#
  # kbuild file for usr/ - including initramfs image
  #

  klibcdirs:;

  PHONY += klibcdirs

  # Generate builtin.o based on initramfs_data.o
  obj-y := initramfs_data.o

  
  # initramfs_data.o contains the initramfs_data.cpio.gz image.
  # The image is included using .incbin, a dependency which is not
  # tracked automatically.
  $(obj)/initramfs_data.o: $(obj)/initramfs_data.cpio.gz 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.gz.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.gz.d),)
  	include $(obj)/.initramfs_data.cpio.gz.d

  endif

  quiet_cmd_initfs = GEN     $@
        cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input)
  
  targets := initramfs_data.cpio.gz

  # do not try to update files included in initramfs
  $(deps_initramfs): ;

  $(deps_initramfs): klibcdirs
  # We rebuild initramfs_data.cpio.gz if:
  # 1) Any included file is newer then initramfs_data.cpio.gz
  # 2) There are changes in which files are included (added or deleted)
  # 3) If gen_init_cpio are newer than initramfs_data.cpio.gz
  # 4) arguments to gen_initramfs.sh changes
  $(obj)/initramfs_data.cpio.gz: $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs
  	$(Q)$(initramfs) -l $(ramfs-input) > $(obj)/.initramfs_data.cpio.gz.d
  	$(call if_changed,initfs)