System Clock runaway on Xilinx platform

Stephen Neuendorffer stephen.neuendorffer at
Thu Feb 7 11:10:18 EST 2008

The processor is an integer factor faster than the bus, unless you're
doing something really unusual.  Are you sure that's not 300 and 150?

175/150 = 1.16, which might be the difference you're seeing?


> -----Original Message-----
> From: at
> at] On Behalf Of khollan
> Sent: Wednesday, February 06, 2008 11:42 AM
> To: linuxppc-embedded at
> Subject: System Clock runaway on Xilinx platform
> Hi all,
> Thanks for the help so far!
> I'm now running linux 2.6.21 on my custom virtex 4 board modeled after
> ml410.  The cpu clock is 300MHz and the PLB bus is 175MHz.
> My question is which clock is the linux system clock that keeps track
of the
> date derived from?  I set my date with rdate -s at boot
> then compare with the date command and rdate -p and they
> off by 20 or so seconds even just after a few minutes, this trend
> and it will be off by a day after a few hours.  I think I just don't
> something defined correctly but I can't figure out which.
> Thanks
> Kevin
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