Functional testing of mainline vchiq driver

[Phil Elwell]

On 31/10/2016 10:42, Stefan Wahren wrote:
> Phil Elwell <phil at raspberrypi.org> hat am 31. Oktober 2016 um
> 11:28geschrieben:
>> That's because the firmware doesn't read the cache line size value from
>> the DTB - it knows which chip it is running on, and hence the correct
>> value - so forcing an incorrect value for the ARM causes a discrepancy.
> In case VPU and ARM core need the same value i suggest to request the firmware
> about that.
> I assume there is no possibility to request the cache line size directly.
> So we need to decide based on something like RPI_FIRMWARE_GET_BOARD_MODEL?
The firmware already tells the ARM the correct value by ensuring it has
an appropriate DTB file. Are you really suggesting adding a method to
query at runtime a property of the hardware which cannot change?

I thought Device Tree was meant to contain static device configuration
information like that. The fact that there isn't already a
cache-line-size property on the CPU nodes seems like an oversight.