Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series1/EFM32GG12B/EFM32GG12B410F1024GM64/ETM/ETMDEVTYPE#0x0
CoreSight Device Type Register
Trace Source
Processor Trace
https://github.com/cmsis-svd/cmsis-svd-data