[arm-allstar] GPS, Adafruit ultimate module, and some hoops for the 1.1 image

[Joel Jameson]

I wanted to pass along this information as a reference, though the new
image is due in a couple weeks. Some of the stuff below is repeated from
the link, but was significant so I included it below.

I added in an Adafruit Ultimate GPS unit for precise time to connect a
"Allstar remote thin client" unit that requires GPS on both ends for proper
sync. Here is the link I'm working from:

http://the8thlayerof.net/2013/12/08/adafruit-ultimate-gps-cape-creating-custom-beaglebone-black-device-tree-overlay-file/

Some notes as I was getting things to work, or found them missing in the
current image:

dtc-overlay is for adding/compiling device overlays for the BBB.

> pacman -S dtc-overlay
>

For the PPS tools (go down to userland tools, down the next few sections
through the make line, copy ppstest to /usr/bin ):

> http://linuxpps.org/wiki/index.php/LinuxPPS_installation
>

For gpsd, I added the following at the start to rc.local to start it up
first thing on boot:

> /usr/bin/gpsd -n -F /var/run/gpsd.sock /dev/ttyO4
>

In the uEnv.txt file I had to add in (see below for how I got to your
version):

> gpio set 52
> optargs=quiet init=/lib/systemd/systemd
> capemgr.disable_partno=BB-BONELT-HDMI,BB-BONELT-HDMIN,BB-BONE-EMMC-2G
> capemgr.enable_partno=T8LO-GPS coherent_pool=1M
>

Here's the post about the gpio set 52 (note the mmc one time config):

> https://groups.google.com/d/msg/beagleboard/pSOre-xZz8o/aVi9bTAh-rsJ
>

The post on how to disable the eMMC and HDMI (for the weather cape, but
relevant)

> http://elinux.org/Beagleboard:Weather_Cape_Work-Around
>

I did need to recompile NTP. In ntp.conf, I added the following before the
server definitions:

> # NTP  GPS stuff
> # Read the rough GPS time from device 127.127.28.0
> # Read the accurate PPS time from device 127.127.22.0
>
> server 127.127.28.0 minpoll 4 maxpoll 4 prefer
> fudge 127.127.28.0 time1 0.535 refid GPS
>
> server 127.127.22.0 minpoll 4 maxpoll 4
> fudge 127.127.22.0 time1 0.000 flag3 1 refid PPS
>

To get to the uEnv.txt file

> export DISK=/dev/mmcblk0
>
> sudo mkdir -p /media/boot/
> sudo mkdir -p /media/rootfs/
>
> for: DISK=/dev/mmcblk0
> sudo mount ${DISK}p1 /media/boot/
> sudo mount ${DISK}p2 /media/rootfs/
>

Cheers,
Joel
W0KGW
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