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

[Stefan Richter]

Benjamin Herrenschmidt wrote:
>>> If setting 32-bit DMA mask fails on ppc64, that sounds like a problem
>>> with the DMA implementation on that architecture. There are enough cards
>>> out there that only support 32-bit DMA that this really needs to work..
>> Yes, could the PPC folks please have a look at it?  Thanks.
> 
> Smells like we may have a bug there. No worries though, all current PPC
> machines have an iommu that will not give out addresses above 32 bits
> anyway, but I'll double check what's up.
> 
> Do you see something in dmesg when that happens ?

There was nothing in Olaf's report, except for trouble in sbp2 _after_
the failure.  http://lkml.org/lkml/2007/8/1/344  (I don't have a PMac.)
-- 
Stefan Richter
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