Re: Test Patch: 2.5.69 Interrupt Latency
Paul Fulghum (paulkf@microgate.com)
15 May 2003 14:59:39 -0500
On Thu, 2003-05-15 at 14:42, Paul Fulghum wrote:
> On Thu, 2003-05-15 at 13:11, Alan Stern wrote:
> > Maybe they are an Intel-specific addition? Or perhaps a more
> > recent version of the spec has more information -- the one I've got is 1.1
> > (March 1996).
>
> I can't find any later documents.
>
> > Can you suggest a good way of detecting whether or not a controller is
> > part of a PIIX4 chipset, to indicate whether or not the OC bits are valid?
>
> I don't see a generic way to determine the validity of these bits.
>
> I think the PCI ID is the only way:
> Vendor ID 8086
> Device ID 7112
>
> The erratum is only for the PIIX4, and it is
> triggered only when the OC inputs are active,
> so limiting the check to that device should
> be OK.
More clarification (at a suggestion from Charles Lepple):
The errata covers all steppings of the 82371AB/EB/MB
with a note that this bug will never be fixed
in these devices.
So checking for 8086:7112 should be sufficient without
a need to check the version number.
--
Paul Fulghum, paulkf@microgate.com
Microgate Corporation, http://www.microgate.com
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