默认启动参数：

bootargs=root=/dev/mtdblock2 rootfstype=yaffs2 init=/linuxrc console=ttySAC0,115200

bootcmd=nand read 0xc0008000 0x200000 0x500000;bootm 0xc0008000

baudrate=115200

ethaddr=00:40:5c:26:0a:5b

netmask=255.255.255.0

bootdelay=5

ipaddr=192.168.48.100

serverip=192.168.48.103

gatewayip=192.168.48.1

stdin=serial                //标准输入

stdout=serial              //标准输出

stderr=serial               //标准错误

nand flash分区：

Creating 4 MTD partitions on "NAND 4GiB 3,3V 8-bit":

0x000000000000-0x000000200000 : "Bootloader"

0x000000200000-0x000000700000 : "Kernel"

0x000000700000-0x00000cf00000 : "User"

0x00000cf00000-0x000100000000 : "File System"

export PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/arm/4.3.2/bin

sudo vi /etc/environment

PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/arm/4.3.2/bin

注意：

          ①"bootcmd=nand read 0xc0008000 0x200000 0x500000;bootm 0xc0008000"中相应地址是经过MMU映射过来的地址，不是具体的物理地址，

          ②OK6410的DDR地址范围：0x50000000-0x60000000共256M大小