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#!/usr/bin/python
#
# Copyright (C) 2016 Google, Inc
# Written by Simon Glass <sjg@chromium.org>
#
# SPDX-License-Identifier: GPL-2.0+
#
import fdt_fallback
# Bring in either the normal fdt library (which relies on libfdt) or the
# fallback one (which uses fdtget and is slower). Both provide the same
# interface for this file to use.
try:
import fdt_normal
have_libfdt = True
except ImportError:
have_libfdt = False
force_fallback = False
def FdtScan(fname, _force_fallback=False):
"""Returns a new Fdt object from the implementation we are using"""
if have_libfdt and not force_fallback and not _force_fallback:
dtb = fdt_normal.FdtNormal(fname)
else:
dtb = fdt_fallback.FdtFallback(fname)
dtb.Scan()
return dtb
def UseFallback(fallback):
global force_fallback
old_val = force_fallback
force_fallback = fallback
return old_val
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