linux.mk 13 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341
  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. # Compute LINUX_SOURCE and LINUX_SITE from the configuration
  10. ifeq ($(LINUX_VERSION),custom)
  11. LINUX_TARBALL = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_TARBALL_LOCATION))
  12. LINUX_SITE = $(patsubst %/,%,$(dir $(LINUX_TARBALL)))
  13. LINUX_SOURCE = $(notdir $(LINUX_TARBALL))
  14. else ifeq ($(BR2_LINUX_KERNEL_CUSTOM_GIT),y)
  15. LINUX_SITE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_GIT_REPO_URL))
  16. LINUX_SITE_METHOD = git
  17. else
  18. LINUX_SOURCE = linux-$(LINUX_VERSION).tar.xz
  19. # In X.Y.Z, get X and Y. We replace dots and dashes by spaces in order
  20. # to use the $(word) function. We support versions such as 3.1,
  21. # 2.6.32, 2.6.32-rc1, 3.0-rc6, etc.
  22. ifeq ($(findstring x2.6.,x$(LINUX_VERSION)),x2.6.)
  23. LINUX_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v2.6/
  24. else
  25. LINUX_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v3.x/
  26. endif
  27. # release candidates are in testing/ subdir
  28. ifneq ($(findstring -rc,$(LINUX_VERSION)),)
  29. LINUX_SITE := $(LINUX_SITE)testing/
  30. endif # -rc
  31. endif
  32. LINUX_PATCHES = $(call qstrip,$(BR2_LINUX_KERNEL_PATCH))
  33. LINUX_INSTALL_IMAGES = YES
  34. LINUX_DEPENDENCIES += host-module-init-tools host-lzop
  35. ifeq ($(BR2_LINUX_KERNEL_UBOOT_IMAGE),y)
  36. LINUX_DEPENDENCIES += host-uboot-tools
  37. endif
  38. LINUX_MAKE_FLAGS = \
  39. HOSTCC="$(HOSTCC)" \
  40. HOSTCFLAGS="$(HOSTCFLAGS)" \
  41. ARCH=$(KERNEL_ARCH) \
  42. INSTALL_MOD_PATH=$(TARGET_DIR) \
  43. CROSS_COMPILE="$(CCACHE) $(TARGET_CROSS)" \
  44. DEPMOD=$(HOST_DIR)/usr/sbin/depmod
  45. # Get the real Linux version, which tells us where kernel modules are
  46. # going to be installed in the target filesystem.
  47. LINUX_VERSION_PROBED = $(shell $(MAKE) $(LINUX_MAKE_FLAGS) -C $(LINUX_DIR) --no-print-directory -s kernelrelease)
  48. ifeq ($(BR2_LINUX_KERNEL_USE_INTREE_DTS),y)
  49. KERNEL_DTS_NAME = $(call qstrip,$(BR2_LINUX_KERNEL_INTREE_DTS_NAME))
  50. else ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_DTS),y)
  51. KERNEL_DTS_NAME = $(basename $(notdir $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_DTS_PATH))))
  52. endif
  53. ifeq ($(BR2_LINUX_KERNEL_DTS_SUPPORT)$(KERNEL_DTS_NAME),y)
  54. $(error No kernel device tree source specified, check your \
  55. BR2_LINUX_KERNEL_USE_INTREE_DTS / BR2_LINUX_KERNEL_USE_CUSTOM_DTS settings)
  56. endif
  57. ifeq ($(BR2_LINUX_KERNEL_APPENDED_DTB),y)
  58. ifneq ($(words $(KERNEL_DTS_NAME)),1)
