It also appears that at least one pilot has installed TopHat on an Open Vario platform running Android.

Chip Bearden

The Open Vario runs a version of Linux on a Cubieboard 2. Much faster than Android. The kits from Stefan Langer are a delight to assemble and can be "stalk" mounted if you want.
https://www.stefly.aero/

Caz Yokoyama has ported the TopHat software to the Open Vario and you can actually select either XCSoar, TopHat or LK8000 at boot, in the current system image. I've flown with both the 5.7 and 7" screens from Texim and they're both easy to see in direct sunlight.

Mike