linux-kernel - Re: [PATCH 2.6.22.y] ieee1394: revert "sbp2: enforce 32bit DMA mapping"

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Date:	07 Aug 2007 04:18:43 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Stefan Richter <stefanr@...6.in-berlin.de>
Cc:	Robert Hancock <hancockr@...w.ca>, linuxppc-dev@...abs.org,
	stable@...nel.org, linux-kernel@...r.kernel.org,
	Olaf Hering <olh@...e.de>
Subject: Re: [PATCH 2.6.22.y] ieee1394: revert "sbp2: enforce 32bit	DMA	mapping"

Stefan Richter <stefanr@...6.in-berlin.de> writes:
> 
>   1.) The ieee1394 subsystem is known to work on x86_64 with more than 4
> GB RAM, 

It's actually ~3+GB where memory above the 4GB barrier starts appearing.
In some extreme cases even for 2+GB. 

> so I gather that architecture code already sets a proper DMA
> mask for all those 32bit PCI OHCI-1394 implementations out there.

If you don't set a DMA mask then the default is always 4GB.

-Andi
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