Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Fujitsu/MB9BF61xT/ETHERNET_MAC0/GAR#0x0
GMII/MII Address Register
GMII/MII Busy
GMII/MII Write
Application Clock Range
GMII Register
Physical Layer Address
https://github.com/cmsis-svd/cmsis-svd-data