custom kernel
http://www.freebsd.org/doc/en_US.ISO...nelconfig.html
more or less:
grab the src using cvsup
edit kernel config file
#cd /usr/src
#make buildkernel KERNCONF=MYKERNEL
# make installkernel KERNCONF=MYKERNEL
Updating your system:
http://www.freebsd.org/doc/en_US.ISO...makeworld.html
cut it short for ya:
use cvsup to get the updated sources
read /usr/src/UPDATING to see if you need to do anything special for the upgrade
# cd /usr/src
# make buildworld
# make buildkernel
# make installkernel
# reboot
# mergemaster -p
# cd /usr/src
# make installworld
# mergemaster
# reboot
Even though it's probably obvious i'm going to point out that freebsd is an OS not just a kernel ( like linux ) hence, you need to keep the userland and kernel in sync. ie. do NOT install an updated kernel without updating the userland and vice versa
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