Compiling kernel
cd /usr/src/sys/i386/conf
cp GENERIC MYKERNEL
# Edit MYKERNEL with a text editor. e.g adding ipfw support, add the followings:
options QUOTA
options IPFIREWALL
options IPFIREWALL_VERBOSE
options IPFIREWALL_VERBOSE_LIMIT=1000
options IPFIREWALL_FORWARD
# SMP
options SMP
options APIC_IO
# on freebsd 7, already in GENERIC config
options SMP
device apic
Build and install
cd /usr/src
make buildkernel KERNCONF=MYKERNEL
make installkernel KERNCONF=MYKERNEL
The new kernel will be copied to the /boot/kernel directory as /boot/kernel/kernel and the old kernel will be moved to /boot/kernel.old/kernel. Reboot to use the new kernel. If your new kernel does not boot, choose the kernel you want to boot from at the
FreeBSD boot loader. You can access this when the system boot menu appears. Select the “Escape to a loader prompt” option, number six. At the prompt, type unload kernel and then type boot /boot/kernel.old/kernel.
Rolling back to previous kernel
at the boot prompt, do these
ok unload
ok boot kernel.old
Then if your box is not in secure mode, you can do these to rename /kernel.old to /kernel:
# check securelevel
sysctl kern.securelevel
# remove secure flag
chflags noschg /kernel
# rename the kernel and modules
mv kernel.old kernel
mv modules.old modules
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