[LITMUS^RT] Litmus-rt on Raspberry Pi

[Sisu Xi]

Hi,

I happened looked into this before. Raspberry Pi don't come with the rdtsc,
so the code in Litmus^RT that's related to timing recording will need to be
changed.

See:
http://blog.remibergsma.com/2013/05/12/how-accurately-can-the-raspberry-pi-keep-time/

*Rasberry Pi’s clocksource*
The Raspberry Pi does not ship with a TSC nor HPET counter to use as
clocksource. Instead it relies on the STC that Raspbian presents as a
clocksource. Based on the source code, “STC: a free running counter that
increments at the rate of 1MHz”. This means it increments every microsecond.

Hope this helps.

Hi, Glenn:

For Litmus on Cortex-A9 and ARM11, do you have any reference/publications
to those works?

Thanks.

Sisu



On Wed, Nov 6, 2013 at 2:55 PM, Glenn Elliott <gelliott at cs.unc.edu> wrote:

> On Nov 6, 2013, at 3:20 PM, Ríad <riad.nassiffe at gmail.com> wrote:
>
> > Hi,
> >
> >      I would like to known if somebody had already compiled the
> litmus-rt for a raspberry pi device?
> >
> > Thanks and Regards,
> > --
> > Ríad Mattos Nassiffe
> >
> > _______________________________________________
> > litmus-dev mailing list
> > litmus-dev at lists.litmus-rt.org
> > https://lists.litmus-rt.org/listinfo/litmus-dev
>
> I know that Litmus has been used on several Cortex-A9 implementations and
> an ARM11 MPCore development board.  We routinely use Litmus on a Tegra3
> platform here at UNC.  However, I’m not sure if Litmus will compile
> “out-of-the-box” for all of these ARM platforms.  I know for at least two
> of the Cortex-A9 boards, the developers had to take the Linux kernel source
> code distributed by the board manufacturers and rebase Litmus on top of
> it—the boards required Linux kernel changes that hadn’t yet appeared in
> mainline.  However, this situation may have changed when Litmus was rebased
> on Linux 3.10.5.  There’s no harm in giving it a try!  I’d like to hear if
> you can get it working on Raspberry Pi and any problems you run into.
>
> -Glenn
> _______________________________________________
> litmus-dev mailing list
> litmus-dev at lists.litmus-rt.org
> https://lists.litmus-rt.org/listinfo/litmus-dev
>



-- 
Sisu Xi, PhD Candidate

http://www.cse.wustl.edu/~xis/
Department of Computer Science and Engineering
Campus Box 1045
Washington University in St. Louis
One Brookings Drive
St. Louis, MO 63130
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