GPT boot with ZFS RAIDZ "ZFS: i/o error - all block copies unavailable"

Hi,

I want to ask if there is something new in adding support to 
gptzfsboot/zfsboot for reading gang-blocks?

 From Sun's docs:

Gang blocks

When there is not enough contiguous space to write a complete block, the ZIO
pipeline will break the I/O up into smaller 'gang blocks' which can later be
assembled transparently to appear as complete blocks.

Everything works fine for me, until I rewrite kernel/world after system 
upgrade to latest one (releng_8). After this am I no longer able to boot 
from zfs raidz1 pool with following messages:

 >/ ZFS: i/o error - all block copies unavailable
/>/ ZFS: can't read MOS
/>/ ZFS: unexpected object set type lld
/>/ ZFS: unexpected object set type lld
/>/
/>/ FreeBSD/i386 boot
/>/ Default: z:/boot/kernel/kernel
/>/ boot:
/>/ ZFS: unexpected object set type lld
/>/
/>/ FreeBSD/i386 boot
/>/ Default: tank:/boot/kernel/kernel
/>/ boot:
//
/I presume it's the same issue as talked in june-2009 current mailing 
list 
http://lists.freebsd.org/pipermail/freebsd-current/2009-June/008589.html

Any success in that matter?

Thnx for answer.

vaLin