From owner-freebsd-bugs Sat Sep 13 03:51:50 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.7/8.8.7) id DAA27785 for bugs-outgoing; Sat, 13 Sep 1997 03:51:50 -0700 (PDT) Received: from sax.sax.de (sax.sax.de [193.175.26.33]) by hub.freebsd.org (8.8.7/8.8.7) with SMTP id DAA27758 for ; Sat, 13 Sep 1997 03:51:44 -0700 (PDT) Received: (from uucp@localhost) by sax.sax.de (8.6.12/8.6.12-s1) with UUCP id MAA20274 for freebsd-bugs@FreeBSD.ORG; Sat, 13 Sep 1997 12:51:43 +0200 Received: (from j@localhost) by uriah.heep.sax.de (8.8.7/8.8.5) id MAA20571; Sat, 13 Sep 1997 12:28:32 +0200 (MET DST) Message-ID: <19970913122832.XI49952@uriah.heep.sax.de> Date: Sat, 13 Sep 1997 12:28:32 +0200 From: j@uriah.heep.sax.de (J Wunsch) To: freebsd-bugs@FreeBSD.ORG Subject: Re: kern/4486 References: <199709130509.PAA20233@godzilla.zeta.org.au> X-Mailer: Mutt 0.60_p2-3,5,8-9 Mime-Version: 1.0 X-Phone: +49-351-2012 669 X-PGP-Fingerprint: DC 47 E6 E4 FF A6 E9 8F 93 21 E0 7D F9 12 D6 4E Reply-To: joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch) In-Reply-To: <199709130509.PAA20233@godzilla.zeta.org.au>; from Bruce Evans on Sep 13, 1997 15:09:59 +1000 Sender: owner-freebsd-bugs@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk As Bruce Evans wrote: > >The problem in question was IMHO non-existing adapter memory (the MDA > >frame buffer on an S3 card running in color mode). You can never be > >sure about misbehaving hardware in such cases. That's not only > > I think you can be fairly sure about the behaviour of nonexistent ISA > memory. Also if the nonexistent ISA memory is (bogusly) decoded by an adapter card? I don't trust it, and it often enough doesn't make sense at all to dump these memory regions. (I've seen a fairly weird memory-mapped IO handling on the HP ``Cascade'' Ethernet chips, that makes me a little overcautious here.) > >> Does the broken system also hang for 64-bit video accesses via the FPU? > > > >How would this be done? > > Just access it via 64-bit FPU instructions. Will have to try this at work. -- cheers, J"org joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE Never trust an operating system you don't have sources for. ;-)