DMA Engine support for RapidIO


Linux Kernel Configuration
└─>Device Drivers
└─>RapidIO support
└─>DMA Engine support for RapidIO
In linux kernel since version 3.10 (release Date: 2013-06-30)  
Say Y here if you want to use DMA Engine frameork for RapidIO data
transfers to/from target RIO devices. RapidIO uses NREAD and
NWRITE (NWRITE_R, SWRITE) requests to transfer data between local
memory and memory on remote target device. You need a DMA controller
capable to perform data transfers to/from RapidIO.

If you are unsure about this, say Y here.