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From: chris@mimsy.UUCP (Chris Torek)
Newsgroups: comp.unix.questions
Subject: Re: Vax processors
Message-ID: <7627@mimsy.UUCP>
Date: Tue, 21-Jul-87 10:07:04 EDT
Article-I.D.: mimsy.7627
Posted: Tue Jul 21 10:07:04 1987
Date-Received: Thu, 23-Jul-87 04:49:06 EDT
References: <138@bernina.UUCP> <13413@topaz.rutgers.edu> <7622@mimsy.UUCP>
Organization: U of Maryland, Dept. of Computer Science, Coll. Pk., MD 20742
Lines: 27

In article <7622@mimsy.UUCP> I wrote:
>We have an 8250.

(Actually, we have two, but one is still in shipping boxes,
and needs to stay that way until we have something that runs
one the machines.)

>... I borrowed an Ultrix 2.0 field test tape....  The field test
>kernel will not build, and the generic kernel's TCP or BVPNI
>Ethernet driver does not work

I should mention that field test 2.0 is not the same as Ultrix 2.0
(good thing too!); we just happened to have one such tape handy.

>... After much of hacking on my part, 4.3BSD finally boots, then
>promptly crashes (right after mapping the BUA I/O and register space
>... very strange).

Not so strange after all.  This is what I get for being careless
while installing Mike's new Unibus code.  My UMEMmap was 16 entries
too small, so the moment I clobbered the TLB, the machine read
through Usrptmap to find the kernel stack, but Usrptmap now pointed
off into Unibus space.  Oops.  Well, now I know what those things
in the 8200 machine check frame are all about.
-- 
In-Real-Life: Chris Torek, Univ of MD Comp Sci Dept (+1 301 454 7690)
Domain:	chris@mimsy.umd.edu	Path:	seismo!mimsy!chris