Hi,
during the boot process, I’ve found these messages related to a purported array of USB-to-UART devices:
mixtile@ClusterBox:~$ sudo dmesg | grep usb | tail
[ 3.753551] usb_ch343 1-1:1.0: ttyCH343USB0: usb to uart device
[ 3.811887] usb_ch343 1-1:1.2: ttyCH343USB1: usb to uart device
[ 3.823701] usb_ch343 1-1:1.4: ttyCH343USB2: usb to uart device
[ 3.851671] usb_ch343 1-1:1.6: ttyCH343USB3: usb to uart device
As I have no RS232 dongle attached to the USB port of the control board, I wonder which devices are in fact mentioned here: The internal 3-pin UART header maybe?