2 # kbuild file for usr/ - including initramfs image
8 suffix_y = $(CONFIG_INITRAMFS_COMPRESSION)
9 AFLAGS_initramfs_data.o += -DINITRAMFS_IMAGE="usr/initramfs_data.cpio$(suffix_y)"
11 # Generate builtin.o based on initramfs_data.o
12 obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o
14 # initramfs_data.o contains the compressed initramfs_data.cpio image.
15 # The image is included using .incbin, a dependency which is not
16 # tracked automatically.
17 $(obj)/initramfs_data.o: $(obj)/initramfs_data.cpio$(suffix_y) FORCE
20 # Generate the initramfs cpio archive
22 hostprogs-y := gen_init_cpio
23 initramfs := $(CONFIG_SHELL) $(srctree)/scripts/gen_initramfs_list.sh
24 ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \
25 $(shell echo $(CONFIG_INITRAMFS_SOURCE)),-d)
27 $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \
28 $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID))
30 # .initramfs_data.cpio.d is used to identify all files included
31 # in initramfs and to detect if any files are added/removed.
32 # Removed files are identified by directory timestamp being updated
33 # The dependency list is generated by gen_initramfs.sh -l
34 ifneq ($(wildcard $(obj)/.initramfs_data.cpio.d),)
35 include $(obj)/.initramfs_data.cpio.d
38 quiet_cmd_initfs = GEN $@
39 cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input)
41 targets := initramfs_data.cpio.gz initramfs_data.cpio.bz2 \
42 initramfs_data.cpio.lzma initramfs_data.cpio.xz \
43 initramfs_data.cpio.lzo initramfs_data.cpio.lz4 \
45 # do not try to update files included in initramfs
48 $(deps_initramfs): klibcdirs
49 # We rebuild initramfs_data.cpio if:
50 # 1) Any included file is newer then initramfs_data.cpio
51 # 2) There are changes in which files are included (added or deleted)
52 # 3) If gen_init_cpio are newer than initramfs_data.cpio
53 # 4) arguments to gen_initramfs.sh changes
54 $(obj)/initramfs_data.cpio$(suffix_y): $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs
55 $(Q)$(initramfs) -l $(ramfs-input) > $(obj)/.initramfs_data.cpio.d
56 $(call if_changed,initfs)