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DM8168 dvrrdk tftp加载uImage启动后，在挂载文件系统之前，还有一次dhcp，
怎么关闭呢，想使用静态的IP地址，
bootargs 你那里是设置为 ip=dhcp么
DM81xx_DVR_RDK_Install_Guide.pdf 里有讲的，
Use the following steps to setup the boot arguments
i. bootargs
a. For static IP
UBOOT# setenv bootargs 'mem=256M console=ttyO2,115200n8 root=/dev/nfs
rw nfsroot=192.168.1.151:/home/work/netra/dvr/rfs
ip=${ipaddr}:${serverip}:${gatewayip}:${netmask}::eth0:off
vram=20M notifyk.vpssm3_sva=0xBEE00000'
b. For DHCP based IP
rw nfsroot=192.168.1.151:/home/work/netra/dvr/rfs ip=dhcp
vram=20M notifyk.vpssm3_sva=0xBEE00000
