Hardware notes

ARM-USB-TINY-H

Low voltage UART mode

Connector pinout

9 5 1
----^^----
/oooooooooo\
\oooooooooo/
----------
6 2

1, 2: Vcc (connected)
4, 6 and the rest of the low row: GND (connected)
5: RX
9: TX

Driver

modprobe ftdi_sio vendor=0x15ba product=0x002a