diff --git a/.github/workflows/test_size.yml b/.github/workflows/test_size.yml
deleted file mode 100644
index 09db01cfd1..0000000000
--- a/.github/workflows/test_size.yml
+++ /dev/null
@@ -1,180 +0,0 @@
-name: test size
-
-on: [push, pull_request, workflow_dispatch]
-# paths:
-# - "*"
-# - "!README.md" <-- don't rebuild on doc change
-concurrency:
-  group: ci-${{github.workflow}}-${{ github.ref }}
-  cancel-in-progress: true
-
-jobs:
-  build:
-    runs-on: ubuntu-20.04
-    container: ardupilot/ardupilot-dev-chibios:latest
-    strategy:
-      fail-fast: false  # don't cancel if a job from the matrix fails
-      matrix:
-        toolchain: [
-            base,  # GCC
-        ]
-        config: [
-            Durandal,
-            MatekF405,
-            Pixhawk1-1M,
-            Hitec-Airspeed,  # see special code for Periph below (3 places!)
-            f103-GPS  # see special code for Periph below (3 places!)
-        ]
-    steps:
-      - uses: actions/checkout@v2
-        with:
-          ref: 'master'
-          path: 'master'
-          submodules: 'recursive'
-      # Put ccache into github cache for faster build
-      - name: Prepare ccache timestamp
-        id: ccache_cache_timestamp
-        run: |
-          NOW=$(date -u +"%F-%T")
-          echo "::set-output name=timestamp::${NOW}"
-      - name: ccache cache files
-        uses: actions/cache@v2
-        with:
-          path: ~/.ccache
-          key: ${{github.workflow}}-ccache-${{ matrix.toolchain }}-${{steps.ccache_cache_timestamp.outputs.timestamp}}
-          restore-keys: ${{github.workflow}}-ccache-${{ matrix.toolchain }}-  # restore ccache from either previous build on this branch or on master
-      - name: setup ccache
-        run: |
-          mkdir -p ~/.ccache
-          echo "base_dir = ${GITHUB_WORKSPACE}" > ~/.ccache/ccache.conf
-          echo "compression = true" >> ~/.ccache/ccache.conf
-          echo "compression_level = 6" >> ~/.ccache/ccache.conf
-          echo "max_size = 400M" >> ~/.ccache/ccache.conf
-          ccache -s
-          ccache -z
-
-      - name: Build master ${{matrix.config}} ${{ matrix.toolchain }}
-        env:
-          CI_BUILD_TARGET: ${{matrix.config}}
-        shell: bash
-        run: |
-          PATH="/github/home/.local/bin:$PATH"
-          cd master
-          ./waf configure --board ${{matrix.config}}
-          if [ "${{matrix.config}}" = "Hitec-Airspeed" ] ||
-             [ "${{matrix.config}}" = "f103-GPS" ]; then
-            ./waf AP_Periph
-          else
-            ./waf
-          fi
-          mkdir -p $GITHUB_WORKSPACE/master_bin
-          cp -r build/${{matrix.config}}/bin/* $GITHUB_WORKSPACE/master_bin/
-
-          # build a set of binaries without symbols so we can check if
-          #  the binaries have changed.
-          echo [`date`] Building master with no versions
-
-          NO_VERSIONS_DIR="$GITHUB_WORKSPACE/master_bin_no_versions"
-          mkdir "$NO_VERSIONS_DIR"
-
-          if [ "${{matrix.config}}" = "Hitec-Airspeed" ] ||
-             [ "${{matrix.config}}" = "f103-GPS" ]; then
-            CHIBIOS_GIT_VERSION="12345678" GIT_VERSION="abcdef" ./waf AP_Periph
-          else
-            CHIBIOS_GIT_VERSION="12345678" GIT_VERSION="abcdef" ./waf
-          fi
-          cp -r build/${{matrix.config}}/bin/* "$NO_VERSIONS_DIR"
-
-          echo [`date`] Built master with no versions
-
-      - uses: actions/checkout@v2
-        with:
-          fetch-depth: 0
-          path: 'pr'
-
-      - name: Build PR rebased ${{matrix.config}} ${{ matrix.toolchain }}
-        env:
-          CI_BUILD_TARGET: ${{matrix.config}}
-        shell: bash
-        run: |
-          PATH="/github/home/.local/bin:$PATH"
-          cd pr/
-          git config user.email "ardupilot-ci@ardupilot.org"
-          git config user.name "ArduPilot CI"
-          git remote add ardupilot https://github.com/ArduPilot/ardupilot.git
-          git fetch --no-tags --prune --progress ardupilot master
-          git rebase ardupilot/master
-          git submodule update --init --recursive --depth=1
-          ./waf configure --board ${{matrix.config}}
-          if [ "${{matrix.config}}" = "Hitec-Airspeed" ] ||
-             [ "${{matrix.config}}" = "f103-GPS" ]; then
-            ./waf AP_Periph
-          else
-            ./waf
-          fi
-          mkdir $GITHUB_WORKSPACE/pr_bin
-          cp -r build/${{matrix.config}}/bin/* $GITHUB_WORKSPACE/pr_bin/
-
-          # build a set of binaries without symbols so we can check if
-          #  the binaries have changed.
