linux-kernel - Re: [PATCH] mtd: spi-nor: stop printing superfluous debug info

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Message-ID: <d7bb4580-00b9-4206-bbfc-bd203c21a877@linaro.org>
Date:   Tue, 28 Nov 2023 09:39:13 +0000
From:   Tudor Ambarus <tudor.ambarus@...aro.org>
To:     liao jaime <jaimeliao.tw@...il.com>,
        Michael Walle <michael@...le.cc>
Cc:     Miquel Raynal <miquel.raynal@...tlin.com>, jaimeliao@...c.com.tw,
        pratyush@...nel.org, richard@....at, linux-mtd@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mtd: spi-nor: stop printing superfluous debug info

cut

>>> Maybe we don't need this at all, as long as one message remains about
>>> the JEDEC ID, but keep in mind that spi-nors are commonly storing the
>>> rootfs and if your spi-nor does not boot you don't have a userspace yet
>>> and all the debugfs entries are purely useless.
>>
>> Good point.
>>
>> Just curious, do you know any boards which has the rootfs writable on
>> the spi-nor flash?
> I am also interested.
> 

Having the rootfs stored on SPI NOR is a poor design decision as you're
better of with a NAND, which is cheaper and faster on writes. I tried in
the past a ubifs on top of a large (64 and 128MB) SPI NOR flash. But
they were plug-able flashes, not something that is always tied to the
board. Microchip's sama7g5ek comes with a 128MB macronix SPI NOR flash
populated. But there are other vendors that provide large SPI NORs if
really needed.

Cheers,
ta