Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series1/EFM32GG12B/EFM32GG12B810F1024GM64/SDIO/ROUTELOC1#0x0
CMDLOC=LOC0
I/O LOCATION Register
I/O Location for CMD Pin
0 (LOC0): Location 0
1 (LOC1): Location 1
https://github.com/cmsis-svd/cmsis-svd-data