Formerly only the header was defined and it was expecting the SerialPortExtLib
interface to be implemented by SerialPortLib if supported. This behaviour was
not conform to the EDK2 framework.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Olivier Martin <olivier.martin@arm.com>
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@14173 6f19259b-4bc3-4df7-8a09-765794883524