2 # kbuild file for usr/ - including initramfs image
7 # Generate builtin.o based on initramfs_data.o
8 obj-y := initramfs_data.o
10 # initramfs_data.o contains the initramfs_data.cpio.gz image.
11 # The image is included using .incbin, a dependency which is not
12 # tracked automatically.
13 $(obj)/initramfs_data.o: $(obj)/initramfs_data.cpio.gz FORCE
16 # Generate the initramfs cpio archive
18 hostprogs-y := gen_init_cpio
19 initramfs := $(CONFIG_SHELL) $(srctree)/scripts/gen_initramfs_list.sh
20 ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \
21 $(CONFIG_INITRAMFS_SOURCE),-d)
23 $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \
24 $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID))
26 # .initramfs_data.cpio.gz.d is used to identify all files included
27 # in initramfs and to detect if any files are added/removed.
28 # Removed files are identified by directory timestamp being updated
29 # The dependency list is generated by gen_initramfs.sh -l
30 ifneq ($(wildcard $(obj)/.initramfs_data.cpio.gz.d),)
31 include $(obj)/.initramfs_data.cpio.gz.d
34 quiet_cmd_initfs = GEN $@
35 cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input)
37 targets := initramfs_data.cpio.gz
38 $(deps_initramfs): klibcdirs
39 # We rebuild initramfs_data.cpio.gz if:
40 # 1) Any included file is newer then initramfs_data.cpio.gz
41 # 2) There are changes in which files are included (added or deleted)
42 # 3) If gen_init_cpio are newer than initramfs_data.cpio.gz
43 # 4) arguments to gen_initramfs.sh changes
44 $(obj)/initramfs_data.cpio.gz: $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs
45 $(Q)$(initramfs) -l $(ramfs-input) > $(obj)/.initramfs_data.cpio.gz.d
46 $(call if_changed,initfs)