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Sat, 14 Aug 2021 17:21:01 -0700 (PDT) From: "Valdis Kl=?utf-8?Q?=c4=93?=tnieks" X-Google-Original-From: "Valdis Kl=?utf-8?Q?=c4=93?=tnieks" X-Mailer: exmh version 2.10.0-pre 07/05/2021 with nmh-1.7+dev To: jim.cromie@gmail.com Subject: Re: VFS: Cannot open root device "(null)" or unknown-block(0, 0): error -2 In-Reply-To: References: Mime-Version: 1.0 Date: Sat, 14 Aug 2021 20:21:00 -0400 Message-ID: <69789.1628986860@turing-police> Cc: kernelnewbies X-BeenThere: kernelnewbies@kernelnewbies.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Learn about the Linux kernel List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============5950272636852411098==" Errors-To: kernelnewbies-bounces@kernelnewbies.org --===============5950272636852411098== Content-Type: multipart/signed; boundary="==_Exmh_1628986859_69272P"; micalg=pgp-sha256; protocol="application/pgp-signature" Content-Transfer-Encoding: 7bit --==_Exmh_1628986859_69272P Content-Type: text/plain; charset=us-ascii On Fri, 13 Aug 2021 18:08:38 -0600, jim.cromie@gmail.com said: > then I added BTRFS_FS, since thats the host fs. > of course it didnt work. > VFS: Cannot open root device "(null)" or unknown-block(0,0): error -2 > Please append a correct "root=" boot option; here are the available partitions: > Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) > CPU: 0 PID: 1 Comm: swapper Tainted: G W 5.14.0-rc4+ #5 And it didn't find any usable btrfs (or other fs it knew about) > Heres a working kernel (if overlarge config) > VFS: Mounted root (9p filesystem) readonly on device 0:20. > Anybody see any clues ? That '9p filesystem' should be a really big clue. If that's the root fs that you actually want to use, you need to do two things: a) point at it with root= b) have 9p filesystem support in the kernel --==_Exmh_1628986859_69272P Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Comment: Exmh version 2.9.0 11/07/2018 iQEcBAEBCAAGBQJhGF3rAAoJEI0DS38y7CIcR3cIAKGQloDD43lNTS1pUKPHMYAi aA3+wPUqx55lEBw8sEzN3PmbTLtYX+YB/400ZKXgVgT6OE8h72RbqyZ0sNrTVqzD 7BGSUy4dKmtfQwhxmBzB/Uucrc49pLoHmzA7rp3dl76ixqF4kEX0n3lFW0GWKcg3 dZ9hRPnwQ+TqE9eK0B0QmI29s1Gn1e+4KbeB8+NjanXQsTs3b6vGXrCyLQQkDqca 8Yg/dbrW0vo/Hsd7TVQJnDvwRCAoPjkus61qRMGeLnsKkkrfO5AF6puV1ta9X1ok lf08G+wCefR/tf2rgtrbCqNz6WN5Keetl3+vRZOOOicY+qz5D78ZHTPFbvlpPUE= =4+iO -----END PGP SIGNATURE----- --==_Exmh_1628986859_69272P-- --===============5950272636852411098== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies --===============5950272636852411098==--