2楼的方法没错，下面是StellarisWare驱动库的示例代码，基本思路就是这样，能正确收到数据那应该就没什么问题了。需要自己把Loopback功能打开。Loopback功能在Ethernet PHY Management Register 0 – Control (MR0)这个寄存器里。
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示例代码
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unsigned char pucMACAddress[6];
unsigned char pucMyRxPacket[];
unsigned char pucMyTxPacket[];
unsigned long ulMyTxPacketLength;
//
// Initialize the Ethernet controller for operation
//
EthernetInitExpClk(ETH_BASE, SysCtlClockGet());
//
// Configure the Ethernet controller for normal operation
// Enable TX Duplex Mode
// Enable TX Padding
//
EthernetConfigSet(ETH_BASE, (ETH_CFG_TX_DPLXEN | ETH_CFG_TX_PADEN));
//
// Program the MAC Address (01-23-45-67-89-AB)
//
pucMACAddress[0] = 0x01;
pucMACAddress[1] = 0x23;
pucMACAddress[2] = 0x45;
pucMACAddress[3] = 0x67;
pucMACAddress[4] = 0x89;
pucMACAddress[5] = 0xAB;
EthernetMACAddrSet(ETH_BASE, pucMACAddress);
//
// Enable the Ethernet controller
//
EthernetEnable(ETH_BASE);
//
// Send a packet.
// (assume that the packet has been filled in appropriately elsewhere
// in the code).
//
EthernetPacketPut(ETH_BASE, pucMyTxPacket, ulMyTxPacketLength);
//
// Wait for a packet to come in.
//
EthernetPacketGet(ETH_BASE, pucMyRxPacket, sizeof(pucMyRxPacket));
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