I believe the BeagleBone Black MachineKit uses one of the RT kernel 
modifications.  However, it's the two PRU processors inside the Beagle that 
make it possible to run stepping motors and decode encoders.

It actually boggles my mind that decades after say OS-968K, VRTX-86 RTOS or for 
that matter the RTOS I wrote in University that something like Linux doesn’t 
have a  RT Kernal and that if you didn’t want RT capability that then you'd 
have flavours off the main line for that.

Perhaps so much of the internal Linux code would be broken with badly written 
code that has priority inversions etc. and would therefore be broken that it 
continues down the path of non-real time.

Simply mind boggling.

John


> -----Original Message-----
> From: andy pugh [mailto:bodge...@gmail.com]
> Sent: June-22-18 5:47 AM
> To: Enhanced Machine Controller (EMC)
> Subject: [Emc-users] Raspberry Pi PREEMPT-RT
> 
> I haven't seen this mentioned here. It seems that it might be relevant:
> 
> https://www.raspberrypi.org/forums/viewtopic.php?t=206747
> 
> --
> atp
> "A motorcycle is a bicycle with a pandemonium attachment and is
> designed for the especial use of mechanical geniuses, daredevils and
> lunatics."
> � George Fitch, Atlanta Constitution Newspaper, 1916
> 
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