On 25 August 2016 at 05:25,  <[email protected]> wrote:
> I have a gantry router with 2x X motors.  I'm using the "gantry" component.

Have you considered using the Master branch? Gantries are a lot simpler there:
http://linuxcnc.org/docs/devel/html/getting-started/updating-linuxcnc.html#_updating_configuration_files
You don't need the "gantry" component with that LinuxCNC version.

> X2 axis is 3.  axis.3.home-sw-in axis.3.neg-lim-sw-in do not exist to connect 
> to, neither one.

What is the "num_joints" of your "loadrt motmod" line?

> What's the homing situation like on this?

I believe that the home switches connect to the "gantry" component
rather than to the axis.N.home switches.
There is a sample config here:
https://github.com/cdsteinkuehler/linuxcnc/blob/0e0418b362f45d7ad332fa3f211cbf8c2f24efd9/configs/ARM/BeagleBone/Probotix/Comet.hal#L101


-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1916

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