freebsd-dev/sys/boot/i386/loader/help.i386

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# TACPI DControl ACPI module behaviour
$acpi_load
If set, the ACPI module will be loaded. Clear it with
unset acpi_load
Note that the ACPI autodetection sets a number of hints to
pass information to the ACPI module. These should not be
overridden, or system behaviour will be undefined.
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# Treboot DReboot the system
reboot
Causes the system to immediately reboot.
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# Theap DDisplay memory management statistics
heap
Requests debugging output from the heap manager. For debugging use
only.
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# Tset Snum_ide_disks DSet the number of IDE disks
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NOTE: this variable is deprecated, use root_disk_unit instead.
set num_ide_disks=<value>
When booting from a SCSI disk on a system with one or more IDE disks,
and where the IDE disks are the default boot device, it is necessary
to tell the kernel how many IDE disks there are in order to have it
correctly locate the SCSI disk you are booting from.
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# Tset Sboot_userconfig DStart Userconfig
set boot_userconfig
Requests that the kernel's interactive device configuration program
be run when the kernel is booted.
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# Tset Sroot_disk_unit DForce the root disk unit number.
set root_disk_unit=<value>
If the code which detects the disk unit number for the root disk is
confused, eg. by a mix of SCSI and IDE disks, or IDE disks with
gaps in the sequence (eg. no primary slave), the unit number can be
forced by setting this variable.
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