Hello,
returning to our discussion on incorrect handling of CTSb used as
"driver enable" by SERIAL_IMX driver in RS485 mode, I've made the fix I
was able to, ie. the simple one with just keeping the receiver of the
UART on. Eventually this got tested in action and worked fine.
The kernel I used is a version of ancient 4.14.39, possibly with some
vendor-specific patches. I tried to compare it with the most recent
long-term 4.14.81, but there are changes which I can't interpret without
deeper studies (however, it seems to me that the original problem would
still be present). Newer kernels have even more differences.
If such fix could be useful, and somebody feels like undertaking the
effort to implement it in a proper way, the fix can be found under this
address (along with a short description):
http://arf.net.pl/iMX6/RS485fix.html
Best regards,
Adam
