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Commit | Line | Data |
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d39a206b SR |
1 | # |
2 | # kbuild file for usr/ - including initramfs image | |
3 | # | |
1da177e4 | 4 | |
d39a206b | 5 | klibcdirs:; |
48f1f058 SR |
6 | PHONY += klibcdirs |
7 | ||
a26ee60f AK |
8 | # 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 | |
15 | suffix_y = | |
16 | ||
17 | # Lzma, but no gzip nor bzip2 | |
18 | suffix_$(CONFIG_RD_LZMA) = .lzma | |
19 | ||
20 | # Gzip, but no bzip2 | |
21 | suffix_$(CONFIG_RD_GZIP) = .gz | |
22 | ||
23 | # Bzip2 | |
24 | suffix_$(CONFIG_RD_BZIP2) = .bz2 | |
25 | ||
1da177e4 | 26 | |
d39a206b | 27 | # Generate builtin.o based on initramfs_data.o |
a26ee60f | 28 | obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data$(suffix_y).o |
1da177e4 | 29 | |
a26ee60f | 30 | # initramfs_data.o contains the compressed initramfs_data.cpio image. |
1da177e4 LT |
31 | # The image is included using .incbin, a dependency which is not |
32 | # tracked automatically. | |
a26ee60f | 33 | $(obj)/initramfs_data$(suffix_y).o: $(obj)/initramfs_data.cpio$(suffix_y) FORCE |
1da177e4 | 34 | |
d39a206b SR |
35 | ##### |
36 | # Generate the initramfs cpio archive | |
37 | ||
38 | hostprogs-y := gen_init_cpio | |
39 | initramfs := $(CONFIG_SHELL) $(srctree)/scripts/gen_initramfs_list.sh | |
40 | ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \ | |
a26d79ca | 41 | $(shell echo $(CONFIG_INITRAMFS_SOURCE)),-d) |
d39a206b SR |
42 | ramfs-args := \ |
43 | $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \ | |
ff541710 | 44 | $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID)) |
d39a206b | 45 | |
a26ee60f | 46 | # .initramfs_data.cpio.d is used to identify all files included |
d39a206b SR |
47 | # in initramfs and to detect if any files are added/removed. |
48 | # Removed files are identified by directory timestamp being updated | |
49 | # The dependency list is generated by gen_initramfs.sh -l | |
a26ee60f AK |
50 | ifneq ($(wildcard $(obj)/.initramfs_data.cpio.d),) |
51 | include $(obj)/.initramfs_data.cpio.d | |
1da177e4 LT |
52 | endif |
53 | ||
d39a206b SR |
54 | quiet_cmd_initfs = GEN $@ |
55 | cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input) | |
56 | ||
a26ee60f | 57 | targets := initramfs_data.cpio.gz initramfs_data.cpio.bz2 initramfs_data.cpio.lzma initramfs_data.cpio |
58a2f7d8 SR |
58 | # do not try to update files included in initramfs |
59 | $(deps_initramfs): ; | |
60 | ||
d39a206b | 61 | $(deps_initramfs): klibcdirs |
a26ee60f AK |
62 | # We rebuild initramfs_data.cpio if: |
63 | # 1) Any included file is newer then initramfs_data.cpio | |
d39a206b | 64 | # 2) There are changes in which files are included (added or deleted) |
a26ee60f | 65 | # 3) If gen_init_cpio are newer than initramfs_data.cpio |
d39a206b | 66 | # 4) arguments to gen_initramfs.sh changes |
a26ee60f AK |
67 | $(obj)/initramfs_data.cpio$(suffix_y): $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs |
68 | $(Q)$(initramfs) -l $(ramfs-input) > $(obj)/.initramfs_data.cpio.d | |
d39a206b | 69 | $(call if_changed,initfs) |
1da177e4 | 70 |