On Wed, 9 May 2007, Michael Dexter wrote:
> Hello all,
>
> <Sorry if this is not hard-wrapped, several terminal
screens are used>
>
> I finally figured out the problem of the ofwboot file
not being copied during installation and I am pretty sure
that an answer is not published.
>
> I take this to be either an installer bug or a
documentation bug as the following warning is given during
installation but without instructions on how to perform the
task or the variables required to perform it (on a mac mini
with 80GB drive):
>
>
> Formatting 1MB MSDOS boot partition...done.
>
> You *MUST* setup the OpenBSD disklabel to include the
MSDOS-formatted boot
> partition as the 'i' partition. If the 'i' partition is
missing or not the
> MSDOS-formatted boot partition, then the kernel
required to boot
> OpenBSD cannot be installed.
>
> # Inside MBR partition 3: type A6 start 3024 size
156298464
>
> Treating sectors 3024-156301488 as the OpenBSD portion
of the disk.
> You can use the 'b' command to change this.
>
> Initial label editor (enter '?' for help at any
prompt)
> >
>
>
> This tells us three useful things:
>
> 1. We need the MSDOS 'i' partition.
> 2. The OpenBSD partition starts at offset 3024 and...
> 3. You can use the 'b' option to change this.
>
>
> Because the installer next puts you into interactive
disklabel, it neither reports the fdisk output nor gives you
the option to type '!fdisk wd0'
>
> You can quit the installation and run 'fdisk wd0' but
it will probably not allow you to restart the installation
as you are already in the disk setup section.
>
> What fdisk WOULD report is:
>
> #: id C H S - C H S [ start:
size ]
>
------------------------------------------------------------
------------
> *0: 06 0 0 2 - 2 0 33 [ 1:
2048 ] DOS > 32MB
> 1: 00 0 0 0 - 0 0 0 [ 0:
0 ] unused
> 2: 00 0 0 0 - 0 0 0 [ 0:
0 ] unused
> 3: A6 3 0 1 - 155060 15 63 [ 3024:
156298464 ] OpenBSD
>
> Beyond confirming that the MSDOS MBR partition was
created, it tells us the missing 4th and 5th pieces of
information:
>
> 4. The MSDOS "portion of the disk" starts at
offset 1 and
> 5. Has a size of 2048.
>
> Should one try to use interactive disklable to create
the 'i' partition as instructed, disklabel will PREVENT you
from setting its correct offset of 1 as it already knows it
is in the 3rd MBR/fdisk partition starting at 3024.
>
> To resolve this, one must temporarily tell disklabel
that the "OpenBSD portion" is offset 1 and create
the MSDOS 'i' partition:
>
> > b <enter>
> Starting sector: [3024] 1 <enter>
> Size ('*' for entire disk): [156298464] <enter>
> > a i <enter>
> offset: [1] <enter>
> size: [156298464] 2048 <enter>
> FS type: [4.2BSD] MSDOS <enter>
> mount point: [none] <enter, not /mnt2 for
installation as this may go to fstab>
> > b <enter>
> Starting sector: [1] 3024 <enter, returning to where
we started>
> Size ('*' for entire disk): [156298464] <enter>
> > p <continue with normal labling from here>
> ...
> 16 partitions:
> # size offset fstype [fsize bsize
cpg]
> c: 156301488 0 unused 0 0
> i: 2048 1 MSDOS
Why go through all this trouble? The initial disk label
already
contains the correct i partition. Issue the p command at the
disklabel
prompt and you should see it when you first enter
disklabel(8) after
MBR creation.
If your initial disklabel does not contain the i partition,
that is
the bug we should try to figure out.
So please verify the output of the p command, before you do
anything
else in disklabel.
-Otto
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