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 = $(obj)libdts.o 29 30$(if $(CONFIG_DEFAULT_DEVICE_TREE),,\ 31$(error Please define CONFIG_DEFAULT_DEVICE_TREE in your board header file)) 32DEVICE_TREE = $(subst ",,$(CONFIG_DEFAULT_DEVICE_TREE)) 33 34$(if $(CONFIG_ARCH_DEVICE_TREE),,\ 35$(error Your architecture does not have device tree support enabled. \ 36Please define CONFIG_ARCH_DEVICE_TREE)) 37 38# We preprocess the device tree file provide a useful define 39DTS_CPPFLAGS := -DARCH_CPU_DTS=\"$(SRCTREE)/arch/$(ARCH)/dts/$(CONFIG_ARCH_DEVICE_TREE).dtsi\" 40 41all: $(obj).depend $(LIB) 42 43# Use a constant name for this so we can access it from C code. 44# objcopy doesn't seem to allow us to set the symbol name independently of 45# the filename. 46DT_BIN := $(obj)dt.dtb 47 48$(DT_BIN): $(TOPDIR)/board/$(VENDOR)/dts/$(DEVICE_TREE).dts 49 rc=$$( \ 50 cat $< | $(CPP) -P $(DTS_CPPFLAGS) - | \ 51 { { $(DTC) -R 4 -p 0x1000 -O dtb -o ${DT_BIN} - 2>&1 ; \ 52 echo $$? >&3 ; } | \ 53 grep -v '^DTC: dts->dtb on file' ; \ 54 } 3>&1 ) ; \ 55 exit $$rc 56 57process_lds = \ 58 $(1) | sed -r -n 's/^OUTPUT_$(2)[ ("]*([^")]*).*/\1/p' 59 60# Run the compiler and get the link script from the linker 61GET_LDS = $(CC) $(CFLAGS) $(LDFLAGS) -Wl,--verbose 2>&1 62 63$(obj)dt.o: $(DT_BIN) 64 # We want the output format and arch. 65 # We also hope to win a prize for ugliest Makefile / shell interaction 66 # We look in the LDSCRIPT first. 67 # Then try the linker which should give us the answer. 68 # Then check it worked. 69 oformat=`$(call process_lds,cat $(LDSCRIPT),FORMAT)` ;\ 70 oarch=`$(call process_lds,cat $(LDSCRIPT),ARCH)` ;\ 71 \ 72 [ -z $${oformat} ] && \ 73 oformat=`$(call process_lds,$(GET_LDS),FORMAT)` ;\ 74 [ -z $${oarch} ] && \ 75 oarch=`$(call process_lds,$(GET_LDS),ARCH)` ;\ 76 \ 77 [ -z $${oformat} ] && \ 78 echo "Cannot read OUTPUT_FORMAT from lds file $(LDSCRIPT)" && \ 79 exit 1 || true ;\ 80 [ -z $${oarch} ] && \ 81 echo "Cannot read OUTPUT_ARCH from lds file $(LDSCRIPT)" && \ 82 exit 1 || true ;\ 83 \ 84 cd $(dir ${DT_BIN}) && \ 85 $(OBJCOPY) -I binary -O $${oformat} -B $${oarch} \ 86 $(notdir ${DT_BIN}) $@ 87 rm $(DT_BIN) 88 89OBJS-$(CONFIG_OF_EMBED) := dt.o 90 91COBJS := $(OBJS-y) 92 93OBJS := $(addprefix $(obj),$(COBJS)) 94 95binary: $(DT_BIN) 96 97$(LIB): $(OBJS) $(DTB) 98 $(call cmd_link_o_target, $(OBJS)) 99 100######################################################################### 101 102# defines $(obj).depend target 103include $(SRCTREE)/rules.mk 104 105sinclude $(obj).depend 106 107######################################################################### 108