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

["H. Peter Anvin" <hpa@zytor.com>]

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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