[rescue] RS/6000 7012 370

r.stricklin bear at typewritten.org
Tue Jun 10 21:34:26 CDT 2008

On Jun 10, 2008, at 12:24 PM, Halford Johnson wrote:

> After reseating all the cards and banging on the LEDs a couple more  
> times, I
> now believe that the code is '260' which means "information is being
> displayed on the display console".  There is still no monitor output
> though.  I am not sure what to do.

RS/6000 systems define their console in a firmware setting,  
manipulated by an AIX command 'chcons'.

If the system was defined with the graphics console, no amount of  
plugging in or unplugging a keyboard and monitor will change it to the  
serial port, and vice versa.

The other piece of "magic" is that AIX will not, by default, display a  
login banner on a serial terminal without working hardware flow  
control. A three-wire (or even five-wire) serial cable is not going to  
cut it.

Booting the install media in service mode will display a prompt on all  
configured devices capable of serving as a console, to configure that  
device as the console _for the purposes of installing AIX or  
performing maintenance from the miniroot shell_. You can, however, use  
this to get access to 'chcons' in order to change the console on an  
already-installed AIX system.


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