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  • unknown
  • unknown
24 Oct 2025 06:41 - 24 Oct 2025 10:14
Replied by unknown on topic Proposal RPi Linuxcnc Image Based on Raspi OS All welcome/encoraged to comment

Proposal RPi Linuxcnc Image Based on Raspi OS All welcome/encoraged to comment

Category: Installing LinuxCNC

Current state of Trixie:
Images build fine & boot, with non rt kernel.

6.12.47 kernel crashes
6.12.47 headers cant' be installed due to gcc version issues

6.12.34 kernel is good
6.12.34 headers can't be installed due to gcc version issues

Issues installing Linuxcnc built from image below wont install due to version issues with a lot of packages.

Using Trixie image downloads.raspberrypi.com/raspios_arm64/...-trixie-arm64.img.xz can have 6.12.34 kernel & headers installed.

I'll have to do some greater investigation.

Wanna know a secret, I did a big stupid, didn't realise the image was armf instead of arm64.

Current state of Bookworm.
All appears to be good, build process needs some tweaks, login screen and having xfce the default desktop plus a few little more odds and sods. Basically it works, just would like it a little more user friendly. Good thing regarding this build system is you can set your OS settings when using RPi-Imager, something that was not possible with the earlier build system.

Non necessary stuff (eyecandy), would like to have a linuxcnc themed splash screen (plymouth theming), login background (lightdm config) and desktop background. Just some Linuxcnc "branding".
  • eoverton
  • eoverton
24 Oct 2025 05:18
Replied by eoverton on topic Remora with STM32H753ZI

Remora with STM32H753ZI

Category: Computers and Hardware

How close are you, and how can I help? It's been three or four years since I worked on an ST ARM core, but I do work in the embedded world all the time, and I'm happy to be of assistance. With a little bit of digging, I can probably even find my old ST background debug dongle and the tools to support it.

I presently have a strong interest in seeing this project through to completion. I have been standardizing my computer controlled systems on a Bigtreetech Manta M8P board, which basically is a breakout board for a Raspberry Pi CM4 with an ST32H723ZET6 on it to run the lower-level stuff. I've had very good luck with it using it for Klipper/Mainsail/Crowsnest to run a 3D printer. And since the stepper drivers I want to use to drive the motors on my milling machine drop right in, I'd like to bridge LinuxCNC to it. The higher current drivers (like variants of the TMC5160) use SPI, so I'd need that driver. And it'd be nice to be able to poll a few GPIO's so I can move the mill bed with a joystick for setup. But it shouldn't be *that* difficult, I don't think.

Just let me know if/how I can contribute.
  • unknown
  • unknown
23 Oct 2025 17:56
Replied by unknown on topic 7i92H

7i92H

Category: General LinuxCNC Questions

Mesa have a product called spinx or similar, converts digital pwm to isolated analogue out.

The new image I'm working is created using the same utility that Raspberry Pi company uses to create their own images, so basically raspios with a real time kernel and Linuxcnc pre installed. Far more raspios than the previous.
  • Will_cnc
  • Will_cnc
23 Oct 2025 08:09
Leadshine EL8 Servo motor clonking sound and motion was created by Will_cnc

Leadshine EL8 Servo motor clonking sound and motion

Category: EtherCAT

Current Setup:
  • Raspberry Pi 5
    • 3 × Leadshine EL8 Servo Drives and 400W Motors

      Problem:
      I’ve recently set up LinuxCNC on a Raspberry Pi 5 and configured it to use the Probe Basic user interface.I’m experiencing an issue where the servo drives occasionally disconnect. The main symptom is that the motors sometimes make a “clonking” sound while running, as if there’s a mechanical fault and judder under movement . Power-cycling the system (turning it off and back on) sometimes clears the issue, and the motors then run normally.
      Could this problem be caused by poor latency on the Raspberry Pi 5, or possibly by the EtherCAT network going out of sync?Any advice or suggestions on how to resolve this issue would be greatly appreciated.

  • unknown
  • unknown
22 Oct 2025 21:44
Replied by unknown on topic 7i92H

7i92H

Category: General LinuxCNC Questions

As an addendum to the above post, I'm working on a new Raspberry Pi image, suitable for both the 4 & 5 based on the raspios, that has all the nice setup features of a standard raspios image.

I'm hoping to create both a Bookworm & Trixie image.
  • unknown
  • unknown
22 Oct 2025 21:41
Replied by unknown on topic 7i92H

7i92H

Category: General LinuxCNC Questions

A Raspberry Pi has its own I/O pins (albeit limited to 3.3V); connection via ethernet seems a bit stupid.


