Re: [PATCH v5 1/5] mtd: spi-nor: core: add manufacturer flags

From: Esben Haabendal <esben@geanix.com>
To: Erez <erezgeva2@gmail.com>
Cc: Michael Walle <mwalle@kernel.org>,
	 Tudor Ambarus <tudor.ambarus@linaro.org>,
	 Erez Geva <erezgeva@nwtime.org>,
	linux-mtd@lists.infradead.org,
	 Pratyush Yadav <pratyush@kernel.org>,
	linux-kernel@vger.kernel.org,
	 Miquel Raynal <miquel.raynal@bootlin.com>,
	Richard Weinberger <richard@nod.at>,
	 Vignesh Raghavendra <vigneshr@ti.com>,
	 devicetree@vger.kernel.org,  Rob Herring <robh@kernel.org>,
	 Krzysztof Kozlowski <krzk+dt@kernel.org>,
	 Conor Dooley <conor+dt@kernel.org>
Subject: Re: [PATCH v5 1/5] mtd: spi-nor: core: add manufacturer flags
Date: Thu, 26 Sep 2024 13:37:06 +0200	[thread overview]
Message-ID: <8734lmhcil.fsf@geanix.com> (raw)
In-Reply-To: <CANeKEMMcZ+Y-f8Kty_4Nk-kRu+F7ZXBbxpAG1Bd_P1vcju1mUA@mail.gmail.com> (Erez's message of "Thu, 26 Sep 2024 13:08:59 +0200")

Erez <erezgeva2@gmail.com> writes:

> On Thu, 26 Sept 2024 at 09:46, Esben Haabendal <esben@geanix.com> wrote:
>>
>> Erez <erezgeva2@gmail.com> writes:
>>
>> > On Mon, 23 Sept 2024 at 18:19, Michael Walle <mwalle@kernel.org> wrote:
>> >>
>> >> > > > I would gladly remove the obsolete mx25l12805d.
>> >> > > Why? I don't see any need for that.
>> >> > Maybe because we do not want compatibility table?
>> >>
>> >> I don't get this? Anyway, we do not remove support for older
>> >> flashes for no reason.
>> >
>> > I did not insist, you asked.
>> > Macronix stopped selling these chips 15 year ago.
>> > How long do you want to support old chips?
>>
>> It is not unusual for embedded products to have a support span of more
>> than 20 years. And chips such as these flashes might not be entirely new
>> when the product is introduced. So dropping support for SPI-NOR flashes
>> that are newer than 25-30 years is definitely a risk. Somebody out there
>> might not be able to upgrade to latest kernel versions anymore, which is
>> not a position we should put anyone in. With the increasing pressure to
>> upgrade product for better security, we definitely should not make it
>> more difficult to run newer kernel versions than absolutely necessary.
>
> I do not insist. Nor send any patch in this direction.

I did not say or imply that you did any such thing.

You asked an open question, and I gave my response. Nothing more,
nothing less.

> Each project can define the extent of backward compatibility.
> In terms of compilers, linkers and tools, i.e. build environment.
> In terms of standards like the C standard we use.
> In terms of network protocols.
> And also what Hardware do we support.
>
> There is no harm in asking where the boundaries are.
> All projects move their boundaries all the time.
> The Linux kernel is no exception.

______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/