I am new to Raspberry Pi and linux, but I decided to try my hand at making a PiBoy. I am using a B+ and a TinyLCD3.5 screen attached by the GPIO. After days of configuration, I finally have the drivers for the screen working and Retropie installed. My issue is that Retropie only outputs via the HDMI out and the screen sits on Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent permitted by applicable law. When I hit F4, it drops to the command line.
How do I have Retropie point to my LCD screen and not HDMI out?