Hanging in the Delay loop

[Gabriel Paubert]

On Tue, 10 Oct 2000, Dan Malek wrote:

>
> clark at esteem.com wrote:
>
> >         Does anybody know why a machine would hang in the Calibration Delay
> > Loop just before it spits out the BogoMIPs rating.
>
> This happens if the decrementer isn't running.  Is this an 8xx or 8260?
> They both have the ability to disable the timebase, which includes the
> decrementer (other processors don't do this).  An ICE often does more
> than you know, which could be an unexpected register setting that causes
> this to happen.

Hmmm..., actually all processors have a TBEN pin (except the 601) and many
chipsets have a register which is designed to control this. This would be
very useful to synchronize timebases on SMP systems, the problem is to
write support code for all platforms (is there a way to control this pin
on SMP G4).

	Regards,
	Gabriel.


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