1.\" 2.\" Copyright (c) 2020 Netflix, Inc 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.Dd April 6, 2021 26.Dt BOOT1.EFI 8 27.Os 28.Sh NAME 29.Nm boot1.efi 30.Nd UEFI chain loader 31.Sh DESCRIPTION 32.Nm 33has been deprecated and will be removed from a future release. 34.Xr loader.efi 8 35handles all its former use cases with more flexibility. 36.Pp 37On UEFI systems, 38.Nm 39loads 40.Pa /boot/loader.efi 41from the default root file system and transfers execution there. 42Some systems may need to use 43.Xr gptboot.efi 8 44when 45.Xr loader.efi 8 46cannot be used directly on the ESP (EFI System Partition). 47.Ss Initialization 48Before looking for the boot device, 49.Nm 50does the following initialization 51.Bl -bullet 52.It 53Sets up the console using the default UEFI console routines. 54.It 55Discovers all possible block devices on the system. 56.It 57Initializes all file system modules to read files from those devices 58.El 59.Ss Boot Device Selection 60.Nm 61uses the following sequence to determine the root file system for 62booting: 63.Bl -bullet 64.It 65If ZFS is configured, 66.Nm 67will search the for zpools that are bootable, preferring the zpool on 68the boot device over the others. 69.It 70If UFS is configured, 71.Nm 72will search all UFS partitions for a bootable partition. 73It will prefer the lowest numbered bootable partition on the boot 74device over all other choices. 75It will fall back to partitions on other devices if none are found. 76.El 77.Pp 78A partition is considered bootable if it can load 79.Pa /boot/loader.efi 80from it. 81Command line arguments to the next boot stage are 82read from the first existing file of 83.Pa /boot.config 84or 85.Pa /boot/config 86in that order. 87.Ss Caveats 88.Bl -bullet 89.It 90The order in which file systems are tried is undefined. 91.It 92No encryption support is available. 93.It 94There's no way to interrupt the boot process to select booting from some 95other location. 96.It 97When configuring a serial console for FreeBSD, but not for UEFI, no output 98will show up on the serial console from boot1.efi. 99.It 100There's no support for marking partitions as the preferred one. 101See 102.Xr gptboot.efi 8 . 103.It 104There's no support for boot-once functionality. 105See 106.Xr gptboot.efi 8 . 107.El 108