Re: KERNEL BUG: console not working in linux

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

Followup to:  <20001128041409.A9525@veritas.com>
By author:    Andries Brouwer <aeb@veritas.com>
In newsgroup: linux.dev.kernel
>
> On Mon, Nov 27, 2000 at 05:40:58PM -0800, H. Peter Anvin wrote:
> 
> > > What about adding an additional
> > > 
> > > 	andb	$0xfe, %al
> > > 
> > > in front of the outb?
> 
> > Already in test12-pre1.
> 
> Ach, I see I am too slow - had not even seen -pre1 and now Linus
> already announces -pre2.
> 
> Anyway, I considered that this A20 stuff belonged to my docs on
> the keyboard controller, so added a page
> 
> 	http://www.win.tue.nl/~aeb/linux/kbd/A20.html
> 
> (written half an hour ago). Comments are welcome.
> 

One thing... the "thwarted by cache" comment probably isn't very
useful.  As far as I know the only machines which have the cache
problem are i386 boxen, but the i386 doesn't have WBINVD.  The i486
has a pin on the CPU for A20, which takes effect inside the L1 cache,
and so it shouldn't have any A20 cache issues.

	-hpa

-- 
<hpa@transmeta.com> at work, <hpa@zytor.com> in private!
"Unix gives you enough rope to shoot yourself in the foot."
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