[phoenix]

Clean out the /usr/obj directory:

# cd /usr/src
# make cleanworld

Update to the FreeBSD 7.0 source tree by setting tag=RELENG_7_0 in your supfile, then run:

# csup /path/to/supfile

Build the new world:

# cd /usr/src
# make -j2 buildworld

(Change the 2 to 1 more than the number of CPUs you have.)

Build a new GENERIC kernel:

# make buildkernel

Install the new GENERIC kernel:

# make installkernel

Reboot. If it boots correctly, then you can proceed to install the world:

# cd /usr/src
# make installworld

Then run mergemaster (be sure to only install files you haven't edited, and to merge files you have edited, like passwd and group):

# mergemaster -iU

Then reboot once more to load the new world. And then rebuild all your ports. If everything is working correctly, then you can edit your kernel config file, and build your custom kernel:

# cd /usr/src
# make KERNCONF=MYKERNEL buildkernel
# make KERNCONF=MYKERNEL installkernel

(where MYKERNEL is whatever your kernel config file is called)