Hi,
FlexRay requires a minimum of 2 nodes to be able to be a valid network. Similar to CANBus, you cannot have a 1 node network, it will issue an Error (unless using internal loopback features).
As for RDB2, we understand that they have the available HW, but the example was not built for RDB2, but for EVB, as shown under the description.txt file:

That is why the comment "FlexRay could not be tested on RBD2, the hardware did not connect to PHY". If we see under the RDB2 schematic, the pins do not correspond with the example.
Please, let us know.