# eMMC

## Introduction

This plugin reads the sysfs attributes corresponding to eMMC devices.
It uses the kernel MMC API for flashing devices.

## Protocol

eMMC devices support the `org.jedec.mmc` protocol.

## GUID Generation

These devices use the following instance values:

* `EMMC\%NAME%`
* `EMMC\%MANFID%&%OEMID%`
* `EMMC\%MANFID%&%OEMID%&%NAME%`

## Update Behavior

The firmware is deployed when the device is in normal runtime mode, but it is
only activated when the device is rebooted.

## Vendor ID Security

The vendor ID is set from the EMMC vendor, for example set to `EMMC:{$manfid}`

## External Interface Access

This plugin requires ioctl `MMC_IOC_CMD` and `MMC_IOC_MULTI_CMD` access.