1. VFS: cannot open root device "804" or unknown-block (8,4): error -6
  2. please append a correct "root=" boot option; here are the available partitions;
  3. kernel panic - not syncing; VF Unable to mount root fs on unknown-block (8,4)
  4. Pid: 1 comm: swapper/0 Not tainted 3.4.9-gentoo