May be instead of serial@01c28800 - serial2 ?

Problem is still unsolved.
After enabling ttyS2 via npi-config we can see ttyS2 all reasonable configuration is /proc and /sys - perfect, but still not working

P.S. It's 100% software problem. ttyS2 is woking with kernel 3.4 and not with kernel 4.11.2 on the same hardware.

The /dev/ttyS3 - exists,
SPI - stopped via /boot/script.bin,
but bytes do not really come to output pin.
What could we fix to start it to work?