Option serial is ambiguous

eduardosilva · Oct 29, 2014

Hello,

I'm trying to add a serial port (usb adapter) to a KVM Guest (pve 3.3)

Code:

# qm set 100 -serial /dev/ttyUSB0 
Option serial is ambiguous (serial0, serial1, serial2, serial3)
400 unable to parse option

Any ideas or suggestions?

Thank you

eduardosilva · Oct 29, 2014

Just as an update,

Maybe the problem is related to the name /dev/ttyUSB0?

I manually added

Code:

args: -serial /dev/ttyUSB0

to 100.conf and after powering off/on the Serial port was correctly mapped

Thanks

dietmar · Oct 30, 2014

Simply use:

# qm set 100 -serial0 /dev/ttyUSB0

eduardosilva · Oct 30, 2014

Cheers dietmar,

dietmar said:
Simply use:

# qm set 100 -serial0 /dev/ttyUSB0

I've tried that before posting, also didn't worked. The error is a bit different

Code:

# qm set 100 -serial0 /dev/ttyUSB0
400 Parameter verification failed.
serial0: value does not match the regex pattern
qm set <vmid> [OPTIONS]

Same issue with 1,2 and 3

Hand editing the vm conf file did the trick.

Maybe qm set is expecting for a device like /dev/ttyS[0-9] ?

Thank you

dietmar · Oct 31, 2014

eduardosilva said:
Maybe qm set is expecting for a device like /dev/ttyS[0-9] ?

yes. What exactly is ttyUSB0?

linum · Oct 31, 2014

ttyUSBx devices are usally RS-232 <-> USB converters like this one: http://www.ftdichip.com/Products/Cables/USBRS232.htm

BTW: I had the same problem a few days back. And maybe it makes sense to allow devices like /dev/ptyX (as used by many examples like this http://www.dest-unreach.org/socat/doc/socat-ttyovertcp.txt) as well.