====== Introduction ======
Tired of Systemd I will try to install OpenBSD in dualboot with windows 7 on my x230 Tablet

====== Downloads ======
[[http://www.openbsd.org/ftp.html#http|Install58.iso]]

====== Install ======
Boot on CD\\
I use the same schema as for Linux:
  * mSATA (1) 256GB for Windows/openBSD
  * SATA (0) 500GB for swap/var/home and a Data (shared) partition

^ Disk      ^ Partition       ^ Format          ^ Size     ^ Mount Point ^
|1      | 1         | NTFS   | 1.5GB | SYSTEM_DRV |
|1 | 2 | NTFS | 175GB | Windows7_OS |
|1 | 3 | UFS | 61GB | OpenBSD /|
|0 | 1 | UFS | 160GB | OpenBSD swap (4g) /var (10g) /home|
|0 | 2 | NTFS | 309GB | DATA |

===== Warnings =====
  * :!: flag bootable the / partition of OpenBSD to be able to reboot on it :!:

===== mSATA SSD =====
Edit 3rd partition:
<code>
Initialyze sd1
(E)dit
fdisk> e 2
Partition id : A6
fdisk> flag 2
fdisk> w
fdisk> q
</code>
Mount as /
<code>
Label editor
> a
partition a
FS type 4.2BSD
mount point: /
> q
</code>

===== SATA =====
Edit first partition
<code>
Initialyze sd0
(E)dit
fdisk> e 0
Partition id : A6
fdisk> w
fdisk> q
</code>
Create /swap (4g) /var (10g) /home (remaining space)
<code>
Label editor
> a
partition a
size: 4g
FS type swap

> a
partition b
size: 10g
FS type 4.2BSD
mount point: /var

> a
partition d
size:
FS type 4.2BSD
mount point: /home
> q
</code>

===== Sets =====
Select all :) \\
Installation goes from cd0\\
at the end ... reboot!

===== Create the pbr file =====
Insert a FAT 32 USB key to copy the boot file!!!
<code>
disklabel sd2
</code>
mount the key
<code>
mount /dev/sd2i /mnt
</code>
Create the openbsd.pbr file
<code>
dd if=/dev/rsd1a of=openbsd.pbr bs=512 count=1
</code>
Copy to USB
<code>
cp openbsd.pbr /mnt/.
</code>
Flag back Windows partition as bootable:
<code>
fdisk -e sd1
fdisk> flag 0
fdisk> w
fdisk> q
</code>
Reboot under windows


===== Windows bootloader =====
Start cmd as administrator
<code>
bcdedit /create /d "OpenBSD" /application bootsector
</code>
Note the nice string returned ... in this example it will be {0154a872-3d41-11de-bd67-a7060316bbb1}
<code>
C:\Windows\system32> bcdedit /set {0154a872-3d41-11de-bd67-a7060316bbb1} device boot
The operation completed successfully.

C:\Windows\system32> bcdedit /set {0154a872-3d41-11de-bd67-a7060316bbb1} path \openbsd.pbr
The operation completed successfully.

C:\Windows\system32> bcdedit /set {0154a872-3d41-11de-bd67-a7060316bbb1} device partition=c:
The operation completed successfully.

C:\Windows\system32> bcdedit /displayorder {0154a872-3d41-11de-bd67-7060316bbb1} /addfirst
The operation completed successfully.

C:\Windows\system32> bcdedit /timeout 10
The operation completed successfully.

</code>
Reboot!
====== Troubleshooting ======
Boot the install CD and type:
<code>
b sd0a:/bsd
</code>


====== References ======

  * http://www.openbsd.org/faq/faq4.html#Multibooting
  * http://www.openbsdsupport.org/dualboot.html
  * http://karlbsd.blogspot.fr/2011/11/50-amd64-k43u-dual-booting-openbsd-50.html
  * http://cromwell-intl.com/linux/multiboot-windows-openbsd/
  * http://unix.stackexchange.com/questions/138729/centrino-n-6300-openbsd-5-5-no-link - original issue wiht openBSD 5.5