NTB Debugging Tool Test Client

modulename: ntb_tool.ko

configname: CONFIG_NTB_TOOL

Linux Kernel Configuration
└─>Device Drivers
└─>Non-Transparent Bridge support
└─>NTB Debugging Tool Test Client
In linux kernel since version 4.1 (release Date: 2015-06-21)  
This is a simple debugging driver that enables the doorbell and
scratchpad registers to be read and written from the debugfs. This
enables more complicated debugging to be scripted from user space.
This driver may be used to test that your ntb hardware and drivers are
functioning at a basic level.

If unsure, say N.

source code: