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diff --git a/qemu/dtc/tests/open_pack.c b/qemu/dtc/tests/open_pack.c
new file mode 100644
index 000000000..407ef6c54
--- /dev/null
+++ b/qemu/dtc/tests/open_pack.c
@@ -0,0 +1,71 @@
+/*
+ * libfdt - Flat Device Tree manipulation
+ *	Basic testcase for read-only access
+ * Copyright (C) 2006 David Gibson, IBM Corporation.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <limits.h>
+#include <stdint.h>
+
+#include <libfdt.h>
+
+#include "tests.h"
+#include "testdata.h"
+
+int main(int argc, char *argv[])
+{
+	void *fdt, *fdt1;
+	void *buf;
+	int oldsize, bufsize, packsize;
+	int err;
+	const char *inname;
+	char outname[PATH_MAX];
+
+	test_init(argc, argv);
+	fdt = load_blob_arg(argc, argv);
+	inname = argv[1];
+
+	oldsize = fdt_totalsize(fdt);
+
+	bufsize = oldsize * 2;
+
+	buf = xmalloc(bufsize);
+	/* don't leak uninitialized memory into our output */
+	memset(buf, 0, bufsize);
+
+	fdt1 = buf;
+	err = fdt_open_into(fdt, fdt1, bufsize);
+	if (err)
+		FAIL("fdt_open_into(): %s", fdt_strerror(err));
+	sprintf(outname, "opened.%s", inname);
+	save_blob(outname, fdt1);
+
+	err = fdt_pack(fdt1);
+	if (err)
+		FAIL("fdt_pack(): %s", fdt_strerror(err));
+	sprintf(outname, "repacked.%s", inname);
+	save_blob(outname, fdt1);
+
+	packsize = fdt_totalsize(fdt1);
+
+	verbose_printf("oldsize = %d, bufsize = %d, packsize = %d\n",
+		       oldsize, bufsize, packsize);
+	PASS();
+}