usr/Makefile

   1 #
   2 # kbuild file for usr/ - including initramfs image
   3 #
   4
   5 klibcdirs:;
   6 PHONY += klibcdirs
   7
   8
   9 # Gzip
  10 suffix_$(CONFIG_INITRAMFS_COMPRESSION_GZIP)   = .gz
  11
  12 # Bzip2
  13 suffix_$(CONFIG_INITRAMFS_COMPRESSION_BZIP2)  = .bz2
  14
  15 # Lzma
  16 suffix_$(CONFIG_INITRAMFS_COMPRESSION_LZMA)   = .lzma
  17
  18 # Lzo
  19 suffix_$(CONFIG_INITRAMFS_COMPRESSION_LZO)   = .lzo
  20
  21 # Generate builtin.o based on initramfs_data.o
  22 obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data$(suffix_y).o
  23
  24 # initramfs_data.o contains the compressed initramfs_data.cpio image.
  25 # The image is included using .incbin, a dependency which is not
  26 # tracked automatically.
  27 $(obj)/initramfs_data$(suffix_y).o: $(obj)/initramfs_data.cpio$(suffix_y) FORCE
  28
  29 #####
  30 # Generate the initramfs cpio archive
  31
  32 hostprogs-y := gen_init_cpio
  33 initramfs   := $(CONFIG_SHELL) $(srctree)/scripts/gen_initramfs_list.sh
  34 ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \
  35                         $(shell echo $(CONFIG_INITRAMFS_SOURCE)),-d)
  36 ramfs-args  := \
  37         $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \
  38         $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID))
  39
  40 # .initramfs_data.cpio.d is used to identify all files included
  41 # in initramfs and to detect if any files are added/removed.
  42 # Removed files are identified by directory timestamp being updated
  43 # The dependency list is generated by gen_initramfs.sh -l
  44 ifneq ($(wildcard $(obj)/.initramfs_data.cpio.d),)
  45         include $(obj)/.initramfs_data.cpio.d
  46 endif
  47
  48 quiet_cmd_initfs = GEN     $@
  49       cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input)
  50
  51 targets := initramfs_data.cpio.gz initramfs_data.cpio.bz2 initramfs_data.cpio.lzma initramfs_data.cpio.lzo initramfs_data.cpio
  52 # do not try to update files included in initramfs
  53 $(deps_initramfs): ;
  54
  55 $(deps_initramfs): klibcdirs
  56 # We rebuild initramfs_data.cpio if:
  57 # 1) Any included file is newer then initramfs_data.cpio
  58 # 2) There are changes in which files are included (added or deleted)
  59 # 3) If gen_init_cpio are newer than initramfs_data.cpio
  60 # 4) arguments to gen_initramfs.sh changes
  61 $(obj)/initramfs_data.cpio$(suffix_y): $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs
  62         $(Q)$(initramfs) -l $(ramfs-input) > $(obj)/.initramfs_data.cpio.d
  63         $(call if_changed,initfs)
  64