RE: [PATCH 1/2] misc: add CARMA DATA-FPGA Access Driver

[David Laight]

> This driver allows userspace to access the data processing 
> FPGAs on the OVRO CARMA board. It has two modes of operation:
> 
> 1) random access
> 
> This allows users to poke any DATA-FPGA registers by using mmap to map
> the address region directly into their memory map.

I needed something similar, but used pread() and pwrite()
to request the transfers.
While this does require a system call per transfer, it allows
the driver to use dma (if available) to speed up the request.
In my case doing single cycle transfers would be too slow.

	David


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