Hi, > I have Centos 7 arm32 running on a Cubieboard and I am logged in as root > on its serial uart from another system. > > On that system I use > > screen /dev/ttyUSB0 115200 > > Well it was working well for a couple days, but now only garbage comes > across. Something messed up the serial link. > > pulling the usb cable to the usb/serial adapter does not reset things. > > I can ssh into the server and see root logged into ttyS0 > > How do I reset that serial port so that I can work on the system? I don't know how you can handle the wedged connection. But, I think you troubles may come from the settings used. 115200 baud can be too fast to run for a long time without errors. Also, I don't know how the default handshaking is configured but maybe you have to add such settings as well. Maybe something like "screen /dev/ttyUSB0 19200,ixoff,ixon" would work? Regards, Simon