#
  # Copyright (c) 2011 The Chromium OS Authors.
  #
  # See file CREDITS for list of people who contributed to this
  # project.
  #
  # This program is free software; you can redistribute it and/or
  # modify it under the terms of the GNU General Public License as
  # published by the Free Software Foundatio; either version 2 of
  # the License, or (at your option) any later version.
  #
  # This program is distributed in the hope that it will be useful,
  # but WITHOUT ANY WARRANTY; without even the implied warranty of
  # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	See the
  # GNU General Public License for more details.
  #
  # You should have received a copy of the GNU General Public License
  # along with this program; if not, write to the Free Software
  # Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  # MA 02111-1307 USA
  #
  
  # This Makefile builds the internal U-Boot fdt if CONFIG_OF_CONTROL is
  # enabled. See doc/README.fdt-control for more details.
  
  include $(TOPDIR)/config.mk
  
  LIB	= $(obj)libdts.o

  ifeq ($(DEVICE_TREE),)

  $(if $(CONFIG_DEFAULT_DEVICE_TREE),,\
  $(error Please define CONFIG_DEFAULT_DEVICE_TREE in your board header file))
  DEVICE_TREE = $(subst ",,$(CONFIG_DEFAULT_DEVICE_TREE))

  endif

  
  $(if $(CONFIG_ARCH_DEVICE_TREE),,\
  $(error Your architecture does not have device tree support enabled. \
  Please define CONFIG_ARCH_DEVICE_TREE))
  
  # We preprocess the device tree file provide a useful define

  DTS_CPPFLAGS := -x assembler-with-cpp \

  		-DARCH_CPU_DTS=\"$(SRCTREE)/arch/$(ARCH)/dts/$(CONFIG_ARCH_DEVICE_TREE).dtsi\" \

  		-DBOARD_DTS=\"$(SRCTREE)/board/$(VENDOR)/$(BOARD)/dts/$(DEVICE_TREE).dts\" \
  		-I$(SRCTREE)/board/$(VENDOR)/dts -I$(SRCTREE)/arch/$(ARCH)/dts

  
  all:	$(obj).depend $(LIB)
  
  # Use a constant name for this so we can access it from C code.
  # objcopy doesn't seem to allow us to set the symbol name independently of
  # the filename.
  DT_BIN	:= $(obj)dt.dtb
  
  $(DT_BIN): $(TOPDIR)/board/$(VENDOR)/dts/$(DEVICE_TREE).dts

  	rc=$$( \
  		cat $< | $(CPP) -P $(DTS_CPPFLAGS) - | \
  		{ { $(DTC) -R 4 -p 0x1000 -O dtb -o ${DT_BIN} - 2>&1 ; \
  		    echo $$? >&3 ; } | \
  		  grep -v '^DTC: dts->dtb  on file' ; \

  	        } 3>&1 1>&2 ) ; \

  	exit $$rc

  
  process_lds = \
  	$(1) | sed -r -n 's/^OUTPUT_$(2)[ ("]*([^")]*).*/\1/p'
  
  # Run the compiler and get the link script from the linker
  GET_LDS = $(CC) $(CFLAGS) $(LDFLAGS) -Wl,--verbose 2>&1
  
  $(obj)dt.o: $(DT_BIN)
  	# We want the output format and arch.
  	# We also hope to win a prize for ugliest Makefile / shell interaction
  	# We look in the LDSCRIPT first.
  	# Then try the linker which should give us the answer.
  	# Then check it worked.

  	[ -n "$(LDSCRIPT)" ] && \
  		oformat=`$(call process_lds,cat $(LDSCRIPT),FORMAT)` && \
  		oarch=`$(call process_lds,cat $(LDSCRIPT),ARCH)` ;\

  	\
  	[ -z $${oformat} ] && \
  		oformat=`$(call process_lds,$(GET_LDS),FORMAT)` ;\
  	[ -z $${oarch} ] && \
  		oarch=`$(call process_lds,$(GET_LDS),ARCH)` ;\
  	\
  	[ -z $${oformat} ] && \
  		echo "Cannot read OUTPUT_FORMAT from lds file $(LDSCRIPT)" && \
  		exit 1 || true ;\
  	[ -z $${oarch} ] && \
  		echo "Cannot read OUTPUT_ARCH from lds file $(LDSCRIPT)" && \
  		exit 1 || true ;\
  	\
  	cd $(dir ${DT_BIN}) && \
  	$(OBJCOPY) -I binary -O $${oformat} -B $${oarch} \
  		$(notdir ${DT_BIN}) $@
  	rm $(DT_BIN)
  
  OBJS-$(CONFIG_OF_EMBED)	:= dt.o
  
  COBJS	:= $(OBJS-y)
  
  OBJS	:= $(addprefix $(obj),$(COBJS))
  
  binary:	$(DT_BIN)
  
  $(LIB):	$(OBJS) $(DTB)
  	$(call cmd_link_o_target, $(OBJS))
  
  #########################################################################
  
  # defines $(obj).depend target
  include $(SRCTREE)/rules.mk
  
  sinclude $(obj).depend
  
  #########################################################################