LKML: Alan Cox: Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.

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"H. Peter Anvin"
- "David P. Reed"
  - Alan Cox
    - Jan Engelhardt
      - "H. Peter Anvin"

Date	Sat, 15 Dec 2007 17:46:58 +0000
From	Alan Cox <>
Subject	Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.

> My understanding is that the linux starts in real mode, and uses the 
> BIOS for such things as reading the very first image.   

Not always. We may enter from 32bit in some cases, and we may also not
have a PC BIOS in the first place.

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