Troubleshooting • Re: BOOT_UART=1 but no serial data

Which connector and pins on the Pi5 are you plugging that USB UART into? The 40 pin GPIO header or the dedicated debug UART header?

I grabbed the 40-pin Du-Pont style shell for the GPIO connector, totally missed the new debug port.

Boot loader serial output goes to the debug header by default on a Pi5. Even without BOOT_UART=1.

By default, does that imply it can be changed? Seems like it can't, so I'll have to get some JST SH connectors or a micro hdmi adapter to find out whats going on.

Thanks for pointing me in the right direction at least!

Statistics: Posted by bearer — Sat Nov 08, 2025 11:57 pm

---