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This is for technoligic or someone like myself to do... not for beginner From: komal <> To: Sent: Thursday, April 5, 2012 12:20 AM Subject: [ts-7000] Re: high resolution timers and real time 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 > > >  > I don't think that patch will work on the ts-7500. > > > On Mon, Apr 2, 2012 at 8:39 AM, komal <> wrote: > > > > > >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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