thank you for your reply. I would really appreciate it if you can elaborate on
the solution you have mentioned. I am a Linux newbie so not very familiar with
the development process.
Thank you :)
--- In Walter Marvin <> wrote:
>
> If you don't need the serial uarts you can steal this interrupt to support hi
> res timers. Its a relitively simple kernel mod.
>
> thanks
>
> Walter
>
>
>
> ________________________________
> From: João Trindade <>
> To:
> Sent: Monday, April 2, 2012 11:22 AM
> Subject: Re: [ts-7000] Re: high resolution timers and real time
>
>
> Â
> I don't think that patch will work on the ts-7500.
>
>
> On Mon, Apr 2, 2012 at 8:39 AM, komal <> wrote:
>
>
> >Â
> >Dear Sir,
> >
> >I have recently acquired a ts-7500 board with the development kit. The SD
> >card comes with a 2.6.24 Linux Kernel. After a few days of experimenting I
> >have realized that my application (controlling a servo through PWM) will
> >require HRT and RT support which the Kernel is unable to provide (maximum
> >timer resolution I am getting on the current Kernel is 20ms).
> >
> >I am new to Linux and embedded systems development and hence I am a little
> >confused about how to tackle this problem. I do not understand what you mean
> >by applying the patches and how to apply the patch. Can i simply do it
> >on-board my board with the SD-Card. I have a windows PC with Eclipse for
> >Development.
> >
> >Any help you can provide me will be highly appreciated. Thank you.
> >
> >Regards,
> >Komal RAUF
> >
> >--- In Peter Gammie <peteg42@> wrote:
> >>
> >> Charles, any anyone interested in hrtimers:
> >>
> >> With Andrew's help I managed to build a 2.6.32.3 kernel that seems to
> >> work. Attached are a config and a patch, based on this:
> >>
> >> http://lkml.org/lkml/2009/7/22/119
> >>
> >> that enable hrtimers. I've lightly tested it on a ts7260 with 64Mb of
> >> memory. I loaded the kernel via TFTP with:
> >>
> >> load -r -b 0x00218000 -h 192.168.1.1 z
> >> exec -c "console=ttyAM0,115200
> >> ip=192.168.1.50:192.168.1.1:192.168.1.1:255.255.255.0:ts7200a:eth0:off
> >> root=/dev/mtdblock1"
> >>
> >> (i.e. no special memory options or anything.)
> >>
> >> So the routine is to apply Matthieu's patches, then this one. I expect it
> >> will apply to other kernel versions (specifically 2.6.29.6 if you want
> >> -RT) without too much bother - but be careful that the Kconfig patch
> >> applies to the right system type!
> >>
> >> As for the clock multiplexing, Charles's suggestion of using just a
> >> PREEMPT (not RT) kernel results in better behaviour under light periodic
> >> load (it doesn't flicker while running top on the console) but about the
> >> same under heavier load (scp'ing a few megabytes via ethernet). I have the
> >> CONFIG_NO_HZ (tickless) option set, which may or may not do anything in
> >> particular...
> >>
> >> So, more investigation is required.
> >>
> >> Thanks for all your help.
> >>
> >> cheers
> >> peter
> >>
> >>
> >>
> >>
> >> --
> >> http://peteg.org/
> >>
> >
> >
>
>
> --
> João Trindade   <>
> Telephone: +351 93 561 39 10
> http://cnm.tagus.inesc-id.pt/joao+trindade
>
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