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.

13 files changed, 3519 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
diff --git a/ext/libfdt/SConscript b/ext/libfdt/SConscript
new file mode 100644
index 000000000..fb4411535
--- /dev/null
+++ b/ext/libfdt/SConscript
@@ -0,0 +1,49 @@
+# -*- mode:python -*-
+
+# Copyright (c) 2013 The Regents of The University of Michigan
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met: redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer;
+# 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;
+# neither the name of the copyright holders nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# 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.
+#
+# Authors: Anthony Gutierrez
+
+Import('main')
+
+fdt_files = []
+
+def FdtFile(filename):
+    fdt_files.append(File(filename))
+
+FdtFile('fdt.c')
+FdtFile('fdt_ro.c')
+FdtFile('fdt_rw.c')
+FdtFile('fdt_sw.c')
+FdtFile('fdt_wip.c')
+FdtFile('fdt_empty_tree.c')
+FdtFile('fdt_strerror.c')
+
+main.Library('fdt', [main.SharedObject(f) for f in fdt_files])
+main.Prepend(CPPPATH=Dir('.'))
+main.Append(LIBS=['fdt'])
+main.Prepend(LIBPATH=[Dir('.')])
diff --git a/ext/libfdt/fdt.c b/ext/libfdt/fdt.c
new file mode 100644
index 000000000..cae9a3ed2
--- /dev/null
+++ b/ext/libfdt/fdt.c
@@ -0,0 +1,201 @@
+/*
+ * libfdt - Flat Device Tree manipulation
+ * Copyright (C) 2006 David Gibson, IBM Corporation.
+ *
+ *     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.
+ */
+#include <fdt.h>
+#include <libfdt.h>
+
+#include "libfdt_env.h"
+#include "libfdt_internal.h"
+
+int fdt_check_header(const void *fdt)
+{
+        if (fdt_magic(fdt) == FDT_MAGIC) {
+                /* Complete tree */
+                if (fdt_version(fdt) < FDT_FIRST_SUPPORTED_VERSION)
+                        return -FDT_ERR_BADVERSION;
+                if (fdt_last_comp_version(fdt) > FDT_LAST_SUPPORTED_VERSION)
+                        return -FDT_ERR_BADVERSION;
+        } else if (fdt_magic(fdt) == FDT_SW_MAGIC) {
+                /* Unfinished sequential-write blob */
+                if (fdt_size_dt_struct(fdt) == 0)
+                        return -FDT_ERR_BADSTATE;
+        } else {
+                return -FDT_ERR_BADMAGIC;
+        }
+
+        return 0;
+}
+
+const void *fdt_offset_ptr(const void *fdt, int offset, unsigned int len)
+{
+        const char *p;
+
+        if (fdt_version(fdt) >= 0x11)
+                if (((offset + len) < offset)
+                    || ((offset + len) > fdt_size_dt_struct(fdt)))
+                        return NULL;
+
+        p = _fdt_offset_ptr(fdt, offset);
+
+        if (p + len < p)
+                return NULL;
+        return p;
+}
+
+uint32_t fdt_next_tag(const void *fdt, int startoffset, int *nextoffset)
+{
+        const fdt32_t *tagp, *lenp;
+        uint32_t tag;
+        int offset = startoffset;
+        const char *p;
+
+        *nextoffset = -FDT_ERR_TRUNCATED;
+        tagp = fdt_offset_ptr(fdt, offset, FDT_TAGSIZE);
+        if (!tagp)
+                return FDT_END; /* premature end */
+        tag = fdt32_to_cpu(*tagp);
+        offset += FDT_TAGSIZE;
+
+        *nextoffset = -FDT_ERR_BADSTRUCTURE;
+        switch (tag) {
+        case FDT_BEGIN_NODE:
+                /* skip name */
+                do {
+                        p = fdt_offset_ptr(fdt, offset++, 1);
+                } while (p && (*p != '\0'));
+                if (!p)
