1 # SPDX-License-Identifier: GPL-2.0
3 # kbuild file for usr/ - including initramfs image
9 suffix_y
= $(subst $\",,$(CONFIG_INITRAMFS_COMPRESSION
))
10 datafile_y
= initramfs_data.cpio
$(suffix_y
)
11 AFLAGS_initramfs_data.o
+= -DINITRAMFS_IMAGE
="usr/$(datafile_y)"
14 # Generate builtin.o based on initramfs_data.o
15 obj-
$(CONFIG_BLK_DEV_INITRD
) := initramfs_data.o
17 # initramfs_data.o contains the compressed initramfs_data.cpio image.
18 # The image is included using .incbin, a dependency which is not
19 # tracked automatically.
20 $(obj
)/initramfs_data.o
: $(obj
)/$(datafile_y
) FORCE
23 # Generate the initramfs cpio archive
25 hostprogs-y
:= gen_init_cpio
26 initramfs
:= $(CONFIG_SHELL
) $(srctree
)/scripts
/gen_initramfs_list.sh
27 ramfs-input
:= $(if
$(filter-out "",$(CONFIG_INITRAMFS_SOURCE
)), \
28 $(shell echo
$(CONFIG_INITRAMFS_SOURCE
)),-d
)
30 $(if
$(CONFIG_INITRAMFS_ROOT_UID
), -u
$(CONFIG_INITRAMFS_ROOT_UID
)) \
31 $(if
$(CONFIG_INITRAMFS_ROOT_GID
), -g
$(CONFIG_INITRAMFS_ROOT_GID
))
33 # .initramfs_data.cpio.d is used to identify all files included
34 # in initramfs and to detect if any files are added/removed.
35 # Removed files are identified by directory timestamp being updated
36 # The dependency list is generated by gen_initramfs.sh -l
37 ifneq ($(wildcard $(obj
)/.initramfs_data.cpio.d
),)
38 include $(obj
)/.initramfs_data.cpio.d
41 quiet_cmd_initfs
= GEN
$@
42 cmd_initfs
= $(initramfs
) -o
$@
$(ramfs-args
) $(ramfs-input
)
44 targets
:= $(datafile_y
)
46 # do not try to update files included in initramfs
49 $(deps_initramfs
): klibcdirs
50 # We rebuild initramfs_data.cpio if:
51 # 1) Any included file is newer then initramfs_data.cpio
52 # 2) There are changes in which files are included (added or deleted)
53 # 3) If gen_init_cpio are newer than initramfs_data.cpio
54 # 4) arguments to gen_initramfs.sh changes
55 $(obj
)/$(datafile_y
): $(obj
)/gen_init_cpio
$(deps_initramfs
) klibcdirs
56 $(Q
)$(initramfs
) -l
$(ramfs-input
) > $(obj
)/.initramfs_data.cpio.d
57 $(call if_changed
,initfs
)