I am trying to get a Dell USB wirless NIC to work natively (that is, without NDIS wrapper) with a client's machine with Debian 5 Lenny, 2.6.26-1-686 kernel, and GDE. Getting the following error at boot (as recorded in DMESG) when the NIC is connected:
[ 14.920096] p54usb: cannot find firmware (isl3890usb)!
[ 14.920190] prism54usb: probe of 1-2:1.0 failed with error -2
I seem to have found the solution in what appears to be a driver or patch file but I'm unsure what to do with the file. Any insight or suggestions would be appreciated.

Please disregard system info in sig as this post is regarding another machine.