ID:20619 Global signal "<signal name>" with no physical fanout is not routed.

CAUSE: The specified global signal has no phsyical fanout and as a result, the global signal is not routed. This condition can occur, for example, when the global signal only drives the ports on partitions and remains unused otherwise.

ACTION: No action is required. To route the signal and avoid this warning, add physical fanout to the specified global signal.