mirror of
https://github.com/brain-hackers/u-boot-brain
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bf776679a7
At present patman sets the python path on startup so that it can access the libraries it needs. If we convert to use absolute imports this is not necessary. Move patman to use absolute imports. This requires changes in tools which use the patman libraries (which is most of them). Signed-off-by: Simon Glass <sjg@chromium.org>
97 lines
3.3 KiB
Python
97 lines
3.3 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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# Support for a Chromium OS Google Binary Block, used to record read-only
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# information mostly used by firmware.
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from collections import OrderedDict
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from patman import command
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from binman.entry import Entry, EntryArg
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from dtoc import fdt_util
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from patman import tools
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# Build GBB flags.
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# (src/platform/vboot_reference/firmware/include/gbb_header.h)
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gbb_flag_properties = {
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'dev-screen-short-delay': 0x1,
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'load-option-roms': 0x2,
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'enable-alternate-os': 0x4,
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'force-dev-switch-on': 0x8,
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'force-dev-boot-usb': 0x10,
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'disable-fw-rollback-check': 0x20,
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'enter-triggers-tonorm': 0x40,
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'force-dev-boot-legacy': 0x80,
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'faft-key-override': 0x100,
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'disable-ec-software-sync': 0x200,
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'default-dev-boot-legacy': 0x400,
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'disable-pd-software-sync': 0x800,
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'disable-lid-shutdown': 0x1000,
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'force-dev-boot-fastboot-full-cap': 0x2000,
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'enable-serial': 0x4000,
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'disable-dwmp': 0x8000,
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}
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class Entry_gbb(Entry):
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"""An entry which contains a Chromium OS Google Binary Block
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Properties / Entry arguments:
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- hardware-id: Hardware ID to use for this build (a string)
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- keydir: Directory containing the public keys to use
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- bmpblk: Filename containing images used by recovery
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Chromium OS uses a GBB to store various pieces of information, in particular
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the root and recovery keys that are used to verify the boot process. Some
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more details are here:
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https://www.chromium.org/chromium-os/firmware-porting-guide/2-concepts
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but note that the page dates from 2013 so is quite out of date. See
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README.chromium for how to obtain the required keys and tools.
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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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self.hardware_id, self.keydir, self.bmpblk = self.GetEntryArgsOrProps(
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[EntryArg('hardware-id', str),
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EntryArg('keydir', str),
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EntryArg('bmpblk', str)])
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# Read in the GBB flags from the config
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self.gbb_flags = 0
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flags_node = node.FindNode('flags')
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if flags_node:
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for flag, value in gbb_flag_properties.items():
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if fdt_util.GetBool(flags_node, flag):
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self.gbb_flags |= value
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def ObtainContents(self):
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gbb = 'gbb.bin'
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fname = tools.GetOutputFilename(gbb)
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if not self.size:
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self.Raise('GBB must have a fixed size')
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gbb_size = self.size
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bmpfv_size = gbb_size - 0x2180
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if bmpfv_size < 0:
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self.Raise('GBB is too small (minimum 0x2180 bytes)')
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sizes = [0x100, 0x1000, bmpfv_size, 0x1000]
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sizes = ['%#x' % size for size in sizes]
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keydir = tools.GetInputFilename(self.keydir)
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gbb_set_command = [
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'gbb_utility', '-s',
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'--hwid=%s' % self.hardware_id,
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'--rootkey=%s/root_key.vbpubk' % keydir,
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'--recoverykey=%s/recovery_key.vbpubk' % keydir,
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'--flags=%d' % self.gbb_flags,
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'--bmpfv=%s' % tools.GetInputFilename(self.bmpblk),
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fname]
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tools.Run('futility', 'gbb_utility', '-c', ','.join(sizes), fname)
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tools.Run('futility', *gbb_set_command)
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self.SetContents(tools.ReadFile(fname))
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return True
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