Some times people need to use wl kernel model to access broadcom wireless crads, I used it and it changed my interface name from wlan0 to eth1 but I can’t get scan with my card or connect any network in End I found how I can access it to work successfuly, if you need to use broadcom-sta do this things:
emerge -av broadcom-sta
And now you must reload your kernel modules with this command:
depmod
After you reloaded you modules you must add b43 and ssb modules to blacklist:
nano /etc/modprobe.d/blacklist.conf
And add this lines in end of the file:
blacklist b43
blacklist ssb
Now you must load wl & lib80211 modules:
modprobe wl lib80211
And in end you need to shutdown your computer (no reboot):
shutdown -h now
After you powered you pc you must up your wireless interface:
ifconfig eth1 (or eth0) up
Now you can use your broadcom successfuly!