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

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

Allen Martin wrote:
> Nothing inside the chipset should be decoding port 80 writes.  It's 
> possible this board has a port 80 decoder wired onto the board that's 
> misbehaving.  I've seen other laptop boards with port 80 decoders
> wired onto the board, even if the 7 segment display is only populated
> on debug builds.  
>
> We use PCI port 80 decoders internally for debugging quite often, so 
> if there were some chipset issue related to port 80 it would have 
> showed up a long time ago, and this is the first I've heard of
> hangs related to port 80 writes.

Presumably you have programmable decoders to trigger SMI?  If not, then 
they're probably doing the equivalent in a SuperIO chip or similar.

	-hpa
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