Thanks Trammel, that sounds like just what I'm looking for!
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The Heads Linux runtime can mount lvm encrypted drives (along with lots of other features) and needs 7 MB for coreboot, the kernel and initrd. If you drop suport for gpg+yubikey, network drivers and a few other things it can fit into 4 MB.
https://github.com/osresearch/heads
-- Trammell
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