uboot_2009.08之mkconfig分析

 

   前面编译过程中提到编译uboot_2009.08过程中第一步就是配置执行：make NAME_config命令，向脚本文件mkconfig传递6个参数

                               smdk2440   arm arm920t smdk2440 samsung s3c24x0

下面贴出了整个文件，加注释

#!/bin/sh -e

# Script to create header files and links to configure
# U-Boot for a specific board.
#
# Parameters:  Target  Architecture  CPU  Board [VENDOR] [SOC]
#
# (C) 2002-2006 DENX Software Engineering, Wolfgang Denk <[e-mail]>
#

APPEND=no # Default: Create new config file
BOARD_NAME="" # Name to print in make output  #开发板名字赋值为空，你要自己在这定义当然也可以

while [ $# -gt 0 ] ; do
 case "$1" in
 --) shift ; break ;;
 -a) shift ; APPEND=yes ;;
 -n) shift ; BOARD_NAME="${1%%_config}" ; shift ;;
 *)  break ;;
 esac
done

#检测传递的参数中是否有-- -a -n  ，六个参数中没有

[ "${BOARD_NAME}" ] || BOARD_NAME="$1"#如果BOARD_NAME为空，BOARD_NAME="$1"=smdk2440   ；

[ $# -lt 4 ] && exit 1
[ $# -gt 6 ] && exit 1

#检测参数个数是否小于4，大于6，如果不在范围之内，退出程序

echo "Configuring for ${BOARD_NAME} board..."#显示Configuring for ${BOARD_NAME} board...",可以make NAME_config验证下；

#
# Create link to architecture specific headers
#
if [ "$SRCTREE" != "$OBJTREE" ] ; then
 mkdir -p ${OBJTREE}/include
 mkdir -p ${OBJTREE}/include2
 cd ${OBJTREE}/include2
 rm -f asm
 ln -s ${SRCTREE}/include/asm-$2 asm
 LNPREFIX="../../include2/asm/"
 cd ../include
 rm -rf asm-$2
 rm -f asm
 mkdir asm-$2
 ln -s asm-$2 asm
else#上面条件不成立执行下面分支
 cd ./include
 rm -f asm
 ln -s asm-$2 asm

fi

#在include目录下建立软链接 asm->asm-arm,到include目录下看看是不是存在这样的一个文件

rm -f asm-$2/arch

if [ -z "$6" -o "$6" = "NULL" ] ; then
 ln -s ${LNPREFIX}arch-$3 asm-$2/arch
else#上面同样不成立，执行分支
 ln -s ${LNPREFIX}arch-$6 asm-$2/arch
fi

还是建立软链接asm-arm/arch->arch-s3c24x0

if [ "$2" = "arm" ] ; then
 rm -f asm-$2/proc
 ln -s ${LNPREFIX}proc-armv asm-$2/proc
fi#成立建立链接

#
# Create include file for Make
#
echo "ARCH   = $2" >  config.mk
echo "CPU    = $3" >> config.mk
echo "BOARD  = $4" >> config.mk

[ "$5" ] && [ "$5" != "NULL" ] && echo "VENDOR = $5" >> config.mk

[ "$6" ] && [ "$6" != "NULL" ] && echo "SOC    = $6" >> config.mk

#在config.mk文件中写入

                                    ARCH=arm

                                    CPU=arm920t

                                    BOARD=smdk2440

                                    VENDOR= samsung   

                                    SOC  =s3c24x0;

#
# Create board specific header file
#
if [ "$APPEND" = "yes" ] # Append to existing config file
then echo >> config.h
else#上面不成立执行分支

 > config.h  # Create new config file
fi
echo "/* Automatically generated - do not edit */" >>config.h
echo "#include <configs/$1.h>" >>config.h
echo "#include <asm/config.h>" >>config.h

#向创建文件config.h写入

 /*Automatically generated - do not edit */
 #include <configs/smdk2440.h>" >>config.h

#include <asm/config.h>" >>config.h

exit 0#退出

总结：mkconfig文件主要做的事情校验参数，然后根据参数建立链接，再创建两个文件config.mk,config.h