http://wireless.kernel.org/en/users/Drivers/b43#fw-b43-new

for new version (see http://comments.gmane.org/gmane.linux.drivers.bcm54xx.devel/11581):
- download and extract http://mirror2.openwrt.org/sources/broadcom-wl-5.10.56.27.3_mipsel.tar.bz2
- git clone git://git.bu3sch.de/b43-tools.git
- cd b43-tools/fwcutter
- make
- cd ../..
- mkdir ./fw
- ./b43-tools/fwcutter/b43-fwcutter -w ./fw/ ./broadcom-wl-5.10.56.27.3/driver/wl_apsta/wl_prebuilt.o
