FX30: How to see LK serial console debug messages?


Hello everyone,

I would like to be able to see FX30 boot log messages starting from LK (Little Kernel used as bootloader) then Linux serial console output for debugging boot initialization issues. Does anyone know which serial link or testpoints I should use and what is the serial link configuration (speed, SS bits, …) ?

Is this even possible on FX30 platform ?

Thanking you in advance for your support,
Best regards,


Hi Gautier, are you able to obtain an FX30S? That would be easiest to route the linux console to the serial port.


Hi Chris,

Thank you for your answer, I don’t have any FX30S available, do you think I could use the IoT expansion port or any test points?

Kind regards,



Hi Gautier,
Yes, you could use the IOT card slot with UART2, so you’d have to set AT!MAPUART=16,2 and then reboot.


Hi Chris,
Thank you for this hint, I’ll try to test this next week.
Have a nice weekend,