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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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Message-ID: <3sbk15$66@bonnie.tcd-dresden.de>
References: <3s9rcs$n0k@euas20.eua.ericsson.se>
Reply-To: joerg_wunsch@uriah.heep.sax.de
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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. ;-)