It’s like CoffinOS found on the Vampire Cards but it’s for the PiStorm. It will be a bespoke build of Amiga OS 3.9. With a load of extras. So nothing vanilla about it.
Ah, in that case I can say "not supported", you're on your own.
AmigaOS 3.9 should work. AmigaOS 3.2.2.1 should work. But either of those with a ton of extra patches and hacks I wouldn't expect to work correctly. Even the plain versions of 3.9 and 3.2 are temperamental. I want to rebuild it with the 3.2 NDK and (if necessary) ditch 3.9, to see if that makes it more stable - the classes can then work more or less exactly as they do in OS4 so it should help. But the NDK won't work properly in my build environment currently.