I tried the new option "options RDRAND_RNG" on my SOHO server, equipted with a Intel i3-3220 "Ivy Brdige" CPU, which is supposed to have the Bull Mountain random number generator as a piece of hardware in its uncore.
Enabling the kernel option doesn't reveal any presence of such a hardware number generator. "sysct kern.random" always reports kern.random.adaptors: yarrow By intentionally disallowing yarrow via commenting out options YARROW_RNG, the box reports "no adaptors loaded". So, either this Ivy Bridge has been castrated and ripped off by Intel of its RNG or FreeBSD isn't capable of detecting it properly or I'm incapable of properly configure the kernel.
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