Re: [CAD_CAM_EDM_DRO] Re: Raspberry Pi for CADCAM CNC? - first task .... realtime RasPi

Here's a link to a hackaday.com article with Ubunto on a beagleboard.

http://hackaday.com/2013/02/25/ubuntu-with-a-gui-on-a-beagleboard/



Scott A. Tovey
--------------------------------------------------

Truth without love is brutality,
and love without truth is hypocrisy.
-Warren Wiersbe

Tough Love is not love,
It is an act of war.
-Scott A. Tovey

--- On Fri, 8/3/13, Doug Fortune <pentam@...> wrote:

> From: Doug Fortune <pentam@...>
> Subject: [CAD_CAM_EDM_DRO] Re: Raspberry Pi for CADCAM CNC? - first task .... realtime RasPi
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Date: Friday, 8 March, 2013, 4:14 PM
>
> Running CNC on the RaspberryPi is very experimental, for DIY
> Linux
> kernel experts only, but this might give you a place to
> begin.
>
> RasPi might run LinuxCNC/EMC2 in non-realtime mode, at least
> for
> testing.   Or, non-realtime might just be
> "good enough" for your
> application.
>
>      --------
>
> There have been several attempts to get real time running on
> the RasPi,
> including Xenomai on Raspberry Pi
>
> Here are some list excerpts:
>
> http://powet.eu/2012/07/25/raspberry-pi-xenomai/
> Xenomai on Raspberry Pi
>
>
>
> >
> > Ok, I installed it on the Raspberry Pi....
> >
> > (log in as   "jed" password "jed" 
>   su to root, as realtime only runs
> > in root mode)
> >
> > ldd hello
> > ldd hello2
> >
> > needs libxenomai.so.0  on the path, so..
> > cp -v /usr/xenomai/lib/libxenomai.so.0  /lib
> >
> >
> > now, as root .....
> >  ./hello    works
> >  ./hello2  works
> >
> >               
> -------------
> >
> > problems:
> >   - its FRENCH linux
> >   - wrong keyboard,  I can't
> type  pipe "|"  or quotes
> >   - startx doesn't work to bring up a
> graphical UI
> >
> >
> >
> >
> >> http://powet.eu/2012/07/25/raspberry-pi-xenomai/
> Xenomai on Raspberry Pi
> >>
> >> He says:
> >>
> >> Xenomai is a real-time development framework
> cooperating with the
> >> Linux kernel, in order to provide a pervasive,
> interface-agnostic,
> >> hard real-time support to user-space applications,
> seamlessly
> >> integrated into the GNU/Linux
> >> environment.http://en.wikipedia.org/wiki/Xenomai
> >> <http://en.wikipedia.org/wiki/Xenomai>
> >>
> >> It has slightly different goals than Linux-RTAI,
> which tries for the
> >> absolute minimal
> latencies.   Xenomai  attempts to be
> extensible and
> >> have wide compatability.   Xenomai
> used to have a RTAI compatability
> >> skin but apparently this is buggy and
> deprecated.   Speedwise RTAI is
> >> best followed by xenomai followed by RT_PREEMPT.
> >>
> >> if you just want to try xenomai here is my latest
> image (for 8GB HDSC
> >> card)
> >>
> >> wget -c powet.eu/raspberrypi/xenomai.img
> >>
> >>
> >>
> >>     Username: jed Password: jed
> >>
> >> SHA-1    
> bb71b783d3d20edd58287eb1b0bf49bd5d9007de
> >>
> >>
> >> http://www.raspberrypi.org/phpBB3/viewtopic.php?f=41&t=12368
> >>
> >> I created a patch to get the Raspberry Pi to
> compile and work with
> >> the Xenomai 2.6.1 real-time framework with Linux
> 3.2.21, which I am
> >> sharing here with everybody.
> >>
> >> After doing some minor testing, it seems to be
> running fine. Keep in
> >> mind that I've never done Linux kernel development
> before, so it
> >> could be that what the code does is wrong is some
> way, or could be
> >> improved. I welcome any suggestions or fixes!
> >>
> >> Depending on the kernel configuration, the patch
> will use one of two
> >> clock sources for updating the timestamp counter.
> If power management
> >> is enabled, the 1MHz System Timer will be used. If
> power management
> >> is disabled, the ARM Timer, configured to run at
> 250MHz, will be used
> >> instead. Keep in mind that the ARM Timer's clock is
> derived from the
> >> system clock. Since power management can
> dynamically change the
> >> system clock, the ARM Timer is only used if power
> management is
> >> disabled. See section 14 of the BCM2835 ARM
> Peripherals
> >> <http://www.raspberrypi.org/wp-content/uploads/2012/02/BCM2835-ARM-Peripherals.pdf>
>
> >> guide for more details.
> >>
> >>
> >>
> >
>
>
>
> [Non-text portions of this message have been removed]
>
>
>
> ------------------------------------
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