DragonBoard 845c (RB3) assigning random MAC address at every restart

I have DragonBoard 845c (RB3) and am seeing a random MAC address on wlan0 at every boot up. Can you guide me how to keep the MAC address permanent? ( I am using linaro 20.07 OS).

Thanks for your help.

Are you referring to the WiFi address or Ethernet address? Are you running debian or OE/RPB?

WiFi address. Debian.