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-.\" Copyright (c) 2013 Warren Block
-.\" All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\" $FreeBSD$
-.\"
-.Dd February 5, 2014
-.Dt GPTBOOT 8
-.Os
-.Sh NAME
-.Nm gptboot
-.Nd GPT bootcode for UFS on BIOS-based computers
-.Sh DESCRIPTION
-.Nm
-is used on BIOS-based computers to boot from a UFS partition on a
-GPT-partitioned disk.
-.Nm
-is installed in a
-.Cm freebsd-boot
-partition with
-.Xr gpart 8 .
-.Sh IMPLEMENTATION NOTES
-The GPT standard allows a variable number of partitions, but
-.Nm
-only boots from tables with 128 partitions or less.
-.Sh PARTITION ATTRIBUTES
-.Nm
-checks and manages several attributes of GPT UFS partitions.
-.Bl -tag -width ".Cm bootfailed"
-.It Cm bootme
-Attempt to boot from this partition.
-If more than one partition has the
-.Cm bootme
-attribute set,
-.Nm
-will attempt to boot each one until successful.
-.It Cm bootonce
-Attempt to boot from this partition only one time.
-Setting this attribute with
-.Xr gpart 8
-automatically also sets the
-.Cm bootme
-attribute.
-Multiple partitions may have the
-.Cm bootonce
-and
-.Cm bootme
-attributes set.
-.It Cm bootfailed
-The
-.Cm bootfailed
-attribute marks partitions that had the
-.Cm bootonce
-attribute set, but failed to boot.
-This attribute is managed by the system.
-See
-.Sx "BOOTING"
-and
-.Sx "POST-BOOT ACTIONS"
-below for details.
-.El
-.Sh USAGE
-For normal usage, the user does not have to set or manage any of the
-partition attributes.
-.Nm
-will boot from the first UFS partition found.
-.Pp
-The
-.Cm bootonce
-attribute can be used for testing an upgraded operating system on
-an already-working computer.
-The existing system partition is left untouched, and the new version
-of the operating system to be tested is installed on another partition.
-The
-.Cm bootonce
-attribute is set on that new test partition.
-The next boot is attempted from the test partition.
-Success or failure will be shown in the system log files.
-After a successful boot of the test partition, a user script can check
-the logs and change the
-.Cm bootme
-attributes so the test partition becomes the new system partition.
-Because the
-.Cm bootonce
-attribute is cleared after an attempted boot, a failed boot will not
-leave the system attempting to boot from a partition that will never
-succeed.
-Instead, the system will boot from the older, known-working operating
-system that has not been modified.
-If the
-.Cm bootme
-attribute is set on any partitions, booting will be attempted from them
-first.
-If no partitions with
-.Cm bootme
-attributes are found, booting will be attempted from the first UFS
-partition found.
-.Sh BOOTING
-.Nm
-first reads the partition table.
-All
-.Cm freebsd-ufs
-partitions with only the
-.Cm bootonce
-attribute set, indicating a failed boot, are set to
-.Cm bootfailed .
-.Nm
-then scans through all of the
-.Cm freebsd-ufs
-partitions.
-Boot behavior depends on the combination of
-.Cm bootme
-and
-.Cm bootonce
-attributes set on those partitions.
-.Bl -tag -width ".Cm bootonce + .Cm bootme"
-.It Cm bootonce + Cm bootme
-Highest priority: booting is attempted from each of the
-.Cm freebsd-ufs
-partitions with both of these attributes.
-On each partition, the
-.Cm bootme
-attribute is removed and the boot attempted.
-.It Cm bootme
-Middle priority: booting is attempted from each of the
-.Cm freebsd-ufs
-partitions with the
-.Cm bootme
-attribute.
-.El
-.Pp
-If neither
-.Cm bootonce
-nor
-.Cm bootme
-attributes are found on any partitions, booting is attempted from the
-first
-.Cm freebsd-ufs
-partition on the disk.
-.Sh POST-BOOT ACTIONS
-The startup script
-.Pa /etc/rc.d/gptboot
-checks the attributes of
-.Cm freebsd-ufs
-partitions on all GPT disks.
-Partitions with the
-.Cm bootfailed
-attribute generate a
-.Dq boot from X failed
-system log message.
-Partitions with only the
-.Cm bootonce
-attribute, indicating a partition that successfully booted, generate a
-.Dq boot from X succeeded
-system log message.
-The
-.Cm bootfailed
-attributes are cleared from all the partitions.
-The
-.Cm bootonce
-attribute is cleared from the partition that successfully booted.
-There is normally only one of these.
-.Sh FILES
-.Bl -tag -width /boot/gptboot -compact
-.It Pa /boot/gptboot
-bootcode binary
-.It Pa /boot.config
-parameters for the boot blocks
-.Pq optional
-.El
-.Sh EXAMPLES
-.Nm
-is installed in a
-.Cm freebsd-boot
-partition, usually the first partition on the disk.
-A
-.Dq protective MBR
-.Po
-see
-.Xr gpart 8
-.Pc
-is typically installed in combination with
-.Nm .
-.Pp
-Install
-.Nm
-on the
-.Pa ada0
-drive:
-.Bd -literal -offset indent
-gpart bootcode -b /boot/pmbr -p /boot/gptboot -i 1 ada0
-.Ed
-.Pp
-.Nm
-can also be installed without the PMBR:
-.Bd -literal -offset indent
-gpart bootcode -p /boot/gptboot -i 1 ada0
-.Ed
-.Pp
-Set the
-.Cm bootme
-attribute for partition 2:
-.Bd -literal -offset indent
-gpart set -a bootme -i 2 ada0
-.Ed
-.Pp
-Set the
-.Cm bootonce
-attribute for partition 2, automatically also setting the
-.Cm bootme
-attribute:
-.Bd -literal -offset indent
-gpart set -a bootonce -i 2 ada0
-.Ed
-.Sh SEE ALSO
-.Xr boot.config 5 ,
-.Xr rc.conf 5 ,
-.Xr boot 8 ,
-.Xr gpart 8
-.Sh HISTORY
-.Nm
-appeared in FreeBSD 7.1.
-.Sh AUTHORS
-This manual page written by
-.An Warren Block Aq wblock@FreeBSD.org .