uboot2013-10移植（二）--mkconfig注释

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转载地址：http://blog.csdn.net/fjlhlonng/article/details/22043703

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#!/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) 2002-2013 DENX Software Engineering, Wolfgang Denk <wd@denx.de>
#
# SPDX-License-Identifier: GPL-2.0+
#
APPEND=no # Default: Create new config file
BOARD_NAME="" # Name to print in make output
TARGETS=""
arch=""
cpu=""
board=""
vendor=""
soc=""
options=""
if [ $# -eq 2 -a $ "$1" = "-A" $ ] ; then
# Automatic mode
# !~表示不匹配，~表示匹配，awk对外部变量的引用是先用双引号包含，然后在是用单引号，所以前面的$2表示的是smdkc100
line=`awk '($0 !~ /^#/ && $7 ~ /^'"$2"'$/) { print $1, $2, $3, $4, $5, $6, $7, $8 }' boards.cfg`
if [ -z "$line" ] ; then
echo "make: *** No rule to make target \`$2_config'. Stop." >&2
exit 1
fi
set ${line}
# add default board name if needed
[ $# = 3 ] && set ${line} ${1}
fi
# 不存在这些参数
while [ $# -gt 0 ] ; do
case "$1" in
--) shift ; break ;;
-a) shift ; APPEND=yes ;;
-n) shift ; BOARD_NAME="${7%_config}" ; shift ;;
-t) shift ; TARGETS="`echo $1 | sed 's:_: :g'` ${TARGETS}" ; shift ;;
*) break ;;
esac
done
# 参数个数小于7或者大于8个则退出脚本
[ $# -lt 7 ] && exit 1
[ $# -gt 8 ] && exit 1
# Strip all options and/or _config suffixes
CONFIG_NAME="${7%_config}" # CONFIG_NAME=smdkc100_config
# 如果没有设置BOARD_NAME这个变量，那么将它赋值为smdkc100_config
[ "${BOARD_NAME}" ] || BOARD_NAME="${7%_config}"
arch="$2" # ARCH=arm
cpu=`echo $3 | awk 'BEGIN {FS = ":"} ; {print $1}'` # cpu=armv7
spl_cpu=`echo $3 | awk 'BEGIN {FS = ":"} ; {print $2}'` # spl_cpu=armv7
if [ "$6" = "-" ] ; then
board=${BOARD_NAME}
else
board="$6" # board=smdkc100
fi
[ "$5" != "-" ] && vendor="$5" # vendor=samsung
[ "$4" != "-" ] && soc="$4" #soc=s5pc1xx
[ $# -gt 7 ] && [ "$8" != "-" ] && {
# check if we have a board config name in the options field
# the options field mave have a board config name and a list
# of options, both separated by a colon (':'); the options are
# separated by commas (',').
#
# Check for board name
# 这里不会执行，下面这条命令的意思是删除$8字串中包括冒号以后的所有字符
tmp="${8%:*}"
if [ "$tmp" ] ; then
CONFIG_NAME="$tmp"
fi
# Check if we only have a colon...
if [ "${tmp}" != "$8" ] ; then
# 删除$8中包括冒号以前的所有字符
options=${8#*:}
TARGETS="`echo ${options} | sed 's:,: :g'` ${TARGETS}"
fi
}
if [ "${ARCH}" -a "${ARCH}" != "${arch}" ]; then
echo "Failed: \$ARCH=${ARCH}, should be '${arch}' for ${BOARD_NAME}" 1>&2
exit 1
fi
# 没有options变量
if [ "$options" ] ; then
echo "Configuring for ${BOARD_NAME} - Board: ${CONFIG_NAME}, Options: ${options}"
else
echo "Configuring for ${BOARD_NAME} board..."
fi
#
# Create link to architecture specific headers
# 相等，所以执行else
if [ "$SRCTREE" != "$OBJTREE" ] ; then
mkdir -p ${OBJTREE}/include
mkdir -p ${OBJTREE}/include2
cd ${OBJTREE}/include2
rm -f asm
ln -s ${SRCTREE}/arch/${arch}/include/asm asm
LNPREFIX=${SRCTREE}/arch/${arch}/include/asm/
cd ../include
mkdir -p asm
else
cd ./include
rm -f asm
ln -s ../arch/${arch}/include/asm asm
fi
rm -f asm/arch
if [ -z "${soc}" ] ; then
ln -s ${LNPREFIX}arch-${cpu} asm/arch
else
ln -s ${LNPREFIX}arch-${soc} asm/arch # 执行这里
fi
if [ "${arch}" = "arm" ] ; then
rm -f asm/proc
ln -s ${LNPREFIX}proc-armv asm/proc
fi
#
# Create include file for Make
#
( echo "ARCH = ${arch}"
if [ ! -z "$spl_cpu" ] ; then
echo 'ifeq ($(CONFIG_SPL_BUILD),y)'
echo "CPU = ${spl_cpu}"
echo "else"
echo "CPU = ${cpu}"
echo "endif"
else
echo "CPU = ${cpu}" # 执行这里
fi
echo "BOARD = ${board}"
[ "${vendor}" ] && echo "VENDOR = ${vendor}"
[ "${soc}" ] && echo "SOC = ${soc}"
exit 0 ) > config.mk # 把上述变量都创建到这个文件中
# Assign board directory to BOARDIR variable
if [ -z "${vendor}" ] ; then
BOARDDIR=${board}
else
BOARDDIR=${vendor}/${board} # 执行这里，赋值为samsung/smdkc100
fi
#
# Create board specific header file
#
if [ "$APPEND" = "yes" ] # Append to existing config file
then
echo >> config.h
else
> config.h # Create new config file, 我们创建新文件
fi
echo "/* Automatically generated - do not edit */" >>config.h
# 没有设置TARGETS
for i in ${TARGETS} ; do
i="`echo ${i} | sed '/=/ {s/=/ /;q; } ; { s/$/ 1/; }'`"
echo "#define CONFIG_${i}" >>config.h ;
done
# 从这里开始为config.h输入内容
echo "#define CONFIG_SYS_ARCH \"${arch}\"" >> config.h
echo "#define CONFIG_SYS_CPU \"${cpu}\"" >> config.h
echo "#define CONFIG_SYS_BOARD \"${board}\"" >> config.h
[ "${vendor}" ] && echo "#define CONFIG_SYS_VENDOR \"${vendor}\"" >> config.h
[ "${soc}" ] && echo "#define CONFIG_SYS_SOC \"${soc}\"" >> config.h
cat << EOF >> config.h
#define CONFIG_BOARDDIR board/$BOARDDIR
#include <config_cmd_defaults.h>
#include <config_defaults.h>
#include <configs/${CONFIG_NAME}.h>
#include <asm/config.h>
#include <config_fallbacks.h>
#include <config_uncmd_spl.h>
EOF
exit 0

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