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explicitly specifies a 'com1=' or 'com2=' configuration string. This prevents users from being surprised when Xen stops domain0 from accessing serial port registers. On ia64 we still allow serial ports to get automatically configured and locked down even if no 'com1' is specified on the command line. This maintains the default preferred by the IA64 developers. Also, the method for specifying 'use existing baud rate' has changed. Instead of specifying com1=0, you must now specify e.g., com1=auto Signed-off-by: Keir Fraser <keir@xensource.com>