linux.mk 23 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525526527528529530531532533534535536537538539540541542543544545546547548549550551552553554555556557558559560561562563564565566567568569570571572573574575576577578579580581582583584585
  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 ($(BR2_LINUX_KERNEL_LATEST_VERSION),y)
  9. LINUX_LICENSE_FILES = \
  10. COPYING \
  11. LICENSES/preferred/GPL-2.0 \
  12. LICENSES/exceptions/Linux-syscall-note
  13. endif
  14. LINUX_CPE_ID_VENDOR = linux
  15. LINUX_CPE_ID_PRODUCT = linux_kernel
  16. LINUX_CPE_ID_PREFIX = cpe:2.3:o
  17. # Compute LINUX_SOURCE and LINUX_SITE from the configuration
  18. ifeq ($(BR2_LINUX_KERNEL_CUSTOM_TARBALL),y)
  19. LINUX_TARBALL = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_TARBALL_LOCATION))
  20. LINUX_SITE = $(patsubst %/,%,$(dir $(LINUX_TARBALL)))
  21. LINUX_SOURCE = $(notdir $(LINUX_TARBALL))
  22. else ifeq ($(BR2_LINUX_KERNEL_CUSTOM_GIT),y)
  23. LINUX_SITE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_URL))
  24. LINUX_SITE_METHOD = git
  25. else ifeq ($(BR2_LINUX_KERNEL_CUSTOM_HG),y)
  26. LINUX_SITE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_URL))
  27. LINUX_SITE_METHOD = hg
  28. else ifeq ($(BR2_LINUX_KERNEL_CUSTOM_SVN),y)
  29. LINUX_SITE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_URL))
  30. LINUX_SITE_METHOD = svn
  31. else ifeq ($(BR2_LINUX_KERNEL_LATEST_CIP_VERSION)$(BR2_LINUX_KERNEL_LATEST_CIP_RT_VERSION),y)
  32. LINUX_SOURCE = linux-cip-$(LINUX_VERSION).tar.gz
  33. LINUX_SITE = https://git.kernel.org/pub/scm/linux/kernel/git/cip/linux-cip.git/snapshot
  34. else ifneq ($(findstring -rc,$(LINUX_VERSION)),)
  35. # Since 4.12-rc1, -rc kernels are generated from cgit. This also works for
  36. # older -rc kernels.
  37. LINUX_SITE = https://git.kernel.org/torvalds/t
  38. else
  39. LINUX_SOURCE = linux-$(LINUX_VERSION).tar.xz
  40. ifeq ($(findstring x2.6.,x$(LINUX_VERSION)),x2.6.)
  41. LINUX_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v2.6
  42. else
  43. LINUX_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v$(firstword $(subst ., ,$(LINUX_VERSION))).x
  44. endif
  45. endif
  46. ifeq ($(BR2_LINUX_KERNEL)$(BR2_LINUX_KERNEL_LATEST_VERSION),y)
  47. BR_NO_CHECK_HASH_FOR += $(LINUX_SOURCE)
  48. endif
  49. LINUX_PATCHES = $(call qstrip,$(BR2_LINUX_KERNEL_PATCH))
  50. # We have no way to know the hashes for user-supplied patches.
  51. BR_NO_CHECK_HASH_FOR += $(notdir $(LINUX_PATCHES))
  52. # We rely on the generic package infrastructure to download and apply
  53. # remote patches (downloaded from ftp, http or https). For local
  54. # patches, we can't rely on that infrastructure, because there might
  55. # be directories in the patch list (unlike for other packages).
  56. LINUX_PATCH = $(filter ftp://% http://% https://%,$(LINUX_PATCHES))
  57. # while the kernel is built for the target, the build may need various
  58. # host libraries depending on config (and version), so use
  59. # HOST_MAKE_ENV here. In particular, this ensures that our
  60. # host-pkgconf will look for host libraries and not target ones.
  61. LINUX_MAKE_ENV = \
  62. $(HOST_MAKE_ENV) \
  63. BR_BINARIES_DIR=$(BINARIES_DIR)
  64. LINUX_INSTALL_IMAGES = YES
  65. LINUX_DEPENDENCIES = host-kmod \
  66. $(if $(BR2_PACKAGE_INTEL_MICROCODE),intel-microcode) \
  67. $(if $(BR2_PACKAGE_LINUX_FIRMWARE),linux-firmware)
  68. # Starting with 4.16, the generated kconfig paser code is no longer
  69. # shipped with the kernel sources, so we need flex and bison, but
  70. # only if the host does not have them.
