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