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+#
+# 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 = $(obj)libdts.o
+
+$(if $(CONFIG_DEFAULT_DEVICE_TREE),,\
+$(error Please define CONFIG_DEFAULT_DEVICE_TREE in your board header file))
+DEVICE_TREE = $(subst ",,$(CONFIG_DEFAULT_DEVICE_TREE))
+
+$(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 := -DARCH_CPU_DTS=\"../arch/$(ARCH)/dts/$(CONFIG_ARCH_DEVICE_TREE).dtsi\"
+
+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
+ cat $< | $(CPP) -P $(DTS_CPPFLAGS) - >$@.tmp
+ $(DTC) -R 4 -p 0x1000 -O dtb -o ${DT_BIN} $@.tmp
+ rm $@.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: $(DT_BIN)
+ # We want the output format and arch.
+ # We also hope to win a prize for ugliest Makefile / shell interaction
+ # We look in the LDSCRIPT first.
+ # Then try the linker which should give us the answer.
+ # Then check it worked.
+ oformat=`$(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
+
+#########################################################################