1 #
2 # kbuild file for usr/ - including initramfs image
3 #
4
5 klibcdirs:;
6 PHONY += klibcdirs
7
8
9 # Gzip, but no bzip2
10 suffix_$(CONFIG_INITRAMFS_COMPRESSION_GZIP) = .gz
11
12 # Bzip2
13 suffix_$(CONFIG_INITRAMFS_COMPRESSION_BZIP2) = .bz2
14
15 # Lzma
16 suffix_$(CONFIG_INITRAMFS_COMPRESSION_LZMA) = .lzma
17
18 # Generate builtin.o based on initramfs_data.o
19 obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data$(suffix_y).o
20
21 # initramfs_data.o contains the compressed initramfs_data.cpio image.
22 # The image is included using .incbin, a dependency which is not
23 # tracked automatically.
24 $(obj)/initramfs_data$(suffix_y).o: $(obj)/initramfs_data.cpio$(suffix_y) FORCE
25
26 #####
27 # Generate the initramfs cpio archive
28
29 hostprogs-y := gen_init_cpio
30 initramfs := $(CONFIG_SHELL) $(srctree)/scripts/gen_initramfs_list.sh
31 ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \
32 $(shell echo $(CONFIG_INITRAMFS_SOURCE)),-d)
33 ramfs-args := \
34 $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \
35 $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID))
36
37 # .initramfs_data.cpio.d is used to identify all files included
38 # in initramfs and to detect if any files are added/removed.
39 # Removed files are identified by directory timestamp being updated
40 # The dependency list is generated by gen_initramfs.sh -l
41 ifneq ($(wildcard $(obj)/.initramfs_data.cpio.d),)
42 include $(obj)/.initramfs_data.cpio.d
43 endif
44
45 quiet_cmd_initfs = GEN $@
46 cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input)
47
48 targets := initramfs_data.cpio.gz initramfs_data.cpio.bz2 initramfs_data.cpio.lzma initramfs_data.cpio
49 # do not try to update files included in initramfs
50 $(deps_initramfs): ;
51
52 $(deps_initramfs): klibcdirs
53 # We rebuild initramfs_data.cpio if:
54 # 1) Any included file is newer then initramfs_data.cpio
55 # 2) There are changes in which files are included (added or deleted)
56 # 3) If gen_init_cpio are newer than initramfs_data.cpio
57 # 4) arguments to gen_initramfs.sh changes
58 $(obj)/initramfs_data.cpio$(suffix_y): $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs
59 $(Q)$(initramfs) -l $(ramfs-input) > $(obj)/.initramfs_data.cpio.d
60 $(call if_changed,initfs)
61
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