diff --git a/.github/actions/do_build_ock/action.yml b/.github/actions/do_build_ock/action.yml
index 6b5a217b69..0feebbaff1 100644
--- a/.github/actions/do_build_ock/action.yml
+++ b/.github/actions/do_build_ock/action.yml
@@ -109,6 +109,9 @@ inputs:
   cxx_compiler:
     description: "C++ compiler (default g++)"
     default: "g++"
+  toolchain_file:
+    description: "Path to toolchain file"
+    default: ""
 
 runs:
   # We don't want a new docker just a list of steps, so mark as composite
@@ -166,6 +169,7 @@ runs:
               -DCA_BUILD_32_BITS=${{ inputs.build_32_bit }}
               -DCMAKE_C_COMPILER=${{ inputs.c_compiler }}
               -DCMAKE_CXX_COMPILER=${{ inputs.cxx_compiler }}
+              -DCMAKE_TOOLCHAIN_FILE=${{ inputs.toolchain_file }}
                ${{ inputs.extra_flags }}
                .
     - name: build_ock
diff --git a/.github/actions/setup_build/action.yml b/.github/actions/setup_build/action.yml
index 87afbdbe10..5f0d060bd2 100644
--- a/.github/actions/setup_build/action.yml
+++ b/.github/actions/setup_build/action.yml
@@ -42,7 +42,15 @@ runs:
         sudo apt-get install --yes doxygen
         sudo apt-get install --yes vulkan-sdk
         if [ "${{ inputs.arch }}" = "x86" ]; then sudo apt-get install --yes gcc-multilib g++-multilib libc6-dev:i386 lib32tinfo-dev ; fi
-
+        # aarch64: Enable ability to install arm64 packages for cross compilation
+        #      The main archive only hosts amd64 and i386, also add ports for arm64.
+        #      Also install Arm/Aarch64 requirements
+        if [ "${{ inputs.arch }}" = "aarch64" ]; then \
+          #  sudo dpkg --add-architecture arm64 ; \
+           sudo apt-get install --yes gcc-11-arm-linux-gnueabihf g++-11-arm-linux-gnueabihf; \
+           sudo apt-get install --yes gcc-11-aarch64-linux-gnu g++-11-aarch64-linux-gnu; \
+        fi
+          #  sudo sed -i -e '/^deb /{h;s|deb |&[arch=amd64,i386] |p;g;s|deb http://[^ ]*|deb [arch=arm64] http://ports.ubuntu.com/ubuntu-ports|p;d}' /etc/apt/sources.list; \
     - name: Install windows prerequisites
       if: ${{ inputs.os == 'windows' }}
       shell: pwsh
diff --git a/.github/workflows/planned_testing.yml b/.github/workflows/planned_testing.yml
index f90d57a19e..e5d9f4b57a 100644
--- a/.github/workflows/planned_testing.yml
+++ b/.github/workflows/planned_testing.yml
@@ -15,6 +15,10 @@ on:
         required: false
         type: string
         default: '["ubuntu-22.04", "windows-2019"]'
+      update_cache:
+        required: false
+        type: boolean
+        default: false        
       # target_host_x86_64_windows:
       #   required: false
       #   type: boolean
@@ -29,7 +33,7 @@ on:
         default: 18
 
 env:
-  target_list: '["x64","aarch64", "riscv64"]'
+  target_list: '["x86_64","aarch64", "riscv64"]'
   os_list: '["ubuntu-22.04", "windows-2019"]'
 
