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$ dmesg | grep FT
[ 3.603690] usb 1-1.3.2: Manufacturer: FTDI
[ 3.608712] usb 1-1.3.2: SerialNumber: FTFDM2IU
[ 5.449131] USB Serial support registered for FTDI USB Serial Device
[ 5.455418] ftdi_sio 1-1.3.2:1.0: FTDI USB Serial Device converter detected
[ 5.725517] usb 1-1.3.2: Detected FT232RL
[ 6.060912] usb 1-1.3.2: FTDI USB Serial Device converter now attached to ttyUSB0
[ 6.136607] ftdi_sio: v1.6.0:USB FTDI Serial Converters Driver
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$ lsusb
...
Bus 001 Device 007: ID 0403:6001 Future Technology Devices International, Ltd FT232 USB-Serial (UART) IC
...
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$ cat /etc/inittab
...
#T0:23:respawn:/sbin/getty -L ttyAMA0 115200 vt100
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$ cat /boot/cmdline.txt
#dwc_otg.lpm_enable=0 console=ttyAMA0,115200 kgdboc=ttyAMA0,115200 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline rootwait
dwc_otg.lpm_enable=0 console=ttyUSB0,115200 kgdboc=ttyUSB0,115200 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline rootwait
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$ echo "test" > /dev/ttyUSB0
What am I doing wrong?