@@ -107,3 +107,4 @@ int fdt_next_subnode(const void *fdt, int offset);
int fdt_delprop(void *fdt, int nodeoffset, const char *name);
const char *fdt_strerror(int errval);
+int fdt_pack(void *fdt);
@@ -240,3 +240,19 @@ class Fdt:
return None
return node
+ def Flush(self):
+ """Flush device tree changes back to the file
+
+ If the device tree has changed in memory, write it back to the file.
+ Subclasses can implement this if needed.
+ """
+ pass
+
+ def Pack(self):
+ """Pack the device tree down to its minimum size
+
+ When nodes and properties shrink or are deleted, wasted space can
+ build up in the device tree binary. Subclasses can implement this
+ to remove that spare space.
+ """
+ pass
@@ -140,6 +140,17 @@ class FdtNormal(Fdt):
"""
return self._fdt
+ def Flush(self):
+ """Flush device tree changes back to the file"""
+ with open(self._fname, 'wb') as fd:
+ fd.write(self._fdt)
+
+ def Pack(self):
+ """Pack the device tree down to its minimum size"""
+ CheckErr(libfdt.fdt_pack(self._fdt), 'pack')
+ fdt_len = libfdt.fdt_totalsize(self._fdt)
+ del self._fdt[fdt_len:]
+
def GetProps(self, node, path):
"""Get all properties from a node.
After any node/property deletion the device tree can be packed to remove spare space. Add a way to perform this operation. Note that for fdt_fallback, fdtput automatically packs the device tree after deletion, so no action is required here. Signed-off-by: Simon Glass <sjg@chromium.org> --- lib/libfdt/libfdt.swig | 1 + tools/dtoc/fdt.py | 16 ++++++++++++++++ tools/dtoc/fdt_normal.py | 11 +++++++++++ 3 files changed, 28 insertions(+)