linux-kernel - Re: [PATCH 1/2] firewire: endianess fix

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Date:	Wed, 27 Feb 2008 22:21:38 -0500
From:	Jarod Wilson <jwilson@...hat.com>
To:	benh@...nel.crashing.org
Cc:	Stefan Richter <stefanr@...6.in-berlin.de>,
	Kristian Hoegsberg <krh@...planet.net>,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org,
	sparclinux@...r.kernel.org, linux1394-devel@...ts.sourceforge.net,
	Sam Ravnborg <sam@...nborg.org>,
	Harvey Harrison <harvey.harrison@...il.com>
Subject: Re: [PATCH 1/2] firewire: endianess fix

On Wednesday 27 February 2008 09:40:22 pm Benjamin Herrenschmidt wrote:
> On Wed, 2008-02-27 at 14:58 -0500, Jarod Wilson wrote:
> > On Saturday 23 February 2008 06:24:17 am Stefan Richter wrote:
> > > The generation of incoming requests was filled in in wrong byte order
> > > on machines with big endian CPU.
> > >
> > > Signed-off-by: Stefan Richter <stefanr@...6.in-berlin.de>
> > > Cc: sparclinux@...r.kernel.org
> > > Cc: linuxppc-dev@...abs.org
> > > ---
> > >
> > > This patch is a shot in the dark, based on a warning when building with
> > > C=1 CHECKFLAGS="-D__CHECK_ENDIAN__".  Is it really a fix, or was the
> > > previous code accidentally correct?
> > >
> > > This needs to be tested on different big endian PCs, if possible with
> > > the Apple Uninorth FireWire controller and other types of controllers.
> > > One test which involves ohci->request_generation is simply with an
> > > SBP-2 device (harddisk, CD-ROM...).  Does SBP-2 login etc. work?
> >
> > Works just fine with the Apple UniNorth controller in my powerbook in
> > cursory testing. Tested with multiple sbp2 hard disks, plugging and
> > unplugging, mounting and unmounting, etc.
>
> Which specific rev/version of the uninorth controller ?

lspci says Apple Computer Inc. UniNorth 2 FireWire (rev 81), pci id 106b:0031, 
subsys id 106b:5811.

(Its a circa 2004 Aluminum 15" PowerBook G4 @ 1.67GHz, fwiw).

> There is the "interesting" one has vendorID Apple and deviceID 0x0018,
> the normal ones have different deviceIDs (and are just lucent
> controllers afaik).

Under Mac OS X, system.log says "FireWire (OHCI) Apple ID 31 built-in now 
active". Could still be lucent though, judging by the subsys device ID of 
5811, which matches up w/the Lucent/Agere FW323. But no, apparently I don't 
have the interesting one.


-- 
Jarod Wilson
jwilson@...hat.com
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