Choose the device with two NI cards

 Hello everybody,

I'm just new in using comedi device with rtai.
Here is my configuration :
Fedora Core 2
Kernel 2.6.8.1
Rtai 3.1
Comedi 0.7.70
NI 6053e
NI 6040e

My problem is that both cards use the same drivers ni_pcimio. How can I
choose the device for each card because I don't find any option in the
comedi_config manpage.
When I do :
comedi_config /dev/comedi0 ni_pcimio
 comedi_config /dev/comedi1 ni_pcimio

The NI6053e is on the comedi0 and the other one on the other device.
How could I surely put the NI6053e on comedi1 (using IRQ for example).
Thank you for you help.

Charles