I try to program the SPI-flash memory for AR4100 wifi module. To do that I follow an app note called "Programming the AR4100 SIP and SPI-flash on the Freescale Tower". One of the items needed to be programmed is the MAC address. I assume the MAC address should be a 12-digit unique number. So my question is how can I get or generate a new MAC address for my phy chip? Is there any process we can use for our production line?