diff options
| -rw-r--r-- | tools/binman/control.py | 2 | ||||
| -rw-r--r-- | tools/dtoc/fdt.py | 91 | ||||
| -rwxr-xr-x | tools/dtoc/test_fdt.py | 8 |
3 files changed, 91 insertions, 10 deletions
diff --git a/tools/binman/control.py b/tools/binman/control.py index 8c48008fc75..ded1b71109b 100644 --- a/tools/binman/control.py +++ b/tools/binman/control.py @@ -183,6 +183,7 @@ def Binman(options, args): image.AddMissingProperties() image.ProcessFdt(dtb) + dtb.Sync(auto_resize=True) dtb.Pack() dtb.Flush() @@ -199,6 +200,7 @@ def Binman(options, args): image.SetImagePos() if options.update_fdt: image.SetCalculatedProperties() + dtb.Sync() image.ProcessEntryContents() image.WriteSymbols() image.BuildImage() diff --git a/tools/dtoc/fdt.py b/tools/dtoc/fdt.py index 55baa3857f7..76cd66fbf95 100644 --- a/tools/dtoc/fdt.py +++ b/tools/dtoc/fdt.py @@ -43,6 +43,7 @@ class Prop: self.name = name self.value = None self.bytes = str(bytes) + self.dirty = False if not bytes: self.type = TYPE_BOOL self.value = True @@ -160,6 +161,45 @@ class Prop: self._node._fdt.CheckCache() return self._node._fdt.GetStructOffset(self._offset) + def SetInt(self, val): + """Set the integer value of the property + + The device tree is marked dirty so that the value will be written to + the block on the next sync. + + Args: + val: Integer value (32-bit, single cell) + """ + self.bytes = struct.pack('>I', val); + self.value = val + self.type = TYPE_INT + self.dirty = True + + def Sync(self, auto_resize=False): + """Sync property changes back to the device tree + + This updates the device tree blob with any changes to this property + since the last sync. + + Args: + auto_resize: Resize the device tree automatically if it does not + have enough space for the update + + Raises: + FdtException if auto_resize is False and there is not enough space + """ + if self._offset is None or self.dirty: + node = self._node + fdt_obj = node._fdt._fdt_obj + if auto_resize: + while fdt_obj.setprop(node.Offset(), self.name, self.bytes, + (libfdt.NOSPACE,)) == -libfdt.NOSPACE: + fdt_obj.resize(fdt_obj.totalsize() + 1024) + fdt_obj.setprop(node.Offset(), self.name, self.bytes) + else: + fdt_obj.setprop(node.Offset(), self.name, self.bytes) + + class Node: """A device tree node @@ -284,13 +324,7 @@ class Node: Args: prop_name: Name of property """ - fdt_obj = self._fdt._fdt_obj - if fdt_obj.setprop_u32(self.Offset(), prop_name, 0, - (libfdt.NOSPACE,)) == -libfdt.NOSPACE: - fdt_obj.resize(fdt_obj.totalsize() + 1024) - fdt_obj.setprop_u32(self.Offset(), prop_name, 0) - self.props[prop_name] = Prop(self, -1, prop_name, '\0' * 4) - self._fdt.Invalidate() + self.props[prop_name] = Prop(self, None, prop_name, '\0' * 4) def SetInt(self, prop_name, val): """Update an integer property int the device tree. @@ -301,8 +335,34 @@ class Node: prop_name: Name of property val: Value to set """ - fdt_obj = self._fdt._fdt_obj - fdt_obj.setprop_u32(self.Offset(), prop_name, val) + self.props[prop_name].SetInt(val) + + def Sync(self, auto_resize=False): + """Sync node changes back to the device tree + + This updates the device tree blob with any changes to this node and its + subnodes since the last sync. + + Args: + auto_resize: Resize the device tree automatically if it does not + have enough space for the update + + Raises: + FdtException if auto_resize is False and there is not enough space + """ + # Sync subnodes in reverse so that we don't disturb node offsets for + # nodes that are earlier in the DT. This avoids an O(n^2) rescan of + # node offsets. + for node in reversed(self.subnodes): + node.Sync(auto_resize) + + # Sync properties now, whose offsets should not have been disturbed. + # We do this after subnodes, since this disturbs the offsets of these + # properties. + prop_list = sorted(self.props.values(), key=lambda prop: prop._offset, + reverse=True) + for prop in prop_list: + prop.Sync(auto_resize) class Fdt: @@ -381,6 +441,19 @@ class Fdt: with open(self._fname, 'wb') as fd: fd.write(self._fdt_obj.as_bytearray()) + def Sync(self, auto_resize=False): + """Make sure any DT changes are written to the blob + + Args: + auto_resize: Resize the device tree automatically if it does not + have enough space for the update + + Raises: + FdtException if auto_resize is False and there is not enough space + """ + self._root.Sync(auto_resize) + self.Invalidate() + def Pack(self): """Pack the device tree down to its minimum size diff --git a/tools/dtoc/test_fdt.py b/tools/dtoc/test_fdt.py index e88d19f80ef..4a67f8949df 100755 --- a/tools/dtoc/test_fdt.py +++ b/tools/dtoc/test_fdt.py @@ -337,6 +337,7 @@ class TestProp(unittest.TestCase): self.node.AddZeroProp('one') self.node.AddZeroProp('two') self.node.AddZeroProp('three') + self.dtb.Sync(auto_resize=True) # Updating existing properties should be OK, since the device-tree size # does not change @@ -344,12 +345,17 @@ class TestProp(unittest.TestCase): self.node.SetInt('one', 1) self.node.SetInt('two', 2) self.node.SetInt('three', 3) + self.dtb.Sync(auto_resize=False) # This should fail since it would need to increase the device-tree size + self.node.AddZeroProp('four') with self.assertRaises(libfdt.FdtException) as e: - self.node.SetInt('four', 4) + self.dtb.Sync(auto_resize=False) self.assertIn('FDT_ERR_NOSPACE', str(e.exception)) + def testAddNode(self): + self.fdt.pack() + class TestFdtUtil(unittest.TestCase): """Tests for the fdt_util module |