olinuxino-A20-micro-nfs

setenv bootargs ' '
setenv nfsargs 'setenv bootargs console=ttyS0,115200 root=/dev/nfs nfsroot=${serverip}:/home/nfs/arch mac_addr=${ethaddr}  ip=${ipaddr}:${serverip}:${gatewayip}:${netmask}::eth0:::'
setenv bootcmd 'dhcp; run nfsargs;  nfs 0x43000000 ${serverip}:/home/nfs/arch/script.bin;  nfs 0x48000000$ ${serverip}:/home/nfs/arch/uImage; bootm 0x48000000'

setenv serverip 10.0.0.109 (in my case nfs server)
setenv ethaddr 00:4e:56:a1:45:01 (the mac i choose)
saveenv
"/home/nfs/arch" is the path in my nfs server