ATA BMDMA support

configname: CONFIG_ATA_BMDMA

Linux Kernel Configuration
└─>Device Drivers
└─>Serial ATA and Parallel ATA drivers (libata)
└─>ATA BMDMA support
In linux kernel since version 2.6.35 (release Date: 2010-08-01)  
This option adds support for SFF ATA controllers with BMDMA
capability. BMDMA stands for bus-master DMA and is the
de facto DMA interface for SFF controllers.

If unsure, say Y.