> Cache coherency may not matter and in fact I am fairly sure because
> of the way MorphOS is architected and based on the AmigaOS API,
> there is a built-in, 20 year old system for managing non-coherent DMA
> and peripherals (remember the m68k was not cache coherent)

"the system doesn't have cache coherency, something which MorphOS requires."
http://www.amiga.org/forums/showpost.php?p=665328

I also stumbled over that post. I thought it was as Neko said. Pity if Piru is right - would rule out MorphOS on any 512x device.