Automatic kernel configuration from dmesg output

[Ara Avvali]

Hi I am sorry to ask this, but yesterday I was looking to see if there 
is anyway to read the output of dmesg and automatically convert it to a 
readable format to be used to compile the new kernel. In that way it 
will be more specified based on that hardware and making sure I am not 
removing stuff I need
Someone asnwered me back that it has been already dissuces and I swear 
that I can't find the link on mailing list. Did all kind of keyword 
search and nothing has shown up. May I ask the person who replied back 
to give more link plaese? Or if someone has it
I used google and found out that netbsd has such a thing which does 
cataclysm what I want, adjustkernel, but isthere such a thing for freebsd?