Raspberry Pi 4

Hi All,

It looks like the new raspberry pi 4 fix's a lot of problems I have read about for using one for linuxcnc. Mainly the addition of real time ethernet. A few questions...

1. Will the raspberry pi 4 now we a suitable choice for connecting a 7i76E or 7i92?

2. Mesa looks to have a 7C80 in development specifically for the raspberry pi, is that board going to be available anytime soon? Does this new raspberry pi effect the development?

1. It should but Ethernet performance is not known yet.

2. The RPI4 should just work with the 7C80/7C81 assuming its
SOC SPI interface is the same as the RPI3

The 7C81 _is_ available. the 7C80 still needs its inmux firmware
module support added to the hostmot2 driver

Made a quick and dirty test with 7i76E on the RPI4 4GB. It works, yes.
Can jog and run axis, didn't test more than that.
Got sveral messages that main loop took up to 0.25 seconds.
So I guess it doesn't work (so well) after all.

There are some things that can be tuned, but you should leave it running some gcode for at least an hour to see if it drops the connection to 7i76E.
If it does not drop it, there's still hope.

I seem not to have RT preempt patches, only the PREEMPT.

I'll go hunting for that.

Wait....

geneslinuxbox.net:6309/gene/Genes-os9-st...ebian-stretch-armhf/

But it is for the 3b, so might not work.
Thanks to Andy for the link.

Did not have time nor a microsd card to test that image yet.