According to certain aspects, a memory module is provided having at least one output configured to be operatively coupled to a memory controller of a host computer system. The memory module can be configured to operate in at least two modes comprising an initialization mode during which the memory module executes at least one initialization sequence and an operational mode. The memory module may include a controller circuit configured to cause the memory module to enter the initialization mode. The memory module may also include a notification circuit configured to drive the at least one output while the memory module is in the initialization mode to provide at least one notification signal to the memory controller indicating at least one status of the at least one initialization sequence.