Summary:Probe-scsi on Ultra Sparc 170

Date: Fri Sep 27 1996 - 11:27:10 CDT

 Sun Managers,

Thank You for your responses.Thanks to everyone who responded and to
those whose reply has not yet reached me.

The general opinion was that it is possible to do a probe-scsi only after
setting the autoboot flag to false and then doing a reset-all
However one of the replies also pointed that it is possible to do a
probe-scsi with autoboot flag true if L1-A key is pressed just as the
monitor screen becomes alive.Apprantly both the solution work.

I am attaching the replies for the Group.

With Best Regards

So far the best solution I have found is to turn auto=boot off...
no other way I've found to do it with out hanging the machine....

 Daniel Blander =8^)
 Sr. Systems Engineer Applied Computer Solutions
 Phone: (714) 842.7800 Fax: (714) 842.8299
 The Official Applied Computer Solutions Home Page
             and Tech Tip of the Week:

[there was a discussion on the news about this; if you like to see the
full thread search DejaNews for

        newsgroup: comp.sys.sun.admin
          subject: probe-scsi hangs my Ultra-1/170

Here's important article (a follow up with a quote) I saved. Hope this
helps -FvD-]

From: John Hunter <>
Newsgroups: comp.sys.sun.hardware,comp.sys.sun.admin
Subject: Re: probe-scsi hangs my Ultra-1/170
Date: Thu, 20 Jun 1996 15:58:27 -0400
Organization: NASA Langley Research Center, Hampton, VA USA
Message-ID: <>
References: <> <31>

Shutdown -h now will take you to boot prompt. I think it's init 0 but I'm not sure about that.
read the man page on init and inittab.

Manish Doshi, .............. ___ _/| .. __ __ .. ___ _/| ...........
Dept. of Computer Science \ x x ' / o O \ \ o O
University of Houston ( ^ ) ( ^ ) ( ^ )
Houston, TX 77004 ............. U ........ U ........ ~ ...............

Email :-
         Work:(408)285-6561 Home:(415)967-3445
The reason you are getting those messages is once the system scans the
SCSI chains, a probe-scsi command will hang the machine. It is a bug
with the most recent boot proms. To get past this problem SUN is
telling everyone to do the probe-scsi before the system has a chance to
do much of anything, ie. not to let the boot prom boot or the system to
come up. A "stop-A" then probe-scsi will definatly hang the system.
Your best bet is to reboot the box, and as soon and the vid card
initializes (ie. your screen comes active) hit "stop-A" then do a

Craig Ledbetter
Systems Engineer
Home Account Network Inc.
setenv auto-boot? false

setenv auto-boot? true

it dis-allows the probe because it will change the state of the scsi
controller on a possibly booted machine ...


I noticed that on an ultra sparc 170 as well.. the probe-scsi
command just hangs...

Please send me anything you find!

Susan KJ Thielen System/Network Manager
Imaging Lab, Robarts Research Institute Phone: (519) 663-5777x4029
PO Box 5015, 100 Perth Drive Fax: (519) 663-3900
London, ON N6A 5K8 Canada E-mail:
I have to set autoboot to OFF for prob-scsi to work.

do a L1-A from the ok prompt do
setenv auto-reboot false
then do a reset-all

this will prevent it from auto booting (I'm not positive the variable is
called 'auto-reboot' but you can do a printenv to find out, it's either
called 'auto-reboot' or 'auto-boot')


Raju Krishnamurthy - Senior Software Engineer

E C O l o g i c C o r p o r a t i o n
19 Eye Street, N.W.
Washington, DC 20001

v. 202.218.4100
f. 202.842.5088

I, too, have been experiencing the same probe-scsi problems with an Ultra-2.
We found that if you interrupt the boot process with a STOP-A BEFORE the
memory initializing starts, then you will not cause the hang . You will
still get the warning message but it usually won't hang.
Hope this helps.

Bob Brown Chrystal Software
Network Support A Xerox New Enterprise Company 619.676.7754 Voice 619.676.7710 Fax

You can't do it with auto-boot on.
You must temporarily turn off auto-boot, e.g.:

setenv auto-boot false
setenv auto-boot true
First, do reset-all
Then, when it comes up again, do L1-A before it boots.
Do a probe-scsi

IT will warn you - ignore its warning and probe anyway.
You will be fine.

This is what I do with my UltraSparc 2/170.

Martin Espinoza      Systems Administrator
You can shoot a ballistics expert, and you can brainwash a 
psych student.

You need to modify the prom auto-boot? to be false then a reset will not cause a reboot.

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Mike (Mehran) Salehi (716) 422-2725 =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

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