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-rw-r--r--docs/plat/xilinx-versal.rst10
1 files changed, 9 insertions, 1 deletions
diff --git a/docs/plat/xilinx-versal.rst b/docs/plat/xilinx-versal.rst
index 231286e7e..57a363bc9 100644
--- a/docs/plat/xilinx-versal.rst
+++ b/docs/plat/xilinx-versal.rst
@@ -14,7 +14,7 @@ To build:
make RESET_TO_BL31=1 CROSS_COMPILE=aarch64-none-elf- PLAT=versal bl31
```
-To build ATF for different platform (for now its just versal virtual "versal_virt")
+To build ATF for different platform (supported are "silicon"(default) and "versal_virt")
```bash
make RESET_TO_BL31=1 CROSS_COMPILE=aarch64-none-elf- PLAT=versal VERSAL_PLATFORM=versal_virt bl31
```
@@ -33,3 +33,11 @@ Xilinx Versal platform specific build options
* `VERSAL_PLATFORM`: Select the platform. Options:
- `versal_virt` : Versal Virtual platform
+
+# PLM->TF-A Parameter Passing
+------------------------------
+The PLM populates a data structure with image information for the TF-A. The TF-A
+uses that data to hand off to the loaded images. The address of the handoff
+data structure is passed in the ```PMC_GLOBAL_GLOB_GEN_STORAGE4``` register.
+The register is free to be used by other software once the TF-A is bringing up
+further firmware images.