Add a meta box to ALL Pages

Try this. This is part of some code I use.

 // Add meta boxes to Page
  add_meta_box( 'RelatedImage', __('Related images'), 'related_images_meta_box', 'page', 'normal', 'high' );

  function related_images_meta_box($object) { 
    $nonce = wp_create_nonce(plugin_basename( __FILE__ ));
  ?>
    <input type="hidden" name="wp_filebrowser_nonce" id="wp_filebrowser_nonce" value="<?php echo $nonce; ?>" />
    <table>
      <tr>
        <td>
          <label for="related_image" class="">Related image</label>
        </td>
        <td>
          <input type="text" id="related_image" name="related_image"  value="<?php echo 'your meta property' ?>" size="40" />  
        <td>
      </tr>
    </table>
  <?php }