cciss module problem with smart array 642 in lenny

[Antonio Javier Estrada Villegas]

i cannot install lenny in a compaq server with smart array 642.
the array and the disks are detected, but there is no entry for cciss in /dev. 
in /proc/modules i can see cciss module is "loading" and ps shows modprobe and 
/lib/udev/vol_id --export /dev/.tmp-104-0 in D < status