OK210 uboot 配置 笔记

U-Boot是universal bootloader，也就是通用的bootloader。

U-Boot 源码文件下包括一些目录文件和文本文件，这些文件可分为”与平台相关的文件”和”与平台无关的文件”，其中common文件夹下的文件就是与平台无关的文件；与平台相关的文件又分为CPU级相关的文件和与板级相关的文件：arch目录下的文件就是与CPU级相关的文件，而board、drivers、include等文件夹下的文件都是与板级相关的文件。我们在移植的过程中，需要修改的文件也就是这些与平台相关的文件。

内存采用了4片64Mbit x 16 I/Os的1Gb DDR2 SDRAM。

①解压源码后进入目录执行make forlinx_linux_config:

CURDIR 为 makefile 内嵌变量,即当前路径 参考http://qgjie456.blog.163.com/blog/static/354513672007629677779/

 <span style="white-space:pre">	</span>SRCTREE		:= $(CURDIR)
	MKCONFIG	:= $(SRCTREE)/mkconfig
	ifneq ($(OBJTREE),$(SRCTREE))
	obj := $(OBJTREE)/
	src := $(SRCTREE)/
	else
        obj :=
        src :=
        endif
        export obj src
	forlinx_linux_config :	unconfig
		@$(MKCONFIG) $(@:_config=) arm s5pc11x smdkc110 samsung s5pc110 linux
		@echo "TEXT_BASE = 0xcc800000" > $(obj)board/samsung/smdkc110/config.mk</span>

等效于mkconfig forlinx_linux arm s5pc11x amdkc110 samsung s5pc110 linux

board/samsung/smdkc110/config.mk中内容为"TEXT_BASE = 0xcc800000"

②mkconfig分析：

#$0	       $1		     $2   $3      $4      $5     $6      $7
#mkconfig forlinx_linux arm s5pc11x smdkc110 samsung s5pc110 linux
APPEND=no	# Default: Create new config file
BOARD_NAME=""	# Name to print in make output

#$#为参数个数，排除掉-- -a -n选项
while [ $# -gt 0 ] ; do
	case "$1" in
	--) shift ; break ;;
	-a) shift ; APPEND=yes ;;
	-n) shift ; BOARD_NAME="${1%%_config}" ; shift ;;
	*)  break ;;
	esac
done


#BOARD_NAME 设置为 forlinx_linux
[ "${BOARD_NAME}" ] || BOARD_NAME="$1"


#参数个数即不小于4，也不大于7
[ $# -lt 4 ] && exit 1
[ $# -gt 7 ] && exit 1

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

if [ "$SRCTREE" != "$OBJTREE" ] ; then
#执行下方
else
	cd ./include									#进入include
	rm -f asm
	ln -s asm-$2 asm	#设置asm-arm 指向 asm
fi

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 #设置arch-s5pc110 指向 asm-arm/arch 
fi

# create link for s5pc11x SoC
if [ "$3" = "s5pc11x" ] ; then
        rm -f regs.h
        ln -s $6.h regs.h			#s5pc110指向regs.h
        rm -f asm-$2/arch
        ln -s arch-$3 asm-$2/arch	#arch-s5pc11x 指向 asm-arm/arch
fi


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

#./include/config.mk中的内容
ARCH   = arm
CPU    = s5pc11x
BOARD  = smdkc110
VENDOR = samsung
SOC    = s5pc110
#


if [ "$APPEND" = "yes" ]	# Append to existing config file
then
	echo >> config.h			#建立config.h
else
	> config.h		# Create new config file
fi
echo "/* Automatically generated - do not edit */" >>config.h

#forlinx add 
if [ "$7" = "linux" ]
then
	echo "#define CONFIG_LINUX_FORLINX  1" >>config.h
else
	echo "#define CONFIG_ANDROID_FORLINX 1" >>config.h	#linux下输入这一句
fi

#echo "#include <configs/$1.h>" >>config.h
#forlinx change  for linux and android 
echo "#include <configs/smdkv210single.h>" >>config.h	#输入

#./include/config.h的内容

/* Automatically generated - do not edit */
#define CONFIG_LINUX_FORLINX  1
#include <configs/smdkv210single.h>
#

综上，即：

BOARD_NAME 设置为 forlinx_linux  

设置./include/asm-arm 指向 ./include/asm

设置./include/arch-s5pc110 指向 ./include/asm-arm/arch 后又被替换

s5pc110指向regs.h

arch-s5pc11x 指向 asm-arm/arch

proc-armv指向asm-arm/proc

新建./include/config.mk中的内容
ARCH   = arm
CPU    = s5pc11x
BOARD  = smdkc110
VENDOR = samsung
SOC    = s5pc110

新建./include/config.h的内容
/* Automatically generated - do not edit */
#define CONFIG_LINUX_FORLINX  1
#include <configs/smdkv210single.h>