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

Rene Herman
2007-12-12T21:00:11Z

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.

Rene.