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

["Chris (Christopher) Brand" <chris.brand@xxxxxxxxxxxx>]

Hi Julien,

>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 did try this out, and it didn't affect my results. I don't understand why, 
though :-)

What I see is that in preinit_xen_time(), the call to dt_property_read_u32() 
returns zero. When I built Xen, I set CONFIG_DTB_FILE, and looking at the 
corresponding dts file it has a timer node with a clock-frequency property. I 
know that our bootloader also creates a DTB, though, and it looks like that one 
does *not* have a clock-frequency property in the timer node, so I guess Xen 
ends up using that one somehow. CNTFRQ on core 0 (only) is also set to the 
correct frequency, so I end up with the correct frequency in my Dom0 kernel 
anyway.

I'm guessing this is me not understanding what's happening in my system rather 
than anything wrong with the patch.

Chris



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