| Freescale ARM64 SoCs like LS2080A have ARM TrustZone components like |
| TZPC-BP147 (TrustZone Protection Controller) and TZASC-400 (TrustZone |
| Address Space Controller). |
| |
| While most of the configuration related programming of these peripherals |
| is left to a root-of-trust security software layer (running in EL3 |
| privilege mode), but still some configurations of these peripherals |
| might be required while the bootloader is executing in EL3 privilege |
| mode. The following sections define how to turn on these features for |
| LS2080A like SoCs. |
| |
| TZPC-BP147 (TrustZone Protection Controller) |
| ============================================ |
| - Depends on CONFIG_FSL_TZPC_BP147 configuration flag. |
| - Separates Secure World and Normal World on-chip RAM (OCRAM) spaces. |
| - Provides a programming model to set access control policy via the TZPC |
| TZDECPROT Registers. |
| |
| TZASC-400 (TrustZone Address Space Controller) |
| ============================================== |
| - Depends on CONFIG_FSL_TZASC_400 configuration flag. |
| - Separates Secure World and Normal World external memory spaces for bus masters |
| such as processors and DMA-equipped peripherals. |
| - Supports 8 fully programmable address regions, initially inactive at reset, |
| and one base region, always active, that covers the remaining address space. |
