Red Hat allows for 'driver disks' to be loaded during an install in case there is no out-of-the-box driver support for a specific piece of hardware. Basically, a driver disk is an ext2 disk image which can be created in the following steps:

Create Driver Disk[edit]

 1  # Create a blank, 20MB image
 2  dd if=/dev/zero of=driverdisk.img bs=1M count=20
 3  
 4  # Format the image with ext2
 5  mkfs -t ext2 -q driverdisk.img
 6  
 7  # mount it and copy the files over
 8  mount -o loop driverdisk.img /mnt/driverdisk
 9  
10  # copy drivers to /mnt/driverdisk, then run
11  umount /mnt/tmp

Once you have the driver disk created, you will need to tell the installer to load it by booting into linux expert or linux dd from the boot loader.