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Path: utzoo!watmath!clyde!floyd!harpo!seismo!hao!denelcor!csu-cs!bentson
From: bentson@csu-cs.UUCP (Randolph Bentson)
Newsgroups: net.bugs.4bsd
Subject: 4.2 dmf problems (won't answer, etc) and a fix
Message-ID: <2538@csu-cs.UUCP>
Date: Mon, 9-Apr-84 15:14:48 EST
Article-I.D.: csu-cs.2538
Posted: Mon Apr  9 15:14:48 1984
Date-Received: Wed, 11-Apr-84 05:48:41 EST
Organization: Colo. St Univ, C.S. Dpt.
Lines: 19

We too had a problem similar to those reported for dh and dz
(doesn't answer, hangs on open, etc.).  This appeared on the
DMF-11 with 4.2BSD.

We actually found a fix!

There's reference to a byte-sized portion of a register that
should be addressed as a word.  This has the effect of clearing
another bit in the register (in the other byte). You'll find
a reference
    addr->dmftms = 0;
that should be changed to
    addr->dmftba = addr->dmftba & (~(DMF_ON<<8)|0xff);
so as not to clear the "ON" bit.  If I was more confident
about the compiler's action it could use the "&=" form.

Randy Bentson
Colorado State University - Computer Science
hao!csu-cs!bentson