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  • alangibson
  • alangibson
08 Jan 2025 11:38

RPi 5 with 6.12 PREEMPT_RT = Using POSIX non-realtime

Category: Installing LinuxCNC

Hello all. I'm trying out LinuxCNC 2.9.3 on the 6.12 kernel running on a Raspberry Pi 5. Installation goes fine, but LinuxCNC refuses to acknowledge I'm running a realtime kernel. On startup, it spits out the message: "Note: Using POSIX non-realtime"

However, `uname-a` shows:
Linux plasma 6.12.8-v8-16k+ #1 SMP PREEMPT_RT Tue Jan  7 22:00:59 CET 2025 aarch64 GNU/Linux

My installations script is here:
gist.github.com/alangibson/12700b72f737889536565896143eefe0

Can anyone make out my mistake? Or is there a known issue? I've searched but found nothing applicable.
  • PCW
  • PCW's Avatar
08 Jan 2025 00:34
Replied by PCW on topic LinuxCNC on Raspberry Pi 5

LinuxCNC on Raspberry Pi 5

Category: Installing LinuxCNC

If you did not cause more extensive damage, you (or someone local with the right equipment)
should be able to replace the ISL32174 that's fried...
  • resmond
  • resmond
08 Jan 2025 00:13
Replied by resmond on topic LinuxCNC on Raspberry Pi 5

LinuxCNC on Raspberry Pi 5

Category: Installing LinuxCNC

I just accidentally swapped the 24v output port on one of my RTelligent Drivers for the drive-stepper input ports and blew up at least one of the 6 stepper outputs (likely two) on my 7i95T.

Once I get past suicidal thoughts I will shift all my joints over to check the possibly that I may have only blown two step-gens. Each pair of two step-gens share the IC that smoked so I'm betting 0 and 1 are gone but if 2-5 are still viable I might be able to limp along and continue to make some progress on the router which is XYYZ configuration.

Ironically, I was just going back through all the wiring straightening it all out and zip-tying everything. I just happened to swap two identically looking plugs and poof 'magic smoke'.

Bit of trivia... the digital aspects of the 7i95 seem to have remain unharmed. Led's report no errors on start and LinuxCNC connects right up and thinks nothings wrong.

Worse than the cost, it took me six weeks to get that board from Mesa, so I Guess I had better order a new one before Trump's Tariff plans kick in.

:(
  • dogsop
  • dogsop
07 Jan 2025 00:04

Linuxcnc 2.9.2 and 2.93 images for Raspberry Pi 4b & 5

Category: Installing LinuxCNC

Yes what is there is 2.9.2.
Downloaded 2.9.3 and it makes a huge difference for me on the Pi 5.
I wasn't getting 1080p on the display and axis was always clipped and wouldn't show me the status area at the bottom of the screen.
Switched to the newer build and I've got 1080p and can see the full screen.

Thanks!
  • rodw
  • rodw's Avatar
06 Jan 2025 23:43

Linuxcnc 2.9.2 and 2.93 images for Raspberry Pi 4b & 5

Category: Installing LinuxCNC

I think so but it seems that 2.9.3 may not be  on the downloads page.
  • dogsop
  • dogsop
06 Jan 2025 23:33

Linuxcnc 2.9.2 and 2.93 images for Raspberry Pi 4b & 5

Category: Installing LinuxCNC

Are the images you post here the same ones that are on the Linuxcnc download pages for the RPi's?

Thank you
  • Martin.L
  • Martin.L
06 Jan 2025 09:07 - 06 Jan 2025 09:08
Replied by Martin.L on topic Raspi5 + VH229 no HDMI0 audio

Raspi5 + VH229 no HDMI0 audio

Category: Installing LinuxCNC

Thanks for your reply,

Here is my config, audio seems on

Warning: Spoiler!
  • Cant do this anymore bye all
  • Cant do this anymore bye all's Avatar
05 Jan 2025 01:04
Replied by Cant do this anymore bye all on topic LinuxCNC on Raspberry Pi 5

LinuxCNC on Raspberry Pi 5

Category: Installing LinuxCNC

I think starting a new thread would cause less confusion, generally it's a tool not required for the average user, and it helps to a have a good working knowledge of Linux, Linuxcnc and practical experience with the RPi platform. Oh and a bit of patience depending on the hardware one has access to.

I would of the opinion that too many images floating around could cause confusion, so generally once I have built and tested an image I tend to limit access to the created images.

These are just my thoughts on the matter.
  • TomAlborough
  • TomAlborough's Avatar
04 Jan 2025 18:59 - 04 Jan 2025 23:15
Replied by TomAlborough on topic LinuxCNC on Raspberry Pi 5

LinuxCNC on Raspberry Pi 5

Category: Installing LinuxCNC

Hi Rod,

Thank you for the leg up on the development environment. I've spent a chunk of time with it.

Should I use this forum thread to have conversations or would somewhere else be better?

Tom
  • nick_namsep
  • nick_namsep
04 Jan 2025 16:57
First time configuring ethercat was created by nick_namsep

First time configuring ethercat

Category: EtherCAT

Hello everyone, 

I have been working the past couple days on getting ethercat working and installed for my first linuxcnc project. I got ethercat working and the slave is showing the master command etc works so that is amazing but now i am stuck with the configuration part. I have not used linuxcnc before and i can't seem to find any well quite basic tutorials on how to set up a single axis and just get it to show in linuxcnc i have tried to make a config using a old tutorial but i just can't seem to figure it out. I am currently using a raspberry pi with Leadshine EL8 driver and the ethercat between these works just dont understand the config part. 

