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Full Discussion: Power5 9133-55A Serial Console connection issue
Operating Systems AIX Power5 9133-55A Serial Console connection issue Post 302966598 by bakunin on Sunday 14th of February 2016 05:38:21 AM
Old 02-14-2016
Quote:
Originally Posted by Devyn
The thought that the HMC connection might disable the console port seamed like an odd thing to do to me so didn't consider to test it, even though it crossed my mind. I also tried to unplug the ethernet cables from the HMC ports to see if the serial ports would be reenabled but it doesnt' work in reverse. Once you power the Power5 server on or plug in the HMC cables, either action has the effect of permanently disabling the serial ports. Strange design but ok.
Both the serial connection and the network connection (to the HMC) are handled by the "Service processor" (which is about the same as a PCs ILO.board combined with some BIOS functionality). Because the HMC provides a serial console via the HMC web interface ("Open console terminal") the serial port is disabled when the system is connected (and recognized) by a HMC. Because the HMC is a separate machine and could go down, be reinstalled, etc., the system remembers that it is connected to one and stays that way even if the HMC is not connected (this is why it did not revert when you unplugged the network).

There are methods to deconfigure a configured HMC on the system (this is for POWER 7, but POWER5 is practically identical). You need to use the "pocket-calculator"-like device hanging ususally out of the system for that. (IIRC waiting also helps, but takes 14 days since the last HMC connection.)

Sometimes in the transition between POWER4 and POWER5 the speed of the console was set from 9600 u,1,p to 19200 u,1,p. Its been a long time since but as far as i remember all the POWER5 and some of the POWER4 were on 19200, the systems before are all using 9600, the systems after that are all 19200.

I hope this helps.

bakunin
These 2 Users Gave Thanks to bakunin For This Post:
Devyn hicksd8
 

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LEARN ABOUT OSF1

dc

dc(7)							 Miscellaneous Information Manual						     dc(7)

NAME

       dc - serial line/mouse/keyboard

SYNOPSIS

       controller   dc0   at ibus0   slot 0   vector dcintr

DESCRIPTION

       The  dc	serial	line controller provides DECstation 2100, DECstation 3100, DECstation 5000, and DECstation 5100 computer systems with key-
       board, mouse, and serial communications interfaces. The serial communications interfaces on the DECstation 2100 and DECstation 3100 provide
       partial	modem  control.  The  serial communications interfaces on the DECstation 5000 provide full modem control.  The device special file
       /dev/tty01 on a DECstation 5100 provides full modem control, while the remaining ports provide no modem control at all.	All serial  commu-
       nications interfaces operate at baud rates from B50 to B9600, excluding B200.

       The  dc	ports  are  used as follows: Usage Graphics device keyboard at 4800 BPS Mouse or tablet at 4800 BPS Communications port 1 (w/modem
       control)/local terminal Communications port 2 (w/modem control)/local terminal

       On all systems except the DECstation 5100, serial port 2 is used for the system console port in server (that is,  non-graphics)	configura-
       tions.  On DECstation 5100s, the serial port labeled 3 on the back of the system is always the system console port.  The serial system con-
       sole port always operates at 9600 BPS, 8-bits, no parity; modem control is not supported.

RESTRICTIONS

       Data communications equipment attached to the console serial port in server configurations must be set to 9600 BPS, 8-bits, no parity.  The
       scc driver enforces this restriction.

FILES

       console terminal local terminal local terminal local terminal (DECstation 5100 only)

RELATED INFORMATION

       console(7), devio(7), tty(7), MAKEDEV(8) delim off

																	     dc(7)
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