Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series1/EFM32GG12B/EFM32GG12B530F512IL112/CMU/HFBUSPRESC#0x0
PRESC=NODIVISION
High Frequency Bus Clock Prescaler Register
HFBUSCLK Prescaler
0 (NODIVISION): undefined
https://github.com/cmsis-svd/cmsis-svd-data