Back when I was packaging p54 as an out-of-tree kernel module I put
together a script to download the firmware at install-time. It used the
following data to work out which files to download and what to name them
on the local machine:
The firmware files are available on <http://prism54.org/firmware/>. I
don't yet have any information about their origin, copyright or
licensing status. I'm trying to find out from the administrators of that
web server.