Date: Sat, 19 Nov 2022 20:32:52 -0700 From: Warner Losh <imp@bsdimp.com> To: Tomoaki AOKI <junchoon@dec.sakura.ne.jp> Cc: =?UTF-8?Q?Chlast=C3=A1k_Miroslav?= <mira@chlastak.cz>, FreeBSD CURRENT <freebsd-current@freebsd.org> Subject: Re: loader.conf and rootdev option for memory disk Message-ID: <CANCZdfpNtRnqoirja30q_7gotE=Z9w2MG-XhjFETwNQU=XzgLQ@mail.gmail.com> In-Reply-To: <20221120100046.b44741ca341c1593a72f594b@dec.sakura.ne.jp> References: <2E58D34B-F8C5-4291-B019-9E24F56DC3DF@chlastak.cz> <CANCZdfqGhHXCJtUOctpoB-sAuxSdzJZERSBritTazp_uragZ=Q@mail.gmail.com> <F3702494-1433-4324-B972-52FBD84EFFD8@chlastak.cz> <20221120055845.366367f1d371ae4d6eb8d747@dec.sakura.ne.jp> <97A75B5E-6C38-4CFB-9978-7E254595D980@chlastak.cz> <20221120100046.b44741ca341c1593a72f594b@dec.sakura.ne.jp>
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[-- Attachment #1 --] On Sat, Nov 19, 2022 at 6:01 PM Tomoaki AOKI <junchoon@dec.sakura.ne.jp> wrote: > But your previous post shows rootdev= there didn't work, and needed > setting vfs.root.mountfrom=. > > OTOH, rootdev= is reported to work in efi/boot/freebsd/loader.env (with > efi loader) on freebsd-users-jp ML (as it's Japanese ML, in Japanese) > this year. > > So /boot/defaults/loader.conf (/usr/src/stand/defaults/loader.conf) > should be fixed, and what should be set in loader.env should be > documented. > > *Dedicated brand-new manpage or in boot.8 (or in loader.8 describing > rootdev, or loader.conf.8 in contrast with itself). > Reading the code it's complicated. rootdev looks like it overrides the default root... unless vfs.root.mountfrom has already been set. > > On Sat, 19 Nov 2022 22:31:42 +0100 > Chlasták Miroslav <mira@chlastak.cz> wrote: > > > Look at the file /boot/defaults/loader.conf: > > > > … > > ### Initial memory disk settings ########################### > > #mdroot_load="YES" # The "mdroot" prefix is arbitrary. > > #mdroot_type="md_image" # Create md(4) disk at boot. > > #mdroot_name="/boot/root.img" # Path to a file containing the image. > > #rootdev="ufs:/dev/md0" # Set the root filesystem to md(4) > device. > > … > > > > — > > Mira > > > > > On 19 Nov 2022, at 21:58, Tomoaki AOKI <junchoon@dec.sakura.ne.jp> > wrote: > > > > > > IIUC, rootdev should be set in loader.env, if needed. > > > `man 5 loader.conf` has nothing about rootdev variable. > > > > > > (It's undocumented, IIRC.) > > > > > > > > > On Sat, 19 Nov 2022 19:57:47 +0100 > > > Chlasták Miroslav <mira@chlastak.cz <mailto:mira@chlastak.cz>> wrote: > > > > > >> I have my device working for now - but the question is - Is the > documentation and example for “rootdev” right or not? > > >> > > >> — > > >> Mira > > >> > > >>> On 18 Nov 2022, at 21:13, Warner Losh <imp@bsdimp.com <mailto: > imp@bsdimp.com>> wrote: > > >>> > > >>> > > >>> > > >>> On Fri, Nov 18, 2022 at 12:57 PM Chlasták Miroslav <mira@chlastak.cz > <mailto:mira@chlastak.cz> <mailto:mira@chlastak.cz <mailto: > mira@chlastak.cz>>> wrote: > > >>> Hi all, > > >>> > > >>> In the /boot/defaults/loader.conf are these options for memory disk > settings: > > >>> > > >>> #mdroot_load="YES" # The "mdroot" prefix is arbitrary. > > >>> #mdroot_type="md_image" # Create md(4) disk at boot. > > >>> #mdroot_name="/boot/root.img" # Path to a file containing the > image. > > >>> #rootdev="ufs:/dev/md0" # Set the root filesystem to md(4) > device. > > >>> > > >>> > > >>> But - is this example for rootdev option still right? Because > “ufs:/dev/md0” works fine on freebsd 12.1, but on freebsd 12.3 this does > not work and generates error message: > > >>> > > >>> Can’t determine root device > > >>> > > >>> > > >>> When I use this option with value “/dev/md0” or “md0” (even with > this option commented out), so the machine boots correctly without any > error. > > >>> > > >>> I think you want vfs.root.mountfrom= instead of rootdev= here. > > >>> > > >>> Warner > > >>> > > >>> — > > >>> Mira > > >> > > > > > > > > > -- > > > 青木 知明 [Tomoaki AOKI] <junchoon@dec.sakura.ne.jp <mailto: > junchoon@dec.sakura.ne.jp>> > > > > > -- > 青木 知明 [Tomoaki AOKI] <junchoon@dec.sakura.ne.jp> > > [-- Attachment #2 --] <div dir="ltr"><div dir="ltr"><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Nov 19, 2022 at 6:01 PM Tomoaki AOKI <<a href="mailto:junchoon@dec.sakura.ne.jp">junchoon@dec.sakura.ne.jp</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">But your previous post shows rootdev= there didn't work, and needed<br> setting vfs.root.mountfrom=.