code: def get_all_ramdisks(self, ramdisk_ids=None, owners=None):
          
          params = {}
          if ramdisk_ids:
              self.build_list_params(params, ramdisk_ids, 'ImageId')
          if owners:
              self.build_list_params(params, owners, 'Owner')
          filter = {'image-type' : 'ramdisk'}
          self.build_filter_params(params, filter)
          return self.get_list('DescribeImages', params,
                               [('item', Image)], verb='POST')
docs: Retrieve all the EC2 ramdisks available on your account.
          Constructs a filter to allow the processing to happen server side.
  
          :type ramdisk_ids: list
          :param ramdisk_ids: A list of strings with the image IDs wanted
  
          :type owners: list
          :param owners: A list of owner IDs
  
          :rtype: list
          :return: A list of :class:`boto.ec2.image.Image`