I just used Xilinx Chipscope with EDK for the first time and it is great!
Just drap and drop chipscope_icon and chipscope_plb_iba in XPS and connect them together. Then recompile and you have a non-intrusive plb bus analyzer.
One problem I had was Chipscope didn't want to work with the evaluation version of ISE.
In the file chipscope_plb_iba_v1_01_a/data/chipscope_plb_iba_v2_1_0.tcl I had to change: exec xst -ifn $xst_scr_filename to: exec xst -ifn $xst_scr_filename 2> null so the warning about the evaluation version expiring doesn't cause the compile to fail.
I also had a problem with my Zone Alarm firewall because Chipscope sets up a client/server connection so it can be used remotely.
EDK 8.1.02, ISE 8.1.03, Chipscope 8.1.03