MTD: How to get actual image size from MTD partition

Richard Weinberger richard at
Mon Jul 19 05:28:14 EDT 2021

----- Ursprüngliche Mail -----
> Von: "Pintu Agarwal" < at>
> An: "richard" <richard at>
> CC: "Greg KH" <greg at>, "linux-kernel" <linux-kernel at>, "linux-mtd"
> <linux-mtd at>, "linux-fsdevel" <linux-fsdevel at>, "Phillip Lougher"
> <phillip at>, "Sean Nyekjaer" <sean at>, "Kernelnewbies" <kernelnewbies at>
> Gesendet: Montag, 19. Juli 2021 11:09:46
> Betreff: Re: MTD: How to get actual image size from MTD partition

> On Fri, 16 Jul 2021 at 21:56, Richard Weinberger <richard at> wrote:
>> >> My requirement:
>> >> To find the checksum of a real image in runtime which is flashed in an
>> >> MTD partition.
>> >
>> > Try using the dm-verity module for ensuring that a block device really
>> > is properly signed before mounting it.  That's what it was designed for
>> > and is independent of the block device type.
>> MTDs are not block devices. :-)
> Is it possible to use dm-verity with squashfs ?
> We are using squashfs for our rootfs which is an MTD block /dev/mtdblock44

Well, if you emulate a block device using mtdblock, you can use dm-verity and friends.
Also consider using ubiblock. It offers better performance and wear leveling support.


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