Hi Experts,

Are UARTs available on Apollo Lake different than traditional 8250 UART? Or any specific settings (jumper etc) required to use them?

Problem Statement:

I am using UART available (through micro USB port) on Leafhill CRB. I am able to get coreboot logs but grub fails to detect these uart.

I have following in my grub2.cfg

serial --speed=115200 --unit=0 --word=8 --parity=no --stop=1

Grub output an error

serial port COM0 not found

If I change --unit=0 to 1 or 2 grub2 reports similar error

serial port COM1 not found

serial port COM2 not found