  71. LINUX_KCONFIG_DEPENDENCIES = \
  72. $(BR2_BISON_HOST_DEPENDENCY) \
  73. $(BR2_FLEX_HOST_DEPENDENCY)
  74. # Starting with 4.18, the kconfig in the kernel calls the
  75. # cross-compiler to check its capabilities. So we need the
  76. # toolchain before we can call the configurators.
  77. LINUX_KCONFIG_DEPENDENCIES += toolchain
  78. # host tools needed for kernel compression
  79. ifeq ($(BR2_LINUX_KERNEL_LZ4),y)
  80. LINUX_DEPENDENCIES += host-lz4
  81. else ifeq ($(BR2_LINUX_KERNEL_LZMA),y)
  82. LINUX_DEPENDENCIES += host-lzma
  83. else ifeq ($(BR2_LINUX_KERNEL_LZO),y)
  84. LINUX_DEPENDENCIES += host-lzop
  85. else ifeq ($(BR2_LINUX_KERNEL_XZ),y)
  86. LINUX_DEPENDENCIES += host-xz
  87. else ifeq ($(BR2_LINUX_KERNEL_ZSTD),y)
  88. LINUX_DEPENDENCIES += host-zstd
  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_$(BR2_LINUX_KERNEL_XZ) += CONFIG_KERNEL_XZ
  95. LINUX_COMPRESSION_OPT_$(BR2_LINUX_KERNEL_ZSTD) += CONFIG_KERNEL_ZSTD
  96. LINUX_COMPRESSION_OPT_$(BR2_LINUX_KERNEL_UNCOMPRESSED) += CONFIG_KERNEL_UNCOMPRESSED
  97. ifeq ($(BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL),y)
  98. LINUX_DEPENDENCIES += host-openssl
  99. endif
  100. ifeq ($(BR2_LINUX_KERNEL_NEEDS_HOST_LIBELF),y)
  101. LINUX_DEPENDENCIES += host-elfutils host-pkgconf
  102. endif
  103. # If host-uboot-tools is selected by the user, assume it is needed to
  104. # create a custom image
  105. ifeq ($(BR2_PACKAGE_HOST_UBOOT_TOOLS),y)
  106. LINUX_DEPENDENCIES += host-uboot-tools
  107. endif
  108. ifneq ($(ARCH_XTENSA_OVERLAY_FILE),)
  109. define LINUX_XTENSA_OVERLAY_EXTRACT
  110. $(call arch-xtensa-overlay-extract,$(@D),linux)
  111. endef
  112. LINUX_POST_EXTRACT_HOOKS += LINUX_XTENSA_OVERLAY_EXTRACT
  113. LINUX_EXTRA_DOWNLOADS += $(ARCH_XTENSA_OVERLAY_URL)
  114. endif
  115. # We don't want to run depmod after installing the kernel. It's done in a
  116. # target-finalize hook, to encompass modules installed by packages.
  117. LINUX_MAKE_FLAGS = \
  118. HOSTCC="$(HOSTCC) $(HOST_CFLAGS) $(HOST_LDFLAGS)" \
  119. ARCH=$(KERNEL_ARCH) \
  120. INSTALL_MOD_PATH=$(TARGET_DIR) \
  121. CROSS_COMPILE="$(TARGET_CROSS)" \
  122. DEPMOD=$(HOST_DIR)/sbin/depmod
  123. ifeq ($(BR2_REPRODUCIBLE),y)
  124. LINUX_MAKE_ENV += \
  125. KBUILD_BUILD_VERSION=1 \
  126. KBUILD_BUILD_USER=buildroot \
  127. KBUILD_BUILD_HOST=buildroot \
  128. KBUILD_BUILD_TIMESTAMP="$(shell LC_ALL=C date -d @$(SOURCE_DATE_EPOCH))"
  129. endif
  130. # gcc-8 started warning about function aliases that have a
  131. # non-matching prototype. This seems rather useful in general, but it
  132. # causes tons of warnings in the Linux kernel, where we rely on
  133. # abusing those aliases for system call entry points, in order to
  134. # sanitize the arguments passed from user space in registers.
  135. # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82435
  136. ifeq ($(BR2_TOOLCHAIN_GCC_AT_LEAST_8),y)
  137. LINUX_MAKE_ENV += KCFLAGS=-Wno-attribute-alias
  138. endif
  139. ifeq ($(BR2_LINUX_KERNEL_DTB_OVERLAY_SUPPORT),y)
  140. LINUX_MAKE_ENV += DTC_FLAGS=-@
  141. endif
  142. # Get the real Linux version, which tells us where kernel modules are
  143. # going to be installed in the target filesystem.
