375 lines
10 KiB
Groff
375 lines
10 KiB
Groff
.\" Copyright (c) 1999 Daniel C. Sobral
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.Dd October 6, 2018
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.Dt LOADER.CONF 5
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.Os
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.Sh NAME
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.Nm loader.conf
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.Nd "system bootstrap configuration information"
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.Sh DESCRIPTION
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The file
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.Nm
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contains descriptive information on bootstrapping the system.
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Through
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it you can specify the kernel to be booted, parameters to be passed to
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it, and additional modules to be loaded; and generally set all variables
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described in
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.Xr loader 8 .
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.Pp
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.Sh SYNTAX
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Though
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.Nm Ns 's
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format was defined explicitly to resemble
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.Xr rc.conf 5 ,
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and can be sourced by
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.Xr sh 1 ,
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some settings are treated in a special fashion.
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Also, the
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behavior of some settings is defined by the setting's suffix;
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the prefix identifies which module the setting controls.
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.Pp
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The general parsing rules are:
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.Bl -bullet
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.It
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Spaces and empty lines are ignored.
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.It
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A # sign will mark the remainder of the line as a comment.
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.It
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Only one setting can be present on each line.
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.El
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.Pp
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All settings have the following format:
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.Pp
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.Dl variable="value"
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.Pp
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Unless it belongs to one of the classes of settings that receive special
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treatment, a setting will set the value of a
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.Xr loader 8
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environment variable.
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The settings that receive special
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treatment are listed below.
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Settings beginning with
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.Qq *
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below define the modules to be loaded and
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may have any prefix; the prefix identifies a module.
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All such settings sharing a common
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prefix refer to the same module.
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.Bl -tag -width Ar
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.It Ar exec
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Immediately executes a
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.Xr loader 8
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command.
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This type of setting cannot be processed by programs other
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than
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.Xr loader 8 ,
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so its use should be avoided.
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Multiple instances of it will be processed
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independently.
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.It Ar loader_conf_files
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Defines additional configuration files to be processed right after the
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present file.
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.It Ar kernel
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Name of the kernel to be loaded.
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If no kernel name is set, no additional
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modules will be loaded.
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The name must be a subdirectory of
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.Pa /boot
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that contains a kernel.
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.It Ar kernel_options
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Flags to be passed to the kernel.
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.It Ar vfs.root.mountfrom
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Specify the root partition to mount.
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For example:
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.Pp
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.Dl vfs.root.mountfrom="ufs:/dev/da0s1a"
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.Pp
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.Xr loader 8
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automatically calculates the value of this tunable from
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.Pa /etc/fstab
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from the partition the kernel was loaded from.
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The calculated value might be calculated incorrectly when
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.Pa /etc/fstab
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is not available during
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.Xr loader 8
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startup (as during diskless booting from NFS), or if a different
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device is desired by the user.
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The preferred value can be set in
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.Pa /loader.conf .
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.Pp
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The value can also be overridden from the
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.Xr loader 8
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command line.
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This is useful for system recovery when
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.Pa /etc/fstab
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is damaged, lost, or read from the wrong partition.
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.It Ar password
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Protect boot menu with a password without interrupting
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.Ic autoboot
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process.
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The password should be in clear text format.
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If a password is set, boot menu will not appear until any key is pressed during
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countdown period specified by
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.Va autoboot_delay
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variable or
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.Ic autoboot
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process fails.
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In both cases user should provide specified password to be able to access boot
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menu.
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.It Ar bootlock_password
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Provides a password to be required by check-password before execution is
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allowed to continue.
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The password should be in clear text format.
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If a password is set, the user must provide specified password to boot.
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.It Ar verbose_loading
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If set to
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.Dq YES ,
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module names will be displayed as they are loaded.
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.It Ar module_blacklist
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Blacklist of modules.
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Modules specified in the blacklist may not be loaded automatically with a
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.Ar *_load
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directive, but they may be loaded directly at the
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.Xr loader 8
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prompt.
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Blacklisted modules may still be loaded indirectly as dependencies of other
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modules.
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.It Ar *_load
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If set to
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.Dq YES ,
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that module will be loaded.
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If no name is defined (see below), the
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module's name is taken to be the same as the prefix.
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.It Ar *_name
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Defines the name of the module.
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.It Ar *_type
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Defines the module's type.
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If none is given, it defaults to a kld module.
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.It Ar *_flags
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Flags and parameters to be passed to the module.
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.It Ar *_before
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Commands to be executed before the module is loaded.
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Use of this setting
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should be avoided.
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.It Ar *_after
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Commands to be executed after the module is loaded.
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Use of this setting
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should be avoided.
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.It Ar *_error
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Commands to be executed if the loading of a module fails.
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Except for the
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special value
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.Dq abort ,
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which aborts the bootstrap process, use of this setting should be avoided.
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.El
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.Pp
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.Em WARNING:
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developers should never use these suffixes for any kernel environment
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variables (tunables) or conflicts will result.
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.Sh DEFAULT SETTINGS
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Most of
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.Nm Ns 's
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default settings can be ignored.
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The few of them which are important
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or useful are:
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.Bl -tag -width bootfile -offset indent
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.It Va bitmap_load
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.Pq Dq NO
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If set to
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.Dq YES ,
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a bitmap will be loaded to be displayed on screen while booting.
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.It Va bitmap_name
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.Pq Dq Pa /boot/splash.bmp
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Name of the bitmap to be loaded.
