serial: Separate the serial hardware init and the serial console init.

You might want to use the serial hardware for something other than a console,
or you might want to intercede in the serial stream to wrap it in another
protocol. This is what you'd do to send output to GDB while using it to debug
the payload.

Change-Id: I2218c0dbb988dacb64e5bdaf5d92138828eff8b6
Signed-off-by: Gabe Black <>
Reviewed-by: Ronald Minnich <>
Reviewed-by: David Hendricks <>
Commit-Queue: Gabe Black <>
Tested-by: Gabe Black <>
(cherry picked from commit da9ab46d974745125fe7d8b29ce43336c3586cd5)
Signed-off-by: Isaac Christensen <>
Tested-by: build bot (Jenkins)
3 files changed