Atheros 3k (AR3011) kernel extension for Mac OS X - firmware upload.
Currently known to work on: Snow Leopard (10.6.8), Lion, Mountain Lion, Mavericks, Yosemite, and possibly future OS X.
Current downloads:
https://bitbucket.org/RehabMan/os-x-atheros-3k-firmware/downloads/
Old/Archived downloads:
https://code.google.com/p/os-x-atheros-3k-firmware/downloads/list