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 20DTS_INCDIRS = $(SRCTREE)/board/$(VENDOR)/$(BOARD)/dts 21DTS_INCDIRS += $(SRCTREE)/board/$(VENDOR)/dts 22DTS_INCDIRS += $(SRCTREE)/arch/$(ARCH)/dts 23 24DTS_CPPFLAGS := -x assembler-with-cpp -undef -D__DTS__ \ 25 -nostdinc $(addprefix -I,$(DTS_INCDIRS)) 26 27DTC_FLAGS := -R 4 -p 0x1000 \ 28 $(addprefix -i ,$(DTS_INCDIRS)) 29 30all: $(obj).depend $(LIB) 31 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 34# the filename. 35DT_BIN := $(obj)dt.dtb 36 37$(DT_BIN): $(TOPDIR)/board/$(VENDOR)/dts/$(DEVICE_TREE).dts 38 $(CPP) $(DTS_CPPFLAGS) $< -o $(DT_BIN).dts.tmp 39 $(DTC) $(DTC_FLAGS) -O dtb -o ${DT_BIN} $(DT_BIN).dts.tmp 40 41process_lds = \ 42 $(1) | sed -r -n 's/^OUTPUT_$(2)[ ("]*([^")]*).*/\1/p' 43 44# Run the compiler and get the link script from the linker 45GET_LDS = $(CC) $(CFLAGS) $(LDFLAGS) -Wl,--verbose 2>&1 46 47$(obj)dt.o: $(DT_BIN) 48 # We want the output format and arch. 49 # We also hope to win a prize for ugliest Makefile / shell interaction 50 # We look in the LDSCRIPT first. 51 # Then try the linker which should give us the answer. 52 # Then check it worked. 53 [ -n "$(LDSCRIPT)" ] && \ 54 oformat=`$(call process_lds,cat $(LDSCRIPT),FORMAT)` && \ 55 oarch=`$(call process_lds,cat $(LDSCRIPT),ARCH)` ;\ 56 \ 57 [ -z $${oformat} ] && \ 58 oformat=`$(call process_lds,$(GET_LDS),FORMAT)` ;\ 59 [ -z $${oarch} ] && \ 60 oarch=`$(call process_lds,$(GET_LDS),ARCH)` ;\ 61 \ 62 [ -z $${oformat} ] && \ 63 echo "Cannot read OUTPUT_FORMAT from lds file $(LDSCRIPT)" && \ 64 exit 1 || true ;\ 65 [ -z $${oarch} ] && \ 66 echo "Cannot read OUTPUT_ARCH from lds file $(LDSCRIPT)" && \ 67 exit 1 || true ;\ 68 \ 69 cd $(dir ${DT_BIN}) && \ 70 $(OBJCOPY) -I binary -O $${oformat} -B $${oarch} \ 71 $(notdir ${DT_BIN}) $@ 72 rm $(DT_BIN) 73 74OBJS-$(CONFIG_OF_EMBED) := dt.o 75 76COBJS := $(OBJS-y) 77 78OBJS := $(addprefix $(obj),$(COBJS)) 79 80binary: $(DT_BIN) 81 82$(LIB): $(OBJS) $(DTB) 83 $(call cmd_link_o_target, $(OBJS)) 84 85######################################################################### 86 87# defines $(obj).depend target 88include $(SRCTREE)/rules.mk 89 90sinclude $(obj).depend 91 92######################################################################### 93