Messages in this thread | | | Date | Wed, 12 Dec 2007 13:05:33 -0800 | From | "H. Peter Anvin" <> | Subject | Re: More info on port 80 symptoms on MCP51 machine. |
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Rene Herman wrote: > On 12-12-07 21:26, Rene Herman wrote: > >> On 12-12-07 21:07, David P. Reed wrote: > >>> Someone might have an in to nVidia to clarify this, since I don't. >>> In any case, the udelay(2) approach seems to be a safe fix for this >>> machine. > > By the way, _does_ anyone have a contact at nVidia who could clarify? > Alan maybe? I'm quite curious what they did... > > Summary: > > Unless after booting with "acpi=off", outputs to port 0x80 (the legacy > way to delay I/O) reliably, but not immediately, hang MCP51 machines. > Outputs to port 0xed do not indicating it's a not a generic bus abort > problem. >
Sorry, the first sentence didn't parse unambiguously for me. Do you mean "acpi=off" works, or that "acpi=off" allows *subsequent* boots to work?
I have some people at nVidia I can probably ping.
-hpa
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