blob: 382702ad663bea2fd72ba169556c147693a92b4a [file] [log] [blame]
Sam Ravnborgd39a2062006-04-11 13:24:32 +02001#
2# kbuild file for usr/ - including initramfs image
3#
Linus Torvalds1da177e2005-04-16 15:20:36 -07004
Sam Ravnborgd39a2062006-04-11 13:24:32 +02005klibcdirs:;
Sam Ravnborg48f1f052006-07-23 19:37:44 +02006PHONY += klibcdirs
7
Sam Ravnborgd39a2062006-04-11 13:24:32 +02008
9# Generate builtin.o based on initramfs_data.o
Linus Torvalds1da177e2005-04-16 15:20:36 -070010obj-y := initramfs_data.o
11
Linus Torvalds1da177e2005-04-16 15:20:36 -070012# 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
Sam Ravnborgd39a2062006-04-11 13:24:32 +020017#####
18# Generate the initramfs cpio archive
19
20hostprogs-y := gen_init_cpio
21initramfs := $(CONFIG_SHELL) $(srctree)/scripts/gen_initramfs_list.sh
22ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \
Thomas Choua26d79c2006-11-25 11:09:18 -080023 $(shell echo $(CONFIG_INITRAMFS_SOURCE)),-d)
Sam Ravnborgd39a2062006-04-11 13:24:32 +020024ramfs-args := \
25 $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \
Nickolayff541712006-06-09 21:24:14 +040026 $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID))
Sam Ravnborgd39a2062006-04-11 13:24:32 +020027
28# .initramfs_data.cpio.gz.d is used to identify all files included
29# in initramfs and to detect if any files are added/removed.
30# Removed files are identified by directory timestamp being updated
31# The dependency list is generated by gen_initramfs.sh -l
32ifneq ($(wildcard $(obj)/.initramfs_data.cpio.gz.d),)
33 include $(obj)/.initramfs_data.cpio.gz.d
Linus Torvalds1da177e2005-04-16 15:20:36 -070034endif
35
Sam Ravnborgd39a2062006-04-11 13:24:32 +020036quiet_cmd_initfs = GEN $@
37 cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input)
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
Sam Ravnborgd39a2062006-04-11 13:24:32 +020039targets := initramfs_data.cpio.gz
Sam Ravnborg58a2f7d2006-08-07 20:58:28 +020040# do not try to update files included in initramfs
41$(deps_initramfs): ;
42
Sam Ravnborgd39a2062006-04-11 13:24:32 +020043$(deps_initramfs): klibcdirs
44# We rebuild initramfs_data.cpio.gz if:
45# 1) Any included file is newer then initramfs_data.cpio.gz
46# 2) There are changes in which files are included (added or deleted)
47# 3) If gen_init_cpio are newer than initramfs_data.cpio.gz
48# 4) arguments to gen_initramfs.sh changes
49$(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)
Linus Torvalds1da177e2005-04-16 15:20:36 -070052