Possible good news: I was cleaning up MMU code (put back C++ exception handler now that WinUAE compiles as C++) and decided to disable some MMU table caching in MMU code (speed optimization)
NetBSD MMU error crash disappeared.
It seems cache gets out of sync in some situations ("slow" MMU table routines return "access ok" but cache says "nothing mapped here")
http://www.winuae.net/files/b/winuae.zip
I'll contact Aranym developers if I can't find any obvious reasons for this error (perhaps it is some Atari-specific assumption somewhere that simply won't work with Amiga or something..)
Hopefully it is now possible to create installed netbsd or linux hardfile
