[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH] xen/arm: Propagate clock-frequency to DOMU if present in the DT timer node
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 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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