Any other associated stuff that didn't fit in anywhere else gets dumped here. It may not be relevant, and it may not be of general interest but it is here anyway. This can be done with LILO, loadlin, or any other booting utility that accepts optional arguments.
All arguments are optional.
Otherwise it detects automatically. Selects the network device the values refer to. Multiple cards can only be enabled by explicitly setting up their base address using these LILO parameters. That region is reserved in the kernel's port registration table as if a device has already been found in that region. Note that this mechanism shouldn't be necessary on most machines.