usr/Makefile

   1 #
   2 # kbuild file for usr/ - including initramfs image
   3 #
   4
   5 klibcdirs:;
   6 PHONY += klibcdirs
   7
   8
   9 # Generate builtin.o based on initramfs_data.o
  10 obj-y := initramfs_data.o
  11
  12 # initramfs_data.o contains the initramfs_data.cpio.gz image.
  13 # The image is included using .incbin, a dependency which is not
  14 # tracked automatically.
  15 $(obj)/initramfs_data.o: $(obj)/initramfs_data.cpio.gz FORCE
  16
  17 #####
  18 # Generate the initramfs cpio archive
  19
  20 hostprogs-y := gen_init_cpio
  21 initramfs   := $(CONFIG_SHELL) $(srctree)/scripts/gen_initramfs_list.sh
  22 ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \
  23                         $(shell echo $(CONFIG_INITRAMFS_SOURCE)),-d)
  24 ramfs-args  := \
  25         $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \
  26         $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID))
  27
  28 # .initramfs_data.cpio.gz.d is used to identify all files included
  29 # in initramfs and to detect if any files are added/removed.
  30 # Removed files are identified by directory timestamp being updated
  31 # The dependency list is generated by gen_initramfs.sh -l
  32 ifneq ($(wildcard $(obj)/.initramfs_data.cpio.gz.d),)
  33         include $(obj)/.initramfs_data.cpio.gz.d
  34 endif
  35
  36 quiet_cmd_initfs = GEN     $@
  37       cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input)
  38
  39 targets := initramfs_data.cpio.gz
  40 # do not try to update files included in initramfs
  41 $(deps_initramfs): ;
  42
  43 $(deps_initramfs): klibcdirs
  44 # We rebuild initramfs_data.cpio.gz if:
  45 # 1) Any included file is newer then initramfs_data.cpio.gz
  46 # 2) There are changes in which files are included (added or deleted)
  47 # 3) If gen_init_cpio are newer than initramfs_data.cpio.gz
  48 # 4) arguments to gen_initramfs.sh changes
  49 $(obj)/initramfs_data.cpio.gz: $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs
  50         $(Q)$(initramfs) -l $(ramfs-input) > $(obj)/.initramfs_data.cpio.gz.d
  51         $(call if_changed,initfs)
  52