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 include $(TOPDIR)/config.mk
14 ifeq ($(DEVICE_TREE),)
15 $(if $(CONFIG_DEFAULT_DEVICE_TREE),,\
16 $(error Please define CONFIG_DEFAULT_DEVICE_TREE in your board header file))
17 DEVICE_TREE = $(subst ",,$(CONFIG_DEFAULT_DEVICE_TREE))
20 $(if $(CONFIG_ARCH_DEVICE_TREE),,\
21 $(error Your architecture does not have device tree support enabled. \
22 Please define CONFIG_ARCH_DEVICE_TREE))
24 # We preprocess the device tree file provide a useful define
25 DTS_CPPFLAGS := -x assembler-with-cpp \
26 -DARCH_CPU_DTS=\"$(SRCTREE)/arch/$(ARCH)/dts/$(CONFIG_ARCH_DEVICE_TREE).dtsi\" \
27 -DBOARD_DTS=\"$(SRCTREE)/board/$(VENDOR)/$(BOARD)/dts/$(DEVICE_TREE).dts\" \
28 -I$(SRCTREE)/board/$(VENDOR)/dts -I$(SRCTREE)/arch/$(ARCH)/dts
30 all: $(obj).depend $(LIB)
32 # Use a constant name for this so we can access it from C code.
33 # objcopy doesn't seem to allow us to set the symbol name independently of
35 DT_BIN := $(obj)dt.dtb
37 $(DT_BIN): $(TOPDIR)/board/$(VENDOR)/dts/$(DEVICE_TREE).dts
39 cat $< | $(CPP) -P $(DTS_CPPFLAGS) - | \
40 { { $(DTC) -R 4 -p 0x1000 -O dtb -o ${DT_BIN} - 2>&1 ; \
42 grep -v '^DTC: dts->dtb on file' ; \
47 $(1) | sed -r -n 's/^OUTPUT_$(2)[ ("]*([^")]*).*/\1/p'
49 # Run the compiler and get the link script from the linker
50 GET_LDS = $(CC) $(CFLAGS) $(LDFLAGS) -Wl,--verbose 2>&1
53 # We want the output format and arch.
54 # We also hope to win a prize for ugliest Makefile / shell interaction
55 # We look in the LDSCRIPT first.
56 # Then try the linker which should give us the answer.
57 # Then check it worked.
58 [ -n "$(LDSCRIPT)" ] && \
59 oformat=`$(call process_lds,cat $(LDSCRIPT),FORMAT)` && \
60 oarch=`$(call process_lds,cat $(LDSCRIPT),ARCH)` ;\
62 [ -z $${oformat} ] && \
63 oformat=`$(call process_lds,$(GET_LDS),FORMAT)` ;\
65 oarch=`$(call process_lds,$(GET_LDS),ARCH)` ;\
67 [ -z $${oformat} ] && \
68 echo "Cannot read OUTPUT_FORMAT from lds file $(LDSCRIPT)" && \
71 echo "Cannot read OUTPUT_ARCH from lds file $(LDSCRIPT)" && \
74 cd $(dir ${DT_BIN}) && \
75 $(OBJCOPY) -I binary -O $${oformat} -B $${oarch} \
76 $(notdir ${DT_BIN}) $@
79 OBJS-$(CONFIG_OF_EMBED) := dt.o
83 OBJS := $(addprefix $(obj),$(COBJS))
87 $(LIB): $(OBJS) $(DTB)
88 $(call cmd_link_o_target, $(OBJS))
90 #########################################################################
92 # defines $(obj).depend target
93 include $(SRCTREE)/rules.mk
95 sinclude $(obj).depend
97 #########################################################################