Can't get lvm/luks to boot - cannot find root partition

Hi,
I'm trying to get a dm-crypt on top of lvm to boot but without success so far. I followed http://wiki.archlinux.org/index.php/Sys … r_dm-crypt and http://wiki.archlinux.org/index.php/Ins … AID_or_LVM, everything works fine (I can mount the partition) but when I try to boot from it, it cannot find the crypted partition and fails.
USELVM="yes"
HOOKS="base udev usb usbinput lvm2 encrypt filesystems"
root=/dev/mapper/sda2 cryptdevice=/dev/sda2:root2-lvol0 ro
jan@jan ~/src/xf86-video-ati $ ll /dev/mapper/
insgesamt 0
crw-rw---- 1 root root 10, 62 21. Feb 2008 control
brw------- 1 root disk 254, 0 21. Feb 2008 root
brw------- 1 root disk 254, 1 21. Feb 2008 root2-lvol0
brw------- 1 root disk 254, 2 21. Feb 2008 sda2
/dev/mapper/root is my current encrypted / without lvm
The boot process successfully identifies the lvm /dev/mapper/root2-lvol0 and continues with hook 'encrypt' but doesn't ask me for a passphrase but goes on to hook 'filesystems' and fails then because it can't mount the correct root-partition obviously.
There's only /dev/mapper/root2-lvol0 and /dev/mapper/control when I'm in the rescue sh from initrd.
Anyone got that combination to work?
- Jan

Reboot, at the sound of the chime (not before) depress the option key, when the startup manager appears choose OSX.

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