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 10include $(TOPDIR)/config.mk 11 12LIB = $(obj)libdts.o 13 14ifeq ($(DEVICE_TREE),) 15$(if $(CONFIG_DEFAULT_DEVICE_TREE),,\ 16$(error Please define CONFIG_DEFAULT_DEVICE_TREE in your board header file)) 17DEVICE_TREE = $(subst ",,$(CONFIG_DEFAULT_DEVICE_TREE)) 18endif 19 20$(if $(CONFIG_ARCH_DEVICE_TREE),,\ 21$(error Your architecture does not have device tree support enabled. \ 22Please define CONFIG_ARCH_DEVICE_TREE)) 23 24DTS_INCDIRS = $(SRCTREE)/board/$(VENDOR)/$(BOARD)/dts 25DTS_INCDIRS += $(SRCTREE)/board/$(VENDOR)/dts 26DTS_INCDIRS += $(SRCTREE)/arch/$(ARCH)/dts 27 28# We preprocess the device tree file provide a useful define 29DTS_CPPFLAGS := -x assembler-with-cpp \ 30 -DARCH_CPU_DTS=\"$(SRCTREE)/arch/$(ARCH)/dts/$(CONFIG_ARCH_DEVICE_TREE).dtsi\" \ 31 -DBOARD_DTS=\"$(SRCTREE)/board/$(VENDOR)/$(BOARD)/dts/$(DEVICE_TREE).dts\" \ 32 -nostdinc $(addprefix -I,$(DTS_INCDIRS)) 33 34DTC_FLAGS := -R 4 -p 0x1000 \ 35 $(addprefix -i ,$(DTS_INCDIRS)) 36 37all: $(obj).depend $(LIB) 38 39# Use a constant name for this so we can access it from C code. 40# objcopy doesn't seem to allow us to set the symbol name independently of 41# the filename. 42DT_BIN := $(obj)dt.dtb 43 44$(DT_BIN): $(TOPDIR)/board/$(VENDOR)/dts/$(DEVICE_TREE).dts 45 $(CPP) -P $(DTS_CPPFLAGS) $< -o $(DT_BIN).dts.tmp 46 $(DTC) $(DTC_FLAGS) -O dtb -o ${DT_BIN} $(DT_BIN).dts.tmp 47 48process_lds = \ 49 $(1) | sed -r -n 's/^OUTPUT_$(2)[ ("]*([^")]*).*/\1/p' 50 51# Run the compiler and get the link script from the linker 52GET_LDS = $(CC) $(CFLAGS) $(LDFLAGS) -Wl,--verbose 2>&1 53 54$(obj)dt.o: $(DT_BIN) 55 # We want the output format and arch. 56 # We also hope to win a prize for ugliest Makefile / shell interaction 57 # We look in the LDSCRIPT first. 58 # Then try the linker which should give us the answer. 59 # Then check it worked. 60 [ -n "$(LDSCRIPT)" ] && \ 61 oformat=`$(call process_lds,cat $(LDSCRIPT),FORMAT)` && \ 62 oarch=`$(call process_lds,cat $(LDSCRIPT),ARCH)` ;\ 63 \ 64 [ -z $${oformat} ] && \ 65 oformat=`$(call process_lds,$(GET_LDS),FORMAT)` ;\ 66 [ -z $${oarch} ] && \ 67 oarch=`$(call process_lds,$(GET_LDS),ARCH)` ;\ 68 \ 69 [ -z $${oformat} ] && \ 70 echo "Cannot read OUTPUT_FORMAT from lds file $(LDSCRIPT)" && \ 71 exit 1 || true ;\ 72 [ -z $${oarch} ] && \ 73 echo "Cannot read OUTPUT_ARCH from lds file $(LDSCRIPT)" && \ 74 exit 1 || true ;\ 75 \ 76 cd $(dir ${DT_BIN}) && \ 77 $(OBJCOPY) -I binary -O $${oformat} -B $${oarch} \ 78 $(notdir ${DT_BIN}) $@ 79 rm $(DT_BIN) 80 81OBJS-$(CONFIG_OF_EMBED) := dt.o 82 83COBJS := $(OBJS-y) 84 85OBJS := $(addprefix $(obj),$(COBJS)) 86 87binary: $(DT_BIN) 88 89$(LIB): $(OBJS) $(DTB) 90 $(call cmd_link_o_target, $(OBJS)) 91 92######################################################################### 93 94# defines $(obj).depend target 95include $(SRCTREE)/rules.mk 96 97sinclude $(obj).depend 98 99######################################################################### 100