Re: Flash Back -- kernel 2.1.111
Vojtech Pavlik (vojtech@suse.cz)
Sun, 24 Feb 2002 23:10:02 +0100
On Mon, Feb 25, 2002 at 09:01:06AM +1100, Paul Mackerras wrote:
> Vojtech Pavlik writes:
>
> > On Sun, Feb 24, 2002 at 02:29:03PM -0600, Troy Benjegerdes wrote:
> > > I believe there are systems with 33mhz pci and 50mhz pci. Trying to find a
> > > 'common' base clock just seems to be an excercise in confusion. The only
> > > thing that really makes sense is 'how fast is said PCI device clocked'.
> >
> > Show me one.
>
> We have some RS/6000 machines that have two separate PCI buses (two
> host bridges) that run at 33MHz and 50MHz respectively. Fortunately
> we also get a device tree from the firmware that tells us this.
I really wonder why the 50 MHz one doesn't run at 66 MHz, and what
happens if you plug in a 66MHz non-capable card to the 50 MHz bus.
--
Vojtech Pavlik
SuSE Labs
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