*BSD News Article 91829


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From: kato@eclogite.eps.nagoya-u.ac.jp (KATO Takenori)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: Am5x86/P75 WB caching...
Date: 23 Mar 1997 03:22:32 GMT
Organization: Nagoya University Computation Center
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Message-ID: <5h27lo$f2c$1@news.cc.nagoya-u.ac.jp>
References: <5gnrql$2ut@usenet88.supernews.com>
	<5gpmhp$hc7@verdi.nethelp.no>
	<5gso69$eqb@usenet88.supernews.com>
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In article <5gso69$eqb@usenet88.supernews.com>
	 <jca@bighorn.accessnv.com>wrote:

> Is there a way to force FreeBSD to enable write back caching though?  It
> may not be enabling it for my particular chipset (SiS EISA chipset).  I
> know that write back is working from MS-DOS and Win 3.x because of
> the results of various utilities (i.e. cachchk6).

Am5x86 does not support software configuration for write-back mode.
If WB/#WT pin is 1 at reset time, then CPU cache is in write-back
mode.  This cannot be controled by software.


----
KATO Takenori <kato@eclogite.eps.nagoya-u.ac.jp>
Dept. Earth Planet. Sci., Nagoya Univ.,  Nagoya, 464-01, Japan
PGP public key: finger kato@eclogite.eps.nagoya-u.ac.jp
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