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=-3.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED 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 9549CC636CA for ; Fri, 16 Jul 2021 16:27:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7BB85613CC for ; Fri, 16 Jul 2021 16:27:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229809AbhGPQ34 convert rfc822-to-8bit (ORCPT ); Fri, 16 Jul 2021 12:29:56 -0400 Received: from lithops.sigma-star.at ([195.201.40.130]:56096 "EHLO lithops.sigma-star.at" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229692AbhGPQ3y (ORCPT ); Fri, 16 Jul 2021 12:29:54 -0400 Received: from localhost (localhost [127.0.0.1]) by lithops.sigma-star.at (Postfix) with ESMTP id C7A836169BB0; Fri, 16 Jul 2021 18:26:57 +0200 (CEST) Received: from lithops.sigma-star.at ([127.0.0.1]) by localhost (lithops.sigma-star.at [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id r4aiC90VSn-V; Fri, 16 Jul 2021 18:26:57 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by lithops.sigma-star.at (Postfix) with ESMTP id 4CE52616B593; Fri, 16 Jul 2021 18:26:57 +0200 (CEST) Received: from lithops.sigma-star.at ([127.0.0.1]) by localhost (lithops.sigma-star.at [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id iZzCNoafkg8f; Fri, 16 Jul 2021 18:26:57 +0200 (CEST) Received: from lithops.sigma-star.at (lithops.sigma-star.at [195.201.40.130]) by lithops.sigma-star.at (Postfix) with ESMTP id 1F0216169BB0; Fri, 16 Jul 2021 18:26:57 +0200 (CEST) Date: Fri, 16 Jul 2021 18:26:56 +0200 (CEST) From: Richard Weinberger To: Greg KH Cc: Pintu Agarwal , linux-kernel , linux-mtd , linux-fsdevel , Phillip Lougher , Sean Nyekjaer , Kernelnewbies Message-ID: <568938486.33366.1626452816917.JavaMail.zimbra@nod.at> In-Reply-To: References: Subject: Re: MTD: How to get actual image size from MTD partition MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8BIT X-Originating-IP: [195.201.40.130] X-Mailer: Zimbra 8.8.12_GA_3807 (ZimbraWebClient - FF78 (Linux)/8.8.12_GA_3809) Thread-Topic: How to get actual image size from MTD partition Thread-Index: EX+isZbzvbtTKORywh51Mf2FxgrK+w== Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org ----- Ursprüngliche Mail ----- > Von: "Greg KH" > An: "Pintu Agarwal" > CC: "linux-kernel" , "linux-mtd" , "linux-fsdevel" > , "Phillip Lougher" , "Sean Nyekjaer" , > "Kernelnewbies" , "richard" > Gesendet: Freitag, 16. Juli 2021 17:41:01 > Betreff: Re: MTD: How to get actual image size from MTD partition > On Fri, Jul 16, 2021 at 12:12:41PM +0530, Pintu Agarwal wrote: >> Hi, >> >> Our ARM32 Linux embedded system consists of these: >> * Linux Kernel: 4.14 >> * Processor: Qualcomm Arm32 Cortex-A7 >> * Storage: NAND 512MB >> * Platform: Simple busybox >> * Filesystem: UBIFS, Squashfs >> * Consists of nand raw partitions, squashfs ubi volumes. >> >> 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. :-) Thanks, //richard