1# 2# Copyright (c) 2011 The Chromium OS Authors. 3# 4# See file CREDITS for list of people who contributed to this 5# project. 6# 7# This program is free software; you can redistribute it and/or 8# modify it under the terms of the GNU General Public License as 9# published by the Free Software Foundatio; either version 2 of 10# the License, or (at your option) any later version. 11# 12# This program is distributed in the hope that it will be useful, 13# but WITHOUT ANY WARRANTY; without even the implied warranty of 14# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15# GNU General Public License for more details. 16# 17# You should have received a copy of the GNU General Public License 18# along with this program; if not, write to the Free Software 19# Foundation, Inc., 59 Temple Place, Suite 330, Boston, 20# MA 02111-1307 USA 21# 22 23# This Makefile builds the internal U-Boot fdt if CONFIG_OF_CONTROL is 24# enabled. See doc/README.fdt-control for more details. 25 26include $(TOPDIR)/config.mk 27 28LIB = $(obj)libdts.o 29 30ifeq ($(DEVICE_TREE),) 31$(if $(CONFIG_DEFAULT_DEVICE_TREE),,\ 32$(error Please define CONFIG_DEFAULT_DEVICE_TREE in your board header file)) 33DEVICE_TREE = $(subst ",,$(CONFIG_DEFAULT_DEVICE_TREE)) 34endif 35 36$(if $(CONFIG_ARCH_DEVICE_TREE),,\ 37$(error Your architecture does not have device tree support enabled. \ 38Please define CONFIG_ARCH_DEVICE_TREE)) 39 40# We preprocess the device tree file provide a useful define 41DTS_CPPFLAGS := -x assembler-with-cpp \ 42 -DARCH_CPU_DTS=\"$(SRCTREE)/arch/$(ARCH)/dts/$(CONFIG_ARCH_DEVICE_TREE).dtsi\" \ 43 -DBOARD_DTS=\"$(SRCTREE)/board/$(VENDOR)/$(BOARD)/dts/$(DEVICE_TREE).dts\" \ 44 -I$(SRCTREE)/board/$(VENDOR)/dts -I$(SRCTREE)/arch/$(ARCH)/dts 45 46all: $(obj).depend $(LIB) 47 48# Use a constant name for this so we can access it from C code. 49# objcopy doesn't seem to allow us to set the symbol name independently of 50# the filename. 51DT_BIN := $(obj)dt.dtb 52 53$(DT_BIN): $(TOPDIR)/board/$(VENDOR)/dts/$(DEVICE_TREE).dts 54 rc=$$( \ 55 cat $< | $(CPP) -P $(DTS_CPPFLAGS) - | \ 56 { { $(DTC) -R 4 -p 0x1000 -O dtb -o ${DT_BIN} - 2>&1 ; \ 57 echo $$? >&3 ; } | \ 58 grep -v '^DTC: dts->dtb on file' ; \ 59 } 3>&1 1>&2 ) ; \ 60 exit $$rc 61 62process_lds = \ 63 $(1) | sed -r -n 's/^OUTPUT_$(2)[ ("]*([^")]*).*/\1/p' 64 65# Run the compiler and get the link script from the linker 66GET_LDS = $(CC) $(CFLAGS) $(LDFLAGS) -Wl,--verbose 2>&1 67 68$(obj)dt.o: $(DT_BIN) 69 # We want the output format and arch. 70 # We also hope to win a prize for ugliest Makefile / shell interaction 71 # We look in the LDSCRIPT first. 72 # Then try the linker which should give us the answer. 73 # Then check it worked. 74 [ -n "$(LDSCRIPT)" ] && \ 75 oformat=`$(call process_lds,cat $(LDSCRIPT),FORMAT)` && \ 76 oarch=`$(call process_lds,cat $(LDSCRIPT),ARCH)` ;\ 77 \ 78 [ -z $${oformat} ] && \ 79 oformat=`$(call process_lds,$(GET_LDS),FORMAT)` ;\ 80 [ -z $${oarch} ] && \ 81 oarch=`$(call process_lds,$(GET_LDS),ARCH)` ;\ 82 \ 83 [ -z $${oformat} ] && \ 84 echo "Cannot read OUTPUT_FORMAT from lds file $(LDSCRIPT)" && \ 85 exit 1 || true ;\ 86 [ -z $${oarch} ] && \ 87 echo "Cannot read OUTPUT_ARCH from lds file $(LDSCRIPT)" && \ 88 exit 1 || true ;\ 89 \ 90 cd $(dir ${DT_BIN}) && \ 91 $(OBJCOPY) -I binary -O $${oformat} -B $${oarch} \ 92 $(notdir ${DT_BIN}) $@ 93 rm $(DT_BIN) 94 95OBJS-$(CONFIG_OF_EMBED) := dt.o 96 97COBJS := $(OBJS-y) 98 99OBJS := $(addprefix $(obj),$(COBJS)) 100 101binary: $(DT_BIN) 102 103$(LIB): $(OBJS) $(DTB) 104 $(call cmd_link_o_target, $(OBJS)) 105 106######################################################################### 107 108# defines $(obj).depend target 109include $(SRCTREE)/rules.mk 110 111sinclude $(obj).depend 112 113######################################################################### 114