Initializing a disk from with GPT

[Mayu Inc.]

Is it possible to initialize a disk from scratch with GPT? Using the
sequences below, and another from the disklabel64 man page, both failed.
There was a "No bootable disk error" when the machine was started. This was
a completely wiped disk before the initialization was attempted.

    # gpt destroy da0
    # gpt create da0
    # gpt add -i 1 da0
    # gpt show da0
    # disklabel64 -B -r -w da0s1
    # disklabel64 -e da0s1
      a: 1G 0 4.2BSD
      b: 32G * swap
      d: * * HAMMER2

This example from the disklabel64 man page also failed:

  # gpt destroy da0
  # gpt init -f -B da0
  # disklabel64 -B -r -w da0s1
  # disklabel64 -e da0s1
      a: 1G 0 4.2BSD
      b: 32G * swap
      d: * * HAMMER2
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