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authorGerald Van Baren <gvb@unssw.com>2012-10-15 22:24:36 -0400
committerGerald Van Baren <gvb@unssw.com>2012-10-15 22:24:36 -0400
commitc71b64f3617b5a4362c6e4e0aefdd66d6ac6affd (patch)
tree947b4febb1b863d9028274c064da2f698b803120 /include
parent8ac88f2d2818c8efc1558626a4e7fb47dcc18987 (diff)
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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> From git://git.jdl.com/software/dtc.git patch hash be6026838 with adaptations to include/libfdt.h and lib/libfdt/Makefile for the U-Boot environment. Signed-off-by: Gerald Van Baren <vanbaren@cideas.com>
Diffstat (limited to 'include')
-rw-r--r--include/libfdt.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/libfdt.h b/include/libfdt.h
index 4589c5f..c93ae28 100644
--- a/include/libfdt.h
+++ b/include/libfdt.h
@@ -1014,6 +1014,7 @@ int fdt_finish(void *fdt);
/* Read-write functions */
/**********************************************************************/
+int fdt_create_empty_tree(void *buf, int bufsize);
int fdt_open_into(const void *fdt, void *buf, int bufsize);
int fdt_pack(void *fdt);