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#
# 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.
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))
# 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
DEVICE_TREE ?= $(CONFIG_DEFAULT_DEVICE_TREE:"%"=%)
ifeq ($(DEVICE_TREE),)
$(DT_BIN): FORCE
echo >&2 "Please define CONFIG_DEFAULT_DEVICE_TREE in your board header file"
else
$(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
endif
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) $(c_flags) $(ld_flags) -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}) $(notdir $@)
rm $(DT_BIN)
obj-$(CONFIG_OF_EMBED) := dt.o
binary: $(DT_BIN)
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