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redrathnure / armbian-mkspi

Armbian Linux Build Framework
https://www.armbian.com
GNU General Public License v2.0
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Klipper not able to start: mcu 'rpi': Unable to open port: [Errno 2] No such file or directory: '/tmp/klipper_host_mcu' #27

Closed wnto closed 6 months ago

wnto commented 6 months ago

What happened?

I installed

Armbian-unofficial_24.2.0-trunk_Mkspi_jammy_current_6.6.17.img.xz

on a new skipr motherboard and followed the

https://github.com/NexGen-3D-Printing/MKS-SKIPR-SETUP

kiauh works, I was able to flash the MCU (mks_skipr.bin file in sd card renamed to .CUR), Mainsail and klipper screen (pi-ts35) work, wifi works).

but I get the error

mcu 'rpi': Unable to open port: [Errno 2] No such file or directory: '/tmp/klipper_host_mcu'

in klippy.log.

running

systemctl status klipper-mcu

I get: Unit klipper-mcu.service could not be found.

service klipper-mcu start

and a8@mkspi:~$ service klipper-mcu start Failed to start klipper-mcu.service: Unit klipper-mcu.service not found. a8@mkspi:~$ Fa

finally,

a8@mkspi:~$ sudo sysctl -w kernel.sched_rt_runtime_us=-1 kernel.sched_rt_runtime_us = -1 a8@mkspi:~$ systemctl status klipper-mcu Unit klipper-mcu.service could not be found.

I read nexgen suggesting using the bullseye version, but that was in 2023. I will try that, anyway and see if it helps, but wanted to report this here for now. Pointers are welcome.

How to reproduce?

Command you gave to the framework!running

systemctl status klipper-mcu

I get: Unit klipper-mcu.service could not be found.

service klipper-mcu start

and a8@mkspi:~$ service klipper-mcu start Failed to start klipper-mcu.service: Unit klipper-mcu.service not found. a8@mkspi:~$ Fa

finally,

a8@mkspi:~$ sudo sysctl -w kernel.sched_rt_runtime_us=-1 kernel.sched_rt_runtime_us = -1 a8@mkspi:~$ systemctl status klipper-mcu Unit klipper-mcu.service could not be found.

Branch

main (main development branch)

On which host OS are you observing this problem?

Jammy

Relevant log URL

https://pastebin.com/yvDQStwj

Code of Conduct

wnto commented 6 months ago

For further reference, I found the following, from which I took the command used above, but this method failed me.

https://klipper.discourse.group/t/klipper-mcu-service-fails-to-start/12219

Same method also metioned more briefly in https://klipper.discourse.group/t/armbian-kernel-klipper-host-mcu-got-error-1-in-sched-setschedule/1193

redrathnure commented 6 months ago

Hi, klipper_host_mcu is a klipper service which works on MKS PI/RPI. Usually it's used to control CPU temp or map extra pins, buttons or sensors which connected directly to MKS PI/RPI. For example you may check https://github.com/redrathnure/armbian-mkspi?tab=readme-ov-file#adxl345spi-usage (step 2) or https://www.klipper3d.org/RPi_microcontroller.html articles

wnto commented 6 months ago

Thank you for your prompt reply. I am not trying to use the host side as a secondary MCU, so this was baffling me, as I also did find second article you mentioned. It turns out that the sample configuration file provided by MKS has the following section:

[mcu rpi] serial: /tmp/klipper_host_mcu

After deleting this section, it was possible to connect to the MCU and continue with the board's configuration.

Noob mistake, cost me a few hours, but now I know better. Thank you for providing us this alternative OS and support. Have a great week!