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 24# We preprocess the device tree file provide a useful define 25DTS_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 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 rc=$$( \ 39 cat $< | $(CPP) -P $(DTS_CPPFLAGS) - | \ 40 { { $(DTC) -R 4 -p 0x1000 -O dtb -o ${DT_BIN} - 2>&1 ; \ 41 echo $$? >&3 ; } | \ 42 grep -v '^DTC: dts->dtb on file' ; \ 43 } 3>&1 1>&2 ) ; \ 44 exit $$rc 45 46process_lds = \ 47 $(1) | sed -r -n 's/^OUTPUT_$(2)[ ("]*([^")]*).*/\1/p' 48 49# Run the compiler and get the link script from the linker 50GET_LDS = $(CC) $(CFLAGS) $(LDFLAGS) -Wl,--verbose 2>&1 51 52$(obj)dt.o: $(DT_BIN) 53 # We want the output format and arch. 54 # We also hope to win a prize for ugliest Makefile / shell interaction 55 # We look in the LDSCRIPT first. 56 # Then try the linker which should give us the answer. 57 # Then check it worked. 58 [ -n "$(LDSCRIPT)" ] && \ 59 oformat=`$(call process_lds,cat $(LDSCRIPT),FORMAT)` && \ 60 oarch=`$(call process_lds,cat $(LDSCRIPT),ARCH)` ;\ 61 \ 62 [ -z $${oformat} ] && \ 63 oformat=`$(call process_lds,$(GET_LDS),FORMAT)` ;\ 64 [ -z $${oarch} ] && \ 65 oarch=`$(call process_lds,$(GET_LDS),ARCH)` ;\ 66 \ 67 [ -z $${oformat} ] && \ 68 echo "Cannot read OUTPUT_FORMAT from lds file $(LDSCRIPT)" && \ 69 exit 1 || true ;\ 70 [ -z $${oarch} ] && \ 71 echo "Cannot read OUTPUT_ARCH from lds file $(LDSCRIPT)" && \ 72 exit 1 || true ;\ 73 \ 74 cd $(dir ${DT_BIN}) && \ 75 $(OBJCOPY) -I binary -O $${oformat} -B $${oarch} \ 76 $(notdir ${DT_BIN}) $@ 77 rm $(DT_BIN) 78 79OBJS-$(CONFIG_OF_EMBED) := dt.o 80 81COBJS := $(OBJS-y) 82 83OBJS := $(addprefix $(obj),$(COBJS)) 84 85binary: $(DT_BIN) 86 87$(LIB): $(OBJS) $(DTB) 88 $(call cmd_link_o_target, $(OBJS)) 89 90######################################################################### 91 92# defines $(obj).depend target 93include $(SRCTREE)/rules.mk 94 95sinclude $(obj).depend 96 97######################################################################### 98