1# 2# kbuild file for usr/ - including initramfs image 3# 4 5klibcdirs:; 6PHONY += klibcdirs 7 8 9# Gzip 10suffix_$(CONFIG_INITRAMFS_COMPRESSION_GZIP) = .gz 11 12# Bzip2 13suffix_$(CONFIG_INITRAMFS_COMPRESSION_BZIP2) = .bz2 14 15# Lzma 16suffix_$(CONFIG_INITRAMFS_COMPRESSION_LZMA) = .lzma 17 18# Generate builtin.o based on initramfs_data.o 19obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data$(suffix_y).o 20 21# initramfs_data.o contains the compressed initramfs_data.cpio image. 22# The image is included using .incbin, a dependency which is not 23# tracked automatically. 24$(obj)/initramfs_data$(suffix_y).o: $(obj)/initramfs_data.cpio$(suffix_y) FORCE 25 26##### 27# Generate the initramfs cpio archive 28 29hostprogs-y := gen_init_cpio 30initramfs := $(CONFIG_SHELL) $(srctree)/scripts/gen_initramfs_list.sh 31ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \ 32 $(shell echo $(CONFIG_INITRAMFS_SOURCE)),-d) 33ramfs-args := \ 34 $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \ 35 $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID)) 36 37# .initramfs_data.cpio.d is used to identify all files included 38# in initramfs and to detect if any files are added/removed. 39# Removed files are identified by directory timestamp being updated 40# The dependency list is generated by gen_initramfs.sh -l 41ifneq ($(wildcard $(obj)/.initramfs_data.cpio.d),) 42 include $(obj)/.initramfs_data.cpio.d 43endif 44 45quiet_cmd_initfs = GEN $@ 46 cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input) 47 48targets := initramfs_data.cpio.gz initramfs_data.cpio.bz2 initramfs_data.cpio.lzma initramfs_data.cpio 49# do not try to update files included in initramfs 50$(deps_initramfs): ; 51 52$(deps_initramfs): klibcdirs 53# We rebuild initramfs_data.cpio if: 54# 1) Any included file is newer then initramfs_data.cpio 55# 2) There are changes in which files are included (added or deleted) 56# 3) If gen_init_cpio are newer than initramfs_data.cpio 57# 4) arguments to gen_initramfs.sh changes 58$(obj)/initramfs_data.cpio$(suffix_y): $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs 59 $(Q)$(initramfs) -l $(ramfs-input) > $(obj)/.initramfs_data.cpio.d 60 $(call if_changed,initfs) 61 62