+                        return FDT_END; /* premature end */
+                break;
+
+        case FDT_PROP:
+                lenp = fdt_offset_ptr(fdt, offset, sizeof(*lenp));
+                if (!lenp)
+                        return FDT_END; /* premature end */
+                /* skip-name offset, length and value */
+                offset += sizeof(struct fdt_property) - FDT_TAGSIZE
+                        + fdt32_to_cpu(*lenp);
+                break;
+
+        case FDT_END:
+        case FDT_END_NODE:
+        case FDT_NOP:
+                break;
+
+        default:
+                return FDT_END;
+        }
+
+        if (!fdt_offset_ptr(fdt, startoffset, offset - startoffset))
+                return FDT_END; /* premature end */
+
+        *nextoffset = FDT_TAGALIGN(offset);
+        return tag;
+}
+
+int _fdt_check_node_offset(const void *fdt, int offset)
+{
+        if ((offset < 0) || (offset % FDT_TAGSIZE)
+            || (fdt_next_tag(fdt, offset, &offset) != FDT_BEGIN_NODE))
+                return -FDT_ERR_BADOFFSET;
+
+        return offset;
+}
+
+int _fdt_check_prop_offset(const void *fdt, int offset)
+{
+        if ((offset < 0) || (offset % FDT_TAGSIZE)
+            || (fdt_next_tag(fdt, offset, &offset) != FDT_PROP))
+                return -FDT_ERR_BADOFFSET;
+
+        return offset;
+}
+
+int fdt_next_node(const void *fdt, int offset, int *depth)
+{
+        int nextoffset = 0;
+        uint32_t tag;
+
+        if (offset >= 0)
+                if ((nextoffset = _fdt_check_node_offset(fdt, offset)) < 0)
+                        return nextoffset;
+
+        do {
+                offset = nextoffset;
+                tag = fdt_next_tag(fdt, offset, &nextoffset);
+
+                switch (tag) {
+                case FDT_PROP:
+                case FDT_NOP:
+                        break;
+
+                case FDT_BEGIN_NODE:
+                        if (depth)
+                                (*depth)++;
+                        break;
+
+                case FDT_END_NODE:
+                        if (depth && ((--(*depth)) < 0))
+                                return nextoffset;
+                        break;
+
+                case FDT_END:
+                        if ((nextoffset >= 0)
+                            || ((nextoffset == -FDT_ERR_TRUNCATED) && !depth))
+                                return -FDT_ERR_NOTFOUND;
+                        else
+                                return nextoffset;
+                }
+        } while (tag != FDT_BEGIN_NODE);
+
+        return offset;
+}
+
+const char *_fdt_find_string(const char *strtab, int tabsize, const char *s)
+{
+        int len = strlen(s) + 1;
+        const char *last = strtab + tabsize - len;
+        const char *p;
+
+        for (p = strtab; p <= last; p++)
+                if (memcmp(p, s, len) == 0)
+                        return p;
+        return NULL;
+}
+
+int fdt_move(const void *fdt, void *buf, int bufsize)
+{
+        FDT_CHECK_HEADER(fdt);
+
+        if (fdt_totalsize(fdt) > bufsize)
+                return -FDT_ERR_NOSPACE;
+
+        memmove(buf, fdt, fdt_totalsize(fdt));
+        return 0;
+}
diff --git a/ext/libfdt/fdt.h b/ext/libfdt/fdt.h
new file mode 100644
index 000000000..fd0a57d28
--- /dev/null
+++ b/ext/libfdt/fdt.h
@@ -0,0 +1,100 @@
+/*
+ * libfdt - Flat Device Tree manipulation
+ * Copyright (C) 2006 David Gibson, IBM Corporation.
+ *
+ *     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.
