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The IO interface for SDMC/NAND seems to be very similar to the DSi; see libnds for [http://sourceforge.net/p/devkitpro/libnds/ci/master/tree/source/arm7/sdmmc.c sample code] and [http://sourceforge.net/p/devkitpro/libnds/ci/master/tree/include/nds/arm7/sdmmc.h documentation].
The IO interface for SDMC/NAND seems to be very similar to the DSi; see libnds for [http://sourceforge.net/p/devkitpro/libnds/ci/master/tree/source/arm7/sdmmc.c sample code] and [http://sourceforge.net/p/devkitpro/libnds/ci/master/tree/include/nds/arm7/sdmmc.h documentation].
3DS SDMC/NAND IO registers are located at 0x10006000 and apparently mirrored at 0x10007000. It seems the 0x10007000 mirror is never used on retail units.