Are there any specs for the UNI-N chip?  Checked the apple
web site. Except for some references to the chip, nothing :-(

Thanks
Sanjay


Benjamin Herrenschmidt wrote:

> On Fri, Jan 14, 2000, Sanjay Lal <sanjayl@iqmail.net> wrote:
>
> >Is the UniNorth Bridge the Motorola MPC107, or an entirely different chipset?
>
> Entirely different Apple custom chipset.
>
> It contains internally 3 PCI buses with different io and config spaces
> (unfortunately, they share the same bus number which is quite annoying
> for linux, maybe not for netbsd, I don't know).
>
>   - The AGP bus with the video board
>   - The external PCI bus which can run at either 33 or 66Mhz (runs at 33
> on iBook and, I think, iMacs, and at 66MHz on G4. On the G4, it's routed
> to a DEC PCI<->PCI bridge which converts this 32bit/66MHz bus to a
> 64bits/33MHz bus)
>   - The internal PCI bus on which there are some PCI devices cells that
> are internal to the uni-n chip. To my kowledge, there is the gmac
> ethernet controller (used on the iBook and on recent versions of the G4,
> possibly on recent iMacs too) for which I'm currently writing a Linux
> driver. It's basically a Sun "GEM". And there is a firewire controller
> which is not used yet. (Apple uses an external Texas controller on the
> iMacDV and the G4)