I thought this would be an easy answer. Looks like the prism54.org site is in a major change. It also looks like they are producing drivers for the softmac cards as well. I will have to get some spare time and review the site. At this time I have no way of putting the firmware driver up.
Went to the Internet Way Back Machine site to pull old websites. I was able to download the driver from here. http://web.archive.org/web/200402101...//prism54.org/
. Hopefully the link will work for you if not goto http://www.archive.org/
and type in prism54.org in the WayBackMachine box. I went to the Feb 10, 2004 link.
You would be amazed what one can find this way.
My post on the subject is here. http://www.linuxquestions.org/questi...hreadid=295200
Hope this helps.