The S32R274 manual section 61.1.1 Register access states that :
The ENET registers cannot be accessed in user mode until at least one supervisor-mode access is made to the ENET module.
What is a supervisor mode and what is a user mode? are they DRUN and RUN0-RUN3 that are configured via Mode Control Registers? Are they something else? Is there code sample on how to change between the modes?