xref: /openbmc/u-boot/dts/Makefile (revision ac45bb16) 
1#
2# Copyright (c) 2011 The Chromium OS Authors.
3#
4# SPDX-License-Identifier:	GPL-2.0+
5#
6
7# This Makefile builds the internal U-Boot fdt if CONFIG_OF_CONTROL is
8# enabled. See doc/README.fdt-control for more details.
9
10ifeq ($(DEVICE_TREE),)
11$(if $(CONFIG_DEFAULT_DEVICE_TREE),,\
12$(error Please define CONFIG_DEFAULT_DEVICE_TREE in your board header file))
13DEVICE_TREE = $(subst ",,$(CONFIG_DEFAULT_DEVICE_TREE))
14endif
15
16DTS_INCDIRS =  $(SRCTREE)/board/$(VENDOR)/$(BOARD)/dts
17DTS_INCDIRS += $(SRCTREE)/board/$(VENDOR)/dts
18DTS_INCDIRS += $(SRCTREE)/arch/$(ARCH)/dts
19
20DTS_CPPFLAGS := -x assembler-with-cpp -undef -D__DTS__ \
21		-nostdinc $(addprefix -I,$(DTS_INCDIRS))
22
23DTC_FLAGS := -R 4 -p 0x1000 \
24	$(addprefix -i ,$(DTS_INCDIRS))
25
26# Use a constant name for this so we can access it from C code.
27# objcopy doesn't seem to allow us to set the symbol name independently of
28# the filename.
29DT_BIN	:= $(obj)dt.dtb
30
31$(DT_BIN): $(TOPDIR)/board/$(VENDOR)/dts/$(DEVICE_TREE).dts
32	$(CPP) $(DTS_CPPFLAGS) $< -o $(DT_BIN).dts.tmp
33	$(DTC) $(DTC_FLAGS) -O dtb -o ${DT_BIN} $(DT_BIN).dts.tmp
34
35process_lds = \
36	$(1) | sed -r -n 's/^OUTPUT_$(2)[ ("]*([^")]*).*/\1/p'
37
38# Run the compiler and get the link script from the linker
39GET_LDS = $(CC) $(CFLAGS) $(LDFLAGS) -Wl,--verbose 2>&1
40
41$(obj)dt.o: $(DT_BIN)
42	# We want the output format and arch.
43	# We also hope to win a prize for ugliest Makefile / shell interaction
44	# We look in the LDSCRIPT first.
45	# Then try the linker which should give us the answer.
46	# Then check it worked.
47	[ -n "$(LDSCRIPT)" ] && \
48		oformat=`$(call process_lds,cat $(LDSCRIPT),FORMAT)` && \
49		oarch=`$(call process_lds,cat $(LDSCRIPT),ARCH)` ;\
50	\
51	[ -z $${oformat} ] && \
52		oformat=`$(call process_lds,$(GET_LDS),FORMAT)` ;\
53	[ -z $${oarch} ] && \
54		oarch=`$(call process_lds,$(GET_LDS),ARCH)` ;\
55	\
56	[ -z $${oformat} ] && \
57		echo "Cannot read OUTPUT_FORMAT from lds file $(LDSCRIPT)" && \
58		exit 1 || true ;\
59	[ -z $${oarch} ] && \
60		echo "Cannot read OUTPUT_ARCH from lds file $(LDSCRIPT)" && \
61		exit 1 || true ;\
62	\
63	cd $(dir ${DT_BIN}) && \
64	$(OBJCOPY) -I binary -O $${oformat} -B $${oarch} \
65		$(notdir ${DT_BIN}) $@
66	rm $(DT_BIN)
67
68obj-$(CONFIG_OF_EMBED)	:= dt.o
69
70binary:	$(DT_BIN)
71