04816a15fb
A future change in lualoader may take some liberties with the loader_conf_files in the name of efficiency; namely, it may start omitting it from the loader environment entirely so that it doesn't need to worry about maintaining any specific value. This variable has historically been incredibly volatile anyways, as it may get set to completely different values in any given configuration file to trigger a load of more files. Document now that we may not maintain it in the future, but perhaps we'll reserve the right to change our minds and eventually formally export all of the loader configuration files that were read using this variable. MFC after: 3 days
379 lines
11 KiB
Groff
379 lines
11 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 April 29, 2020
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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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.Ar loader_conf_files
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should be treated as write-only.
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One cannot depend on any value remaining in the loader environment or carried
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over into the kernel environment.
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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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