diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
new file mode 100644
index 0000000..af2ac48
--- /dev/null
+++ b/.github/workflows/build.yml
@@ -0,0 +1,130 @@
+name: ci-build
+
+on:
+  pull_request:
+    branches:
+    - '*'
+  push:
+    branches: [ main, MMU_* ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+
+    # setup base required dependencies
+    - name: Setup dependencies
+      run: |
+          sudo apt-get install cmake ninja-build python3-pyelftools python3-regex python3-polib
+
+    # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+    - name: Checkout ${{ github.event.pull_request.head.ref }}
+      uses: actions/checkout@v3
+      if: ${{ github.event.pull_request }}
+      with:
+        ref: ${{ github.event.pull_request.head.sha }}
+        submodules: true
+
+    - name: Checkout ${{ github.event.ref }}
+      uses: actions/checkout@v3
+      if: ${{ !github.event.pull_request }}
+      with:
+        ref: ${{ github.event.ref }}
+        submodules: true
+
+    - name: Cache Dependencies
+      uses: actions/cache@v3.0.11
+      id: cache-pkgs
+      with:
+          path: ".dependencies"
+          key: "build-deps-1_0_0-linux"
+
+    - name: Setup build dependencies
+      run: |
+          ./utils/bootstrap.py
+
+    - name: Cache permissions
+      run: sudo chmod -R 744 .dependencies
+
+    - name: Build
+      run: |
+          mkdir build
+          cd build
+          cmake .. -DCMAKE_TOOLCHAIN_FILE="../cmake/AvrGcc.cmake" -DCMAKE_BUILD_TYPE=Release -G Ninja
+          ninja
+
+    - name: Upload artifacts
+      if: ${{ !github.event.pull_request }}
+      uses: actions/upload-artifact@v3.1.1
+      with:
+        name: Firmware
+        path: build/*.hex
+
+  tests:
+    runs-on: ubuntu-latest
+
+    permissions:
+      pull-requests: write
+
+    steps:
+
+    # setup base required dependencies
+    - name: Setup dependencies
+      run: |
+          sudo apt-get install gcc-11 g++11 lcov cmake ninja-build python3-pyelftools python3-regex python3-polib
+
+    # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+    - name: Checkout ${{ github.event.pull_request.head.ref }}
+      uses: actions/checkout@v3
+      if: ${{ github.event.pull_request }}
+      with:
+        ref: ${{ github.event.pull_request.head.sha }}
+        submodules: true
+
+    - name: Checkout ${{ github.event.ref }}
+      uses: actions/checkout@v3
+      if: ${{ !github.event.pull_request }}
+      with:
+        ref: ${{ github.event.ref }}
+        submodules: true
+
+    - name: Cache Dependencies
+      uses: actions/cache@v3.0.11
+      id: cache-pkgs
+      with:
+          path: ".dependencies"
+          key: "build-deps-1_0_0-linux"
+
+    - name: Setup build dependencies
+      run: |
+          ./utils/bootstrap.py
+
+    - name: Cache permissions
+      run: sudo chmod -R 744 .dependencies
+
+    - name: Build
+      id: tests_run
+      continue-on-error: true
+      run: |
+          mkdir build
+          cd build
+          cmake .. -G Ninja
+          ninja test_coverage_report
+
+
+    - name: Upload artifacts
+      uses: actions/upload-artifact@v3.1.1
+      with:
+        name: Coverage
+        path: build/Coverage
+
+    - name: Add PR Comment
+      if: ${{ github.event.pull_request }}
+      uses: mshick/add-pr-comment@v2
+      with:
+        message-path: build/Summary.txt
+        message-id: "coverage"
+
+    - name: Report failure
+      if: steps.tests_run.outcome == 'failure'
+      run: echo ${{ steps.tests_run.outcome  }} && test -n ""
diff --git a/.github/workflows/pr-size.yml b/.github/workflows/pr-size.yml
index ac7075b..e90d76e 100644
--- a/.github/workflows/pr-size.yml
+++ b/.github/workflows/pr-size.yml
@@ -24,10 +24,20 @@ jobs:
     - name: Checkout base
       uses: actions/checkout@v3
 
+    - name: Cache Dependencies
+      uses: actions/cache@v3.0.11
+      id: cache-pkgs
+      with:
+          path: ".dependencies"
+          key: "build-deps-1_0_0-linux"
+
     - name: Setup build dependencies
       run: |
           ./utils/bootstrap.py
 
+    - name: Cache permissions
+      run: sudo chmod -R 744 .dependencies
+
     - name: Build base
       run: |
           rm -rf build-base
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index e66dc79..d7b291e 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -15,7 +15,7 @@ if(GCOV_ENABLE)
     COMMAND ${CMAKE_COMMAND} -E remove ${PROJECT_BINARY_DIR}/.ctest-finished
     )
 
-  set(ctest_test_args --timeout 30 --output-on-failure)
+  set(ctest_test_args --timeout 180 --output-on-failure)
 
   include(ProcessorCount)
   ProcessorCount(N)
@@ -55,7 +55,8 @@ if(GCOV_ENABLE)
     COMMAND tar -zcvf Coverage.tar.gz Coverage
             # Cheat and compare a file to itself to check for existence. File-Not-Found is a failure
             # code.
-    COMMAND ../../utils/gcovr.py -r . -e '../../tests' -e '../../lib/Catch2' | tee Summary.txt
+    COMMAND ${PROJECT_SOURCE_DIR}/utils/gcovr.py -r ${CMAKE_SOURCE_DIR} -e 'tests' -e 'lib/Catch2' |
+            tee Summary.txt
     COMMAND ${CMAKE_COMMAND} -E compare_files ${PROJECT_BINARY_DIR}/.ctest-finished
             ${PROJECT_BINARY_DIR}/.ctest-finished
     BYPRODUCTS ${PROJECT_BINARY_DIR}/Summary.txt ${PROJECT_BINARY_DIR}/Coverage.tar.gz
diff --git a/utils/gcovr.py b/utils/gcovr.py
index febd0fe..725b0f1 100755
--- a/utils/gcovr.py
+++ b/utils/gcovr.py
@@ -619,6 +619,10 @@ def process_gcov_data(data_fname, covdata, source_fname, options):
         is_code_statement = False
         if tmp[0] == '-' or (excluding and tmp[0] in "#=0123456789"):
             is_code_statement = True
+            if len(segments) < 3:
+                noncode.add(lineno)
+                continue
+                
             code = segments[2].strip()
             # remember certain non-executed lines
             if excluding or is_non_code(segments[2]):
@@ -634,7 +638,7 @@ def process_gcov_data(data_fname, covdata, source_fname, options):
             uncovered_exceptional.add(lineno)
         elif tmp[0] in "0123456789":
             is_code_statement = True
-            covered[lineno] = int(segments[0].strip())
+            covered[lineno] = int(segments[0].strip().rstrip('*'))
         elif tmp.startswith('branch'):
             exclude_branch = False
             if options.exclude_unreachable_branches and \