[Buildroot] Device creation

[Bill Borton <security@conwin.com>]

On Thu, 7 Apr 2011 13:23:32 -0400
"Marc Leclerc" <marc-leclerc@signaturealpha.com> wrote:
> Hi, I am trying to get linuxpps working on my board using ntp. there are 
> steps described at 
> http://wiki.enneenne.com/index.php/LinuxPPS_installation which says to 
> use ldattach to assign the pps signal but so it seem I do not have 
> ldattach on my buildroot system and tryin to compile util-linux led to 
> compilation errors. Just wondering if anyone here has the know how to 
> get my /dev/pps0 created and assigned to my /dev/ttyS1. the steps also
> mentions using udev to get the /dev/pps0 created, i have tried installing and
> using it and it just messed up my other links
> 
> Best regards

/dev/pps0 is it's own device.  Look in /sysfs/class/pps/pps0/dev (you did build
support into your kernel, correct?) for the details and use mknod to create it:

mknod -m 0664 /dev/pps0 c 252 0


If you are trying to bring up ntpd with the generic NMEA driver you will
need to make a couple links to your ttyS1 and pps0:

ln -s /dev/ttyS1 /dev/gps0
ln -s /dev/pps0 /dev/gpspps0

/dev/gps0 (ttyS1) has your nmea stream.
/dev/gpspps0 (pps0) has your pps.

-Bill