The status of the BCM ethernet chip
BCRAM(0) bit 2^0 - Buffer control RAM (only in BCM5380M)
IPDBM(1) bit 2^1 - Internal packet data buffer memory
MRAM(2) bit 2^2 - MIB RAM (only in BCM5380M)
GMRAM(3) bit 2^3 - Gigabit MIB RAM (only in BCM5380M)
If the bit is set, then that sub-system has failed.