[rescue] SUMMARY: 7043-260 serial console help - no login prompt
mickey at denver.net
Fri Aug 31 09:22:29 CDT 2007
I'm now seeing a normal login prompt on the serial console (tty0).
This was accomplished through software, not by building a new
serial cable. After about 20 years of dealing with the RS232
"standard", I get very irritated, grumpy, and impatient every time
I have to build a custom DB9 or DB25 connector for a specific
machine. So, I avoid it if at all possible.
A *BIG* Thank You to Patrick Finnegan who sent me this single
line AIX command:
chdev -l tty0 -P -a runmodes=hupcl,cread,brkint,icrnl,opost,tab3,onlcr,isig,icanon,echo,echoe,echok,echoctl,echoke,imaxbel,iexten,clocal -a logmodes=hupcl,cread,echoe,cs8,clocal
While this command looks intimidating, it just sets the default
behavior for tty0, plus adds "clocal" which means "without modem
control". Also, I added the -P. Since tty0 is in use as the
console, it's properties cannot be changed while the machine is
running. -P makes the changes effective after reboot.
So I still have the same terminal server cables and connectors
for all my machines (Sun, HP, IBM), and life is good.
On Thu, 30 Aug 2007, Patrick Finnegan wrote:
> Run this (as all one line:)
> chdev -l tty0 -a
> -a logmodes=hupcl,cread,echoe,cs8,clocal
> I think that missing "clocal" on logmodes will make the system not even
> put up a login prompt if it's missing the right handshaking lines,
> which sounds like it's what your problem may be.
> Purdue University Research Computing --- http://www.rcac.purdue.edu/
> The Computer Refuge --- http://computer-refuge.org
On Thursday 30 August 2007, Scott Mickey wrote:
> Wise Rescuers,
> I have an IBM 7043-260 (headless), with a 9600-8-N-1 serial cable on
> tty0. Installation of AIX 5.2 goes fine using the serial console, and
> after install I am able to telnet into the box OK. However, I get no
> login prompt on the serial cable console.
> The terminal server hardware I'm using works OK with all Sun SPARC
> and HP PA-RISC machines, and OK with the IBM 7043-260 during install.
> It appears the IBM serial port changes it's behavior after AIX 5.2
> boots. This web page says this is the case, anyway:
> I would like to have login access on the serial port ...
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