Change how the tmpfs volume is mounted in the docker-compose example.

docs/Building.md

@@ -79,6 +79,19 @@ PIC is enabled by default and can be disabled with
 2. Install doxygen and ccache through brew: `brew install doxygen ccache`
 3. Install the GStreamer runtime and developement packages according to [these instructions](https://gstreamer.freedesktop.org/documentation/installing/on-mac-osx.html?gi-language=c#download-and-install-the-sdk)
 
+
+## ARM notes
+
+The MXL project is configured to require the ```armv8.5-a``` architecture on ARM CPUs.  Most modern ARM CPUs meet this requirement.  Notable exceptions are the Raspberry PIs.  For example, the Pi5 CPU has an architecture level ```armv8.2-a``` whereas the Pi4B is at level ```armv8.0-a```.  To properly target these CPUs, pass the architecture type as an additional argument to cmake : ```-DMXL_TARGET_ARCH=<archname>```.
+
+For example, for the Raspberry Pi 5:
+```
+mkdir build
+cd build
+cmake .. --preset Linux-GCC-Debug -DMXL_TARGET_ARCH=armv8.2a
+cmake --build build/Linux-GCC-Debug --target all
+```
+
 # Using with CMake
 
 The MXL provides a CMake package configuration file that allows for easy integration into your project. If it is installed in a non-default location, you may need to specify its root path using `CMAKE_PREFIX_PATH`:

examples/docker-compose.yaml

@@ -1,69 +1,52 @@
-# SPDX-FileCopyrightText: 2025 Contributors to the Media eXchange Layer project.
+# SPDX-FileCopyrightText: 2026 Contributors to the Media eXchange Layer project.
 # SPDX-License-Identifier: Apache-2.0
 
-services:
-  init:
-    image: alpine
-    command: ["sh", "-c", "mkdir -p /dev/shm/mxl"]
-    volumes:
-      - type: bind
-        source: /dev/shm
-        target: /dev/shm
-    restart: no
+volumes:
+  mxl-domain:
+    driver: local
+    driver_opts:
+      type: tmpfs
+      device: tmpfs
+      o: strictatime
 
+services:
   writer-media-function:
     image: mxl-writer
     profiles: [test-source]
-    depends_on:
-      - init
     build:
       context: ..
       dockerfile: examples/Dockerfile.writer.txt
     restart: unless-stopped
     volumes:
-      - type: bind
-        source: /dev/shm/mxl
-        target: /domain
+      - mxl-domain:/domain
 
   writer-looper-video-media-function:
     image: mxl-writer-video-looper
     profiles: [looping-file-source]
-    depends_on:
-      - init
     build:
       context: ..
       dockerfile: examples/Dockerfile.writer.video.loop.txt
     restart: unless-stopped
     volumes:
-      - type: bind
-        source: /dev/shm/mxl
-        target: /domain
+      - mxl-domain:/domain
 
   writer-looper-audio-media-function:
     image: mxl-writer-audio-looper
     profiles: [looping-file-source]
-    depends_on:
-      - init
     build:
       context: ..
       dockerfile: examples/Dockerfile.writer.audio.loop.txt
     restart: unless-stopped
     volumes:
-      - type: bind
-        source: /dev/shm/mxl
-        target: /domain
+      - mxl-domain:/domain
 
   reader-media-function:
     image: mxl-reader
-    depends_on:
-      - init
     build:
       context: ..
       dockerfile: examples/Dockerfile.reader.txt
     restart: unless-stopped
     volumes:
-      - type: bind
-        source: /dev/shm/mxl
-        target: /domain
+      - mxl-domain:/domain
     stdin_open: true
     tty: true