I am new to hackintosh and have a D830 and had problems with setting up DELL 1395 which has a BCM4312 chip
I solved the problem with the above kext. I found that the kext BroadcomFix also works ...
I installed 10.6.3 and then upgraded to 10.6.8 now ...
the link to the kext .... http://www.osx86.net/view/1821-broadcomfix.kext.html