Configurar Wireless Broadcom BCM4312 en Centos 6.x en tres pasos.

Paso uno:
sudo yum install b43-fwcutter b43-openfwwf

Paso dos:
 cd /tmp

 wget http://downloads.openwrt.org/sources/broadcom-wl-4.150.10.5.tar.bz2

Paso tres: 

$ tar -jxf broadcom-wl-4.150.10.5.tar.bz2
$ cd broadcom-wl-4.150.10.5/driver
$ sudo /usr/bin/b43-fwcutter -w /lib/firmware/ wl_apsta_mimo.o 

This file is recognised as:
  ID         :  FW13
  filename   :  wl_apsta_mimo.o
  version    :  410.2160
  MD5        :  cb8d70972b885b1f8883b943c0261a3c
Extracting b43/pcm5.fw
Extracting b43/ucode15.fw
Extracting b43/ucode14.fw
Extracting b43/ucode13.fw
Extracting b43/ucode11.fw
Extracting b43/ucode9.fw
Extracting b43/ucode5.fw
Extracting b43/lp0bsinitvals15.fw
Extracting b43/lp0initvals15.fw
Extracting b43/lp0bsinitvals14.fw
Extracting b43/lp0initvals14.fw
Extracting b43/a0g1bsinitvals13.fw
Extracting b43/a0g1initvals13.fw
Extracting b43/b0g0bsinitvals13.fw
Extracting b43/b0g0initvals13.fw
Extracting b43/lp0bsinitvals13.fw
Extracting b43/lp0initvals13.fw
Extracting b43/n0absinitvals11.fw
Extracting b43/n0bsinitvals11.fw
Extracting b43/n0initvals11.fw
Extracting b43/a0g1bsinitvals9.fw
Extracting b43/a0g0bsinitvals9.fw
Extracting b43/a0g1initvals9.fw
Extracting b43/a0g0initvals9.fw
Extracting b43/b0g0bsinitvals9.fw
Extracting b43/b0g0initvals9.fw
Extracting b43/a0g1bsinitvals5.fw
Extracting b43/a0g0bsinitvals5.fw
Extracting b43/a0g1initvals5.fw
Extracting b43/a0g0initvals5.fw
Extracting b43/b0g0bsinitvals5.fw
Extracting b43/b0g0initvals5.fw

Paso cuatro: 

sudo reboot

Fuente: http://flakrat.blogspot.mx/2010/05/how-to-enable-broadcom-bcm4312-wifi-in.html