Unable to find Valid MAC address

The software in NIOSII IDE is based on Simple_socked_server,I want to kown the communication mechanism clearly,so I post serveral stupid questions below,thanks for your help!!!

in iniche_init.c:

1: the funtion "get_board_mac_addr()"seems to get MAC address for nichestack tcp/ip stack system,the MAC address is the address of tse controller,these MAC address are placed in Flash memory,It means that I should write address into Flash,but how to realize it?

the error "Invalid MAC Address stored at Flash Offset 0x8000"，maybe generated by that.

2:according to the .pdf ,the NEEK development board acts as DHCP client,so the PC acts as DHCP server,I connect NEEK and PC directly,and try to run a DHCP server software on PC.

the error "DHCP timed out, going back to default IP address(es)"maybe generated by that.

has somebody ever used sss tenplate ?

what i analyse above are right ?

thanks