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0ba4b3dfee
Update the Intel blob entries to support missing binaries. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
81 lines
3.0 KiB
Python
81 lines
3.0 KiB
Python
# SPDX-License-Identifier: GPL-2.0+
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# Copyright (c) 2016 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 Intel flash descriptor
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#
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import struct
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from binman.entry import Entry
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from binman.etype.blob_ext import Entry_blob_ext
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FD_SIGNATURE = struct.pack('<L', 0x0ff0a55a)
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MAX_REGIONS = 5
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# Region numbers supported by the Intel firmware format
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(REGION_DESCRIPTOR, REGION_BIOS, REGION_ME, REGION_GBE,
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REGION_PDATA) = range(5)
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class Region:
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def __init__(self, data, frba, region_num):
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pos = frba + region_num * 4
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val = struct.unpack('<L', data[pos:pos + 4])[0]
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self.base = (val & 0xfff) << 12
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self.limit = ((val & 0x0fff0000) >> 4) | 0xfff
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self.size = self.limit - self.base + 1
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class Entry_intel_descriptor(Entry_blob_ext):
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"""Intel flash descriptor block (4KB)
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Properties / Entry arguments:
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filename: Filename of file containing the descriptor. This is typically
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a 4KB binary file, sometimes called 'descriptor.bin'
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This entry is placed at the start of flash and provides information about
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the SPI flash regions. In particular it provides the base address and
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size of the ME (Management Engine) region, allowing us to place the ME
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binary in the right place.
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With this entry in your image, the position of the 'intel-me' entry will be
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fixed in the image, which avoids you needed to specify an offset for that
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region. This is useful, because it is not possible to change the position
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of the ME region without updating the descriptor.
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See README.x86 for information about x86 binary blobs.
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"""
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def __init__(self, section, etype, node):
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super().__init__(section, etype, node)
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self._regions = []
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def Pack(self, offset):
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"""Put this entry at the start of the image"""
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if self.offset is None:
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offset = self.section.GetStartOffset()
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return super().Pack(offset)
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def GetOffsets(self):
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info = {}
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if self.missing:
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# Return zero offsets so that these entries get placed somewhere
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if self.HasSibling('intel-me'):
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info['intel-me'] = [0, None]
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return info
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offset = self.data.find(FD_SIGNATURE)
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if offset == -1:
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self.Raise('Cannot find Intel Flash Descriptor (FD) signature')
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flvalsig, flmap0, flmap1, flmap2 = struct.unpack('<LLLL',
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self.data[offset:offset + 16])
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frba = ((flmap0 >> 16) & 0xff) << 4
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for i in range(MAX_REGIONS):
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self._regions.append(Region(self.data, frba, i))
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# Set the offset for ME (Management Engine) and IFWI (Integrated
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# Firmware Image), for now, since the others are not used.
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if self.HasSibling('intel-me'):
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info['intel-me'] = [self._regions[REGION_ME].base,
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self._regions[REGION_ME].size]
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if self.HasSibling('intel-ifwi'):
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info['intel-ifwi'] = [self._regions[REGION_BIOS].base, None]
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return info
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