zynq-70007Z020双网卡调试网卡芯片采用两片RTL8201FMII模式注意：图中R920需要去掉。设备树添加&gem0{compatible=“cdns,zynq-gem”;status=“okay”;phy-mode=“mii”;clock-frequency=<25000000>;xlnx,ptp-enet-clock=<0x69f6bcb>;phy-handle