finding out the processor frequency

[Josh Boyer]

On Thu, 6 Sep 2007 13:43:08 -0500
Scott Wood <scottwood at freescale.com> wrote:

> On Thu, Sep 06, 2007 at 02:24:30PM -0400, Leisner, Martin wrote:
> > What exactly do we mean by "timebase"?
> > 
> > There a symbol in arch/powerpc/time.c:ppc_proc_freq which looks like the
> > processor frequency (derived from the dts).  But its not exported.
> > 
> > There's also ppc_tb_freq.
> 
> The timebase is the rate at which the timebase and decrementer registers
> tick.  It is not the same as the CPU core frequency.

Unless your timebase and decrementer clock source is tied to the CPU
clock. :)

So it depends on the board, and it can even depend on how the board is
initialized.  Some boards can change the timebase clock source on the
fly.

josh