After disabling NAK holdoff it works perfect at 3 Mbaud.

Thank you!

Thanks for your reply. at that speed, what's wrong with ethernet? Recieving side works with serial signal, that's the reqirement. is the bottleneck the UART or the rate at which you can "cat *" does ( while true ; do cat /etc/hosts ; done ) >> /dev/ttyUSB0 go any faster (i.e. the same file over and ...

Hi Forum. I'm trying to establish a high speed UART communication. Since ttyAMA0 is not quite good at 1+ Mbaud, decided to use FTDI adapter (based on FT232RL chip) instead. I've tested an adapter on my laptop running Debian 8 and reached stable transmission speed at 3 Mbaud (with a cat * >> /dev/tty...