Installing to a gpt disk?

Hello,

I am just wondering, wether installation on gpt is supported on alpha 
[for 9.1]? Or, not unlikely, that it is just me not doing it right?

I've tried two installations, one with manual partitioning before and 
one with sysinst doing extended partitioning. The installation itself 
does not complain, but trying to boot afterwards ends in:

...
jumping to bootstrap code

NetBSD/alpha 9.1 FFS Primary Bootstrap
Can't open /boot.

PRIMARY BOOTSTRAP FAILED!

 >>>

Looking at the disk straight after install, right after exiting sysinst 
for reboot:

# dkctl sd0 listwedges
/dev/rsd0: 2 wedges:
dk0: 976e2174-565a-4100-854a-b65e9b08c3a1, 8388544 blocks at 64, type: ffs
dk1: 4f0cdf5f-f088-4461-819e-10ebee76ecc5, 4194240 blocks at 8388672, 
type: ffs


but:

# gpt show sd0
GPT not found, displaying data from MBR.

      start      size  index  contents
          0  17916207         Unused
   17916207        32         Sec GPT table
   17916239         1         Sec GPT header



and disklabel sd0:

....
drivedata: 0

3 partitions:
#        size    offset     fstype [fsize bsize cpg/sgs]
  c:  17916240         0     unused      0     0        # (Cyl.      0 - 
  15119*)
disklabel: boot block size 0
disklabel: super block size 0


and of course, after a reboot, the wedges are gone as well.

In addition, when using extended partitioning, after having finished 
creating the partitions, it jumps straight to the set selection. 
However, without newfs (installflags and newfs flags have of course 
beeen set. Also boot for /).

So I have to leave sysinst and restart and then choose use existing gpt 
partitions. This of course ends in above scenario.

Any hint what I might be missing?