Xircom driver works with kernel 2.2 but not with 2.4

[AuM.Graefe]

To get a better USB support I've upgraded my notebook from kernel 2.2 to 2.4.23 
(selve compiled with carefully choosen kernel options).
It seems that everything works except my Xircom network PC-card. Now, when I 
insert the card, the kernel says:

kernel: Linux Kernel Card Services 3.1.22
kernel:   options:  [pci] [cardbus] [pm]
kernel: Intel ISA PCIC probe:
kernel:   Intel i82365sl B step ISA-to-PCMCIA at port 0x3e0 ofs 0x00, 2 sockets
kernel:     host opts [0]: none
kernel:     host opts [1]: none
kernel:     ISA irqs (scanned) = 3,4,7,9,10,12 status change on irq 10
cardmgr[67]: initializing socket 1
cardmgr[67]: socket 1: Xircom CEM28 Ethernet/Modem
kernel: cs: memory probe 0x0c0000-0x0fffff: excluding 0xe4000-0xfffff
cardmgr[67]: executing: 'modprobe xirc2ps_cs'
kernel: xirc2ps_cs.c 1.31 1998/12/09 19:32:55 (dd9jn+kvh)
cardmgr[67]: executing: 'modprobe serial_cs'
cardmgr[67]: get dev info on socket 1 failed: No such device

With my old kernel 2.2 the last lines are:

cardmgr[85]: executing: 'modprobe serial_cs'
kernel: eth0: Xircom: port 0x2e0, irq 3, hwaddr 00:80:C7:F4:04:93
kernel: tty01 at 0x02f8 (irq = 3) is a 16450

I've only upgraded the kernel and the modules, not the /etc/pcmcia folder. But I 
think the error has nothing to do with the config files in /etc/pcmcia because 
it occures before any of those scripts is started.

Has anybode an idea how to get the card working?

Martin