Re: More info on port 80 symptoms on MCP51 machine.

Chuck Ebbert
2007-12-14T22:06:44Z

On 12/12/2007 04:05 PM, H. Peter Anvin wrote:
> 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.
>

Have them search on Google for:

hp tx1000 noapic

:)