【Serial Card】EMP2 serial card Linux driver fails to load. How can I troubleshoot this?

Some Linux distributions (such as Fedora) include a built-in UART 8250 driver, which may forcibly override the EMP2 driver. To ensure the EMP2 driver functions correctly, you need to disable the 8250 driver. Please follow the steps below:

Step 1: Modify the GRUB configuration

sudo nano / etc / default / grub

Step 2: Add the following setting

Add “8250.nr_uarts=0” in GRUB_CMDLINE_LINUX_DEFAULT=

Step 3: Apply the new GRUB configuration

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

ubuntu: update-grub

Step 4: Reboot and verify the settings
After rebooting, run the following command to check if nr_uarts = "0": 

systool -v -m 8250