Esteemed Colleagues:
Although it is unsupported, I have successfully installed OpenBSD on a
logical slice within the extended slice of an MBR-partitioned disk.
It took days. I may post, to this mailing list, a description of how
I figured out how to do it; but the write-up would take hours, so it
may not appear right away.
Here is the edited output from "disklabel sd0" and from "fdisk -v sd0":
m5# fdisk -v sd0
Primary GPT:
Not Found
Secondary GPT:
Not Found
MBR:
Disk: sd0 geometry: 58369/255/63 [937703088 Sectors]
Offset: 0 Signature: 0xAA55
Starting Ending LBA Info:
#: id C H S - C H S [ start:size ]
---
*0: 0C 57389 130 22 - 58369 80 30 [ 921962496:15740559 ] Win95
FAT32L
1: 07 13 0 52 - 19594 64 54 [ 208896: 314572800 ] NTFS
2: 07 0 32 33 - 13 0 51 [2048: 206848 ] NTFS
3: 05 19594 64 55 - 57389 130 21 [ 314781696: 607180800 ] Extended
DOS
Disk: sd0 geometry: 58369/255/63 [937703088 Sectors]
Offset: 314781696 Signature: 0xAA55
Starting Ending LBA Info:
#: id C H S - C H S [ start:size ]
---
0: 8E 19594 97 24 - 26121 118 45 [ 314783744: 104857600 ] Linux LVM
1: 05 26121 118 47 - 30037 215 2 [ 419641345:62916607 ] Extended
DOS
2: 00 0 0 0 - 0 0 0 [ 314781696: 0 ] unused
3: 00 0 0 0 - 0 0 0 [ 314781696: 0 ] unused
Disk: sd0 geometry: 58369/255/63 [937703088 Sectors]
Offset: 419641345 Signature: 0xAA55
Starting Ending LBA Info:
#: id C H S - C H S [ start:size ]
---
0: A6 26121 151 16 - 30037 215 2 [ 419643393:62914559 ] OpenBSD
1: 05 30037 215 5 - 31212 215 43 [ 482557954:18876414 ] Extended
DOS
2: 00 0 0 0 - 0 0 0 [ 419641345: 0 ] unused
3: 00 0 0 0 - 0 0 0 [ 419641345: 0 ] unused
[ omitted lines ]
m5# disklabel sd0
# /dev/rsd0c:
[ omitted lines ]
16 partitions:
#size offset fstype [fsize bsize cpg]
a: 57358559419643393 4.2BSD 2048 16384 12960 # /
b: 5556000477001952swap# none
c:9377030880 unused
d: 860160627273728 MSDOS# /mnt/boot
i: 206848 2048NTFS#
/Windows-Boot
j:314572800 208896NTFS# /Windows
k: 15740592921962496 MSDOS# /FreeDOS
l:104857600314783744 unknown
m5#
(If anyone is wondering about /dev/sd0l, it is the LVM volume group
containing Linux logical volumes, on which my collection of Linux
operating systems resides. These are visible on FreeBSD. If anyone
on this mailing list knows how to make Linux logical volumes visible
on OpenBSD as they are on FreeBSD, I would welcome seeing the
information on this mailing list.)
There is still, however, one problem (which may be related to the
fact that installation on a logical slice is unsupported, although I
don't see how it is): the bootloader does not work. This is not
fatal, because I can get GRUB to boot the kernel directly, with
"kopenbsd /bsd -r sd0a" (more on that later). But it is troubling.
I have two operating systems on my computer that can install GRUB:
Solaris and Linux. Both of them ought to be able to boot OpenBSD by
chainloading to the OpenBSD bootloader, thus:
set root=(hd0,6)
chainloader +1
Here is the output of "installboot -nv sd0":
m5# installboot -v sd0
Using / as root
installing bootstrap on /dev/rsd0c
using first-stage /usr/mdec/biosboot, second-stage /usr/mdec/boot
copying /usr/mdec/boot to //boot
looking for superblock at 65536
found valid ffs2 superblock
//boot is 6 blocks x 16384 bytes
fs block shift 2; part offset 419643393; inode block 56, offset 2928
expecting 64-bit fs blocks (incr 4)
master boot record (MBR) at sector 0
partition 0: type 0x0C offset 921962496 size 15740559
partition 1: type 0x07 offset 208896 size 314572800
partition 2: type 0x07 offset 2048 size 206848
partition 3: type 0x05 offset 314781696 size 607180800
extended boot record (EBR) at sector 314781696
partition 0: type 0x8E offset 2048 size 104857600
partition 1: type 0x05 offset 104859649 size 62916607
extended boot record (EBR) at sector 4
