1# 2# kbuild file for usr/ - including initramfs image 3# 4 5klibcdirs:; 6PHONY += klibcdirs 7 8suffix_y = $(subst $\",,$(CONFIG_INITRAMFS_COMPRESSION)) 9datafile_y = initramfs_data.cpio$(suffix_y) 10AFLAGS_initramfs_data.o += -DINITRAMFS_IMAGE="usr/$(datafile_y)" 11 12 13# Generate builtin.o based on initramfs_data.o 14obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o 15 16# initramfs_data.o contains the compressed initramfs_data.cpio image. 17# The image is included using .incbin, a dependency which is not 18# tracked automatically. 19$(obj)/initramfs_data.o: $(obj)/$(datafile_y) FORCE 20 21##### 22# Generate the initramfs cpio archive 23 24hostprogs-y := gen_init_cpio 25initramfs := $(CONFIG_SHELL) $(srctree)/scripts/gen_initramfs_list.sh 26ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \ 27 $(shell echo $(CONFIG_INITRAMFS_SOURCE)),-d) 28ramfs-args := \ 29 $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \ 30 $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID)) 31 32# .initramfs_data.cpio.d is used to identify all files included 33# in initramfs and to detect if any files are added/removed. 34# Removed files are identified by directory timestamp being updated 35# The dependency list is generated by gen_initramfs.sh -l 36ifneq ($(wildcard $(obj)/.initramfs_data.cpio.d),) 37 include $(obj)/.initramfs_data.cpio.d 38endif 39 40quiet_cmd_initfs = GEN $@ 41 cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input) 42 43targets := $(datafile_y) 44 45# do not try to update files included in initramfs 46$(deps_initramfs): ; 47 48$(deps_initramfs): klibcdirs 49# We rebuild initramfs_data.cpio if: 50# 1) Any included file is newer then initramfs_data.cpio 51# 2) There are changes in which files are included (added or deleted) 52# 3) If gen_init_cpio are newer than initramfs_data.cpio 53# 4) arguments to gen_initramfs.sh changes 54$(obj)/$(datafile_y): $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs 55 $(Q)$(initramfs) -l $(ramfs-input) > $(obj)/.initramfs_data.cpio.d 56 $(call if_changed,initfs) 57