ext lib: add libfdt to enable flattened device tree support

this patch adds libfdt, a library necessary for supporting
flattened device tree support in current and future versions of
the linux/android kernel for ARM.

1 files changed, 43 insertions, 0 deletions

diff --git a/ext/libfdt/README b/ext/libfdt/README
new file mode 100644
index 000000000..4702d80bb
--- /dev/null
+++ b/ext/libfdt/README
@@ -0,0 +1,43 @@
+libfdt is an open-source library released under the BSD license:
+
+libfdt - Flat Device Tree manipulation
+
+    Redistribution and use in source and binary forms, with or
+    without modification, are permitted provided that the following
+    conditions are met:
+
+    1. Redistributions of source code must retain the above
+       copyright notice, this list of conditions and the following
+       disclaimer.
+    2. Redistributions in binary form must reproduce the above
+       copyright notice, this list of conditions and the following
+       disclaimer in the documentation and/or other materials
+       provided with the distribution.
+
+    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+    CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+    INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+    MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+    DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+    CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+    SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+    NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+    LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+    HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+    OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+    EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+libfdt allows flattened device trees to be represented as a
+"blob", which is a compact flattened format. This is useful,
+particularly for embedded systems, such as ARM, because it
+allows many different devices to be included in a single binary
+allowing for a high level of portability.
+
+The source and more information about the library can be found
+here:
+
+http://www.denx.de/wiki/U-Boot/UBootFdtInfo
+
+1) D. Gibson, B. Herrenschmidt. Device trees everywhere. 2006.
+http://ozlabs.org/~dgibson/papers/dtc-paper.pdf