MediaTek IOMMU Version 1 (M4U gen1) Support

modulename: mtk_iommu_v1.ko

configname: CONFIG_MTK_IOMMU_V1

Linux Kernel Configuration
└─>Device Drivers
└─>IOMMU Hardware Support
└─>MediaTek IOMMU Version 1 (M4U gen1) Support
In linux kernel since version 3.10 (release Date: 2013-06-30)  
Support for the M4U on certain Mediatek SoCs. M4U generation 1 HW is
Multimedia Memory Managememt Unit. This option enables remapping of
DMA memory accesses for the multimedia subsystem.

if unsure, say N here.

source code: