1. A method of controlling update of content in a programmable read-only memory in a system, comprising: determining a security status associated with the system, the security status being one of a secure mode and a non-secure mode; in response to detecting that the system is in secure mode, enabling a write to the programmable read-only memory; and in response to detecting that the security status is in non-secure mode, disabling a write to the programmable read-only memory.