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+-------------- U-Boot consoles ------------------
+
+U-Boot supports multiple consoles which may be simultaneously active.
+Depending on the configuration none, the first or all consoles are
+activated on startup, see CONSOLE_ACTIVATE_FIRST and CONSOLE_ACTIVATE_ALL
+options.
+
+During runtime the behaviour of the consoles can be controlled with the
+'active' parameter each console has. The console system recognizes three
+characters: 'i' for stdin, 'o' for stdout and 'e' for stderr. These options
+may be concatenated together as needed, so setting an 'active' parameter
+of a console to 'io' would enable it for stdout and stdin while leaving
+stderr disabled.