# (C) Copyright（版权） 2000-2006
# Wolfgang Denk（人名）, DENX Software Engineering（denx软件工程师）, wd@denx.de.（邮箱）
# See file CREDITS for list of people who contributed to thisproject.
#在文件中查看对项目有贡献的人人的名单
# This program is free software; you can redistribute(重新分配) it and/or modify（修改） it under the terms （条款）of the GNU General（通用的） Public License （许可）as published（已出版的） by the Free Software Foundatio（基金会）;
either version（版本） 2 of the License, or (at your option) any later version. #
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY（保证）; without even the implied（暗示、默认） warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. （merchantability（商业性的） or fitness for a particular（特别） poupose） See the GNU General Public License for more details. #
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software Foundation（自由软件基金会）, Inc., 59 Temple Place, Suite 330, Boston, # MA 02111-1307 USA #
//上面的是版本信息
VERSION = 1 PATCHLEVEL = 1 SUBLEVEL = 6 EXTRAVERSION =
U_BOOT_VERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION) // VERSION_FILE = $(obj)include/version_autogenerated.h
HOSTARCH := $(shell uname -m | \\ sed -e s/i.86/i386/ \\ -e s/sun4u/sparc64/ \\ -e s/arm.*/arm/ \\ -e s/sa110/arm/ \\ -e s/powerpc/ppc/ \\ -e s/macppc/ppc/)
HOSTOS := $(shell uname -s | tr '[:upper:]' '[:lower:]' | \\ sed -e 's/\\(cygwin\\).*/cygwin/')
export HOSTARCH HOSTOS
# Deal with colliding definitions from tcsh etc. VENDOR=
######################################################################### #
# U-boot build supports producing a object files to the separate external # directory. Two use cases are supported: #
# 1) Add O= to the make command line # 'make O=/tmp/build all' #
# 2) Set environement variable BUILD_DIR to point to the desired location # 'export BUILD_DIR=/tmp/build' # 'make' #
# The second approach can also be used with a MAKEALL script # 'export BUILD_DIR=/tmp/build' # './MAKEALL' #
# Command line 'O=' setting overrides BUILD_DIR environent variable. #
# When none of the above methods is used the local build is performed and # the object files are placed in the source directory. #
ifdef O
ifeq (\BUILD_DIR := $(O) endif endif
ifneq ($(BUILD_DIR),)
saved-output := $(BUILD_DIR)
# Attempt to create a output directory.
$(shell [ -d ${BUILD_DIR} ] || mkdir -p ${BUILD_DIR})
# Verify if it was successful.
BUILD_DIR := $(shell cd $(BUILD_DIR) && /bin/pwd)
$(if $(BUILD_DIR),,$(error output directory \endif # ifneq ($(BUILD_DIR),)
OBJTREE := $(if $(BUILD_DIR),$(BUILD_DIR),$(CURDIR)) SRCTREE := $(CURDIR) TOPDIR := $(SRCTREE) LNDIR := $(OBJTREE)
export TOPDIR SRCTREE OBJTREE
MKCONFIG := $(SRCTREE)/mkconfig export MKCONFIG
ifneq ($(OBJTREE),$(SRCTREE)) REMOTE_BUILD := 1 export REMOTE_BUILD endif
# $(obj) and (src) are defined in config.mk but here in main Makefile # we also need them before config.mk is included which is the case for # some targets like unconfig, clean, clobber, distclean, etc. ifneq ($(OBJTREE),$(SRCTREE)) obj := $(OBJTREE)/ src := $(SRCTREE)/ else obj := src := endif
export obj src
#########################################################################
ifeq ($(OBJTREE)/include/config.mk,$(wildcard $(OBJTREE)/include/config.mk))
# load ARCH, BOARD, and CPU configuration include $(OBJTREE)/include/config.mk export ARCH CPU BOARD VENDOR SOC
ifndef CROSS_COMPILE ifeq ($(HOSTARCH),ppc) CROSS_COMPILE = else
ifeq ($(ARCH),ppc)
CROSS_COMPILE = powerpc-linux- endif
ifeq ($(ARCH),arm)
CROSS_COMPILE = arm-linux- endif
ifeq ($(ARCH),i386)
ifeq ($(HOSTARCH),i386) CROSS_COMPILE = else