linux/linux.mk

   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
  10 # Compute LINUX_SOURCE and LINUX_SITE from the configuration
  11 ifeq ($(LINUX_VERSION),custom)
  12 LINUX_TARBALL = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_TARBALL_LOCATION))
  13 LINUX_SITE = $(dir $(LINUX_TARBALL))
  14 LINUX_SOURCE = $(notdir $(LINUX_TARBALL))
  15 else ifeq ($(BR2_LINUX_KERNEL_CUSTOM_GIT),y)
  16 LINUX_SITE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_GIT_REPO_URL))
  17 LINUX_SITE_METHOD = git
  18 else
  19 LINUX_SOURCE = linux-$(LINUX_VERSION).tar.bz2
  20 # In X.Y.Z, get X and Y. We replace dots and dashes by spaces in order
  21 # to use the $(word) function. We support versions such as 3.1,
  22 # 2.6.32, 2.6.32-rc1, 3.0-rc6, etc.
  23 ifeq ($(findstring x2.6.,x$(LINUX_VERSION)),x2.6.)
  24 LINUX_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v2.6/
  25 else
  26 LINUX_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v3.x/
  27 endif
  28 # release candidates are in testing/ subdir
  29 ifneq ($(findstring -rc,$(LINUX_VERSION)),)
  30 LINUX_SITE := $(LINUX_SITE)testing/
  31 endif # -rc
  32 endif
  33
  34 LINUX_PATCHES = $(call qstrip,$(BR2_LINUX_KERNEL_PATCH))
  35
  36 LINUX_INSTALL_IMAGES = YES
  37 LINUX_DEPENDENCIES  += host-module-init-tools
  38
  39 LINUX_MAKE_FLAGS = \
  40         HOSTCC="$(HOSTCC)" \
  41         HOSTCFLAGS="$(HOSTCFLAGS)" \
  42         ARCH=$(KERNEL_ARCH) \
  43         INSTALL_MOD_PATH=$(TARGET_DIR) \
  44         CROSS_COMPILE="$(CCACHE) $(TARGET_CROSS)" \
  45         DEPMOD=$(HOST_DIR)/usr/sbin/depmod
  46
  47 # Get the real Linux version, which tells us where kernel modules are
  48 # going to be installed in the target filesystem.
  49 LINUX_VERSION_PROBED = $(shell $(MAKE) $(LINUX_MAKE_FLAGS) -C $(LINUX_DIR) --no-print-directory -s kernelrelease)
  50
  51 ifeq ($(BR2_LINUX_KERNEL_IMAGE_TARGET_CUSTOM),y)
  52 LINUX_IMAGE_NAME=$(call qstrip,$(BR2_LINUX_KERNEL_IMAGE_TARGET_NAME))
  53 else
  54 ifeq ($(BR2_LINUX_KERNEL_UIMAGE),y)
  55 ifeq ($(KERNEL_ARCH),blackfin)
  56 # a uImage, but with a different file name
  57 LINUX_IMAGE_NAME=vmImage
  58 else
  59 LINUX_IMAGE_NAME=uImage
  60 endif
  61 LINUX_DEPENDENCIES+=host-uboot-tools
  62 else ifeq ($(BR2_LINUX_KERNEL_BZIMAGE),y)
  63 LINUX_IMAGE_NAME=bzImage
  64 else ifeq ($(BR2_LINUX_KERNEL_ZIMAGE),y)
  65 LINUX_IMAGE_NAME=zImage
  66 else ifeq ($(BR2_LINUX_KERNEL_VMLINUX_BIN),y)
  67 LINUX_IMAGE_NAME=vmlinux.bin
  68 else ifeq ($(BR2_LINUX_KERNEL_VMLINUX),y)
  69 LINUX_IMAGE_NAME=vmlinux
  70 else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ),y)
  71 LINUX_IMAGE_NAME=vmlinuz
  72 endif
  73 endif
  74
  75 # Compute the arch path, since i386 and x86_64 are in arch/x86 and not
  76 # in arch/$(KERNEL_ARCH). Even if the kernel creates symbolic links
  77 # for bzImage, arch/i386 and arch/x86_64 do not exist when copying the
  78 # defconfig file.
