linux-kernel - Re: [PATCH v2] ARM: dts: imx6qdl-nitrogen6x: Add SPI NOR partitions

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Message-ID: <CAP9ODKoefNEcQtrCCLEa7hzx2D_2vJTit0t8ooQGTx7Uyds1mQ@mail.gmail.com>
Date:   Sat, 25 Nov 2017 07:55:53 -0200
From:   Otavio Salvador <otavio.salvador@...ystems.com.br>
To:     Otavio Salvador <otavio@...ystems.com.br>
Cc:     "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Gary Bisson <gary.bisson@...ndarydevices.com>,
        Fabio Estevam <fabio.estevam@....com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Sascha Hauer <kernel@...gutronix.de>,
        Kernel development list <linux-kernel@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Russell King <linux@...linux.org.uk>,
        Shawn Guo <shawnguo@...nel.org>
Subject: Re: [PATCH v2] ARM: dts: imx6qdl-nitrogen6x: Add SPI NOR partitions

On Fri, Nov 24, 2017 at 3:00 PM, Otavio Salvador
<otavio@...ystems.com.br> wrote:
> This adds the partitions definition for the SPI NOR to provide
> backward compatibility with the documented[1] layout used with
> Boundary Devices BSP.
>
> 1. https://boundarydevices.com/boot-flash-access-linux/
>
> It exports to Linux:
>
>  mtd0: bootloader
>  mtd1: env
>  mtd2: splash
>
> Signed-off-by: Otavio Salvador <otavio@...ystems.com.br>

After thinking a bit about Fabio's recommendation to use 'read-only'
to protect the partitions, I think it'd be better to use 'lock' so it
is still possible to write them on Linux but it requires a unlock
prior changing it.

In my case, I am interested in being capable of upgrading the
bootloader from Linux.

What people think?

-- 
Otavio Salvador                             O.S. Systems
http://www.ossystems.com.br        http://code.ossystems.com.br
Mobile: +55 (53) 9981-7854            Mobile: +1 (347) 903-9750