1) Set up a build environment
 1.1 Get a FreeBSD 10.1 or 11 Host, this can be a VM or baremetal host.
 1.2 Install devel/git devel/subversion gsed python devel/gmake
   - pkg install devel/git devel/subversion  gsed python devel/gmake
 1.2 Get latest Kernel Sources
   - svn co https://svn0.us-west.FreeBSD.org/base/releng/10.1 /usr/src
    # svn co https://svn0.us-west.FreeBSD.org/base/releng/10.1 /usr/src
      Error validating server certificate for 'https://svn0.us-west.freebsd.org:443':
      - The certificate is not issued by a trusted authority. Use the
        fingerprint to validate the certificate manually!
      Certificate information:
 	- Hostname: svnmir.ysv.FreeBSD.org
 	- Valid: from Jul 29 22:01:21 2013 GMT until Dec 13 22:01:21 2040 GMT
 	- Issuer: clusteradm, FreeBSD.org, CA, US([email protected])
 	- Fingerprint: 1C:BD:85:95:11:9F:EB:75:A5:4B:C8:A3:FE:08:E4:02:73:06:1E:61
     (R)eject, accept (t)emporarily or accept (p)ermanently? p
1.3 Get crochet source and uboot from
     - mkdir /arm-images && cd /arm-images && git clone [email protected]:freebsd/crochet.git
     - git clone git://github.com/gonzoua/u-boot-pi.git /arm-images/crochet/u-boot-rpi
1.4 Build xdev
    edit /etc/make.conf
    WITHOUT_CLANG=yes
    WITHOUT_CLANG_IS_CC=yes
    WITH_GCC=yes
    WITH_GNUCXX=yes
  cd /usr/src && sudo make XDEV=arm XDEV_ARCH=armv6 WITH_GCC=1 WITH_GCC_BOOTSTRAP=1 WITHOUT_CLANG=1 WITHOUT_CLANG_BOOTSTRAP=1 WITHOUT_CLANG_IS_CC=1 WITHOUT_TESTS=1 xdev
  after build comment out the lines added to /etc/make.conf

2.0 Create board config file:
board_setup RaspberryPi
option Growfs
option User jescarri
FREEBSD_SRC=/usr/src

customize_freebsd_partition () {
    pw moduser root -V ${BOARD_FREEBSD_MOUNTPOINT}/etc/ -w yes
    sed -i '' 's/^#PermitRootLogin.*/PermitRootLogin yes/' ${BOARD_FREEBSD_MOUNTPOINT}/etc/ssh/sshd_config
    sed -i '' '/^ifconfig_ue0/d' ${BOARD_FREEBSD_MOUNTPOINT}/etc/rc.conf
    cat <<EOT > ${BOARD_FREEBSD_MOUNTPOINT}/etc/rc.conf
hostname="daemon-rpi"
sshd_enable="YES"
# Turn off a lot of standard stuff
# for more free memory.
cron_enable="NO"
#devd is necessary for proper DHCP operation;
# don't disable unless you know how to run DHCP manually.
devd_enable="YES"
syslogd_enable="NO"
sendmail_enable="NO"
sendmail_submit_enable="NO"
sendmail_outbound_enable="NO"
sendmail_msp_queue_enable="NO"
ifconfig_ue0="DHCP"
ntpd_enable="YES"
ntpd_sync_on_start="YES"
#### WiFi Config
wlans_urtwn0="wlan0"
ifconfig_wlan0="WPA DHCP"
EOT
cat <<EOT > ${BOARD_FREEBSD_MOUNTPOINT}/boot/loader.conf
hw.bcm2835.sdhci.hs="0"
legal.realtek.license_ack=1
if_urtwn_load="YES"
wlan_wep_load="YES"
wlan_ccmp_load="YES"
wlan_tkip_load="YES"
wlan_scan_ap_load="YES"
wlan_scan_sta_load="YES"
boot_multicons="YES"
boot_serial="YES"
console="comconsole, vidconsole"
comconsole_speed="115200"
EOT
cat <<EOT > ${BOARD_FREEBSD_MOUNTPOINT}/etc/wpa_supplicant.conf
network={
	ssid="YOUR_NETWORK_SSID"
	psk="PASSWORD"
}
EOT
    mkdir ${BOARD_FREEBSD_MOUNTPOINT}/root/.ssh
    chmod +rw ${BOARD_FREEBSD_MOUNTPOINT}/root/.ssh
    cp -Rp /root/.ssh/authorized_keys ${BOARD_FREEBSD_MOUNTPOINT}/root/.ssh/.
    cp ${BOARD_FREEBSD_MOUNTPOINT}/usr/share/zoneinfo/America/Los_Angeles ${BOARD_FREEBSD_MOUNTPOINT}/etc/localtime
}

3.0 BUild FreeBSD image
 ./crochet.sh -c config.sh



---
Build ARM Environment
1) Set the Environment:
    - install qemu-user-static
      - pkg install qemu-user-static
    - Build world
# export TARGET=arm
# TARGET_ARCH=armv6
# EMULATOR=qemu-arm-static
# DESTDIR=/arm-images/buildroot/blah
# BUILDPATH=arm-bsd-user
# export TARGET_ARCH
# export EMULATOR
# export DESTDIR
# export BUILDPATH
# export MAKEOBJDIRPREFIX=/arm-images/buildroot/obj

   build world
   make -j 8 TARGET=${TARGET} TARGET_ARCH=${TARGET_ARCH} buildworld
   install world
   make DESTDIR=${DESTDIR} TARGET=${TARGET} TARGET_ARCH=${TARGET_ARCH} installworld
   Install Distribution
   make DESTDIR=${DESTDIR} TARGET=${TARGET} TARGET_ARCH=${TARGET_ARCH} distribution

Copy the qemu-arm emulator to the buildroot
mkdir -p ${DESTDIR}/usr/local/bin
cp /usr/local/bin/${EMULATOR} ${DESTDIR}/usr/local/bin/${EMULATOR}

Install ports collection into the buildroot:
cd /var/tmp
fetch ftp://ftp.freebsd.org/pub/FreeBSD/ports/ports/ports.tar.gz
cd ${DESTDIR}/usr
tar -xpf /var/tmp/ports.tar.gz

Mount devfs onto the buildroot
# mkdir -p ${DESTDIR}/dev
# mount -t devfs devfs ${DESTDIR}/dev

chroot onto the buildroot

chroot -u root ${DESTDIR} /usr/local/bin/${EMULATOR} /bin/sh

Start ldconfig to create the ldconfig so you can build and link programs
service ldconfig start

-- DONE, LOG OUT OF THE CHROOT AND CREATE A TARBALL so you have a clean snapshot!.

---
How to cross compile your own kernel module.

TARGET=arm
TARGET_ARCH=armv6
cd /usr/src
make kernel-toolchain TARGET_ARCH=${TARGET_ARCH}

Run the following command to set all the env variables so you can cross compile

make buildenv TARGET_ARCH=${TARGET_ARCH} BUILDENV_SHELL=/bin/sh 
Entering world for armv6:arm
# cd /home/ec2-user/hello_world/
# make
# ls
@		Makefile	export_syms	hello_world.c	hello_world.kld	hello_world.ko	hello_world.o	machine
# file hello_world.ko
hello_world.ko: ELF 32-bit LSB shared object, ARM, EABI5 version 1 (SYSV), dynamically linked, not stripped