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To be able to boot the OpenBSD/MACHINE installation program, you will
need to acquire some limited knowledge of OpenFirmware, the low-level
process that controls the microprocessor after hardware initialization
and diagnostics are performed but before control is handed to the
operating system.
To access Open Firmware you should simultaneously hold down the
Command, Option, O and F keys immediately upon booting. You will
be presented with information and a ">" prompt that will look something
like this (example taken from a Power Macintosh G4):
Apple PowerMac3,1 2.4f1 BootROM built on 02/18/00 at 09:44:35
Copyright 1994-2000 Apple Computer, Inc.
All Rights Reserved
Welcome to Open Firmware
To continue booting, type "mac-boot" and press return
To shut down, type "shut-down" and press return
ok
0 >
Important Open Firmware command examples:
boot cd:,ofwboot /OSREV/MACHINE/bsd.rd
(boot from an appropriately prepared
OpenBSD CD in the CD/DVD drive)
boot enet:,ofwboot /bsd.rd
(netboot from a pre-configured bootp/tftp/nfs
server containing the "ofwboot" and "bsd.rd"
files at the root directory of the tftp server)
boot ide1:,ofwboot /bsd
(After installation, boot /bsd from the slave
device on the second ATA bus)
mac-boot (boot into MacOS)
reset-all (reboot the machine)
shut-down (halt the machine; shutdown)
printenv (print current machine variables)
setenv (set a machine variable)
devalias (list device aliases; useful for locating other
devices in the machine such as hard drives etc)
As seen above, device aliases typically take the form of "ide", "cd"
etc. To boot to an alternative device you may substitute them
with entries from this list (example devices taken from a Power
Macintosh G4):
ultra0 = hd = master device, primary ATA bus (factory-installed drive)
ultra1 = slave device, primary ATA bus
ide0 = cd = master device, secondary ATA bus (CD/DVD drive)
ide1 = slave device, secondary ATA bus (Zip drive, if installed)
enet = motherboard ethernet device
Other Open Firmware command examples:
setenv auto-boot? false
(force the machine to wait at Open Firmware
for user input at next reboot; options are true/false)
setenv boot-device ide:,ofwboot
(force the machine to boot into OpenBSD
automatically at next reboot)
dev / (change to root level of the device tree)
pwd (show current location in the device tree)
ls (show items at current location in the device tree)
words (show methods of items at current location in the device
tree)
.properties (show properties of items at current location in the
device tree)
To reset a Power Macintosh to the factory-configure Open Firmware settings,
simultaneously hold down the Command, Option, P, R keys immediately upon
booting. Typically the machine will then attempt to load Mac OS, if
available.
Autobooting OpenBSD/MACHINE
It is possible to automatically boot into OpenBSD (selectably into MacOS)
by setting up the following:
setenv auto-boot? true
setenv boot-device hd:,ofwboot
[to save the results into nvram]
reset-all
These settings assume that the master of the first IDE bus has OpenBSD
installed on it, either in MBR format or in shared mode with ofwboot
copied into the first HFS(+) partition. It is not necessary to specify
'/bsd' on the boot line or in the boot-device variable, since it is the
default.
To boot in MacOS with this setup (works on most supported machines)
press and hold down the Alt/Option key during reboot, and select which
(MacOS/MacOS X) partition to boot in the graphical boot selector
presentes. Note that OpenBSD does not currently show up in this boot
selector except for the installation CD. This works on most machines
this has been tested with, but does not work on a Rev C (333MHz) iMac,
perhaps this feature was added to the Openfirmware ROM after that
machine.
Sharing a disk with MacOS:
OpenBSD/MACHINE is capable of booting either from a dedicated disk using
a MBR partitioned disk or sharing a disk with MacOS.
If the disk is to be shared between MacOS and OpenBSD, it is necessary
to reformat and install the MacOS partitions first, using "Drive Setup",
leaving space on the disk as an "Unused" partition.
If the disk was previously partitioned, it is possible to reuse a Partition
for OpenBSD, as long as it is not the first Partition on the disk.
The bootloader is expected to be found in that first (HFS) Partition.
For dedicated disks, MACHINE port boots off a boot program in
an MSDOS filesystem. This is set up by the install program
and no special setup is required.
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