TL-DR: "Not on OpenBSD"
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OpenBSD is not possible on the Raspberry PI 2 Model B (ARM v7). Like its predecessor, it requires in-core binary objects which are unacceptable to the Project. See the very long discussion that begins
here.
Current status (and associated devices) for OpenBSD/armv7 can be found
here. Other ARM-based archictures include
landisk,
armish,
zaurus, and the discontinued
cats.