Hi Martin, On Tue, Jan 2, 2018 at 2:15 PM, Martin Kaiser <martin@xxxxxxxxx> wrote: > I tested on an imx258. I am not able to reproduce this problem on a imx25 pdk running 4.14.11 or linux-next. Is it 100% reproducible on your board? Care to share its dts? Do you use multiple UART ports? Do any of them use RTS/CTS? Do you have any logs to share? Thanks