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Embedded Systems Architecture by Daniele Lacamera

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Multiple boot stages

Booting a target through a bootloader is useful in several cases. In a real-life scenario, being able to update the running software on devices in a remote location means that developers are able to fix bugs and introduce new features after the first version of the embedded system has been deployed.

This represents a huge advantage for maintenance when a bug is discovered in the field, or when the software has to be re-engineered to adapt to changes in requirements. Bootloaders may implement automatic remote upgrade and other useful features, such as:

  • Loading of the application image from an external storage
  • Verification of the integrity of the application image before boot
  • Failover mechanisms in case of corrupted application ...

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