xref: /freebsd/stand/man/boot1.efi.8 (revision eac7052fdebb90caf2f653e06187bdbca837b9c7)
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25.\" $FreeBSD$
26.\"
27.Dd September 1, 2020
28.Dt BOOT1.EFI 8
29.Os
30.Sh NAME
31.Nm boot1.efi
32.Nd UEFI chain loader
33.Sh DESCRIPTION
34.Nm
35has been deprecated and will be removed from a future release.
36.Xr loader.efi 8 handles all its former use cases with more flexibility.
37.Pp
38On UEFI systems,
39.Nm
40loads
41.Pa /boot/loader.efi
42from the default root file system and transfers execution there.
43.Ss Initialization
44Before looking for the boot device,
45.Nm
46does the following initialization
47.Bl -bullet
48.It
49Sets up the console using the default UEFI console routines.
50.It
51Discovers all possible block devices on the system.
52.It
53Initializes all file system modules to read files from those devices
54.El
55.Ss Boot Device Selection
56.Nm
57uses the following sequence to determine the root file system for
58booting:
59.Bl -bullet
60.It
61If ZFS is configured,
62.Nm
63will search the for zpools that are bootable, preferring the zpool on
64the boot device over the others.
65.It
66If UFS is configured,
67.Nm
68will search all UFS partitions for a bootable partition.
69It will prefer the lowest numbered bootable partition on the boot
70device over all other choices.
71It will fall back to partitions on other devices if none are found.
72.El
73.Pp
74A partition is considered bootable if it can load
75.Pa /boot/loader.efi
76from it.
77Command line arguments to the next boot stage are
78read from the first existing file of
79.Pa /boot.config
80or
81.Pa /boot/config
82in that order.
83.Ss Caveats
84.Bl -bullet
85.It
86The order in which file systems are tried is undefined.
87.It
88No encryption support is available.
89.It
90There's no way to interrupt the boot process to select booting from some
91other location.
92.It
93When configuring a serial console for FreeBSD, but not for UEFI, no output
94will show up on the serial console from boot1.efi.
95.It
96There's no support for marking partitions as the preferred one.
97.It
98There's no support for boot-once functionality.
99.El
100