Enable Uart on raspberry pi 4 Ubuntu core 22

[majidkakavandi]

Hey guys. I want to enable uart on raspberry pi ubuntu core 22. I test this link to do it but it does not work for me:

Accessing ttyS0 on Raspberry Pi 3 running Ubuntu Core

I am running Ubuntu Core on a Raspberry pi 3. I would like to access a device using the serial port and believe this should be available at /dev/ttyS0. However there is no communication at the moment there. From reading some other postings, it seems like the serial port is not enabled by default on the Raspberry Pi3 and in non Ubuntu Core systems the file /boot/config.txt should be edited. Is there an equivalent step to be taken for Ubuntu Core to get this working? I don’t seem to have any ga…

I can’t find cmdline.txt and config.txt in /boot/uboot and I cant create a new file on /boot/uboot because the file system is read-only. thanks for guiding me.

[majidkakavandi]

I solve it. In ubuntu core 22, config.txt and cmdline.txt files moved to /run/mnt/ubuntu-seed/