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108 lines
3.3 KiB
Groff
108 lines
3.3 KiB
Groff
.\"
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.\" Copyright (c) 2020 Netflix, Inc
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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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.Dd April 6, 2021
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.Dt BOOT1.EFI 8
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.Os
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.Sh NAME
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.Nm boot1.efi
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.Nd UEFI chain loader
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.Sh DESCRIPTION
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.Nm
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has been deprecated and will be removed from a future release.
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.Xr loader.efi 8
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handles all its former use cases with more flexibility.
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.Pp
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On UEFI systems,
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.Nm
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loads
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.Pa /boot/loader.efi
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from the default root file system and transfers execution there.
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Some systems may need to use
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.Xr gptboot.efi 8
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when
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.Xr loader.efi 8
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cannot be used directly on the ESP (EFI System Partition).
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.Ss Initialization
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Before looking for the boot device,
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.Nm
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does the following initialization
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.Bl -bullet
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.It
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Sets up the console using the default UEFI console routines.
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.It
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Discovers all possible block devices on the system.
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.It
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Initializes all file system modules to read files from those devices
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.El
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.Ss Boot Device Selection
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.Nm
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uses the following sequence to determine the root file system for
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booting:
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.Bl -bullet
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.It
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If ZFS is configured,
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.Nm
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will search the for zpools that are bootable, preferring the zpool on
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the boot device over the others.
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.It
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If UFS is configured,
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.Nm
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will search all UFS partitions for a bootable partition.
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It will prefer the lowest numbered bootable partition on the boot
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device over all other choices.
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It will fall back to partitions on other devices if none are found.
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.El
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.Pp
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A partition is considered bootable if it can load
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.Pa /boot/loader.efi
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from it.
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Command line arguments to the next boot stage are
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read from the first existing file of
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.Pa /boot.config
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or
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.Pa /boot/config
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in that order.
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.Ss Caveats
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.Bl -bullet
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.It
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The order in which file systems are tried is undefined.
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.It
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No encryption support is available.
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.It
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There's no way to interrupt the boot process to select booting from some
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other location.
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.It
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When configuring a serial console for FreeBSD, but not for UEFI, no output
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will show up on the serial console from boot1.efi.
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.It
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There's no support for marking partitions as the preferred one.
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See
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.Xr gptboot.efi 8 .
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.It
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There's no support for boot-once functionality.
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See
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.Xr gptboot.efi 8 .
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.El
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