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docs(st): one device flag for ST platforms

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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
This commit is contained in:
Yann Gautier 2024-03-19 10:40:12 +01:00
parent 57249e7758
commit 40ed77feca
1 changed files with 3 additions and 1 deletions
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docs/plat/st/stm32mpus.rst
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@ -45,6 +45,8 @@ Serial boot devices:
- ``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 @@ Usually, two copies of fsbl are used (fsbl1 and fsbl2) instead of one partition
--------------
*Copyright (c) 2023, STMicroelectronics - All Rights Reserved*
*Copyright (c) 2023-2024, STMicroelectronics - All Rights Reserved*