When I add a GT11 to a partition, I receive errors similar to the following:
ERROR:LIT:355 - GT11 symbol "serdes_out_01/GT11_CUSTOM_INST" (output
signal=serdes_out_01/RXCOMMADET_OUT) output ports RXMCLK, RXPCSHCLKOUT, or
TXPCSHCLKOUT can not drive OBUF, OBUFTDS, or OBUFDS.
ERROR:LIT:436 - RXPCSHCLKOUT / TXPCSHCLKOUT pins of GT11 symbol
"serdes_out_01/GT11_CUSTOM_INST" (output signal=serdes_out_01/RXCOMMADET_OUT)
are reserved and cannot be connected to active signals.
Partition boundaries prevent optimizations across boundaries. This is preventing the correct optimization from occurring across the boundaries and causes problems when a GT11 is used in a partition.
To work around these errors, do not place the GT11 in a partition.