我用的开发板是Stratix II EP2S180 DSP Development Board,所用软件都是6.0，在运行nios ii 提供的 Simple Socket Server 例子时时出现一下错误：
nios2-terminal: connected to hardware target using JTAG UART on cable
nios2-terminal: "USB-Blaster [USB-0]", device 1, instance 1
nios2-terminal: (Use the IDE stop button or Ctrl-C to terminate)


Simple Socket Server starting up
Your Ethernet MAC address is 00:07:ed:0e:b4:7c

[lwIP]: See STDERR for expanded diagnosis translation.
[lwIP]: [init_done_func] Fatal: lwip_devices_init failed, perhaps ethernet inter
face.
[lwIP]: ERRNO: :

[lwIP]: See STDERR (FAULT_LEVEL is SYSTEM).
[lwIP]: FAULT_LEVEL is SYSTEM.
[lwIP]: FATAL Error, Restart required.
[lwIP]: Locking scheduler - endless loop.
请高手指点，小弟万分感谢！