  144. # Filter out 'w' from MAKEFLAGS, to workaround a bug in make 4.1 (#13141)
  145. LINUX_VERSION_PROBED = `MAKEFLAGS='$(filter-out w,$(MAKEFLAGS))' $(MAKE) $(LINUX_MAKE_FLAGS) -C $(LINUX_DIR) --no-print-directory -s kernelrelease 2>/dev/null`
  146. LINUX_DTS_NAME += $(call qstrip,$(BR2_LINUX_KERNEL_INTREE_DTS_NAME))
  147. # We keep only the .dts files, so that the user can specify both .dts
  148. # and .dtsi files in BR2_LINUX_KERNEL_CUSTOM_DTS_PATH. Both will be
  149. # copied to arch/<arch>/boot/dts, but only the .dts files will
  150. # actually be generated as .dtb.
  151. LINUX_DTS_NAME += $(basename $(filter %.dts,$(notdir $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_DTS_PATH)))))
  152. LINUX_DTBS = $(addsuffix .dtb,$(LINUX_DTS_NAME))
  153. ifeq ($(BR2_LINUX_KERNEL_IMAGE_TARGET_CUSTOM),y)
  154. LINUX_IMAGE_NAME = $(call qstrip,$(BR2_LINUX_KERNEL_IMAGE_NAME))
  155. LINUX_TARGET_NAME = $(call qstrip,$(BR2_LINUX_KERNEL_IMAGE_TARGET_NAME))
  156. ifeq ($(LINUX_IMAGE_NAME),)
  157. LINUX_IMAGE_NAME = $(LINUX_TARGET_NAME)
  158. endif
  159. else
  160. ifeq ($(BR2_LINUX_KERNEL_UIMAGE),y)
  161. LINUX_IMAGE_NAME = uImage
  162. else ifeq ($(BR2_LINUX_KERNEL_APPENDED_UIMAGE),y)
  163. LINUX_IMAGE_NAME = uImage
  164. else ifeq ($(BR2_LINUX_KERNEL_BZIMAGE),y)
  165. LINUX_IMAGE_NAME = bzImage
  166. else ifeq ($(BR2_LINUX_KERNEL_ZIMAGE),y)
  167. LINUX_IMAGE_NAME = zImage
  168. else ifeq ($(BR2_LINUX_KERNEL_ZIMAGE_EPAPR),y)
  169. LINUX_IMAGE_NAME = zImage.epapr
  170. else ifeq ($(BR2_LINUX_KERNEL_APPENDED_ZIMAGE),y)
  171. LINUX_IMAGE_NAME = zImage
  172. else ifeq ($(BR2_LINUX_KERNEL_CUIMAGE),y)
  173. LINUX_IMAGE_NAME = cuImage.$(firstword $(LINUX_DTS_NAME))
  174. else ifeq ($(BR2_LINUX_KERNEL_SIMPLEIMAGE),y)
  175. LINUX_IMAGE_NAME = simpleImage.$(firstword $(LINUX_DTS_NAME))
  176. else ifeq ($(BR2_LINUX_KERNEL_IMAGE),y)
  177. LINUX_IMAGE_NAME = Image
  178. else ifeq ($(BR2_LINUX_KERNEL_IMAGEGZ),y)
  179. LINUX_IMAGE_NAME = Image.gz
  180. else ifeq ($(BR2_LINUX_KERNEL_LINUX_BIN),y)
  181. LINUX_IMAGE_NAME = linux.bin
  182. else ifeq ($(BR2_LINUX_KERNEL_VMLINUX_BIN),y)
  183. LINUX_IMAGE_NAME = vmlinux.bin
  184. else ifeq ($(BR2_LINUX_KERNEL_VMLINUX),y)
  185. LINUX_IMAGE_NAME = vmlinux
  186. else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ),y)
  187. LINUX_IMAGE_NAME = vmlinuz
  188. else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ_BIN),y)
  189. LINUX_IMAGE_NAME = vmlinuz.bin
  190. endif
  191. # The if-else blocks above are all the image types we know of, and all
  192. # come from a Kconfig choice, so we know we have LINUX_IMAGE_NAME set
  193. # to something
  194. LINUX_TARGET_NAME = $(LINUX_IMAGE_NAME)
  195. endif
  196. LINUX_KERNEL_UIMAGE_LOADADDR = $(call qstrip,$(BR2_LINUX_KERNEL_UIMAGE_LOADADDR))
  197. ifneq ($(LINUX_KERNEL_UIMAGE_LOADADDR),)
  198. LINUX_MAKE_FLAGS += LOADADDR="$(LINUX_KERNEL_UIMAGE_LOADADDR)"
  199. endif
  200. # Compute the arch path, since i386 and x86_64 are in arch/x86 and not
  201. # in arch/$(KERNEL_ARCH). Even if the kernel creates symbolic links
  202. # for bzImage, arch/i386 and arch/x86_64 do not exist when copying the
  203. # defconfig file.
