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 ifeq ($(DEVICE_TREE),)
11 $(if $(CONFIG_DEFAULT_DEVICE_TREE),,\
12 $(error Please define CONFIG_DEFAULT_DEVICE_TREE in your board header file))
13 DEVICE_TREE = $(subst ",,$(CONFIG_DEFAULT_DEVICE_TREE))
16 DTS_INCDIRS = $(SRCTREE)/board/$(VENDOR)/$(BOARD)/dts
17 DTS_INCDIRS += $(SRCTREE)/board/$(VENDOR)/dts
18 DTS_INCDIRS += $(SRCTREE)/arch/$(ARCH)/dts
20 DTS_CPPFLAGS := -x assembler-with-cpp -undef -D__DTS__ \
21 -nostdinc $(addprefix -I,$(DTS_INCDIRS))
23 DTC_FLAGS := -R 4 -p 0x1000 \
24 $(addprefix -i ,$(DTS_INCDIRS))
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
29 DT_BIN := $(obj)dt.dtb
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
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) $(CFLAGS) $(LDFLAGS) -Wl,--verbose 2>&1
42 # We want the output format and arch.
43 # We also hope to win a prize for ugliest Makefile / shell interaction
44 # We look in the LDSCRIPT first.
45 # Then try the linker which should give us the answer.
46 # Then check it worked.
47 [ -n "$(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}) $@
68 obj-$(CONFIG_OF_EMBED) := dt.o