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.