FreeBSD 9.0-Beta3 with RootFS on RAIDZ not boots after kernel rebuilding

Hi!
Please help me!
That's my problem:
I have a box Phenom 1090T + 4*2Tb HDD. I'm install on that machine FreeBSD 9.0-Beta3 amd64 with that HOWTO
All ok and works and i'm reboots several times after install. Later (13.10.2011) i'm csup latest FreeBSD sources with RELENG_9 tag and clean kernel config from GDB,WITNESS, DEBUG and other debugging options and
Code:
make buildkernel && make installkernel && reboot
After that box not booting. Tells
Code:
Trying to mount root from zfs:myzfs []...
Mounting from zfs:myzfs failed with error 2.
Loader variables:
  vfs.root.mountfrom=zfs:myzfs

I'm trying to escape to loader prompt and do:
Code:
unload
load /boot/kernel.old/opensolaris.ko
load /boot/kernel.old/zfs.ko
load /boot/loader.old/kernel
boot
But this not helps. What i need to do for solving my problem?
 
Problem solved! It's just missing
Code:
geom_part_gpt_load="YES"
in /boot/loader.conf. And to boot in system I do this:
Code:
load /boot/kernel/geom_part_gpt.ko
boot
 
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