2 # kbuild file for usr/ - including initramfs image
8 # Find out "preferred" ramdisk compressor. Order of preference is
9 # 1. bzip2 efficient, and likely to be present
10 # 2. gzip former default
17 # Lzma, but no gzip nor bzip2
18 suffix_
$(CONFIG_RD_LZMA
) = .lzma
21 suffix_
$(CONFIG_RD_GZIP
) = .gz
24 suffix_
$(CONFIG_RD_BZIP2
) = .bz2
27 # Generate builtin.o based on initramfs_data.o
28 obj-
$(CONFIG_BLK_DEV_INITRD
) := initramfs_data
$(suffix_y
).o
30 # initramfs_data.o contains the compressed initramfs_data.cpio image.
31 # The image is included using .incbin, a dependency which is not
32 # tracked automatically.
33 $(obj
)/initramfs_data
$(suffix_y
).o
: $(obj
)/initramfs_data.cpio
$(suffix_y
) FORCE
36 # Generate the initramfs cpio archive
38 hostprogs-y
:= gen_init_cpio
39 initramfs
:= $(CONFIG_SHELL
) $(srctree
)/scripts
/gen_initramfs_list.sh
40 ramfs-input
:= $(if
$(filter-out "",$(CONFIG_INITRAMFS_SOURCE
)), \
41 $(shell echo
$(CONFIG_INITRAMFS_SOURCE
)),-d
)
43 $(if
$(CONFIG_INITRAMFS_ROOT_UID
), -u
$(CONFIG_INITRAMFS_ROOT_UID
)) \
44 $(if
$(CONFIG_INITRAMFS_ROOT_GID
), -g
$(CONFIG_INITRAMFS_ROOT_GID
))
46 # .initramfs_data.cpio.d is used to identify all files included
47 # in initramfs and to detect if any files are added/removed.
48 # Removed files are identified by directory timestamp being updated
49 # The dependency list is generated by gen_initramfs.sh -l
50 ifneq ($(wildcard $(obj
)/.initramfs_data.cpio.d
),)
51 include $(obj
)/.initramfs_data.cpio.d
54 quiet_cmd_initfs
= GEN
$@
55 cmd_initfs
= $(initramfs
) -o
$@
$(ramfs-args
) $(ramfs-input
)
57 targets
:= initramfs_data.cpio.gz initramfs_data.cpio.bz2 initramfs_data.cpio.lzma initramfs_data.cpio
58 # do not try to update files included in initramfs
61 $(deps_initramfs
): klibcdirs
62 # We rebuild initramfs_data.cpio if:
63 # 1) Any included file is newer then initramfs_data.cpio
64 # 2) There are changes in which files are included (added or deleted)
65 # 3) If gen_init_cpio are newer than initramfs_data.cpio
66 # 4) arguments to gen_initramfs.sh changes
67 $(obj
)/initramfs_data.cpio
$(suffix_y
): $(obj
)/gen_init_cpio
$(deps_initramfs
) klibcdirs
68 $(Q
)$(initramfs
) -l
$(ramfs-input
) > $(obj
)/.initramfs_data.cpio.d
69 $(call if_changed
,initfs
)