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Any other name can be used.
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.It Va comconsole_speed
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.Dq ( 9600
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or the value of the
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.Va BOOT_COMCONSOLE_SPEED
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variable when
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.Xr loader 8
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was compiled).
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Sets the speed of the serial console.
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If the previous boot loader stage specified that a serial console
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is in use then the default speed is determined from the current
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serial port speed setting.
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.It Va console
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.Pq Dq vidconsole
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.Dq comconsole
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selects serial console,
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.Dq vidconsole
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selects the video console,
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.Dq nullconsole
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selects a mute console
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(useful for systems with neither a video console nor a serial port), and
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.Dq spinconsole
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selects the video console which prevents any input and hides all output
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replacing it with
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.Dq spinning
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character (useful for embedded products and such).
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.It Va efi_max_resolution
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Specify the maximum desired resolution for the EFI console.
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The following values are accepted:
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.Bl -column "WidthxHeight"
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.It Sy Value Ta Sy Resolution
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.It 480p Ta 640x480
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.It 720p Ta 1280x720
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.It 1080p Ta 1920x1080
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.It 2160p Ta 3840x2160
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.It 4k Ta 3840x2160
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.It 5k Ta 5120x2880
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.It Va Width Ns x Ns Va Height Ta Va Width Ns x Ns Va Height
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.El
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.It Va kernel
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.Pq Dq kernel
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.It Va kernels
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.Pq Dq kernel kernel.old
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Space or comma separated list of kernels to present in the boot menu.
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.It Va loader_conf_files
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.Pq Dq Pa /boot/loader.conf /boot/loader.conf.local
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.It Va splash_bmp_load
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.Pq Dq NO
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If set to
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.Dq YES ,
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will load the splash screen module, making it possible to display a bmp image
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on the screen while booting.
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.It Va splash_pcx_load
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.Pq Dq NO
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If set to
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.Dq YES ,
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will load the splash screen module, making it possible to display a pcx image
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on the screen while booting.
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.It Va vesa_load
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.Pq Dq NO
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If set to
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.Dq YES ,
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the vesa module will be loaded, enabling bitmaps above VGA resolution to
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be displayed.
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.It Va beastie_disable
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If set to
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.Dq YES ,
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the beastie boot menu will be skipped.
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.It Va loader_logo Pq Dq Li orbbw
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Selects a desired logo in the beastie boot menu.
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Possible values are:
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.Dq Li orbbw ,
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.Dq Li orb ,
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.Dq Li fbsdbw ,
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.Dq Li beastiebw ,
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.Dq Li beastie ,
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and
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.Dq Li none .
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.It Va loader_color
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If set to
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.Dq NO ,
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the beastie boot menu will be displayed without ANSI coloring.
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.It Va entropy_cache_load
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.Pq Dq YES
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If set to
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.Dq NO ,
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the very early
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boot-time entropy file
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will not be loaded.
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See the entropy entries in
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.Xr rc.conf 5 .
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.It Va entropy_cache_name
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.Pq Dq /boot/entropy
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The name of the very early
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boot-time entropy cache file.
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.It Va cpu_microcode_load
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.Pq Dq NO
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If set to
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.Dq YES ,
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the microcode update file specified by
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.Va cpu_microcode_name
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will be loaded and applied very early during boot.
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This provides functionality similar to
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.Xr cpucontrol 8
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but ensures that CPU features enabled by microcode updates can be
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used by the kernel.
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The update will be re-applied automatically when resuming from an
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ACPI sleep state.
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If the update file contains updates for multiple processor models,
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the kernel will search for and extract a matching update.
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Currently this setting is supported only on Intel
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.Dv i386
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and
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.Dv amd64
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processors.
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It has no effect on other processor types.
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.It Va cpu_microcode_name
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A path to a microcode update file.
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.El
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.Sh OTHER SETTINGS
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Other settings that may be used in
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.Nm
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that have no default value:
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.Bl -tag -width bootfile -offset indent
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.It Va fdt_overlays
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Specifies a comma-delimited list of FDT overlays to apply.
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.Pa /boot/dtb/overlays
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is created by default for overlays to be placed in.
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.It Va kernels_autodetect
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If set to
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.Dq YES ,
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attempt to auto-detect kernels installed in
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.Pa /boot .
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This is an option specific to the Lua-based loader.
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It is not available in the default Forth-based loader.
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.El
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.Sh FILES
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.Bl -tag -width /boot/defaults/loader.conf -compact
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.It Pa /boot/defaults/loader.conf
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default settings -- do not change this file.
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.It Pa /boot/loader.conf
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user defined settings.
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.It Pa /boot/loader.conf.local
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machine-specific settings for sites with a common loader.conf.
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.El
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.Sh SEE ALSO
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.Xr rc.conf 5 ,
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.Xr boot 8 ,
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.Xr cpucontrol 8 ,
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.Xr loader 8 ,
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.Xr loader.4th 8
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.Sh HISTORY
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The file
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.Nm
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first appeared in
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.Fx 3.2 .
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.Sh AUTHORS
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This manual page was written by
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.An Daniel C. Sobral Aq dcs@FreeBSD.org .
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.Sh BUGS
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The
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.Xr loader 8
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stops reading
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.Nm
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when it encounters a syntax error, so any options which are vital for
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booting a particular system (i.e.\&
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.Dq Va hw.ata.ata_dma Ns "=0" )
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should precede any experimental additions to
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.Nm .
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