blob: 19d74e6f2685e11494d7dfdf66eb4c125d4d4c8d [file] [log] [blame]
Sam Ravnborgd39a206b2006-04-11 13:24:32 +02001#
2# kbuild file for usr/ - including initramfs image
3#
Linus Torvalds1da177e2005-04-16 15:20:36 -07004
Sam Ravnborgd39a206b2006-04-11 13:24:32 +02005klibcdirs:;
6
7# Generate builtin.o based on initramfs_data.o
Linus Torvalds1da177e2005-04-16 15:20:36 -07008obj-y := initramfs_data.o
9
Linus Torvalds1da177e2005-04-16 15:20:36 -070010# 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
14
Sam Ravnborgd39a206b2006-04-11 13:24:32 +020015#####
16# Generate the initramfs cpio archive
17
18hostprogs-y := gen_init_cpio
19initramfs := $(CONFIG_SHELL) $(srctree)/scripts/gen_initramfs_list.sh
20ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \
21 $(CONFIG_INITRAMFS_SOURCE),-d)
22ramfs-args := \
23 $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \
24 $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID)) \
25 $(ramfs-input)
26
27# .initramfs_data.cpio.gz.d is used to identify all files included
28# in initramfs and to detect if any files are added/removed.
29# Removed files are identified by directory timestamp being updated
30# The dependency list is generated by gen_initramfs.sh -l
31ifneq ($(wildcard $(obj)/.initramfs_data.cpio.gz.d),)
32 include $(obj)/.initramfs_data.cpio.gz.d
Linus Torvalds1da177e2005-04-16 15:20:36 -070033endif
34
Sam Ravnborgd39a206b2006-04-11 13:24:32 +020035quiet_cmd_initfs = GEN $@
36 cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input)
Linus Torvalds1da177e2005-04-16 15:20:36 -070037
Sam Ravnborgd39a206b2006-04-11 13:24:32 +020038targets := initramfs_data.cpio.gz
39$(deps_initramfs): klibcdirs
40# We rebuild initramfs_data.cpio.gz if:
41# 1) Any included file is newer then initramfs_data.cpio.gz
42# 2) There are changes in which files are included (added or deleted)
43# 3) If gen_init_cpio are newer than initramfs_data.cpio.gz
44# 4) arguments to gen_initramfs.sh changes
45$(obj)/initramfs_data.cpio.gz: $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs
46 $(Q)$(initramfs) -l $(ramfs-input) > $(obj)/.initramfs_data.cpio.gz.d
47 $(call if_changed,initfs)
Linus Torvalds1da177e2005-04-16 15:20:36 -070048