Raspberry Pi 4

Should I make a LCNC SD card image with LCNC 2.8 already configured to run a DLP/LCD printer using the Rpi4? I'm not sure how simple this has to be made for hobbyists to be able to use it.

i think that would be fine

i have installed it with JT's

gnipsel.com/linuxcnc/uspace/rpi4-rt.html

my question remains how to manage GPIO configuration in detail?

You don't have to install using all the steps at JT's site anymore. There is a full working SDcard image on the wiki now.

LinuxCNC 2.8.0 Raspberry Pi OS based on Debian 10 Buster
www.linuxcnc.org/iso/linuxcnc-2.8.0-pi4.zip

Raspberry Pi 4 Uspace compatible with Mesa Ethernet and SPI interface boards.

A StepConfig app could be written for Rpi4.

thank you Bari, what does this exactly mean, please, a StepConfig app could be written for Rpi4?

For x86 we have linuxcnc.org/docs/html/config/stepconf.html
Stepconf is a program that generates configuration files for LinuxCNC for a specific class of CNC machine: those that are controlled via a standard parallel port, and controlled by signals of type step & direction.

Stepconf is installed when you install LinuxCNC and is in the CNC menu.

A similar app could be written for the Rpi to configure GPIO's and test them.

Yes, thank you, this Stepconf i know.

I am looking for something like

erste.de/rasPiCat.html

how to configure Raspberry PI4 GPIO to use it as it is like the parallel ports, say ini and hal configuration