The Serial RapidIO core, when generated with a Full Hardware Evaluation license, will not indicate the link can send data because it will not assert "lnk_trdy_n" from the PHY. This can happen both in simulation and in hardware.
Solution
A patch is available for the Serial RapidIO v5.1 core to fix this issue. See (Xilinx Answer 31573) for details.
Revision History
10/31/2008 - Initial Release 11/11/2008 - Updated AR with patch information