https://docs.silabs.com/wisun/2.9.2/bootloader-user-guide-gsdk-4/10-gecko-bootloader-and-trustzone
10 Gecko Bootloader And Trustzone | Silicon Labs Gecko Bootloader User's Guide for GSDK 4.0 and...
Silicon Labs Gecko Bootloader User's Guide for GSDK 4.0 and Higher - 10 Gecko Bootloader And Trustzone in Wi-SUN (v2.9.2) | Silicon Labs Docs