 


That is horribly bad advice. When using the GPIO pins on an RPi you require a base & servo thread, as you would with a PC with a Parallel port. Using a Mesa Ethernet card, in the case of OP, or a Mesa SPI card you only require a servo thread.
I use a RPi5 with a Mesa 7i92 & 7i76(plus some other smart serial cards) and I am very happy with it.

Yes the RPi5 requires an external PSU (does that really need to be mentioned ?) but some mini PC's require an external as well. Lenovo is one brand that comes to mind, I think the power blocks are similar to the Laptop power blocks.

Thin Clients may also be an option HP T630 are not so expensive on the second hand market and have a Quad core CPU,
www.parkytowers.me.uk/thin/hp/t630/
  • Ingo
  • Ingo's Avatar
22 Oct 2025 20:31
7i92H was created by Ingo

7i92H

Category: General LinuxCNC Questions

Guys, I'd like to hear your opinions.

I have a 7i92H and would like to build something very compact with reasonable performance. What do you recommend using, a Raspberry Pi4, Pi5, or even a mini PC?

Ingo
  • unknown
  • unknown
21 Oct 2025 12:27
Replied by unknown on topic fixing "raspi firmware" errors on the official amd64 ISO

fixing "raspi firmware" errors on the official amd64 ISO

Category: Installing LinuxCNC

The RPi doesn't require an installer the way the PC platform does.
Plus I'm looking at some other tools put out by the Raspberry guys that look pretty good.
  • unknown
  • unknown
21 Oct 2025 11:19
Replied by unknown on topic Update LinuxCNC 2.9.5 on debian 13

Update LinuxCNC 2.9.5 on debian 13

Category: Installing LinuxCNC

I've been playing with pi-gen.....I think it is a little better, you get a more raspberry pi like experience. There's a link in my proposal thread. ATM the moment I've been building upto the "lite" stage burning & booting and installing the desktop,Xorg and the rest. Linuxcnc has been from the debian repo.....But I should be able to fine tune things.

Bookworm has been the target so far, Trixie shouldn't be an issue, but one thing I really need to know is the status of linuxcnc.org/docs/2.9/html/drivers/hal_gpio.html . I think there was an issue with the libgpiod library.
Bookworm version is 1.6.3-1
Trixie version is 2.2.1-2

You can burn to your boot device sing RPI-Imager and edit settings such via the imager.

There's realtime kernels available via the raspberry kernel repo. The Rpi4 4k page kernels run on the Rpi5.......so we may only need one image to cover both boards.
  • andypugh
  • andypugh's Avatar
20 Oct 2025 21:19
Replied by andypugh on topic Update LinuxCNC 2.9.5 on debian 13

Update LinuxCNC 2.9.5 on debian 13

Category: Installing LinuxCNC

However, the debian package itself seems to have a broken python3 dependency. I'm on the latest Raspberry Pi OS Lite (which is basically trixie with a custom kernel and a few Pi-specific tools installed). Any particular reason for the arm64 package to want python3 < 3.12? amd64 one depends on 3.13, and so does linuxcnc-uspace 2.9.4 that comes with trixie.
 

It's possibly a consequence of the recent Pi .deb that I posted being built on Bookworm as I don't have a Pi running Trixie at the moment. 
The Debian package control files don't specify a version, but it is possible that a dependency is introduced by the configure step of the software build. 

I have a feeling that the package for the Pi in www.linuxcnc.org/dists/trixie might be the Bookworm package rather than one built on Pi/Trixie. I don't know how that happened at this point, I might just have been hoping that it would work and have now found out otherwise 
 
  • unknown
  • unknown
19 Oct 2025 07:58
Replied by unknown on topic Proposal RPi Linuxcnc Image Based on Raspi OS All welcome/encoraged to comment

Proposal RPi Linuxcnc Image Based on Raspi OS All welcome/encoraged to comment

Category: Installing LinuxCNC

Ok you're telling me not to use a kernel that I have practical experience and have not had a single crash or anything similar. Neither have any users reported any crashes. I think an uptime of 39 days and being able to start Linuxcnc at anytime during that period with no crashes, latency errors or any other such issues proves to me that the kernel is solid and stable.
Before using it on the mill, I had been using to test some Mesa clones one based on a 7c81 and another more less based on the 7i92 design. I've also tested Ollie's riocore system, on the same 7c81 clone hardware early this year, before Oliie got his hands on a genuine Mesa 7c81 that he has made riocore formware for.
Could you point me to any papers, references or any such peer reviewed articles explaining why the 16k page kernel is broken by design.

So this time I will stand by my choices for the RPi5. Unless of course you can provide hard evidence as requested above.

