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Docs on github linked on that topic, at the very start of it
remora-docs.readthedocs.io/en/latest/har...ring-to-raspberry-pi

i just order some shift level converter can use whit rpi gpio can make out 3,3V to 5V all gpio pin, and then one optocoupler board can add rpi inputs safe, 5V in to 3,3V to rpi,
then can add all STEP,DIR,Enable pins traight to drivers DM556 i used normal,
but problem is were have image can use rpi3, not need be fast, this come only dovetail jig tool make long plank top dovetails not more, no need be full cnc, working area has need only XY axis, what has moved Z axis to 90 degree and spindle have horicontal not normal vertical system. simple hardware but image need old rpi3 board first.

forum has made help any peoples how do linuxcnc to raspberry etc other linuxcnc problems, forum need help and teach all newbie how make somethink. my own language not have forum and maybe not many peoples who can help newbie user, Finnish language need be. but i believe not have many peoples. i has build many many cnc machine before but now think need one small simple dovetail tool made whit my old rpi3 board but search google lot and not have any image what can use, all has only lot problem code and install and what have kernel compile or what need doing not understand and know what need doing. need only image what can install to SD card simple not more need doing. same than normal computer can install linuxcnc 2,8,4 my daily used cnc machine, easy simple fast install and setting workig. no problems, why not has made normal image to SD card and can use similar than computer this working. not big job all computer engineer gurus and nerds. all not have nerd and understand linux code but lot have peoples who want use rpi3 cnc.

masawee wrote:

this link has only pi 4 images, not any oi 3. what need doing can use pi 3 and linuxcnc, what is patch and how need doing, or what need doing, not understand , ready to install pi 3 image only need how need patch or what this mean and how change kernel if need no understand anything linux and code, secret engineer language all.

This is getting silly, 3 times you post, I did try to help you with your first post. You didn't say you were using RPi3B to begin with. I did politely ask what your native language was, so we could find someone to help you, as it quite clear English is not your first language.
First of all I think you need to find some Linux info in your own language, this forum is not here how to teach people how to use Linux takes way too much time. Anything Linuxcnc we can help.

what this all code have ??? not understand anything. have linuxcnc image what can add to SD card and run rpi3 ready to use, i not understand this all secret code anything, what need doing or how doing and were doing.

need only image who working and can run rpi 3 board and connect stepper drivers DM556 to rpi and run nema 23 motors. whit linuxcnc.

this link has only pi 4 images, not any oi 3. what need doing can use pi 3 and linuxcnc, what is patch and how need doing, or what need doing, not understand , ready to install pi 3 image only need how need patch or what this mean and how change kernel if need no understand anything linux and code, secret engineer language all.

not understand what is compile and how need do ? or have ready to use image to rpi3.
i looking make rpi3 linuxcnc small cnc my son.
or how kernel need use or how can change kernel or what need doing. too hard all linux system but have only what can use good whit linuxcnc and rpi3 board. not want buy old computer and paraller port use this.

I've just been down that road (at least one of them):

forum.linuxcnc.org/9-installing-linuxcnc...aughter-board#339636

johnB wrote:

I wonder, is there a Raspberry HAT that can direct interface with a stepper driver ?

Thanks
Jonh.

www.instructables.com/LinuxCNC-on-Raspbe...i-With-GPIO-Control/

Some advice regarding chatgpt and AI in general for help. Currently it is not a good idea asking about Linuxcnc, many many times it gives answers that make no sense and will not work.

Hello friend, I will try to help as much as I can.
First I would like to ask what language is best for you ? I am asking this as I can only speak English. It is my hope that there maybe someone that speaks your native language and maybe able to help.

For the image the most recent can be found here:
forum.linuxcnc.org/9-installing-linuxcnc...mages?start=0#338181

Byte2Bob help can be found here:
forum.linuxcnc.org/9-installing-linuxcnc...aughter-board#339613

I hope this is a start. I will do as much as I can to help.
All the best
Rob

you can use this bob directly on the RPI GPIO's:

www.amazon.de/DollaTek-5-Achsen-CNC-Brea...reiber/dp/B07PNDXZQK

only need to build an adapter cable, there are no 5v comming out of the bob on the db25 side, no risk to damage the gpio's.

