[{"id":3682344,"web_url":"http://patchwork.ozlabs.org/comment/3682344/","msgid":"","list_archive_url":null,"date":"2026-04-23T13:20:09","subject":"Re: [PATCH v2 0/7] fit: dm-verity support","submitter":{"id":64091,"url":"http://patchwork.ozlabs.org/api/people/64091/","name":"Daniel Golle","email":"daniel@makrotopia.org"},"content":"On Thu, Apr 23, 2026 at 02:59:19PM +0200, Rasmus Villemoes wrote:\n> On Thu, Apr 16 2026, Daniel Golle wrote:\n> \n> > This series adds dm-verity support to U-Boot's FIT image infrastructure.\n> > It is the first logical subset of the larger OpenWrt boot method series\n> > posted as an RFC in February 2026 [1], extracted here for independent\n> > review and merging.\n> >\n> > OpenWrt's firmware model embeds a read-only squashfs or erofs root\n> > filesystem directly inside a uImage.FIT container as a FILESYSTEM-type\n> > loadable FIT image. At boot the kernel maps this sub-image directly from\n> > the underlying block device via the fitblk driver (/dev/fit0, /dev/fit1,\n> \n> Can you show me where that fitblk driver lives, because I can't find\n> anything like that in the linux source code. Grepping for 'fitblk' or\n> 'dev/fit' turns up nothing.\n\nThe driver is currently downstream, but going to be (re-)submitted upsteam.\nSee below for more.\n\n> \n> > ...), the goal is that the bootloader never even copies it to RAM.\n> \n> Hm, how is that achieved? I.e., how do you load and boot the FIT image\n> without loading that part, but still reading in e.g. the kernel?\n\nThe next series after this is going to suggest a way for on-demand\nloading only the actually necessary FIT images from a storage backend.\nSee\nhttps://github.com/u-boot/u-boot/pull/870\n\nAnd see here for an end-to-end demo:\nhttps://github.com/openwrt/openwrt/pull/22177","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.denx.de\n (client-ip=2a01:238:438b:c500:173d:9f52:ddab:ee01; helo=phobos.denx.de;\n envelope-from=u-boot-bounces@lists.denx.de; receiver=patchwork.ozlabs.org)","phobos.denx.de;\n dmarc=none (p=none dis=none) header.from=makrotopia.org","phobos.denx.de;\n spf=pass smtp.mailfrom=u-boot-bounces@lists.denx.de","phobos.denx.de; dmarc=none (p=none dis=none)\n header.from=makrotopia.org","phobos.denx.de;\n spf=pass smtp.mailfrom=daniel@makrotopia.org"],"Received":["from phobos.denx.de (phobos.denx.de\n [IPv6:2a01:238:438b:c500:173d:9f52:ddab:ee01])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g2zzz6C33z1yHS\n\tfor ; Sun, 26 Apr 2026 05:15:11 +1000 (AEST)","from h2850616.stratoserver.net (localhost [IPv6:::1])\n\tby phobos.denx.de (Postfix) with ESMTP id BCE6F84372;\n\tSat, 25 Apr 2026 21:15:09 +0200 (CEST)","by phobos.denx.de (Postfix, from userid 109)\n id CD168843E8; Sat, 25 Apr 2026 21:15:08 +0200 (CEST)","from pidgin.makrotopia.org (pidgin.makrotopia.org\n [IPv6:2a07:2ec0:3002::65])\n (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits))\n (No client certificate requested)\n by phobos.denx.de (Postfix) with ESMTPS id 8C5158442B\n for ; Sat, 25 Apr 2026 21:15:05 +0200 (CEST)","from local\n by pidgin.makrotopia.org with esmtpsa (TLS1.3:TLS_AES_256_GCM_SHA384:256)\n (Exim 4.99) (envelope-from )\n id 1wFtyc-000000005SN-1XVC; Thu, 23 Apr 2026 13:20:18 +0000"],"X-Spam-Checker-Version":"SpamAssassin 3.4.2 (2018-09-13) on phobos.denx.de","X-Spam-Level":"","X-Spam-Status":"No, score=-1.9 required=5.0 tests=BAYES_00,\n RCVD_IN_DNSWL_BLOCKED,SPF_HELO_NONE,SPF_PASS autolearn=ham\n autolearn_force=no version=3.4.2","Date":"Thu, 23 Apr 2026 14:20:09 +0100","From":"Daniel Golle ","To":"Rasmus Villemoes ","Cc":"Tom Rini , Simon Glass ,\n Quentin Schulz ,\n Kory Maincent ,\n Mattijs Korpershoek , Peng Fan ,\n Heinrich Schuchardt ,\n Martin Schwan , Anshul Dalal ,\n Ilias Apalodimas ,\n Sughosh Ganu ,\n Aristo Chen ,\n Ludwig Nussel ,\n Benjamin ROBIN ,\n Marek Vasut ,\n James Hilliard ,\n Wolfgang Wallner ,\n Kunihiko Hayashi ,\n David Lechner ,\n Neil Armstrong ,\n Mayuresh Chitale ,\n Jonas Karlman , Shiji Yang ,\n Francois Berder , u-boot@lists.denx.de","Subject":"Re: [PATCH v2 0/7] fit: dm-verity support","Message-ID":"","References":"\n <87wlxxltnc.fsf@prevas.dk>","MIME-Version":"1.0","Content-Type":"text/plain; charset=us-ascii","Content-Disposition":"inline","In-Reply-To":"<87wlxxltnc.fsf@prevas.dk>","X-BeenThere":"u-boot@lists.denx.de","X-Mailman-Version":"2.1.39","Precedence":"list","List-Id":"U-Boot discussion ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"u-boot-bounces@lists.denx.de","Sender":"\"U-Boot\" ","X-Virus-Scanned":"clamav-milter 0.103.8 at phobos.denx.de","X-Virus-Status":"Clean"}}]