  79 ifeq ($(KERNEL_ARCH),i386)
  80 KERNEL_ARCH_PATH=$(LINUX_DIR)/arch/x86
  81 else ifeq ($(KERNEL_ARCH),x86_64)
  82 KERNEL_ARCH_PATH=$(LINUX_DIR)/arch/x86
  83 else
  84 KERNEL_ARCH_PATH=$(LINUX_DIR)/arch/$(KERNEL_ARCH)
  85 endif
  86
  87 ifeq ($(BR2_LINUX_KERNEL_VMLINUX),y)
  88 LINUX_IMAGE_PATH=$(LINUX_DIR)/$(LINUX_IMAGE_NAME)
  89 else ifeq ($(BR2_LINUX_KERNEL_VMLINUZ),y)
  90 LINUX_IMAGE_PATH=$(LINUX_DIR)/$(LINUX_IMAGE_NAME)
  91 else
  92 ifeq ($(KERNEL_ARCH),avr32)
  93 LINUX_IMAGE_PATH=$(KERNEL_ARCH_PATH)/boot/images/$(LINUX_IMAGE_NAME)
  94 else
  95 LINUX_IMAGE_PATH=$(KERNEL_ARCH_PATH)/boot/$(LINUX_IMAGE_NAME)
  96 endif
  97 endif # BR2_LINUX_KERNEL_VMLINUX
  98
  99 define LINUX_DOWNLOAD_PATCHES
 100         $(if $(LINUX_PATCHES),
 101                 @$(call MESSAGE,"Download additional patches"))
 102         $(foreach patch,$(filter ftp://% http://%,$(LINUX_PATCHES)),\
 103                 $(call DOWNLOAD,$(patch))$(sep))
 104 endef
 105
 106 LINUX_POST_DOWNLOAD_HOOKS += LINUX_DOWNLOAD_PATCHES
 107
 108 define LINUX_APPLY_PATCHES
 109         for p in $(LINUX_PATCHES) ; do \
 110                 if echo $$p | grep -q -E "^ftp://|^http://" ; then \
 111                         support/scripts/apply-patches.sh $(@D) $(DL_DIR) `basename $$p` ; \
 112                 elif test -d $$p ; then \
 113                         support/scripts/apply-patches.sh $(@D) $$p linux-\*.patch ; \
 114                 else \
 115                         support/scripts/apply-patches.sh $(@D) `dirname $$p` `basename $$p` ; \
 116                 fi \
 117         done
 118 endef
 119
 120 LINUX_POST_PATCH_HOOKS += LINUX_APPLY_PATCHES
 121
 122
 123 ifeq ($(BR2_LINUX_KERNEL_USE_DEFCONFIG),y)
 124 KERNEL_SOURCE_CONFIG = $(KERNEL_ARCH_PATH)/configs/$(call qstrip,$(BR2_LINUX_KERNEL_DEFCONFIG))_defconfig
 125 else ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG),y)
 126 KERNEL_SOURCE_CONFIG = $(BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE)
 127 endif
 128
 129 define LINUX_CONFIGURE_CMDS
 130         cp $(KERNEL_SOURCE_CONFIG) $(KERNEL_ARCH_PATH)/configs/buildroot_defconfig
 131         $(TARGET_MAKE_ENV) $(MAKE1) $(LINUX_MAKE_FLAGS) -C $(@D) buildroot_defconfig
 132         rm $(KERNEL_ARCH_PATH)/configs/buildroot_defconfig
 133         $(if $(BR2_ARM_EABI),
 134                 $(call KCONFIG_ENABLE_OPT,CONFIG_AEABI,$(@D)/.config),
 135                 $(call KCONFIG_DISABLE_OPT,CONFIG_AEABI,$(@D)/.config))
 136         # As the kernel gets compiled before root filesystems are
 137         # built, we create a fake cpio file. It'll be
 138         # replaced later by the real cpio archive, and the kernel will be
 139         # rebuilt using the linux26-rebuild-with-initramfs target.
