This is an info from Embwise:
We have the Socket P500 CF-WLAN Linux driver tested and validated on the 
Zaurus SL-C3000 PDA,apart from other Host processor Development 
hardware.However,the driver is not opensource and we are authorized to 
provide the driver only in Binary.We license the binary driver to 
customers.We ofcourse can do the build for any Linux kernel 
versions/releases and test,before we ship the driver.
URL: 
http://www.embwise.com