diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 8f710d9..eea6317 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -222,6 +222,7 @@ jobs:
               exit 41
           fi
           echo "status=success" >> $GITHUB_OUTPUT
+          echo "FW_VER=$FW_VER" >> $GITHUB_ENV
           echo "G_DEVICE_NAME=$G_DEVICE_NAME" >> $GITHUB_ENV
           echo "G_BOARD_NAME=$G_BOARD_NAME" >> $GITHUB_ENV
           echo "G_SUBTARGET_NAME=$G_SUBTARGET_NAME" >> $GITHUB_ENV
@@ -233,6 +234,79 @@ jobs:
           cat $BUILD_ROOT/.config
           echo "========================"
 
+      - name: Download tools and toolchain
+        id: tools_download
+        if: steps.configure.outputs.status == 'success'
+        run: |
+          cd $BUILD_ROOT
+          G_TARGET_ARCH=$( grep -so '^CONFIG_TARGET_ARCH_PACKAGES=' .config | cut -d'"' -f2 )
+          echo "G_TARGET_ARCH=$G_TARGET_ARCH" >> $GITHUB_ENV
+          echo "OpenWrt version: $FW_VER"
+          SDK_URL_BASE="https://downloads.openwrt.org/releases/${FW_VER}/targets/${G_BOARD_NAME}/${G_SUBTARGET_NAME}"
+          echo "Searching SDK at $SDK_URL_BASE"
+          SDK_TARBALL=$( curl -s "$SDK_URL_BASE/" | grep -oE 'openwrt-sdk-[^"]+Linux-x86_64\.tar\.(xz|zst)' | head -n1 )
+          if [ -z "$SDK_TARBALL" ]; then
+              echo "ERROR: SDK not found for ${G_BOARD_NAME}/${G_SUBTARGET_NAME}"
+              exit 81
+          fi
+          echo "Found SDK: $SDK_TARBALL"
+          #curl -L --fail --retry 5 --retry-delay 5 --progress-bar -o "$SDK_TARBALL" "$SDK_URL_BASE/$SDK_TARBALL"
+          wget --progress=dot:mega "$SDK_URL_BASE/$SDK_TARBALL"
+          if [[ "$SDK_TARBALL" == *.tar.xz ]]; then
+              tar -xf "$SDK_TARBALL"
+          elif [[ "$SDK_TARBALL" == *.tar.zst ]]; then
+              tar -I zstd -xf "$SDK_TARBALL"
+          else
+              echo "Unknown archive format: $SDK_TARBALL"
+              exit 82
+          fi
+          SDK_DIR=$(tar -tf "$SDK_TARBALL" | head -n1 | cut -d/ -f1)
+          echo "Using SDK dir: $SDK_DIR"
+          rm -rf staging_dir
+          mv "$SDK_DIR/staging_dir" .
+          echo "========= staging_dir =========="
+          ls -l staging_dir
+          echo "================================"
+          #cp -a "$SDK_DIR"/toolchain/* toolchain/ 2>/dev/null || true
+          TOOLS_DIR=staging_dir/host
+          touch $TOOLS_DIR/.prepared
+          TOOLS_STAMP_DIR=$TOOLS_DIR/stamp
+          TOOLS_PKGS=$( 
+            find tools/ -maxdepth 1 -mindepth 1 -type d | while read -r d; do
+                mk="$d/Makefile"
+                [ -f "$mk" ] || continue
+                awk -F':=' '
+                  /^[[:space:]]*PKG_NAME[[:space:]]*:=/ {
+                    v=$2
+                    gsub(/\r/, "", v)
+                    gsub(/^[[:space:]]+/, "", v)
+                    gsub(/[[:space:]]+$/, "", v)
+                    if (v != "") print v
+                  }
+                ' "$mk"
+            done | sort -u
+          )
+          mkdir -p "$TOOLS_STAMP_DIR"
+          echo "Found host tools packages: $TOOLS_PKGS"
+          for pkg in $TOOLS_PKGS; do
+              touch "$TOOLS_STAMP_DIR/.$pkg"_installed
+          done
+          TOOLCHAIN_DIR=$( find staging_dir -maxdepth 1 -type d -name "toolchain-*" )
+          echo "Found toolchain directory: $TOOLCHAIN_DIR"
+          #touch $TOOLCHAIN_DIR/.prepared
+          mkdir -p "$TOOLCHAIN_DIR/stamp"
+          touch $TOOLCHAIN_DIR/stamp/.binutils_installed
+          #touch $TOOLCHAIN_DIR/stamp/.fortify-headers_installed
+          touch $TOOLCHAIN_DIR/stamp/.gcc_final_installed
+          touch $TOOLCHAIN_DIR/stamp/.gcc_initial_installed
+          touch $TOOLCHAIN_DIR/stamp/.gdb_installed
+          #touch $TOOLCHAIN_DIR/stamp/.linux_installed
+          touch $TOOLCHAIN_DIR/stamp/.musl_installed
+          touch $TOOLCHAIN_DIR/stamp/.toolchain_compile
+          echo "Checking cross-compiler..."
+          find staging_dir -name '*gcc' | head -n 10
+          echo "status=success" >> $GITHUB_OUTPUT
+
       - name: Build tools and toolchain
         id: tools
         if: steps.configure.outputs.status == 'success'
@@ -240,6 +314,7 @@ jobs:
           cd $BUILD_ROOT
           MAKE_JOBS=$(nproc)
           echo "$MAKE_JOBS thread compile"
+          export CCACHE=1
           make tools/install -j$MAKE_JOBS
           make toolchain/install -j$MAKE_JOBS
           echo "status=success" >> $GITHUB_OUTPUT
@@ -249,11 +324,11 @@ jobs:
         if: steps.tools.outputs.status == 'success'
         env: 
           TARGET: ${{ matrix.target }}
-          FW_VER: ${{ needs.check.outputs.fw_ver }}
         run: |
           cd $BUILD_ROOT
           MAKE_JOBS=$(nproc)
           echo "$MAKE_JOBS thread compile"
+          export CCACHE=1
           if [ "$FAKE_BUILD" != "true" -a "$TEST_BUILD" = "true" -a "$PACKAGE_DIR" != "" ]; then
               make $PACKAGE_DIR/compile V=sc BUILD_LOG=1
               exit 99