Can the OPI5 be Configured to Run LCNC?

Tonight, I visited a buddy. We're both "techno hoarders". Neither of us want to throw away something that might be useful in the future. He got a Enco tapping jig, that I got with the mill. I got two FRP electronics enclosures, relays, cables, connectors, bus bars, fuse holders, and a few other odds and ends. None of that stuff seems expensive, until you have to outfit a build with it all.

When I got home, following the LinuxCNC install directions posted in the OP, I installed the Arbiam OS on the OPi5. I had to download and install Belena Etcher, a program for writing the images to SD cards. The RaspberryPi writer wouldn't work. Said the image was corrupted. Anyway, on the other computer right now, I'm watching a This Old Tony video, the one where he tries to replace the ball bearings in a ball nut. He's such a hoot. In the background, I have the linuxcnc latency test running and have 20,312 in the servo thread and 7,375 in the base thread.

I haven't figured out how to post a picture to this forum, but with six glxgears running, and browsing this forum with Firefox ESR This is with nothing more that royka's image, and the installation of linuxcnc-uspace.  Is wayland really needed?

 

I changed the isolcpus to 2,5,7 and got essentially the same results. After the screenshot, I got a few outliers out to +-12us when I loaded some videos and browsers and stuff. That is about what I'm getting this morning with the updated settings.

Looking at what people are reporting from other computers, I think I can call this good enough for now and move on to the next steps? Linking the GPIO pins to the BOB and getting them configured to drive steppers?  I think for that I need the dtb prepared by Guglielmi (I think)?

Hi, this is my latency test with wifi active:


and this without wifi:
 

Impressive!
To be honest I never tried to activate videos or other stuff, just 6 Glxgears because the OPI5 in my case will run only LinuxCNC.. 
I need a stable reference in order to understand the best setup.
Here I would exagerate   isolating all bigger cores...

In order to use GPIOs I can provide the driver that it's currently working on my side but as I wrote I tested only one channel with oscilloscope.
I will not use BOB interface but I will build on my own, so I need some days more to create pcb and try with hardware.
After that I will share here.

Wanting to see a motor move this century, I'm going to avoid building my own. I bought a BOB from Amazon. No documentation and very suspect electronics. Cold solder joints. A capacitor that looks like it fell on the board during manufacture.

I think the fastest way to the finish line, and still have use of the ethernet port, would be a "7C80 RPI interfaced Step&dir plus I/O interface".

Can anyone suggest if that would be the way to get an OPi5 to control three steppers and two fluid pumps?

Wanting to duplicate Guglielmi's performance, I played a little with isolcpus. 2,4-7 resulted in a unusably slow UI. Starting Firefox took almost a minute.
"2,5-7" is passably usable, and results in the below with a video running, and me editing this post:

 

More testing.
Why do we run glxgears? It doesn't seem to make a difference at all in the latency. If I have six running, and start the histogram, I get the same result as if I have none. The big hits are when I move windows around in the UI or start a video.

Could it be that the animation just isn't a big hit on the OPi5 like it is other architectures?