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https://github.com/brain-hackers/u-boot-brain
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11e36ccea1
Add an entry which can hold an FMAP region as used by flashrom, an open-source flashing tool used on Linux x86 machines. This provides a simplified non-hierarchical view of the entries in the image and has a signature at the start to allow flashrom to find it in the image. Signed-off-by: Simon Glass <sjg@chromium.org>
62 lines
2.0 KiB
Python
62 lines
2.0 KiB
Python
# SPDX-License-Identifier: GPL-2.0+
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# Copyright (c) 2018 Google, Inc
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# Written by Simon Glass <sjg@chromium.org>
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#
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# Entry-type module for a Flash map, as used by the flashrom SPI flash tool
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#
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from entry import Entry
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import fmap_util
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class Entry_fmap(Entry):
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"""An entry which contains an Fmap section
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Properties / Entry arguments:
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None
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FMAP is a simple format used by flashrom, an open-source utility for
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reading and writing the SPI flash, typically on x86 CPUs. The format
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provides flashrom with a list of areas, so it knows what it in the flash.
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It can then read or write just a single area, instead of the whole flash.
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The format is defined by the flashrom project, in the file lib/fmap.h -
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see www.flashrom.org/Flashrom for more information.
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When used, this entry will be populated with an FMAP which reflects the
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entries in the current image. Note that any hierarchy is squashed, since
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FMAP does not support this.
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"""
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def __init__(self, section, etype, node):
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Entry.__init__(self, section, etype, node)
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def _GetFmap(self):
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"""Build an FMAP from the entries in the current image
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Returns:
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FMAP binary data
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"""
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def _AddEntries(areas, entry):
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entries = entry.GetEntries()
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if entries:
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for subentry in entries.values():
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_AddEntries(areas, subentry)
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else:
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areas.append(fmap_util.FmapArea(entry.image_pos or 0,
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entry.size or 0, entry.name, 0))
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entries = self.section.GetEntries()
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areas = []
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for entry in entries.values():
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_AddEntries(areas, entry)
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return fmap_util.EncodeFmap(self.section.GetSize() or 0, self.name,
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areas)
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def ObtainContents(self):
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"""Obtain a placeholder for the fmap contents"""
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self.SetContents(self._GetFmap())
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return True
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def ProcessContents(self):
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self.SetContents(self._GetFmap())
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