Update frequency of Time Base reg?

[Chris Friesen]

Segher Boessenkool wrote:
>> I'm looking for information about the update frequency of the Time 
>> Base register
>> for the latest dual G5 Powermac and Xserve models.
>> By the way, what is the best way to find this kind of information?
> 
> 
> Look in the device-tree.

Look where in which device tree?

dmesg shows it, but I wasn't aware of any reliable way to get it from userspace 
on all ppc boxes.

Chris