tree c2f2576729dcb0b5187956cb77a3f6c1a85c1838
parent cbf1410eab4b7ce7be1b15f985ef71bfc1f5886d
author David Gibson <david@gibson.dropbear.id.au> 1338523958 +1000
committer Jon Loeliger <jdl@jdl.com> 1338732977 -0500

libfdt: Add helper function to create a trivial, empty tree

The libfdt read/write functions are now usable enough that it's become a
moderately common pattern to use them to build and manipulate a device
tree from scratch.  For example, we do so ourself in our rw_tree1 testcase,
and qemu is starting to use this model when building device trees for some
targets such as e500.

However, the read/write functions require some sort of valid tree to begin
with, so this necessitates either having a trivial canned dtb to begin with
or, more commonly, creating an empty tree using the serial-write functions
first.

This patch adds a helper function which uses the serial-write functions to
create a trivial, empty but complete and valid tree in a supplied buffer,
ready for manipulation with the read/write functions.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>