Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series1/EFM32GG12B/EFM32GG12B410F1024IL112/QSPI0/FLASHCMDADDR#0x0
Flash Command Address Register (STIG)
Command Address
https://github.com/cmsis-svd/cmsis-svd-data