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Date:      Wed, 21 Oct 1998 10:20:01 +0200
From:      sthaug@nethelp.no
To:        Tor.Egge@fast.no
Cc:        freebsd-current@FreeBSD.ORG, freebsd-hardware@FreeBSD.ORG
Subject:   Re: Problems with Digital server with P-166 and Neptune chipset
Message-ID:  <11701.908958001@verdi.nethelp.no>
In-Reply-To: Your message of "Wed, 21 Oct 1998 06:05:06 %2B0200"
References:  <199810210405.GAA07127@midten.fast.no>

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> > I now have some more info. Built a kernel with debug info, built an aout
> > gdb. I have two identical machines running 3.0-RELEASE now, and both of
> > them are crashing the same way (page fault in kernel mode) and in the
> > same place (the zalloc inline routine in vm/vm_zone.h).
...
> Looking at you dmesg output (from an earlier message), I find
> 
> 	real memory  = 269221888 (262912K bytes)
> 
> instead of the expected
> 
> 	real memory  = 268435456 (262144K bytes)
> 
> which indicates that the speculative memory probe stopped at 0x0100C0000,
> i.e. at the end of aliased VGA memory.

Yes, that was indeed the problem. Adding a suitable MAXMEM, as suggested,
cured it. And I learned something about kernel debugging. Thanks a lot!

Steinar Haug, Nethelp consulting, sthaug@nethelp.no

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