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