@th@social.v.st
And after sending a efm32s3_dci_device_erase command, I can debug the chip. So thanks for the $5 dev board with boost converter, Ikea, even if we have to start from zero for the firmware.
@th@social.v.st
I can flash the EFR32MG24 once with a program, but have to do the full dci device erase after each one and then power cycle to get the write commands to work again. But at least I have proof of life from gdb talking to openocd.