[linux-sunxi] Re: [PATCH 4/4] Add arch count timer node in dts for Allwinner A20(sunxi 7i).

[Ian Campbell]

On Thu, 2013-09-12 at 15:57 +0100, Mark Rutland wrote:

> > +			interrupts = <1 13 0x308>,
> > +				     <1 14 0x308>,
> > +				     <1 11 0x308>,
> > +				     <1 10 0x308>;
> > +			clock-frequency = <24000000>;
> 
> If at all possible, your bootloader should set CNTFREQ, and
> clock-frequency should only be used as a last resort when it's
> impossible to get it to set CNTFREQ. It's not possible to set CNTFREQ
> from the non-secure side, so guests (which might not be Linux, and might
> not handle DT in the same way) may see a completely wrong frequency
> value.

https://groups.google.com/forum/#!topic/linux-sunxi/56Wj1IT-pKU

Ian.