System Clock runaway on Xilinx platform

[Grant Likely]

On 2/6/08, Kevin Holland <khollan at 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.