hello alexeypcmls4,
FYI,
please have below two different approaches for your testing.
-
we had verified that serial data is being transferred properly without any data loss with execute getty running at background,
for example, on Jetson-Nano.
$ sudo /sbin/getty -a ubuntu -L 115200 ttyTHS & -
Or, please stop stop the nvgetty service for verification.
$ systemctl stop nvgetty
$ systemctl disable nvgetty