linux-kernel - Re: MTD: How to get actual image size from MTD partition

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Date:   Mon, 19 Jul 2021 14:39:46 +0530
From:   Pintu Agarwal <pintu.ping@...il.com>
To:     Richard Weinberger <richard@....at>
Cc:     Greg KH <greg@...ah.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-mtd <linux-mtd@...ts.infradead.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Phillip Lougher <phillip@...ashfs.org.uk>,
        Sean Nyekjaer <sean@...nix.com>,
        Kernelnewbies <kernelnewbies@...nelnewbies.org>
Subject: 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