2 # kbuild file for usr/ - including initramfs image
10 suffix_$(CONFIG_INITRAMFS_COMPRESSION_GZIP) = .gz
13 suffix_$(CONFIG_INITRAMFS_COMPRESSION_BZIP2) = .bz2
16 suffix_$(CONFIG_INITRAMFS_COMPRESSION_LZMA) = .lzma
19 suffix_$(CONFIG_INITRAMFS_COMPRESSION_LZO) = .lzo
21 AFLAGS_initramfs_data.o += -DINITRAMFS_IMAGE="usr/initramfs_data.cpio$(suffix_y)"
23 # Generate builtin.o based on initramfs_data.o
24 obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o
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
32 # Generate the initramfs cpio archive
34 hostprogs-y := gen_init_cpio
35 initramfs := $(CONFIG_SHELL) $(srctree)/scripts/gen_initramfs_list.sh
36 ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \
37 $(shell echo $(CONFIG_INITRAMFS_SOURCE)),-d)
39 $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \
40 $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID))
42 # .initramfs_data.cpio.d is used to identify all files included
43 # in initramfs and to detect if any files are added/removed.
44 # Removed files are identified by directory timestamp being updated
45 # The dependency list is generated by gen_initramfs.sh -l
46 ifneq ($(wildcard $(obj)/.initramfs_data.cpio.d),)
47 include $(obj)/.initramfs_data.cpio.d
50 quiet_cmd_initfs = GEN $@
51 cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input)
53 targets := 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
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)