1 # SPDX-License-Identifier: GPL-2.0+
2 # Copyright (c) 2016 Google, Inc
3 # Written by Simon Glass <sjg@chromium.org>
5 # Entry-type module for U-Boot device tree with the microcode removed
9 from entry import Entry
10 from blob import Entry_blob
13 class Entry_u_boot_dtb_with_ucode(Entry_blob):
14 """A U-Boot device tree file, with the microcode removed
16 See Entry_u_boot_ucode for full details of the 3 entries involved in this
19 def __init__(self, section, etype, node):
20 Entry_blob.__init__(self, section, etype, node)
23 self.ucode_offset = None
24 self.ucode_size = None
26 def GetDefaultFilename(self):
29 def ObtainContents(self):
30 Entry_blob.ObtainContents(self)
32 # If the section does not need microcode, there is nothing to do
33 ucode_dest_entry = self.section.FindEntryType(
34 'u-boot-spl-with-ucode-ptr')
35 if not ucode_dest_entry or not ucode_dest_entry.target_pos:
36 ucode_dest_entry = self.section.FindEntryType(
37 'u-boot-with-ucode-ptr')
38 if not ucode_dest_entry or not ucode_dest_entry.target_pos:
41 # Create a new file to hold the copied device tree
42 dtb_name = 'u-boot-dtb-with-ucode.dtb'
43 fname = tools.GetOutputFilename(dtb_name)
44 with open(fname, 'wb') as fd:
47 # Remove the microcode
48 dtb = fdt.FdtScan(fname)
49 ucode = dtb.GetNode('/microcode')
51 raise self.Raise("No /microcode node found in '%s'" % fname)
53 # There's no need to collate it (move all microcode into one place)
54 # if we only have one chunk of microcode.
55 self.collate = len(ucode.subnodes) > 1
56 for node in ucode.subnodes:
57 data_prop = node.props.get('data')
59 self.ucode_data += ''.join(data_prop.bytes)
61 prop = node.DeleteProp('data')
63 # Find the offset in the device tree of the ucode data
64 self.ucode_offset = data_prop.GetOffset() + 12
65 self.ucode_size = len(data_prop.bytes)
70 # Make this file the contents of this entry
71 self._pathname = fname