linux-kernel - Re: [PATCH] firewire: Enable physical DMA above 4GB

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Message-ID: <20130326213532.38a7bd4c@stein>
Date:	Tue, 26 Mar 2013 21:35:32 +0100
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	Peter Hurley <peter@...leysoftware.com>
Cc:	linux1394-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, Clemens Ladisch <clemens@...isch.de>
Subject: Re: [PATCH] firewire: Enable physical DMA above 4GB

On Mar 26 Peter Hurley wrote:
> On Tue, 2013-03-26 at 19:56 +0100, Stefan Richter wrote:
> > It has been a long time though since I last checked whether PhyUpperBound
> > is implemented; maybe it has become more widespread than it was back then.
> > 
> > Or maybe it hasn't:  All OHCI-1394 chips that ever came to market are 32
> > bit chips anyway.  So the few rare ones that do support PhyUpperBound
> > larger than 4 GB cannot in fact use it.
> > 
> > Or am I severely behind the times about this?
> 
> The FW643e-2 is natively PCIe (not behind a bridge) and supports phys
> DMA past 4GB (the datasheet says all 48 bits but I can only test it out
> to 10GB).
> 
> I thought the FW643e was as well? You'll have to test that out :)

OK, will do.
-- 
Stefan Richter
-=====-===-= --== ==-=-
http://arcgraph.de/sr/
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