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# rmmod ftdi_sio
# modprobe ftdi_sio
# /usr/local/bin/rfcmd /dev/ttyUSB0 NEXA A 2 0
rfcmd - Error opening /dev/ttyUSB0
#dmesg
...
ftdi_sio ttyUSB0: module get failed, exiting
ftdi_sio ttyUSB0: FTDI USB Serial Device converter now disconnected from ttyUSB0
ftdi_sio 2-2:1.0: device disconnected
drivers/usb/serial/usb-serial.c: USB Serial deregistering driver FTDI USB Serial Device
drivers/usb/serial/usb-serial.c: USB Serial support registered for FTDI USB Serial Device
ftdi_sio 2-2:1.0: FTDI USB Serial Device converter detected
drivers/usb/serial/ftdi_sio.c: Detected FT232RL
usb 2-2: FTDI USB Serial Device converter now attached to ttyUSB0
usbcore: registered new interface driver ftdi_sio
drivers/usb/serial/ftdi_sio.c: v1.4.3:USB FTDI Serial Converters Driver
drivers/usb/serial/ftdi_sio.c: ftdi_set_termios FAILED to set databits/stopbits/parity
drivers/usb/serial/ftdi_sio.c: ftdi_set_termios urb failed to set baudrate
drivers/usb/serial/ftdi_sio.c: update_mctrl Error from MODEM_CTRL urb: DTR HIGH, RTS HIGH
drivers/usb/serial/ftdi_sio.c: urb failed to clear flow control
drivers/usb/serial/ftdi_sio.c: update_mctrl Error from MODEM_CTRL urb: DTR HIGH, RTS HIGH
drivers/usb/serial/ftdi_sio.c: ftdi_open - failed submitting read urb, error -90
#uname -r
2.6.23.1-42.fc8