MMC tools introduction

There is one MMC test tools called mmc-utils, which is maintained by Ulf Hansson, you can find it at the below public git repository:


The mmc-utils tools can do the following:

  • Print and parse extcsd data.

  • Determine the eMMC writeprotect status.

  • Set the eMMC writeprotect status.

  • Set the eMMC data sector size to 4KB by disabling emulation.

  • Create general purpose partition.

  • Enable the enhanced user area.

  • Enable write reliability per partition.

  • Print the response to STATUS_SEND (CMD13).

  • Enable the boot partition.

  • Set Boot Bus Conditions.

  • Enable the eMMC BKOPS feature.

  • Permanently enable the eMMC H/W Reset feature.

  • Permanently disable the eMMC H/W Reset feature.

  • Send Sanitize command.

  • Program authentication key for the device.

  • Counter value for the rpmb device will be read to stdout.

  • Read from rpmb device to output.

  • Write to rpmb device from data file.

  • Enable the eMMC cache feature.

  • Disable the eMMC cache feature.

  • Print and parse CID data.

  • Print and parse CSD data.

  • Print and parse SCR data.