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5 Verification Schemes
This section discusses the various methods of application verification provided to the users by the bootloader module.

1 MCC Melody Bootloader: 8-bit
2 User Interface
3 Unified Bootloader Host Application (UBHA)
4 Use Case Examples

This section explains how to configure various bootloaders using MPLAB® X IDE and MCC Melody.
5 Verification Schemes
This section discusses the various methods of application verification provided to the users by the bootloader module.
- 5.1 Check Reset Vector
  
  In this method the bootloader will check for a non-void value at a predefined location within the end application’s reset vector.
- 5.2 Check Status Byte
  
  In this method the bootloader and the host application will communicate program status through a reset byte value, also known as a State Flag or Status Byte.
- 5.3 Checksum
  
  In this method the application image will be verified by calculating a checksum on the application space and comparing the result to a pre-calculated checksum in the bootloader. To learn more about checksum, read this reference.
- 5.4 Cyclic Redundancy Check
  
  In these methods the bootloader uses a CRC signature for application validation. To learn more about the steps for the CRC verification of memory, refer to this reference.
6 Bootload Communication Protocol: 8-bit
7 References
Microchip Information

5 Verification Schemes

This section discusses the various methods of application verification provided to the users by the bootloader module.

Verification Overview

Before the bootloader launches an application, it will verify that there is a valid application image loaded into memory. This verification step can take many different forms. This section discusses each of the verification methods implemented in this bootloader library, how each works, and some of the engineering considerations when selecting a verification method. Refer to each sub-section for the discussion of each verification method.

Verification Methods

The online versions of the documents are provided as a courtesy. Verify all content and data in the device’s PDF documentation found on the device product page.