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

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Message-ID: <20171127101739.qs6ws3232hd5qwgv@t450s.lan>
Date:   Mon, 27 Nov 2017 11:17:39 +0100
From:   Gary Bisson <gary.bisson@...ndarydevices.com>
To:     Otavio Salvador <otavio.salvador@...ystems.com.br>
Cc:     Otavio Salvador <otavio@...ystems.com.br>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        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

Hi Otavio,

On Sat, Nov 25, 2017 at 07:55:53AM -0200, Otavio Salvador wrote:
> 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?

Agreed, I would rather have the lock option, especially for the splash
and environment.

Regards,
Gary