Power5 9133-55A Serial Console connection issue Post: 302966598

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Operating Systems AIX Power5 9133-55A Serial Console connection issue Post 302966598 by bakunin on Sunday 14th of February 2016 05:38:21 AM

02-14-2016

Registered User

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

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LEARN ABOUT OSF1

scc

scc(7)							 Miscellaneous Information Manual						    scc(7)

NAME

       scc - Serial keyboard/mouse/communications interface

SYNOPSIS

       controller   scc0   at tc0   slot 3   vector sccintr

DESCRIPTION

       Two  base  board  Zilog scc dual UARTS provide DEC 3000 series personal systems with keyboard, mouse, and serial communications interfaces.
       The serial communications interfaces can operate at baud rates from B50 to B57600 (see tty(7)).

       The driver for the scc interface supports hardware flow control using the Request to Send (RTS) and Clear  to  Send  (CTS)  signals.   When
       hardware  flow  control is enabled, the flow of input data is controlled by the RTS signal and the flow of output data is controlled by the
       CTS signal.  If the CTS signal is off, the driver will suspend output to that line until the CTS lead is reasserted.  Likewise, the  driver
       will  turn off the RTS lead to tell the device connected to the line to stop sending data as a result of congestion on the host side.  When
       the condition clears, the driver will turn on the RTS lead to tell the device to resume sending data.

       In alternate console configurations (that is, no graphics head), communications port 2 (/dev/tty01) becomes the system console. The  serial
       system console port always operates at 9600 BPS, 8-bits, no parity.  No modem or hardware flow control is supported.

RESTRICTIONS

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

       Only communications port 1 (/dev/tty00) includes full modem control.

FILES

       console terminal local terminal local terminal

RELATED INFORMATION

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

																	    scc(7)

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