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fwupd/plugins/emmc/README.md
daniil-lunev ab8a0533d8
Add eMMC guids to include FW version 
Those are required if we need to re-map FW versions with quirks. Some
devices physical version number are not consecutively mapped to logical
version number.
2022-06-22 15:58:57 +01:00

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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\%NAME%&%REV%
  • EMMC\%MANFID%&%OEMID%
  • EMMC\%MANFID%&%OEMID%&%NAME%
  • EMMC\%MANFID%&%NAME%&%REV%
  • EMMC\%MANFID%&%OEMID%&%NAME%&%REV%

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.