Date: Thu, 30 Mar 2000 22:52:47 +0200 From: Wilko Bulte <wilko@yedi.iaf.nl> To: Andrew Gallatin <gallatin@cs.duke.edu> Cc: wilko@freebsd.org, Dave Haney <dave@engg.ksu.edu>, freebsd-alpha@freebsd.org Subject: Re: Unexpected machine check Message-ID: <20000330225247.C3785@yedi.iaf.nl> In-Reply-To: <14563.40742.553401.107502@grasshopper.cs.duke.edu>; from gallatin@cs.duke.edu on Thu, Mar 30, 2000 at 01:47:41PM -0500 References: <Pine.SO4.4.00.10003291814390.21551-100000@phobos.engg.ksu.edu> <20000330201513.A1750@yedi.iaf.nl> <14563.40742.553401.107502@grasshopper.cs.duke.edu>
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On Thu, Mar 30, 2000 at 01:47:41PM -0500, Andrew Gallatin wrote: > Wilko Bulte writes: > > > > There is definitely a bogon somewhere as far as X on Alpha goes. The problem > > seems to be core logic chipset related, people fortunate enough to own > > Tsunami based systems do not seem to have these problems. Also the type of > > VGA chip seems to matter. > > I suspect the real problem is bugs in the X server & that's why some > cards (Matrox, 3DLabs Permedia) work and others don't. The Tsunami > chipset itself just masks bugs. Like a PC, writes to invalid I/O > ports, etc are ignored & reads return -1. Such accesses will cause > machine checks on all other alphas. > > If somebody was to go through the effort of building one of these > failing X servers with symbols, the PC mentioned in the machine check I'll try doing that next week. Is there anything special to do when building the port? > would likely be the PC of the offending instruction. Or close to it. Would that be back-traceable to if it is the X server or the kernel? > In fact, I wonder if we couldn't hack up a kernel to send a sigbus to > the offending X server & get a core dump rather than panicing. Sounds reasonable.. a panic is a bit drastic ;) -- Wilko Bulte Arnhem, The Netherlands http://www.tcja.nl The FreeBSD Project: http://www.freebsd.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message
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