Raspberry Pi 4 Tutorial - fatal error

I'm working on a tutorial for the Raspberry Pi 4B to run Mesa Ethernet cards but to my surprise the latency is much better than I thought at <30us. Anyway anyone that has a Rpi4 and wants to run through the tutorial and see if I have anything that is absolutely not clear for a Linux beginner please do.

I'm using Rasbian 10 patched with the preempt rt kernel LinuxCNC Uspace and a blank slate window manager OpenBox.

As usual the Uspace tutorials are here: gnipsel.com/linuxcnc/uspace/

JT

BigJohnT wrote: As usual the Uspace tutorials are here: gnipsel.com/linuxcnc/uspace/

JT

I have a 404 error with github.com/jethornton/7i76

Clive s wrote: I have a 404 error with github.com/jethornton/7i76

Yep forgot the e, it's fixed now.

JT

Have you tried it with the SPI cards yet? Doesn't look like the 7c80 has been officially released yet but the 7c81 seems to be available.

No, Peter is going to send me one with my next order so I can try it out. I am mainly interested in getting the Ethernet cards working well with the Rpi4 which they do. Latency is crazy low with my setup.

JT

You know that there is an experimental SD card image with most of this already done?
www.linuxcnc.org/dists/buster/2.8-uspace/