u-boot mkconfig文件分析

Mkconfig文件分析

 

 

 

#!/bin/sh-e

 

#Scripttocreateheaderfilesandlinkstoconfigure

#U-Bootforaspecificboard.

#

#Parameters:TargetArchitectureCPUBoard[VENDOR][SOC]

#@$(MKCONFIG)mini6410armarm1176mini6410samsungs3c64xx

#(C)2002-2006DENXSoftwareEngineering,WolfgangDenk<[e-mail]>

#

 

#***定义变量

APPEND=no #Default:Createnewconfigfile

BOARD_NAME="" #Nametoprintinmakeoutput

TARGETS=""

arch=""

cpu=""

board=""

vendor=""

soc=""

 

#***make-Axxx$#为2，且$1为-A时条件成立

if[\($#-eq2\)-a\("$1"="-A"\)];then

#Automaticmode

#***搜索boards.cfg文件,把包含有xxx的行，赋值给line变量

#假如为：mini6410armarm1176mini6410samsungs3c64xx

line=`egrep-i"^[[:space:]]*${2}[[:space:]]"boards.cfg`||{

echo"make:***Noruletomaketarget\`$2_config'.Stop.">&2

exit1

}

#***把line的内容分别赋值给$1--$6

set${line}

#adddefaultboardnameifneeded

[$#=3]&&set${line}${1}

fi

 

while[$#-gt0];do

case"$1"in

--)shift;break;;

-a)shift;APPEND=yes;;

-n)shift;BOARD_NAME="${1%_config}";shift;;

-t)shift;TARGETS="`echo$1|sed's:_::g'`${TARGETS}";shift;;

*)break;;

esac

done

 

#***$#表示参数个数,如果参数个数小于4个大于6个就退出

[$#-lt4]&&exit1

[$#-gt6]&&exit1

 

#***此处的$1如上面代码所表示,如果$1是以_config结尾，则去掉_config

CONFIG_NAME="${1%_config}"

#***如果BOARD_NAME没有定义就执行BOARD_NAME="${CONFIG_NAME}"#=mini6410

["${BOARD_NAME}"]||BOARD_NAME="${CONFIG_NAME}"

#***arch=arm

arch="$2"

#***cpu=arm1176

cpu="$3"

if["$4"="-"];then

board=${BOARD_NAME}

else

#board=mini6410

board="$4"

fi

//同上给vendor和soc赋值

[$#-gt4]&&["$5"!="-"]&&vendor="$5"

[$#-gt5]&&["$6"!="-"]&&soc="$6"

 

#***检察ARCH是否定义，是否等于arch

if["${ARCH}"-a"${ARCH}"!="${arch}"];then

#***输出错误信息

echo"Failed:\$ARCH=${ARCH},shouldbe'${arch}'for${BOARD_NAME}"1>&2

exit1

fi

 

echo"Configuringfor${BOARD_NAME}board..."

 

#

#Createlinktoarchitecturespecificheaders

#

#***检查SRCTREE和OBJTREE是否都是指向u-boot-xxxx.xx

if["$SRCTREE"!="$OBJTREE"];then

#***

mkdir-p${OBJTREE}/include

mkdir-p${OBJTREE}/include2

cd${OBJTREE}/include2

rm-fasm

ln-s${SRCTREE}/arch/${arch}/include/asmasm

LNPREFIX=${SRCTREE}/arch/${arch}/include/asm/

cd../include

rm-fasm

ln-s${SRCTREE}/arch/${arch}/include/asmasm

else

cd./include

rm-fasm#***删除上次链接文件

#***重新建立链接文件

ln-s../arch/${arch}/include/asmasm

fi

#***删除/include/asm/arch文件

rm-fasm/arch

 

#***建立链接/include/asm/arch到arch-arm1176

if[-z"${soc}"];then

ln-s${LNPREFIX}arch-${cpu}asm/arch

else

ln-s${LNPREFIX}arch-${soc}asm/arch

fi

 

#***建立链接asm/proc到proc-armv

if["${arch}"="arm"];then

rm-fasm/proc

ln-s${LNPREFIX}proc-armvasm/proc

fi

 

#

#CreateincludefileforMake

#

echo"ARCH=${arch}">config.mk

echo"CPU=${cpu}">>config.mk

echo"BOARD=${board}">>config.mk

 

["${vendor}"]&&echo"VENDOR=${vendor}">>config.mk

 

["${soc}"]&&echo"SOC=${soc}">>config.mk

 

#AssignboarddirectorytoBOARDIRvariable

if[-z"${vendor}"];then

BOARDDIR=${board}

else

 

#***BOARDDIR=samsung/s3c64xx

BOARDDIR=${vendor}/${board}

fi

 

#

#Createboardspecificheaderfile

#

#***创建空白文档config.h

if["$APPEND"="yes"] #Appendtoexistingconfigfile

then

echo>>config.h

else

>config.h #Createnewconfigfile

fi

echo"/*Automaticallygenerated-donotedit*/">>config.h

 

foriin${TARGETS};do

echo"#defineCONFIG_MK_${i}1">>config.h;

done

 

#***config.h文件中写入以下内容

cat<<EOF>>config.h

#defineCONFIG_BOARDDIRboard/$BOARDDIR

#include<config_defaults.h>

#include<configs/${CONFIG_NAME}.h>

#include<asm/config.h>

EOF

 

exit0

 

注：mkconfig文件创建两个文件config.h和config.mk

建立两个链接文件arch-arm1176和proc-armv