Re: [ARM:PATCH v1 1/1] Add Odroid-XU (Exynos5410) support

[Julien Grall <julien.grall@linaro.org>]

On 26/07/14 22:24, Julien Grall wrote:
>
>
> On 26/07/14 21:26, Suriyan Ramasami wrote:
>> On Sat, Jul 26, 2014 at 10:58 AM, Julien Grall
>> <julien.grall@linaro.org> wrote:
>>>
>>>
>>> On 26/07/14 17:02, Suriyan Ramasami wrote:
>>>>
>>>> Hi Julien,
>>>>
>>>> On Sat, Jul 26, 2014 at 4:28 AM, Julien Grall <julien.grall@linaro.org>
>>>> wrote:
>>>>>
>>>>> Hi Suriyan,
>>>>>
>>>>>
>>>>> On 26/07/14 08:26, Suriyan Ramasami wrote:
>>>>>>
>>>>>>
>>>>>> I also noticed that in some instances of "xl create" it does bring up
>>>>>> domU with 4 cpus as mentioned in the domU.cfg file, and in those
>>>>>> instances the domU boots up.
>>>>>>
>>>>>> Is this some kind of bug?
>>>>>
>>>>>
>>>>>
>>>>> We use PSCI to boot secondary CPUs. You may want to check the the PSCI
>>>>> call
>>>>> has effectively been issued for those VCPUs.
>>>>>
>>>> I shall check on this!
>>>>>
>>>>> Which Xen and Linux version are you using?
>>>>
>>>> Xen is 4.5 dev (git clone git://xenbits.xen.org/xen.git)
>>>> Linux is 3.14 from hardkernel linux repository, branch:
>>>> odroid-3.14.y-linaro
>>>
>>>
>>> Can you try a Linux upstream? The error may come from the hardkernel
>>> linux.
>>
>> Is this for domU?
>> For dom0, I do not have a working kernel for upstream for the XU. I
>> did try 3.16 samsung-next as well as mainline linux and the dts needs
>> to be worked upon (or so I think)
>
> I was talking about domU.
>
>> Using upstream for domU exhibits the same behavior.
>>
>> One out of roughly 10 creates succeeds (I can get console output).
>> In the cases that succeed, I do see that do_psci_cpu_on() gets called.
>> In the cases that domU does not boot up, the call to do_psci_cpu_on()
>> does not happen.
>
> Reading back one of your previous mail:
>
> "I have noticed that there is no ARM port of XEN having more than 2
> CPUs. Is that correct? I am mentioning this, cause with the XU, though
> I can bring up all 4 processors in XEN and in dom0, domU fails to make
> much boot progress when it is xl created. I am able to boot domU, if I
> restrict the dtb for dom0 to 2 CPUs."
>
> By "I restrict the dtb for dom0 to 2 CPUs", did you mean removing some
> CPUs in the device tree or using dom0_max_vcpus=2 on Xen command line?

I forgot a question. Does a guest with 1 VCPU is working fine? I can't 
fine any clue on your mails.

> I was wondering if dom0 is touching the physical CPUs by mistake (mainly
> because we map some regions used to control them).
> It might be worse to check that no cpufreq or power management is called
> on DOM0 at any time.

-- 
Julien Grall