The MMC controller is accessible through the ARM RTSM model. A filesystem can be added on a MMC file to be accessible through the UEFI firmware running on RTSM. git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12862 6f19259b-4bc3-4df7-8a09-765794883524