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The Omega2 features an SDIO/eMMC interface that enables the use of SD/MicroSD cards or eMMC storage chips.

  • Omega2: Does not have a microSD slot and does not expose the SDIO/eMMC interface.
  • Omega2+: Has a microSD slot.
  • Omega2S/2S+: Provides the SDIO/eMMC interface on exposed pins.


The Omega2 has a single SDIO interface.

Only one device can be specified on the interface port at design time: eMMC, SD/Micro-SD, or other SDIO.

The interface supports the SDXC specification for SD cards, with a maximum capacity of 2 TB and a maximum transfer speed of 300 MB/s. It also supports the eMMC5.1 interface for eMMC storage.

The microSD slot is highlighted on the Omega2+ photo below.


SD Card

When you insert an SD Card into the microSD slot you will see a message like the following:

[2757.012387] mmc0: new high speed SDHC card at address 0007
[2757.026510] mmcblk0: mmc0:0007 SD8GB 7.21GiB
[2757.033860] mmcblk0: p1

Mounting the file system

The file system from the SD card will be automatically mounted to the /mnt/ directory, with the name of the device and the file system partition name as the full path, so /mnt/mmcblk0p1 in this case:

  root@Omega-F19D:/# ls -l /mnt/mmcblk0p1/
rw-r--r 1root root 29 Nov 21 17:09 log.txt

Unmounting the file system

Before removing the SD card, you must unmount the file system.

umount /mnt/mmcblk0p1