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I reply into this because I had the same problem and solved it (thanks to Crish as always for the help) you probably are not calling tool prepared, or something iocontrol.x.tool related that "hangs" the toolchange

In my case was something like calling M64P7 with:
net ATC-pocket-reached motion.digital-out-07 iocontrol.0.tool-prepared

I got Linuxcnc to start, thanks for the guidance.
Regarding 3D acceleration, it's clearly something in the kernel that I can't get it to work.
I also made an overlay to block mali at startup and load Panfrost. It loaded but with an error.
~$ sudo modprobe panfrost
dmesg | tail -20 | grep -i "panfrost\|drm"
[   60.606789] panfrost: unknown parameter 'enable_mmu' ignored

~$ XDG_RUNTIME_DIR=/tmp glxinfo -B | grep "OpenGL renderer"
OpenGL renderer string: llvmpipe (LLVM 19.1.7, 128 bits)

I made the system with: Armbian_25.8.1_Orangepi5_trixie_vendor_6.1.115_minimal.img. After that I installed Cinnamon. I have Mesa 25.0.7-2 installed.

Hello, everyone.  I'm new to this. I'm from Spain, and I can hardly find any information about LinuxCNC for 5-axis machining centres. Let me explain. I have a robust 3-axis desktop CNC, running on Arduino + CNCShield. I am designing and building a table to add A/B axes and make it 5-axis. What controller board do you recommend for using LinuxCNC? My knowledge is limited. The drivers for my motors with encoders have Step/Dir. If there is a post from someone who has built a 5-axis CNC using LinuxCNC, I would appreciate it. Thank you.