blob: 451cdff7dff9833a6e27c3993023ed1a11f3c556 [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:;
Sam Ravnborg48f1f052006-07-23 19:37:44 +02006PHONY += klibcdirs
7
Alain Knaffa26ee602009-01-07 00:10:27 -08008# Find out "preferred" ramdisk compressor. Order of preference is
9# 1. bzip2 efficient, and likely to be present
10# 2. gzip former default
11# 3. lzma
12# 4. none
13
14# None of the above
15suffix_y =
16
17# Lzma, but no gzip nor bzip2
18suffix_$(CONFIG_RD_LZMA) = .lzma
19
20# Gzip, but no bzip2
21suffix_$(CONFIG_RD_GZIP) = .gz
22
23# Bzip2
24suffix_$(CONFIG_RD_BZIP2) = .bz2
25
Sam Ravnborgd39a206b2006-04-11 13:24:32 +020026
27# Generate builtin.o based on initramfs_data.o
Alain Knaffa26ee602009-01-07 00:10:27 -080028obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data$(suffix_y).o
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
Alain Knaffa26ee602009-01-07 00:10:27 -080030# initramfs_data.o contains the compressed initramfs_data.cpio image.
Linus Torvalds1da177e2005-04-16 15:20:36 -070031# The image is included using .incbin, a dependency which is not
32# tracked automatically.
Alain Knaffa26ee602009-01-07 00:10:27 -080033$(obj)/initramfs_data$(suffix_y).o: $(obj)/initramfs_data.cpio$(suffix_y) FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -070034
Sam Ravnborgd39a206b2006-04-11 13:24:32 +020035#####
36# Generate the initramfs cpio archive
37
38hostprogs-y := gen_init_cpio
39initramfs := $(CONFIG_SHELL) $(srctree)/scripts/gen_initramfs_list.sh
40ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \
Thomas Choua26d79c2006-11-25 11:09:18 -080041 $(shell echo $(CONFIG_INITRAMFS_SOURCE)),-d)
Sam Ravnborgd39a206b2006-04-11 13:24:32 +020042ramfs-args := \
43 $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \
Nickolayff541712006-06-09 21:24:14 +040044 $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID))
Sam Ravnborgd39a206b2006-04-11 13:24:32 +020045
Alain Knaffa26ee602009-01-07 00:10:27 -080046# .initramfs_data.cpio.d is used to identify all files included
Sam Ravnborgd39a206b2006-04-11 13:24:32 +020047# in initramfs and to detect if any files are added/removed.
48# Removed files are identified by directory timestamp being updated
49# The dependency list is generated by gen_initramfs.sh -l
Alain Knaffa26ee602009-01-07 00:10:27 -080050ifneq ($(wildcard $(obj)/.initramfs_data.cpio.d),)
51 include $(obj)/.initramfs_data.cpio.d
Linus Torvalds1da177e2005-04-16 15:20:36 -070052endif
53
Sam Ravnborgd39a206b2006-04-11 13:24:32 +020054quiet_cmd_initfs = GEN $@
55 cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input)
Linus Torvalds1da177e2005-04-16 15:20:36 -070056
Alain Knaffa26ee602009-01-07 00:10:27 -080057targets := initramfs_data.cpio.gz initramfs_data.cpio.bz2 initramfs_data.cpio.lzma initramfs_data.cpio
Sam Ravnborg58a2f7d2006-08-07 20:58:28 +020058# do not try to update files included in initramfs
59$(deps_initramfs): ;
60
Sam Ravnborgd39a206b2006-04-11 13:24:32 +020061$(deps_initramfs): klibcdirs
Alain Knaffa26ee602009-01-07 00:10:27 -080062# We rebuild initramfs_data.cpio if:
63# 1) Any included file is newer then initramfs_data.cpio
Sam Ravnborgd39a206b2006-04-11 13:24:32 +020064# 2) There are changes in which files are included (added or deleted)
Alain Knaffa26ee602009-01-07 00:10:27 -080065# 3) If gen_init_cpio are newer than initramfs_data.cpio
Sam Ravnborgd39a206b2006-04-11 13:24:32 +020066# 4) arguments to gen_initramfs.sh changes
Alain Knaffa26ee602009-01-07 00:10:27 -080067$(obj)/initramfs_data.cpio$(suffix_y): $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs
68 $(Q)$(initramfs) -l $(ramfs-input) > $(obj)/.initramfs_data.cpio.d
Sam Ravnborgd39a206b2006-04-11 13:24:32 +020069 $(call if_changed,initfs)
Linus Torvalds1da177e2005-04-16 15:20:36 -070070