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You will need an AmigaDOS hard drive prep tool to prepare you hard
drives for use with OpenBSD/amiga. HDToolBox is provided with the
system software and on floppy installation disks since Release 2.0
of AmigaDOS so we will provide instructions for its use.
Preparing your hard disk with HDToolBox:
If you intend to use a harddisk larger than 4 Gb, or partitions
larger than 2Gb be advised to either get HDToolBox for AmigaDOS 3.5
or a third party harddisk preparation tool (such as HdInstTools)
from Aminet, together with the appropriate patches from
www.amiga.com to let AmigaDOS see the full size of the drive.
A full explanation of HDToolBox can be found with your
AmigaDOS manuals and is beyond the scope of this document.
Note that you will be modifying your HD. If you mess something
up here you could lose *EVERYTHING* on all the drives that
you configure. You are therefore advised to:
Write down your current configuration. Do this
by examining each partition on the drive and the
drives parameters (from Change drive type.)
Back up all partitions you want to keep.
What you need to do is partition your drives; creating at least
root, swap and /usr partitions and possibly some more for
/tmp, /var, /home or others of your own choice. (The root and
swap partitions must be on the same drive for your initial
installation. You can use other configurations after building a
customized kernel once your system is running.) Partitioning is
traditionally an area of great confusion and disagreement, and
religion plays a large role in most advice you'll get. The
author of this paragraph is a fan of large and few partitions,
normally one per disk, unless it's the root disk, where I tend
to have /, swap, /tmp, /var & /usr. I must admit that I step
aside from my normal rules of thumb very often due to the context
the machine will work in.
This should be done as the HDToolBox manual describes. One thing
to note is that if you are not using a Commodore controller you
will need to specify the device your SCSI controller uses e.g.
if you have a Warp Engine you would:
from cli,
hdtoolbox warpdrive.device
from wb set the tooltype,
SCSI_DEVICE_NAME=warpdrive.device
The important things you need to do above and beyond normal
partitioning includes (from Partition Drive section):
Marking all OpenBSD partitions as non-bootable.
Changing the file system parameters of the partitions
to OpenBSD ones. This must be done from the
partitioning section and `Advanced options' must
be enabled. To Make the needed changes:
- Click the `Adv. Options' button
- Click the `Change filesystem' button
- Choose `Custom File System'
- Turn off `Automount' if on.
- Set the dostype to one of these three choices:
root partition : 0x4e425207 ("NBR\7")
swap partition : 0x4e425301 ("NBS\1")
other partitions: 0x4e425507 ("NBU\7")
Here `other' refers to other partitions you will
format for reading and writing under OpenBSD (e.g.
/usr)
Make sure you hit the return key to enter this value
as some versions of HDToolBox will forget your entry
if you don't.
- Turn custom boot code off
- Set Reserved Blocks start and end to 0.
- Click Ok.
Mask and maxtransfer are not used with OpenBSD.
Until you compile your own kernel your swap partition
must exist on the drive that also holds your root
partition.
Once this is done OpenBSD/amiga will be able to recognize your
disks and which partitions it should use.
Choosing installation root filesystem type:
The OpenBSD/amiga operating system can be installed using two
different root filesystems: ramdisk or miniroot. The ramdisk
is strongly recommended as it requires less preparatory work.
However the ramdisk kernel requires that your system has at
least 6MB of fastmem. The miniroot requires less (installs on
a 4MB system should be possible) and has tools to make SLIP or
PPP connections, which the ramdisk doesn't, however you need
to be an experienced user to make use of these as the install
scripts doesn't deal with them. Furthermore the miniroot
install requires you to do the preparation described in the
following paragraph. To use the ramdisk install you should get
the bsd.rd kernel as well as the standard bsd one, and *do*
skip the next section!
Transferring the miniroot filesystem:
The OpenBSD/amiga installation or upgrade can use a "miniroot"
filesystem which is installed on the partition used by OpenBSD
for swapping.
Once the hard disk has been prepared for OpenBSD, the miniroot
filesystem (miniroot{:--:}OSrev.fs) is transferred to the swap partition
configured during the hard disk prep (or the existing swap
partition in the case of an upgrade). The xstreamtodev utility
provided in the "amiga/utilities" directory can be used on
AmigaDOS to transfer the filesystem for either a new installation
or an upgrade. The filesystem can also be transferred on an
existing OpenBSD (or NetBSD) system for an update by using dd.
This should only be done after booting the former OS into single-
user state. It may also be possible to shutdown to single-user,
providing that the single-user state processes are not using the
swap partition.
On AmigaDOS, the command:
xstreamtodev --input=miniroot{:--:}OSrev.fs --rdb-name=<swap partition>
where <swap partition> is the name you gave to the OpenBSD
partition to be used for swapping. If xstreamtodev is unable to
determine the SCSI driver device name or the unit number of the
specified partition, you may also need to {:-include-:} the option
"--device=<driver.name>" and/or "--unit=<SCSI unit number>".
To transfer the miniroot using an older BSD, you should be booted
up in single user state on the current system, or use the
"shutdown now" command to shutdown to single-user state. Then
copy the miniroot using dd:
dd if=miniroot{:--:}OSrev.fs of=/dev/rsdXb
where /dev/rsdXb should be the device path of the swap partition
your system is configured to use. Once the file is copied,
reboot back to AmigaDOS to boot the new OpenBSD kernel. NOTE:
the release kernel is a "generic" kernel, and requires that the
swap partition be on the same device as the root partition.
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