When using the Tri-Mode Ethernet MAC v5.5 example design in Vivado 2012.4 on a Windows machine, the core level XDC file is not properly loaded when opening the implemented design.
Critical warnings similar to the following are received:
The XDC constraints are not properly loaded for running Timing Reports.
This can be worked around by manually loading the XDC file after the implemented design is opened:
read_xdc -cells trimac_fifo_block/trimac_block/inst C:/path_to_project/example_project/core_name_example/core_name_example.srcs/sources_1/ip/core_name/synth/core_name.xdc