 jobs:
@@ -41,30 +45,119 @@ jobs:
         target_list: ${{ steps.step1.outputs.target_list }}
         os_list: ${{ steps.step1.outputs.os_list }}
     steps:
-      - uses: actions/checkout@v3
       - id: step1
         run: |
-          echo "target_list=$target_list" >> "$GITHUB_OUTPUT"
-          echo "os_list=$os_list" >> "$GITHUB_OUTPUT"        
-          # echo "target_list=${{ inputs.target_list }}" >> "$GITHUB_OUTPUT"
-          # echo "os_list=${{ inputs.os_list }}" >> "$GITHUB_OUTPUT"
+          # echo "target_list=$target_list" >> "$GITHUB_OUTPUT"
+          # echo "os_list=$os_list" >> "$GITHUB_OUTPUT"        
+          echo 'target_list=${{ inputs.target_list }}' >> "$GITHUB_OUTPUT"
+          echo 'os_list=${{ inputs.os_list }}' >> "$GITHUB_OUTPUT"
           cat $GITHUB_OUTPUT
 
   create_ock_artefacts:
     needs: calc_matrix  
     strategy:
       matrix:
-        arch: ${{ fromJson(needs.calc_matrix.outputs.target_list) }}
+        target: ${{ fromJson(needs.calc_matrix.outputs.target_list) }}
         os: ${{ fromJson(needs.calc_matrix.outputs.os_list) }}      
         build_type: [RelAssert]
+        exclude:
+          - os: windows-2019
+          - target: riscv64
+          # - target: aarch64
+
+    runs-on: ${{ matrix.os }}
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v4
+
+      # TODO: Move this to a single action
+      - name: load native llvm
+        if: ${{ matrix.target }} != "x86_64" && ${{ matrix.os }} == "ubuntu-22.04"
+        uses: actions/cache/restore@v4
+        with:
+          path: llvm_install/**
+          key: llvm-ubuntu-22.04-x86_64-v19-RelAssert
+          fail-on-cache-miss: true
+      - name: mv llvm native
+        if: ${{ matrix.target }} != "x86_64" && ${{ matrix.os }} == "ubuntu-22.04"
+        run: mv llvm_install llvm_install_native
+
+      # installs tools, ninja, installs llvm and sets up sccache
+      - name: setup-ubuntu
+        if: ${{ matrix.target }} == "x86_64" && ${{ matrix.os }} == "ubuntu-22.04"
+        uses:  ./.github/actions/setup_build
+        with:
+          llvm_version: 19
+          llvm_build_type: RelAssert
+          # For now target and arch match
+          arch: ${{ matrix.target }}
+          save:  ${{ inputs.update_cache }}
+          toolchain_file: scripts/../platform/arm-linux/${{ matrix.target }}-toolchain.cmake"
+
+      - name: build ock x86
+        if: ${{ matrix.target  == 'x86_64' &&  matrix.os == 'ubuntu-22.04' }}
+        # if: ${{ matrix.target }} == "x86_64" && ${{ matrix.os }} == "ubuntu-22.04"
+        uses: ./.github/actions/do_build_ock
+        with:
+          build_target: install
+
+      - name: build ock other ${{ matrix.target }}
+        if: ${{ matrix.target  != 'x86_64' &&  matrix.os == 'ubuntu-22.04' }}
+        uses: ./.github/actions/do_build_ock
+        with:
+          build_target: install
+          # Todo : target does not directly equate to arch here
+          arch: ${{ matrix.target }}
+          toolchain_file: "platform/arm-linux/aarch64-toolchain.cmake"
+          extra_flags: -DCA_BUILTINS_TOOLS_DIR=${{ github.workspace }}/llvm_install_native/bin
+          host_fp16: ON
 
