I could not find any information out there specific to the IO board and UART.
I assumed you just connect the debug probe to the 40-pin GPIO.
I am getting nothing.
Just another - slightly surprised and frustrated - user here, not speaking on behalf of RP Ltd.
I think your debugging attempts are being impeded by these combined issues -
1. On an RPi[5] board there is a separate debug header, not part of the 2x20-way header. The CM5 module similarly has no debug header of its own but the Datasheet lists Test Points and details of the places on the pinout where the debug uart is presented for connection.
2. The Raspberry Pi CM5 IO Board does not appear to have 'mapped' the debug uart pins on the CM5 to any physical connection on the IO Board.
3. (I assume that.. ) the CM5 firmware works in the same way as the RPi[5] from which it is derived and routes debug output to the unconnected debug console on the CM5.
I completely understand why there is no console uart debug header on a 'production' device like the CM5 module itself. The omission of a debug uart header from the 'exemplar' IO Board seems an oversight.
Investigating to what extent the CM5 firmware can be configured to present some level of debug output on one of the UARTs available on the 2x20-way header on the IO Board is on my 'to do' list.
Statistics: Posted by B.Goode — Wed Feb 26, 2025 8:49 am