1 Freescale ARM64 SoCs like LS2080A have ARM TrustZone components like 2 TZPC-BP147 (TrustZone Protection Controller) and TZASC-400 (TrustZone 3 Address Space Controller). 4 5 While most of the configuration related programming of these peripherals 6 is left to a root-of-trust security software layer (running in EL3 7 privilege mode), but still some configurations of these peripherals 8 might be required while the bootloader is executing in EL3 privilege 9 mode. The following sections define how to turn on these features for 10 LS2080A like SoCs. 11 12 TZPC-BP147 (TrustZone Protection Controller) 13 ============================================ 14 - Depends on CONFIG_FSL_TZPC_BP147 configuration flag. 15 - Separates Secure World and Normal World on-chip RAM (OCRAM) spaces. 16 - Provides a programming model to set access control policy via the TZPC 17 TZDECPROT Registers. 18 19 TZASC-400 (TrustZone Address Space Controller) 20 ============================================== 21 - Depends on CONFIG_FSL_TZASC_400 configuration flag. 22 - Separates Secure World and Normal World external memory spaces for bus masters 23 such as processors and DMA-equipped peripherals. 24 - Supports 8 fully programmable address regions, initially inactive at reset, 25 and one base region, always active, that covers the remaining address space. 26
