From: eLinux.org
wpa_supplicant-0.5.5 is known to work properly with libertas sdio
the marvell supplied firmware for 8.73.7 is known to work with all current versions of the libertas driver
http://www.marvell.com/drivers/driverDisplay.do?driverId=178
the marvell supplied firmware for 9.70.3 is known to work with libertas driver in the main linux kernel starting at 2.6.27
http://www.marvell.com/drivers/driverDisplay.do?driverId=203 (dead)
http://extranet.marvell.com/drivers/driverDisplay.do?driverId=203