Warning: Cannot link cell 'spartan2_primitives/u1' to its reference design 'startup_spartan2'. (FPGA-LINK-2) Warning: Cannot link cell 'spartan2_primitives/u2' to its reference design 'bscan_spartan2'. (FPGA-LINK-2) Warning: Cannot link cell 'spartan2_primitives/u3' to its reference design 'capture_spartan2'. (FPGA-LINK-2) Warning: The cell '/spartan2_primitives/u1' is not linked to any design. (FPGA-CHECK-4) Warning: The cell '/spartan2_primitives/u2' is not linked to any design. (FPGA-CHECK-4) Warning: The cell '/spartan2_primitives/u3' is not linked to any design. (FPGA-CHECK-4)