  204. ifeq ($(KERNEL_ARCH),i386)
  205. LINUX_ARCH_PATH = $(LINUX_DIR)/arch/x86
  206. else ifeq ($(KERNEL_ARCH),x86_64)
  207. LINUX_ARCH_PATH = $(LINUX_DIR)/arch/x86
  208. else
  209. LINUX_ARCH_PATH = $(LINUX_DIR)/arch/$(KERNEL_ARCH)
  210. endif
  211. ifeq ($(BR2_LINUX_KERNEL_VMLINUX),y)
  212. LINUX_IMAGE_PATH = $(LINUX_DIR)/$(LINUX_IMAGE_NAME)
  213. else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ),y)
  214. LINUX_IMAGE_PATH = $(LINUX_DIR)/$(LINUX_IMAGE_NAME)
  215. else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ_BIN),y)
  216. LINUX_IMAGE_PATH = $(LINUX_DIR)/$(LINUX_IMAGE_NAME)
  217. else
  218. LINUX_IMAGE_PATH = $(LINUX_ARCH_PATH)/boot/$(LINUX_IMAGE_NAME)
  219. endif # BR2_LINUX_KERNEL_VMLINUX
  220. define LINUX_APPLY_LOCAL_PATCHES
  221. for p in $(filter-out ftp://% http://% https://%,$(LINUX_PATCHES)) ; do \
  222. if test -d $$p ; then \
  223. $(APPLY_PATCHES) $(@D) $$p \*.patch || exit 1 ; \
  224. else \
  225. $(APPLY_PATCHES) $(@D) `dirname $$p` `basename $$p` || exit 1; \
  226. fi \
  227. done
  228. endef
  229. LINUX_POST_PATCH_HOOKS += LINUX_APPLY_LOCAL_PATCHES
  230. # Older linux kernels use deprecated perl constructs in timeconst.pl
  231. # that were removed for perl 5.22+ so it breaks on newer distributions
  232. # Try a dry-run patch to see if this applies, if it does go ahead
  233. define LINUX_TRY_PATCH_TIMECONST
  234. @if patch -p1 --dry-run -f -s -d $(@D) <$(LINUX_PKGDIR)/0001-timeconst.pl-Eliminate-Perl-warning.patch.conditional >/dev/null ; then \
  235. $(APPLY_PATCHES) $(@D) $(LINUX_PKGDIR) 0001-timeconst.pl-Eliminate-Perl-warning.patch.conditional ; \
  236. fi
  237. endef
  238. LINUX_POST_PATCH_HOOKS += LINUX_TRY_PATCH_TIMECONST
  239. LINUX_KERNEL_CUSTOM_LOGO_PATH = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_LOGO_PATH))
  240. ifneq ($(LINUX_KERNEL_CUSTOM_LOGO_PATH),)
  241. LINUX_DEPENDENCIES += host-imagemagick
  242. define LINUX_KERNEL_CUSTOM_LOGO_CONVERT
  243. $(HOST_DIR)/bin/convert $(LINUX_KERNEL_CUSTOM_LOGO_PATH) \
  244. -dither None -colors 224 -compress none \
  245. $(LINUX_DIR)/drivers/video/logo/logo_linux_clut224.ppm
  246. endef
  247. LINUX_PRE_BUILD_HOOKS += LINUX_KERNEL_CUSTOM_LOGO_CONVERT
  248. endif
  249. ifeq ($(BR2_LINUX_KERNEL_USE_DEFCONFIG),y)
  250. LINUX_KCONFIG_DEFCONFIG = $(call qstrip,$(BR2_LINUX_KERNEL_DEFCONFIG))_defconfig
  251. else ifeq ($(BR2_LINUX_KERNEL_USE_ARCH_DEFAULT_CONFIG),y)
  252. LINUX_KCONFIG_DEFCONFIG = defconfig
  253. else ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG),y)
  254. LINUX_KCONFIG_FILE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE))
  255. endif
  256. LINUX_KCONFIG_FRAGMENT_FILES = $(call qstrip,$(BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES))
  257. LINUX_KCONFIG_EDITORS = menuconfig xconfig gconfig nconfig
  258. # LINUX_MAKE_FLAGS overrides HOSTCC to allow the kernel build to find
  259. # our host-openssl and host-libelf. However, this triggers a bug in
  260. # the kconfig build script that causes it to build with
  261. # /usr/include/ncurses.h (which is typically wchar) but link with
  262. # $(HOST_DIR)/lib/libncurses.so (which is not). We don't actually
  263. # need any host-package for kconfig, so remove the HOSTCC override
  264. # again. In addition, even though linux depends on the toolchain and
  265. # therefore host-ccache would be ready, we use HOSTCC_NOCCACHE for
  266. # consistency with other kconfig packages.
