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

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Date:	Sat, 1 Mar 2008 13:36:05 +0100 (CET)
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	linux1394-devel@...ts.sourceforge.net
cc:	Harvey Harrison <harvey.harrison@...il.com>,
	Sam Ravnborg <sam@...nborg.org>, linux-kernel@...r.kernel.org,
	sparclinux@...r.kernel.org, linuxppc-dev@...abs.org,
	Kristian Hoegsberg <krh@...planet.net>,
	Jarod Wilson <jwilson@...hat.com>
Subject: Re: [PATCH 1/2] firewire: endianess fix

On 23 Feb, I wrote:
>> This needs to be tested on different big endian PCs, if possible with
>> the Apple Uninorth FireWire controller and other types of controllers.

I tested it myself now with VT6306 on PPC32.

> it should be triggered by replacing
> 	&fw_high_memory_region
> by
> 	&fw_private_region
> in drivers/firewire/fw-sbp2.c and testing with any SBP-2 device

This indeed demonstrates the fix.  Any IO to SBP-2 devices fails with
timeouts.  Just removing the posted write enable bit in fw-ohci wasn't
sufficient to catch it though.  Maybe the controller has write posting
enabled by default.

However, this endianess bug was low-profile because there are currently
no kernelspace or userspace drivers for the firewire stack which need to
respond in split transactions.
-- 
Stefan Richter
-=====-==--- --== ----=
http://arcgraph.de/sr/

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