From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 94176C636C9 for ; Mon, 19 Jul 2021 09:11:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7E7646101E for ; Mon, 19 Jul 2021 09:11:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235515AbhGSIaX (ORCPT ); Mon, 19 Jul 2021 04:30:23 -0400 Received: from mail-ej1-f47.google.com ([209.85.218.47]:33517 "EHLO mail-ej1-f47.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235150AbhGSIaT (ORCPT ); Mon, 19 Jul 2021 04:30:19 -0400 Received: by mail-ej1-f47.google.com with SMTP id bu12so27603794ejb.0; Mon, 19 Jul 2021 02:10:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=RBSq6zJFuhCvZnOd2gsZfOMT0eqyDUMuVPMMsfBiF1k=; b=tyuwkC2PzoZWVuCqm9kCcz3M9SCCkXn/k2TPyTvNUCyrH//h97IumALBHO8pcUpWgj OIWRiPnAheYYrXvjryxDIP6hOU9+DElevR87h88njDFs3ujo0voRJaw5/Ll1x8qjwGgv zd1xKrFqSC+6ZSuU5Wyn9GEwDDm+eQGmeUJu/ZCU1tnUkp/B08O/yyMYbk60PfjNWBRs HtRbPlO/whptCcPo2L3HmnD6a9KfspVqDB+1IKiFAVxZtb9cttM5npNsK/uS0YEHudjQ v3detn/3H/nsLpPwP9PVzSAFnGO6NtzfUIcxd+tPhJ0i6uwXc9BWELDB/9jK/hpPQpXX GHGw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=RBSq6zJFuhCvZnOd2gsZfOMT0eqyDUMuVPMMsfBiF1k=; b=FgQxKc5byMJe0bSG1fnGpoawYdpDi9fTYJDOnrhCStxHvzA5k3Yh0zBr6/BGhBJaSV hAI/rKWJ3yLxZf9TJzJGl1s2KC3lLreXhQ/SuAXVsdHLxm91k0d1k/lHiAzdOOP3sCMt QQAyvuXqtR0PChino0BErbaw4Ui6rTlJ+YPNQFOMPBsA7d0XIdVOQbanVHAtEMhiLmWd 7xfAb9VO8o1Vcm7B5vWKWr9MvOAwmIyIW91DRsVWCwrhUcRDf1qpr65X1pj8PjLeIfvs SYaoyPlVBMJczgpxt+CoFYZWd+C0ZEmnreBEJUmKNQ4UIVAu9Ajaj4f5gTvH4nFfsqYQ YiiA== X-Gm-Message-State: AOAM530I4p1W3KBuvr9MMnUBxhZC+jy8dYaw+/ddUO/a6OpbKZZv6g0k qW0p4QZ+jHqUyxxKhZ2mkaOG53f6RqL7n18ZGjQ= X-Google-Smtp-Source: ABdhPJwubtgEMes7Ng29QD5qA/jN51mjW/q7+dtbpcLGkpLbDjrv1aOLcqCXW12Mc7+LVAk5fM+b/NX/9+Yz96jFMnM= X-Received: by 2002:a17:906:9d17:: with SMTP id fn23mr26835249ejc.191.1626685798074; Mon, 19 Jul 2021 02:09:58 -0700 (PDT) MIME-Version: 1.0 References: <568938486.33366.1626452816917.JavaMail.zimbra@nod.at> In-Reply-To: <568938486.33366.1626452816917.JavaMail.zimbra@nod.at> From: Pintu Agarwal Date: Mon, 19 Jul 2021 14:39:46 +0530 Message-ID: Subject: Re: MTD: How to get actual image size from MTD partition To: Richard Weinberger Cc: Greg KH , linux-kernel , linux-mtd , linux-fsdevel , Phillip Lougher , Sean Nyekjaer , Kernelnewbies Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org On Fri, 16 Jul 2021 at 21:56, Richard Weinberger 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