From: "Grant Likely" <grant.likely@secretlab.ca>
To: "Kevin Holland" <khollan@daktronics.com>
Cc: linuxppc-embedded@ozlabs.org
Subject: Re: System Clock runaway on Xilinx platform
Date: Wed, 6 Feb 2008 15:52:51 -0700 [thread overview]
Message-ID: <fa686aa40802061452i78838bb0g87c99d76509c866e@mail.gmail.com> (raw)
In-Reply-To: <1202337576.20550.6.camel@kevin-laptop>
On 2/6/08, Kevin Holland <khollan@daktronics.com> wrote:
> I load with the zImage.elf, so my xparameters are set like this:
>
> #define XPAR_CPU_PPC405_CORE_CLOCK_FREQ_HZ 300000000
> #define XPAR_CORE_CLOCK_FREQ_HZ XPAR_CPU_PPC405_CORE_CLOCK_FREQ_HZ
>
> I took readings every 5 min over a 15 min period and it seems to be
> increasing by approximately 50 sec every 5 mins.
Hmm; 5 min == 300 seconds
300 - 50 == 250 seconds
300/250 = 1.2
So, timebase_period_ns is set 1.2 times faster than the actual period.
Can you confirm that the EDK frequency is actually correct? Are you
*sure* that the CPU is running at 300MHz.
Cheers,
g.
--
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.
next prev parent reply other threads:[~2008-02-06 22:52 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-06 19:41 System Clock runaway on Xilinx platform khollan
2008-02-06 20:29 ` Grant Likely
2008-02-06 22:39 ` Kevin Holland
2008-02-06 22:52 ` Grant Likely [this message]
2008-02-07 16:07 ` khollan
2008-02-07 0:10 ` Stephen Neuendorffer
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