tools/binman/etype/u_boot_dtb_with_ucode.py

   1 # SPDX-License-Identifier: GPL-2.0+
   2 # Copyright (c) 2016 Google, Inc
   3 # Written by Simon Glass <sjg@chromium.org>
   4 #
   5 # Entry-type module for U-Boot device tree with the microcode removed
   6 #
   7
   8 from entry import Entry
   9 from blob_dtb import Entry_blob_dtb
  10 import tools
  11
  12 class Entry_u_boot_dtb_with_ucode(Entry_blob_dtb):
  13     """A U-Boot device tree file, with the microcode removed
  14
  15     Properties / Entry arguments:
  16         - filename: Filename of u-boot.dtb (default 'u-boot.dtb')
  17
  18     See Entry_u_boot_ucode for full details of the three entries involved in
  19     this process. This entry provides the U-Boot device-tree file, which
  20     contains the microcode. If the microcode is not being collated into one
  21     place then the offset and size of the microcode is recorded by this entry,
  22     for use by u_boot_with_ucode_ptr. If it is being collated, then this
  23     entry deletes the microcode from the device tree (to save space) and makes
  24     it available to u_boot_ucode.
  25     """
  26     def __init__(self, section, etype, node):
  27         # Put this here to allow entry-docs and help to work without libfdt
  28         global state
  29         import state
  30
  31         Entry_blob_dtb.__init__(self, section, etype, node)
  32         self.ucode_data = b''
  33         self.collate = False
  34         self.ucode_offset = None
  35         self.ucode_size = None
  36         self.ucode = None
  37         self.ready = False
  38
  39     def GetDefaultFilename(self):
  40         return 'u-boot.dtb'
  41
  42     def GetFdtEtype(self):
  43         return 'u-boot-dtb'
  44
  45     def ProcessFdt(self, fdt):
  46         # So the module can be loaded without it
  47         import fdt
  48
  49         # If the section does not need microcode, there is nothing to do
  50         ucode_dest_entry = self.section.FindEntryType(
  51             'u-boot-spl-with-ucode-ptr')
  52         if not ucode_dest_entry or not ucode_dest_entry.target_offset:
  53             ucode_dest_entry = self.section.FindEntryType(
  54                 'u-boot-tpl-with-ucode-ptr')
  55         if not ucode_dest_entry or not ucode_dest_entry.target_offset:
  56             ucode_dest_entry = self.section.FindEntryType(
  57                 'u-boot-with-ucode-ptr')
  58         if not ucode_dest_entry or not ucode_dest_entry.target_offset:
  59             return True
  60
  61         # Remove the microcode
  62         etype = self.GetFdtEtype()
  63         fdt = state.GetFdtForEtype(etype)
  64         self.ucode = fdt.GetNode('/microcode')
  65         if not self.ucode:
  66             raise self.Raise("No /microcode node found in '%s'" % etype)
  67
  68         # There's no need to collate it (move all microcode into one place)
  69         # if we only have one chunk of microcode.
  70         self.collate = len(self.ucode.subnodes) > 1
  71         for node in self.ucode.subnodes:
  72             data_prop = node.props.get('data')
  73             if data_prop:
  74                 self.ucode_data += data_prop.bytes
  75                 if self.collate:
  76                     node.DeleteProp('data')
  77         return True
  78
  79     def ObtainContents(self):
  80         # Call the base class just in case it does something important.
  81         Entry_blob_dtb.ObtainContents(self)
  82         if self.ucode and not self.collate:
  83             for node in self.ucode.subnodes:
  84                 data_prop = node.props.get('data')
  85                 if data_prop:
  86                     # Find the offset in the device tree of the ucode data
  87                     self.ucode_offset = data_prop.GetOffset() + 12
  88                     self.ucode_size = len(data_prop.bytes)
  89                     self.ready = True
  90         else:
  91             self.ready = True
  92         return self.ready