On CodeWarrior, using the Debug Configurations-> ‘Trace and profile’, you can see which cores you can debug.
For further information we have a document called “Enabling DAP on QorIQ LS1028A Processor”, Please note that this document is only provided if there is an active NDA.
I highly recommend you to put a new ticket asking for an NDA to obtain that document.
Best Regards,
Hector Villarruel