So if there is someone that would be able to help get me started that would be amazing.
  • Cant do this anymore bye all
  • Cant do this anymore bye all's Avatar
04 Jan 2025 11:34
Replied by Cant do this anymore bye all on topic LinuxCNC on Raspberry Pi 5

LinuxCNC on Raspberry Pi 5

Category: Installing LinuxCNC

Just created a Pull Request for the change required. So hopefully that can be ticked off the list.
  • rodw
  • rodw's Avatar
04 Jan 2025 11:26
Replied by rodw on topic LinuxCNC on Raspberry Pi 5

LinuxCNC on Raspberry Pi 5

Category: Installing LinuxCNC

If your interest is in kernels and the pi 5, the Linuxcnc builder (for the Pi 5 and 4b)
github.com/LinuxCNC/rpi-img-builder-lcnc
Is a fork of my repo
github.com/rodw-au/rpi-img-builder-lcnc/tree/linuxcnc-2.9.3
Which in turn is a fork of
github.com/pyavitz/rpi-img-builder
with Linuxcnc and the PREEMPT_RT kernel installed

Note the builder cross compiles on a normal PC and builds the official Pi kernel, then wraps Debian around it before installing Linuxcnc and a few other goodies in this script github.com/rodw-au/rpi-img-builder-lcnc/....3/files/userscripts

I got as far as merging the latest upstream code into my  master over Christmas but have not pushed it to my 2.9.3 branch as the default kernel has rolled forward from 6.1 used by Debian Bookwoem to 6.6
It's quite a business finding a Pi kernel commit that agrees with the PREEMPT_RT patch kernel version. 
The latest upstream source now supports the 6.12 kernel so it would be good to build for it as there is no need to patch the kernel anymore
ref: github.com/rodw-au/rpi-img-builder-lcnc/.../patches/userpatches
(but you still need to set the fully preemptible kernel in  menuconfig)
Cornholio has asked in another thread for changes to config.txt to support spi so there is a nice kernel related project here.
 
  • Cant do this anymore bye all
  • Cant do this anymore bye all's Avatar
03 Jan 2025 20:17
Replied by Cant do this anymore bye all on topic LinuxCNC on Raspberry Pi 5

LinuxCNC on Raspberry Pi 5

Category: Installing LinuxCNC

From memory the arduino is connected via a USB serial port so it’s very limited.

If you are looking at small form factor x86 based boards the Odroid h4 is probably worth a look. I’ve been using a h2 for years now, one of the good things about it is the dual Ethernet ports.
  • TomAlborough
  • TomAlborough's Avatar
03 Jan 2025 19:14
Replied by TomAlborough on topic LinuxCNC on Raspberry Pi 5

LinuxCNC on Raspberry Pi 5

Category: Installing LinuxCNC

Hi resmond,

Thank you for the summary of your interactions with the Pi 5 world and its parallels. It sounds like a win.

Hi cornholio,

GitHub/LinuxCNC certainly has a lot going on including "issues". Let me ask some questions there about helping.

Thanks,
Tom
  • resmond
  • resmond
03 Jan 2025 18:06
Replied by resmond on topic LinuxCNC on Raspberry Pi 5

LinuxCNC on Raspberry Pi 5

Category: Installing LinuxCNC

Now that I have my Pi 5 / Mesa 7i95T basically working (still re-reading Docs and tweaking ini/hal configs) I do like it and don't regret starting with it.

I faced the most challenges from the following:
  • Very rusty on Linux distro's, package managers and Kernel versions
  • The Docs, Form and Wiki are AWESOME but it's often a challenge to remember where something was documents to find and re-read the details once I hit a problem.  (Fortunately Google search will usually find Forum threads for error outputs.
  • Since the Pi4/5 are ARM based its more challenging to find Deb packages and APT sources for certain things.
  • I always started with the LinuxCNC Debian imaging for all my builds - then would screw it up from there.
I am planning to build up an Intel platform machine next to smooth out some of the ARM related challenges.  If I had it to do over I would have chosen Intel.

Here are a few of the options I'm looking at and I've used other boards for other projects.

LattePanda Mu ($105 on sale)
    A Micro x86 Compute Module (N100 CPU,8GB RAM,64GB eMMC)
     On DfRobot

Lite Carrier Board for LattePanda Mu Compute Module ($39)
(USB 3.0, Ethernet, PCIe 3.0, M.2 M key, HDMI)
     On DfRobot

The carrier has two PCIe slots (1x/3x) but most people will need to add wifi Intel M.2 Wifi ($19)
     On Amazon

So that's around $170 plus shipping then you have to choose a DC supply and this one is really fast if that matters.

LattePanda 2 Delta 432
A Pocket-sized Powerful Windows/Linux Single Board Computer (4GB RAM/32GB eMMC)
     On DfRobot

M.2 PCIe card riser ($30)  On Amazon
This one comes with WiFi so it just needs power. It has less memory than the Mu and needs the riser to plug in full sized PCIe cards but it comes with a fan.

LattePanda V1 (~160 on sale) On DfRobot
The Smallest Windows 10 Single Board Computer (Unactivated, 4GB/64GB)
Both the V1 and Delta 432 come with a built in Arduino with standard HAT connections but since this one does not have a PCIe compatible M.2 using PCI Mesa cards would be out. It would be Ethernet only.

I think it would be facinating to see what the built in Arduino might make possible for controlling odds and ends using the HAT boards.

 
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