+ */
+#ifndef _FDT_H
+#define _FDT_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef __ASSEMBLY__
+
+#include "libfdt_env.h"
+
+struct fdt_header {
+        fdt32_t magic;			 /* magic word FDT_MAGIC */
+        fdt32_t totalsize;		 /* total size of DT block */
+        fdt32_t off_dt_struct;		 /* offset to structure */
+        fdt32_t off_dt_strings;		 /* offset to strings */
+        fdt32_t off_mem_rsvmap;		 /* offset to memory reserve map */
+        fdt32_t version;		 /* format version */
+        fdt32_t last_comp_version;	 /* last compatible version */
+
+        /* version 2 fields below */
+        fdt32_t boot_cpuid_phys;	 /* Which physical CPU id we're
+                                            booting on */
+        /* version 3 fields below */
+        fdt32_t size_dt_strings;	 /* size of the strings block */
+
+        /* version 17 fields below */
+        fdt32_t size_dt_struct;		 /* size of the structure block */
+};
+
+struct fdt_reserve_entry {
+        fdt64_t address;
+        fdt64_t size;
+};
+
+struct fdt_node_header {
+        fdt32_t tag;
+        char name[0];
+};
+
+struct fdt_property {
+        fdt32_t tag;
+        fdt32_t len;
+        fdt32_t nameoff;
+        char data[0];
+};
+
+#endif /* !__ASSEMBLY */
+
+#define FDT_MAGIC	0xd00dfeed	/* 4: version, 4: total size */
+#define FDT_TAGSIZE	sizeof(fdt32_t)
+
+#define FDT_BEGIN_NODE	0x1		/* Start node: full name */
+#define FDT_END_NODE	0x2		/* End node */
+#define FDT_PROP	0x3		/* Property: name off,
+                                           size, content */
+#define FDT_NOP		0x4		/* nop */
+#define FDT_END		0x9
+
+#define FDT_V1_SIZE	(7*sizeof(fdt32_t))
+#define FDT_V2_SIZE	(FDT_V1_SIZE + sizeof(fdt32_t))
+#define FDT_V3_SIZE	(FDT_V2_SIZE + sizeof(fdt32_t))
+#define FDT_V16_SIZE	FDT_V3_SIZE
+#define FDT_V17_SIZE	(FDT_V16_SIZE + sizeof(fdt32_t))
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _FDT_H */
diff --git a/ext/libfdt/fdt_empty_tree.c b/ext/libfdt/fdt_empty_tree.c
new file mode 100644
index 000000000..355863df6
--- /dev/null
+++ b/ext/libfdt/fdt_empty_tree.c
@@ -0,0 +1,63 @@
+/*
+ * libfdt - Flat Device Tree manipulation
+ * Copyright (C) 2012 David Gibson, IBM Corporation.
+ *
+ *     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.
+ */
+#include <fdt.h>
+#include <libfdt.h>
+
+#include "libfdt_env.h"
+#include "libfdt_internal.h"
+
+int fdt_create_empty_tree(void *buf, int bufsize)
+{
+        int err;
+
+        err = fdt_create(buf, bufsize);
+        if (err)
+                return err;
+
+        err = fdt_finish_reservemap(buf);
+        if (err)
+                return err;
+
+        err = fdt_begin_node(buf, "");
+        if (err)
+                return err;
+
+        err =  fdt_end_node(buf);
+        if (err)
+                return err;
+
+        err = fdt_finish(buf);
+        if (err)
+                return err;
+
+        return fdt_open_into(buf, buf, bufsize);
+}
+
diff --git a/ext/libfdt/fdt_ro.c b/ext/libfdt/fdt_ro.c
new file mode 100644
index 000000000..de7a4d68f
--- /dev/null
+++ b/ext/libfdt/fdt_ro.c
@@ -0,0 +1,553 @@
+/*
+ * libfdt - Flat Device Tree manipulation
+ * Copyright (C) 2006 David Gibson, IBM Corporation.
+ *
+ *     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.
