Hi While playing around with on old SBC with an 16C950 UART I noticed that it does not work properly. After investigating I found out that it is not running with Hardware Flow Control enabled. It is a simple patch which only affects the 16C950. https://github.com/torvalds/linux/compare/master...denis2342:patch-1 Sadly I would not know anybody other than me to test this. Denis Ahrens