Latest Sony Phone with accessible UART Port?

[hanz]

Hi,
since your open devices provide (at least some of them) an accessible UART port.
Is it only the RX part of the connection or would i be able to interact with the system?
If yes, what is the latest Sony device with >= android 11 and accessible UART port?
I would like to use the UART for KGDB

Thanks for your replies,
Hannes

[hanz]

so i got an older sony xperia where you provide the uart points, soldered it on and works but i only get the bootloader output. how can i make the uart output available in android? i want to build a custom kernel and set the uart output via cmdline parameter to connect to kgdb is uart exportet as a device in /dev/ or is there no driver support available?