[19004] in Athena Bugs
Re: sun4 9.0.9: workstation
daemon@ATHENA.MIT.EDU (Garry Zacheiss)
Wed Jul 4 00:53:10 2001
Message-Id: <200107040453.AAA12723@coleco-sidewinder.mit.edu>
To: "Roger A. Roach" <rar@MIT.EDU>
cc: bugs@MIT.EDU
In-Reply-To: Your message of "Tue, 03 Jul 2001 08:36:12 EDT."
<200107031236.IAA00898@rar.mit.edu>
Date: Wed, 04 Jul 2001 00:53:08 -0400
From: Garry Zacheiss <zacheiss@MIT.EDU>
Hi,
A few questions about this:
>> I hooked it up to my new SunBlade (with 18.1" LCD Flat Screen
>> Monitor) and it seemed to work OK until I rebooted the system. When
>> the system rebooted, it was unable to communicate with the screen.
>> The screen had a floating message saying to check the cable and
>> connections. After a lot of playing around, we discovered that when
>> disconnected the serial port, it would boot fine.
Silly question: Are the machine and UPS actually turning on?
We've seen a failure mode where connecting a serial terminal to the DB9
port on an APC UPS would cause it to power off, and I'd like to make
sure we're not seeing that again.
Also, what sort of cable are you using? Are you using the same
one you were using previously? There might be straight through vs. null
modem sensitivity here.
Lastly, there are a couple of serial port settings from the Sun
boot ROM:
ttya-ignore-cd
If true, operating system ignores carrier-detect on
TTYA. Defaults to true.
ttya-rts-dtr-off
If true, operating system does not assert DTR and RTS
on TTYA. Defaults to false.
(from the "eeprom" man page). You might want to experiment with these,
along the lines of:
setenv ttya-rts-dtr-off true
at the "ok" prompt.
If all else fails, I might be able to come by and take a look;
debugging this might be easier with a machine to experiment with.
Garry
