From owner-freebsd-alpha  Thu May 30  8:45:41 2002
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Date: Thu, 30 May 2002 11:45:19 -0400 (EDT)
To: Allen Thomas <w3craft@attbi.com>
Cc: freebsd-alpha@FreeBSD.ORG
Subject: Re: XFree86 & Alpha Demi-Sable
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Allen Thomas writes:
 > > unexpected machine check:
 > >
 > >     mces    = 0x1
 > >     vector  = 0x670
 > >     param   = 0xfffffc0000006000
 > >     pc      = 0x16037e600
 > >     ra      = 0x12006caf0
 > >     curproc = 0xfffffe00059d04c0
 > >         pid = 153, comm = XFree86
 > >

<..>

 > > unexpected machine check:
 > >
 > >     mces    = 0x1
 > >     vector  = 0x670
 > >     param   = 0xfffffc0000006000
 > >     pc      = 0x16037e600
 > >     ra      = 0x12006caf0
 > >     curproc = 0xfffffe00059d0a40
 > >         pid = 203, comm = XFree86
 > >
<..>

 > > unexpected machine check:
 > >
 > >     mces    = 0x1
 > >     vector  = 0x670
 > >     param   = 0xfffffc0000006000
 > >     pc      = 0x16037e600
 > >     ra      = 0x12006caf0
 > >     curproc = 0xfffffe00059d0a40
 > >         pid = 189, comm = XFree86
 > >
 > > panic: machine check


Well, at least it is consistant.

The problem is that X is accessing the hardware in ways that the
hardware doesn't like.  This could be due to bugs in X itself, or in
my platform support code for this model of alpha.  This sort of
problem is _very_ hard to track down. 

Are you familiar enough with gdb to build X with symbols, and set a
breakpoint prior to the instruction which is panic'ing the machine?

Another approach would be to try a different kind of graphics boards.
Did it crash the same way with the Qvision? Do you have any PCI matrox
boards?

Drew

PS: Wilko, didn't you say you'd run X on some sort of sable?

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