itop4412 uboot 学习详细记录四丶Exynos4412 编译Makefile的配置文件config.mk分析)

一、打开Makefile文件：

itop_4412_android_config: unconfig

@$(MKCONFIG) $(@:_config=) arm arm_cortexa9 smdkc210 samsung s5pc210 //@:指的是当前target，也即itop_4412_android

OBJTREE := $(if $(BUILD_DIR),$(BUILD_DIR),$(CURDIR))
SRCTREE := $(CURDIR)
TOPDIR := $(SRCTREE)
LNDIR := $(OBJTREE)
export TOPDIR SRCTREE OBJTREE

MKCONFIG := $(SRCTREE)/mkconfig
export MKCONFIG //分析得出 MKCONFIG 其实为CURID/mkconfig，即为当前编译目录下的mkconfig文件路径

//转换出来就是 mkconfig itop_4412_android arm arm_cortexa9 smdkc210 samsung s5pc210

二、打开mkconfig文件

#!/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
TARGETS=""

while [ $# -gt 0 ] ; do #如果参数数量 > 0
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 ;;
esac
done

[ "${BOARD_NAME}" ] || BOARD_NAME="$1"

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

if [ "${ARCH}" -a "${ARCH}" != "$2" ]; then
echo "Failed: \$ARCH=${ARCH}, should be '$2' for ${BOARD_NAME}" 1>&2
exit 1
fi

echo "Configuring for ${BOARD_NAME} board..."

#
# 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 #链接asm->asm-arm
fi

rm -f asm-$2/arch #删除asm-arm/arch目录

if [ -z "$6" -o "$6" = "NULL" ] ; then
ln -s ${LNPREFIX}arch-$3 asm-$2/arch
else
ln -s ${LNPREFIX}arch-$6 asm-$2/arch # 链接asm-arm /arch-> arch-s5pc210
fi

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

#
# Create include file for Make
#
echo "ARCH = $2" > config.mk
echo "CPU = $3" >> config.mk
echo "BOARD = $4" >> config.mk

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

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

# Assign board directory to BOARDIR variable
if [ -z "$5" -o "$5" = "NULL" ] ; then
BOARDDIR=$4
else
BOARDDIR=$5/$4
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
fi
echo "/* Automatically generated - do not edit */" >>config.h

for i in ${TARGETS} ; do
echo "#define CONFIG_MK_${i} 1" >>config.h ;
done

cat << EOF >> config.h
#define CONFIG_BOARDDIR board/$BOARDDIR
#include <config_defaults.h>
#include <configs/$1.h>
#include <asm/config.h>
EOF

exit 0

for i in ${TARGETS} ; do
echo "#define CONFIG_MK_${i} 1" >>config.h ;
done

cat << EOF >> config.h
#define CONFIG_BOARDDIR board/$BOARDDIR
#include <config_defaults.h>
#include <configs/$1.h>
#include <asm/config.h>
EOF

exit 0