RetroPie on Rock64

[BigSkyEntertainment]

You have many gaming OSes for the R64 - Lakka, Recalbox, Battocera, RetroArena (which is RetroPi) and probably others.

Hm. I've been using Recalbox (in spite of the current Dragonblaze image's issues) because I personally don't like Lakka as much... But this is the first I've heard of Batocera and RetroArena being available for the Rock64... Why aren't they on the Software Release wiki page? 

 
Same here, I had tried several from the release wiki page but this is the first I heard of Batocera and RetroArena for the Rock64. In searching, I found RockPro64 images for Batocera and RetraArena. Are those images compatible with the Rock64 as well?

The RockPro64 image cannot run on Rock64 SBC

Thank you. Luke had mentioned Battocera and RetroArena were available for the Rock64 but I haven't been able to find any of those images (just those labeled as for the RockPro64). I found one thread where RetroArena was mentioned, but the links were dead.