Thanks for replying.
Well I'll be damned! The above didn't actually work, but what I decided to do was:
Boot up android, go to the device tree folder, grab those files and just look at them with a hex editor.
On my particular box, which is a Sunvell T95M S905X 2G/8G, the correct configuration is as follows:
It did turn the screen on, but it looks a bit messed up. I guess the LCD is wired differently on this box than it is on the Tanix.
But now that I got it working, I'll fix the mapping tomorrow.