Trusted Firmware-A for 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:
.. code:: bash
make CROSS_COMPILE=aarch64-none-elf- PLAT=zynqmp bl31
To build bl32 TSP you have to rebuild bl31 too:
.. code:: bash
make CROSS_COMPILE=aarch64-none-elf- PLAT=zynqmp SPD=tspd bl31 bl32
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
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.
Power Domain Tree
=================
The following power domain tree represents the power domain model used by TF-A
for ZynqMP:
::
+-+
|0|
+-+
+-------+---+---+-------+
| | | |
| | | |
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.
