1Xilinx Versal
2=============
3
4Trusted Firmware-A implements the EL3 firmware layer for Xilinx Versal.
5The platform only uses the runtime part of TF-A as Xilinx Versal already has a
6BootROM (BL1) and PMC FW (BL2).
7
8BL31 is TF-A.
9BL32 is an optional Secure Payload.
10BL33 is the non-secure world software (U-Boot, Linux etc).
11
12To build:
13```bash
14make RESET_TO_BL31=1 CROSS_COMPILE=aarch64-none-elf- PLAT=versal bl31
15```
16
17To build ATF for different platform (supported are "silicon"(default) and "versal_virt")
18```bash
19make RESET_TO_BL31=1 CROSS_COMPILE=aarch64-none-elf- PLAT=versal VERSAL_PLATFORM=versal_virt bl31
20```
21
22Xilinx Versal platform specific build options
23---------------------------------------------
24
25*   `VERSAL_ATF_MEM_BASE`: Specifies the base address of the bl31 binary.
26*   `VERSAL_ATF_MEM_SIZE`: Specifies the size of the memory region of the bl31 binary.
27*   `VERSAL_BL32_MEM_BASE`: Specifies the base address of the bl32 binary.
28*   `VERSAL_BL32_MEM_SIZE`: Specifies the size of the memory region of the bl32 binary.
29
30*   `VERSAL_CONSOLE`: Select the console driver. Options:
31    -   `pl011`, `pl011_0`: ARM pl011 UART 0
32    -   `pl011_1`         : ARM pl011 UART 1
33
34*   `VERSAL_PLATFORM`: Select the platform. Options:
35    -   `versal_virt`	: Versal Virtual platform
36
37# PLM->TF-A Parameter Passing
38------------------------------
39The PLM populates a data structure with image information for the TF-A. The TF-A
40uses that data to hand off to the loaded images. The address of the handoff
41data structure is passed in the ```PMC_GLOBAL_GLOB_GEN_STORAGE4``` register.
42The register is free to be used by other software once the TF-A is bringing up
43further firmware images.
44