Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32f2/STM32F217/Ethernet_MAC/MACA2HR#0x0
Ethernet MAC address 2 high register
MAC address2 high
Mask byte control
Source address
Address enable
https://github.com/modm-io/cmsis-svd-stm32