gptzfsboot error using HP Smart Array P410i Controller

Hello,

The initial reboot followed the installation of ZFS-only version 5/28 system 
reports error:

Attempting Boot From Hard Drive (C:)                                            
gptzfsboot: error 1 lba 32                                                      
gptzfsboot: error 1 lba 1                                                       
gptzfsboot: No ZFS pools located, can't boot

The same installation procedure on older ProLiant with Compaq Smart Array 5i
do not cause any problems.

The system has been installed based on FreeBSD 8.2-20110731-SNAP i386 802510.
The P410i Controller presents two units, and the disk da0 has been partitioned as follow:

gpart destroy -F /dev/da0
dd if=/dev/zero of=/dev/da0 bs=1024 count=10000
gpart create -s GPT /dev/da0
gpart add -b 32K -s 64K -t freebsd-boot -l disk0boot /dev/da0
gpart add -s  30G -t freebsd-zfs  -l disk0 /dev/da0
gpart add -s   4G -t freebsd-swap -l swap0 /dev/da0
gpart bootcode -b /boot/pmbr -p /boot/gptzfsboot -i 1 /dev/da0
gpart set -a bootme -i 1 /dev/da0

Early experimentation show the following footprint:

Attempting Boot From CD-ROM                                                     
Attempting Boot From Hard Drive (C:)                                            
probe_drive(360): drive 0x0: type 0: unit 0: slice 0: part 0:  <-- dsk.drive=0 instead of 0x80 ?
vdev_probe(): off=16384, sizeof(vdev_phys_t)=114688
vdev_read_phys(): reading 114688 bytes at 0x4000 to            <-- *buf is empty                             
gptzfsboot: error 1 lba 32                                     <-- why lba is not zero ?                 
drvsize(): packet.count=16, off=0, seg=8192, lba=32                             
drvsize(): dsk->drive=0, type=0, unit=0, slice=0, part=0, init=0, start=0
vdev_read_phys(): rc from vdev->v_phys_read =4294967295        <-- -1                        
gptzfsboot: error 1 lba 1                                                       
drvsize(): packet.count=1, off=0, seg=8704, lba=1                               
drvsize(): dsk->drive=0, type=0, unit=0, slice=0, part=0, init=0, start=0       
main(): retun from probe_drive(): spa_name=: kname=: drive=0:                   
probe_drive(360): drive 0x81: type 0: unit 1: slice 0: part 0:  <-- disk da1 is empty                 
vdev_probe(): off=16384, sizeof(vdev_phys_t)=114688                             
vdev_read_phys(): reading 114688 bytes at 0x4000 to    <-- *buf is empty                       
vdev_read_phys(): rc from vdev->v_phys_read =0                                  
probe_drive(390): drive 0x81: type 0: unit 1: slice 0: part 0:                  
main(): spa_name=, kname=,drive=129:                  <-- da1 (0x81) do not contain any ZFS informations                                 
gptzfsboot: No ZFS pools located, can't boot                              

Best regards,

Christoph