RPI3B+ does not reboot

[Wis Macomson]

Can you disconnect the serial TX data (data to the RPi) and try the reboots?

It may be that this signal is partially powering the processor through the input ESD protection diode, leading to very awkward internal states. This has been observed on the Rock64 (RK3328 SoC) and Rockpro64 (RK3399).

If you can just break the TX connection, you'll be able to see the boot messages.

-wis


Wis Macomson, Signal Integrity Engineer
Oregon, Teraspeed Home Office
Office: 541-393-8023 
www.samtec.com