| | 1 | # |
| | 2 | # kbuild file for usr/ - including initramfs image |
| | 3 | # |
| | 4 | |
| | 5 | klibcdirs:; |
| | 6 | PHONY += klibcdirs |
| | 7 | |
| | 8 | |
| | 9 | # Gzip |
| | 10 | suffix_$(CONFIG_INITRAMFS_COMPRESSION_GZIP) = .gz |
| | 11 | |
| | 12 | # Bzip2 |
| | 13 | suffix_$(CONFIG_INITRAMFS_COMPRESSION_BZIP2) = .bz2 |
| | 14 | |
| | 15 | # Lzma |
| | 16 | suffix_$(CONFIG_INITRAMFS_COMPRESSION_LZMA) = .lzma |
| | 17 | |
| | 18 | # Lzo |
| | 19 | suffix_$(CONFIG_INITRAMFS_COMPRESSION_LZO) = .lzo |
| | 20 | |
| | 21 | # Generate builtin.o based on initramfs_data.o |
| | 22 | obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data$(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 | |
| | 32 | hostprogs-y := gen_init_cpio |
| | 33 | initramfs := $(CONFIG_SHELL) $(srctree)/scripts/gen_initramfs_list.sh |
| | 34 | ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \ |
| | 35 | $(shell echo $(CONFIG_INITRAMFS_SOURCE)),-d) |
| | 36 | ramfs-args := \ |
| | 37 | $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \ |
| | 38 | $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID)) |
| | 39 | |
| | 40 | # .initramfs_data.cpio.d is used to identify all files included |
| | 41 | # in initramfs and to detect if any files are added/removed. |
| | 42 | # Removed files are identified by directory timestamp being updated |
| | 43 | # The dependency list is generated by gen_initramfs.sh -l |
| | 44 | ifneq ($(wildcard $(obj)/.initramfs_data.cpio.d),) |
| | 45 | include $(obj)/.initramfs_data.cpio.d |
| | 46 | endif |
| | 47 | |
| | 48 | quiet_cmd_initfs = GEN $@ |
| | 49 | cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input) |
| | 50 | |
| | 51 | targets := 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 | |
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