#!/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 <[email protected]>
#

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

在這裏case中的break是退出while循環的，shell腳本中的case不需要break。

shift是循環將參數左移，先是移$1, 下次循環$2變為$1,$3變為$2

[ "${BOARD_NAME}" ] || BOARD_NAME="$1" //這是個簡略的if語句，如果||前面的為true則不執行後面的，如果前面的為false，則會執行後面的

　　　　　　　　　　　　　　　　　　　　　　 //上面定義的BOARD_NAME變量為空，所以BOARD_NAME變量就等於$1

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

echo "Configuring for ${BOARD_NAME} board..."　　　　//這句就是我們執行make x210_sd_config之後看到的那句話

#
# 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

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　　　　　　　　　　　　//一個>是創建文件並寫入
echo "CPU = $3" >> config.mk　　　　　　　　　　　　//兩個>>是向其後的文件中追加內容
echo "BOARD = $4" >> config.mk

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

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

上面這五行就是創建include目錄下的那個config.mk文件的，就是在主Makefile的133行包含的那個文件include $(obj)include/config.mk

並將這五個變量導出為環境變量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變量等於no,故走else分支
> config.h # Create new config file　　　　　　 //在include目錄下新建一個config.h
fi
echo "/* Automatically generated - do not edit */" >>config.h //因為該文件是自動生成的,所以不要在裏面編輯
echo "#include <configs/$1.h>" >>config.h　　 //並將這兩句話輸入到include/config.h文件中

exit 0

uboot主Makefile之9——源碼目錄下mkconfig解析