<br> <br> OTOH, rootdev= is reported to work in efi/boot/freebsd/loader.env (with<br> efi loader) on freebsd-users-jp ML (as it's Japanese ML, in Japanese)<br> this year.<br> <br> So /boot/defaults/loader.conf (/usr/src/stand/defaults/loader.conf)<br> should be fixed, and what should be set in loader.env should be<br> documented.<br> <br> *Dedicated brand-new manpage or in boot.8 (or in loader.8 describing<br> rootdev, or loader.conf.8 in contrast with itself).<br></blockquote><div><br></div><div>Reading the code it's complicated.</div><div><br></div><div>rootdev looks like it overrides the default root... unless vfs.root.mountfrom</div><div>has already been set.<br></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"> <br> On Sat, 19 Nov 2022 22:31:42 +0100<br> Chlasták Miroslav <<a href="mailto:mira@chlastak.cz" target="_blank">mira@chlastak.cz</a>> wrote:<br> <br> > Look at the file /boot/defaults/loader.conf:<br> > <br> > …<br> > ### Initial memory disk settings ###########################<br> > #mdroot_load="YES" # The "mdroot" prefix is arbitrary.<br> > #mdroot_type="md_image" # Create md(4) disk at boot.<br> > #mdroot_name="/boot/root.img" # Path to a file containing the image.<br> > #rootdev="ufs:/dev/md0" # Set the root filesystem to md(4) device.<br> > …<br> > <br> > —<br> > Mira<br> > <br> > > On 19 Nov 2022, at 21:58, Tomoaki AOKI <<a href="mailto:junchoon@dec.sakura.ne.jp" target="_blank">junchoon@dec.sakura.ne.jp</a>> wrote:<br> > > <br> > > IIUC, rootdev should be set in loader.env, if needed.<br> > > `man 5 loader.conf` has nothing about rootdev variable.<br> > > <br> > > (It's undocumented, IIRC.)<br> > > <br> > > <br> > > On Sat, 19 Nov 2022 19:57:47 +0100<br> > > Chlasták Miroslav <<a href="mailto:mira@chlastak.cz" target="_blank">mira@chlastak.cz</a> <mailto:<a href="mailto:mira@chlastak.cz" target="_blank">mira@chlastak.cz</a>>> wrote:<br> > > <br> > >> I have my device working for now - but the question is - Is the documentation and example for “rootdev” right or not?<br> > >> <br> > >> —<br> > >> Mira<br> > >> <br> > >>> On 18 Nov 2022, at 21:13, Warner Losh <<a href="mailto:imp@bsdimp.com" target="_blank">imp@bsdimp.com</a> <mailto:<a href="mailto:imp@bsdimp.com" target="_blank">imp@bsdimp.com</a>>> wrote:<br> > >>> <br> > >>> <br> > >>> <br> > >>> On Fri, Nov 18, 2022 at 12:57 PM Chlasták Miroslav <<a href="mailto:mira@chlastak.cz" target="_blank">mira@chlastak.cz</a> <mailto:<a href="mailto:mira@chlastak.cz" target="_blank">mira@chlastak.cz</a>> <mailto:<a href="mailto:mira@chlastak.cz" target="_blank">mira@chlastak.cz</a> <mailto:<a href="mailto:mira@chlastak.cz" target="_blank">mira@chlastak.cz</a>>>> wrote:<br> > >>> Hi all,<br> > >>> <br> > >>> In the /boot/defaults/loader.conf are these options for memory disk settings:<br> > >>> <br> > >>> #mdroot_load="YES" # The "mdroot" prefix is arbitrary.<br> > >>> #mdroot_type="md_image" # Create md(4) disk at boot.<br> > >>> #mdroot_name="/boot/root.img" # Path to a file containing the image.<br> > >>> #rootdev="ufs:/dev/md0" # Set the root filesystem to md(4) device.<br> > >>> <br> > >>> <br> > >>> But - is this example for rootdev option still right? Because “ufs:/dev/md0” works fine on freebsd 12.1, but on freebsd 12.3 this does not work and generates error message:<br> > >>> <br> > >>> Can’t determine root device<br> > >>> <br> > >>> <br> > >>> When I use this option with value “/dev/md0” or “md0” (even with this option commented out), so the machine boots correctly without any error.<br> > >>> <br> > >>> I think you want vfs.root.mountfrom= instead of rootdev= here.<br> > >>> <br> > >>> Warner<br> > >>> <br> > >>> —<br> > >>> Mira<br> > >> <br> > > <br> > > <br> > > -- <br> > > 青木 知明 [Tomoaki AOKI] <<a href="mailto:junchoon@dec.sakura.ne.jp" target="_blank">junchoon@dec.sakura.ne.jp</a> <mailto:<a href="mailto:junchoon@dec.sakura.ne.jp" target="_blank">junchoon@dec.sakura.ne.jp</a>>><br> > <br> <br> <br> -- <br> 青木 知明 [Tomoaki AOKI] <<a href="mailto:junchoon@dec.sakura.ne.jp" target="_blank">junchoon@dec.sakura.ne.jp</a>><br> <br> </blockquote></div></div>help
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