@Piru
Last I checked the only flashing tools available were for the OEM gfxcards.
So how exactly would anyone flash their Mac Mini?
Linux has PROC, it makes possible quite many things like dumping firmwares of your graphics cards and such. Maybe it's possible to write on it too, I think it can be possible.
So maybe using Linux could solve the problem of AmigaOS4 not running, ironic eh? :-D