On Friday 22 June 2018 11:39:55 John Dammeyer wrote:

> 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

<"linux-rt-users" <linux-rt-us...@vger.kernel.org>

Subscribe to that list. Itd a front row seat to the linux rt kernel 
working group.

You aren't looking very hard John. I have built the kernels that are 
posted to the above list on a rock64, intended to run on that rock64, 
but could not locate the info to let me install it on a u-boot system. 

It takes about an hour using a usb3 attached drive for workspace. Un 
forch, the drive died and took all that with it, bumming me seriously 
out.

I may yet at some point, see how long it takes to build on an rpi3b. But 
given the rpi's internal usb-2 bottleneck speed, likely a day or so.

I am looking around for a usb2-sata adapter and I'll try it on a 60 GB 
SSD. The usb spinning rust drive redefines slow, gotta be something 
faster about.

> > -----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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-- 
Cheers, Gene Heskett
--
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page <http://geneslinuxbox.net:6309/gene>

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