1 #
2 # kbuild file for usr/ - including initramfs image
3 #
4
5 klibcdirs:;
6 PHONY += klibcdirs
7
8
9 # Generate builtin.o based on initramfs_data.o
10 obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o
11
12 # initramfs_data.o contains the initramfs_data.cpio.gz image.
13 # The image is included using .incbin, a dependency which is not
14 # tracked automatically.
15 $(obj)/initramfs_data.o: $(obj)/initramfs_data.cpio.gz FORCE
16
17 #####
18 # Generate the initramfs cpio archive
19
20 hostprogs-y := gen_init_cpio
21 initramfs := $(CONFIG_SHELL) $(srctree)/scripts/gen_initramfs_list.sh
22 ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \
23 $(shell echo $(CONFIG_INITRAMFS_SOURCE)),-d)
24 ramfs-args := \
25 $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \
26 $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID))
27
28 # .initramfs_data.cpio.gz.d is used to identify all files included
29 # in initramfs and to detect if any files are added/removed.
30 # Removed files are identified by directory timestamp being updated
31 # The dependency list is generated by gen_initramfs.sh -l
32 ifneq ($(wildcard $(obj)/.initramfs_data.cpio.gz.d),)
33 include $(obj)/.initramfs_data.cpio.gz.d
34 endif
35
36 quiet_cmd_initfs = GEN $@
37 cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input)
38
39 targets := initramfs_data.cpio.gz
40 # do not try to update files included in initramfs
41 $(deps_initramfs): ;
42
43 $(deps_initramfs): klibcdirs
44 # We rebuild initramfs_data.cpio.gz if:
45 # 1) Any included file is newer then initramfs_data.cpio.gz
46 # 2) There are changes in which files are included (added or deleted)
47 # 3) If gen_init_cpio are newer than initramfs_data.cpio.gz
48 # 4) arguments to gen_initramfs.sh changes
49 $(obj)/initramfs_data.cpio.gz: $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs
50 $(Q)$(initramfs) -l $(ramfs-input) > $(obj)/.initramfs_data.cpio.gz.d
51 $(call if_changed,initfs)
52
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