From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chanwoo Choi Subject: Re: [PATCH v7 1/9] arm64: dts: exynos: Add dts files for 64-bit Exynos5433 SoC Date: Tue, 14 Apr 2015 16:53:35 +0900 Message-ID: <552CC77F.10801@samsung.com> References: <1426637856-3730-1-git-send-email-cw00.choi@samsung.com> <1426637856-3730-2-git-send-email-cw00.choi@samsung.com> <20150330160940.GA13731@leverpostej> <5519E2B6.2030905@samsung.com> <20150402173558.GB30669@leverpostej> <551DD321.6030707@samsung.com> <20150407102523.GA23190@leverpostej> <20150413105618.GD4076@leverpostej> <552BB14A.6010205@samsung.com> <20150413154949.GI4076@leverpostej> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-reply-to: <20150413154949.GI4076@leverpostej> Sender: linux-samsung-soc-owner@vger.kernel.org To: Mark Rutland , "kgene@kernel.org" Cc: "arnd@arndb.de" , "olof@lixom.net" , Marc Zyngier , Catalin Marinas , Will Deacon , "inki.dae@samsung.com" , "chanho61.park@samsung.com" , "sw0312.kim@samsung.com" , "jh80.chung@samsung.com" , "ideal.song@samsung.com" , "a.kesavan@samsung.com" , "devicetree@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "linux-samsung-soc@vger.kernel.org" , "linux-kernel@vger.kernel.org" List-Id: devicetree@vger.kernel.org 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