Ok, so you have a bunch of executables and a table of pre-computed CRC's. 

No, you have a bunch of executables, and for each you have a crypto hash
signed with a private key.

You could store the public key in the secure rom, but this guy wants to use
a smart card, presumably because he wants to be able to re-key.  Of course
the card and the secure hardware still have to share a key (or key pair) so
they can mutually authenticate.
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Linux Smart Card Developers - M.U.S.C.L.E.
(Movement for the Use of Smart Cards in a Linux Environment)
http://www.linuxnet.com/smartcard/index.html
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