Date: Fri, 8 Apr 2016 00:24:21 +0000 (UTC) From: Maxim Sobolev <sobomax@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r297690 - head/sys/boot/forth Message-ID: <201604080024.u380OL4Q087516@repo.freebsd.org>
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Author: sobomax Date: Fri Apr 8 00:24:21 2016 New Revision: 297690 URL: https://svnweb.freebsd.org/changeset/base/297690 Log: Document vfs.root.mountfrom. Reviewed by: imp, wblock Differential Revision: https://reviews.freebsd.org/D5332 Modified: head/sys/boot/forth/loader.conf.5 Modified: head/sys/boot/forth/loader.conf.5 ============================================================================== --- head/sys/boot/forth/loader.conf.5 Fri Apr 8 00:01:19 2016 (r297689) +++ head/sys/boot/forth/loader.conf.5 Fri Apr 8 00:24:21 2016 (r297690) @@ -112,6 +112,31 @@ The name must be a subdirectory of that contains a kernel. .It Ar kernel_options Flags to be passed to the kernel. +.It Ar vfs.root.mountfrom +Specify the root partition to mount. +For example: +.Pp +.Dl vfs.root.mountfrom="ufs:/dev/da0s1a" +.Pp +.Xr loader 8 +automatically calculates the value of this tunable from +.Pa /etc/fstab +from the partition the kernel was loaded from. +The calculated value might be calculated incorrectly when +.Pa /etc/fstab +is not available during +.Xr loader 8 +startup (as during diskless booting from NFS), or if a different +device is desired by the user. +The preferred value can be set in +.Pa /loader.conf . +.Pp +The value can also be overridden from the +.Xr loader 8 +command line. +This is useful for system recovery when +.Pa /etc/fstab +is damaged, lost, or read from the wrong partition. .It Ar password Protect boot menu with a password without interrupting .Ic autoboot
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