Are you having issues with the Ethernet controller on the RA6 MCU family? This blog suggests that you should check the configuration of the Arm® TrustZone® boundaries and explains why.
The Renesas RZ/G2M platform is the first RZ/MPU platform to be officially certified by Arm as compliant with SystemReady IR 1.1, a set of interoperability specifications targeting edge and IoT devices.