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edits
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From libnds
{| class="wikitable" border="1"
! NAME
! PHYSICAL ADDRESS
! WIDTH
|-
| REG_SDCMD
| 0x10006000
| 2
|-
| REG_SD???
| 0x10006002
| 2
|-
| REG_SDCMDARG0
| 0x10006004
| 2
|-
| REG_SDCMDARG1
| 0x10006006
| 2
|-
| REG_SDSTOP
| 0x10006008
| 2
|-
| REG_SDBLKCOUNT
| 0x1000600a
| 2
|-
| REG_SDRESP0-7
| 0x1000600c
| 2*8
|-
| REG_SDSTATUS0
| 0x1000601c
| 2
|-
| REG_SDSTATUS1
| 0x1000601e
| 2
|-
| REG_SD???
| 0x10006020
| 2
|-
| REG_SD???
| 0x10006022
| 2
|-
| REG_SDCLKCTL
| 0x10006024
| 2
|-
| REG_SDBLKLEN
| 0x10006026
| 2
|-
| REG_SDOPT
| 0x10006028
| 2
|-
| REG_SDFIFO
| 0x10006030
| 2
|}
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.
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.