+ */
+#include <fdt.h>
+#include <libfdt.h>
+
+#include "libfdt_env.h"
+#include "libfdt_internal.h"
+
+static int _fdt_nodename_eq(const void *fdt, int offset,
+                            const char *s, int len)
+{
+        const char *p = fdt_offset_ptr(fdt, offset + FDT_TAGSIZE, len+1);
+
+        if (! p)
+                /* short match */
+                return 0;
+
+        if (memcmp(p, s, len) != 0)
+                return 0;
+
+        if (p[len] == '\0')
+                return 1;
+        else if (!memchr(s, '@', len) && (p[len] == '@'))
+                return 1;
+        else
+                return 0;
+}
+
+const char *fdt_string(const void *fdt, int stroffset)
+{
+        return (const char *)fdt + fdt_off_dt_strings(fdt) + stroffset;
+}
+
+static int _fdt_string_eq(const void *fdt, int stroffset,
+                          const char *s, int len)
+{
+        const char *p = fdt_string(fdt, stroffset);
+
+        return (strlen(p) == len) && (memcmp(p, s, len) == 0);
+}
+
+int fdt_get_mem_rsv(const void *fdt, int n, uint64_t *address, uint64_t *size)
+{
+        FDT_CHECK_HEADER(fdt);
+        *address = fdt64_to_cpu(_fdt_mem_rsv(fdt, n)->address);
+        *size = fdt64_to_cpu(_fdt_mem_rsv(fdt, n)->size);
+        return 0;
+}
+
+int fdt_num_mem_rsv(const void *fdt)
+{
+        int i = 0;
+
+        while (fdt64_to_cpu(_fdt_mem_rsv(fdt, i)->size) != 0)
+                i++;
+        return i;
+}
+
+static int _nextprop(const void *fdt, int offset)
+{
+        uint32_t tag;
+        int nextoffset;
+
+        do {
+                tag = fdt_next_tag(fdt, offset, &nextoffset);
+
+                switch (tag) {
+                case FDT_END:
+                        if (nextoffset >= 0)
+                                return -FDT_ERR_BADSTRUCTURE;
+                        else
+                                return nextoffset;
+
+                case FDT_PROP:
+                        return offset;
+                }
+                offset = nextoffset;
+        } while (tag == FDT_NOP);
+
+        return -FDT_ERR_NOTFOUND;
+}
+
+int fdt_subnode_offset_namelen(const void *fdt, int offset,
+                               const char *name, int namelen)
+{
+        int depth;
+
+        FDT_CHECK_HEADER(fdt);
+
+        for (depth = 0;
+             (offset >= 0) && (depth >= 0);
+             offset = fdt_next_node(fdt, offset, &depth))
+                if ((depth == 1)
+                    && _fdt_nodename_eq(fdt, offset, name, namelen))
+                        return offset;
+
+        if (depth < 0)
+                return -FDT_ERR_NOTFOUND;
+        return offset; /* error */
+}
+
+int fdt_subnode_offset(const void *fdt, int parentoffset,
+                       const char *name)
+{
+        return fdt_subnode_offset_namelen(fdt, parentoffset, name, strlen(name));
+}
+
+int fdt_path_offset(const void *fdt, const char *path)
+{
+        const char *end = path + strlen(path);
+        const char *p = path;
+        int offset = 0;
+
+        FDT_CHECK_HEADER(fdt);
+
+        /* see if we have an alias */
+        if (*path != '/') {
+                const char *q = strchr(path, '/');
+
+                if (!q)
+                        q = end;
+
+                p = fdt_get_alias_namelen(fdt, p, q - p);
+                if (!p)
+                        return -FDT_ERR_BADPATH;
+                offset = fdt_path_offset(fdt, p);
+
+                p = q;
+        }
+
+        while (*p) {
+                const char *q;
+
+                while (*p == '/')
+                        p++;
+                if (! *p)
+                        return offset;
+                q = strchr(p, '/');
+                if (! q)
+                        q = end;
+
+                offset = fdt_subnode_offset_namelen(fdt, offset, p, q-p);
+                if (offset < 0)
+                        return offset;
+
+                p = q;
+        }
+
+        return offset;
+}
+
+const char *fdt_get_name(const void *fdt, int nodeoffset, int *len)
+{
+        const struct fdt_node_header *nh = _fdt_offset_ptr(fdt, nodeoffset);
