New subject: 2.11BSD boot looping

29 Nov 1999

Hi -

...
  From: James Lothian &lt;simul8(a)simul8.demon.co.uk&gt;
 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
 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 
	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
	program. 

	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 ;-(

	Steven Schultz

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 From Martin Crehan &lt;mjcrehan(a)earthlink.net&gt; Wed
Dec  1 01:59:21 1999 
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From: Martin Crehan &lt;mjcrehan(a)earthlink.net&gt;
Subject: Salon.com article on John Lions book
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The site Salon.com has an article:
http://www.Salon1999.com/tech/feature/1999/11/30/lions/index.html
on John Lions' book about Sixth Edition Unix, written by from a non-computer
geek's viewpoint.

Martin Crehan

Re: 2.11BSD boot looping