There is a version of Slackware Linux, ARMed Slack, that is (obviously) compiled for ARM. There's so much proprietary hardware in the 770 that unless someone really gets to work on it, it won't be on your 770's screen any time soon. I started out with Slackware in 1995 or 1996 (I don't remember anymore). Let's just say there was a chance my monitor could've caught fire (very rare though) when I was probing it for appropriate scan rates. The good old days.

Anyway, there's really no option yet. Hopefully soon, I laid my 770 down for the past 6 months but have come back to it as a media device as opposed to an online one. It's been given new life with the addition of the Canola media suite.