Does anyone know, how much OS4 for classic and OS4 for A1 actually differ?
While the classic bootloader should be relatively simple (the hardware is initialized by Kickstart and very well known), the completely different hardware might be a large obstacle for running the OS on a Mac.
The A1 bootloader expects a Uboot machine (which we don't have), checks some dongle (we don't have either), but it expects a PCI architecture (yeah!) and brings along some hardware drivers we could need.
So, if the classic version supports a PCI architecture/HAL as well, it shouldn't be too hard to write a new bootloader (essentially what Moana does) and write a stub to adapt the HAL (I have no idea how much OF and Uboot differ here). This may sound naive - and will still be quite a bit of work - but if this is worked on on a scale like AROS, it's certainly doable. Of course we'd need hardware drivers as well, but as soon as the gfx hardware can be used as a simple framebuffer, it would be usable.
The other option you're just talking about, is to make AROS OS4 binary compatible - I guess that's a more complex task.
