.tar.gz     格式解压为          tar   -zxvf  

.tar.bz2   格式解压为          tar   -jxvf    

setenv ipaddr 192.168.2.230      
setenv ethaddr 00:04:9f:04:d2:22
setenv gatewayip 192.168.2.1     
setenv netmask 255.255.255.0     
setenv serverip 192.168.2.229    
saveenv
//开发板ip
//物理地址
//局域网的网关ip
//子网掩码
//虚拟机IP

setenv bootcmd 'tftp 80800000 zImage;tftp 83000000 imx6ull-14x14-emmc-4.3-480x272-c.dtb;bootz 80800000 - 83000000'
saveenv

setenv bootargs 'console=ttymxc0,115200 root=/dev/nfs nfsroot=192.168.2.229:/home/alientek/linux/nfs/rootfs,proto=tcp rw ip=192.168.2.230:192.168.2.229:192.168.2.1:255.255.255.0::eth0:off'
saveenv