From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: Xenomai help <xenomai@xenomai.org>
Subject: Re: [Xenomai-help] IRQ-Latency when in idle State on ARM
Date: Fri, 05 Jun 2009 20:09:07 +0200 [thread overview]
Message-ID: <4A295F43.9090904@domain.hid> (raw)
In-Reply-To: <200906051932.16827.karl.tyss@domain.hid>
Karl Tyss wrote:
> Right before the cpu is put to sleep by cp15 the I-cache is being disabled in
> the idle task. I took this part out. So I leave the I-cache enabled when the
> cpu goes into the idle mode. I suppose that there is a reason for disabling
> the cache. I will ask my wise ARM book on monday. If this issue doesn't belong
> here (xenomai list) just say a word :)
Yes, you probably can not do that. You will find the answer in the
documentation for the arm926EJS core, since this file only concerns this
core.
On the other hand, as Bosko suggested, if you use the nohlt kernel
option, you will avoid the idle function altogether, and the I-cache
will not be disabled then re-enabled.
--
Gilles.
next parent reply other threads:[~2009-06-05 18:09 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <4A294F59020000F80002DC0E@msw.eppendorf.de>
[not found] ` <200906051932.16827.karl.tyss@domain.hid>
2009-06-05 18:09 ` Gilles Chanteperdrix [this message]
2009-06-05 19:08 ` [Xenomai-help] IRQ-Latency when in idle State on ARM Gilles Chanteperdrix
2009-06-06 17:38 ` Karl Tyss
2009-06-06 18:00 ` Gilles Chanteperdrix
2009-06-05 17:36 Karl Tyss
[not found] <4A28F029020000F80002DB14@domain.hid>
[not found] ` <4A28FAD4020000F80002DB27@domain.hid>
2009-06-05 9:00 ` Karl Tyss
2009-06-05 9:31 ` Gilles Chanteperdrix
2009-06-05 9:56 ` Karl Tyss
2009-06-05 11:10 ` Gilles Chanteperdrix
2009-06-05 13:42 ` Gilles Chanteperdrix
2009-06-05 14:09 ` Karl Tyss
2009-06-05 14:16 ` Gilles Chanteperdrix
2009-06-05 14:17 ` Gilles Chanteperdrix
2009-06-05 14:49 ` Karl Tyss
2009-06-05 15:01 ` Gilles Chanteperdrix
2009-06-05 12:13 ` Bosko Radivojevic
2009-06-08 7:31 ` Karl Tyss
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