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

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Date:	Mon, 15 Feb 2016 20:21:33 +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 07:38 PM, Aaro Koskinen wrote:
> Hi,
> 
> On Mon, Feb 15, 2016 at 06:52:20PM +0100, Heinrich Schuchardt wrote:
>> On 02/15/2016 12:16 PM, Sergei Shtylyov wrote:
>>> On 2/15/2016 8:26 AM, Heinrich Schuchardt wrote:
>>>> Downstream packages like Debian flash-kernel rely on
>>>> /proc/device-tree/model
>>>> to determine how to install an updated kernel image.
>>
>> Would you support a patch having the following strings?
>>
>> model = "CAVM, Octeon 3860";
>> model = "CAVM, Octeon 6880";
> 
> The built-in DTBs are shared by multiple completely different boards
> (from multiple different manufacturers). How would those strings help
> for cases like flash-kernel?
> 
> A.
> 
Hello Aaro,

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.

Best regards

Heinrich Schuchardt