Re: Can one suppress breaks on PM11 powerup?

Allen Pomeroy (apomeroy@spinnakertech.com)
Sat, 16 Aug 1997 12:22:19 -0600

At 12:29 16/08/97 -0500, Jake Messinger wrote:
>On Sat, 16 Aug 1997, Allen Pomeroy wrote:
>
>> I'm using a PM11 for a network based console on several Sun
>> workstations/servers. This works very slick, except I can't
>> seem to figure out how to suppress the break signals that the
>> PM11 generates on powerup (possibly during diagnostic phase?).
>
>Break signal? Not sue what you are referring to. Yuo mean when the thing
>powers up and resets the port? Hrm, try disabling hard flow control. Do
>you think its flow control or a signal in the transmit pin?

It is in fact a RS232 <break> (50ms mark) "character" that is
transmitted on all 10 ports. Only during the boot process of the
PM11. I will try the flow control settings (I have to go into work
for that).

[snip]

>> - this would probably involve changing ComOS (2.4?) which is no
>> longer supported (with respect to new features).
>
>This would be difficult.

Agreed. Unless livingston is willing to give me the source ;)

>You will not find anything much regarding the pm 11 anymore other than
>what Ive additionally written.

I'm finding this out -- I've spent about 2 months looking.

>Answer me this... What problem is it causing for you?

Sorry, I should have been more verbose in my original post;
the problem is that a Sparc piece of equipment treats a
break signal from the console port as a user's request to
drop into EPROM code (eg. temporarily halting the system).
On a PM11 boot, all Sparcs that are connected to that PM11
will receive a break at their console ports (and drop into
the EPROM monitor).

This specific topic could be a question for the Sun lists,
but if I can get the PM11 to stop generating breaks on boot,
then the problem is solved.

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Allen Pomeroy apomeroy@spinnakertech.com
Spinnaker Technologies 403-296-6604
Calgary, Alberta, Canada http://www.spots.ab.ca/~apomeroy

Solaris, HP/UX, AIX, Linux, Oracle System Support -- especially
if there's a sailboat involved...
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