[dm-crypt] ing rootfs without using initramfs

ebelcrom ebelcrom ebelcrom at googlemail.com
Sat Jul 20 22:03:23 CEST 2013

Hello folks,

I played around with dm-crypt without using initramfs for en-/decryption of
my root file system. The rootfs is encrypted plain with cryptsetup and the
key is stored at the disk containing the rootfs between MBR and the
partition. The kernel parameter given to it from the bootloader is
configured as it should be (cryptdevice, cryptkey, root mapper). The disk
driver (loaded before) is built-in as well as dm-crypt (loaded after). AES
support als ist built in as well as a 5 second root wait delay. The message
I got at boot time is this (cr_rootfs is the encrypted rootfs):

VFS: Cannot open root device "mapper/cr_rootfs" or unknown-block(0,0)

According to some hints in the web there is no need to have an initramfs.
Is that true? If yes what are the steps to get there and what should I keep
into account?

Any suggestions are welcome!
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