  59. $(error Kernel with appended device tree needs exactly one DTS source.\
  60. Check BR2_LINUX_KERNEL_INTREE_DTS_NAME or BR2_LINUX_KERNEL_CUSTOM_DTS_PATH.)
  61. endif
  62. endif
  63. KERNEL_DTBS = $(addsuffix .dtb,$(KERNEL_DTS_NAME))
  64. ifeq ($(BR2_LINUX_KERNEL_IMAGE_TARGET_CUSTOM),y)
  65. LINUX_IMAGE_NAME=$(call qstrip,$(BR2_LINUX_KERNEL_IMAGE_TARGET_NAME))
  66. else
  67. ifeq ($(BR2_LINUX_KERNEL_UIMAGE),y)
  68. LINUX_IMAGE_NAME=uImage
  69. else ifeq ($(BR2_LINUX_KERNEL_APPENDED_UIMAGE),y)
  70. LINUX_IMAGE_NAME=uImage
  71. else ifeq ($(BR2_LINUX_KERNEL_BZIMAGE),y)
  72. LINUX_IMAGE_NAME=bzImage
  73. else ifeq ($(BR2_LINUX_KERNEL_ZIMAGE),y)
  74. LINUX_IMAGE_NAME=zImage
  75. else ifeq ($(BR2_LINUX_KERNEL_APPENDED_ZIMAGE),y)
  76. LINUX_IMAGE_NAME=zImage
  77. else ifeq ($(BR2_LINUX_KERNEL_CUIMAGE),y)
  78. LINUX_IMAGE_NAME=cuImage.$(KERNEL_DTS_NAME)
  79. else ifeq ($(BR2_LINUX_KERNEL_SIMPLEIMAGE),y)
  80. LINUX_IMAGE_NAME=simpleImage.$(KERNEL_DTS_NAME)
  81. else ifeq ($(BR2_LINUX_KERNEL_LINUX_BIN),y)
  82. LINUX_IMAGE_NAME=linux.bin
  83. else ifeq ($(BR2_LINUX_KERNEL_VMLINUX_BIN),y)
  84. LINUX_IMAGE_NAME=vmlinux.bin
  85. else ifeq ($(BR2_LINUX_KERNEL_VMLINUX),y)
  86. LINUX_IMAGE_NAME=vmlinux
  87. else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ),y)
  88. LINUX_IMAGE_NAME=vmlinuz
  89. endif
  90. endif
  91. LINUX_KERNEL_UIMAGE_LOADADDR=$(call qstrip,$(BR2_LINUX_KERNEL_UIMAGE_LOADADDR))
  92. ifneq ($(LINUX_KERNEL_UIMAGE_LOADADDR),)
  93. LINUX_MAKE_FLAGS+=LOADADDR="$(LINUX_KERNEL_UIMAGE_LOADADDR)"
  94. endif
  95. # Compute the arch path, since i386 and x86_64 are in arch/x86 and not
  96. # in arch/$(KERNEL_ARCH). Even if the kernel creates symbolic links
  97. # for bzImage, arch/i386 and arch/x86_64 do not exist when copying the
  98. # defconfig file.
  99. ifeq ($(KERNEL_ARCH),i386)
  100. KERNEL_ARCH_PATH=$(LINUX_DIR)/arch/x86
  101. else ifeq ($(KERNEL_ARCH),x86_64)
  102. KERNEL_ARCH_PATH=$(LINUX_DIR)/arch/x86
  103. else
  104. KERNEL_ARCH_PATH=$(LINUX_DIR)/arch/$(KERNEL_ARCH)
  105. endif
  106. ifeq ($(BR2_LINUX_KERNEL_VMLINUX),y)
  107. LINUX_IMAGE_PATH=$(LINUX_DIR)/$(LINUX_IMAGE_NAME)
  108. else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ),y)
  109. LINUX_IMAGE_PATH=$(LINUX_DIR)/$(LINUX_IMAGE_NAME)
  110. else
  111. ifeq ($(KERNEL_ARCH),avr32)
  112. LINUX_IMAGE_PATH=$(KERNEL_ARCH_PATH)/boot/images/$(LINUX_IMAGE_NAME)
  113. else
  114. LINUX_IMAGE_PATH=$(KERNEL_ARCH_PATH)/boot/$(LINUX_IMAGE_NAME)
  115. endif
  116. endif # BR2_LINUX_KERNEL_VMLINUX
  117. define LINUX_DOWNLOAD_PATCHES
  118. $(if $(LINUX_PATCHES),
  119. @$(call MESSAGE,"Download additional patches"))
  120. $(foreach patch,$(filter ftp://% http://%,$(LINUX_PATCHES)),\
  121. $(call DOWNLOAD,$(patch))$(sep))
  122. endef
  123. LINUX_POST_DOWNLOAD_HOOKS += LINUX_DOWNLOAD_PATCHES
  124. define LINUX_APPLY_PATCHES
  125. for p in $(LINUX_PATCHES) ; do \
  126. if echo $$p | grep -q -E "^ftp://|^http://" ; then \
  127. support/scripts/apply-patches.sh $(@D) $(DL_DIR) `basename $$p` ; \