Even this page says to config 2711 for RPi4 to RPi3 and 2712 for RPi5.
www.raspberrypi.com/documentation/computers/linux_kernel.html
  • unknown
  • unknown
19 Oct 2025 06:55 - 19 Oct 2025 06:56
Replied by unknown on topic Proposal RPi Linuxcnc Image Based on Raspi OS All welcome/encoraged to comment

Proposal RPi Linuxcnc Image Based on Raspi OS All welcome/encoraged to comment

Category: Installing LinuxCNC

A couple of things related to choosing a Kernel for Linuxcnc.

For the RPi4 you require options for the bcm2711 in the config.
For the RPi5 you require options for the bcm2712 in the config.

The change of the SoC broke a lot of stuff that broke GPIO stuff. What previously worked on the RPi4 failed on the RPi5. In the context of Linuxcnc this required a rewrite of the SPI driver for the RPi5.

For both SoCs
CONFIG_PREEMPT_RT=y
must be set. Otherwise we dont get the real time model required.

In the link you gave for the configs only the bcm_2711 rt config has that option set. The bcm_2712 config does not.

With regards to the kernel version the one on the image is uname -a
Linux raspberrypi 6.12.11 #1 SMP PREEMPT_RT Mon Jan 27 00:10:15 AEDT 2025 aarch64 GNU/Linux

This was built from the 6.12.y branch in January. Whilst not to up to date 6 months later it was in January and has proved to be stable. With regards to the kernel itself there have been no reports of crashing, except one user whilst using GMOCCAPY but this was traced to zram swap issue.

This is the one running my RPi5 on the mill, it's been up for 39 odd days with no issues. Having the power saving stuff turned off on the wifi has been constantly connected for those 39 days. Usually it powers down after some time.
  • f355
  • f355's Avatar
19 Oct 2025 05:41
Replied by f355 on topic Proposal RPi Linuxcnc Image Based on Raspi OS All welcome/encoraged to comment

Proposal RPi Linuxcnc Image Based on Raspi OS All welcome/encoraged to comment

Category: Installing LinuxCNC

I've tried looking for a RT_PREEMPT kernel in the repos, but could only find kernels that were configured for Real time not Preemptive real time (which is what Linuxcnc requires).


the packages are on archive.raspberrypi.org . you want linux-image-6.12.34+rpt-rpi-v8-rt, it works for both RPi 4 and 5. there's a meta package linux-image-rpi-v8-rt that depends on the latest version of the RT kernel, but it gives you auto-updates with apt, which is not necessarily a good idea (e.g. the currently-latest 6.12.47 is hanging my Pi5 sometimes).

it is a proper PREEMPT_RT kernel:
$ uname -a
Linux ratcage 6.12.34+rpt-rpi-v8-rt #1 SMP PREEMPT_RT Debian 1:6.12.34-1+rpt1 (2025-06-26) aarch64 GNU/Linux

in order for bootloader to use it, you need to add kernel=kernel8_rt.img to /boot/firmware/config.txt.

the kernel configs themselves are here .
  • unknown
  • unknown
18 Oct 2025 23:15
Replied by unknown on topic Proposal RPi Linuxcnc Image Based on Raspi OS All welcome/encoraged to comment

Proposal RPi Linuxcnc Image Based on Raspi OS All welcome/encoraged to comment

Category: Installing LinuxCNC

@f355

I've tried looking for a RT_PREEMPT kernel in the repos, but could only find kernels that were configured for Real time not Preemptive real time (which is what Linuxcnc requires).
Debian doesn't have any support for the RPi5 as it doesn't have enough upstream kernel support.
wiki.debian.org/RaspberryPiImages#Overview

and

raspi.debian.net/tested-images/

So to get a full RT_PREEMPT kernel the only solution it would seem is to roll our own. Which would not be a suitable solution for upgrading.

One solution maybe if Linuxcnc could host suitable kernels, but I really don't see the sense in a regular upgrade regarding the kernel in this situation. I'm still running the original kernel that was built whilst building the image in Jan 2025.

BTW running pi-gen builds a couple of flavours of images everything from lite to a fully image. Tho it does use a significant amount of disk space.
  • f355
  • f355's Avatar
18 Oct 2025 13:29
Replied by f355 on topic Proposal RPi Linuxcnc Image Based on Raspi OS All welcome/encoraged to comment

Proposal RPi Linuxcnc Image Based on Raspi OS All welcome/encoraged to comment

Category: Installing LinuxCNC

first of all, thanks for the kind(-ish, lol) words, I'm happy to be helpful to the community even if it is just planting ideas into smart people's minds :)

have you seen github.com/raspberrypi/rpi-image-gen? to me it looks like a better fit for the purpose - all we need is to install some packages and configure some things, right? building the entire distro from scratch seems excessive.
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