35. Xilinx Zynq UltraScale+ MPSoC

Trusted Firmware-A (TF-A) implements the EL3 firmware layer for Xilinx Zynq UltraScale + MPSoC. The platform only uses the runtime part of TF-A as ZynqMP already has a BootROM (BL1) and FSBL (BL2).

BL31 is TF-A. BL32 is an optional Secure Payload. BL33 is the non-secure world software (U-Boot, Linux etc).

To build:

make CROSS_COMPILE=aarch64-none-elf- PLAT=zynqmp bl31

To build bl32 TSP you have to rebuild bl31 too:

make CROSS_COMPILE=aarch64-none-elf- PLAT=zynqmp SPD=tspd bl31 bl32

To build TF-A for JTAG DCC console:

make CROSS_COMPILE=aarch64-none-elf- PLAT=zynqmp RESET_TO_BL31=1 bl31 ZYNQMP_CONSOLE=dcc

35.1. ZynqMP platform specific build options

  • ZYNQMP_ATF_MEM_BASE: Specifies the base address of the bl31 binary.

  • ZYNQMP_ATF_MEM_SIZE: Specifies the size of the memory region of the bl31 binary.

  • ZYNQMP_BL32_MEM_BASE: Specifies the base address of the bl32 binary.

  • ZYNQMP_BL32_MEM_SIZE: Specifies the size of the memory region of the bl32 binary.

  • ZYNQMP_CONSOLE: Select the console driver. Options:

    • cadence, cadence0: Cadence UART 0

    • cadence1 : Cadence UART 1

35.2. FSBL->TF-A Parameter Passing

The FSBL populates a data structure with image information for TF-A. TF-A uses that data to hand off to the loaded images. The address of the handoff data structure is passed in the PMU_GLOBAL.GLOBAL_GEN_STORAGE6 register. The register is free to be used by other software once TF-A has brought up further firmware images.

35.3. Power Domain Tree

The following power domain tree represents the power domain model used by TF-A for ZynqMP:

 |       |       |       |
 |       |       |       |
 v       v       v       v
+-+     +-+     +-+     +-+
|0|     |1|     |2|     |3|
+-+     +-+     +-+     +-+

The 4 leaf power domains represent the individual A53 cores, while resources common to the cluster are grouped in the power domain on the top.