linux/linux.mk

   1 ###############################################################################
   2 #
   3 # Linux kernel target
   4 #
   5 ###############################################################################
   6 LINUX_VERSION=$(call qstrip,$(BR2_LINUX_KERNEL_VERSION))
   7
   8 # Compute LINUX_SOURCE and LINUX_SITE from the configuration
   9 ifeq ($(LINUX_VERSION),custom)
  10 LINUX_TARBALL = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_TARBALL_LOCATION))
  11 LINUX_SITE = $(dir $(LINUX_TARBALL))
  12 LINUX_SOURCE = $(notdir $(LINUX_TARBALL))
  13 else
  14 LINUX_SOURCE = linux-$(LINUX_VERSION).tar.bz2
  15 LINUX_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/v2.6/
  16 endif
  17
  18 LINUX_PATCHES = $(call qstrip,$(BR2_LINUX_KERNEL_PATCH))
  19
  20 LINUX_INSTALL_IMAGES = YES
  21 LINUX_DEPENDENCIES  += host-module-init-tools
  22
  23 LINUX_MAKE_FLAGS = \
  24         HOSTCC="$(HOSTCC)" \
  25         HOSTCFLAGS="$(HOSTCFLAGS)" \
  26         ARCH=$(KERNEL_ARCH) \
  27         INSTALL_MOD_PATH=$(TARGET_DIR) \
  28         CROSS_COMPILE="$(CCACHE) $(TARGET_CROSS)" \
  29         LZMA="$(LZMA)"
  30
  31 # Get the real Linux version, which tells us where kernel modules are
  32 # going to be installed in the target filesystem.
  33 LINUX_VERSION_PROBED = $(shell $(MAKE) $(LINUX_MAKE_FLAGS) -C $(LINUX_DIR) --no-print-directory -s kernelrelease)
  34
  35 ifeq ($(BR2_LINUX_KERNEL_IMAGE_TARGET_CUSTOM),y)
  36 LINUX_IMAGE_NAME=$(call qstrip,$(BR2_LINUX_KERNEL_IMAGE_TARGET_NAME))
  37 else
  38 ifeq ($(BR2_LINUX_KERNEL_UIMAGE),y)
  39 ifeq ($(KERNEL_ARCH),blackfin)
  40 # a uImage, but with a different file name
  41 LINUX_IMAGE_NAME=vmImage
  42 else
  43 LINUX_IMAGE_NAME=uImage
  44 endif
  45 LINUX_DEPENDENCIES+=host-uboot-mkimage
  46 else ifeq ($(BR2_LINUX_KERNEL_BZIMAGE),y)
  47 LINUX_IMAGE_NAME=bzImage
  48 else ifeq ($(BR2_LINUX_KERNEL_ZIMAGE),y)
  49 LINUX_IMAGE_NAME=zImage
  50 else ifeq ($(BR2_LINUX_KERNEL_VMLINUX_BIN),y)
  51 LINUX_IMAGE_NAME=vmlinux.bin
  52 else ifeq ($(BR2_LINUX_KERNEL_VMLINUX),y)
  53 LINUX_IMAGE_NAME=vmlinux
  54 endif
  55 endif
  56
  57 # Compute the arch path, since i386 and x86_64 are in arch/x86 and not
  58 # in arch/$(KERNEL_ARCH). Even if the kernel creates symbolic links
  59 # for bzImage, arch/i386 and arch/x86_64 do not exist when copying the
  60 # defconfig file.
