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uboot主Makefile之9——源码目录下mkconfig解析

时间:2018-01-25 21:49:17      阅读:180      评论:0      收藏:0      [点我收藏+]

标签:源码   span   c11   blog   soc   tomat   obj   变量   ase   

#!/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 <wd@denx.de>
#

APPEND=no # Default: Create new config file
BOARD_NAME="" # Name to print in make output

while [ $# -gt 0 ] ; do

case "$1" in
--) shift ; break ;;
-a) shift ; APPEND=yes ;;
-n) shift ; BOARD_NAME="${1%%_config}" ; shift ;;
*) break ;;
esac
done

在这里case中的break是退出while循环的,shell脚本中的case不需要break。

shift是循环将参数左移,先是移$1, 下次循环$2变为$1,$3变为$2

[ "${BOARD_NAME}" ] || BOARD_NAME="$1"        //这是个简略的if语句,如果||前面的为true则不执行后面的,如果前面的为false,则会执行后面的

                       //上面定义的BOARD_NAME变量为空,所以BOARD_NAME变量就等于$1

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

echo "Configuring for ${BOARD_NAME} board..."    //这句就是我们执行make x210_sd_config之后看到的那句话

 

#
# 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
cd ./include
rm -f asm
ln -s asm-$2 asm    //创建asm链接文件               asm -> asm-arm
fi

 

 

rm -f asm-$2/arch

 

if [ -z "$6" -o "$6" = "NULL" ] ; then
ln -s ${LNPREFIX}arch-$3 asm-$2/arch
else
ln -s ${LNPREFIX}arch-$6 asm-$2/arch
fi

# create link for s5pc11x SoC
if [ "$3" = "s5pc11x" ] ; then
rm -f regs.h
ln -s $6.h regs.h
rm -f asm-$2/arch
ln -s arch-$3 asm-$2/arch
fi

if [ "$2" = "arm" ] ; then
rm -f asm-$2/proc
ln -s ${LNPREFIX}proc-armv asm-$2/proc
fi

#
# Create include file for Make
#
echo "ARCH = $2" > config.mk            //一个>是创建文件并写入
echo "CPU = $3" >> config.mk            //两个>>是向其后的文件中追加内容
echo "BOARD = $4" >> config.mk

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

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

上面这五行就是创建include目录下的那个config.mk文件的,就是在主Makefile的133行包含的那个文件include $(obj)include/config.mk

并将这五个变量导出为环境变量export  ARCH CPU BOARD VENDOR SOC

#
# Create board specific header file
#
if [ "$APPEND" = "yes" ] # Append to existing config file
then
echo >> config.h
else                    //最上面的APPEND变量等于no,故走else分支
> config.h # Create new config file        //在include目录下新建一个config.h
fi
echo "/* Automatically generated - do not edit */" >>config.h  //因为该文件是自动生成的,所以不要在里面编辑
echo "#include <configs/$1.h>" >>config.h     //并将这两句话输入到include/config.h文件中

exit 0

 

uboot主Makefile之9——源码目录下mkconfig解析

标签:源码   span   c11   blog   soc   tomat   obj   变量   ase   

原文地址:https://www.cnblogs.com/AndyChen1/p/8353056.html

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