How to get very early shown console messages during boot time ?

Solution Verified - Updated -

Issue

  • How to get very early shown console messages during boot time ?
  • System stopped booting with the following message on screen:
Probing EDD (edd=off to disable)... ok
  • Would like to see more detailed booting messages on screen.

Environment

  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6

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