+        int err;
+
+        if (((err = fdt_check_header(fdt)) != 0)
+            || ((err = _fdt_check_node_offset(fdt, nodeoffset)) < 0))
+                        goto fail;
+
+        if (len)
+                *len = strlen(nh->name);
+
+        return nh->name;
+
+ fail:
+        if (len)
+                *len = err;
+        return NULL;
+}
+
+int fdt_first_property_offset(const void *fdt, int nodeoffset)
+{
+        int offset;
+
+        if ((offset = _fdt_check_node_offset(fdt, nodeoffset)) < 0)
+                return offset;
+
+        return _nextprop(fdt, offset);
+}
+
+int fdt_next_property_offset(const void *fdt, int offset)
+{
+        if ((offset = _fdt_check_prop_offset(fdt, offset)) < 0)
+                return offset;
+
+        return _nextprop(fdt, offset);
+}
+
+const struct fdt_property *fdt_get_property_by_offset(const void *fdt,
+                                                      int offset,
+                                                      int *lenp)
+{
+        int err;
+        const struct fdt_property *prop;
+
+        if ((err = _fdt_check_prop_offset(fdt, offset)) < 0) {
+                if (lenp)
+                        *lenp = err;
+                return NULL;
+        }
+
+        prop = _fdt_offset_ptr(fdt, offset);
+
+        if (lenp)
+                *lenp = fdt32_to_cpu(prop->len);
+
+        return prop;
+}
+
+const struct fdt_property *fdt_get_property_namelen(const void *fdt,
+                                                    int offset,
+                                                    const char *name,
+                                                    int namelen, int *lenp)
+{
+        for (offset = fdt_first_property_offset(fdt, offset);
+             (offset >= 0);
+             (offset = fdt_next_property_offset(fdt, offset))) {
+                const struct fdt_property *prop;
+
+                if (!(prop = fdt_get_property_by_offset(fdt, offset, lenp))) {
+                        offset = -FDT_ERR_INTERNAL;
+                        break;
+                }
+                if (_fdt_string_eq(fdt, fdt32_to_cpu(prop->nameoff),
+                                   name, namelen))
+                        return prop;
+        }
+
+        if (lenp)
+                *lenp = offset;
+        return NULL;
+}
+
+const struct fdt_property *fdt_get_property(const void *fdt,
+                                            int nodeoffset,
+                                            const char *name, int *lenp)
+{
+        return fdt_get_property_namelen(fdt, nodeoffset, name,
+                                        strlen(name), lenp);
+}
+
+const void *fdt_getprop_namelen(const void *fdt, int nodeoffset,
+                                const char *name, int namelen, int *lenp)
+{
+        const struct fdt_property *prop;
+
+        prop = fdt_get_property_namelen(fdt, nodeoffset, name, namelen, lenp);
+        if (! prop)
+                return NULL;
+
+        return prop->data;
+}
+
+const void *fdt_getprop_by_offset(const void *fdt, int offset,
+                                  const char **namep, int *lenp)
+{
+        const struct fdt_property *prop;
+
+        prop = fdt_get_property_by_offset(fdt, offset, lenp);
+        if (!prop)
+                return NULL;
+        if (namep)
+                *namep = fdt_string(fdt, fdt32_to_cpu(prop->nameoff));
+        return prop->data;
+}
+
+const void *fdt_getprop(const void *fdt, int nodeoffset,
+                        const char *name, int *lenp)
+{
+        return fdt_getprop_namelen(fdt, nodeoffset, name, strlen(name), lenp);
+}
+
+uint32_t fdt_get_phandle(const void *fdt, int nodeoffset)
+{
+        const fdt32_t *php;
+        int len;
+
+        /* FIXME: This is a bit sub-optimal, since we potentially scan
+         * over all the properties twice. */
+        php = fdt_getprop(fdt, nodeoffset, "phandle", &len);
+        if (!php || (len != sizeof(*php))) {
+                php = fdt_getprop(fdt, nodeoffset, "linux,phandle", &len);
+                if (!php || (len != sizeof(*php)))
