keeping up-to-date on RPi2/FreeBSD11

[John]

Hello list,

I'd like to keep my system up-to-date. Also, might be able to speed up
the system a bit by removing options witness/invariants. Although I can find
plenty of informative websites detailing how to initially build (using crotchet) 
and install FreeBSD on RPi2, I can't find where (for RPi2) to configure the 
kernel and build/installworld in-place on the RPi2. I can see the crossbuild 
targets in /usr/src/Makefile on another -CURRENT machine but thought I'd ask 
here first as freebsd-arm evolves very rapidly. Basically, I need to know:

1. where the kernel config file is
2. how to build/install a new world on this platform

for an in-place upgrade like you'd do on i386/amd64

thanks, 
-- 
John