  61 ifeq ($(KERNEL_ARCH),i386)
  62 KERNEL_ARCH_PATH=$(LINUX_DIR)/arch/x86
  63 else ifeq ($(KERNEL_ARCH),x86_64)
  64 KERNEL_ARCH_PATH=$(LINUX_DIR)/arch/x86
  65 else
  66 KERNEL_ARCH_PATH=$(LINUX_DIR)/arch/$(KERNEL_ARCH)
  67 endif
  68
  69 ifeq ($(BR2_LINUX_KERNEL_VMLINUX),y)
  70 LINUX_IMAGE_PATH=$(LINUX_DIR)/$(LINUX_IMAGE_NAME)
  71 else
  72 ifeq ($(KERNEL_ARCH),avr32)
  73 LINUX_IMAGE_PATH=$(KERNEL_ARCH_PATH)/boot/images/$(LINUX_IMAGE_NAME)
  74 else
  75 LINUX_IMAGE_PATH=$(KERNEL_ARCH_PATH)/boot/$(LINUX_IMAGE_NAME)
  76 endif
  77 endif # BR2_LINUX_KERNEL_VMLINUX
  78
  79 define LINUX_DOWNLOAD_PATCHES
  80         $(if $(LINUX_PATCHES),
  81                 @$(call MESSAGE,"Download additional patches"))
  82         $(foreach patch,$(filter ftp://% http://%,$(LINUX_PATCHES)),\
  83                 $(call DOWNLOAD,$(dir $(patch)),$(notdir $(patch)))$(sep))
  84 endef
  85
  86 LINUX_POST_DOWNLOAD_HOOKS += LINUX_DOWNLOAD_PATCHES
  87
  88 define LINUX_APPLY_PATCHES
  89         for p in $(LINUX_PATCHES) ; do \
  90                 if echo $$p | grep -q -E "^ftp://|^http://" ; then \
  91                         toolchain/patch-kernel.sh $(@D) $(DL_DIR) `basename $$p` ; \
  92                 elif test -d $$p ; then \
  93                         toolchain/patch-kernel.sh $(@D) $$p linux-\*.patch ; \
  94                 else \
  95                         toolchain/patch-kernel.sh $(@D) `dirname $$p` `basename $$p` ; \
  96                 fi \
  97         done
  98 endef
  99
 100 LINUX_POST_PATCH_HOOKS += LINUX_APPLY_PATCHES
 101
 102
 103 ifeq ($(BR2_LINUX_KERNEL_USE_DEFCONFIG),y)
 104 KERNEL_SOURCE_CONFIG = $(KERNEL_ARCH_PATH)/configs/$(call qstrip,$(BR2_LINUX_KERNEL_DEFCONFIG))_defconfig
 105 else ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG),y)
 106 KERNEL_SOURCE_CONFIG = $(BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE)
 107 endif
 108
 109 define LINUX_CONFIGURE_CMDS
 110         cp $(KERNEL_SOURCE_CONFIG) $(KERNEL_ARCH_PATH)/configs/buildroot_defconfig
 111         $(TARGET_MAKE_ENV) $(MAKE1) $(LINUX_MAKE_FLAGS) -C $(@D) buildroot_defconfig
 112         rm $(KERNEL_ARCH_PATH)/configs/buildroot_defconfig
 113         $(if $(BR2_ARM_EABI),
 114                 $(call KCONFIG_ENABLE_OPT,CONFIG_AEABI,$(@D)/.config),
 115                 $(call KCONFIG_DISABLE_OPT,CONFIG_AEABI,$(@D)/.config))
 116         # As the kernel gets compiled before root filesystems are
 117         # built, we create a fake initramfs file list. It'll be
 118         # replaced later by the real list, and the kernel will be
 119         # rebuilt using the linux26-rebuild-with-initramfs target.
 120         $(if $(BR2_TARGET_ROOTFS_INITRAMFS),
 121                 touch $(BINARIES_DIR)/rootfs.initramfs
 122                 $(call KCONFIG_ENABLE_OPT,CONFIG_BLK_DEV_INITRD,$(@D)/.config)
 123                 $(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_SOURCE,\"$(BINARIES_DIR)/rootfs.initramfs\",$(@D)/.config)
 124                 $(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_ROOT_UID,0,$(@D)/.config)
 125                 $(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_ROOT_GID,0,$(@D)/.config)
 126                 $(call KCONFIG_DISABLE_OPT,CONFIG_INITRAMFS_COMPRESSION_NONE,$(@D)/.config)
 127                 $(call KCONFIG_ENABLE_OPT,CONFIG_INITRAMFS_COMPRESSION_GZIP,$(@D)/.config))
 128         $(if $(BR2_ROOTFS_DEVICE_CREATION_STATIC),,
 129                 $(call KCONFIG_ENABLE_OPT,CONFIG_DEVTMPFS,$(@D)/.config)
 130                 $(call KCONFIG_ENABLE_OPT,CONFIG_DEVTMPFS_MOUNT,$(@D)/.config))
 131         $(if $(BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_MDEV),
 132                 $(call KCONFIG_SET_OPT,CONFIG_UEVENT_HELPER_PATH,\"/sbin/mdev\",$(@D)/.config))
 133         yes '' | $(TARGET_MAKE_ENV) $(MAKE1) $(LINUX_MAKE_FLAGS) -C $(@D) oldconfig
 134 endef
 135
 136 # Compilation. We make sure the kernel gets rebuilt when the
 137 # configuration has changed.
