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

> One wonders if it does some SMM trick to capture port 0x80 writes and 
> attempt to haul them off for debugging; it almost sounds like some kind 
> of debugging code got let out into the field.

Not implausible. We've got a bug I've been dealing with where a vendor
left debug stuff enabled via the parallel port and which clearly
"escaped" from the test environment to the BIOS proper.
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References:
- Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops
  - From: "H. Peter Anvin" <[email protected]>
- Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops
  - From: David Newall <[email protected]>
- Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops
  - From: Paul Rolland <[email protected]>
- Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops
  - From: Rene Herman <[email protected]>
- Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops
  - From: David Newall <[email protected]>
- Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops
  - From: Rene Herman <[email protected]>
- Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops
  - From: David Newall <[email protected]>
- Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops
  - From: "linux-os (Dick Johnson)" <[email protected]>
- Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops
  - From: Andi Kleen <[email protected]>
- Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops
  - From: Rene Herman <[email protected]>
- Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops
  - From: Pavel Machek <[email protected]>
- Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops
  - From: Rene Herman <[email protected]>
- More info on port 80 symptoms on MCP51 machine.
  - From: "David P. Reed" <[email protected]>
- Re: More info on port 80 symptoms on MCP51 machine.
  - From: Rene Herman <[email protected]>
- Re: More info on port 80 symptoms on MCP51 machine.
  - From: Rene Herman <[email protected]>
- Re: More info on port 80 symptoms on MCP51 machine.
  - From: Alan Cox <[email protected]>
- Re: More info on port 80 symptoms on MCP51 machine.
  - From: "H. Peter Anvin" <[email protected]>

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