linux-kernel - Re: [PATCH v7 1/9] arm64: dts: exynos: Add dts files for 64-bit Exynos5433 SoC

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Date:	Tue, 14 Apr 2015 16:53:35 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	Mark Rutland <mark.rutland@....com>,
	"kgene@...nel.org" <kgene@...nel.org>
Cc:	"arnd@...db.de" <arnd@...db.de>, "olof@...om.net" <olof@...om.net>,
	Marc Zyngier <Marc.Zyngier@....com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Will Deacon <Will.Deacon@....com>,
	"inki.dae@...sung.com" <inki.dae@...sung.com>,
	"chanho61.park@...sung.com" <chanho61.park@...sung.com>,
	"sw0312.kim@...sung.com" <sw0312.kim@...sung.com>,
	"jh80.chung@...sung.com" <jh80.chung@...sung.com>,
	"ideal.song@...sung.com" <ideal.song@...sung.com>,
	"a.kesavan@...sung.com" <a.kesavan@...sung.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v7 1/9] arm64: dts: exynos: Add dts files for 64-bit
 Exynos5433 SoC

Hi Kukjin and Mark,

On 04/14/2015 12:49 AM, Mark Rutland wrote:
>>>>>> So NAK to the PSCI node and PSCI enable method in this dts until we
>>>>>> either have a working firmware, or a reasonable mechanism to handle the
>>>>>> deficiency.
>>>>>
>>>>> There is only CPU0 hotplug issue. Excpet CPU{1-7} are well working.
>>>>
>>>> I understand that, but the issue with CPU0 is still a blocker from my
>>>> PoV.
>>>>
>>>>> To fix this issue, we must need the help of firmware developer.
>>>>> But, We never get the any help.
>>>>
>>>> Previously dyou said that you did not have access to the source code
>>>> rather than not having help from the relevant firmware engineers. I take
>>>> it you have informed them of the issue with CPU0?
>>
>> I didn't ask any help to firmware engineer because I didn't know who firmware engineer
>> and also didn't access the source code. If I knew the engineer and can access them,
>> I would have asked some help to them or inquired the reason about CPU0 not hotplugged.
> 
> You must have acquired the firmware (or board(s) with the firmware
> preloaded) from somewhere. Surely you can work backwards from there to
> file a bug report and/or inquire as to who you need to speak to...

As you commented, I got the board that firmware was preloaded.
Unfortunately, I didn't know the any routine to contact firmware developer
and developer about SoC design.

Dear Kukjin,
I need your help about CPU0 issue of Exynos SoC.
Could you answer why CPU0 cannot be hotplugged on Exynos SoC?

Thanks,
Chanwoo Choi

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