linux-kernel - Re: Linux 2.6.18-rc6

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Message-Id: <1158378424.2661.150.camel@fc6.xsintricity.com>
Date:	Fri, 15 Sep 2006 23:47:04 -0400
From:	Doug Ledford <dledford@...hat.com>
To:	James Bottomley <James.Bottomley@...elEye.com>
Cc:	Olaf Hering <olaf@...fle.de>, Linus Torvalds <torvalds@...l.org>,
	linux-scsi@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 2.6.18-rc6

On Thu, 2006-09-07 at 09:04 -0500, James Bottomley wrote:
> On Thu, 2006-09-07 at 11:15 +0200, Olaf Hering wrote:
> > This does not work: ahc_linux_get_signalling: f 56f6
> > 
> > echo $(( 0x56f6 & 0x00002 )) gives 2, and the ahc_inb is called.
> 
> Erm, there's something else going on then:  An ultra 2 card has to have
> this register.  It's used to signal mode changes in
> ahc_handle_scsiint().  The piece of code in there will trigger and read
> this register for any ultra 2 + controller every time there's an error
> (just to see if the bus mode changed).

Sorry for my belated response, but this usually happens when you access
an aic chipset too soon after a chip reset.  Try putting a delay before
whatever access is causing this to see if it make s difference.  Common
problems include after a chip reset, touching any register will cause
the card to reset, etc.

-- 
Doug Ledford <dledford@...hat.com>
              GPG KeyID: CFBFF194
              http://people.redhat.com/dledford

Infiniband specific RPMs available at
              http://people.redhat.com/dledford/Infiniband

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