own kernel vs. update

Polytropon freebsd at edvax.de
Tue Jul 7 16:28:17 UTC 2015

Re-including list, hope that's okay...

On Tue, 7 Jul 2015 18:00:22 +0200, Lev wrote:
> Is there any way to compile my kernel and put the result somewhere else, and
> make the bootloader load my new kernel?

Yes, this is possible. The kernel and the modules can be
found in /usr/obj - the subtree where all parts of the
compiled systems go before they are installed to their
final places. The KODIR variable can be set for the
installation process to _not_ default to /boot/kernel
for the results:

	# cd /usr/src
	# make kernel KERNCONF=MYKERNEL KODIR=mykernel

NB: "make kernel" is shorthand for "make buildkernel &&
make installkernel".

Then you can edit /boot/loader.conf to load your custom
kernel instead of the GENERIC one that's being installed
(and updated with freebsd-update):


This will make the loader load /boot/mykernel/kernel
and ignore /boot/kernel/kernel (the GENERIC kernel).

See "man loader.conf" and /boot/defaults/loader.conf for
details and examples.

Maybe this is helpful:



> And if I want to run the stock
> kernel, I can chose between FreeBSD's and mine?

The loader allows that, too. Its interactive mode can
be used, see the "unload <name>" and "load <name>"
commands when the boot loader has been interrupted.

	unload mykernel
	load kernel

This assumes you're not using the boot menu.

Magdeburg, Germany
Happy FreeBSD user since 4.0
Andra moi ennepe, Mousa, ...

More information about the freebsd-questions mailing list