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