docs(st): one device flag for ST platforms
Due to embedded SRAM used to load BL2 and BL31 or BL32 has a limited
size, only one storage device or serial device flag should be selected
in TF-A build command line for ST platforms.
This is in line with STMicroelectionics recommendation [1] about those
compilation flags.
[1]: https://wiki.st.com/stm32mpu/wiki/How_to_configure_TF-A_BL2#Build_command_details
Signed-off-by: Yann Gautier <yann.gautier@st.com>
Change-Id: I6f6ab17d45d00289989a606d15c143e5710c64ce
diff --git a/docs/plat/st/stm32mpus.rst b/docs/plat/st/stm32mpus.rst
index 931dd57..ab6d8fe 100644
--- a/docs/plat/st/stm32mpus.rst
+++ b/docs/plat/st/stm32mpus.rst
@@ -45,6 +45,8 @@
- ``STM32MP_UART_PROGRAMMER``
- ``STM32MP_USB_PROGRAMMER``
+Only one storage or serial device should be selected in the build command line,
+to save space and not overflow SYSRAM size, or else the platform won't build or boot.
Other configuration flags:
@@ -75,4 +77,4 @@
--------------
-*Copyright (c) 2023, STMicroelectronics - All Rights Reserved*
+*Copyright (c) 2023-2024, STMicroelectronics - All Rights Reserved*