FreeBSD ntpd

This is a very short sketch covering ntpd installation using FreeBSD and Expert mouseCLOCK USB II

• replace ntpd daemon at /usr/sbin/ntpd with a new compiled ntpd v4.2.4 (or later) configured with option "--enable-RAWDCF"

• link refclock-0 to cuaU0

# /etc/devfs.conf
link    cuaU0   refclock-0

• setup rc configuration

ntpd_enable="YES"

• setup ntp.conf

# /etc/ntp.conf anlegen
server 127.127.8.0 prefer mode 19

• patch uftdi kernel module to support the Expert mouseCLOCK USB II
  • Kernel Patch for Expert mouseCLOCK USB II : freebsd.org
  • to all appearances the Patch get release in FreeBSD Realease 7 officially

• recompile kernel module

cd /usr/src/sys/modules/uftdi
make
make install

• setup /boot/loader.conf to make uftdi load on system startup

uftdi_load="YES"
ucom_load="YES"

• check syslog if driver loads

ucom0: GUDEADS Expert mouseCLOCK USB II, rev 2.00/6.00, addr 2

• now you should have /dev/cuaU0 with a symlik /dev/refclock-0, ntpd running and reading DCF77.