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_$(CONFIG_INITRAMFS_COMPRESSION_LZMA) = .lzma 17 18# XZ 19suffix_$(CONFIG_INITRAMFS_COMPRESSION_XZ) = .xz 20 21# Lzo 22suffix_$(CONFIG_INITRAMFS_COMPRESSION_LZO) = .lzo 23 24AFLAGS_initramfs_data.o += -DINITRAMFS_IMAGE="usr/initramfs_data.cpio$(suffix_y)" 25 26# Generate builtin.o based on initramfs_data.o 27obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o 28 29# initramfs_data.o contains the compressed initramfs_data.cpio image. 30# The image is included using .incbin, a dependency which is not 31# tracked automatically. 32$(obj)/initramfs_data.o: $(obj)/initramfs_data.cpio$(suffix_y) FORCE 33 34##### 35# Generate the initramfs cpio archive 36 37hostprogs-y := gen_init_cpio 38initramfs := $(CONFIG_SHELL) $(srctree)/scripts/gen_initramfs_list.sh 39ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \ 40 $(shell echo $(CONFIG_INITRAMFS_SOURCE)),-d) 41ramfs-args := \ 42 $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \ 43 $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID)) 44 45# .initramfs_data.cpio.d is used to identify all files included 46# in initramfs and to detect if any files are added/removed. 47# Removed files are identified by directory timestamp being updated 48# The dependency list is generated by gen_initramfs.sh -l 49ifneq ($(wildcard $(obj)/.initramfs_data.cpio.d),) 50 include $(obj)/.initramfs_data.cpio.d 51endif 52 53quiet_cmd_initfs = GEN $@ 54 cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input) 55 56targets := initramfs_data.cpio.gz initramfs_data.cpio.bz2 initramfs_data.cpio.lzma initramfs_data.cpio.xz initramfs_data.cpio.lzo initramfs_data.cpio 57# do not try to update files included in initramfs 58$(deps_initramfs): ; 59 60$(deps_initramfs): klibcdirs 61# We rebuild initramfs_data.cpio if: 62# 1) Any included file is newer then initramfs_data.cpio 63# 2) There are changes in which files are included (added or deleted) 64# 3) If gen_init_cpio are newer than initramfs_data.cpio 65# 4) arguments to gen_initramfs.sh changes 66$(obj)/initramfs_data.cpio$(suffix_y): $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs 67 $(Q)$(initramfs) -l $(ramfs-input) > $(obj)/.initramfs_data.cpio.d 68 $(call if_changed,initfs) 69 70