*BSD News Article 46206


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From: j@bonnie.heep.sax.de (J Wunsch)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: [Q] boot floppy & external cashe use
Date: 22 Jun 1995 13:26:29 +0200
Organization: Private U**x site, Dresden.
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Per-Einar Stromme <euanep@eua.ericsson.se> wrote:

>   The question
>	Does the 'FreeBSD boot floppy' make use of the external cashe
>	at all ? (on a 486DX2-66 with an external cashe)

It doesn't have any knowledge about chipsets, so it's using what your
chipset is set to.

>   The background
>	My PC stops with a `trap 0002` message when trying to boot OS/2
>	and using the external cashe.
>	I`ll explain below, why I`m using OS2.

Hmm, i guess it's the wrong group here. :-(


>	[BTW. is it possible to save the printouts from the booting 
>	 process ?]

You can later retrieve them with /sbin/dmesg.


>	The trouble is, that I had NO trouble at all, thus the question
>	in the begining.

Hmm, you're certainly the first one here *complaining* about this. :)

>    C000-C3FF Shadow RAM       | Into-486 | Disabled Enabled Cached
>    C400-C7FF Shadow RAM       | Cached   | Disabled Enabled Into-486

Btw., what memory regions are shadowed by those areas?


Well, i'm afraid you should ask in an OS/2 newsgroup for your OS/2
problem.  Maybe it's a known one.  You can hint them that your machine
is running FreeBSD fine... :^)

What makes me wonder is that your chipset setup apparently doesn't
support to specify whether your caches are write/through or write/
back only.  You can also try to play with the cache timings and see if
it would gain you something.
-- 
cheers, J"org                      private:   joerg_wunsch@uriah.heep.sax.de
                                   http://www.sax.de/~joerg/

Never trust an operating system you don't have sources for. ;-)