mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-15 15:46:16 +09:00
e1925fa520
Add support for locating an image's Fdt map which is used to determine the contents and structure of the image. Signed-off-by: Simon Glass <sjg@chromium.org>
131 lines
3.9 KiB
Python
131 lines
3.9 KiB
Python
# SPDX-License-Identifier: GPL-2.0+
|
|
# Copyright (c) 2018 Google, Inc
|
|
# Written by Simon Glass <sjg@chromium.org>
|
|
|
|
"""# Entry-type module for a full map of the firmware image
|
|
|
|
This handles putting an FDT into the image with just the information about the
|
|
image.
|
|
"""
|
|
|
|
import libfdt
|
|
|
|
from entry import Entry
|
|
from fdt import Fdt
|
|
import state
|
|
import tools
|
|
|
|
FDTMAP_MAGIC = b'_FDTMAP_'
|
|
FDTMAP_HDR_LEN = 16
|
|
|
|
def LocateFdtmap(data):
|
|
"""Search an image for an fdt map
|
|
|
|
Args:
|
|
data: Data to search
|
|
|
|
Returns:
|
|
Position of fdt map in data, or None if not found. Note that the
|
|
position returned is of the FDT header, i.e. before the FDT data
|
|
"""
|
|
hdr_pos = data.find(FDTMAP_MAGIC)
|
|
size = len(data)
|
|
if hdr_pos != -1:
|
|
hdr = data[hdr_pos:hdr_pos + FDTMAP_HDR_LEN]
|
|
if len(hdr) == FDTMAP_HDR_LEN:
|
|
return hdr_pos
|
|
return None
|
|
|
|
class Entry_fdtmap(Entry):
|
|
"""An entry which contains an FDT map
|
|
|
|
Properties / Entry arguments:
|
|
None
|
|
|
|
An FDT map is just a header followed by an FDT containing a list of all the
|
|
entries in the image. The root node corresponds to the image node in the
|
|
original FDT, and an image-name property indicates the image name in that
|
|
original tree.
|
|
|
|
The header is the string _FDTMAP_ followed by 8 unused bytes.
|
|
|
|
When used, this entry will be populated with an FDT map which reflects the
|
|
entries in the current image. Hierarchy is preserved, and all offsets and
|
|
sizes are included.
|
|
|
|
Note that the -u option must be provided to ensure that binman updates the
|
|
FDT with the position of each entry.
|
|
|
|
Example output for a simple image with U-Boot and an FDT map:
|
|
|
|
/ {
|
|
size = <0x00000112>;
|
|
image-pos = <0x00000000>;
|
|
offset = <0x00000000>;
|
|
u-boot {
|
|
size = <0x00000004>;
|
|
image-pos = <0x00000000>;
|
|
offset = <0x00000000>;
|
|
};
|
|
fdtmap {
|
|
size = <0x0000010e>;
|
|
image-pos = <0x00000004>;
|
|
offset = <0x00000004>;
|
|
};
|
|
};
|
|
"""
|
|
def __init__(self, section, etype, node):
|
|
Entry.__init__(self, section, etype, node)
|
|
|
|
def _GetFdtmap(self):
|
|
"""Build an FDT map from the entries in the current image
|
|
|
|
Returns:
|
|
FDT map binary data
|
|
"""
|
|
def _AddNode(node):
|
|
"""Add a node to the FDT map"""
|
|
for pname, prop in node.props.items():
|
|
fsw.property(pname, prop.bytes)
|
|
for subnode in node.subnodes:
|
|
with fsw.add_node(subnode.name):
|
|
_AddNode(subnode)
|
|
|
|
# Get the FDT data into an Fdt object
|
|
data = state.GetFdtContents()[1]
|
|
infdt = Fdt.FromData(data)
|
|
infdt.Scan()
|
|
|
|
# Find the node for the image containing the Fdt-map entry
|
|
path = self.section.GetPath()
|
|
node = infdt.GetNode(path)
|
|
if not node:
|
|
self.Raise("Internal error: Cannot locate node for path '%s'" %
|
|
path)
|
|
|
|
# Build a new tree with all nodes and properties starting from that node
|
|
fsw = libfdt.FdtSw()
|
|
fsw.finish_reservemap()
|
|
with fsw.add_node(''):
|
|
_AddNode(node)
|
|
fdt = fsw.as_fdt()
|
|
|
|
# Pack this new FDT and return its contents
|
|
fdt.pack()
|
|
outfdt = Fdt.FromData(fdt.as_bytearray())
|
|
data = FDTMAP_MAGIC + tools.GetBytes(0, 8) + outfdt.GetContents()
|
|
return data
|
|
|
|
def ObtainContents(self):
|
|
"""Obtain a placeholder for the fdt-map contents"""
|
|
self.SetContents(self._GetFdtmap())
|
|
return True
|
|
|
|
def ProcessContents(self):
|
|
"""Write an updated version of the FDT map to this entry
|
|
|
|
This is necessary since new data may have been written back to it during
|
|
processing, e.g. the image-pos properties.
|
|
"""
|
|
return self.ProcessContentsUpdate(self._GetFdtmap())
|