Added Odroid XU4 as another supported board

BANANAPI.md → Hardware.md

-# Setup BananaPI for benchmarking
+# Setup Hardware (Banana PI and Drdroid XU4) for benchmarking
 
 
 The goal of this documentation is to get a linux image running on a
 The goal of this documentation is to get a linux image running on a
 bananaPI board that allows for very isolated benchmarks showing full
 bananaPI board that allows for very isolated benchmarks showing full
@@ -6,9 +6,9 @@ time distributions of the measurement runs.
 
 
 ## Base Setup
 ## Base Setup
 
 
-First step is to get a linux image running on the banana PI. We choose to use the
+First step is to get a linux image running on the hardware platforms. We choose to use the
 [armbian](https://www.armbian.com/) project as it is the only one with support for the
 [armbian](https://www.armbian.com/) project as it is the only one with support for the
-bananaPI m3. For this we generally 
+both boards. For this we generally 
 [follow the instructions given](https://docs.armbian.com/Developer-Guide_Build-Preparation/),
 [follow the instructions given](https://docs.armbian.com/Developer-Guide_Build-Preparation/),
 below are notes on what to do to get the rt kernel patch into it and to build.
 below are notes on what to do to get the rt kernel patch into it and to build.
 
 
@@ -23,19 +23,21 @@ General Setup:
 - `$ git clone --depth 1 https://github.com/armbian/build`
 - `$ git clone --depth 1 https://github.com/armbian/build`
 - `$ cd build`
 - `$ cd build`
 - To verify the environment first go for a 'clean build' without patch: `# ./compile.sh` 
 - To verify the environment first go for a 'clean build' without patch: `# ./compile.sh` 
-- Select the bananaPI m3 board and a minimal console build
+- Select the bananaPI m3/odroid xu4 board and a minimal console build
+- NOTE: To this date, the legacy kernel (4.14.y) has to be selected for the odroid xu4 board 
 
 
 Apply RT Pach:
 Apply RT Pach:
 - Find the current kernel version armbian is using, e.g. from the previous build logs
 - Find the current kernel version armbian is using, e.g. from the previous build logs
 - Download and unpack the matching rt path from https://mirrors.edge.kernel.org/pub/linux/kernel/projects/rt/
 - Download and unpack the matching rt path from https://mirrors.edge.kernel.org/pub/linux/kernel/projects/rt/
 - You should have a single .patch file, place it in build/userpatches/kernel/sunix-current/patch-5.4.28-rt19.patch
 - You should have a single .patch file, place it in build/userpatches/kernel/sunix-current/patch-5.4.28-rt19.patch
 - Re-run the `# ./compile.sh` script
 - Re-run the `# ./compile.sh` script
-- Select BananaPI M3, Command Line Minimal and SHOW KERNEL CONFIG
+- Select BananaPI M3/Odroid XU4, Command Line Minimal and SHOW KERNEL CONFIG
 - The build should pick up the patch (and show it in the logs)
 - The build should pick up the patch (and show it in the logs)
 - You will be ask to fill in some settings. Choose (4) fully preemptive at the first option
 - You will be ask to fill in some settings. Choose (4) fully preemptive at the first option
 - Fill out the other asked settings to your liking. To avoid issues just leave them at default.
 - Fill out the other asked settings to your liking. To avoid issues just leave them at default.
 - You will then be in the kernel config window
 - You will then be in the kernel config window
-- Here disable the file systems AUFS and NFS in the settings (they cause build issues and we do not need them)
+    - BananaPI: Here disable the file systems AUFS and NFS in the settings (they cause build issues and we do not need them)
+    - Odroid: Disable Heterogeneous Multi-Processing (HMP) in the settings (does not work with preempt_rt yet)
 - Store the settings and build the image
 - Store the settings and build the image
 - If successfull, the flashed image should show the preempt patch with `uname -a` and should have good latencies in cyclictest
 - If successfull, the flashed image should show the preempt patch with `uname -a` and should have good latencies in cyclictest