How to change TMS320DM642 MAC address ?

Hi!

      I build a  web server on TSM320DM642 system ,and  I use TI's example demon .

       Now,I can run the project successfully, I can open the webpage of DM642 on my PC explore, and also I can change the IP address of DM642,but I can't change the MAC

     address of DM642. 

     TI's example demon gives  dm642  a  MAC address of  'D':'4':'A':'1':'Z':'1',  and can I change the MAC address? If can , how to chage ?

   thanks very much !!!