  267. LINUX_KCONFIG_OPTS = $(LINUX_MAKE_FLAGS) HOSTCC="$(HOSTCC_NOCCACHE)"
  268. # If no package has yet set it, set it from the Kconfig option
  269. LINUX_NEEDS_MODULES ?= $(BR2_LINUX_NEEDS_MODULES)
  270. # Make sure the Linux kernel is built with the right endianness. Not
  271. # all architectures support
  272. # CONFIG_CPU_BIG_ENDIAN/CONFIG_CPU_LITTLE_ENDIAN in Linux, but the
  273. # option will be thrown away and ignored if it doesn't exist.
  274. ifeq ($(BR2_ENDIAN),"BIG")
  275. define LINUX_FIXUP_CONFIG_ENDIANNESS
  276. $(call KCONFIG_ENABLE_OPT,CONFIG_CPU_BIG_ENDIAN)
  277. endef
  278. else
  279. define LINUX_FIXUP_CONFIG_ENDIANNESS
  280. $(call KCONFIG_ENABLE_OPT,CONFIG_CPU_LITTLE_ENDIAN)
  281. endef
  282. endif
  283. define LINUX_KCONFIG_FIXUP_CMDS
  284. $(if $(LINUX_NEEDS_MODULES),
  285. $(call KCONFIG_ENABLE_OPT,CONFIG_MODULES))
  286. $(call KCONFIG_ENABLE_OPT,$(strip $(LINUX_COMPRESSION_OPT_y)))
  287. $(foreach opt, $(LINUX_COMPRESSION_OPT_),
  288. $(call KCONFIG_DISABLE_OPT,$(opt))
  289. )
  290. $(LINUX_FIXUP_CONFIG_ENDIANNESS)
  291. $(if $(BR2_arm)$(BR2_armeb),
  292. $(call KCONFIG_ENABLE_OPT,CONFIG_AEABI))
  293. $(if $(BR2_powerpc)$(BR2_powerpc64)$(BR2_powerpc64le),
  294. $(call KCONFIG_ENABLE_OPT,CONFIG_PPC_DISABLE_WERROR))
  295. $(if $(BR2_ARC_PAGE_SIZE_4K),
  296. $(call KCONFIG_ENABLE_OPT,CONFIG_ARC_PAGE_SIZE_4K)
  297. $(call KCONFIG_DISABLE_OPT,CONFIG_ARC_PAGE_SIZE_8K)
  298. $(call KCONFIG_DISABLE_OPT,CONFIG_ARC_PAGE_SIZE_16K))
  299. $(if $(BR2_ARC_PAGE_SIZE_8K),
  300. $(call KCONFIG_DISABLE_OPT,CONFIG_ARC_PAGE_SIZE_4K)
  301. $(call KCONFIG_ENABLE_OPT,CONFIG_ARC_PAGE_SIZE_8K)
  302. $(call KCONFIG_DISABLE_OPT,CONFIG_ARC_PAGE_SIZE_16K))
  303. $(if $(BR2_ARC_PAGE_SIZE_16K),
  304. $(call KCONFIG_DISABLE_OPT,CONFIG_ARC_PAGE_SIZE_4K)
  305. $(call KCONFIG_DISABLE_OPT,CONFIG_ARC_PAGE_SIZE_8K)
  306. $(call KCONFIG_ENABLE_OPT,CONFIG_ARC_PAGE_SIZE_16K))
  307. $(if $(BR2_TARGET_ROOTFS_CPIO),
  308. $(call KCONFIG_ENABLE_OPT,CONFIG_BLK_DEV_INITRD))
  309. # As the kernel gets compiled before root filesystems are
  310. # built, we create a fake cpio file. It'll be
  311. # replaced later by the real cpio archive, and the kernel will be
  312. # rebuilt using the linux-rebuild-with-initramfs target.
