Functional testing of mainline vchiq driver

[Phil Elwell]

On 26/10/2016 09:07, Stefan Wahren wrote:
> Am 26.10.2016 um 09:50 schrieb Phil Elwell:
>> On 26/10/2016 00:22, Michael Zoran wrote:
>>> OK, I was able to boot a stock upstream kernel on a RPI-2.
>>> The issue is the __overrides__ is needed.
>> You don't need the override/parameter provided the value of the
>> cache-line-size property is correct - 32 on BCM2835, 64 on BCM2836 and
>> BCM2837.
>
> Thanks for the clarification. I don't believe that the __overrides__
> fix the problem for me, because i have a Raspberry Pi B so the 32
> should be correct.
> Could you please explain which cache line size this property should
> describe (VPU, ARM, L1, L2, ...)?
It describes the granularity of the ARM's cache flushing and
invalidation as seen by the VPU, i.e. the ARM L2 cache line size.
> I guess this property shouldn't be exposed via DT or at least at a
> different place like cpu node.
It certainly could - I prefer to add custom properties to device nodes I
control, but a cpu property would be more logical.
>>
>>>                  vchiq: vchiq at 7e00b840 {
>>>                          compatible = "brcm,bcm2835-vchiq";
>>>                          reg = <0x7e00b840 0xf>;
>>>                          interrupts = <0 2>;
>>>                          cache-line-size = <32>;
>>>                          firmware = <&firmware>;
>>>                  };
>>>     };
>>