  128. elif test -d $$p ; then \
  129. support/scripts/apply-patches.sh $(@D) $$p linux-\*.patch ; \
  130. else \
  131. support/scripts/apply-patches.sh $(@D) `dirname $$p` `basename $$p` ; \
  132. fi \
  133. done
  134. endef
  135. LINUX_POST_PATCH_HOOKS += LINUX_APPLY_PATCHES
  136. ifeq ($(BR2_LINUX_KERNEL_USE_DEFCONFIG),y)
  137. KERNEL_SOURCE_CONFIG = $(KERNEL_ARCH_PATH)/configs/$(call qstrip,$(BR2_LINUX_KERNEL_DEFCONFIG))_defconfig
  138. else ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG),y)
  139. KERNEL_SOURCE_CONFIG = $(BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE)
  140. endif
  141. define LINUX_CONFIGURE_CMDS
  142. cp $(KERNEL_SOURCE_CONFIG) $(KERNEL_ARCH_PATH)/configs/buildroot_defconfig
  143. $(TARGET_MAKE_ENV) $(MAKE1) $(LINUX_MAKE_FLAGS) -C $(@D) buildroot_defconfig
  144. rm $(KERNEL_ARCH_PATH)/configs/buildroot_defconfig
  145. $(if $(BR2_arm)$(BR2_armeb),
  146. $(call KCONFIG_ENABLE_OPT,CONFIG_AEABI,$(@D)/.config))
  147. # As the kernel gets compiled before root filesystems are
  148. # built, we create a fake cpio file. It'll be
  149. # replaced later by the real cpio archive, and the kernel will be
  150. # rebuilt using the linux26-rebuild-with-initramfs target.
  151. $(if $(BR2_TARGET_ROOTFS_INITRAMFS),
  152. touch $(BINARIES_DIR)/rootfs.cpio
  153. $(call KCONFIG_ENABLE_OPT,CONFIG_BLK_DEV_INITRD,$(@D)/.config)
  154. $(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_SOURCE,\"$(BINARIES_DIR)/rootfs.cpio\",$(@D)/.config)
  155. $(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_ROOT_UID,0,$(@D)/.config)
  156. $(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_ROOT_GID,0,$(@D)/.config))
  157. $(if $(BR2_ROOTFS_DEVICE_CREATION_STATIC),,
  158. $(call KCONFIG_ENABLE_OPT,CONFIG_DEVTMPFS,$(@D)/.config)
  159. $(call KCONFIG_ENABLE_OPT,CONFIG_DEVTMPFS_MOUNT,$(@D)/.config))
  160. $(if $(BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_MDEV),
  161. $(call KCONFIG_SET_OPT,CONFIG_UEVENT_HELPER_PATH,\"/sbin/mdev\",$(@D)/.config))
  162. $(if $(BR2_PACKAGE_SYSTEMD),
  163. $(call KCONFIG_ENABLE_OPT,CONFIG_CGROUPS,$(@D)/.config))
  164. $(if $(BR2_LINUX_KERNEL_APPENDED_DTB),
  165. $(call KCONFIG_ENABLE_OPT,CONFIG_ARM_APPENDED_DTB,$(@D)/.config))
  166. yes '' | $(TARGET_MAKE_ENV) $(MAKE1) $(LINUX_MAKE_FLAGS) -C $(@D) oldconfig
  167. endef
  168. ifeq ($(BR2_LINUX_KERNEL_DTS_SUPPORT),y)
  169. ifeq ($(BR2_LINUX_KERNEL_DTB_IS_SELF_BUILT),)
  170. define LINUX_BUILD_DTB
  171. $(TARGET_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(KERNEL_DTBS)
  172. endef
  173. define LINUX_INSTALL_DTB
  174. # dtbs moved from arch/<ARCH>/boot to arch/<ARCH>/boot/dts since 3.8-rc1
  175. cp $(addprefix \
  176. $(KERNEL_ARCH_PATH)/boot/$(if $(wildcard \
  177. $(addprefix $(KERNEL_ARCH_PATH)/boot/dts/,$(KERNEL_DTBS))),dts/),$(KERNEL_DTBS)) \
  178. $(BINARIES_DIR)/
  179. endef
  180. define LINUX_INSTALL_DTB_TARGET
  181. # dtbs moved from arch/<ARCH>/boot to arch/<ARCH>/boot/dts since 3.8-rc1
