I want to mount OpenBSD filesystems. I read that it is not supported.

Is it supported?

If not, can anyone share any suggestions on where to get started in trying
to be able to do this?

This is what OpenBSD 3.1 sees:

# using MBR partition 3: type A6 off 63 (0x3f) size 2491713 (0x260541)
# /dev/rwd0c:
type: ESDI
disk: ESDI/IDE disk
label: Conner Periphera
flags:
bytes/sector: 512
sectors/track: 63
tracks/cylinder: 16
sectors/cylinder: 1008
cylinders: 2477
total sectors: 2496876
rpm: 3600
interleave: 1
trackskew: 0
cylinderskew: 0
headswitch: 0		# microseconds
track-to-track seek: 0	# microseconds
drivedata: 0

16 partitions:
#        size   offset    fstype   [fsize bsize   cpg]
  a:  2400000       63    4.2BSD     1024  8192    16 	# (Cyl.    0*- 2381*)
  b:    96813  2400063      swap                      	# (Cyl. 2381*- 2477*)
  c:  2496876        0    unused        0     0       	# (Cyl.    0 - 2477*)

This is what NetBSD/i386 1.5.3 (rescue-small disk) sees:

# /dev/rwd0d:
type: ESDI
disk: wd0s1
label:
flags:
bytes/sector: 512
sectors/track: 63
tracks/cylinder: 255
sectors/cylinder: 16065
cylinders: 155
total sectors: 2496816
rpm: 3600
interleave: 1
trackskew: 0
cylinderskew: 0
headswitch: 0		# microseconds
track-to-track seek: 0	# microseconds
drivedata: 0

8 partitions:
#        size   offset     fstype   [fsize bsize cpg/sgs]
  a:    65536        0     4.2BSD        0     0     0   # (Cyl.    0 - 4*)
  b:   183712    65536       swap                        # (Cyl.    4*- 15*)
  c:  2496816        0     unused        0     0         # (Cyl.    0 - 155*)
  e:    61440   249248     4.2BSD        0     0     0   # (Cyl.   15*- 19*)
  f:  2186128   310688     4.2BSD        0     0     0   # (Cyl.   19*- 155*)

What is the preferred mailing list to discuss this?

Thanks,

   Jeremy C. Reed
   http://bsd.reedmedia.net/