Portage works only with firmware 1.0.4.3 firmware 2.5.8.0 should be /lib/firmware/isl3887usb_bare Reproducible: Didn't try
Created attachment 160764 [details] fetch and install prism54-firmware-2.5.8.0 like prism54-firmware-1.0.4.3 with new link name
Don't attach anything without a comment. If the ebuild doesn't need to be changed - just say it. If you attach something, a unified diff is preferred.
New net-wireless/prism54-firmware ebuild in tree, works with >=2.6.29 kernels.