"Unable to find root device /dev/sda2"

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https://bbs.archlinux.org – Hi!After an update - seemingly unsuccessfull - I get dropped into a recovery shell. The messages are:/usr/lib/suspend/resume: /usr/lib/libpng14: version `PNG14_0`not found (required by /usr/lib/libsplshrender.so.1)ERROR: unable to find root device '/dev/sda2'I read that now I'm supposed to run a LiveCD and chroot something... can someone please be a little more specific here? I don't want to lose that system and I have no idea why it doesn't find my disk anymore. I just performed a pacman4 uprade, but it seems pacman4 is rather immature, leaving a system unuseable like (HowTos)