Adapt to release version of Raspberry Pi 2 firmware
Detail: The board revision scheme has changed since pre-release firmware, so the previous version of the SD code would have misidentified a Pi 2 (as well as the model A+) as a Compute module. It looks like in future, board revisions could be a more meaningful bitfield rather than the order-of- release index that's been used up to now, but at this point we can still manage with a cunning combination of CMP and TEQ tests. Note that the GPIO part of the HAL hasn't yet been updated to be aware of the new board revisions. Version 0.41. Tagged as 'BCM2835-0_41'
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