Re: [Xen-devel] [PATCH] xen/arm: Propagate clock-frequency to DOMU if present in the DT timer node

[Julien Grall <julien.grall@xxxxxxxxxx>]

On 03/06/2015 23:45, Chris (Christopher) Brand wrote:
> Hi Julien,
Hi Chris,

> > When the property "clock-frequency" is present in the DT timer node, it means 
> > that the bootloader/firmware didn't correctly configured the
> > CNTFRQ/CNTFRQ_EL0 on each processor.
> I will test this patch, but it doesn't apply cleanly to the version of Xen I'm 
> currently using, so I need to update that first.
It's based on the latest staging.

> I also looked at whether it would be possible to set the CNTFRQ register in the 
> other cores when they come up. Eventually, I think we should do this in the 
> (platform-specific) PSCI code. There doesn't seem to be a suitable hook in the 
> platform-specific Xen code - it looks like all the code there related to 
> bringing up secondary cores runs on the primary.
CNTFRQ is read-only in the hypervisor when the platform supports EL3 
(i.e secure monitor).
So it has to be done either by the bootloader or by the firmware.

Regards,


--
Julien Grall

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