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

Stefan Richter [off-list ref] 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