+# SPDX-License-Identifier: GPL-2.0+
# Copyright (c) 2016 Google, Inc
# Written by Simon Glass <sjg@chromium.org>
#
-# SPDX-License-Identifier: GPL-2.0+
-#
# Entry-type module for the 16-bit x86 start-up code for U-Boot SPL
#
from blob import Entry_blob
class Entry_x86_start16_spl(Entry_blob):
- def __init__(self, image, etype, node):
- Entry_blob.__init__(self, image, etype, node)
+ """x86 16-bit start-up code for SPL
+
+ Properties / Entry arguments:
+ - filename: Filename of spl/u-boot-x86-16bit-spl.bin (default
+ 'spl/u-boot-x86-16bit-spl.bin')
+
+ x86 CPUs start up in 16-bit mode, even if they are 64-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 starting SPL, which in turn changes to
+ 64-bit mode and jumps to U-Boot (for 64-bit U-Boot).
+
+ For 32-bit U-Boot, the 'x86_start16' entry type is used instead.
+ """
+ def __init__(self, section, etype, node):
+ Entry_blob.__init__(self, section, etype, node)
def GetDefaultFilename(self):
return 'spl/u-boot-x86-16bit-spl.bin'