Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series1/EFM32GG12B/EFM32GG12B530F512IL120/MSC/ECCCTRL#0x0
RAM ECC Control Register
RAM ECC Write Enable
RAM ECC Check Enable
RAM1 ECC Write Enable
RAM1 ECC Check Enable
RAM2 ECC Write Enable
RAM2 ECC Check Enable
https://github.com/cmsis-svd/cmsis-svd-data