 140         $(if $(BR2_TARGET_ROOTFS_INITRAMFS),
 141                 touch $(BINARIES_DIR)/rootfs.cpio
 142                 $(call KCONFIG_ENABLE_OPT,CONFIG_BLK_DEV_INITRD,$(@D)/.config)
 143                 $(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_SOURCE,\"$(BINARIES_DIR)/rootfs.cpio\",$(@D)/.config)
 144                 $(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_ROOT_UID,0,$(@D)/.config)
 145                 $(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_ROOT_GID,0,$(@D)/.config)
 146                 $(call KCONFIG_DISABLE_OPT,CONFIG_INITRAMFS_COMPRESSION_NONE,$(@D)/.config)
 147                 $(call KCONFIG_ENABLE_OPT,CONFIG_INITRAMFS_COMPRESSION_GZIP,$(@D)/.config))
 148         $(if $(BR2_ROOTFS_DEVICE_CREATION_STATIC),,
 149                 $(call KCONFIG_ENABLE_OPT,CONFIG_DEVTMPFS,$(@D)/.config)
 150                 $(call KCONFIG_ENABLE_OPT,CONFIG_DEVTMPFS_MOUNT,$(@D)/.config))
 151         $(if $(BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_MDEV),
 152                 $(call KCONFIG_SET_OPT,CONFIG_UEVENT_HELPER_PATH,\"/sbin/mdev\",$(@D)/.config))
 153         $(if $(BR2_PACKAGE_SYSTEMD),
 154                 $(call KCONFIG_ENABLE_OPT,CONFIG_CGROUPS,$(@D)/.config))
 155         yes '' | $(TARGET_MAKE_ENV) $(MAKE1) $(LINUX_MAKE_FLAGS) -C $(@D) oldconfig
 156 endef
 157
 158 # Compilation. We make sure the kernel gets rebuilt when the
 159 # configuration has changed.
 160 define LINUX_BUILD_CMDS
 161         $(TARGET_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(LINUX_IMAGE_NAME)
 162         @if grep -q "CONFIG_MODULES=y" $(@D)/.config; then      \
 163                 $(TARGET_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) modules ;       \
 164         fi
 165 endef
 166
 167
 168 ifeq ($(BR2_LINUX_KERNEL_INSTALL_TARGET),y)
 169 define LINUX_INSTALL_KERNEL_IMAGE_TO_TARGET
 170         install -m 0644 -D $(LINUX_IMAGE_PATH) $(TARGET_DIR)/boot/$(LINUX_IMAGE_NAME)
 171 endef
 172 endif
 173
 174
 175 define LINUX_INSTALL_HOST_TOOLS
 176         # Installing dtc (device tree compiler) as host tool, if selected
 177         if grep -q "CONFIG_DTC=y" $(@D)/.config; then   \
 178                 $(INSTALL) -D -m 0755 $(@D)/scripts/dtc/dtc $(HOST_DIR)/usr/bin/dtc ;   \
 179         fi
 180 endef
 181
 182
 183 define LINUX_INSTALL_IMAGES_CMDS
 184         cp $(LINUX_IMAGE_PATH) $(BINARIES_DIR)
 185 endef
 186
 187 define LINUX_INSTALL_TARGET_CMDS
 188         $(LINUX_INSTALL_KERNEL_IMAGE_TO_TARGET)
 189         # Install modules and remove symbolic links pointing to build
 190         # directories, not relevant on the target
 191         @if grep -q "CONFIG_MODULES=y" $(@D)/.config; then      \
 192                 $(TARGET_MAKE_ENV) $(MAKE1) $(LINUX_MAKE_FLAGS) -C $(@D)                \
 193                         DEPMOD="$(HOST_DIR)/usr/sbin/depmod" modules_install ;          \
 194                 rm -f $(TARGET_DIR)/lib/modules/$(LINUX_VERSION_PROBED)/build ;         \
