update t440p script

coreboot-t440p/steps/build_peppy.sh

@@ -0,0 +1,42 @@
+#!/bin/sh
+# Step: Download peppy ChromeOS image and extract mrc.bin
+
+step_build_peppy() {
+  section "Obtain mrc.bin"
+
+  info "mrc.bin is a memory reference code blob needed for Haswell platforms."
+  info "It will be extracted from a ChromeOS peppy firmware image."
+  echo ""
+
+  cd "$COREBOOT_DIR/util/chromeos" || return 1
+
+  # Download peppy firmware
+  info "Downloading peppy ChromeOS firmware image (this may take a while)..."
+  run_cmd "./crosfirmware.sh peppy" || return 1
+
+  # Find the downloaded image
+  _peppy_image=$(ls coreboot-*.bin 2>/dev/null | head -1)
+  if [ -z "$_peppy_image" ]; then
+    error "Peppy firmware image not found after download."
+    return 1
+  fi
+  info "Downloaded: $_peppy_image"
+
+  # Extract mrc.bin using cbfstool
+  info "Extracting mrc.bin..."
+  run_cmd "../cbfstool/cbfstool $_peppy_image extract -f mrc.bin -n mrc.bin -r RO_SECTION" || return 1
+
+  if [ ! -f "mrc.bin" ]; then
+    error "mrc.bin not found after extraction."
+    return 1
+  fi
+
+  mv mrc.bin "$BLOB_MRC"
+  success "mrc.bin extracted to $BLOB_MRC"
+
+  # Clean up the large peppy image
+  if prompt_yes_default "Remove peppy firmware image to save space?"; then
+    rm -f coreboot-*.bin
+    info "Cleaned up peppy firmware image."
+  fi
+}