Disable asking for a passphrase without having to re-make the encrypted partition

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http://serverfault.com – I have a server which I set up with its root partition totally encrypted. I urgently need to disable the passphrase dialog at startup because it is not letting the server boot up after an electricity cut, it happened already. Is there any way to make the system boot automatically into the encrypted system without asking for the passphrase? maybe passing the passphrase as argument to some kernel parameter, I have not found any info about something like this though. Thanks. (HowTos)