NetBSD domU cannot mount partitions

[Silas Silva <silasdb%gmail.com@localhost>]

Hello all.

I finally could make my NetBSD domU machine boot. Jim Cipar helped me and I
could get NetBSD 4.0 with the PAE kernel boot. I'm using one of the lastest
built PAE kernels (the 28 jan snapshot)

I'm facing other category of problems, though. I hope you can help me, as I'm
very new to xen and virtualization. dom0 is Linux.

First, I don't know what exactly I have to pass to the "disk=" parameter in
the machine configuration. My configuration file is below:

kernel = "/boot/netbsd-XEN3PAE_DOMU-200801280002Z"
memory = 832
name = "mist"
vif = [ 'mac=aa:00:00:00:00:11']
disk = [ 'phy:/dev/sda2,sda2,w' ]
root = 'xbd0d'

My root partition is actually xbd0a. But if I set root to the correct value,
the kernel cannot mount it and ask me for the root device. No one device
works, but when I type "xbd0d" the following happens:

It falls in the single user mode. It strangly cannot start /bin/sh and ask me
for the shell path:

Enter pathname of shell or RETURN for /bin/sh: /bin/sh
#

Then I take a look to some partitions

# disklabel xbd0
 # /dev/rxbd0d:
type: unknown
disk: Logical Volume 
label: 
flags:
bytes/sector: 512
sectors/track: 128
tracks/cylinder: 16
sectors/cylinder: 2048
cylinders: 151634
total sectors: 310546432
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/sgs]
 a:  10485760        63     4.2BSD   2048 16384     0  # (Cyl.      0*- 5120*)
 b:   1048576  10485823       swap                     # (Cyl.   5120*- 5632*)
 c: 293603877        63     unused      0     0        # (Cyl.      0*- 143361*)
 d: 310546432         0     unused      0     0        # (Cyl.      0 - 151633)
 e:   8000370 302536080 Linux Ext2      0     0        # (Cyl. 147722*- 151629*)
 f:  10485760  11534399     4.2BSD   2048 16384     0  # (Cyl.   5632*- 10752*)
 g:   1048576  22020159     4.2BSD   1024  8192     0  # (Cyl.  10752*- 11264*)
 h:  20971457  23068735     4.2BSD   1024  8192     0  # (Cyl.  11264*- 21503)
 i:  94371840  44040192     4.2BSD   1024  8192     0  # (Cyl.  21504 - 67583)
 j:  37748736 138412032     4.2BSD   1024  8192     0  # (Cyl.  67584 - 86015)
 k:  54525952 176160768     4.2BSD   1024  8192     0  # (Cyl.  86016 - 112639)
 l:  31457280 230686720     4.2BSD   1024  8192     0  # (Cyl. 112640 - 127999)
 m:  31459940 262144000     4.2BSD   1024  8192     0  # (Cyl. 128000 - 143361*)

As you can see, NetBSD can see other partitions, but when I try to mount that
I get the "invalid block" error:

# mount /dev/xbd0a /mnt
mount_ffs: /dev/xbd0a on /mnt: incorrect super block
# mount /dev/xbd0g /mnt
mount_ffs: /dev/xbd0g on /mnt: incorrect super block

I can boot netbsd from this partition perfectly when I startup the machine and
chose the NetBSD entry in the grub menu, but I can't startup it from xen.

Have anybody faced simillar problems and can help me? What would be the
correct configuration for a virtual machine running NetBSD on a Linux dom0? Is
the disk= option right?

Thank you very much.

-- 
Silas Silva - http://www.purl.org/NET/silas/site