Description xnfprep v5.2.1 on workstation gives a segmentation fault and a core dump. The design contains a dual port RAM RAM16x1D.
This is a bug in the XACT 5.2.1 software, it will be fixed in future revisions. Check to see if the SPO pin is unconnected. If unconnected, try to connect it somewhere in the design, where it cannot be optimized away, for example an unused obuf-opad.