Messages in this thread | | | From | Anthony Truong <> | Subject | pci_set_dma_mask() on masks other than 0xffffffff (32-bit systems ) | Date | Thu, 14 Aug 2003 02:08:49 -0700 |
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Hello, Isn't this another reason for having the (controlled) bigphysarea into the mainstream? If our DMA devices are capable of handling only sub 32-bit DMA memory, then they are limited to the first 16 MB set aside for GFP_DMA? So if we need more than 16 MB or if there is not enough left in this tiny region, then we are finished :-( Even when blessed with SG capable DMA engines, we have to make sure the DMA processor capable of handling the worst-case scenario. Like for a 4 MB buffer, it has to be able to fetch 1001 entry SG table. Or maybe it's time to throw away all old and substandard HW. Why do we need to support them? :-(
Regards, Anthony Dominic Truong.
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