#
  # Copyright (c) 2011 The Chromium OS Authors.
  #

  # SPDX-License-Identifier:	GPL-2.0+

  #
  
  # 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

  DTS_INCDIRS =  $(SRCTREE)/board/$(VENDOR)/$(BOARD)/dts
  DTS_INCDIRS += $(SRCTREE)/board/$(VENDOR)/dts
  DTS_INCDIRS += $(SRCTREE)/arch/$(ARCH)/dts

  DTS_CPPFLAGS := -x assembler-with-cpp -undef -D__DTS__ \

  		-nostdinc $(addprefix -I,$(DTS_INCDIRS))
  
  DTC_FLAGS := -R 4 -p 0x1000 \
  	$(addprefix -i ,$(DTS_INCDIRS))

  
  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

  	$(CPP) $(DTS_CPPFLAGS) $< -o $(DT_BIN).dts.tmp

  	$(DTC) $(DTC_FLAGS) -O dtb -o ${DT_BIN} $(DT_BIN).dts.tmp

  
  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
  
  #########################################################################