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usr/Makefile
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# # kbuild file for usr/ - including initramfs image # |
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klibcdirs:; |
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PHONY += klibcdirs |
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# Gzip |
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suffix_$(CONFIG_INITRAMFS_COMPRESSION_GZIP) = .gz |
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# Bzip2 |
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suffix_$(CONFIG_INITRAMFS_COMPRESSION_BZIP2) = .bz2 |
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# Lzma suffix_$(CONFIG_INITRAMFS_COMPRESSION_LZMA) = .lzma |
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# XZ suffix_$(CONFIG_INITRAMFS_COMPRESSION_XZ) = .xz |
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# Lzo suffix_$(CONFIG_INITRAMFS_COMPRESSION_LZO) = .lzo |
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AFLAGS_initramfs_data.o += -DINITRAMFS_IMAGE="usr/initramfs_data.cpio$(suffix_y)" |
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# Generate builtin.o based on initramfs_data.o |
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obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o |
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# initramfs_data.o contains the compressed initramfs_data.cpio image. |
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# The image is included using .incbin, a dependency which is not # tracked automatically. |
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$(obj)/initramfs_data.o: $(obj)/initramfs_data.cpio$(suffix_y) FORCE |
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##### # Generate the initramfs cpio archive hostprogs-y := gen_init_cpio initramfs := $(CONFIG_SHELL) $(srctree)/scripts/gen_initramfs_list.sh ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \ |
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$(shell echo $(CONFIG_INITRAMFS_SOURCE)),-d) |
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ramfs-args := \ $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \ |
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$(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID)) |
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# .initramfs_data.cpio.d is used to identify all files included |
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# in initramfs and to detect if any files are added/removed. # Removed files are identified by directory timestamp being updated # The dependency list is generated by gen_initramfs.sh -l |
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ifneq ($(wildcard $(obj)/.initramfs_data.cpio.d),) include $(obj)/.initramfs_data.cpio.d |
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endif |
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quiet_cmd_initfs = GEN $@ cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input) |
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targets := initramfs_data.cpio.gz initramfs_data.cpio.bz2 initramfs_data.cpio.lzma initramfs_data.cpio.xz initramfs_data.cpio.lzo initramfs_data.cpio |
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# do not try to update files included in initramfs $(deps_initramfs): ; |
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$(deps_initramfs): klibcdirs |
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# We rebuild initramfs_data.cpio if: # 1) Any included file is newer then initramfs_data.cpio |
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# 2) There are changes in which files are included (added or deleted) |
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# 3) If gen_init_cpio are newer than initramfs_data.cpio |
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# 4) arguments to gen_initramfs.sh changes |
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$(obj)/initramfs_data.cpio$(suffix_y): $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs $(Q)$(initramfs) -l $(ramfs-input) > $(obj)/.initramfs_data.cpio.d |
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$(call if_changed,initfs) |
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