I got it working now - but only with Cacko 1.23.
I followed the instructions atOESF-Cacko Board
and got WPA-PSK working with RC12.
Before that I flashed my firmware of the WCF12 (now: station V1.1.1 / primary V1.8.4) - you can find
the flash instructions in the thread above, too.
Type "hostap_diag wifi0" to look at the firmware versions.
And, yes - I use hostap in Cacko.
It connects fine with my WRT54GS.
Perhaps anyone gets it working in pdaxrom - I'll try it again with RC>RC12 - because
the ROM it's worth...
Thanks for all the hints (and the audience