NOT can found, no have, only can use paraller port hat and paraller port breakoutboard, if want rpi use stepper drive direct need voltage level shifter board, 3,3V to 5V 8 pin converter, rpi use 3,3V and convert output can use 5V stuff, etc, stepper motor driver, step and dir pin, and enable pin. and same can bi -directional board use input too 5V sensors,limitSW etc convert to 3,3V and use whit rpi. same output relays etc, cn use gpio pin 3,3V convert to 5V and then use trnsistor who connect to relay on/off relay. gpio not handle lot current about 2mA out and in little more, or burn input/output port. thats why need converter and optocoupler to input current resistor need too, stuff not broken rpi. and shift level converter and resistor output no burn output pin, if have lot money waste buy ower price protoneer rpi cnc shield 100€ horriple price, or cheapen option rpi paraller port hat 35€ and cheap chinese 10€ breakoutboard. i think have possiple use shift level converter to input/output gpio pins and optocoupler cheap in-out system direct to driver and all limit,home,probe,etc inputs, opto input pins and shift level converter output pins, i hope working , i need test if has order all parts, but i not understand what software need do, image were is linuxcnc and how working whit paraller port hat if use, or what need hal file doing or other, programs and code not my job ,not understand anything.

I have a skr1.4 turbo board. Would like to use ethernet to connect it to a pc instead of using a Raspberry Pi. Did see the demo of it working. Searched through the threads here and couldn't find how to wire and configure it.

I recently struggled with getting my Raspberry Pi 5 to accept the estop input. On this forum, I asked the following question. 
I would like to know how to connect the GPIO to LinuxCNC’s E-Stop chain.
From this, I received some tips and advice that pointed me in the right direction, but no working answers. I used a YouTube video on installing LinuxCNC on a Raspberry Pi, but the advice was old and no longer valid. My assessment at this time is: If someone were to attempt what I attempted, I don't see a mechanism for them to follow in my footsteps because they would unlikely use the search term "estop" or "GPIO" to search the forum. So I would like to put together what I learned to make this happen. 
1. Not many users of this form are using Raspberry Pi computers - they have some limitations
2. The Byte2Bot hat does not create a parallel port. Rather is isolates the GPIO pins on the computer board and brings them out using a DB25 connector that is just like the parallel port on your Mesa card or computer. This allows you to use a parallel port breakout board. While a parallel port dedicates PIN2 to a dataline, with the output from a Raspberry Pi, one needs to refer to what is the GPIO line connected to that pin which is GPIO9 in this example. In your setup, you cannot refer to PIN2; you must only refer to which GPIO line it is. When someone sends you suggestions that look like  "=> hal-gpio.PIN12.out" - it won't help you. 
3. There are folks who can help you. The most valuable was the user "unkown". unknown provided this:
Below is a thread that is more or less an index for the Main RPi4/5 thread.
forum.linuxcnc.org/38-general-linuxcnc-q...l-images-only#325007
Has a section regarding GPIO and there is a working config if you follow the links.
They are there, you just have to look.
Just about everything regarding the Rpi4/5 is in this thread
forum.linuxcnc.org/9-installing-linuxcnc...official-images-only
4. The schematic offered by Byte2Bot had some notable omissions that is corrected in the Circuit3.jpg schematic from another user.
5. The eStop button should be NC (Normally Closed) - I did not correct that. The eStop button should be latching - mine is not. 
6. The *.hal file has changed significantly since the requirement of using the GPIO nomenclature
7. I have yet to control the spindle speed with the breakout board.
8. The StepConfig package in LinuxCNC is not intended for a Raspberry Pi with a hat. It is designed for a MESA board setup, which this is not. I'm not aware of a reason to use it, but it does create a *.hal and *.ini file for the machine name you select in setup.
9. If you want to search Google about eStop, do not search "Linuxcnc estop". You will fail. However, if you add the word "latch" to your query, you will have success. Don't ask. If you have a ton of experience, it may make sense. 
10.  When you submit a topic, hit the submit button and go have lunch. Nothing may happen for a while. I became impatient and hit submit again, and two instances of my topic were submitted. 11. How your question looks in the editor may not be how it looks online.12. I have more to learn.

SO
What do I have to promote the cause? If you use a Raspberry Pi 5 with a Byte2Bot parallel hat (it should be called a DB25 hat) with a parallel breakout board, you may have success with the following wiring and code.