samples: openamp: add support for stm32h747i_disco board

This add openamp sample run on stm32h747i_disco board.

The CM7 on stm32h747 support memory cache. If the cache enabled on CM7,
CM4 will receive incorrect data. This just disable the memory cache
on CM7, future user may want to use more flexible way to fix it.

Signed-off-by: HaiLong Yang <cameledyang@pm.me>

Author: cameled

samples/subsys/ipc/openamp/CMakeLists.txt

@@ -16,6 +16,8 @@ elseif("${BOARD}" STREQUAL "mps2_an521")
   set(BOARD_REMOTE "mps2_an521_remote")
 elseif("${BOARD}" STREQUAL "v2m_musca_b1")
   set(BOARD_REMOTE "v2m_musca_b1_ns")
+elseif("${BOARD}" STREQUAL "stm32h747i_disco_m7")
+  set(BOARD_REMOTE "stm32h747i_disco_m4")
 else()
   message(FATAL_ERROR "${BOARD} was not supported for this sample")
 endif()

samples/subsys/ipc/openamp/README.rst

@@ -10,6 +10,10 @@ This application demonstrates how to use OpenAMP with Zephyr. It is designed to
 demonstrate how to integrate OpenAMP with Zephyr both from a build perspective
 and code.
 
+This application contains an extra remote core project. Master core builds
+process will compile the remote too. Remote core builds directory located in
+``build/openamp_remote-prefix/src/openamp_remote-build``.
+
 Building the application for lpcxpresso54114_m4
 ***********************************************
 
@@ -42,6 +46,19 @@ Building the application for v2m_musca_b1
    :board: v2m_musca_b1
    :goals: debug
 
+Building the application for stm32h747i_disco_m7
+************************************************
+Build process will compile the stm32h747i_disco_m4 remote project too.
+
+.. code-block:: console
+
+   # From the root of the zephyr repository
+   west build -b stm32h747i_disco_m7 samples/subsys/ipc/openamp
+   # Flash stm32h747i_disco_m7 application
+   west flash
+   # Flash stm32h747i_disco_m4 application
+   west flash --build-dir build/openamp_remote-prefix/src/openamp_remote-build
+
 Open a serial terminal (minicom, putty, etc.) and connect the board with the
 following settings:
 

samples/subsys/ipc/openamp/boards/stm32h747i_disco_m7.conf

@@ -0,0 +1,3 @@
+CONFIG_IPM_STM32_HSEM=y
+# Disable the memory cache, write to memory directly.
+CONFIG_NOCACHE_MEMORY=y

samples/subsys/ipc/openamp/boards/stm32h747i_disco_m7.overlay

@@ -0,0 +1,17 @@
+/*
+ * Copyright (c) 2021 BrainCo Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	chosen {
+		/* Shared memory reserved for the inter-processor communication */
+		zephyr,ipc_shm = &sram4;
+		zephyr,ipc = &mailbox;
+	};
+};
+
+&mailbox {
+    status = "okay";
+};

samples/subsys/ipc/openamp/remote/CMakeLists.txt

@@ -8,7 +8,8 @@ cmake_minimum_required(VERSION 3.20.0)
 if(("${BOARD}" STREQUAL "lpcxpresso54114_m0")
 	OR "${BOARD}" STREQUAL "lpcxpresso55s69_cpu1"
 	OR "${BOARD}" STREQUAL "mps2_an521_remote"
-	OR "${BOARD}" STREQUAL "v2m_musca_b1_ns")
+	OR "${BOARD}" STREQUAL "v2m_musca_b1_ns"
+	OR "${BOARD}" STREQUAL "stm32h747i_disco_m4")
 	message(STATUS "${BOARD} compiles as remote in this sample")
 else()
 	message(FATAL_ERROR "${BOARD} was not supported for this sample")

samples/subsys/ipc/openamp/remote/boards/stm32h747i_disco_m4.conf

@@ -0,0 +1 @@
+CONFIG_IPM_STM32_HSEM=y

samples/subsys/ipc/openamp/remote/src/main.c

@@ -78,6 +78,8 @@ static void virtio_notify(struct virtqueue *vq)
 	uint32_t current_core = sse_200_platform_get_cpu_id();
 
 	ipm_send(ipm_handle, 0, current_core ? 0 : 1, 0, 1);
+#elif defined(CONFIG_IPM_STM32_HSEM)
+	ipm_send(ipm_handle, 0, 0, NULL, 0);
 #else
 	uint32_t dummy_data = 0x00110011; /* Some data must be provided */
 

samples/subsys/ipc/openamp/sample.yaml

@@ -4,7 +4,7 @@ sample:
     name: OpenAMP example integration
 tests:
     sample.ipc.openamp:
-        platform_allow: lpcxpresso54114_m4 lpcxpresso55s69_cpu0 mps2_an521 v2m_musca_b1
+        platform_allow: lpcxpresso54114_m4 lpcxpresso55s69_cpu0 mps2_an521 v2m_musca_b1 stm32h747i_disco_m7
         tags: ipm
         harness: console
         harness_config:

samples/subsys/ipc/openamp/src/main.c

@@ -89,6 +89,8 @@ static void virtio_notify(struct virtqueue *vq)
 	uint32_t current_core = sse_200_platform_get_cpu_id();
 
 	ipm_send(ipm_handle, 0, current_core ? 0 : 1, 0, 1);
+#elif defined(CONFIG_IPM_STM32_HSEM)
+	ipm_send(ipm_handle, 0, 0, NULL, 0);
 #else
 	uint32_t dummy_data = 0x55005500; /* Some data must be provided */