From: simul8@simul8.demon.co.uk (James Lothian)
Subject: 2.11BSD boot looping
Date: Mon, 29 Nov 1999 14:55:49 +0000 [thread overview]
Message-ID: <384293F5.959724D5@simul8.demon.co.uk> (raw)
In-Reply-To: <13503043955.14.DSEAGRAV@toad.xkl.com>
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
>
> -------
next parent reply other threads:[~1999-11-29 14:55 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <13503043955.14.DSEAGRAV@toad.xkl.com>
1999-11-29 14:55 ` James Lothian [this message]
1999-11-29 22:07 Steven M. Schultz
1999-12-08 21:09 ` Daniel A. Seagraves
1999-12-09 21:18 Daniel A. Seagraves
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