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Taking into account that a new version of RaspiOS has been released
(www.raspberrypi.com/software/operating-s...spberry-pi-os-64-bit)
Release date: December 5th 2023
System: 64-bit
Kernel version: 6.1
Debian version: 12 (bookworm)

and the new Preempt_RT patch
mirrors.edge.kernel.org/pub/linux/kernel/projects/rt/6.1/

I prepared a new image for the Raspberry Pi5

Linux raspberrypi5 6.1.65-rt16-v8-16k-elv_rt+ #1 SMP PREEMPT_RT Thu Dec 7 13:43:31 CET 2023 aarch64

in which I installed a version of linuxcnc_2.10.0~pre0_arm64
forum.linuxcnc.org/9-installing-linuxcnc...xcnc?start=20#287208

This image can be downloaded from here
drive.google.com/file/d/16kKamxMKPdYAeJp...KLf/view?usp=sharing
At first glance everything seems to work regularly and the lowest value that did not show the "Unexpected realtime delay" message was
latency-test 12000

The values ​​are much better than the version here:
forum.linuxcnc.org/9-installing-linuxcnc...-pi-5?start=0#285243
 

Well ...
I added the network-manager-gnome package in order to get the GUI nm-applet.

I also added the raspberry pi repository 
deb archive.raspberrypi.org/debian/ bookworm main
so I could get raspi-config

isolcpus 2.3
Max latency during a short test was about 15us
I hooked it up to a MESA 7i76s and just worked. So no network latency issues (yet).
I'll let it run for a while.

The 640x480 display limit is a bugger. Any idea how to fix that?

It does run pretty warm. 
Processor utilization running gcode in Axis is around 15% for cores 1 and 2
 

thadwald wrote:

By the way, DigiKey has over 2500 pi5 4GB in stock. $60 plus shipping.

 

Unless you are going to use Ethernet or prepared to wait for the hm2_rspi driver to get rewritten I wouldn't grab one right away. And due to the need to really run a cooler, fitting to the 7c81 is going to need a bit of ingenuity.

Yep the display is an issue.
I started with downloads.raspberrypi.com/raspios_arm64/...ookworm-arm64.img.xz

Installed XFCE desktop, used the config to use X instead of wayland then built a RT kernel to suit.

By the way, DigiKey has over 2500 pi5 4GB in stock. $60 plus shipping.

Thanks.
First thing I notice is display is limited to 640 x 480 and I cannot change it via the Display GUI.

usr cnc
pw  cnc

thadwald wrote:

After booting this image, I am greeted by the Debian login screen. What is the username and password?

3 pages back on this topic:
forum.linuxcnc.org/9-installing-linuxcnc...pi-5?start=20#285774

rodw post=285989 userid=20660

Well there is an image here crying out for testing. Its based on the official 2.9.1 image for the PI 4B just compiled for the different BCM2112 board.It should work based on cornhlio's comments.

drive.google.com/file/d/1H_q0Ra-27ZDOhqu...x1f/view?usp=sharing

After booting this image, I am greeted by the Debian login screen. What is the username and password?

You'll have to dive into the RP1 as the IO has been moved off the BCM2712, the RPi4 had the IO on the BCM2711.

I had a bit of play but decided to move to another setup.

linuxcnc.org/docs/html/code/building-linuxcnc.html

datasheets.raspberrypi.com/rp1/rp1-peripherals.pdf

datasheets.raspberrypi.com/bcm2711/bcm2711-peripherals.pdf

github.com/raspberrypi/utils/tree/master/pinctrl

It would be great if you could point me to some appropriate build instructions. I can look at the driver.  I'm plenty familiar with building Linux, but I'd love to have a pointer to the exactly correct repos.  I haven't easily found this on this forum yet.

Should be ok.
Haven’t tested it myself.

Hi Cornholio, Stupid question- Lack of I/O support wont affect the 5's ability to run an ethernet card? (I have one on the way, still trying to decide what machine i want to use to drive it) Just my luck that there would be some weird conflict that means its a no-go.

The driver will need a rewrite, more than likely, due to the I\O being moved to the RP1 chip. So if you want to get into some driver coding go for it.

I can spend some time on this. Can we start a DM conversation? I've built Linux deployments before.