ID:18556 Read-only destination "<src>.<port>" was not flagged as a global destination in a previous compile but is driven by a clock buffer.

CAUSE: The destination was not routed to globally in a previous compile. In the current compile, the destination must use core clock network routing, but the destination is read-only.

ACTION: The read-only partition needs to be recompiled with the destination routed globally, or the source clock buffer should be disconnected from the destination.