tools/binman/etype/x86_reset16.py

   1 # SPDX-License-Identifier: GPL-2.0+
   2 # Copyright (c) 2016 Google, Inc
   3 # Written by Simon Glass <sjg@chromium.org>
   4 #
   5 # Entry-type module for the 16-bit x86 reset code for U-Boot
   6 #
   7
   8 from binman.entry import Entry
   9 from binman.etype.blob import Entry_blob
  10
  11 class Entry_x86_reset16(Entry_blob):
  12     """x86 16-bit reset code for U-Boot
  13
  14     Properties / Entry arguments:
  15         - filename: Filename of u-boot-x86-reset16.bin (default
  16             'u-boot-x86-reset16.bin')
  17
  18     x86 CPUs start up in 16-bit mode, even if they are 32-bit CPUs. This code
  19     must be placed at a particular address. This entry holds that code. It is
  20     typically placed at offset CONFIG_RESET_VEC_LOC. The code is responsible
  21     for jumping to the x86-start16 code, which continues execution.
  22
  23     For 64-bit U-Boot, the 'x86_reset16_spl' entry type is used instead.
  24     """
  25     def __init__(self, section, etype, node):
  26         Entry_blob.__init__(self, section, etype, node)
  27
  28     def GetDefaultFilename(self):
  29         return 'u-boot-x86-reset16.bin'