View source for STM32CubeProgrammer OTP management

=== Access operation ===

To allow provisioning, all the OTPs accessible by the secure world are exposed by this partition (upper or lower OTP) without any [[BSEC_device_tree_configuration#BSEC_node_append|device tree modification]]. To restrict access to OTP, e.g. for security reason, the device can be [[STM32_MPU_ROM_code_overview#Life_cycle|{{highlight|closed}}]] or the [[OP-TEE OTP PTA overview|the provisioning TA]] can be deactivated in the final software delivery.

For read operation, the host requests the OTP partition data, and the platform replies with all the partition content.

For write operation, the host needs to send the full structure containing one or more modifications. The platform analyses each field.

First the OTP values are updated, then the OTP controls (such as lock) are updated.

After any write operation, a read must be done to update the Host information.