Root/usr/Makefile

1#
2# kbuild file for usr/ - including initramfs image
3#
4
5klibcdirs:;
6PHONY += klibcdirs
7
8
9# Gzip
10suffix_$(CONFIG_INITRAMFS_COMPRESSION_GZIP) = .gz
11
12# Bzip2
13suffix_$(CONFIG_INITRAMFS_COMPRESSION_BZIP2) = .bz2
14
15# Lzma
16suffix_$(CONFIG_INITRAMFS_COMPRESSION_LZMA) = .lzma
17
18# Lzo
19suffix_$(CONFIG_INITRAMFS_COMPRESSION_LZO) = .lzo
20
21# Generate builtin.o based on initramfs_data.o
22obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data$(suffix_y).o
23
24# initramfs_data.o contains the compressed initramfs_data.cpio image.
25# The image is included using .incbin, a dependency which is not
26# tracked automatically.
27$(obj)/initramfs_data$(suffix_y).o: $(obj)/initramfs_data.cpio$(suffix_y) FORCE
28
29#####
30# Generate the initramfs cpio archive
31
32hostprogs-y := gen_init_cpio
33initramfs := $(CONFIG_SHELL) $(srctree)/scripts/gen_initramfs_list.sh
34ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \
35            $(shell echo $(CONFIG_INITRAMFS_SOURCE)),-d)
36ramfs-args := \
37        $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \
38        $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID))
39
40# .initramfs_data.cpio.d is used to identify all files included
41# in initramfs and to detect if any files are added/removed.
42# Removed files are identified by directory timestamp being updated
43# The dependency list is generated by gen_initramfs.sh -l
44ifneq ($(wildcard $(obj)/.initramfs_data.cpio.d),)
45    include $(obj)/.initramfs_data.cpio.d
46endif
47
48quiet_cmd_initfs = GEN $@
49      cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input)
50
51targets := initramfs_data.cpio.gz initramfs_data.cpio.bz2 initramfs_data.cpio.lzma initramfs_data.cpio.lzo initramfs_data.cpio
52# do not try to update files included in initramfs
53$(deps_initramfs): ;
54
55$(deps_initramfs): klibcdirs
56# We rebuild initramfs_data.cpio if:
57# 1) Any included file is newer then initramfs_data.cpio
58# 2) There are changes in which files are included (added or deleted)
59# 3) If gen_init_cpio are newer than initramfs_data.cpio
60# 4) arguments to gen_initramfs.sh changes
61$(obj)/initramfs_data.cpio$(suffix_y): $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs
62    $(Q)$(initramfs) -l $(ramfs-input) > $(obj)/.initramfs_data.cpio.d
63    $(call if_changed,initfs)
64
65

Archive Download this file



interactive