TM4C1294的uIP以太网例程问题

enet_uip这个例程里面

读本机MAC地址放到数组里面,,这我怎么找都没找到user register0,1啥时候存储的MAC地址啊,,,

//
    // Read the MAC address from the user registers.
    //
    ROM_FlashUserGet(&ui32User0, &ui32User1);
   
    //
    // Convert the 24/24 split MAC address from NV ram into a 32/16 split MAC
    // address needed to program the hardware registers, then program the MAC
    // address into the Ethernet Controller registers.
    //
    sTempAddr.addr[0] = ((ui32User0 >> 0) & 0xff);
    sTempAddr.addr[1] = ((ui32User0 >> 8) & 0xff);
    sTempAddr.addr[2] = ((ui32User0 >> 16) & 0xff);
    sTempAddr.addr[3] = ((ui32User1 >> 0) & 0xff);
    sTempAddr.addr[4] = ((ui32User1 >> 8) & 0xff);
    sTempAddr.addr[5] = ((ui32User1 >> 16) & 0xff);