Re: Flash Back -- kernel 2.1.111

Vojtech Pavlik
2002-02-24T22:10:02Z

On Mon, Feb 25, 2002 at 09:03:10AM +1100, Paul Mackerras wrote:
> Vojtech Pavlik writes:
>
> > > 83 MHz 55 MHz 41 MHz 0111 1101
> >
> > This one is a problem, because 41*2 != 55. However, this is also illegal
> > according to the PCI spec.
>
> Where does the PCI spec say that is illegal?

Well, I'm assuming the 41 MHz clocked bus is not a 66-MHz type PCI bus
(doesn't have the 66 MHz bit set and can't operate at 20.5 MHz if you
plug in a card that can't do 66 MHz operation), rather it's an
overclocked 33 MHz bus.

And running PCI over 33 MHz isn't legal in the PCI spec as far as I
know. You can go lower, but I think the limit is 16 MHz there.

--
Vojtech Pavlik
SuSE Labs