Arthur,
I have an OMAPL138 board from Logic and CCSv6.0.0. This is what I did to enable ETB.
In my target configuration (ccxml) file I have the device/board specified as EXPKITOMAPL138 and I have the connection set to my XDS560v2 emulator.
I then launch the debug session. It auto runs to main
Go to Tools -> Hardware Trace Analyzer -> PC Trace
It should be automatically setup to use ETB so I hit start. This will take a few seconds to setup PC trace.
Then I run the program. When I halt it I get the trace data displayed.