Best current advice for XXYZ servo gantry?

shasse wrote:

Secondly, the instructions on the forums for 2.8 currently have you end up with 2.9. To get 2.8 installed I had to add the following to /etc/apt/sources.list.d/linuxcnc-buildbot.list:

deb buildbot.linuxcnc.org/ wheezy 2.8-sim
deb-src buildbot.linuxcnc.org/ wheezy 2.8-sim

I think that that will give you a "sim" installation with no hardware driving capability.

You want
deb buildbot.linuxcnc.org/ wheezy 2.8-rt
deb-src buildbot.linuxcnc.org/ wheezy 2.8-rt

If you are using an RTAI kernel, or

deb buildbot.linuxcnc.org/ wheezy 2.8-rtpreempt
deb-src buildbot.linuxcnc.org/ wheezy 2.8-rtpreempt

If using the preempt-rt version.
(I am actually unclear where "uspace" fits in to all this)

I figured this out by poking about in the destination folder:
buildbot.linuxcnc.org/dists/

uname -a

Will tell you which kernel you are using.

If you are starting from scratch, start here, with a more up-to-date Linux distribution and the preempt-rt kernel:
www.linuxcnc.org/testing-stretch-rtpreempt/