linux-kernel - Re: [PATCH RFT 7/7] firewire: sbp2: add workarounds for 2nd and 3rd generation iPods

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Message-Id: <200901282218.42604.jarod@redhat.com>
Date:	Wed, 28 Jan 2009 22:18:42 -0500
From:	Jarod Wilson <jarod@...hat.com>
To:	Stefan Richter <stefanr@...6.in-berlin.de>
Cc:	linux1394-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org,
	Kristian Høgsberg <krh@...planet.net>
Subject: Re: [PATCH RFT 7/7] firewire: sbp2: add workarounds for 2nd and 3rd generation iPods

On Wednesday 28 January 2009 18:11:32 Stefan Richter wrote:
> Jarod Wilson wrote:
> > On Saturday 24 January 2009 13:46:44 Stefan Richter wrote:
> >>   - Do 2nd and 3rd gen. iPods actually have a model_id == 0, or do they
> >>     have in fact no model_id at all?
> >
> > So far as I can decipher (using Kristian's csr-dump utility), they really
> > do have model_id == 0.
>
> If model_id weren't there, the older ieee1394/sbp2 driver would log
> model_id 0 (and match against quirks list entries with ID 0), while
> firewire-sbp2 logs model_id 0xff000000 (which is an impossible value and
> thus indicates to those who want to write a new quirks list entry that
> there is actually no model_id...).  I will soon push the patch which
> makes sbp2 behave like firewire-sbp2 in this regard, to eliminate a
> potential source of conflicting user reports.

Okay, so yeah, they definitely both have model_id == 0.

firewire_sbp2: Workarounds for fw2.0: 0x48 (firmware_revision 0x0a2700, 
model_id 0x000000).

On a related note... The fix capacity workaround... I think I need to
observe this failure myself... My own 4th-gen ipod, when connected to a
Mac OS X system, reports the exact capacity I get if the fix capacity
workaround is disabled. Do they just know not to try to access that
last block, or is the need for this workaround a myth? :)

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

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