  182. cp $(addprefix \
  183. $(KERNEL_ARCH_PATH)/boot/$(if $(wildcard \
  184. $(addprefix $(KERNEL_ARCH_PATH)/boot/dts/,$(KERNEL_DTBS))),dts/),$(KERNEL_DTBS)) \
  185. $(TARGET_DIR)/boot/
  186. endef
  187. endif
  188. endif
  189. ifeq ($(BR2_LINUX_KERNEL_APPENDED_DTB),y)
  190. # dtbs moved from arch/$ARCH/boot to arch/$ARCH/boot/dts since 3.8-rc1
  191. define LINUX_APPEND_DTB
  192. if [ -e $(KERNEL_ARCH_PATH)/boot/$(KERNEL_DTS_NAME).dtb ]; then \
  193. cat $(KERNEL_ARCH_PATH)/boot/$(KERNEL_DTS_NAME).dtb; \
  194. else \
  195. cat $(KERNEL_ARCH_PATH)/boot/dts/$(KERNEL_DTS_NAME).dtb; \
  196. fi >> $(KERNEL_ARCH_PATH)/boot/zImage
  197. endef
  198. ifeq ($(BR2_LINUX_KERNEL_APPENDED_UIMAGE),y)
  199. # We need to generate a new u-boot image that takes into
  200. # account the extra-size added by the device tree at the end
  201. # of the image. To do so, we first need to retrieve both load
  202. # address and entry point for the kernel from the already
  203. # generate uboot image before using mkimage -l.
  204. LINUX_APPEND_DTB += $(sep) MKIMAGE_ARGS=`$(HOST_DIR)/usr/bin/mkimage -l $(LINUX_IMAGE_PATH) |\
  205. sed -n -e 's/Image Name:[ ]*\(.*\)/-n \1/p' -e 's/Load Address:/-a/p' -e 's/Entry Point:/-e/p'`; \
  206. $(HOST_DIR)/usr/bin/mkimage -A $(KERNEL_ARCH) -O linux \
  207. -T kernel -C none $${MKIMAGE_ARGS} \
  208. -d $(KERNEL_ARCH_PATH)/boot/zImage $(LINUX_IMAGE_PATH);
  209. endif
  210. endif
  211. # Compilation. We make sure the kernel gets rebuilt when the
  212. # configuration has changed.
  213. define LINUX_BUILD_CMDS
  214. $(if $(BR2_LINUX_KERNEL_USE_CUSTOM_DTS),
  215. cp $(BR2_LINUX_KERNEL_CUSTOM_DTS_PATH) $(KERNEL_ARCH_PATH)/boot/dts/)
  216. $(TARGET_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(LINUX_IMAGE_NAME)
  217. @if grep -q "CONFIG_MODULES=y" $(@D)/.config; then \
  218. $(TARGET_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) modules ; \
  219. fi
  220. $(LINUX_BUILD_DTB)
  221. $(LINUX_APPEND_DTB)
  222. endef
  223. ifeq ($(BR2_LINUX_KERNEL_INSTALL_TARGET),y)
  224. define LINUX_INSTALL_KERNEL_IMAGE_TO_TARGET
  225. install -m 0644 -D $(LINUX_IMAGE_PATH) $(TARGET_DIR)/boot/$(LINUX_IMAGE_NAME)
  226. $(LINUX_INSTALL_DTB_TARGET)
  227. endef
  228. endif
  229. define LINUX_INSTALL_HOST_TOOLS
  230. # Installing dtc (device tree compiler) as host tool, if selected
  231. if grep -q "CONFIG_DTC=y" $(@D)/.config; then \
  232. $(INSTALL) -D -m 0755 $(@D)/scripts/dtc/dtc $(HOST_DIR)/usr/bin/dtc ; \
  233. fi
  234. endef
  235. define LINUX_INSTALL_IMAGES_CMDS
  236. cp $(LINUX_IMAGE_PATH) $(BINARIES_DIR)
  237. $(LINUX_INSTALL_DTB)
  238. endef
  239. define LINUX_INSTALL_TARGET_CMDS
  240. $(LINUX_INSTALL_KERNEL_IMAGE_TO_TARGET)
  241. # Install modules and remove symbolic links pointing to build
  242. # directories, not relevant on the target
  243. @if grep -q "CONFIG_MODULES=y" $(@D)/.config; then \
  244. $(TARGET_MAKE_ENV) $(MAKE1) $(LINUX_MAKE_FLAGS) -C $(@D) \
  245. DEPMOD="$(HOST_DIR)/usr/sbin/depmod" modules_install ; \
