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Mon, 05 Feb 2024 10:31:46 -0800 (PST) X-Forwarded-Encrypted: i=0; AJvYcCVDL0RZPPd9u8D21DgQ8C3M7YDjjZ4d/iPVMFKlCJ6Jx5m950Ey8INRtzEfSS8+HmpmbFgTfY/7sduST2lCvKkcJZOALy69GdYMl7I= Received: from flare ([146.185.218.236]) by smtp.gmail.com with ESMTPSA id h21-20020a19ca55000000b0051155ed0553sm27715lfj.205.2024.02.05.10.31.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 05 Feb 2024 10:31:46 -0800 (PST) Date: Mon, 5 Feb 2024 21:41:25 +0300 From: Antony Pavlov To: Ahmad Fatoum Cc: Dan Shelton , barebox@lists.infradead.org Message-Id: <20240205214125.166802e0ece35280b563d728@gmail.com> In-Reply-To: References: X-Mailer: Sylpheed 3.7.0 (GTK+ 2.24.33; i686-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240205_103149_267343_C5FD18D4 X-CRM114-Status: GOOD ( 22.60 ) X-BeenThere: barebox@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "barebox" X-SA-Exim-Connect-IP: 2607:7c80:54:3::133 X-SA-Exim-Mail-From: barebox-bounces+lore=pengutronix.de@lists.infradead.org X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on metis.whiteo.stw.pengutronix.de X-Spam-Level: X-Spam-Status: No, score=-6.3 required=4.0 tests=AWL,BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A, RCVD_IN_DNSWL_MED,SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.2 Subject: Re: NFSv4 boot support? X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on metis.whiteo.stw.pengutronix.de) On Wed, 31 Jan 2024 22:37:50 +0100 Ahmad Fatoum wrote: Hi all! > Hello Dan, >=20 > On 31.01.24 22:03, Dan Shelton wrote: > > Hello! > >=20 > > Does barebox support booting from a NFSv4 filesystem, e.g. boot from > > NFSv4 filesystem into a Linux NFSv4 netroot (diskless machine)? >=20 > The barebox network stack only does UDP/IP. There have been attempts to > bring a TCP stack into barebox, but none have so far succeeded to > make it mainline. This is a hard requirement before we can consider > supporting NFSv4. I hope that lwIP could fill this gap in the future, > but no one is actively continuing this work as far as I am aware[1]. >=20 > > We need NFSv4, because it does not need rpcbind, and combines > > filesystem, lockd and other stuff all in one TCP port (2049). Site > > policy also does not allow NFSv2/NFSv3, but allows NFSv4. >=20 > Please note that this only concerns barebox and that kernel nfsroot is > unaffected. You can load kernel and device tree over TFTP and supply a > suitable command line argument to the kernel to use a NFS root. >=20 > The standard net boot target does just that: > https://elixir.bootlin.com/barebox/v2024.01.0/source/defaultenv/defaulten= v-2-base/boot/net >=20 > It specifies TCP, but hardcodes v3 currently. I guess we could drop the v= 3 and let > the kernel decide on its own what version it will use? If that doesn't wo= rk, you can > override the file locally in your environment, e.g. via CONFIG_DEFAULT_EN= VIRONMENT > pointing at a directory that contains a boot/net file with the appropriate > changes (or just call your boot target something else like boot/nfsv4). >=20 > Hope this helps. >=20 > [1]: Some attempts I am aware of: > https://github.com/a3f/barebox/tree/lwip It looks like lwip is BSD-3-clause-licensed. Can we use the BSD-3-clause co= de in barebox? > https://github.com/olerem/barebox/tree/picotcp-2019.06.29 > https://github.com/jmaselbas/barebox/commit/4a987bfdc2ad50c13126dd62= 90d2477c3fc0c87d --=20 Best regards, =A0 Antony Pavlov