 138 define LINUX_BUILD_CMDS
 139         $(TARGET_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(LINUX_IMAGE_NAME)
 140         @if grep -q "CONFIG_MODULES=y" $(@D)/.config; then      \
 141                 $(TARGET_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) modules ;       \
 142         fi
 143 endef
 144
 145
 146 ifeq ($(BR2_LINUX_KERNEL_INSTALL_TARGET),y)
 147 define LINUX_INSTALL_KERNEL_IMAGE_TO_TARGET
 148         install -m 0644 -D $(LINUX_IMAGE_PATH) $(TARGET_DIR)/boot/$(LINUX_IMAGE_NAME)
 149 endef
 150 endif
 151
 152 define LINUX_INSTALL_IMAGES_CMDS
 153         cp $(LINUX_IMAGE_PATH) $(BINARIES_DIR)
 154 endef
 155
 156 define LINUX_INSTALL_TARGET_CMDS
 157         $(LINUX_INSTALL_KERNEL_IMAGE_TO_TARGET)
 158         # Install modules and remove symbolic links pointing to build
 159         # directories, not relevant on the target
 160         @if grep -q "CONFIG_MODULES=y" $(@D)/.config; then      \
 161                 $(TARGET_MAKE_ENV) $(MAKE1) $(LINUX_MAKE_FLAGS) -C $(@D)                \
 162                         DEPMOD="$(HOST_DIR)/usr/sbin/depmod" modules_install ;          \
 163                 rm -f $(TARGET_DIR)/lib/modules/$(LINUX_VERSION_PROBED)/build ;         \
 164                 rm -f $(TARGET_DIR)/lib/modules/$(LINUX_VERSION_PROBED)/source ;        \
 165         fi
 166 endef
 167
 168 $(eval $(call GENTARGETS,,linux))
 169
 170 linux-menuconfig linux-xconfig linux-gconfig linux-nconfig linux26-menuconfig linux26-xconfig linux26-gconfig linux26-nconfig: dirs $(LINUX_DIR)/.stamp_configured
 171         $(MAKE) $(LINUX_MAKE_FLAGS) -C $(LINUX_DIR) \
 172                 $(subst linux-,,$(subst linux26-,,$@))
 173         rm -f $(LINUX_DIR)/.stamp_{built,target_installed,images_installed}
 174
 175 # Support for rebuilding the kernel after the initramfs file list has
 176 # been generated in $(BINARIES_DIR)/rootfs.initramfs.
 177 $(LINUX_DIR)/.stamp_initramfs_rebuilt: $(LINUX_DIR)/.stamp_target_installed $(LINUX_DIR)/.stamp_images_installed $(BINARIES_DIR)/rootfs.initramfs
 178         @$(call MESSAGE,"Rebuilding kernel with initramfs")
 179         # Remove the previously generated initramfs which was empty,
 180         # to make sure the kernel will actually regenerate it.
 181         $(RM) -f $(@D)/usr/initramfs_data.cpio*
 182         # Build the kernel.
 183         $(TARGET_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(LINUX_IMAGE_NAME)
 184         # Copy the kernel image to its final destination
 185         cp $(LINUX_IMAGE_PATH) $(BINARIES_DIR)
 186         $(Q)touch $@
 187
 188 # The initramfs building code must make sure this target gets called
 189 # after it generated the initramfs list of files.
 190 linux-rebuild-with-initramfs linux26-rebuild-with-initramfs: $(LINUX_DIR)/.stamp_initramfs_rebuilt
 191
 192 # Checks to give errors that the user can understand
 193 ifeq ($(filter source,$(MAKECMDGOALS)),)
 194 ifeq ($(BR2_LINUX_KERNEL_USE_DEFCONFIG),y)
 195 ifeq ($(call qstrip,$(BR2_LINUX_KERNEL_DEFCONFIG)),)
 196 $(error No kernel defconfig name specified, check your BR2_LINUX_KERNEL_DEFCONFIG setting)
 197 endif
 198 endif
 199
 200 ifeq ($(BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG),y)
 201 ifeq ($(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE)),)
 202 $(error No kernel configuration file specified, check your BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE setting)
 203 endif
 204 endif
 205
 206 endif