下面是一个执行make XXX_config后的打印信息：

pengdl@debian:~/work/costdown/new/Hi3520D_SDK_V1.0.2.2c/source/arm11/u-boot-2010.06$ make ARCH=arm CROSS_COMPILE=arm-hisiv100nptl-linux- hi3520d_configGenerating include/autoconf.mkGenerating include/autoconf.mk.dep# Target  Architecture  CPU  Board [VENDOR] [SOC]'$#' = 6'$0' = /home/pengdl/work/costdown/new/Hi3520D_SDK_V1.0.2.2c/source/arm11/u-boot-2010.06/mkconfig'$1' = hi3520d (Target)'$2' = arm (Architecture)'$3' = hi3520d (CPU)'$4' = hi3520d (Board)'$5' = NULL (VENDOR)'$6' = hi3520d (SOC)BOARD_NAME = hi3520d/home/pengdl/work/costdown/new/Hi3520D_SDK_V1.0.2.2c/source/arm11/u-boot-2010.06Configuring for hi3520d board...SRCTREE = /home/pengdl/work/costdown/new/Hi3520D_SDK_V1.0.2.2c/source/arm11/u-boot-2010.06OBJTREE = /home/pengdl/work/costdown/new/Hi3520D_SDK_V1.0.2.2c/source/arm11/u-boot-2010.06ln -s ../arch/arm/include/asm asm/home/pengdl/work/costdown/new/Hi3520D_SDK_V1.0.2.2c/source/arm11/u-boot-2010.06/includeln -s arch-hi3520d asm/archln -s proc-armv asm/procARCH   = arm >  config.mkCPU    = hi3520d >>  config.mkBOARD  = hi3520d >>  config.mkSOC    = hi3520d >> config.mkBOARDDIR = hi3520d/home/pengdl/work/costdown/new/Hi3520D_SDK_V1.0.2.2c/source/arm11/u-boot-2010.06/include

下面是mkconfig的代码：

#!/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 
     
      #APPEND=no    # Default: Create new config fileBOARD_NAME=""    # Name to print in make outputTARGETS=""while [ $# -gt 0 ] ; 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 ;;    esacdoneecho "# Target  Architecture  CPU  Board [VENDOR] [SOC]"echo "'\$#' = $#"echo "'\$0' = $0" echo "'\$1' = $1 (Target)" echo "'\$2' = $2 (Architecture)"echo "'\$3' = $3 (CPU)"echo "'\$4' = $4 (Board)"echo "'\$5' = $5 (VENDOR)"echo "'\$6' = $6 (SOC)"[ "${BOARD_NAME}" ] || BOARD_NAME="$1"[ $# -lt 4 ] && exit 1[ $# -gt 6 ] && exit 1if [ "${ARCH}" -a "${ARCH}" != "$2" ]; then    echo "Failed: \$ARCH=${ARCH}, should be '$2' for ${BOARD_NAME}" 1>&2    exit 1fiecho "BOARD_NAME = $BOARD_NAME"echo "`pwd`"echo "Configuring for ${BOARD_NAME} board..."## Create link to architecture specific headers#echo "SRCTREE = $SRCTREE"echo "OBJTREE = $OBJTREE"if [ "$SRCTREE" != "$OBJTREE" ] ; then    mkdir -p ${OBJTREE}/include    mkdir -p ${OBJTREE}/include2    cd ${OBJTREE}/include2    rm -f asm    ln -s ${SRCTREE}/arch/$2/include/asm asm    LNPREFIX=${SRCTREE}/arch/$2/include/asm/    cd ../include    rm -f asm    ln -s ${SRCTREE}/arch/$2/include/asm asmelse    cd ./include    rm -f asm    echo  "ln -s ../arch/$2/include/asm asm"    ln -s ../arch/$2/include/asm asmfiecho "`pwd`"rm -f asm/archif [ -z "$6" -o "$6" = "NULL" ] ; then    echo "ln -s ${LNPREFIX}arch-$3 asm/arch"    ln -s ${LNPREFIX}arch-$3 asm/archelse    echo "ln -s ${LNPREFIX}arch-$6 asm/arch"    ln -s ${LNPREFIX}arch-$6 asm/archfiif [ "$2" = "arm" ] ; then    rm -f asm/proc    echo "ln -s ${LNPREFIX}proc-armv asm/proc"    ln -s ${LNPREFIX}proc-armv asm/procfi## Create include file for Make#echo "ARCH   = $2 >  config.mk"echo "ARCH   = $2" >  config.mkecho "CPU    = $3 >>  config.mk"echo "CPU    = $3" >> config.mkecho "BOARD  = $4 >>  config.mk"echo "BOARD  = $4" >> config.mk[ "$5" ] && [ "$5" != "NULL" ] && echo "VENDOR = $5" >> config.mk  && echo "VENDOR = $5 >> config.mk"[ "$6" ] && [ "$6" != "NULL" ] && echo "SOC    = $6" >> config.mk  && echo "SOC    = $6 >> config.mk"# Assign board directory to BOARDIR variableif [ -z "$5" -o "$5" = "NULL" ] ; then    BOARDDIR=$4else    BOARDDIR=$5/$4fiecho "BOARDDIR = $BOARDDIR"## Create board specific header file#echo "`pwd`"if [ "$APPEND" = "yes" ]    # Append to existing config filethen    echo >> config.helse    > config.h        # Create new config filefiecho "/* Automatically generated - do not edit */" >>config.hfor i in ${TARGETS} ; do    echo "#define CONFIG_MK_${i} 1" >>config.h ;donecat << EOF >> config.h#define CONFIG_BOARDDIR board/$BOARDDIR#include 
      
       #include 
       
        #include 
        
         EOFexit 0
        
       
      
     

 

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• 如何知道自己的板子用的是哪个串口驱动？

在include/configs/Target.h（Target 是传给mkconfig的第一个参数，即$1）中定义了大量的宏，在其中搜索serial，可以找到相关的宏，然后到driver/serial/Makefile中看调用的是哪个C文件，或者直接看driver/serial/下有哪个C文件参见了编译即可。