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