update t440p script

coreboot-t440p/steps/flash_bios.sh

@@ -0,0 +1,58 @@
+#!/bin/sh
+# Step: Flash coreboot to the T440p
+
+step_flash_bios() {
+  section "Flash Coreboot"
+
+  cd "$COREBOOT_DIR/build" || return 1
+
+  if [ ! -f "coreboot.rom" ]; then
+    error "coreboot.rom not found. Run the build step first."
+    return 1
+  fi
+
+  # Split the ROM
+  info "Splitting ROM for 8MB (bottom) and 4MB (top) chips..."
+  run_cmd "dd if=coreboot.rom of=bottom.rom bs=1M count=8" || return 1
+  run_cmd "dd if=coreboot.rom of=top.rom bs=1M skip=8" || return 1
+
+  _bottom_size=$(wc -c < bottom.rom)
+  _top_size=$(wc -c < top.rom)
+  info "bottom.rom: $_bottom_size bytes"
+  info "top.rom: $_top_size bytes"
+
+  echo ""
+  warn "You are about to flash coreboot onto your T440p."
+  warn "Make sure your laptop is powered off and the battery is removed."
+  warn "DO NOT interrupt the flashing process!"
+  echo ""
+
+  if ! prompt_yes_no "Ready to flash?"; then
+    info "Flash cancelled."
+    return 0
+  fi
+
+  # Flash 4MB (top) chip
+  echo ""
+  info "Attach the programmer to the 4MB (top) chip."
+  prompt_continue
+
+  info "Flashing 4MB chip..."
+  run_cmd "sudo flashrom --programmer ch341a_spi -w top.rom" || return 1
+  success "4MB chip flashed."
+
+  # Flash 8MB (bottom) chip
+  echo ""
+  info "Now attach the programmer to the 8MB (bottom) chip."
+  prompt_continue
+
+  info "Flashing 8MB chip..."
+  run_cmd "sudo flashrom --programmer ch341a_spi -w bottom.rom" || return 1
+  success "8MB chip flashed."
+
+  echo ""
+  success "Coreboot has been flashed successfully!"
+  echo ""
+  info "Reassemble your laptop and power it on."
+  info "If everything went well, you should see coreboot boot!"
+}