BCM43142 - Broadcom

http://elrepo.org/tiki/wl-kmod

Note :- The kernal version and kernal-devel version should be same for proper installation .

Step should be followed according to OS version . The doc is for Centos 6 and Centos 7.

Also need to remove default kernel-devel package

Sometime for few machine Vendor like Dell , you need to set the bios to default state.