【Serial Card】EMP2 Serial Card Linux driver loading fail, how to trouble shooting it?

Some Linux such as Fedora include UART 8250 driver natively, it will replace EMP2 driver forcedly, you must disable 8250 driver for using EMP2 driver.

Please refer to the below steps to disable 8250 driver.

Step1: Modify grub setting

sudo nano /etc/default/grub

Step2: Add setting

Add “8250.nr_uarts=0” in GRUB_CMDLINE_LINUX_DEFAULT=

Step3: Active new grub setting

Fedora: grub2-mkconfig -o /boot/grub2/grub.cfg

ubuntu: update-grub

Step4: Reboot and check nr_uarts = “0”

systool -v -m 8250