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Date:      Fri,  3 Mar 2000 18:03:27 -0500 (EST)
From:      Andrew Gallatin <gallatin@cs.duke.edu>
To:        Wilko Bulte <wilko@yedi.iaf.nl>
Cc:        "Waite, Michael" <Michael.Waite@compaq.com>, freebsd-alpha@FreeBSD.ORG
Subject:   Re: Alpha ISO is fantastic!
Message-ID:  <14528.17265.955978.964252@grasshopper.cs.duke.edu>
In-Reply-To: <20000303232726.A5993@yedi.iaf.nl>
References:  <212CC57E84B8D111AD780000F84AA049083C2C11@mroexc2.tay.dec.com> <20000303232726.A5993@yedi.iaf.nl>

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Wilko Bulte writes:
 > I'd be very interested to see how the XP1000 behaves running X as I see
 > problems on all my Alphas (Miata GL , Miata MX5 and EB64+/Aspen Alpine)
 > when running X.

I suspect that it will do much better because a tsunami chipset
behaves a lot like an x86 on bad accesses -- reads to bad addresses in
device memory return -1 and writes are ignored.  All other platforms
give you a machine check.  This confused the heck out of me when I was
doing the tsunami support.

On a related note -- Wilko, can you try compiling X with either -O or
-O0?  I just tracked down a nasty bug troubling somebody else which
was caused by gcc generating bad code.  I have a sneaking suspicion
that the compiler might be behind at least some of your pain.

Cheers,

Drew

------------------------------------------------------------------------------
Andrew Gallatin, Sr Systems Programmer	http://www.cs.duke.edu/~gallatin
Duke University				Email: gallatin@cs.duke.edu
Department of Computer Science		Phone: (919) 660-6590



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