Different behavior of Linuxcnc 2.7.14 on stretch compared to Wheezy

Hi guys,

I tried for interest sake to install stretch, RT kernel and linuxcnc from repository.
Interesting change in behavior for me - won't say it's bugs, but it's strange:

* while twopass=1 was working fine in wheezy, in stretch it fails at the loadrt hm2_pci line with some fault parameter not supported (I suppose because the hostmot2 was not really loaded in the 1st pass or sth.). This happens even with a PNCconf generated configuration.
* remapping of m6 works w/o issues in wheezy, while linuxcnc in stretch seems stuck. The ngc is called, (alert, something) will trigger the dialog. But no G- oder M-codes are executed.

Just curious whether this sth. to be expected...

Regards,
Daniel

I installed a plain debian stretch 9.9, then the preempt kernel, added the linuxcnc stretch repository, did an install of linuxcnc-uspace and linuxcnc-uspace-dev.

Started linuxcnc, selected one of the mesa examples => works.
Changed the machines ini-file to twopass=1 => breaks during start.

Hope this helps.

Regards,
Daniel

you shut update by synaptics or apt to 2.7.14

topass has been improved also on 2.8.master
better to go that way bevor mashining

pl7i92 wrote:

you shut update by synaptics or apt to 2.7.14

I am on 2.7.14 according to the starting screen.
2.7.14 was working properly with twopass when installed from the LinuxCNC wheezy live disc.
And it is not working when installed on stretch from the repositories.
Shouldn't it be the same version of linuxcnc? Or is the stretch repository a different version even though it says 2.7.14 at startup?

When you installed Linuxcnc did you add both the Linuxcnc and buildbot repos?
deb linuxcnc.org/ stretch base 2.7-uspace
deb buildbot.linuxcnc.org/ stretch 2.7-rtpreempt

Hello Todd,

I only used the first repository, installed the preempt rt kernel by

apt-get install linux-image-rt-amd64 linux-image-rt-amd64-dbg linux-headers-rt-amd64

and ran linuxcnc. Maybe this is the issue, if there are some linuxcnc specific modifications in the RT kernel.

Probably the most important part is the "base" in the first repo. That should take care of the modified dependencies specific to Linuxcnc. The buildbot repo will just get you the latest version of Linuxcnc. I really don't know what other issues could be causing your problem.

If there are still problems, I am really not sure. I've never actually ran a machine with an official Debian ISO. I've only tried it in a VM to see if Linuxcnc would install that way. (but certainly have not played with it enough to notice the problems you are seeing.)

I have ran a machine a little using the Linuxcnc Stretch ISO found here.
www.linuxcnc.org/testing-stretch-rtpreempt/
(But again I have not tried to use 2pass or do any g-code remapping on that.)

Those are live ISOs witth Linuxcnc already installed. I usually install one of those then install and change to the desktop of my choice (usually Mate).

There are no Preempt-RT kernel changes needed for LinuxCNC, but I can verify
that two pass has issues with master on Ubuntu18.04.

It seem more likely that this is some TCL version or library version issue

In the master branch, one can exclude individual hal files
for twopass processing if there are problems with a complicated
loadrt directive.

Ref: linuxcnc.org/docs/master/html/hal/twopas...#_exluding_hal_files