Problems with the NEM firmware can cause various symptoms, including but not limited to:
System does not boot and displays an fma fault:
Partial or no information in sensor data lists, especially in NEM sensors.
To fix these problems, you must update the NEM expander firmware. For details, refer to Oracle Integrated Lights Out Manager (ILOM) 3.0 Supplement for the Sun Server X2-8 (formerly Sun Fire X4800 M2).