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SubjectRe: 2.1.101 patch to boot on toshiba Portege 660CDT laptop
Date
Followup to:  <355B663E.A224D40@menuett.rhein-main.de>
By author: Jens Maurer <jmaurer@menuett.rhein-main.de>
In newsgroup: linux.dev.kernel
>
> In addition to that, Alan Cox correctly pointed out a few months
> ago that the patch is rather unclean. Therefore, I developed a
> nicer patch (attached below) which checks if we are on a 486 or
> better and if so, disables the caches around the A20 toggle.
> This is actually against 2.1.58, but seems to patch and compile
> cleanly for 2.1.101 as well. Note that I no longer have access
> to such a broken laptop and therefore need YOUR help to get it
> tested.
>

This is the wrong approach. ALL 486+ CPU's apply A20M before the L1
cache, so the only thing that would make this solve the problem is the
possibility that you're slowing the machine down.

You're much better off trying to implement an A20M delay verification
(put a counter in the low 64K and compare to the corresponding word in
the HMA; loop and increase the counter until they no longer match.)

-hpa
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