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