PCIe sg dma device used as dma-contig

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Hello,

The following question is not totally in the scope of v4l2, but more
about your advise concering dma alternatives for non-expreciened v4l2
device writer.
We intend to use the fpga for concurrent 3xHD and 3xSD.

We have some dillema regadring the fpga to choose from:
ALTERA fpga which use contiguous dma memory, or Xilinx fpga which is
using scatter-gather architecture.

With xilinx, it seems that the sg architecture can also be used as
contiguous according to the following:
"... While these descriptors are not required to be contiguous, they
should be contained within an 8 megabyte region which corresponds to
the width of the AXI_PCIe_SG port"
it seems according to the above description that sg-list can be used
as single contiguous descriptor (with dma-cotig), though the 8MBytes
seems like a problematic constrain. This constrain make it difficult
to be used with dma-contig solution in v4l2.

Our current direction is try to imeplement it as simple as possible.
Therefore we prefer the dma contiguous solution (I think that together
with CMA and a strong cpu like 64-bit i7 it can handle contigious
memory for 3xHD and 3xSD allocation).

Any feedback is appreciated,
Ran
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