Support the Raspberry Pi model B+
Detail: The activity GPIO pin has been reassigned and its sense is inverted, compared to earlier boards. More importantly, the SD card detect pin has been removed entirely, so we need to signal to the SD stack to use its new timeout-based state machine (rather than polling for card presence). Admin: Already in use in RC12a. Version 0.35. Tagged as 'BCM2835-0_35'
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