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Unfortunately, there's two SD interfaces on the board, and the one that does eMMC (or the SD card on a normal Pi) can only do storage and can't do SDIO. The 2nd
by james_a_craig 10y ago
Unfortunately, there's two SD interfaces on the board, and the one that does eMMC (or the SD card on a normal Pi) can only do storage and can't do SDIO. The 2nd interface is used for the wireless on the Pi 3, but that one's brought out externally on the CM, so you can't really do that.
The answer is to put the wireless on the carrier board for the CM, of course, but that's awkward because of the regulatory requirements on wireless bits.