Hi Ted,
I hooked up the Adafruit TFT via its 8-bit bus, and after a lot of optimizing got it to draw full screen refreshes at about 15 frames per second (my SPI trials only got 0.5 frames per second...).
You can check it out here Built a little Edison video game console running Doom, and I've described the hardware setup and have source on my website linked from there.
Cheers,
Lutz