Joan,
Concerto doesn't have an ETM (directed to ETB or pins). As far as I know the only trace it has is ITM. For Concerto the ITM data goes over the trace port instead of SWO so it requires an XDS560v2 to capture. There is more information here: http://processors.wiki.ti.com/index.php/Cortex_M3_ITM_Support_for_Concerto_F28M35x
What is the file you found that refers to ETB setup for these devices? I would like to chase that down.
Regards,
John