With palmtx being slowly moved towards mainline, I gave a try to libertas driver. With little tweak, I was able to create ad-hoc network between palmld (with palmos) and palmtx (with linux).

What now? firmware loader from if_cs.c doesnt work so you have to enable wifi in palmos and then boot, anyone feels like fixing it?

Photos follow:
http://marex.hackndev.com/txwifi/p1020409.jpg (booting - notice card identification at the bottom and firmware version in the middle)
http://marex.hackndev.com/txwifi/p1020413.jpg (card was configured into ad-hoc mode, ip addr assigned etc.)
http://marex.hackndev.com/txwifi/p1020416.jpg (palmld detected the network and connected to it)
http://marex.hackndev.com/txwifi/p1020420.jpg (pinging palmtx using some ICMP generator for palmos)
http://marex.hackndev.com/txwifi/p1020421.jpg (see how palmld was configured)
http://marex.hackndev.com/txwifi/p1020431.jpg (after some pinging, you can see some data went through the interface)

So that's it.