4 Summary

This application note describes the key-burning process commonly used by customers, specifically switching boot modes to burn the key and boot the business files normally.

This document also provides two feasible new approaches. These approaches eliminate the need for switching boot modes. Instead, the approaches leverage the redundant boot modes of the chip to achieve key-burning and business file booting with multiple power cycles. The key benefit of this approach is streamlined production processes and manual intervention. Furthermore, the hardware design from the customer no longer needs to support multiple boot modes, further simplifying the design and system BOM cost. Note that these are only suggestions and the customer must test them thoroughly.