I tried to flash EFR32MG12P Starter Kit dev board with the on-board integrated SEGGER JLink. However, it seems not work now and the connection to JLink always fails.
I checked the SEGGER JLink supported device name list from here, for EFR32MG12P, it should be "EFR32MG12PxxxF1024". However, when I try to connect to the JLink, it seems not work using that setting file, the detailed info as below. But the "EFR32MG1PxxxF256" allows to connect to JLink.
You are using an old version of the SEGGER JLink tools.
The current version is 6.14c. Please upgrade.
We upgrade the JLinkARM.dll included with Simplicity Studio from release to release, which is why your Studio screenshot shows proper identification of the device as EFR32MG12. It includes a more recent version of JLinkARM.dll than the one you are trying to use with the GDB Server in the SEGGER package.
Yes, the latest GDB Server 6.14v works now. Thanks for this confirmation.