Messages in this thread | | | Subject | Re: [PATCH 2.6.22.y] ieee1394: revert "sbp2: enforce 32bit DMA mapping" | From | Andi Kleen <> | Date | 07 Aug 2007 04:18:43 +0200 |
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Stefan Richter <stefanr@s5r6.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.
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