I'm using the following set up to build an NTP Server:

  • Raspberry Pi B+
  • Raspberry PI GPS Add-on
  • FreeBSD 10.1 built with CrochetBSD

I am able to boot my Pi without the GPS Add-on. When I plug in the GPS Add-on into the GPIO connector, my Pi fails to boot before starting the kernel.

It shows up to the point where it says "Press enter to prevent auto boot" and then the letter 'L' shows up and starts erasing text from the screen.

Why would plugging in the GPS Add-on cause this and how do I begin to trouble shoot the boot sequence?

  • What size power supply are you using?
    – goldilocks
    Jan 20 '15 at 18:58
  • The NEO-6 uses as quoted on another site 111 mW @ 3.0V (continuous) But what is the 5v supply required for on this PCB? The specs on the link provided are very skimpy.
    – Piotr Kula
    Jan 20 '15 at 19:25
  • @goldilocks I'm using the block that came with my HTC One M8. It's output specs are 5V 1.5A.
    – RNikoopour
    Jan 20 '15 at 21:03
  • @ppumkin I'm not sure what you're asking. The board itself doesn't have any inputs for power aside from the GPIO connector.
    – RNikoopour
    Jan 20 '15 at 21:04
  • 1
    Have you tried booting with Raspbian instead of FreeBSD?
    – Craig
    Jan 20 '15 at 21:33

It may be that the GPS module is interacting with the serial console.

Try disabling the serial console:

  • Remove console=ttyAMA0,115200 from /boot/cmdline.txt

  • Comment out the line T0:23:respawn:/sbin/getty -L ttyAMA0 115200 vt100 in /etc/inittab

  • This is what the FreeBSD Embedded emailing list said as well. I disabled the serial console in Raspbian and I was able to boot. I will confirm that this was the case for FreeBSD as well as soon as possible.
    – RNikoopour
    Jan 22 '15 at 5:11
  • I don't see either of those files...
    – RNikoopour
    Jan 22 '15 at 20:56
  • Those are on Raspbian. On FreeBSD /etc/ttys is used instead of /etc/inittab. I don't know the equivalent of /boot/cmdline.txt.
    – Craig
    Jan 22 '15 at 21:26
  • Thanks man! I'll give that a shot later. And when I figure out the proper steps to boot FreeBSD with the GPS chip attached I'll do a small write up.
    – RNikoopour
    Jan 23 '15 at 1:06

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