We have a Linux GPIB 0.8 driver that does support the 2.4 kernel. You can obtain this driver from
ftp://ftp.ni.com/support/gpib/linux/
The file name is nigpib-linux-0.8.tar.gz, and it is a BETA driver. This means it may or may not work for you, but it has worked for our developers. If you have more questions, please contact us at http://www.ni.com/support for additional help.
Ryan Tamblin
Applications Engineer
National Instruments