From: James Lothian <simul8(a)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,
Actually it's in the response packet rather than a UDA 'register' but
yep - that sounds very familiar.
but polls this flag to find out when the controller
has finished a
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
At least one of the changes was to give the MSCP adaptor a vector
during the 3 or 4 step init process. Normally 4.3/2.11 didn't bother
to give a vector since interrupts were disabled. It doesn't
reall matter what the vector is as long as it's non zero - the
value used was 0154 (primary/1st MSCP adaptor).
Some other 3rd party adaptors (can't recall if it was Dilog or
Emulex or ...) had the same problem.
"Daniel A. Seagraves" wrote:
> It's looping around at 157702.
> 157702 contains 001776
Hmmm, I wonder if that's in the bootblock code or the actual boot
The standalone MSCP driver in 2.11 has the "give a vector to the
adaptor" change so my guess is that the bootblock is where the
looping is happening. The bootbock (rauboot.s from /sys/mdec)
relocates itself to 0160000-01000 or 0157000 so a loop at 0157702
would be where the 'racmd:' routine is looping waiting for a
command to complete (or the adaptor to come ready the first time).
I thought the same "give a vector" change had been made to rauboot.s
but it would appear that's not the case ;-(
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From: Martin Crehan <mjcrehan(a)earthlink.net>
article on John Lions book
The site Salon.com
has an article:
on John Lions' book about Sixth Edition Unix, written by from a non-computer