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That's the problem, the config file is not in the /boot folder. I created a new one with the SPI=on instruction and it doesn't even work. I don't know if this config file is not in /boot but in another subdirectory.

The Linuxcnx version uses the raspbian kernel sources, so it is possible to enable the SPI interface on the RP4. The config.txt file is not in the same location as on a raspbian install, it's still under a sub directory of boot.
The raspbian kernel is patched to allow loading of overlays, the mainline is not.
Modify your config.txt file, reboot and look under the /dev folder for spidev.xx files and they will be there.
I've used rod images and made my own images using the same tools,for testing a diy mesa 7c81 and know that it does work.

We made sure that SPI did work, at least on the RPi4, the RPi5 is a different kettle of fish.

I have the official version of Debian 12 installed on my PI4, and I use it with my Mesa 7c81, the only problem is that for some reason the SPI port is disabled from the kernel and therefore it is not possible to write a new firmware to that card . Is there a Debian 12 kernel used on the PI4 that has the SPI port enabled by default? . As the official version of the LCN page does not depend on RASPBIAN, it is not possible to enable it with raspi-config or by modifying the config file.

First of all thanks for the great work. 

is it just me or is the link on the website wrong?
www.linuxcnc.org/iso/rpi-5-debian-bookwo...23-11-17-1520.img.xz
it say: LinuxCNC 2.9.2
but when I start it it say 2.9.1 

I thought I had an older one so I reinstalled today and still the same. 
Can I upgrade linuxCNC and GMOCCAPY?
i had some issues with GMOCCAPY now compared to when I was running the PI4 that I installed years ago.
One issue I had was when I pressed the aport button during a probing script, it did not stop but the GUI changed. 
I will try to reproduce. 
I copied my old config. Can that be the issue? I thought you could 
github.com/swepeter/PrintNC
Thanks all

Linuxcncrio is another great project. The dev is a great guy.
I designed a couple of boards that connect to FPGA board available on AliExpress, so far I’ve been using Mesa firmware so it operates as a 7c81, but with some help from meister ( forum member & dev of linuxcnc-rio) I can also run his firmware as well.

Thanks very much.
You tell me severalnew things, esp re: spi.

My trusty pentium4 died recently,
after years of being on lifesupport.

luckily, I have an Rpi4 to try SPI remora MKS masahup.
(and a i686 that I can dictate this to)

(note for oother vision impairted, try nerd-dictation)

again, thanks!