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 Message-ID: <19970913122832.XI49952@uriah.heep.sax.de> In-Reply-To: <199709130509.PAA20233@godzilla.zeta.org.au>; from Bruce Evans on Sep 13, 1997 15:09:59 %2B1000 References: <199709130509.PAA20233@godzilla.zeta.org.au>
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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. ;-)
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