Few minor updates to BuildGuideAndroidNDK.md file

Signed-off-by: Nikhil Raj <nikhil.raj@arm.com>
Change-Id: I380862816cbc7ec509ff01791e77297b859f21ac

2 files changed, 43 insertions, 2 deletions

diff --git a/BuildGuideAndroidNDK.md b/BuildGuideAndroidNDK.md
index e1ec13ec47..70844564a7 100644
--- a/BuildGuideAndroidNDK.md
+++ b/BuildGuideAndroidNDK.md
@@ -48,7 +48,7 @@ All downloaded or generated files will be saved inside the `~/armnn-devenv` dire
 
 * Build:
 
-	(Requires gcc if not previously installed: `sudo apt install gcc`)
+	(Requires clang if not previously installed: `sudo apt-get install clang`)
 	```bash
 	echo "using clang : arm : aarch64-linux-android<Android_API>-clang++ ;" > $HOME/armnn-devenv/boost/user-config.jam
 	cd ~/armnn-devenv/boost/boost_1_64_0
@@ -69,11 +69,22 @@ All downloaded or generated files will be saved inside the `~/armnn-devenv` dire
 	git clone https://github.com/ARM-software/ComputeLibrary.git
 	```
 
+* Checkout ComputeLibrary branch:
+        ```bash
+        cd ComputeLibrary
+        git checkout <branch_name>
+        git pull
+        ```
+        For example, if you want to checkout release branch of 20.02:
+        ```bash
+        git checkout branches/arm_compute_20_02
+        git pull
+        ```
+
 * Build:
 
 	(Requires SCons if not previously installed: `sudo apt install scons`)
 	```bash
-	cd ComputeLibrary
 	scons arch=arm64-v8a neon=1 opencl=1 embed_kernels=1 extra_cxx_flags="-fPIC" \
 	 benchmark_tests=0 validation_tests=0 os=android -j16
 	```
@@ -140,6 +151,20 @@ All downloaded or generated files will be saved inside the `~/armnn-devenv` dire
 	git clone https://github.com/ARM-software/armnn.git
 	```
 
+* Checkout ArmNN branch:
+
+        ```bash
+        cd armnn
+        git checkout <branch_name>
+        git pull
+        ```
+
+        For example, if you want to checkout release branch of 20.02:
+        ```bash
+        git checkout branches/armnn_20_02
+        git pull
+        ```
+
 * Generate TensorFlow protobuf definitions:
 
 	```bash
diff --git a/BuildGuideCrossCompilation.md b/BuildGuideCrossCompilation.md
index 9baf20cb71..156488abca 100644
--- a/BuildGuideCrossCompilation.md
+++ b/BuildGuideCrossCompilation.md
@@ -109,9 +109,17 @@ The instructions show how to build the ArmNN core library and the Boost, Protobu
     ```bash
     git clone https://github.com/ARM-software/ComputeLibrary.git
     cd ComputeLibrary/
+    git checkout <branch_name>
+    git pull
     scons arch=arm64-v8a neon=1 opencl=1 embed_kernels=1 extra_cxx_flags="-fPIC" -j8 internal_only=0
     ```
 
+    For example, if you want to checkout release branch of 20.02:
+        ```bash
+        git checkout branches/arm_compute_20_02
+        git pull
+        ```
+
 #### <a name="buildtf">Build Tensorflow</a>
 * Building Tensorflow version 1.15:
     '''bash
@@ -171,10 +179,18 @@ The instructions show how to build the ArmNN core library and the Boost, Protobu
     ```bash
     git clone https://github.com/ARM-software/armnn.git
     cd armnn
+    git checkout <branch_name>
+    git pull
     mkdir build
     cd build
     ```
 
+    For example, if you want to checkout release branch of 20.02:
+        ```bash
+        git checkout branches/armnn_20_02
+        git pull
+        ```
+
 * Use CMake to configure your build environment, update the following script and run it from the armnn/build directory to set up the armNN build:
     ```bash
     #!/bin/bash