Messages in this thread | | | Subject | Re: Test Patch: 2.5.69 Interrupt Latency | From | Paul Fulghum <> | Date | 15 May 2003 14:59:39 -0500 |
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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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