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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 producing a FIT
#
from collections import defaultdict, OrderedDict
import libfdt
from binman.entry import Entry
from dtoc import fdt_util
from dtoc.fdt import Fdt
from patman import tools
class Entry_fit(Entry):
"""Entry containing a FIT
This calls mkimage to create a FIT (U-Boot Flat Image Tree) based on the
input provided.
Nodes for the FIT should be written out in the binman configuration just as
they would be in a file passed to mkimage.
For example, this creates an image containing a FIT with U-Boot SPL:
binman {
fit {
description = "Test FIT";
images {
kernel@1 {
description = "SPL";
os = "u-boot";
type = "rkspi";
arch = "arm";
compression = "none";
load = <0>;
entry = <0>;
u-boot-spl {
};
};
};
};
};
Properties:
fit,external-offset: Indicates that the contents of the FIT are external
and provides the external offset. This is passsed to mkimage via
the -E and -p flags.
"""
def __init__(self, section, etype, node):
"""
Members:
_fit: FIT file being built
_fit_content: dict:
key: relative path to entry Node (from the base of the FIT)
value: List of Entry objects comprising the contents of this
node
"""
super().__init__(section, etype, node)
self._fit = None
self._fit_content = defaultdict(list)
self._fit_props = {}
def ReadNode(self):
self._ReadSubnodes()
super().ReadNode()
def _ReadSubnodes(self):
def _AddNode(base_node, depth, node):
"""Add a node to the FIT
Args:
base_node: Base Node of the FIT (with 'description' property)
depth: Current node depth (0 is the base node)
node: Current node to process
There are two cases to deal with:
- hash and signature nodes which become part of the FIT
- binman entries which are used to define the 'data' for each
image
"""
for pname, prop in node.props.items():
if pname.startswith('fit,'):
self._fit_props[pname] = prop
else:
fsw.property(pname, prop.bytes)
rel_path = node.path[len(base_node.path):]
has_images = depth == 2 and rel_path.startswith('/images/')
for subnode in node.subnodes:
if has_images and not (subnode.name.startswith('hash') or
subnode.name.startswith('signature')):
# This is a content node. We collect all of these together
# and put them in the 'data' property. They do not appear
# in the FIT.
entry = Entry.Create(self.section, subnode)
entry.ReadNode()
self._fit_content[rel_path].append(entry)
else:
with fsw.add_node(subnode.name):
_AddNode(base_node, depth + 1, subnode)
# Build a new tree with all nodes and properties starting from the
# entry node
fsw = libfdt.FdtSw()
fsw.finish_reservemap()
with fsw.add_node(''):
_AddNode(self._node, 0, self._node)
fdt = fsw.as_fdt()
# Pack this new FDT and scan it so we can add the data later
fdt.pack()
self._fdt = Fdt.FromData(fdt.as_bytearray())
self._fdt.Scan()
def ObtainContents(self):
"""Obtain the contents of the FIT
This adds the 'data' properties to the input ITB (Image-tree Binary)
then runs mkimage to process it.
"""
data = self._BuildInput(self._fdt)
if data == False:
return False
uniq = self.GetUniqueName()
input_fname = tools.GetOutputFilename('%s.itb' % uniq)
output_fname = tools.GetOutputFilename('%s.fit' % uniq)
tools.WriteFile(input_fname, data)
tools.WriteFile(output_fname, data)
args = []
ext_offset = self._fit_props.get('fit,external-offset')
if ext_offset is not None:
args += ['-E', '-p', '%x' % fdt_util.fdt32_to_cpu(ext_offset.value)]
tools.Run('mkimage', '-t', '-F', output_fname, *args)
self.SetContents(tools.ReadFile(output_fname))
return True
def _BuildInput(self, fdt):
"""Finish the FIT by adding the 'data' properties to it
Arguments:
fdt: FIT to update
Returns:
New fdt contents (bytes)
"""
for path, entries in self._fit_content.items():
node = fdt.GetNode(path)
data = b''
for entry in entries:
if not entry.ObtainContents():
return False
data += entry.GetData()
node.AddData('data', data)
fdt.Sync(auto_resize=True)
data = fdt.GetContents()
return data
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