LinuxMMC < DULG

%SECTION0{name=LinuxMMC}% Using MultiMediaCards in Linux

The MultiMediaCard (MMC) is a flash memory card standard.

Booting Linux with a MMC card connected to the %BOARD% you should find in the bootlog something like that:

<pre>
mmc0: new high speed SD card at address 0002
mmcblk0: mmc0:0002 00000 1.90 GiB
 mmcblk0: p1
</pre>

If the mmc card is detected, you should see at least the following device files:

<pre>
/dev/mmcblk0
</pre>

If there are partitions on it, you see the following device files:

<pre>
/dev/mmcblk0pX

X =[1..n] with n=number of partitions
</pre>


%IF{"HAVE_FDISK" eq "true"}%
If you have a new unintialized mmc/sd card, you can create normal partitions and filesystems on it,like you would do on a harddisk drive. 

%INCLUDE{DULGData_%BOARD%.LinuxMMCFdiskCreatepartition}%

you should see now the following device files on the %BOARDNAME%:

%INCLUDE{DULGData_%BOARD%.LinuxMMCShowdevicefiles}%

print the partition info with fdisk:

%INCLUDE{DULGData_%BOARD%.LinuxMMCFdisk}%

%ENDIF%

mount the partition:

%INCLUDE{DULGData_%BOARD%.LinuxMMCMount}%

write some files to the MMC:

%INCLUDE{DULGData_%BOARD%.LinuxMMCReadWrite}%

unmount the partition with:

%INCLUDE{DULGData_%BOARD%.LinuxMMCUmount}%