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# SPDX-License-Identifier: GPL-2.0+
# Copyright (c) 2016 Google, Inc
# Written by Simon Glass <sjg@chromium.org>
#
# Entry-type module for U-Boot device tree with the microcode removed
#
from entry import Entry
from blob_dtb import Entry_blob_dtb
import tools
class Entry_u_boot_dtb_with_ucode(Entry_blob_dtb):
"""A U-Boot device tree file, with the microcode removed
Properties / Entry arguments:
- filename: Filename of u-boot.dtb (default 'u-boot.dtb')
See Entry_u_boot_ucode for full details of the three entries involved in
this process. This entry provides the U-Boot device-tree file, which
contains the microcode. If the microcode is not being collated into one
place then the offset and size of the microcode is recorded by this entry,
for use by u_boot_with_ucode_ptr. If it is being collated, then this
entry deletes the microcode from the device tree (to save space) and makes
it available to u_boot_ucode.
"""
def __init__(self, section, etype, node):
# Put this here to allow entry-docs and help to work without libfdt
global state
import state
Entry_blob_dtb.__init__(self, section, etype, node)
self.ucode_data = b''
self.collate = False
self.ucode_offset = None
self.ucode_size = None
self.ucode = None
self.ready = False
def GetDefaultFilename(self):
return 'u-boot.dtb'
def GetFdtEtype(self):
return 'u-boot-dtb'
def ProcessFdt(self, fdt):
# So the module can be loaded without it
import fdt
# If the section does not need microcode, there is nothing to do
ucode_dest_entry = self.section.FindEntryType(
'u-boot-spl-with-ucode-ptr')
if not ucode_dest_entry or not ucode_dest_entry.target_offset:
ucode_dest_entry = self.section.FindEntryType(
'u-boot-tpl-with-ucode-ptr')
if not ucode_dest_entry or not ucode_dest_entry.target_offset:
ucode_dest_entry = self.section.FindEntryType(
'u-boot-with-ucode-ptr')
if not ucode_dest_entry or not ucode_dest_entry.target_offset:
return True
# Remove the microcode
etype = self.GetFdtEtype()
fdt = state.GetFdtForEtype(etype)
self.ucode = fdt.GetNode('/microcode')
if not self.ucode:
raise self.Raise("No /microcode node found in '%s'" % etype)
# There's no need to collate it (move all microcode into one place)
# if we only have one chunk of microcode.
self.collate = len(self.ucode.subnodes) > 1
for node in self.ucode.subnodes:
data_prop = node.props.get('data')
if data_prop:
self.ucode_data += data_prop.bytes
if self.collate:
node.DeleteProp('data')
return True
def ObtainContents(self):
# Call the base class just in case it does something important.
Entry_blob_dtb.ObtainContents(self)
if self.ucode and not self.collate:
for node in self.ucode.subnodes:
data_prop = node.props.get('data')
if data_prop:
# Find the offset in the device tree of the ucode data
self.ucode_offset = data_prop.GetOffset() + 12
self.ucode_size = len(data_prop.bytes)
self.ready = True
else:
self.ready = True
return self.ready
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