-          echo [`date`] Building PR with no versions
-
-          NO_VERSIONS_DIR="$GITHUB_WORKSPACE/pr_bin_no_versions"
-          mkdir "$NO_VERSIONS_DIR"
-
-          if [ "${{matrix.config}}" = "Hitec-Airspeed" ] ||
-             [ "${{matrix.config}}" = "f103-GPS" ]; then
-            CHIBIOS_GIT_VERSION="12345678" GIT_VERSION="abcdef" ./waf AP_Periph
-          else
-            CHIBIOS_GIT_VERSION="12345678" GIT_VERSION="abcdef" ./waf
-          fi
-          cp -r build/${{matrix.config}}/bin/* "$NO_VERSIONS_DIR"
-
-          echo [`date`] Built PR with no versions
-
-          # build MatekF405 Plane without quadplane
-          if [ "${{matrix.config}}" = "MatekF405" ]; then
-            PLANE_BINARY="build/MatekF405/bin/arduplane.bin"
-            echo "normal size"
-            ls -l "$PLANE_BINARY"
-            EXTRA_HWDEF="/tmp/extra-options.def"
-            echo "define HAL_QUADPLANE_ENABLED 0" >"$EXTRA_HWDEF"
-            ./waf configure --board ${{matrix.config}} --extra-hwdef="$EXTRA_HWDEF"
-            ./waf plane
-            rm "$EXTRA_HWDEF"
-            echo "non-quadplane size:"
-            ls -l "$PLANE_BINARY"
-          fi
-
-      - name: Full size compare with Master
-        shell: bash
-        run: |
-          cd pr/
-          python3 -m pip install -U tabulate
-          Tools/scripts/pretty_diff_size.py -m $GITHUB_WORKSPACE/master_bin -s $GITHUB_WORKSPACE/pr_bin
-
-      - name: Checksum compare with Master
-        shell: bash
-        run: |
-          diff -r $GITHUB_WORKSPACE/master_bin_no_versions $GITHUB_WORKSPACE/pr_bin_no_versions --exclude=*.elf --exclude=*.apj || true
-
-      - name: elf_diff compare with Master
-        shell: bash
-        run: |
-          python3 -m pip install -U weasyprint elf_diff anytree
-          mkdir elf_diff
-          if [ "${{matrix.config}}" = "Hitec-Airspeed" ] ||
-             [ "${{matrix.config}}" = "f103-GPS" ]; then
-             python3 -m elf_diff --bin_prefix=arm-none-eabi- --html_dir=elf_diff/AP_Periph $GITHUB_WORKSPACE/master_bin/AP_Periph $GITHUB_WORKSPACE/pr_bin/AP_Periph
-          else
-             python3 -m elf_diff --bin_prefix=arm-none-eabi- --html_dir=elf_diff/plane $GITHUB_WORKSPACE/master_bin/arduplane $GITHUB_WORKSPACE/pr_bin/arduplane
-             python3 -m elf_diff --bin_prefix=arm-none-eabi- --html_dir=elf_diff/copter $GITHUB_WORKSPACE/master_bin/arducopter $GITHUB_WORKSPACE/pr_bin/arducopter
-          fi
-          zip -r elf_diff.zip elf_diff
-
-      - name: Archive elf_diff output
-        uses: actions/upload-artifact@v2
-        with:
-           name: ELF_DIFF_${{matrix.config}}
-           path: elf_diff.zip
-           retention-days: 14