Unable to find Valid MAC address

thanks for your reply!~

The .pdf says :"if get_board_mac_addr() is unable to find MAC address,refer to your board's user guide for instructions on restoring the MAC address,or hard code the MAC address in the get_mac_addr()function"

I can only restore the factory state, but factory state seems not contain setting MAC address.So,I got ready to restore the MAC address of the NEEK development board ,but according to the chapter "rebuiding the factory image" of NEEK user guide,first I built the boot code ,but I could not generate the file"app_select_boot_code.srec"...

1:so ,how to restore the MAC address?

2: Could someone explain for me --"hard code the MAC address "?

thanks!!~