linux-kernel - Re: [PATCH 1/1] MIPS: DTS: cavium-octeon: provide model attribute

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Date:	Mon, 15 Feb 2016 20:50:48 +0100
From:	Heinrich Schuchardt <xypron.glpk@....de>
To:	Aaro Koskinen <aaro.koskinen@....fi>
Cc:	Arnd Bergmann <arnd@...db.de>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Andrew Bresticker <abrestic@...omium.org>,
	devicetree@...r.kernel.org, linux-mips@...ux-mips.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] MIPS: DTS: cavium-octeon: provide model attribute

On 02/15/2016 08:40 PM, Aaro Koskinen wrote:
> Hi,
> 
> On Mon, Feb 15, 2016 at 08:21:33PM +0100, Heinrich Schuchardt wrote:
>> flash-kernel has a database /usr/share/flash-kernel/db/all.db with
>> entries like:
>>
>> Machine: LeMaker Banana Pi
>> Kernel-Flavors: armmp armmp-lpae
>> Boot-Script-Path: /boot/boot.scr
>> DTB-Id: sun7i-a20-bananapi.dtb
>> U-Boot-Script-Name: bootscr.sunxi
>> Required-Packages: u-boot-tools
>>
>> Machine refers to the value of /proc/device-tree/model.
>> DTB-Id is the dtb to be installed.
>>
>> So what flash-kernel does is:
>> - look up value of /proc/device-tree/model
>> - retrieve correlated dtb file name from database
>> - install dtb with this name
>> - create symbolic links for the dtb
>>
>> If multiple boards use the the same dtb that is fine with flash-kernel
>> as long as the value of model is unique per dtb.
> 
> OCTEON does not work like this. The file you are modifying
> (octeon_3xxx.dts) is compiled into the kernel, and there is no external
> DTB file. So the model string will be always the same regardless on
> which board you have booted the kernel.
> 
> A.
>
Hello Aaro,

you are right DTBs are built in for MIPS systems.

Still it would be useful to be able to use the same property 'model' to
determine which u-boot script (boot.scr) to install.

Best regards

Heinrich Schuchardt