Raspberry Pi 4 Tutorial - fatal error

Definitely do the cmdline thing, it brought my servo thread to under 50,000 with 6 gears running.


Might as well post my results. i tried doing the install from the uspace but couldnt get the rt kernel to go. at this line "make bcm2711_defconfig" i was getting an error about over riding or something with the kernels and didnt spend enough time on it (being new to rpi, please bear with me),I am also not sure where i am looking in the menuconfig to select the preempt kernel. I opted to use the premade image andy posted here (even though I love an openbox from scratch, i will try again later), forum.linuxcnc.org/18-computer/36879-raspberry-pi-4?start=70 , and resumed my install from the rpi-emc page and everything seems to be working.I bought one of those new mesa cards ,the 7c81, I am also new to mesacards. I would appreciate help when the time comes in regards to the mesacards as well if you linuxcnc gurus dont mind

I had done the step with sudo nano /boot/cmdline.txt but didn't get EVERYTHING on one line. I fixed that and now I am getting:

Running 6 glxgears
Servo thread (1ms): 27207
Base thread (25us): 32552

I did get the message "Unexpected realtime delay on task 0 with period 25000"

It would be useful if those currently experimenting with Raspberry Pis could try out this
github.com/LinuxCNC/linuxcnc/issues/643#issuecomment-529105353

(I am going to find it hard to find the time)

I have some spare SD cards I'll give it a try.

John

How did it go?

I think I got it to compile but not to run. I was attempting it a RIP. I'm sure it is all me though I'm just learning how to do all of this. I am going to have another go at it now that I have completed some honey-do tasks that were put upon me.