1# 2# kbuild file for usr/ - including initramfs image 3# 4 5klibcdirs:; 6PHONY += klibcdirs 7 8 9# Generate builtin.o based on initramfs_data.o 10obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o 11 12# initramfs_data.o contains the initramfs_data.cpio.gz image. 13# The image is included using .incbin, a dependency which is not 14# tracked automatically. 15$(obj)/initramfs_data.o: $(obj)/initramfs_data.cpio.gz FORCE 16 17##### 18# Generate the initramfs cpio archive 19 20hostprogs-y := gen_init_cpio 21initramfs := $(CONFIG_SHELL) $(srctree)/scripts/gen_initramfs_list.sh 22ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \ 23 $(shell echo $(CONFIG_INITRAMFS_SOURCE)),-d) 24ramfs-args := \ 25 $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \ 26 $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID)) 27 28# .initramfs_data.cpio.gz.d is used to identify all files included 29# in initramfs and to detect if any files are added/removed. 30# Removed files are identified by directory timestamp being updated 31# The dependency list is generated by gen_initramfs.sh -l 32ifneq ($(wildcard $(obj)/.initramfs_data.cpio.gz.d),) 33 include $(obj)/.initramfs_data.cpio.gz.d 34endif 35 36quiet_cmd_initfs = GEN $@ 37 cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input) 38 39targets := initramfs_data.cpio.gz 40# do not try to update files included in initramfs 41$(deps_initramfs): ; 42 43$(deps_initramfs): klibcdirs 44# We rebuild initramfs_data.cpio.gz if: 45# 1) Any included file is newer then initramfs_data.cpio.gz 46# 2) There are changes in which files are included (added or deleted) 47# 3) If gen_init_cpio are newer than initramfs_data.cpio.gz 48# 4) arguments to gen_initramfs.sh changes 49$(obj)/initramfs_data.cpio.gz: $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs 50 $(Q)$(initramfs) -l $(ramfs-input) > $(obj)/.initramfs_data.cpio.gz.d 51 $(call if_changed,initfs) 52 53