So 
I am basically a novice. I have a D-link DIR 816 lying around. Wanted to install a custom firmware for fun but saw that it has none and there wasn't much in the forum except few discussions. I googled and did some research on my own on how to create my own firmware 
i already have a linux distro so setting up was easy but now i am stuck in selecting my device(Target Profile) as there is none in option. Is it only for creating firmware for already existing/supported devices in openwrt? is there any way i can create a firmware for my device?
my device config:
CPU: MediaTek MT7620A (580 MHz) 64 mb Ram with 16 mb flash