RAID boot clarification

[James Knowles]

With the improvements that RAID is undergoing, I've become a little
confused, so forgive the FAQ-ish question.

Do I understand correctly that with RAID compiled into the kernel and
persistent superblocks used, that I can boot off of a RAID drive without
initrd or anything else additional? 

If not, what is required to boot RAID? 

Sorry for the confused state of mind. :-)

J.

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