ID:186503 GXB receiver channel <name> is in post 8B/10B loopback mode. This is illegal.
CAUSE: The specified gigabit transceiver block (GXB) receiver channel is in post 8B/10B loopback mode. This is illegal.
ACTION: Modify the design so that the specified GXB receiver channel is not using post 8B/10B loopback mode.