[19006] in Athena Bugs
Re: sun4 9.0.9: workstation
daemon@ATHENA.MIT.EDU (Roger A. Roach)
Thu Jul 5 10:02:37 2001
Message-Id: <200107051402.KAA00582@rar.mit.edu>
To: Garry Zacheiss <zacheiss@MIT.EDU>
cc: "Roger A. Roach" <rar@MIT.EDU>, bugs@MIT.EDU
In-Reply-To: Your message of "Wed, 04 Jul 2001 00:53:08 EDT."
<200107040453.AAA12723@coleco-sidewinder.mit.edu>
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Date: Thu, 05 Jul 2001 10:02:34 -0400
From: "Roger A. Roach" <rar@MIT.EDU>
Garry,
I did the "eeprom ttya-rts-dtr-off=true" and tried the reboot. No help.
I've
put it back to false.
Roger
> 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
>
>
