tools/binman/etype/fill.py

   1 # SPDX-License-Identifier: GPL-2.0+
   2 # Copyright (c) 2018 Google, Inc
   3 # Written by Simon Glass <sjg@chromium.org>
   4 #
   5
   6 from binman.entry import Entry
   7 from dtoc import fdt_util
   8 from u_boot_pylib import tools
   9
  10 class Entry_fill(Entry):
  11     """An entry which is filled to a particular byte value
  12
  13     Properties / Entry arguments:
  14         - fill-byte: Byte to use to fill the entry
  15
  16     Note that the size property must be set since otherwise this entry does not
  17     know how large it should be.
  18
  19     You can often achieve the same effect using the pad-byte property of the
  20     overall image, in that the space between entries will then be padded with
  21     that byte. But this entry is sometimes useful for explicitly setting the
  22     byte value of a region.
  23     """
  24     def __init__(self, section, etype, node):
  25         super().__init__(section, etype, node)
  26         self.required_props = ['size']
  27
  28     def ReadNode(self):
  29         super().ReadNode()
  30         self.fill_value = fdt_util.GetByte(self._node, 'fill-byte', 0)
  31
  32     def ObtainContents(self):
  33         self.SetContents(tools.get_bytes(self.fill_value, self.size))
  34         return True