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

From: Richard Weinberger
Date: Sun Jun 18 2017 - 06:17:31 EST


Am 18.06.2017 um 12:06 schrieb Pavel Machek:
> Hi!
>>>>>> 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.
> Can you suggest any other way for Pali to mount rootfs image on his
> PC?

Are you my micro manager? ;-)

As stated in my other mail, we have nandsim and there is work going on
to allow specifying arbitrary NAND sizes.
An alternative approach can be found here: