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Installation is supported from several media types, including:
CD-ROM (NOT supported if booting from floppy)
FFS partitions
Tape
Remote NFS partition (NOT supported if booting from floppy)
FTP
HTTP
If you have the OpenBSD CD-ROM distribution (and a CD-ROM drive), you
may be able boot from it. If you can boot from the CD-ROM,
you are home free and can proceed to the installation steps. If not,
you will need to do some setup work to prepare a bootable image, either
a floppy, hard drive, or compatible net boot server.
In addition to the bootable image, you also need to consider how to
access the binary distribution sets to actually install the system.
If you have the OpenBSD CD-ROM distribution you can either access the
CD-ROM directly from the bootable image or remotely mounted on another
system via NFS.
Although you can access the distribution sets directly from the CD-ROM or
from one of the FTP mirrors over the internet, you may wish to transfer
the sets to a local FTP or NFS server, or copy them to a partition on
the target system's disk.
OpenBSDXferFloppyFromDOS
OpenBSDXferFloppyFromUNIX
Creating a bootable hard disk using SunOS, Solaris or other Un*x-like system:
If you don't have a floppy drive you can copy the floppy
installation image "floppy{:--:}OSrev.fs" or the mini-root "miniroot{:--:}OSrev.fs"
onto the hard disk you intend to boot on. Traditionally, the
way to do this is to use dd(1) to place the bootable filesystem
image in the "swap" partition of the disk (while running in
single user mode), and then booting from that partition.
Using the "b" partition allows you to boot without overwriting
any useful parts of the disk, you can also use another partition,
but don't used the "a" or "c" partition without understanding
the disklabel issues described below under "incompatible systems".
This requires that you be running SunOS, Solaris, OpenBSD or NetBSD
which have a compatible view of SunOS disk labels and partitions.
Use the dd(1) utility to copy the file to the hard drive.
The command would likely be, under SunOS:
dd if=floppy{:--:}OSrev.fs of=/dev/rsd0b bs=36b
- or -
dd if=miniroot{:--:}OSrev.fs of=/dev/rsd0b bs=36b
and under Solaris:
dd if=floppy{:--:}OSrev.fs of=/dev/c0t0d0s1 bs=36b
- or -
dd if=miniroot{:--:}OSrev.fs of=/dev/c0t0d0s1 bs=36b
The blocksize is arbitrary as long as it's a multiple of 512-bytes
and within the maximum supported by the driver, i.e. bs=126b may
not work for all cases. Again, device/partition names may vary,
depending on the OS involved.
If you are preparing the hard drive on an incompatible system or
don't care about the hard disk contents, you can also install the
bootable image starting at the beginning of the disk. This lets
you prepare a bootable hard-drive even if don't have a working
operating system on your machine, but it important to understand
that the bootable image installed this way includes a "disk label"
which can wipe out any pre-existing disklabels or partitioning for
the drive.
If you're starting with a virgin disk and trying to do this under
SunOS, use format(8) and newfs(8) to set up the partitions and
mark the intended partition as an normal partition type. If you're
using OpenBSD, perhaps on another architecture, OpenBSD will
create a "fictitious label" that will let you access the whole
disk.
The floppy image is used only for booting, and can be placed in
a partition that will be overwritten during the install process,
since it actually runs off a ram-disk image in the kernel. In
contrast the miniroot is a normal unix root filesystem and you
must place in a partition that will not be overwritten until you've
completed the installation process.
To copy the floppy image to the hard disk, preserving SunOS,
Solaris, NetBSD or OpenBSD labels:
Under SunOS:
dd if=floppy{:--:}OSrev.fs of=/dev/rsdXc bs=1b skip=1 seek=1
and Solaris:
dd if=floppy{:--:}OSrev.fs of=/dev/rdsk/c0tXd0s2 \
bs=1b skip=1 seek=1
You need to be sure that your version of dd(1) supports the
skip and seek operands, otherwise you can try a technique like:
dd if=/dev/rsdXc of=/tmp/label bs=1b count=1
dd if=floppy{:--:}OSrev.fs of=/dev/rsdXc bs=36b
dd if=/tmp/label of=/dev/rsdXc bs=1b count=1
In either case, you've created a situation where the disklabel
and the filesystem information don't agree about the partition
size and geometry, however the results will be usable.
Creating a network bootable setup using SunOS or other Un*x-like system:
The details of setting up a network bootable environment vary
considerably, depending on the network's host. Extract the
OpenBSD diskless(8) man page from the man{:--:}OSrev.tgz distribution
set or see the copy on the OpenBSD web page. You will also
need to reference the relevant man pages or administrators guide
for the host system.
Basically, you will need to set up reverse-arp (rarpd) and boot
parameter (bootpd) information and make the OpenBSD bootblock,
kernel/miniroot partition, and a swap file available as required
by the netboot setup.
OpenBSDXferPrelude
OpenBSDXferBareTape(xbase xfont xserv xshare)
OpenBSDXferNFS
OpenBSDXferFFS
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