Re: [Emc-developers] Hidden dependencies.

[Kent A. R. <ken...@gm...>]

Tuxcnc:

It's difficult to respond when you have provided so little information.

It would be nice to know at the outset what your intentions are. Just 
saying you "care for a small system with no unnecessary software" is not 
very illuminating. To paraphrase Einstein, the system should be as 
simple as possible, but no simpler.


On 9/26/2012 3:30 PM, tuxcnc wrote:
> I installed Ubuntu mini from
> http://www.ubuntu-mini-remix.org/download/10.04.1/ubuntu-mini-remix-10.04.1-i386.iso.

Okay, so this is a minimalist installation that has almost nothing in 
the way of software we need to build LinuxCNC nor does it have a 
real-time kernel or its headers, so it is capable only of supporting a 
pre-built LinuxCNC simulator, and then only in text mode, as you echoes 
in your next sentence.

> It is only text mode.
> Dpkg shows that all dependencies are met.

Dependencies of what, in particular? Dpkg deals with .deb packages. For 
what .deb package does dpkg show all dependencies are met?
> I installed Xorg and Fluxbox, via apt-get.

Okay, so now you have a minimalist installation that also has Xwindows 
and a meager window manager so it should support LinuxCNC GUIs, more or 
less. (At this point you have more or less what I have built on several 
ARM appliances in the past, so I'm generally familiar with it.)

> Then LinuxCNC of buildbot.
> 2.5 and  next 2.6 too.

What does this mean, exactly? At this point, you have no real-time 
kernel, and essentially none of the software needed for a build 
environment, so did you follow the instructions leading to "sudo apt-get 
install linuxcnc-sim"?

> Still dpkg shows that all dependencies are met.

Again, dependencies of what, exactly?

> The program works only partially.
> Can run and move the machine, but, for example, latency-test does not
> run at all.

When you say "can run and move the machine" I assume you mean you see 
things change in whatever LinuxCNC display you are using. (If you mean a 
real machine is moving under control, then stop reading now; I have no 
idea how you got to that.)

If this is so then everything you've said from the beginning of your 
message up to the word "but" in this last sentence suggests you have 
succeeded in installing and running a LinuxCNC simulator on a 
non-realtime Linux system.

What would you expect latency-test to test in this installation? On my 
non-realtime Ubuntu system, latency-test prints something like "Waiting 
for 'timedelta' to become ready" and then endlessly prints a 
period/fullstop line after line after line. Is this what you mean? It is 
expected.


I'll leave the remainder of your message to answer some other time.

Regards,
Kent