  313. $(if $(BR2_TARGET_ROOTFS_INITRAMFS),
  314. mkdir -p $(BINARIES_DIR)
  315. touch $(BINARIES_DIR)/rootfs.cpio
  316. $(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_SOURCE,"$${BR_BINARIES_DIR}/rootfs.cpio")
  317. $(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_ROOT_UID,0)
  318. $(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_ROOT_GID,0))
  319. $(if $(BR2_ROOTFS_DEVICE_CREATION_STATIC),,
  320. $(call KCONFIG_ENABLE_OPT,CONFIG_DEVTMPFS)
  321. $(call KCONFIG_ENABLE_OPT,CONFIG_DEVTMPFS_MOUNT))
  322. $(if $(BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_EUDEV),
  323. $(call KCONFIG_ENABLE_OPT,CONFIG_INOTIFY_USER))
  324. $(if $(BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_MDEV),
  325. $(call KCONFIG_ENABLE_OPT,CONFIG_NET))
  326. $(if $(BR2_LINUX_KERNEL_APPENDED_DTB),
  327. $(call KCONFIG_ENABLE_OPT,CONFIG_ARM_APPENDED_DTB))
  328. $(if $(LINUX_KERNEL_CUSTOM_LOGO_PATH),
  329. $(call KCONFIG_ENABLE_OPT,CONFIG_FB)
  330. $(call KCONFIG_ENABLE_OPT,CONFIG_LOGO)
  331. $(call KCONFIG_ENABLE_OPT,CONFIG_LOGO_LINUX_CLUT224))
  332. $(call KCONFIG_DISABLE_OPT,CONFIG_GCC_PLUGINS)
  333. $(PACKAGES_LINUX_CONFIG_FIXUPS)
  334. endef
  335. ifeq ($(BR2_LINUX_KERNEL_DTS_SUPPORT),y)
  336. # Starting with 4.17, the generated dtc parser code is no longer
  337. # shipped with the kernel sources, so we need flex and bison. For
  338. # reproducibility, we use our owns rather than the host ones.
  339. LINUX_DEPENDENCIES += host-bison host-flex
  340. ifeq ($(BR2_LINUX_KERNEL_DTB_IS_SELF_BUILT),)
  341. define LINUX_BUILD_DTB
  342. $(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(LINUX_DTBS)
  343. endef
  344. ifeq ($(BR2_LINUX_KERNEL_APPENDED_DTB),)
  345. define LINUX_INSTALL_DTB
  346. # dtbs moved from arch/<ARCH>/boot to arch/<ARCH>/boot/dts since 3.8-rc1
  347. $(foreach dtb,$(LINUX_DTBS), \
  348. install -D \
  349. $(or $(wildcard $(LINUX_ARCH_PATH)/boot/dts/$(dtb)),$(LINUX_ARCH_PATH)/boot/$(dtb)) \
  350. $(1)/$(if $(BR2_LINUX_KERNEL_DTB_KEEP_DIRNAME),$(dtb),$(notdir $(dtb)))
  351. )
  352. endef
  353. endif # BR2_LINUX_KERNEL_APPENDED_DTB
  354. endif # BR2_LINUX_KERNEL_DTB_IS_SELF_BUILT
  355. endif # BR2_LINUX_KERNEL_DTS_SUPPORT
  356. ifeq ($(BR2_LINUX_KERNEL_APPENDED_DTB),y)
  357. # dtbs moved from arch/$ARCH/boot to arch/$ARCH/boot/dts since 3.8-rc1
  358. define LINUX_APPEND_DTB
  359. (cd $(LINUX_ARCH_PATH)/boot; \
  360. for dtb in $(LINUX_DTS_NAME); do \
  361. if test -e $${dtb}.dtb ; then \
  362. dtbpath=$${dtb}.dtb ; \
  363. else \
  364. dtbpath=dts/$${dtb}.dtb ; \
  365. fi ; \
  366. cat zImage $${dtbpath} > zImage.$${dtb} || exit 1; \
  367. done)
  368. endef
  369. ifeq ($(BR2_LINUX_KERNEL_APPENDED_UIMAGE),y)
  370. # We need to generate a new u-boot image that takes into
  371. # account the extra-size added by the device tree at the end
  372. # of the image. To do so, we first need to retrieve both load
  373. # address and entry point for the kernel from the already
  374. # generate uboot image before using mkimage -l.
  375. LINUX_APPEND_DTB += ; \
  376. MKIMAGE_ARGS=`$(MKIMAGE) -l $(LINUX_IMAGE_PATH) |\
  377. sed -n -e 's/Image Name:[ ]*\(.*\)/-n \1/p' -e 's/Load Address:/-a/p' -e 's/Entry Point:/-e/p'`; \
  378. for dtb in $(LINUX_DTS_NAME); do \
  379. $(MKIMAGE) -A $(MKIMAGE_ARCH) -O linux \
  380. -T kernel -C none $${MKIMAGE_ARGS} \
  381. -d $(LINUX_ARCH_PATH)/boot/zImage.$${dtb} $(LINUX_IMAGE_PATH).$${dtb}; \
  382. done
  383. endif
  384. endif
  385. # Compilation. We make sure the kernel gets rebuilt when the
  386. # configuration has changed. We call the 'all' and
  387. # '$(LINUX_TARGET_NAME)' targets separately because calling them in
  388. # the same $(MAKE) invocation has shown to cause parallel build
  389. # issues.
  390. # The call to disable gcc-plugins is a stop-gap measure:
  391. # http://lists.busybox.net/pipermail/buildroot/2020-May/282727.html
  392. define LINUX_BUILD_CMDS
  393. $(call KCONFIG_DISABLE_OPT,CONFIG_GCC_PLUGINS)
  394. $(foreach dts,$(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_DTS_PATH)), \
  395. cp -f $(dts) $(LINUX_ARCH_PATH)/boot/dts/
  396. )
  397. $(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) all
  398. $(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(LINUX_TARGET_NAME)
  399. $(LINUX_BUILD_DTB)
  400. $(LINUX_APPEND_DTB)
  401. endef
  402. ifeq ($(BR2_LINUX_KERNEL_APPENDED_DTB),y)
  403. # When a DTB was appended, install the potential several images with
  404. # appended DTBs.
  405. define LINUX_INSTALL_IMAGE
  406. mkdir -p $(1)
  407. cp $(LINUX_ARCH_PATH)/boot/$(LINUX_IMAGE_NAME).* $(1)
  408. endef
  409. else
  410. # Otherwise, just install the unique image generated by the kernel
  411. # build process.
  412. define LINUX_INSTALL_IMAGE
  413. $(INSTALL) -m 0644 -D $(LINUX_IMAGE_PATH) $(1)/$(notdir $(LINUX_IMAGE_NAME))
  414. endef
  415. endif
  416. ifeq ($(BR2_LINUX_KERNEL_INSTALL_TARGET),y)
  417. define LINUX_INSTALL_KERNEL_IMAGE_TO_TARGET
  418. $(call LINUX_INSTALL_IMAGE,$(TARGET_DIR)/boot)
  419. $(call LINUX_INSTALL_DTB,$(TARGET_DIR)/boot)
  420. endef
  421. endif
  422. define LINUX_INSTALL_HOST_TOOLS
  423. # Installing dtc (device tree compiler) as host tool, if selected
  424. if grep -q "CONFIG_DTC=y" $(@D)/.config; then \
  425. $(INSTALL) -D -m 0755 $(@D)/scripts/dtc/dtc $(HOST_DIR)/bin/linux-dtc ; \
  426. $(if $(BR2_PACKAGE_HOST_DTC),,ln -sf linux-dtc $(HOST_DIR)/bin/dtc;) \
  427. fi
  428. endef
  429. define LINUX_INSTALL_IMAGES_CMDS
  430. $(call LINUX_INSTALL_IMAGE,$(BINARIES_DIR))
  431. $(call LINUX_INSTALL_DTB,$(BINARIES_DIR))
  432. endef
  433. ifeq ($(BR2_STRIP_strip),y)
  434. LINUX_MAKE_FLAGS += INSTALL_MOD_STRIP=1
  435. endif
  436. define LINUX_INSTALL_TARGET_CMDS
  437. $(LINUX_INSTALL_KERNEL_IMAGE_TO_TARGET)
  438. # Install modules and remove symbolic links pointing to build
  439. # directories, not relevant on the target
  440. @if grep -q "CONFIG_MODULES=y" $(@D)/.config; then \
  441. $(LINUX_MAKE_ENV) $(MAKE1) $(LINUX_MAKE_FLAGS) -C $(@D) modules_install; \
  442. rm -f $(TARGET_DIR)/lib/modules/$(LINUX_VERSION_PROBED)/build ; \
  443. rm -f $(TARGET_DIR)/lib/modules/$(LINUX_VERSION_PROBED)/source ; \
  444. fi
  445. $(LINUX_INSTALL_HOST_TOOLS)
  446. endef
  447. # Run depmod in a target-finalize hook, to encompass modules installed by
  448. # packages.
  449. define LINUX_RUN_DEPMOD
  450. if test -d $(TARGET_DIR)/lib/modules/$(LINUX_VERSION_PROBED) \
  451. && grep -q "CONFIG_MODULES=y" $(LINUX_DIR)/.config; then \
  452. $(HOST_DIR)/sbin/depmod -a -b $(TARGET_DIR) $(LINUX_VERSION_PROBED); \
  453. fi
  454. endef
  455. LINUX_TARGET_FINALIZE_HOOKS += LINUX_RUN_DEPMOD
  456. # Include all our extensions.