+      - name: upload ock artefact
+        if: ${{ matrix.target }} == "x86_64" && ${{ matrix.os }} == "ubuntu-22.04"
+        uses: actions/upload-artifact@v4
+        with:
+          name: ock_${{matrix.os}}_${{matrix.target}}
+          path: install
+          retention-days: 1
+
+
+  # use_ock_artefacts_all:
+  #   needs: [ calc_matrix, create_ock_artefacts ]
+  #   strategy:
+  #     matrix:
+  #       target: ${{ fromJson(needs.calc_matrix.outputs.target_list) }}
+  #       os: ${{ fromJson(needs.calc_matrix.outputs.os_list) }}      
+  #       build_type: [RelAssert]
+  #       exclude:
+  #         - os: windows-2019
+  #           target: aarch64
+  #         - os: windows-2019
+  #           target: riscv64
+
+
+  use_ock_artefacts_ubuntu_x86_aarch64:
+    needs: [ calc_matrix, create_ock_artefacts ]
+    strategy:
+      matrix:
+        target: ${{ fromJson(needs.calc_matrix.outputs.target_list) }}
+        os: ${{ fromJson(needs.calc_matrix.outputs.os_list) }}      
+        build_type: [RelAssert]
+        exclude:
+          - os: windows-2019
+          - target: riscv64
+          - target: aarch64
     runs-on: ${{ matrix.os }}
     steps:
-      - name: Build ock (pretend)
-        # if: ${{ contains(inputs.target_linux.matrix.arch,  matrix.arch) }}
-        run:
-          echo Running for ${{ matrix.arch }} on os ${{ matrix.os}} input is ${{ inputs.target_linux }})
+      - name: Download ock artefact
+        if: ${{ matrix.os }} == "x86_64"
+        uses: actions/download-artifact@v4
+        with:
+          name: ock_${{matrix.os}}_${{matrix.target}}
 
+      - name: print ock artefact
+        if: ${{ matrix.os }} == "x86_64"
+        run: |
+          ls -R .
         # echo "${{ matrix.os }} ${{ matrix.build_type }} ${{ matrix.arch }}" > foo.txt
         
         # --define CA_CL_ENABLE_ICD_LOADER=ON
diff --git a/.github/workflows/planned_testing_caller.yml b/.github/workflows/planned_testing_caller.yml
index 844cda43aa..0085f70395 100644
--- a/.github/workflows/planned_testing_caller.yml
+++ b/.github/workflows/planned_testing_caller.yml
@@ -10,12 +10,16 @@ on:
 
 jobs:
   run-with-pull:
-    name: Call PR testing on pull request
+    name: _
     if: ${{ github.event_name == 'pull_request' }}    
     uses: ./.github/workflows/planned_testing.yml
     with:
-      target_list: '["x86_64"]'
+      # target_list: '["x86_64", "aarch64", "riscv64"]'
+      target_list: '["aarch64"]'
+      # os_list: '["ubuntu-22.04", "windows-2019"]'
+      # target_list: '["x86_64"]'
       os_list: '["ubuntu-22.04"]'
+      # os_list: '["ubuntu-22.04"]'
       # target_host_aarch64_linux: true
 
   # # Could have multiple here
diff --git a/.github/workflows/run_pr_tests_caller.yml b/.github/workflows/run_pr_tests_caller.yml
index a40a2951f9..7ae5214ba6 100644
--- a/.github/workflows/run_pr_tests_caller.yml
+++ b/.github/workflows/run_pr_tests_caller.yml
@@ -18,19 +18,19 @@ on:
     - cron: '00 19 * * 1-5'
 
 jobs:
-  run-with-pull:
-    name: Call PR testing on pull request
-    if: ${{ github.event_name == 'pull_request' }}    
-    uses: ./.github/workflows/run_pr_tests.yml
-    with:
-      update_cache: false
+  # run-with-pull:
+  #   name: Call PR testing on pull request
+  #   if: ${{ github.event_name == 'pull_request' }}    
+  #   uses: ./.github/workflows/run_pr_tests.yml
+  #   with:
+  #     update_cache: false
 
-  # Could have multiple here
-  run-with-cron:
-    name: Call PR testing on schedule
-    if: ${{ github.event_name == 'schedule' }}    
-    uses: ./.github/workflows/run_pr_tests.yml
-    with:
-      update_cache: true
+  # # Could have multiple here
+  # run-with-cron:
+  #   name: Call PR testing on schedule
+  #   if: ${{ github.event_name == 'schedule' }}    
+  #   uses: ./.github/workflows/run_pr_tests.yml
+  #   with:
+  #     update_cache: true
 
 # additional ones here for cron and/or push to main - also can be in different file.