1 # Copyright (c) 2016 Google, Inc
2 ## Written by Simon Glass <sjg@chromium.org>
4 # SPDX-License-Identifier: GPL-2.0+
6 # Entry-type module for U-Boot device tree with the microcode removed
10 from entry import Entry
11 from blob import Entry_blob
14 class Entry_u_boot_dtb_with_ucode(Entry_blob):
15 """A U-Boot device tree file, with the microcode removed
17 See Entry_u_boot_ucode for full details of the 3 entries involved in this
20 def __init__(self, image, etype, node):
21 Entry_blob.__init__(self, image, etype, node)
24 self.ucode_offset = None
25 self.ucode_size = None
27 def GetDefaultFilename(self):
30 def ObtainContents(self):
31 Entry_blob.ObtainContents(self)
33 # If the image does not need microcode, there is nothing to do
34 ucode_dest_entry = self.image.FindEntryType('u-boot-with-ucode-ptr')
35 if not ucode_dest_entry or not ucode_dest_entry.target_pos:
38 # Create a new file to hold the copied device tree
39 dtb_name = 'u-boot-dtb-with-ucode.dtb'
40 fname = tools.GetOutputFilename(dtb_name)
41 with open(fname, 'wb') as fd:
44 # Remove the microcode
45 fdt = fdt_select.FdtScan(fname)
47 ucode = fdt.GetNode('/microcode')
49 raise self.Raise("No /microcode node found in '%s'" % fname)
51 # There's no need to collate it (move all microcode into one place)
52 # if we only have one chunk of microcode.
53 self.collate = len(ucode.subnodes) > 1
54 for node in ucode.subnodes:
55 data_prop = node.props.get('data')
57 self.ucode_data += ''.join(data_prop.bytes)
59 poffset = data_prop.GetOffset()
61 # We cannot obtain a property offset. Collate instead.
64 # Find the offset in the device tree of the ucode data
65 self.ucode_offset = poffset + 12
66 self.ucode_size = len(data_prop.bytes)
68 prop = node.DeleteProp('data')
73 # Make this file the contents of this entry
74 self._pathname = fname