From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: Hidde Verstoep <hverstoep@e2mtechnologies.eu>
Cc: "xenomai@xenomai.org" <xenomai@xenomai.org>
Subject: Re: [Xenomai] WARNING: at arch/arm/kernel/ipipe.c:157 ipipe_set_irq_affinity+0x47/0x70()
Date: Mon, 1 Dec 2014 19:54:21 +0100 [thread overview]
Message-ID: <20141201185421.GD28038@hermes> (raw)
In-Reply-To: <CAD3Bbm+rTuzSWJ+ikNMDZgi3CW7yO4wUgawQco+C4ChG-rLj8A@mail.gmail.com>
On Mon, Dec 01, 2014 at 12:35:18PM +0100, Hidde Verstoep wrote:
> > By the way.. When compiling kernel for Xenomai, I am advised to
> > turn off CPU Frequency scaling "as it is known to cause
> > trouble". When enabled I could inspect and set the CPU clock
> > frequency by the "cpufreq-info" and "cpufreq-set". These tools
> > are no longer available and I don't find any settings in the
> > menuconfig.
> >
> > What is the default BBB CPU frequency when frequency scaling is turned off?
>
> From my experience with the BBB and Xenomai:
> The default CPU frequency with frequency scaling turned off is 600
> MHz. This was not acceptable for me since the BBB supports 1000
> Mhz.
Well, to what frequency does u-boot set the processor? Because if
u-boot sets the frequency to 600 MHz and Linux does not change it,
chances are that if you set the frequency to 1 GHz in u-boot, Linux
will not change it either. This is what I do on the omap3 board I
use: set the frequency to 720 MHz in u-boot.
--
Gilles.
next prev parent reply other threads:[~2014-12-01 18:54 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-01 5:54 [Xenomai] WARNING: at arch/arm/kernel/ipipe.c:157 ipipe_set_irq_affinity+0x47/0x70() Terje Frøysa
2014-12-01 7:34 ` Gilles Chanteperdrix
2014-12-01 8:26 ` Terje Frøysa
2014-12-01 8:50 ` Gilles Chanteperdrix
2014-12-01 11:06 ` Terje Frøysa
2014-12-01 11:16 ` Gilles Chanteperdrix
2014-12-01 11:35 ` Hidde Verstoep
2014-12-01 11:39 ` Terje Frøysa
2014-12-01 18:54 ` Gilles Chanteperdrix [this message]
2014-12-01 15:19 ` Lennart Sorensen
2014-12-01 15:30 ` Gilles Chanteperdrix
2014-12-01 23:35 ` Lennart Sorensen
2014-12-01 23:37 ` Gilles Chanteperdrix
2014-12-01 23:50 ` Lennart Sorensen
2014-12-01 23:55 ` Gilles Chanteperdrix
2014-12-01 23:57 ` Lennart Sorensen
2014-12-01 15:43 ` Terje Frøysa
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