Add documentation for STM32MP2

Hardware/MP25EV1.md

@@ -0,0 +1,56 @@
+---
+arm_hardware: true
+cmake_plat: stm32mp2
+xcompiler_arg: -DAARCH64=1
+platform: STM32MP25 EV1
+arch: ARMv8A, AArch64
+virtualization: true
+iommu: false
+soc: STM32MP25
+cpu: Cortex-A35
+verification: [AARCH64]
+Contrib: STMicroelectronics
+Maintained: STMicroelectronics
+parent: /Hardware/
+SPDX-License-Identifier: CC-BY-SA-4.0
+SPDX-FileCopyrightText: 2026 seL4 Project a Series of LF Projects, LLC.
+---
+
+# STM32MP25 EV1
+
+[STM32MP25 evaluation board](https://www.st.com/en/evaluation-tools/stm32mp257f-ev1.html)
+
+{% include hw-info.html %}
+
+## Installation
+
+Instructions to boot the board are available on the [Starter package wiki](https://wiki.st.com/stm32mpu/wiki/STM32MP25_Evaluation_boards_-_Starter_Package#Downloading_the_image_and_flashing_it_on_the_board). These notes describe how to create a raw image to flash a Linux boot on a MicroSD card.
+The flash layout uses ext2 partitions, for seL4 only the `bootfs` partition is used.
+
+### ARM Trusted Firmware (TF-A)
+
+seL4 uses TF-A to start the AT35-TD BL2 U-boot and a secure monitor to serve RIF accesses. The default configuration enables a system watchdog that causes a reset if not rearmed, which might not be long enough for seL4 components.
+
+If necessary, disable the watchdog in `fdts/stm32mp257f-ev1.dts`. Build details are available on the [How to configure TF-A wiki](https://wiki.st.com/stm32mpu/wiki/How_to_configure_TF-A_BL2)
+
+```
+&iwdg1 {
+        timeout-sec = <32>;
+-       status = "okay";
++       status = "disabled";
+ };
+```
+
+## Booting
+
+Identify the partition number and verify the seL4 boot binary you just placed on your microSD card.
+Load and boot the image at `0x88000000`.
+
+```
+STM32MP> mmc part
+...
+STM32MP> ext2ls mmc 0:8
+...
+STM32MP> ext2load mmc 0:8 0x88000000 loader.img
+STM32MP> go 0x88000000
+```