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Document vfs.root.mountfrom.

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Reviewed by:	imp, wblock
Differential Revision:	https://reviews.freebsd.org/D5332
This commit is contained in:
Maxim Sobolev 2016-04-08 00:24:21 +00:00
parent 43b227c89f
commit 88a8e56bbc
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=297690
1 changed files with 25 additions and 0 deletions
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25
sys/boot/forth/loader.conf.5
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@ -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