LayerscapeのトピックRe: High Resolution Timers with LS1021a not reachable

High Resolution Timers with LS1021a not reachable

janbrand — Fri, 18 Dec 2015 11:17:11 GMT

Hello!

I want to check realtime-time-functionality with the LS1021a using the PREEMPT-patch:

3.12.19-rt30 #1 SMP PREEMPT RT Thu Dec 3 12:22:32 CET 2015 armv7l GNU/Linux

The tool cyclictest give's a warning at startup: "WARN: High resolution timers not available" and the timings are bad. In the kernel-config the high resolution timers are selected. What could be the problem?

Best regards

Jan

Re: High Resolution Timers with LS1021a not reachable

lunminliang — Mon, 21 Dec 2015 07:05:42 GMT

Hello Jan Brand,

Please use the latest SDK 1.9 for this.

PREEMPT_RT is not supported in SDK1.7 with component of Linux 3.12.19, for the target LS1021A.

The information is available in the information center:

https://freescale.sdlproducts.com/LiveContent/web/pub.xql?c=t&action=home&pub=QorIQ_SDK_1.9&lang=en-US#addHistory=true&f…

Have a great day,
Lunmin

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Re: High Resolution Timers with LS1021a not reachable

janbrand — Mon, 21 Dec 2015 07:50:24 GMT

Thank you for youre reply.

Unfortionaly I'm working with PTXdist - isn't there an available patch or what else for the high resolution timers for linux kernel?

Best regards,

Jan

Re: High Resolution Timers with LS1021a not reachable

lunminliang — Tue, 22 Dec 2015 06:24:31 GMT

Hello Jan Brand,

Below are patch of RT for LS1021A in SDK1.9 release:

sdk/linux.git - Freescale PowerPC Linux Tree

Lunmin

Re: High Resolution Timers with LS1021a not reachable

janbrand — Tue, 22 Dec 2015 09:07:21 GMT

Thank you, i will try...

Best regards,

Jan

Re: High Resolution Timers with LS1021a not reachable

janbrand — Tue, 22 Dec 2015 15:59:05 GMT

Hello,

compiling the kernel with the patches was succesfull. The two patches seem to have not solved the problem. Cyclictest is still saying "WARN: High resolution timers not available". Maybe the issue is elsewhere?

Best regards,

Jan

Re: High Resolution Timers with LS1021a not reachable

lunminliang — Fri, 25 Dec 2015 06:54:45 GMT

Hello Jan Brand,

Is it possible to use our kernel released in SDK? It's a pity we do not have tech support for PTXdist, sorry for this.

Lunmin

Re: High Resolution Timers with LS1021a not reachable

janbrand — Fri, 08 Jan 2016 08:13:33 GMT

Hello lunminliang,

yes that is possible! I use the kernel from SDK 1.9. The high resolution timers are integrated, thanks for your advice. The kernel works with the RFS from PTXdist and so for the first time i will use this as a workaround. Will there be a support for PTXdist in future?

Jan