Re: double booting with iMac (Bondie blue, rev 1)

On 10/31/17 20:56, SFM wrote:
> Hi PPC enthusiasts !
> 
> I have embarked in the (apparently suicidal) mission of installing OpenBSD 6.2 on the very first iMac, which is running Mac OS 8.6. I also have a Mac OS X CD which I use only for partitioning through disk utility.
> 
> Progress :
> 
> I Downloaded the iso image OpenBSD 6.2 macppc and Burned it into a bootable CD,
> 
> Partitioned my only hard drive with two equally sized HFS+ partitions. Mac OS 8.6 is installed in the first one. Goal: installing OpenBSD in the second HFS+ partition, keeping my MacOS partition intact.
> 
> The problem:
> 
> Although I followed the partitioning advise on MacPPC.install, the OpenBSD installer (i do not remember anymore if it was fdisk or pdisk) states that the drive does not have a valid partition table and shows the entire space as unallocated!
> 
> The request:
> 
> Someone, anyone willing to help me make my wish come true of installing OpenBSD in this baby, could help me with the following:
> 
> 1) A brief but powerful description of the partitioning process.
> 
> 2) a brief explanation of how is one supposed to 鈥渦se Mac OS to move the bootloader to the first partition of the disk鈥, which is the last message after a successful installation (pretty shocking to read that if you just got rid of exactly that OS;  I did this mistake in the past, twice)
> 
> For both of these matters, The information contained in the installation document is simply not Enough for double booters. I wish that could be different.
> 
> Additionally, there seems to be strong disagreement on wether openfirmware allows booting from a usb stick, even more when it comes to older machines, like my iMac. Has anyone here had any successful experiences with this ?
> 
> Thank you very much in advance for any hints, comments and help !
> 
> Raymundo.-
> 

Hi,

My iBook G4 has only had OpenBSD on for the last few upgrades - as Apple 
stopped supporting Mac OS X :~) but prior to Jan 2016 I happily dual 
booted it.

To dual boot it - once you have installed OpenBSD you need to boot into 
mac and copy the ofwboot from the installation to the root of your mac 
partition - this can be done by ftp'ing the file so for 6.2 you would:

ftp ftp://ftp.eu.openbsd.org/pub/OpenBSD/6.2/macppc/ofwboot

once ofwboot is in the root partition of the HFS+ filesystem I would 
boot OpenBSD by typing:

0 > boot hd:,ofwboot

at the Open firmware prompt.

Hope fully this answers question 2.

The fdisk manpage (http://man.openbsd.org/fdisk) describes disk 
partitioning better than I can.

hth, and enjoy running OpenBSD on macppc :~)

Cheers

Fred