2018-05-07 06:58:06 +09:00
|
|
|
# SPDX-License-Identifier: GPL-2.0+
|
2016-11-26 12:15:53 +09:00
|
|
|
# Copyright (c) 2016 Google, Inc
|
|
|
|
# Written by Simon Glass <sjg@chromium.org>
|
|
|
|
#
|
|
|
|
# Entry-type module for the 16-bit x86 start-up code for U-Boot
|
|
|
|
#
|
|
|
|
|
|
|
|
from entry import Entry
|
|
|
|
from blob import Entry_blob
|
|
|
|
|
|
|
|
class Entry_x86_start16(Entry_blob):
|
2018-07-18 04:25:35 +09:00
|
|
|
"""x86 16-bit start-up code for U-Boot
|
|
|
|
|
|
|
|
Properties / Entry arguments:
|
|
|
|
- filename: Filename of u-boot-x86-16bit.bin (default
|
|
|
|
'u-boot-x86-16bit.bin')
|
|
|
|
|
|
|
|
x86 CPUs start up in 16-bit mode, even if they are 32-bit CPUs. This code
|
|
|
|
must be placed at a particular address. This entry holds that code. It is
|
|
|
|
typically placed at offset CONFIG_SYS_X86_START16. The code is responsible
|
|
|
|
for changing to 32-bit mode and jumping to U-Boot's entry point, which
|
|
|
|
requires 32-bit mode (for 32-bit U-Boot).
|
|
|
|
|
|
|
|
For 64-bit U-Boot, the 'x86_start16_spl' entry type is used instead.
|
|
|
|
"""
|
2018-06-02 00:38:14 +09:00
|
|
|
def __init__(self, section, etype, node):
|
|
|
|
Entry_blob.__init__(self, section, etype, node)
|
2016-11-26 12:15:53 +09:00
|
|
|
|
|
|
|
def GetDefaultFilename(self):
|
|
|
|
return 'u-boot-x86-16bit.bin'
|