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-rw-r--r--linux/linux.mk30
1 files changed, 30 insertions, 0 deletions
diff --git a/linux/linux.mk b/linux/linux.mk
index d1f1842f71..593a1b40a9 100644
--- a/linux/linux.mk
+++ b/linux/linux.mk
@@ -95,6 +95,19 @@ ifeq ($(BR2_INET_IPV6),y)
else
$(call KCONFIG_DISABLE_OPT,CONFIG_IPV6,$(@D)/.config)
endif
+ifeq ($(BR2_TARGET_ROOTFS_INITRAMFS),y)
+ # As the kernel gets compiled before root filesystems are
+ # built, we create a fake initramfs file list. It'll be
+ # replaced later by the real list, and the kernel will be
+ # rebuilt using the linux26-rebuild-with-initramfs target.
+ touch $(BINARIES_DIR)/rootfs.initramfs
+ $(call KCONFIG_ENABLE_OPT,CONFIG_BLK_DEV_INITRD,$(@D)/.config)
+ $(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_SOURCE,\"$(BINARIES_DIR)/rootfs.initramfs\",$(@D)/.config)
+ $(call KCONFIG_ENABLE_OPT,CONFIG_INITRAMFS_COMPRESSION_GZIP,$(@D)/.config)
+else
+ $(call KCONFIG_DISABLE_OPT,CONFIG_BLK_DEV_INITRD,$(@D)/.config)
+ $(call KCONFIG_SET_OPT,CONFIG_INITRAMFS_SOURCE,\"\",$(@D)/.config)
+endif
$(TARGET_MAKE_ENV) $(MAKE) $(LINUX26_MAKE_FLAGS) -C $(@D) oldconfig
$(Q)touch $@
@@ -127,6 +140,23 @@ linux26: host-module-init-tools $(LINUX26_DEPENDENCIES) $(LINUX26_DIR)/.stamp_in
linux26-menuconfig linux26-xconfig linux26-gconfig: $(LINUX26_DIR)/.stamp_configured
$(MAKE) $(LINUX26_MAKE_FLAGS) -C $(LINUX26_DIR) $(subst linux26-,,$@)
+# Support for rebuilding the kernel after the initramfs file list has
+# been generated in $(BINARIES_DIR)/rootfs.initramfs.
+$(LINUX26_DIR)/.stamp_initramfs_rebuilt: $(LINUX26_DIR)/.stamp_installed $(BINARIES_DIR)/rootfs.initramfs
+ @$(call MESSAGE,"Rebuilding kernel with initramfs")
+ # Remove the previously generated initramfs which was empty,
+ # to make sure the kernel will actually regenerate it.
+ $(RM) -f $(@D)/usr/initramfs_data.cpio.*
+ # Build the kernel.
+ $(TARGET_MAKE_ENV) $(MAKE) $(LINUX26_MAKE_FLAGS) -C $(@D) $(LINUX26_IMAGE_NAME)
+ # Copy the kernel image to its final destination
+ cp $(LINUX26_IMAGE_PATH) $(BINARIES_DIR)
+ $(Q)touch $@
+
+# The initramfs building code must make sure this target gets called
+# after it generated the initramfs list of files.
+linux26-rebuild-with-initramfs: $(LINUX26_DIR)/.stamp_initramfs_rebuilt
+
ifeq ($(BR2_LINUX_KERNEL),y)
TARGETS+=linux26
endif