linux-kernel - Re: [PATCH v3] ARM: dts: imx6qdl-nitrogen6x: Add SPI NOR partitions

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Message-ID: <CAP9ODKrG=hsGSs=rfXumnLJwNeRe+njMOsK5Q=bYDm+gXnXUeQ@mail.gmail.com>
Date:   Tue, 28 Nov 2017 15:37:02 -0200
From:   Otavio Salvador <otavio.salvador@...ystems.com.br>
To:     Fabio Estevam <festevam@...il.com>
Cc:     Otavio Salvador <otavio@...ystems.com.br>,
        Mark Rutland <mark.rutland@....com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Russell King <linux@...linux.org.uk>,
        Gary Bisson <gary.bisson@...ndarydevices.com>,
        Rob Herring <robh+dt@...nel.org>,
        Sascha Hauer <kernel@...gutronix.de>,
        Fabio Estevam <fabio.estevam@....com>,
        Shawn Guo <shawnguo@...nel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3] ARM: dts: imx6qdl-nitrogen6x: Add SPI NOR partitions

Hello Fabio,

On Mon, Nov 27, 2017 at 2:17 PM, Fabio Estevam <festevam@...il.com> wrote:
> On Mon, Nov 27, 2017 at 11:31 AM, 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>
>
> Has this been tested? I mean, have you tested the locking mechanism is
> really working in this SPI NOR flash?

Yes, we tested it here using Linux 4.14 but didn't notice this SPI NOR
does not support the lock.

> As far as I can see the SPI locking mechanism does not need device
> tree properties.

Humm it is confusing, at least for me that am not used to the this. In
any case, I think for now it is better to include the partitions
without read-only and lock as it is convenient to have access to it
from Linux so we adhere the same partition layout used in Boundary's
Linux fork.

-- 
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