2.1. eFuse Overview

The processor integrates eFuse space, which can be used for secure boot and user-defined area of 448 bits.

Please refer to eFuse user writable area and eFuse security setting fields for specific eFuse partitions.

Table 2.1 eFuse user writable area

Name	Size	Comment
USER	40 Bytes	User-defined areas
DEVICE_ID	8 Bytes	Serial number of device
HASH0_PUBLIC	32 Bytes	RSA public key hash value for secure boot
LOADER_EK	16 Bytes	AES encryption key for secure boot
DEVICE_EK	16 Bytes	User-defined areas can be locked
SECUREBOOT	4 Bytes	Enable secure boot

Table 2.2 eFuse security setting fields

Name	Comment
LOCK_HASH0_PUBLIC	Lock HASH0_PUBLIC, making this area unreadable
LOCK_LOADER_EK	Lock LOADER_EK, making this area unreadable
LOCK_DEVICE_EK	Lock DEVICE_EK so that this area cannot be read or written
SECUREBOOT	Enable secure boot