2 # Copyright (c) 2011 The Chromium OS Authors.
4 # SPDX-License-Identifier: GPL-2.0+
7 # This Makefile builds the internal U-Boot fdt if CONFIG_OF_CONTROL is
8 # enabled. See doc/README.fdt-control for more details.
10 DTS_INCDIRS = $(SRCTREE)/board/$(VENDOR)/$(BOARD)/dts
11 DTS_INCDIRS += $(SRCTREE)/board/$(VENDOR)/dts
12 DTS_INCDIRS += $(SRCTREE)/arch/$(ARCH)/dts
14 DTS_CPPFLAGS := -x assembler-with-cpp -undef -D__DTS__ \
15 -nostdinc $(addprefix -I,$(DTS_INCDIRS))
17 DTC_FLAGS := -R 4 -p 0x1000 \
18 $(addprefix -i ,$(DTS_INCDIRS))
20 # Use a constant name for this so we can access it from C code.
21 # objcopy doesn't seem to allow us to set the symbol name independently of
23 DT_BIN := $(obj)/dt.dtb
25 DEVICE_TREE ?= $(CONFIG_DEFAULT_DEVICE_TREE:"%"=%)
26 ifeq ($(DEVICE_TREE),)
28 echo >&2 "Please define CONFIG_DEFAULT_DEVICE_TREE in your board header file"
30 $(DT_BIN): $(TOPDIR)/board/$(VENDOR)/dts/$(DEVICE_TREE).dts
31 $(CPP) $(DTS_CPPFLAGS) $< -o $(DT_BIN).dts.tmp
32 $(DTC) $(DTC_FLAGS) -O dtb -o ${DT_BIN} $(DT_BIN).dts.tmp
36 $(1) | sed -r -n 's/^OUTPUT_$(2)[ ("]*([^")]*).*/\1/p'
38 # Run the compiler and get the link script from the linker
39 GET_LDS = $(CC) $(c_flags) $(ld_flags) -Wl,--verbose 2>&1
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)` ;\
51 [ -z $${oformat} ] && \
52 oformat=`$(call process_lds,$(GET_LDS),FORMAT)` ;\
54 oarch=`$(call process_lds,$(GET_LDS),ARCH)` ;\
56 [ -z $${oformat} ] && \
57 echo "Cannot read OUTPUT_FORMAT from lds file $(LDSCRIPT)" && \
60 echo "Cannot read OUTPUT_ARCH from lds file $(LDSCRIPT)" && \
63 cd $(dir ${DT_BIN}) && \
64 $(OBJCOPY) -I binary -O $${oformat} -B $${oarch} \
65 $(notdir ${DT_BIN}) $(notdir $@)
68 obj-$(CONFIG_OF_EMBED) := dt.o