update t440p script

coreboot-t440p/steps/build_bios.sh

@@ -0,0 +1,34 @@
+#!/bin/sh
+# Step: Build coreboot
+
+step_build_bios() {
+  section "Build Coreboot"
+
+  cd "$COREBOOT_DIR" || return 1
+
+  if [ ! -f ".config" ]; then
+    error "No .config found. Run the configure step first."
+    return 1
+  fi
+
+  _nproc=$(nproc 2>/dev/null || echo 1)
+
+  # Build the cross-compiler
+  info "Building cross-compiler toolchain (this will take a while)..."
+  info "Using $_nproc parallel jobs."
+  run_cmd "make crossgcc-i386 CPUS=$_nproc" || return 1
+  success "Cross-compiler ready."
+
+  # Build coreboot
+  echo ""
+  info "Building coreboot..."
+  run_cmd "make -j$_nproc" || return 1
+
+  if [ ! -f "$COREBOOT_DIR/build/coreboot.rom" ]; then
+    error "coreboot.rom not found after build."
+    return 1
+  fi
+
+  _size=$(wc -c < "$COREBOOT_DIR/build/coreboot.rom")
+  success "Build complete: $COREBOOT_DIR/build/coreboot.rom ($_size bytes)"
+}