linux-kernel - Re: [PATCH 2/5] mtd: block2mtd: Add support for specifying MTD write size and subpage shift

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Message-ID: <79f3b92f-5be4-8d46-985d-0b38cffd6032@nod.at>
Date:   Mon, 5 Jun 2017 13:27:18 +0200
From:   Richard Weinberger <richard@....at>
To:     Pali Rohár <pali.rohar@...il.com>
Cc:     David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Artem Bityutskiy <dedekind1@...il.com>,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] mtd: block2mtd: Add support for specifying MTD write
 size and subpage shift

Pali,

Am 05.06.2017 um 13:25 schrieb Pali Rohár:
> On Monday 05 June 2017 13:23:22 Richard Weinberger wrote:
>> Pali,
>>
>> Am 05.06.2017 um 13:21 schrieb Pali Rohár:
>>> On Friday 02 June 2017 18:13:02 Richard Weinberger wrote:
>>>> Pali,
>>>>
>>>> Am 02.06.2017 um 17:43 schrieb Pali Rohár:
>>>>> It is needed for creating emulated devices suitable for using in UBI layer
>>>>> and with UBIFS.
>>>>
>>>> Why?
>>>
>>> ubifs depends on write size of nand. And without those parameters as
>>> specified in cover letter I'm unable to mount N900 rootfs image exported
>>> via block2mtd. ubifs reject such image.
>>
>> Hmm, so you render block2mtd into a semi-NAND chip? :)
> 
> Probably you can call it like that. But it is still MTD device...

This is what I meant in my other mail.
You add NAND specific properties but still denote it as MTD_RAM/ROM.
I'm not sure whether this is a good idea.

Thanks,
//richard