[rescue] Break signals [was: Booting from LOM?]

[Julius Sridhar]

On Sun, 10 Feb 2002, Scott Newell wrote:

> >A break is a certain signal (low for a exceptional moment, don't
> >remember about details. Pulling the cable out sends a break :-D )
>
> You know, I've read this bit about pulling the cable sending a break
> before, but always in relation to the Sun serial console.  I've _never_
> seen it in the embedded world or with PC hardware.  Is there something
> peculiar to the Sun hardware?  Did they add bias resistors to force the
> line into an unusual state on purpose?
>
> For what it's worth, I hot plug my serial console on IPX and SS2 machines
> all the time, and I've yet to see 'em halt.  But I'm running OpenBSD and
> NetBSD--maybe they don't listen for break signals.

It shouldn't be pulling the cable.  It should be turning off the terminal
while the cable is still attached.

Peace...  Sridhar