If your EVB with OpenSDA debugger can't start debug session - you can try to update OpenSDA firmware on your board.
- Go to PE Micro web pages - http://www.pemicro.com/opensda/ and get the latest firmware archive.
- Extract .SDA file related to your EVB - for example
DEBUG-OPENSDA-E200_Pemicro_v110.SDA for DEVKIT-MPC5748G
MSD-DEBUG-EVB-S32K144_Pemicro_v119.SDA for S32K144EVB
- Press and hold SW3 (Reset for S32K144EVB) button and connect OpenSDA connector on EVB to PC. New BOOTLOADER Drive should appear on your PC.
- Copy .SDA file in BOOTLOADER drive
- Reset EVB.
More details you can find in "Updating the OpenSDA Firmware.pdf" file. It is part of downloaded zip file from PE Micro web pages.