BOOT.CONFIG(5)            FreeBSD File Formats Manual           BOOT.CONFIG(5)

NAME
     boot.config - Configuration file for the boot blocks

DESCRIPTION
     The boot.config file contains options for the FreeBSD boot block code.

     When the FreeBSD boot loader runs, it searches the "a" slice of the boot
     partition for a boot.config file (as a result, slices which are missing
     an "a" partition require user intervention during the boot process).  If
     the boot.config file is found, its contents are used as the default
     configuration options for the boot block code and are echoed to the
     system console.

     A valid format of this file is to put BIOS drive number, a controller
     type, a unit number, a partition, a kernel file name, and any other valid
     boot(8) option on a single line, as it is done at the "boot:" prompt.

     The options related to the boot image selection described below and all
     the other options available for boot.config are documented in detail in
     the boot(8) manual page.

FILES
     /boot.config  parameters for the boot blocks (optional)
     /boot/config  Altnerate location for boot config information

EXAMPLES
     The command:

           # echo "-P" > /boot.config

     will activate the serial console of FreeBSD if no keyboard is present,
     otherwise video console will be used.

     The command:

           # echo "1:ad(1,a)/boot/loader" > /boot.config

     will instruct the second stage of boot(8) on the first disk to boot with
     the third boot(8) stage from the second disk.

     The command:

           # echo "1:ad(1,a)/boot/loader -P" > /boot.config

     will do both of the above.

SEE ALSO
     boot(8), loader(8)

AUTHORS
     This manual page was written by Daniel Gerzo <danger@FreeBSD.org>.

FreeBSD 13.1-RELEASE-p6        October 12, 2020        FreeBSD 13.1-RELEASE-p6