The boot image can contain address-data pairs that initialize control registers during the BootROM handover to user code. Unintended access to illegal addresses is enabled.
When a boot image address-data pair writes outside of its subset of addresses, the system generates a lockdown situation and a BootROM error code to generated.
The registers that are accessible during the handover depends on the boot mode (secure versus non-secure) and the device revision as shown in the table.
| Boot Mode | Allowed Addresses: 7z020 CES 7z045 CES | Allowed Addresses: Design intention |
| Non-Secure | E000_0000 to F800_6FFF | E000_1000 to E000_1FFF E010_0004 to E010_0FFF F800_0100 to F800_01B0 |
| F800_8000 to FFEF_FFFF | F800_6000 to F800_6FFF | |
| Secure | F800_0100 to F800_01B4 | F800_0100 to F800_01AF |
| AR# 52017 | |
|---|---|
| Date | 06/13/2018 |
| Status | Active |
| Type | Design Advisory |
| Devices | |