 195                 rm -f $(TARGET_DIR)/lib/modules/$(LINUX_VERSION_PROBED)/source ;        \
 196         fi
 197         $(LINUX_INSTALL_HOST_TOOLS)
 198 endef
 199
 200 include linux/linux-ext-*.mk
 201
 202 $(eval $(generic-package))
 203
 204 ifeq ($(BR2_LINUX_KERNEL),y)
 205 linux-menuconfig linux-xconfig linux-gconfig linux-nconfig linux26-menuconfig linux26-xconfig linux26-gconfig linux26-nconfig: dirs linux-configure
 206         $(MAKE) $(LINUX_MAKE_FLAGS) -C $(LINUX_DIR) \
 207                 $(subst linux-,,$(subst linux26-,,$@))
 208         rm -f $(LINUX_DIR)/.stamp_{built,target_installed,images_installed}
 209
 210 linux-savedefconfig linux26-savedefconfig: dirs linux-configure
 211         $(MAKE) $(LINUX_MAKE_FLAGS) -C $(LINUX_DIR) \
 212                 $(subst linux-,,$(subst linux26-,,$@))
 213
 214 ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG),y)
 215 linux-update-config linux26-update-config: linux-configure $(LINUX_DIR)/.config
 216         cp -f $(LINUX_DIR)/.config $(BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE)
 217
 218 linux-update-defconfig linux26-update-defconfig: linux-savedefconfig
 219         cp -f $(LINUX_DIR)/defconfig $(BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE)
 220 else
 221 linux-update-config linux26-update-config: ;
 222 linux-update-defconfig linux26-update-defconfig: ;
 223 endif
 224 endif
 225
 226 # Support for rebuilding the kernel after the cpio archive has
 227 # been generated in $(BINARIES_DIR)/rootfs.cpio.
 228 $(LINUX_DIR)/.stamp_initramfs_rebuilt: $(LINUX_DIR)/.stamp_target_installed $(LINUX_DIR)/.stamp_images_installed $(BINARIES_DIR)/rootfs.cpio
 229         @$(call MESSAGE,"Rebuilding kernel with initramfs")
 230         # Build the kernel.
 231         $(TARGET_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(LINUX_IMAGE_NAME)
 232         # Copy the kernel image to its final destination
 233         cp $(LINUX_IMAGE_PATH) $(BINARIES_DIR)
 234         # If there is a .ub file copy it to the final destination
 235         test ! -f $(LINUX_IMAGE_PATH).ub || cp $(LINUX_IMAGE_PATH).ub $(BINARIES_DIR)
 236         $(Q)touch $@
 237
 238 # The initramfs building code must make sure this target gets called
 239 # after it generated the initramfs list of files.
 240 linux-rebuild-with-initramfs linux26-rebuild-with-initramfs: $(LINUX_DIR)/.stamp_initramfs_rebuilt
 241
 242 # Checks to give errors that the user can understand
 243 ifeq ($(filter source,$(MAKECMDGOALS)),)
 244 ifeq ($(BR2_LINUX_KERNEL_USE_DEFCONFIG),y)
 245 ifeq ($(call qstrip,$(BR2_LINUX_KERNEL_DEFCONFIG)),)
 246 $(error No kernel defconfig name specified, check your BR2_LINUX_KERNEL_DEFCONFIG setting)
 247 endif
 248 endif
 249
 250 ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG),y)
 251 ifeq ($(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE)),)
 252 $(error No kernel configuration file specified, check your BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE setting)
 253 endif
 254 endif
 255
 256 endif