Hi nixmeister,
The pcnet_cs driver is compiled into the kernel, it is not a loadable module.
I had a problem with this driver for my cf lan card. My card was not being identified correctly and was loading a incorrect driver.
With the card inserted run,
/sbin/cardctl ident
which will give the card info and more importantly the manufacturers id info.
eg: manfid: 0x021b, 0x0202 (this is my Netcomm CF cards info)
Search the /etc/pcmcia/config file for the manfid: returned from the cardctl command and see which driver is being bound to the card.
With my card it was binding the axnet_cs driver instead of pcnet_cs driver. I just had to edit the file and change the file name.
Hope this helps.