>From sunsolve........

Pulling out a keyboard from a live
system and reconnecting it also causes the system to drop to the OK prompt.
How can we prevent this ?

Solution Summary 

This can be accomplished in many ways. Some of the recommended methods
are discussed below.

1.The file /etc/default/kbd can set a variable called KEYBOARD_ABORT.
Uncomment the line containing this variable in this file as shown below:

KEYBOARD_ABORT=disable

Then run the command "kbd -i" or simply reboot the system.The "kbd -i"
command will force the system to reread the /etc/default/kbd file.

This will permanently disable all the STOP+A and serial device break
signals on the system.

You can re-enable the break sequence by commenting out this line in the
/etc/default/kbd file and rebooting the system or running the "kbd -i" 
command again.

2. You can enable/disable breaks with out changing any file entries
from the command line as well. 

The " kbd -a enable" will enable the system to start accepting the
break signal and the "kbd -a disable" will disable the system from
accepting the break signal. These changes will be temporary and 
be in effect only till the system reboots.

3. You can also reboot the system after setting the following variable
in /etc/system file as shown:

set abort_enable=0 

This will disable all break signals on the system.

Solaris 8 introduced a new feature which gives the system the
ability to force a hanging system to halt when required, without
allowing random or spurious Breaks to cause an unintentional stop. The
new sequence to stop the system is <RETURN> <TILDE> <CONTROL B>.There
must be an interval of more than 0.5 seconds between characters, and
the entire string must be entered in less than 5 seconds.  This is true
only with serial devices acting as consoles and not for systems with
keyboards of their own.

This feature has been backported to Solaris 2.6 and Solaris 7 as well. The
patch 105924-10 for Solaris 2.6 and 107589-02 or higher for Solaris 7 is
required to enable this feature.

To enable the alternate boot sequence, just type "kbd -a alternate" or
if this change needs to be permanent, reboot the system after
uncommenting the following line in the /etc/default/kbd file :

KEYBOARD_ABORT=alternate 

Note: a) Do not uncomment the KEYBOARD_ABORT=disable line while doing this.
      b) Do not set abort_enable=0 in /etc/system while doing this.

----------

You can setup "alternate break", which is tilde-control b, on Solaris
now so you don't have to worry about spurious break signals taking your
server down.  You can still disable the break, but on a headless system
you'd have no way to get to "ok" when you want.

Check infodoc 21258 for details on Solaris 2.6 and 7 since they have
some patch requirements for that, but on Solaris 8, just uncommnet the
"KEYBOARD_ABORT=alternate" line in /etc/default/kbd and reboot OR
uncomment that line and run the command "kbd -a alternate".

There is more info on the alternative break sequence in the man pages
for the serial devices (zs and se).

ML Starkey