SUMMARY: Ignore BREAK signal?

From: David Carlin (
Date: Thu Nov 18 1999 - 16:42:28 CST

This problem had a somewhat easy fix. The best solution was sent to me by
Brendan Choi who suggested installing patch 107589-02. Once you install
this patch just change this line in /etc/default/kbd :




or you can use the command "kbd -a alternate". Once you've done this,
reboot, and now only the alternate break sequence of "<CR> ~ ^b" will
get you into the PROM.

Special thanks to:

Brendan Choi <>
Devadas Vishwanath <>
Kevin Sheehan <>
Jesse Adam <>
Casper Dik <>
Brad Young <>
Don Varner <>
Raymond Wong <>
Dan Stromberg <>

> I know this topic has been discussed many times, but going through
> the summaries archive I haven't found a solution. I have an Ultra 1
> running Solaris 7 that I am using a serial console on. How can I stop it
> from going into PROM mode every time the PC on the other end is
> power-cycled? I have read about several hardware implementations to
> suppress the BREAK signal but I'd still like to be able to enter the PROM
> from the serial console. I also read about a package sun makes called
> "CONSULT-ZSBREAK" that lets you setup a different key sequence to go into
> PROM mode -- this would be ideal. Unfortunately, I've looked all over
> sun's site and can't find any reference to this :) Anyone know where I
> can get it? I've also heard this was only for SunOS and is incoporated
> into Solaris now. If so, how do I do it? I've looked all through the
> Solaris 7 AnswerBooks and haven't found anything.
> Basically, I want to use the serial console, and I'd like to be able to
> access the PROM easily from the serial console, but I don't want the Sun
> to go into PROM mode every time the PC is restarted.
> Any suggestions?

David Carlin -- | Case Western Reserve University
Unix Administrator, EECS Dept.     | 10900 Euclid Ave.
Phone: (216) 368-0355              | Olin Bldg. Rm. #414
Fax:   (216) 368-6888              | Cleveland, OH 44106-7071

This archive was generated by hypermail 2.1.2 : Fri Sep 28 2001 - 23:13:33 CDT