ar9170.fw is the GPL firmware for the Atheros 802.11n USB chipset (AR9170).
See also ar9170 – the respective upstream driver.
Get the source
You can get the source code from:
You will need an SH2 toolchain, you can download the GNU GCC toolchain, gnush from KPIT:
Build and install
make sudo make install
This firmware should get you connected with 802.11n networks and with networks requiring encryptions. At this point the firmware just works but could use enhancements.
Patches should be sent to the linux-wireless mailing list.