> 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).
>
Are you sure that it is an RS232 BRK, by that I mean, if you are in the
middle of a power-up/reboot, could it be a hardware reset pulse. (although
50ms is kinda wide). Have never seen the schematics, but seems possible.
>
> >> - 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 ;)
>
If it is a hardware thing, even the source wont help you. How are you at
digital design? You could probably whip out a box to filter the BRK
signal within some window around the power loss. OR, if <very big if> you
could get the schematics, you could probably piggyback a couple of gates
on your UARTs, connected to the reset lines with a one shot...
Or am I just showing my age...
>
> >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.
>
Can you disable that mode? Unless something REALLY strange is going on,
you should never need it on your sparcs. Mine never goes down, so access
to the bootstrap loader is never needed.
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