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- #
- # kbuild file for usr/ - including initramfs image
- #
- klibcdirs:;
- PHONY += klibcdirs
- suffix_y = $(CONFIG_INITRAMFS_COMPRESSION)
- AFLAGS_initramfs_data.o += -DINITRAMFS_IMAGE="usr/initramfs_data.cpio$(suffix_y)"
- # Generate builtin.o based on initramfs_data.o
- obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o
- # initramfs_data.o contains the compressed initramfs_data.cpio image.
- # The image is included using .incbin, a dependency which is not
- # tracked automatically.
- $(obj)/initramfs_data.o: $(obj)/initramfs_data.cpio$(suffix_y) FORCE
- #####
- # 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)), \
- $(shell echo $(CONFIG_INITRAMFS_SOURCE)),-d)
- ramfs-args := \
- $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \
- $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID))
- # .initramfs_data.cpio.d is used to identify all files included
- # in initramfs and to detect if any files are added/removed.
- # Removed files are identified by directory timestamp being updated
- # The dependency list is generated by gen_initramfs.sh -l
- ifneq ($(wildcard $(obj)/.initramfs_data.cpio.d),)
- include $(obj)/.initramfs_data.cpio.d
- endif
- quiet_cmd_initfs = GEN $@
- cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input)
- targets := initramfs_data.cpio.gz initramfs_data.cpio.bz2 \
- initramfs_data.cpio.lzma initramfs_data.cpio.xz \
- initramfs_data.cpio.lzo initramfs_data.cpio.lz4 \
- initramfs_data.cpio
- # do not try to update files included in initramfs
- $(deps_initramfs): ;
- $(deps_initramfs): klibcdirs
- # We rebuild initramfs_data.cpio if:
- # 1) Any included file is newer then initramfs_data.cpio
- # 2) There are changes in which files are included (added or deleted)
- # 3) If gen_init_cpio are newer than initramfs_data.cpio
- # 4) arguments to gen_initramfs.sh changes
- $(obj)/initramfs_data.cpio$(suffix_y): $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs
- $(Q)$(initramfs) -l $(ramfs-input) > $(obj)/.initramfs_data.cpio.d
- $(call if_changed,initfs)
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