From mboxrd@z Thu Jan 1 00:00:00 1970 From: Arnd Bergmann Subject: Re: [PATCH v2 1/3] devicetree: bindings: Document qcom,msm-id and qcom,board-id Date: Mon, 09 Mar 2015 13:11:26 +0100 Message-ID: <89746055.qtEO3GZJmR@wuerfel> References: <1425503602-24916-1-git-send-email-galak@codeaurora.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7Bit Return-path: In-Reply-To: Sender: linux-arm-msm-owner@vger.kernel.org To: Kumar Gala Cc: Olof Johansson , Kevin Hilman , linux-arm-msm , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , "arm@kernel.org" , "devicetree@vger.kernel.org" , Heiko =?ISO-8859-1?Q?St=FCbner?= List-Id: devicetree@vger.kernel.org On Friday 06 March 2015 14:37:52 Kumar Gala wrote: > On Mar 6, 2015, at 1:15 PM, Olof Johansson wrote: > > > On Fri, Mar 6, 2015 at 8:08 AM, Kumar Gala wrote: > >> > >> On Mar 5, 2015, at 7:59 PM, Olof Johansson wrote: > >> > >>> On Thu, Mar 5, 2015 at 12:23 PM, Kumar Gala wrote: > >>>> > >>>> On Mar 5, 2015, at 1:42 PM, Kevin Hilman wrote: > >>>> > >>>>> Kumar Gala writes: > >>>>> > >>>>>> The top level qcom,msm-id and qcom,board-id are utilized by bootloaders > >>>>>> on Qualcomm MSM platforms to determine which device tree should be > >>>>>> utilized and passed to the kernel. > >>>>>> > >>>>>> Cc: > >>>>>> Signed-off-by: Kumar Gala > >>>>> > >>>>> Is this the special magic that allows qcom bootloaders to take a kernel > >>>>> plus multiple DTBs and figure out which DTB to pass? > >>>>> > >>>>> Kevin > >>>> > >>>> yes > >>> > >>> That's a bummer. > >>> > >>> Luckily, the solution for upstream is still quite simple: Provide only > >>> one devicetree, and it'll be used, right? > >> > >> We can provide only one, we still need the IDs in the DT. > > > > How are the DTS provided? Concatenated with the kernel, or in a > > wrapped data format? Or in a separate partition from the kernel? > > Its a wrapped data format that is than concatenated with the kernel if I remember correctly. Then you should be able to create a tool that can write this concatenated format and insert these properties from a table that matches the boot loader, right? Arnd