Image creation proceeds in the following order, for each entry in the image.
-1. ProcessFdt() - process the device tree information as required by the
+1. AddMissingProperties() - binman can add calculated values to the device
+tree as part of its processing, for example the position and size of each
+entry. This method adds any properties associated with this, expanding the
+device tree as needed. These properties can have placeholder values which are
+set later by SetCalculatedProperties(). By that stage the size of sections
+cannot be changed (since it would cause the images to need to be repacked),
+but the correct values can be inserted.
+
+2. ProcessFdt() - process the device tree information as required by the
particular entry. This may involve adding or deleting properties. If the
processing is complete, this method should return True. If the processing
cannot complete because it needs the ProcessFdt() method of another entry to
run first, this method should return False, in which case it will be called
again later.
-2. GetEntryContents() - the contents of each entry are obtained, normally by
+3. GetEntryContents() - the contents of each entry are obtained, normally by
reading from a file. This calls the Entry.ObtainContents() to read the
contents. The default version of Entry.ObtainContents() calls
Entry.GetDefaultFilename() and then reads that file. So a common mechanism
retry calling the functions a few times if False is returned, allowing
dependencies between the contents of different entries.
-3. GetEntryPositions() - calls Entry.GetPositions() for each entry. This can
+4. GetEntryPositions() - calls Entry.GetPositions() for each entry. This can
return a dict containing entries that need updating. The key should be the
entry name and the value is a tuple (pos, size). This allows an entry to
provide the position and size for other entries. The default implementation
of GetEntryPositions() returns {}.
-4. PackEntries() - calls Entry.Pack() which figures out the position and
+5. PackEntries() - calls Entry.Pack() which figures out the position and
size of an entry. The 'current' image position is passed in, and the function
returns the position immediately after the entry being packed. The default
implementation of Pack() is usually sufficient.
-5. CheckSize() - checks that the contents of all the entries fits within
+6. CheckSize() - checks that the contents of all the entries fits within
the image size. If the image does not have a defined size, the size is set
large enough to hold all the entries.
-6. CheckEntries() - checks that the entries do not overlap, nor extend
+7. CheckEntries() - checks that the entries do not overlap, nor extend
outside the image.
-7. ProcessEntryContents() - this calls Entry.ProcessContents() on each entry.
+8. SetCalculatedProperties() - update any calculated properties in the device
+tree. This sets the correct 'pos' and 'size' vaues, for example.
+
+9. ProcessEntryContents() - this calls Entry.ProcessContents() on each entry.
The default implementatoin does nothing. This can be overriden to adjust the
contents of an entry in some way. For example, it would be possible to create
an entry containing a hash of the contents of some other entries. At this
stage the position and size of entries should not be adjusted.
-8. WriteSymbols() - write the value of symbols into the U-Boot SPL binary.
+10. WriteSymbols() - write the value of symbols into the U-Boot SPL binary.
See 'Access to binman entry positions at run time' below for a description of
what happens in this stage.
-9. BuildImage() - builds the image and writes it to a file. This is the final
+11. BuildImage() - builds the image and writes it to a file. This is the final
step.
entry.SetPrefix(self._name_prefix)
self._entries[node.name] = entry
+ def AddMissingProperties(self):
+ for entry in self._entries.values():
+ entry.AddMissingProperties()
+
+ def SetCalculatedProperties(self):
+ for entry in self._entries.values():
+ entry.SetCalculatedProperties()
+
def ProcessFdt(self, fdt):
todo = self._entries.values()
for passnum in range(3):
default=False, help='run tests')
parser.add_option('-T', '--test-coverage', action='store_true',
default=False, help='run tests and check for 100% coverage')
+ parser.add_option('-u', '--update-fdt', action='store_true',
+ default=False, help='Update the binman node with position/size info')
parser.add_option('-v', '--verbosity', default=1,
type='int', help='Control verbosity: 0=silent, 1=progress, 3=full, '
'4=debug')
# without changing the device-tree size, thus ensuring that our
# entry positions remain the same.
for image in images.values():
+ if options.update_fdt:
+ image.AddMissingProperties()
image.ProcessFdt(dtb)
dtb.Pack()
image.PackEntries()
image.CheckSize()
image.CheckEntries()
+ if options.update_fdt:
+ image.SetCalculatedProperties()
image.ProcessEntryContents()
image.WriteSymbols()
image.BuildImage()
self.align_end = fdt_util.GetInt(self._node, 'align-end')
self.pos_unset = fdt_util.GetBool(self._node, 'pos-unset')
+ def AddMissingProperties(self):
+ """Add new properties to the device tree as needed for this entry"""
+ for prop in ['pos', 'size']:
+ if not prop in self._node.props:
+ self._node.AddZeroProp(prop)
+
+ def SetCalculatedProperties(self):
+ """Set the value of device-tree properties calculated by binman"""
+ self._node.SetInt('pos', self.pos)
+ self._node.SetInt('size', self.size)
+
def ProcessFdt(self, fdt):
return True
def ProcessFdt(self, fdt):
return self._section.ProcessFdt(fdt)
+ def AddMissingProperties(self):
+ Entry.AddMissingProperties(self)
+ self._section.AddMissingProperties()
+
def ObtainContents(self):
return self._section.GetEntryContents()
"""Write symbol values into binary files for access at run time"""
self._section.WriteSymbols()
+ def SetCalculatedProperties(self):
+ Entry.SetCalculatedProperties(self)
+ self._section.SetCalculatedProperties()
+
def ProcessContents(self):
self._section.ProcessEntryContents()
super(Entry_section, self).ProcessContents()
self._filename = filename
self._section = bsection.Section('main-section', self._node)
+ def AddMissingProperties(self):
+ """Add properties that are not present in the device tree
+
+ When binman has completed packing the entries the position and size of
+ each entry are known. But before this the device tree may not specify
+ these. Add any missing properties, with a dummy value, so that the
+ size of the entry is correct. That way we can insert the correct values
+ later.
+ """
+ self._section.AddMissingProperties()
+
def ProcessFdt(self, fdt):
return self._section.ProcessFdt(fdt)
"""Check that entries do not overlap or extend outside the image"""
self._section.CheckEntries()
+ def SetCalculatedProperties(self):
+ self._section.SetCalculatedProperties()
+
def ProcessEntryContents(self):
"""Call the ProcessContents() method for each entry
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