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Message-Id: <200901281725.25750.jarod@redhat.com>
Date:	Wed, 28 Jan 2009 17:25:25 -0500
From:	Jarod Wilson <jarod@...hat.com>
To:	linux1394-devel@...ts.sourceforge.net
Cc:	Stefan Richter <stefanr@...6.in-berlin.de>,
	Kristian Høgsberg <krh@...planet.net>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFT 7/7] firewire: sbp2: add workarounds for 2nd and 3rd generation iPods

On Wednesday 28 January 2009 17:18:41 Jarod Wilson wrote:
> >   - Is the "no page tables" workaround really necessary for 2nd gen.
> >     iPods, or is the 128k limit sufficient as reported for the Ubuntu
> >     8.10 kernel?
>
> Looks to me like the no page tables workaround isn't needed. I could
> have sworn the defaults w/this patch (workarounds 0x48) was actually
> causing dd to fail last night, but I haven't been able to reproduce
> that failure, now that I'm trying (maybe I this ipod mixed up with one
> of the others in the pile...).

Yep, I'm a dummy. The failure I was thinking of was w/the completely
flaky 3rd-gen iPod, just went back and looked at logs.

So far as I can tell, I'm thinking 128k limit + fix capacity should be
okay for both the 2nd and 3rd-gen iPods, and if someone comes up with
evidence that the 2nd-gen does something badly w/the fix capacity
workaround enabled, then we revisit trying to apply the workarounds
more narrowly somehow.

-- 
Jarod Wilson
jarod@...hat.com

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