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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY,USER_AGENT_GIT autolearn=ham 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 8C7FDC432BE for ; Sun, 1 Aug 2021 23:45:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 70E2661054 for ; Sun, 1 Aug 2021 23:45:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231781AbhHAXpd (ORCPT ); Sun, 1 Aug 2021 19:45:33 -0400 Received: from bhuna.collabora.co.uk ([46.235.227.227]:50928 "EHLO bhuna.collabora.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231615AbhHAXpc (ORCPT ); Sun, 1 Aug 2021 19:45:32 -0400 Received: from [127.0.0.1] (localhost [127.0.0.1]) (Authenticated sender: ezequiel) with ESMTPSA id A23A21F424C8 From: Ezequiel Garcia To: linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org, Richard Weinberger Cc: Miquel Raynal , Vignesh Raghavendra , Ezequiel Garcia Subject: [PATCH 1/3] mtdblock: Update old JFFS2 mention in Kconfig Date: Sun, 1 Aug 2021 20:45:03 -0300 Message-Id: <20210801234509.18774-2-ezequiel@collabora.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210801234509.18774-1-ezequiel@collabora.com> References: <20210801234509.18774-1-ezequiel@collabora.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org JFFS2 can be mounted without 'mtdblock' since a really, really long time. Some git-log archaeology shows that in 2006 it was possible to use 'root=' to mount a JFFS2 rootfs: commit e9482b4374e2596e6f3f1ab30c4ea469f4ac6311 Author: Joern Engel Date: Tue May 30 14:25:46 2006 +0200 [MTD] Allow alternate JFFS2 mount variant for root filesystem. With this patch, "root=mtd3" and "root=mtd:foo" work for a JFFS2 rootfs. However, there are still plenty of tutorials that mention mtdblock, so users are still taking this route. Update the Kconfig to reflect this is no longer needed. Signed-off-by: Ezequiel Garcia --- drivers/mtd/Kconfig | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/drivers/mtd/Kconfig b/drivers/mtd/Kconfig index 79a8ff542883..32bed6c63863 100644 --- a/drivers/mtd/Kconfig +++ b/drivers/mtd/Kconfig @@ -127,10 +127,9 @@ config MTD_BLOCK on RAM chips in this manner. This block device is a user of MTD devices performing that function. - At the moment, it is also required for the Journalling Flash File - System(s) to obtain a handle on the MTD device when it's mounted - (although JFFS and JFFS2 don't actually use any of the functionality - of the mtdblock device). + Note that mounting a JFFS2 filesystem doesn't require using mtdblock. + It's possible to mount a rootfs using the MTD device on the "root=" + bootargs as "root=mtd2" or "root=mtd:name_of_device". Later, it may be extended to perform read/erase/modify/write cycles on flash chips to emulate a smaller block size. Needless to say, -- 2.32.0