild-with-initramfs: $(LINUX_DIR)/.stamp_images_installed
  516. linux-rebuild-with-initramfs: rootfs-cpio
  517. linux-rebuild-with-initramfs:
  518. @$(call MESSAGE,"Rebuilding kernel with initramfs")
  519. # Build the kernel.
  520. $(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(LINUX_DIR) $(LINUX_TARGET_NAME)
  521. $(LINUX_APPEND_DTB)
  522. # Copy the kernel image(s) to its(their) final destination
  523. $(call LINUX_INSTALL_IMAGE,$(BINARIES_DIR))
  524. # If there is a .ub file copy it to the final destination
  525. test ! -f $(LINUX_IMAGE_PATH).ub || cp $(LINUX_IMAGE_PATH).ub $(BINARIES_DIR)