On Thu, Nov 13, 2003 at 03:14:25PM -0800, collver1@comcast.net wrote:
> Hello,
> 
> I have read that the standard PCI bus can be clocked at 20 to 33MHz, and
> the specification provides for it being clocked at 66MHz.  It appears I can
> find whether a device is going 66MHz in NetBSD.  In my computer it appears
> my on-board IDE is going at 33MHz and AGP is going at 66MHz.
> 
> $ pcictl /dev/pci0 dump -b 000 -d 01 -f 0 | grep -e Device -e 66
>     Device Name: 82845G/GL Host-to-AGP Bridge (0x2561)
>       66 MHz capable: on
> 
> $ pcictl /dev/pci0 dump -b 000 -d 31 -f 1 | grep -e Device -e 66
>     Device Name: 82801DB IDE Controller (UltraATA/100) (0x24cb)
>       66 MHz capable: off
> 
> Is there any other way to detect the PCI bus timing on a typical PC?

Unfortunably no

> 
> How common is it for a PCI bus to be timed slower than 33MHz?

Overclocked systems, and older Pentium/pentium pro with a speed multiple
of 25 or 30 Mhz instead of 33 (e.g. 180Mhz vs 200).

-- 
Manuel Bouyer <bouyer@antioche.eu.org>
     NetBSD: 24 ans d'experience feront toujours la difference
--