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First lets talk about the images.
1: They are based on Debian repos built by a collection of custom scripts.
2: Whilst some images have been written to SD card via RPi Imager Balena Etcher is recommended.
2a: If you use Linux there are plenty of other tools, Ubuntu\Mint has USB Image writer.
3: If you use the RPi Imager any adding of user or wifi info does not work. As the image is a custom one, only the kernel is built from RPi Sources.
4: If you are using an Rpi5 & a 7c80 0r 7c81 the driver to be loaded is hm2_spix
5: If you are using an RPi4 & a 7c80 or 7c81 the driver to be loaded is hm2_rpsipi
6: The images now have the SPI interface enabled by default.
7: Location of config.txt  /boot/broadcom/config.txt once again this is a custom build.
8: raspi-config is not in the image, the tool to use is menuconfig.
9: The default username is cnc.
10: The default password is cnc.
11: The images are not meant to be a fully fledged daily driver Operating System, the are just enough to run Linuxcnc.

Links to images:
www.linuxcnc.org/iso/rpi-5-debian-bookwo...25-01-27-0140.img.xz
www.linuxcnc.org/iso/rpi-5-debian-bookwo...7-0140.img.xz.sha256

www.linuxcnc.org/iso/rpi-4-debian-bookwo...23-11-17-1731.img.xz
www.linuxcnc.org/iso/rpi-4-debian-bookwo...7-0404.img.xz.sha256

Hi! I've tried to install ethercat to the latest RPi5 image, however it does not work, seems to be some kind of kernel mismatch. I've managed to install it and get it working with cornholio's image found here (forum.linuxcnc.org/9-installing-linuxcnc...berry-pi-5?start=310). Any idea what might be the issue? Since I'm doing a fresh install I kind of want to install the latest :) Thanks!

Over the weekend Andy released linuxcnc 2.9.4
To upgrade an existing bookworm release running version 2.9 all you need to do is to typeAnd go and have a cup of coffee

The ISO has also been upgraded for new installs on Intel X64 hardware. Grab it from the LinuxCNC downloads page.

The raspberry pi has not been upgraded but I've roped in Cornholio to help build images for release via linuxCNC repository so stay tuned.

Please join me in thanking Andy for his tireless work :clap:

Look under /boot there should be a folder called broadcom, or something and config.txt will be there.
The image is not a Raspbian OS based one but based on plain Debian but with a suitable kernel.

How did you enable SPI? I didn't find it in "sudo menu-confg" and "sudo raspi-config" command not found.