Support the Raspberry Pi model B+
Detail: For removable slots without a card detect pin, use an alternate state machine based upon timeouts to detect card removal or card changes. Note that this requires cooperation from FileCore (the same code paths as with selected floppy drives that had faulty disc changed pins) to avoid data loss by assuming that a disc might need remounting if a certain time has elapsed since the last successful operation. To avoid a significant speed penalty from deselecting and reselecting cards, remounting isn't used for rapid back-to-back operations. Admin: Already in use in RC12a. Version 0.05. Tagged as 'SDFS-0_05'
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