I just put together my first CM3/CM3L carrier PCB. I'm having an issue getting it to boot correctly. Heres a video of the boot LED, it doesnt appear to match the LED on the RPI carrier PCB. In addition, I see no activity on the USB bus. On the RPI IO pcb I see activity immediately.
I corrected a few issues with the board, stupid mistakes of course... The 1.8V regulator appears to not be able to handle the load on it, I bypassed it, and connected it directly to my bench supply. I power up my PCB with 24V, it creates 3.3V for 3V3/VBAT and it creates 5V for USB Host. I then manually enable the 1.8V on the supply. Could this significant delay be an issue?
The only other issue I can find is that GPIO28,29 do not have pull-ups/pull downs on them. I am planning on adding this today when I get to the hardware. Could this cause the failure?
I can post a schematic later on today if it would help.