I bought one off of ebay.
The info on mine is
Driver: ILI9486
Dots: 320x480
SKU: MPI3501
I think it is a clone of the popular waveshare 3.5" screens which has a driver called lcd_show which is a shell script. I tried running that but didn't work due to no sudo.
Is it in the works to make these little screens work on emteria or indeed a way now to make them work? It connects via the gpio pins. Currently when I would boot with it plugged in it gives power but just shows a white screen.