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