I have a wireless nic : Allnet 0271, which is supported by prism54, and yast detects it correctly. 
I have also downloaded the firmware for the card, and it is loaded. 
But if I set network (in yast configuration) to use ifup I can see that the config script for the interface is not found.
I then made a symlink called for instance ifcfg-eth2 to /etc/sysconfig/network/ifcfg-wlan...... , and then the network script successfully 
executes the script.
I can see (using iwevent) that the nic issues an associate request to the wireless router which is accepted, but dhcp does not work on the wireless interface. If I try to set route and ip manually for the interface I still don't get a connection. The wired ethernet port connects to the same router with no problems.

Note: I am not using knetworkmanager because I saw a bug report stating that there was a problem with knetworkmanager and prism54.
Also when I did try using knetworkmanager I coule see that the nic never associated eith the router.

I am using KDE.