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

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.

This is very helpful. So the next question is there something on the laptop mainboard.

Any idea how to look for such a thing? I am not averse to taking the laptop apart to look at the mainboard.

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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]>
  • RE: More info on port 80 symptoms on MCP51 machine.
    • From: "Allen Martin" <[email protected]>

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