#! /bin/sh

export PATH=$PATH:/opt/ti-sdk-am335x-evm-08.00.00.00/linux-devkit/sysroots/i686-arago-linux/usr/bin/

export ARCH=arm

export CROSS_COMPILE=arm-linux-gnueabihf-

make clean

make am335x_evm_config

make

…

MKCONFIG    := $(srctree)/mkconfig

…

%_config:: outputmakefile           # %通配符，相当于xxx_config:: outputmakefile

@$(MKCONFIG) -A $(@:_config=)       # :_config=，用=符号后的’’（空字符）替换”_config”

                                    # $@目标集，$(@:_config=) 就是am335x_evm

…

am335x_evm_config:: outputmakefile

    @mkconfig -A am335x_evm

#!/bin/sh –e     # set –e 判断每条指令的返回值(#?)是否为0，非0自动退出

# 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       # 参数个数为2且第一个参数是”-A”

    # Automatic mode

    # 在顶层boards.cfg中找到匹配“am335x_evm”的行，存在line变量。

    line=`awk '($0 !~ /^#/ && $7 ~ /^'"$2"'$/) { print $1, $2, $3, $4, $5, $6, $7, $8 }' $srctree/boards.cfg`

    if [ -z "$line" ] ; then

        echo "make: *** No rule to make target \`$2_config'.  Stop." >&2

        exit 1

    fi

    set ${line}        # 把line成员设置为参数$1, $2, $3, $4…

    # add default board name if needed

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

fi

# 结果：line= Active arm armv7 am33xx ti am335x am335x_evm am335x_evm:SERIAL1,CONS_INDEX=1,NAND

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

# 参数个数为7或8

[ $# -lt 7 ] && exit 1

[ $# -gt 8 ] && exit 1

# Strip all options and/or _config suffixes

CONFIG_NAME="${7%_config}"                              # 去掉$7的“_config” CONFIG_NAME= am335x_evm

[ "${BOARD_NAME}" ] || BOARD_NAME="${7%_config}"        # BOARD_NAME= am335x_evm

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=

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

    cpu=

fi

[ "$6" != "-" ] && board="$6"                           # board= am335x

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

[ "$4" != "-" ] && soc="$4"                             # soc=am33xx

[ $# -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

    tmp="${8%:*}"

    if [ "$tmp" ] ; then

        CONFIG_NAME="$tmp"                          # CONFIG_NAME= am335x_evm

    fi

    # Check if we only have a colon...

    if [ "${tmp}" != "$8" ] ; then

        options=${8#*:}                             # options= SERIAL1,CONS_INDEX=1,NAND

        TARGETS="`echo ${options} | sed 's:,: :g'` ${TARGETS}" # TARGETS= SERIAL1 CONS_INDEX=1 NAND

    fi

}

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

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

    exit 1

fi

#

# Test above needed aarch64, now we need arm

#

if [ "${arch}" = "aarch64" ]; then

    arch="arm"

fi

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

#

if [ -n "$KBUILD_SRC" ] ; then

    mkdir -p ${objtree}/include

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

    cd ${objtree}/include

    mkdir -p asm

else

    cd arch/${arch}/include                 # cd arch/arm/include

fi

rm -f asm/arch                              # 删除arch/arm/include下的asm/arch

if [ "${soc}" ] ; then

    ln -s ${LNPREFIX}arch-${soc} asm/arch   # 创建软连接arch -> arch-am33xx

elif [ "${cpu}" ] ; then

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

fi

if [ -z "$KBUILD_SRC" ] ; then              # 判断$KBUILD_SRC是否为空，为空返回真

    cd ${srctree}/include                   # cd include

fi

#

# Create include file for Make

#

( echo "ARCH   = ${arch}"                   # ARCH   = arm

    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}"                  # CPU    = armv7

    fi

    echo "BOARD  = ${board}"                # BOARD  = am33xx

    [ "${vendor}" ] && echo "VENDOR = ${vendor}"   # VENDOR = ti

    [ "${soc}"    ] && echo "SOC    = ${soc}"      # SOC    = am33xx

    exit 0 ) > config.mk                           # 创建config.mk

# Assign board directory to BOARDIR variable

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

    BOARDDIR=${board}

else

    BOARDDIR=${vendor}/${board}                    # BOARDDIR=ti/am33xx

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   # 默认创建新文件

Fi

# 往include/config.h 文件中写入配置参数等

echo "/* Automatically generated - do not edit */" >>config.h

for i in ${TARGETS} ; do

    i="`echo ${i} | sed '/=/ {s/=/    /;q; } ; { s/$/    1/; }'`"

    echo "#define CONFIG_${i}" >>config.h ;

done

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

[ "${board}"  ] && echo "#define CONFIG_BOARDDIR board/$BOARDDIR" >> config.h

cat << EOF >> config.h

#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