diff --git a/.github/workflows/build-images.yaml b/.github/workflows/build-images.yaml
index 2934ebe..51f3a12 100644
--- a/.github/workflows/build-images.yaml
+++ b/.github/workflows/build-images.yaml
@@ -35,6 +35,17 @@ jobs:
           echo "PLATFORM=$PLATFORM"
           echo "ROS_DISTRO=$ROS_DISTRO"
 
+      # ── Stage 0: Download Buildroot SDK ────────────────────────────────
+      - name: Download Buildroot SDK
+        env:
+          GITEA_TOKEN: ${{ secrets.GITEA_TOKEN }}
+        run: |
+          mkdir -p cross_compile/${PLATFORM}
+          SDK_URL="https://gitea.himicat.top/api/packages/xixing-tech/generic/${PLATFORM}-buildroot-sdk/1.0.0/aarch64-buildroot-linux-gnu_sdk-buildroot.tar.gz"
+          curl --fail -u "EricXZ:${GITEA_TOKEN}" \
+            -L -o cross_compile/${PLATFORM}/sdk.tar.gz \
+            "$SDK_URL"
+
       # ── Stage 1: cc-base ─────────────────────────────────────────────
       - name: Build cc-base
         run: docker compose -f cross_compile/compose.yaml build cc-base