From mboxrd@z Thu Jan  1 00:00:00 1970
From: simul8@simul8.demon.co.uk (James Lothian)
Date: Mon, 29 Nov 1999 14:55:49 +0000
Subject: 2.11BSD boot looping
References: <13503043955.14.DSEAGRAV@toad.xkl.com>
Message-ID: <384293F5.959724D5@simul8.demon.co.uk>

For what it's worth, this does sound suspiciously like what the 4.3
boot code did with the Viking. As far as I can remember, there is a 
flag in one of the UDA50 registers that is set to 1 one the device
interrupts. The 4.3 boot code runs the UDA50 with interrupts disabled,
but polls this flag to find out when the controller has finished a
command.
On the UDA50, even if interrupts are disabled, this flag gets set. On
the viking, it doesn't. I can't remember the exact change I made, but I
got it from the sources for some later version of 4.3, which I probably
found on the internet. I'll try firing the beast up tonight, and see if
I
can figure out what I did. 

My hacked around version of UW 4.3+NFS that Michael Sokolov uploaded
to PUPS should also contain this modification. Somebody could try 
comparing my version to the original UW version -- they're both in the
archive, as far as I know.

James

"Daniel A. Seagraves" wrote:
> 
> It's looping around at 157702.
> 
> 157702 contains 001776
> 
> -------