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What:		/sys/bus/platform/devices/dfl-port.0/id
Date:		June 2018
KernelVersion:	4.19
Contact:	Wu Hao <hao.wu@intel.com>
Description:	Read-only. It returns id of this port. One DFL FPGA device
		may have more than one port. Userspace could use this id to
		distinguish different ports under same FPGA device.

What:		/sys/bus/platform/devices/dfl-port.0/afu_id
Date:		June 2018
KernelVersion:	4.19
Contact:	Wu Hao <hao.wu@intel.com>
Description:	Read-only. User can program different PR bitstreams to FPGA
		Accelerator Function Unit (AFU) for different functions. It
		returns uuid which could be used to identify which PR bitstream
		is programmed in this AFU.