  457. #
  458. # Note: our package infrastructure uses the full-path of the last-scanned
  459. # Makefile to determine what package we're currently defining, using the
  460. # last directory component in the path. Additionally, the full path of
  461. # the package directory is also stored in _PKGDIR (e.g. to find patches)
  462. #
  463. # As such, including other Makefiles, like below, before we call one of
  464. # the *-package macros usually doesn't work.
  465. #
  466. # However, by including the in-tree extensions after the ones from the
  467. # br2-external trees, we're back to the situation where the last Makefile
  468. # scanned *is* included from the correct directory.
  469. #
  470. # NOTE: this is very fragile, and extra care must be taken to ensure that
  471. # we always end up with an in-tree included file. That's mostly OK, because
  472. # we do have in-tree linux-extensions.
  473. #
  474. include $(sort $(wildcard $(foreach ext,$(BR2_EXTERNAL_DIRS), \
  475. $(ext)/linux/linux-ext-*.mk)))
  476. include $(sort $(wildcard linux/linux-ext-*.mk))
  477. LINUX_PATCH_DEPENDENCIES += $(foreach ext,$(LINUX_EXTENSIONS),\
  478. $(if $(BR2_LINUX_KERNEL_EXT_$(call UPPERCASE,$(ext))),$(ext)))
  479. LINUX_PRE_PATCH_HOOKS += $(foreach ext,$(LINUX_EXTENSIONS),\
  480. $(if $(BR2_LINUX_KERNEL_EXT_$(call UPPERCASE,$(ext))),\
  481. $(call UPPERCASE,$(ext))_PREPARE_KERNEL))
  482. # Checks to give errors that the user can understand
  483. # When a custom repository has been set, check for the repository version
  484. ifeq ($(BR2_LINUX_KERNEL_CUSTOM_SVN)$(BR2_LINUX_KERNEL_CUSTOM_GIT)$(BR2_LINUX_KERNEL_CUSTOM_HG),y)
  485. ifeq ($(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION)),)
  486. $(error No custom repository version set. Check your BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION setting)
  487. endif
  488. ifeq ($(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_URL)),)
  489. $(error No custom repo URL set. Check your BR2_LINUX_KERNEL_CUSTOM_REPO_URL setting)
  490. endif
  491. endif
  492. ifeq ($(BR_BUILDING),y)
  493. ifeq ($(BR2_LINUX_KERNEL_USE_DEFCONFIG),y)
  494. # We must use the user-supplied kconfig value, because
  495. # LINUX_KCONFIG_DEFCONFIG will at least contain the
  496. # trailing _defconfig
  497. ifeq ($(call qstrip,$(BR2_LINUX_KERNEL_DEFCONFIG)),)
  498. $(error No kernel defconfig name specified, check your BR2_LINUX_KERNEL_DEFCONFIG setting)
  499. endif
  500. endif
  501. ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG),y)
  502. ifeq ($(LINUX_KCONFIG_FILE),)
  503. $(error No kernel configuration file specified, check your BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE setting)
  504. endif
  505. endif
  506. ifeq ($(BR2_LINUX_KERNEL_DTS_SUPPORT):$(strip $(LINUX_DTS_NAME)),y:)
  507. $(error No kernel device tree source specified, check your \
  508. BR2_LINUX_KERNEL_INTREE_DTS_NAME / BR2_LINUX_KERNEL_CUSTOM_DTS_PATH settings)
  509. endif
  510. endif # BR_BUILDING
  511. $(eval $(kconfig-package))
  512. # Support for rebuilding the kernel after the cpio archive has
  513. # been generated.
  514. .PHONY: linux-rebuild-with-initramfs
  515. linux-rebuild-with-initramfs: $(LINUX_DIR)/.stamp_target_installed
  516. linux-rebuild-with-initramfs: $(LINUX_DIR)/.stamp_images_installed
  517. linux-rebuild-with-initramfs: rootfs-cpio
  518. linux-rebuild-with-initramfs:
  519. @$(call MESSAGE,"Rebuilding kernel with initramfs")
  520. # Build the kernel.
  521. $(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(LINUX_DIR) $(LINUX_TARGET_NAME)
  522. $(LINUX_APPEND_DTB)
  523. # Copy the kernel image(s) to its(their) final destination
  524. $(call LINUX_INSTALL_IMAGE,$(BINARIES_DIR))
  525. # If there is a .ub file copy it to the final destination
  526. test ! -f $(LINUX_IMAGE_PATH).ub || cp $(LINUX_IMAGE_PATH).ub $(BINARIES_DIR)