mirror of
https://github.com/AsahiLinux/u-boot
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70 lines
2.1 KiB
Makefile
70 lines
2.1 KiB
Makefile
#
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# Copyright (c) 2011 The Chromium OS Authors.
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#
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# SPDX-License-Identifier: GPL-2.0+
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#
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# This Makefile builds the internal U-Boot fdt if CONFIG_OF_CONTROL is
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# enabled. See doc/README.fdt-control for more details.
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ifeq ($(DEVICE_TREE),)
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$(if $(CONFIG_DEFAULT_DEVICE_TREE),,\
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$(error Please define CONFIG_DEFAULT_DEVICE_TREE in your board header file))
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DEVICE_TREE = $(subst ",,$(CONFIG_DEFAULT_DEVICE_TREE))
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endif
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DTS_INCDIRS = $(SRCTREE)/board/$(VENDOR)/$(BOARD)/dts
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DTS_INCDIRS += $(SRCTREE)/board/$(VENDOR)/dts
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DTS_INCDIRS += $(SRCTREE)/arch/$(ARCH)/dts
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DTS_CPPFLAGS := -x assembler-with-cpp -undef -D__DTS__ \
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-nostdinc $(addprefix -I,$(DTS_INCDIRS))
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DTC_FLAGS := -R 4 -p 0x1000 \
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$(addprefix -i ,$(DTS_INCDIRS))
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# Use a constant name for this so we can access it from C code.
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# objcopy doesn't seem to allow us to set the symbol name independently of
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# the filename.
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DT_BIN := $(obj)dt.dtb
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$(DT_BIN): $(TOPDIR)/board/$(VENDOR)/dts/$(DEVICE_TREE).dts
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$(CPP) $(DTS_CPPFLAGS) $< -o $(DT_BIN).dts.tmp
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$(DTC) $(DTC_FLAGS) -O dtb -o ${DT_BIN} $(DT_BIN).dts.tmp
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process_lds = \
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$(1) | sed -r -n 's/^OUTPUT_$(2)[ ("]*([^")]*).*/\1/p'
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# Run the compiler and get the link script from the linker
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GET_LDS = $(CC) $(CFLAGS) $(LDFLAGS) -Wl,--verbose 2>&1
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$(obj)dt.o: $(DT_BIN)
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# We want the output format and arch.
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# We also hope to win a prize for ugliest Makefile / shell interaction
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# We look in the LDSCRIPT first.
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# Then try the linker which should give us the answer.
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# Then check it worked.
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[ -n "$(LDSCRIPT)" ] && \
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oformat=`$(call process_lds,cat $(LDSCRIPT),FORMAT)` && \
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oarch=`$(call process_lds,cat $(LDSCRIPT),ARCH)` ;\
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\
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[ -z $${oformat} ] && \
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oformat=`$(call process_lds,$(GET_LDS),FORMAT)` ;\
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[ -z $${oarch} ] && \
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oarch=`$(call process_lds,$(GET_LDS),ARCH)` ;\
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\
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[ -z $${oformat} ] && \
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echo "Cannot read OUTPUT_FORMAT from lds file $(LDSCRIPT)" && \
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exit 1 || true ;\
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[ -z $${oarch} ] && \
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echo "Cannot read OUTPUT_ARCH from lds file $(LDSCRIPT)" && \
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exit 1 || true ;\
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\
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cd $(dir ${DT_BIN}) && \
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$(OBJCOPY) -I binary -O $${oformat} -B $${oarch} \
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$(notdir ${DT_BIN}) $@
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rm $(DT_BIN)
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obj-$(CONFIG_OF_EMBED) := dt.o
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binary: $(DT_BIN)
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