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From: "Rodney W. Grimes" <rgrimes@gndrsh.aac.dev.com>
Message-Id: <199506231651.JAA10776@gndrsh.aac.dev.com>
Subject: Re: 2.05R reboot hangs
To: petri@ibr.cs.tu-bs.de
Date: Fri, 23 Jun 1995 09:51:01 -0700 (PDT)
Cc: jan@todonix.ping.de, bugs@FreeBSD.org
In-Reply-To: <199506230918.LAA29871@achill.ibr.cs.tu-bs.de> from "Stefan Petri" at Jun 23, 95 11:18:45 am
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> 
> Hi!
> 
> > > > sometimes the reboot hangs on an 486-DX4-100 PCI (ASUS4SP3G - Board).
>  
> > > CHeck that you have your external cache set to write-through mode,
> > > and ISA GAT mode disabled in the BIOS setup screens.
> 
> Rodney>	Have you customized the kernel for the machine?  Or are you running
> Rodney>	the GENERIC kernel.  I have had 2 sites report ASUS-PCI/I-486SP3G boot
> Rodney>	hangs when using the GENERIC kernel
> 
> Rodney>	Have you triple checked your SCSI bus termination, and when the hang
> Rodney>	happens does your SCSI drive LED tend to be on solid indicating a
> Rodney>	scsi bus hang?
> 
> I also have an 486-DX4-100 PCI ASUS SP3G, and with 2.0.5, reboot from
> GENERIC kernel hangs on about every 2nd try. This was never a problem
> with the 950412-SNAP, which I have rebootet remotely about 100 times
> without need to run to the machine's console. I have build a
> custom kernel only yesterday, I dont know yet if that behaves better.
> I have cache-write-back and ISA-GAT-enabled, and my SCSI-bus is
> triple-terminated (dont ask why ;-) but is quiescent when reboot
> hangs, However, as I said, this was no problem with the SNAP
> installation.

Set your cache to write through mode or expect to get signall 11's at
random.  The board (all version) has a cache write back coherency problem
when used with bus master PCI devices (the NCR SCSI controller is a 
PCI bus master).

Turn off ISA GAT mode, though you may not need to if you don't have any
ISA bus masters.

Properly terminate your SCSI bus.  There is *NEVER* a reason to have 3
terminators on a scsi bus, plain and simple you are asking for trouble
if you do that.

Please tell exactly what the last thing on the screen is after you
type reboot when the hang occurs (just the last line is all I need).

Compile a kernel with:
# BROKEN_KEYBOARD_RESET disables the use of the keyboard controller to
# reset the CPU for reboot.  This is needed on some systems with broken
# keyboard controllers.
options        "BROKEN_KEYBOARD_RESET"

in the config file.

Does doing that fix the problem?

What revision of the board do you have (printed on the board next to
the model number)?  I am starting to collect data on the versions of
the boards effected by this problem and if the BROKEN_KEYBOARD_RESET
fixes the problem.


-- 
Rod Grimes                                      rgrimes@gndrsh.aac.dev.com
Accurate Automation Company                 Reliable computers for FreeBSD