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Reply-To: shimon@simon-shapiro.org
Organization: The Simon Shapiro Foundation
From: Simon Shapiro <shimon@simon-shapiro.org>
To: Bill G <billg@cyberwar.com>
Subject: RE: DPT PM3334UW reboot hangs
Cc: freebsd-scsi@FreeBSD.ORG
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X-Loop: FreeBSD.org


Bill G, On 09-Feb-99 you wrote:
>  
>  I am having trouble with my DPT SmartRaidIV PM3334UW raid controller on
>  FreeBSD 3.0 and later.  I am currently running FreeBSD-3.1-BETA cvsup'd
>  on 2/9/99...The problem is that whenever I reboot the machine, it hangs
>  on the DPT bios 'Waiting for adapter'...If I walk over to the machine
>  and hit the reset button it comes up fine...any ideas?

Known problem.  The code in the kernel that is supposed to actually send a
reset to the PCI bus does not.  It is quite possible that the BIOS on the
Motherboard gets the correct call from the kernel, but does not actually go
to the PCI bus to reset it all.

the DPT driver, at shutdown shuts down the DPT.  this is done to ensure
that all caches are flushed, etc.  Failing to do that may cause up to 64MB
of disk WRITEs to not go to disk and trash numerous filessystems.

If you are brave (unwise?), you can try the following (in
sys/dev/dpt/dpt_scsi.c):

  Comment out the entire contents of the function dptshutdown.

Build a kernel and see if this cures the ``hang''.

PLEASE NOTE THE FOLLOWING:

IT IS ALMOST CERTAIN THAT THIS PROCEDURE WILL CAUSE SEVERE DATA LOSS AND
IRREVERSIBLE DAMAGE TO YOUR FILESYSTEMS!!!





Sincerely,

Simon Shapiro
Research Fellow, Office of Technology         ShapiroS@MindSpring.com
MindSpring Enterprises, Inc.                   404.815.0770 ext. 2057


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