  246. rm -f $(TARGET_DIR)/lib/modules/$(LINUX_VERSION_PROBED)/build ; \
  247. rm -f $(TARGET_DIR)/lib/modules/$(LINUX_VERSION_PROBED)/source ; \
  248. fi
  249. $(LINUX_INSTALL_HOST_TOOLS)
  250. endef
  251. include linux/linux-ext-*.mk
  252. $(eval $(generic-package))
  253. ifeq ($(BR2_LINUX_KERNEL),y)
  254. linux-menuconfig linux-xconfig linux-gconfig linux-nconfig linux26-menuconfig linux26-xconfig linux26-gconfig linux26-nconfig: dirs linux-configure
  255. $(MAKE) $(LINUX_MAKE_FLAGS) -C $(LINUX_DIR) \
  256. $(subst linux-,,$(subst linux26-,,$@))
  257. rm -f $(LINUX_DIR)/.stamp_{built,target_installed,images_installed}
  258. linux-savedefconfig linux26-savedefconfig: dirs linux-configure
  259. $(MAKE) $(LINUX_MAKE_FLAGS) -C $(LINUX_DIR) \
  260. $(subst linux-,,$(subst linux26-,,$@))
  261. ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG),y)
  262. linux-update-config linux26-update-config: linux-configure $(LINUX_DIR)/.config
  263. cp -f $(LINUX_DIR)/.config $(BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE)
  264. linux-update-defconfig linux26-update-defconfig: linux-savedefconfig
  265. cp -f $(LINUX_DIR)/defconfig $(BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE)
  266. else
  267. linux-update-config linux26-update-config: ;
  268. linux-update-defconfig linux26-update-defconfig: ;
  269. endif
  270. endif
  271. # Support for rebuilding the kernel after the cpio archive has
  272. # been generated in $(BINARIES_DIR)/rootfs.cpio.
  273. $(LINUX_DIR)/.stamp_initramfs_rebuilt: $(LINUX_DIR)/.stamp_target_installed $(LINUX_DIR)/.stamp_images_installed $(BINARIES_DIR)/rootfs.cpio
  274. @$(call MESSAGE,"Rebuilding kernel with initramfs")
  275. # Build the kernel.
  276. $(TARGET_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(LINUX_IMAGE_NAME)
  277. $(LINUX_APPEND_DTB)
  278. # Copy the kernel image to its final destination
  279. cp $(LINUX_IMAGE_PATH) $(BINARIES_DIR)
  280. # If there is a .ub file copy it to the final destination
  281. test ! -f $(LINUX_IMAGE_PATH).ub || cp $(LINUX_IMAGE_PATH).ub $(BINARIES_DIR)
  282. $(Q)touch $@
  283. # The initramfs building code must make sure this target gets called
  284. # after it generated the initramfs list of files.
  285. linux-rebuild-with-initramfs linux26-rebuild-with-initramfs: $(LINUX_DIR)/.stamp_initramfs_rebuilt
  286. # Checks to give errors that the user can understand
  287. ifeq ($(filter source,$(MAKECMDGOALS)),)
  288. ifeq ($(BR2_LINUX_KERNEL_USE_DEFCONFIG),y)
  289. ifeq ($(call qstrip,$(BR2_LINUX_KERNEL_DEFCONFIG)),)
  290. $(error No kernel defconfig name specified, check your BR2_LINUX_KERNEL_DEFCONFIG setting)
  291. endif
  292. endif
  293. ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG),y)
  294. ifeq ($(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE)),)
  295. $(error No kernel configuration file specified, check your BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE setting)
  296. endif
  297. endif
  298. endif