Raspberry Pi 4

thankyou ..... Iwill try tomorrow (side note - on a third image burn test it would run once and then quit from a reboot as opposed to second round that quit after power down/up. I don't fully understand the iface eth0 inet static above but I will look it up - sounds like as you first suggested I have changing ip address issues.

Below is latency-histogram from my RPi4. I think its usable, but I've seen better posted here.

I did this while running running remote desktop over the on board WiFi. Probably not the best thing. When I actually start using LinuxCNC I will have a dedicated display and keyboard.

I'm using the on board LAN to connect to the 7i92. I've heard that the onboard WiFi can increase latency. I still want internet connectivity.

So, the question is, what's the recommendation for a USB LAN dongle? Traffic on this LAN connection should be light, and if necessary, unused while LinuxCNC is active.

Hello
I write the image for the RPI4 from the LinuxCNC Homepage to the card.
When I Start the rpi I get this error: => see picture
Then it automatically restart an start normal
What is the problem ?

it means that your CPU doesn't support hardware virtualization

help.ubuntu.com/community/KVM/Installation

Not a LCNC problem. Ask the Rpi4 Linux devs.
github.com/raspberrypi/linux/issues/2299

Do they use different CPU for the rpi4 ?
Or does all user with an rpi4 have this problem (with this Image from the LCNC HP) ?

I think you just need to disable KVM (or use a kernel that has it disabled)
The warning is harmless