Understanding the CID on Linux MMC Block Devices

MMC block devices are used in a variety of embedded and mobile platforms, and they’re becoming increasingly popular in higher-end computing platforms as well. In addition to providing storage, MMC devices can also store important information like the CID (Card Identification Register). It is important to understand the CID on these devices, as it can be used to identify, authenticate and secure a device.

This guide will provide an overview of the CID, how to read it, and how to use it in Linux.

What is the CID on a MMC Block Device?

The CID (Card Identification Register) is a 128-bit value stored on a MMC block device. It is unique to each device, and contains a variety of information about the device and its manufacturer. The information includes things like the manufacturer ID, device type, model, serial number, and even the firmware revision.

How to Read the CID on a MMC Block Device

To read the CID on a MMC block device, you will need to use the Linux command line.

  1. Open a terminal window.
  2. Type the following command: sudo mmc-utils cid0 show

3.The command will output the entire CID register as a 128-bit hexadecimal value.

How to Use the CID on a MMC Block Device

The CID can be used to identify and authenticate a MMC block device. For example, if a device is suspected of being counterfeit, the CID can be used to verify the device’s authenticity.

It can also be used for security purposes. You can use the CID to create secure keys for encryption and authentication, or to detect tampering or unauthorized access.

FAQ

Q: What is the CID on a MMC Block Device?

A: The CID (Card Identification Register) is a 128-bit value stored on a MMC block device. It is unique to each device, and contains a variety of information about the device and its manufacturer.

Q: How do I read the CID on a MMC Block Device?

A: To read the CID on a MMC block device, you will need to use the Linux command line. Open a terminal window and type the following command: sudo mmc-utils cid0 show

Q: How can I use the CID on a MMC Block Device?

A: The CID can be used to identify and authenticate a MMC block device. It can also be used for security purposes, such as creating secure keys for encryption and authentication, or detecting tampering or unauthorized access.

Sources

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