[PATCH] Updated stm32h7 docs

[Robin.Mueller]

More informaion on where to find adaption points to different
board variations and also instructions on how to configure
the BSP build for a certain board variation
---
 user/bsps/arm/stm32h7.rst | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/user/bsps/arm/stm32h7.rst b/user/bsps/arm/stm32h7.rst
index 3eee511..a373e70 100644
--- a/user/bsps/arm/stm32h7.rst
+++ b/user/bsps/arm/stm32h7.rst
@@ -11,16 +11,25 @@ This BSP supports the
 The BSP is known to run on these boards:
 
 * `STM32H743I-EVAL 2 <https://www.st.com/en/evaluation-tools/stm32h743i-eval.html>`_
+* `STM32H743ZI-Nucleo <https://www.st.com/en/evaluation-tools/nucleo-h743zi.html>`_
 
 Clock Driver
 ------------
 
-The clock driver uses the `ARMv7-M Systick` module.
+The clock driver uses the `ARMv7-M Systick` module. The HSE (external oscillator) value can also be different for different evaluation or custom boards, so it is recommended to check the default values of the BSP.
 
 Console Driver
 --------------
 
 The console driver supports the on-chip UART and USART modules.
+Different board variations use different GPIO pins and blocks for the default communication UART and it is recommended to check whetheer the default configuration provided is valid in the BSP.
+
+To specify that the BSP should be built for the STM32H743ZI-Nucleo board,
+users can supply ``STM32H743ZI_NUCLEO == True`` to ``config.ini`` when building the
+BSP.
+
+Alternatively, users can supply the configuration structs defined in ``hal.h``
+in the applicaton for other boards. For the console driver, the ``stm32h7_usartX_config`` structs are used to configure the GPIO pins and other parameters. The default implementations can be found in ``bsps/arm/stm32ht/console`` in the RTEMS sources.
 
 Network Interface Driver
 ------------------------
-- 
2.25.1