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First download and create installation medium for both
Here we will do an unencrypted installation, if you want to make a full disk encryption install follow the following fqa :
https://www.openbsd.org/faq/faq14.html#softraidFDE
But instead of letting fdisk auto initialize partitions follow the partitioning disk step
Press s to drop into a shell before installation
Welcome to the OpenBSD/amd64 6.9 installation program. (I)nstall, (U)pgrade, (A)utoinstall or (S)hell? s
we will use the following disk layout :
bootloader (FAT32) : 200M
OpenBSD : 50G
9front : 25G
Create the hard-drive device node
# cd /dev && sh MAKEDEV sd0
enter the partition manager
# fdisk -e sd0
Create a FAT32 partition
sd0: 1> e 1
Choose 0B (FAT32) as your partition id
Partition id : 0B Do you wish to edit in CHS mode? [n] n Partition offset [0 - xxxxxx]: [0] 1024
here I choose to make a 200MiB partition
Partition size [1 - xxxxxx]: [1] 200M
take note of where you partition end so that they don't overlap
sd0*: 1> p
Now let's do the same for our OpenBSD parition
sd0*: 1> e 2 Do you wish to edit in CHS mode? [n] n Partition id : A6 Partition offset [0 - xxxxx]: 200M Partition size [1 - xxxxxx]: [1] 50G
Don't forget to set this partition as bootable
sd0: 1> f 2
That's it for now, we will let 9front create its own partition
Write and quit :
sd0*: 1> w sd0: 1> q
create the FAT file system
# newfs_msdos sd0i
Proceed with the installation until you encounter this prompt
Use (W)hole disk MBR, whole disk (G)PT, (O)penBSD area or (E)dit? [OpenBSD] O
OpenBSD will auto-allocate a layout of virtual partitions for you, feel free to edit it if you want, here we won't
Use (A)uto layout, (E)dit auto layout, or create (C)ustom layout? [a] a
Continue the installation as you would normally do.
And reboot
Boot your 9front install medium, and follow the installation step just has specified in the fqa
http://fqa.9front.org/fqa4.html
9front should automatically dedect the available free space
At the end of the installation process at this prompt :
Task to do [bootsetup]:
drop into a shell by typing
!rc
Then we will copy the conent of the 9fat partition to our bootloader fat partition
term% dossrv -f /dev/sd0xxxx/dos term% mount -c /srv/sdos /n/dos term% 9fs 9fat term% dircp /n/9fat/ /n/dos/ term% exit
Now proceed to the bootsetup by doing the following :
Install the Plan 9 masterboot record (yes, no)[no default]: yes Mark the Plan 9 partition active (yes, no)[no default]: no
The system should reboot on OpenBSD
I haven't found a way to install a bootloader from OpenBSD itself, so instead I'm using an image of alpine
# apk add syslinux # dd if=/usr/share/syslinux/mbr.bin of=/dev/sda # syslinux /dev/sda1 # mount /dev/sda1 /mnt # cp /usr/share/syslinux/menu.c32 /mnt # cp /usr/share/syslinux/libutil.c32 /mnt # cp /usr/share/syslinux/libcom32.c32 /mnt # cp /usr/share/syslinux/chain.c32 /mnt
Activate MSDOS partition
# fdisk /dev/sda a 1 a 2 w q
Then reboot and you should have a menu with both 9front and OpenBSD