Add STM32H5 architecture documentation.

Documentation/platforms/arm/stm32h5/boards/nucleo-h563zi/index.rst

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+================
+ST Nucleo-H563ZI
+================
+.. figure:: nucleo-h563zi.png
+   :align: center
+
+Board Information
+=================
+
+This page discusses issues unique to NuttX configurations for the
+STMicro NUCLEO-H563ZI development board featuring the STM32H563ZI
+MCU. The STM32H563ZI is a 250MHz Cortex-M33 operation with 2MBytes Flash
+memory and 640KByte SRAM. The board features:
+
+- On-board ST-LINK-V3EC for programming and debugging
+- 3 user LEDs
+- Two pushbuttons (user and reset)
+- 32.768 kHz crystal oscillator
+- USB Type-C connectors
+- Ethernet connector compliant with IEEE-802.3-2002
+- Board connectors:
+  - 2x USB-C
+  - Ethernet RJ45
+  - ST Zio connector including Arduino Uno V3
+  - ST morpho
+
+Refer to the http://www.st.com website for further information about this
+board (search keyword: NUCLEO-H563ZI)
+
+Serial Console
+==============
+
+Many options are available for a serial console via the Morpho connector.
+Here two common serial console options are suggested:
+
+
+1. Nucleo Virtual Console.
+
+   The virtual console uses Serial Port 3 (USART3) with TX on PD8 and RX on
+   PD9.
+
+      ================= ===
+      VCOM Signal       Pin
+      ================= ===
+      SERIAL_RX         PD9
+      SERIAL_TX         PD8
+      ================= ===
+
+   These signals are internally connected to the on board ST-Link.
+
+   The Nucleo virtual console is the default serial console in all
+   configurations unless otherwise stated in the description of the
+   configuration.
+
+2. Arduino Serial Shield.
+
+   If you are using a standard Arduino RS-232 shield with the serial
+   interface with RX on pin D0 and TX on pin D1 from LPUART1:
+
+      ======== ========== =====
+      ARDUINO  FUNCTION   GPIO
+      ======== ========== =====
+      DO RX    LPUART1_RX PB7
+      D1 TX    LPUART1_TX PB6
+      ======== ========== =====
+
+Configurations
+==============
+
+Information Common to All Configurations
+----------------------------------------
+
+Each Nucleo-H563ZI configuration is maintained in a sub-directory and
+can be selected as follows::
+
+    tools/configure.sh [options] nucleo-h563zi:<subdir>
+
+Where options should specify the host build platform (-l for Linux, -c for
+Cygwin under Windows, etc.).  Try 'tools/configure.sh -h' for the complete
+list of options.
+
+Before starting the build, make sure that (1) your PATH environment variable
+includes the correct path to your toolchain, and (2) you have the correct
+toolchain selected in the configuration.
+
+And then build NuttX by simply typing the following.  At the conclusion of
+the make, the nuttx binary will reside in an ELF file called, simply, nuttx.::
+
+    make
+
+The <subdir> that is provided above as an argument to the tools/configure.sh
+must be is one of the following.
+
+NOTES:
+
+1. These configurations use the mconf-based configuration tool.  To
+   change any of these configurations using that tool, you should:
+
+   a. Build and install the kconfig-mconf tool.  See nuttx/README.txt
+      see additional README.txt files in the NuttX tools repository.
+
+   b. Execute 'make menuconfig' in nuttx/ in order to start the
+      reconfiguration process.
+
+2. Unless stated otherwise, all configurations generate console
+   output on the ST-Link VCOM, USART3.
+
+3. Unless otherwise stated, the configurations are setup for Linux by
+   default:
+
+   Build Setup::
+
+     CONFIG_HOST_LINUX=y                     : Linux host operating system
+
+4. All of these configurations use the general arm-none-eabi toolchain for
+   Linux  That toolchain selection can easily be reconfigured using 'make
+   menuconfig'.
+
+5. These configurations all assume that you are loading code using
+   something like the ST-Link v3 JTAG.  None of these configurations are
+   setup to use the DFU bootloader but should be easily reconfigured to
+   use that bootloader if so desired.
+
+Configuration Sub-directories
+=============================
+
+nsh:
+----
+
+This configuration provides a basic NuttShell configuration (NSH)
+for the Nucleo-H563ZI.  The default console is the VCOM on USART3.
+
+adc:
+--------
+
+This configuration configures ADC1_IN3 and ADC1_IN10, which can be
+accessed at the CN9 A0 and A1 pins respectively. Modify
+nucleo-h563zi/src/stm32_adc.c to enable more channels.
+
+usbnsh:
+--------
+
+This configuration provides a basic NuttShell through the USB User interface.
+
+References
+===========
+
+[UM3115] - STM32H5 Nucleo-144 board (MB1404)

Documentation/platforms/arm/stm32h5/index.rst

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+==========
+ST STM32H5
+==========
+
+This is a port of the STM32H5 family.
+The STM32H5 is a chip based on the ARM Cortex-M33.
+Most code is adapted from legacy STM32 and STM32H7.
+
+Development primarily using the Nucleo-H563ZI as of Feb 5th, 2025.
+Therefore, at this time only the STM32H563 is truly supported. However,
+much of the current support should work for all MCUs. Kconfig will need
+updates to support MCUs besides the STM32H563.
+
+Supported MCUs
+==============
+
+===========  ======= ================
+MCU          Support Note
+===========  ======= ================
+STM32H503     No
+STM32H523     No
+STM32H533     No
+STM32H562     No
+STM32H563     Yes
+STM32H573     No
+===========  ======= ================
+
+Peripheral Support
+==================
+
+The following list indicates peripherals supported in NuttX:
+
+==========  =======  =====
+Peripheral  Support  Notes
+==========  =======  =====
+ADC         Yes
+ETH         Yes
+FLASH       Yes      Hardware defines only.
+FDCAN       Yes
+GPIO        Yes
+I2C         Yes
+ICACHE      Yes
+RCC         Yes
+USART       Yes
+LPUART      Yes
+OCTOSPI     Yes      Implemented as QSPI.
+PWR         Yes      Partial.
+SPI         Yes
+TIM         Yes
+USB_FS      Yes      USB Device Support.
+
+AES         No
+CEC         No
+CORDIC      No
+CRC         No
+CRS         No
+DAC         No
+DBG         No
+DCACHE      No
+DCMI        No
+DLYB        No
+DTS         No
+EXTI        No
+FMAC        No
+FSMC        No
+GPDMA       No
+GTZC        No
+HASH        No
+I3C         No
+IWDG        No
+LPTIM       No
+OTFDEC      No
+PKA         No
+PSSI        No
+RAMCFG      No
+SBS         No
+SDMMC       No
+RNG         No
+RTC         No
+SAES        No
+SAI         No
+TAMP        No
+UCPD        No
+VREFBUF     No
+WWDG        No
+
+==========  =======  =====
+
+References
+=================
+[RM0481] Reference Manual: STM32H523/33xx, STM32H562/63xx, and STM32H573xx Arm® -based 32-bit MCUs
+
+Support
+=================
+
+Supported Boards
+================
+
+.. toctree::
+   :glob:
+   :maxdepth: 1
+
+   boards/*/*