1d39a206bSSam Ravnborg# 2d39a206bSSam Ravnborg# kbuild file for usr/ - including initramfs image 3d39a206bSSam Ravnborg# 41da177e4SLinus Torvalds 5d39a206bSSam Ravnborgklibcdirs:; 648f1f058SSam RavnborgPHONY += klibcdirs 748f1f058SSam Ravnborg 8*a26ee60fSAlain Knaff# Find out "preferred" ramdisk compressor. Order of preference is 9*a26ee60fSAlain Knaff# 1. bzip2 efficient, and likely to be present 10*a26ee60fSAlain Knaff# 2. gzip former default 11*a26ee60fSAlain Knaff# 3. lzma 12*a26ee60fSAlain Knaff# 4. none 13*a26ee60fSAlain Knaff 14*a26ee60fSAlain Knaff# None of the above 15*a26ee60fSAlain Knaffsuffix_y = 16*a26ee60fSAlain Knaff 17*a26ee60fSAlain Knaff# Lzma, but no gzip nor bzip2 18*a26ee60fSAlain Knaffsuffix_$(CONFIG_RD_LZMA) = .lzma 19*a26ee60fSAlain Knaff 20*a26ee60fSAlain Knaff# Gzip, but no bzip2 21*a26ee60fSAlain Knaffsuffix_$(CONFIG_RD_GZIP) = .gz 22*a26ee60fSAlain Knaff 23*a26ee60fSAlain Knaff# Bzip2 24*a26ee60fSAlain Knaffsuffix_$(CONFIG_RD_BZIP2) = .bz2 25*a26ee60fSAlain Knaff 26d39a206bSSam Ravnborg 27d39a206bSSam Ravnborg# Generate builtin.o based on initramfs_data.o 28*a26ee60fSAlain Knaffobj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data$(suffix_y).o 291da177e4SLinus Torvalds 30*a26ee60fSAlain Knaff# initramfs_data.o contains the compressed initramfs_data.cpio image. 311da177e4SLinus Torvalds# The image is included using .incbin, a dependency which is not 321da177e4SLinus Torvalds# tracked automatically. 33*a26ee60fSAlain Knaff$(obj)/initramfs_data$(suffix_y).o: $(obj)/initramfs_data.cpio$(suffix_y) FORCE 341da177e4SLinus Torvalds 35d39a206bSSam Ravnborg##### 36d39a206bSSam Ravnborg# Generate the initramfs cpio archive 37d39a206bSSam Ravnborg 38d39a206bSSam Ravnborghostprogs-y := gen_init_cpio 39d39a206bSSam Ravnborginitramfs := $(CONFIG_SHELL) $(srctree)/scripts/gen_initramfs_list.sh 40d39a206bSSam Ravnborgramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \ 41a26d79caSThomas Chou $(shell echo $(CONFIG_INITRAMFS_SOURCE)),-d) 42d39a206bSSam Ravnborgramfs-args := \ 43d39a206bSSam Ravnborg $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \ 44ff541710SNickolay $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID)) 45d39a206bSSam Ravnborg 46*a26ee60fSAlain Knaff# .initramfs_data.cpio.d is used to identify all files included 47d39a206bSSam Ravnborg# in initramfs and to detect if any files are added/removed. 48d39a206bSSam Ravnborg# Removed files are identified by directory timestamp being updated 49d39a206bSSam Ravnborg# The dependency list is generated by gen_initramfs.sh -l 50*a26ee60fSAlain Knaffifneq ($(wildcard $(obj)/.initramfs_data.cpio.d),) 51*a26ee60fSAlain Knaff include $(obj)/.initramfs_data.cpio.d 521da177e4SLinus Torvaldsendif 531da177e4SLinus Torvalds 54d39a206bSSam Ravnborgquiet_cmd_initfs = GEN $@ 55d39a206bSSam Ravnborg cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input) 561da177e4SLinus Torvalds 57*a26ee60fSAlain Knafftargets := initramfs_data.cpio.gz initramfs_data.cpio.bz2 initramfs_data.cpio.lzma initramfs_data.cpio 5858a2f7d8SSam Ravnborg# do not try to update files included in initramfs 5958a2f7d8SSam Ravnborg$(deps_initramfs): ; 6058a2f7d8SSam Ravnborg 61d39a206bSSam Ravnborg$(deps_initramfs): klibcdirs 62*a26ee60fSAlain Knaff# We rebuild initramfs_data.cpio if: 63*a26ee60fSAlain Knaff# 1) Any included file is newer then initramfs_data.cpio 64d39a206bSSam Ravnborg# 2) There are changes in which files are included (added or deleted) 65*a26ee60fSAlain Knaff# 3) If gen_init_cpio are newer than initramfs_data.cpio 66d39a206bSSam Ravnborg# 4) arguments to gen_initramfs.sh changes 67*a26ee60fSAlain Knaff$(obj)/initramfs_data.cpio$(suffix_y): $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs 68*a26ee60fSAlain Knaff $(Q)$(initramfs) -l $(ramfs-input) > $(obj)/.initramfs_data.cpio.d 69d39a206bSSam Ravnborg $(call if_changed,initfs) 701da177e4SLinus Torvalds 71