Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/STMicroelectronics/STM32H7x5_CM7/MDIOS/MDIOS_WRFR#0x0
MDIOS write flag register
Write flags for MDIO registers 0 to 31
https://github.com/cmsis-svd/cmsis-svd-data