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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),,\
$(error Your architecture does not have device tree support enabled. \
Please define CONFIG_ARCH_DEVICE_TREE))
# We preprocess the device tree file provide a useful define
DTS_CPPFLAGS := -DARCH_CPU_DTS=\"$(SRCTREE)/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
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 ) ; \
exit $$rc
process_lds = \
$(1) | sed -r -n 's/^OUTPUT_$(2)[ ("]*([^")]*).*/\1/p'
# Run the compiler and get the link script from the linker
GET_LDS = $(CC) $(CFLAGS) $(LDFLAGS) -Wl,--verbose 2>&1
$(obj)dt.o: $(DT_BIN)
# We want the output format and arch.
# We also hope to win a prize for ugliest Makefile / shell interaction
# We look in the LDSCRIPT first.
# Then try the linker which should give us the answer.
# Then check it worked.
oformat=`$(call process_lds,cat $(LDSCRIPT),FORMAT)` ;\
oarch=`$(call process_lds,cat $(LDSCRIPT),ARCH)` ;\
\
[ -z $${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
#########################################################################
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