again I don't know what i am doing, but for the fun of it I tried: modprobe on the Galileo and it did:
root@clanton:~# modprobe cdc-acm
[ 4201.452920] cdc_acm 1-1:1.0: ttyACM0: USB ACM device
[ 4201.476560] usbcore: registered new interface driver cdc_acm
[ 4201.482361] cdc_acm: USB Abstract Control Model driver for USB modems and ISDN adapters
and when I tried the udevadm It showed:
root@clanton:~# udevadm info --query=property --name=ttyACM0
DEVNAME=/dev/ttyACM0
DEVPATH=/devices/pci0000:00/0000:00:14.4/usb1/1-1/1-1:1.0/tty/ttyACM0
MAJOR=166
MINOR=0
SUBSYSTEM=tty
Which looks closer. If I now unplug it and replug it in, it again shows ttyACM0... So I think that is one hint... Not sure yet what modprobe does...