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dnl $OpenBSD: prep,v 1.4 2010/02/18 20:44:41 jasper Exp $
Most MACHINE systems are shipped with a Linux system installed on the disk
drive or SSD. This system will likely use two partitions, one for the
system and applications, and another for the user data. OpenBSD will in turn
need its own MBR partition.
If there is no unpartitioned space left on the disk, it will be necessary to
shrink and recreate the data partition; before installing OpenBSD/MACHINE,
you should make sure any important data on this partition is backed up.
If you intend to only use OpenBSD on your machine, please note that, at this
point, it is necessary to keep an ext2 or ext3 Linux partition, to be able
to boot the system.
Before you install your system, you should familiarize yourself with PMON,
the open source firmware and bootloader of your machine.
Entering PMON:
Upon power-up, or after a reset, a splash screen is displayed while PMON
initializes.
On Lemote systems, after PMON initializes, a text mode boot menu appears.
At this menu, you can either select one of the systems to boot with the
arrows keys and press enter, or abort the countdown sequence and get to
the PMON commandline by hitting `c'.
If you have set up your machine to automatically boot into OpenBSD,
and want to enter PMON, you should press the `Del' key or
`ESC [ G' if you are using a serial console. You must have attached a
VGA monitor for the last step, as the commands you type on the console,
will show up on the VGA monitor.
On Gdium systems, the system proceeds to immediately boot into the
operating system; to enter PMON, repeatedly press the `del' key
(on the top right corner of the keyboard) before the G-Key lits,
until the splash screen disappears and a PMON prompt appears.
dnl XXX it does not work for me anymore ?!?
dnl Another way to abort autoboot is to start the system with the G-Key
dnl removed; the system will then stop with the splash screen displayed,
dnl and pressing the `del' key will get you to the PMON prompt.
PMON command are entered at the ``PMON>'' prompt; you may correct typos
using the backspace key, and retrieve previous commands from the history
using Ctrl-P. On Lemote systems, unfortunately, there is no cursor shape
displayed, which can make command line editing quite tedious.
PMON file path concepts:
The filenames used by PMON always mention explicitly the location of
the filesystem they refer to, as well as the filesystem type. They
are constructed as
/dev/fs/<filesystem type>@<device name>/<path within the filesystem>
On Lemote systems, the internal storage (either a disk drive or an SSD)
is `wd0'. On the Gdium Liberty, the G-Key slot is `usbg0'. Other devices
connected to the USB ports are named `usb0', `usb1', etc, in the order
PMON configures them. At any time the ``devls'' command will list
the devices you can boot from. Note that it is not possible to boot from
the SD card reader.
Supported filesystems are `ext2', for Linux ext2 and ext3 filesystem
partition, and `iso9660' for CD-ROM.
As an example, the /boot/vmlinux file on the first partition of the
hard disk becomes:
/dev/fs/ext2@wd0/boot/vmlinux
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