According to a post on the OpenWrt.org forums, a new open source driver for the Marvell-based chipset has arrived. This information comes from greymattr who reports:
We received the official open source wireless driver this week. We will be working to get it integrated into the trunk in the coming days. The ipk package was created and posted for those who wish to use it, but we are still very committed releasing a version that can be recompiled by users. For those users with reservations about using a pre-compiled component, I would recommend waiting just a bit longer for the open source version. Once we have done some spot checks on the driver, I will see if I can get approval to post it as well ( no promises ).
The forum post author greymattr is reportedly Matthew Fatheree, a developer at Belkin, so although this new development is unofficial it is very promising!
A binary commit of the driver has also been committed to Github:by