Description
Due to a limitation in the Quartus® Prime software, you may see flashsm_reset reported as an unconstrained clock. This occurs when you instantiate the Parallel Flash Loader (PFL) IP in a MAX® 10 device.
Resolution
Flashsm_reset is not a clock, so it is safe to ignore this warning.
This problem was fixed in Intel® Quartus® software version 19.1
