I'm running Soekris NET4801 doing data collection, it has been running stable for years. Recently I added a USB-serial port running in raw mode at 300/7/EVEN The machine started freezing hard and recovered only when the watchdog kicked in. When frozen, there is no serial console reaction, no packet traffic and no signs of a panic message. I tried two different USB-serial dongles, one UPLCOM and one UFTDI, apart from a possibly slightly different frequency, no difference. Disabling the software on the USB serial port, made the freezes go away. I have now moved the parity check into software, running the port as 300/8/NONE instead, and the problem has not been seen since. Has anybody ever tested a parity error on a USB serial port ?
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