+                        return 0;
+        }
+
+        return fdt32_to_cpu(*php);
+}
+
+const char *fdt_get_alias_namelen(const void *fdt,
+                                  const char *name, int namelen)
+{
+        int aliasoffset;
+
+        aliasoffset = fdt_path_offset(fdt, "/aliases");
+        if (aliasoffset < 0)
+                return NULL;
+
+        return fdt_getprop_namelen(fdt, aliasoffset, name, namelen, NULL);
+}
+
+const char *fdt_get_alias(const void *fdt, const char *name)
+{
+        return fdt_get_alias_namelen(fdt, name, strlen(name));
+}
+
+int fdt_get_path(const void *fdt, int nodeoffset, char *buf, int buflen)
+{
+        int pdepth = 0, p = 0;
+        int offset, depth, namelen;
+        const char *name;
+
+        FDT_CHECK_HEADER(fdt);
+
+        if (buflen < 2)
+                return -FDT_ERR_NOSPACE;
+
+        for (offset = 0, depth = 0;
+             (offset >= 0) && (offset <= nodeoffset);
+             offset = fdt_next_node(fdt, offset, &depth)) {
+                while (pdepth > depth) {
+                        do {
+                                p--;
+                        } while (buf[p-1] != '/');
+                        pdepth--;
+                }
+
+                if (pdepth >= depth) {
+                        name = fdt_get_name(fdt, offset, &namelen);
+                        if (!name)
+                                return namelen;
+                        if ((p + namelen + 1) <= buflen) {
+                                memcpy(buf + p, name, namelen);
+                                p += namelen;
+                                buf[p++] = '/';
+                                pdepth++;
+                        }
+                }
+
+                if (offset == nodeoffset) {
+                        if (pdepth < (depth + 1))
+                                return -FDT_ERR_NOSPACE;
+
+                        if (p > 1) /* special case so that root path is "/", not "" */
+                                p--;
+                        buf[p] = '\0';
+                        return 0;
+                }
+        }
+
+        if ((offset == -FDT_ERR_NOTFOUND) || (offset >= 0))
+                return -FDT_ERR_BADOFFSET;
+        else if (offset == -FDT_ERR_BADOFFSET)
+                return -FDT_ERR_BADSTRUCTURE;
+
+        return offset; /* error from fdt_next_node() */
+}
+
+int fdt_supernode_atdepth_offset(const void *fdt, int nodeoffset,
+                                 int supernodedepth, int *nodedepth)
+{
+        int offset, depth;
+        int supernodeoffset = -FDT_ERR_INTERNAL;
+
+        FDT_CHECK_HEADER(fdt);
+
+        if (supernodedepth < 0)
+                return -FDT_ERR_NOTFOUND;
+
+        for (offset = 0, depth = 0;
+             (offset >= 0) && (offset <= nodeoffset);
+             offset = fdt_next_node(fdt, offset, &depth)) {
+                if (depth == supernodedepth)
+                        supernodeoffset = offset;
+
+                if (offset == nodeoffset) {
+                        if (nodedepth)
+                                *nodedepth = depth;
+
+                        if (supernodedepth > depth)
+                                return -FDT_ERR_NOTFOUND;
+                        else
+                                return supernodeoffset;
+                }
+        }
+
+        if ((offset == -FDT_ERR_NOTFOUND) || (offset >= 0))
+                return -FDT_ERR_BADOFFSET;
+        else if (offset == -FDT_ERR_BADOFFSET)
+                return -FDT_ERR_BADSTRUCTURE;
+
+        return offset; /* error from fdt_next_node() */
+}
+
+int fdt_node_depth(const void *fdt, int nodeoffset)
+{
+        int nodedepth;
+        int err;
+
+        err = fdt_supernode_atdepth_offset(fdt, nodeoffset, 0, &nodedepth);
+        if (err)
+                return (err < 0) ? err : -FDT_ERR_INTERNAL;
+        return nodedepth;
+}
+
+int fdt_parent_offset(const void *fdt, int nodeoffset)
+{
+        int nodedepth = fdt_node_depth(fdt, nodeoffset);
+
+        if (nodedepth < 0)
+                return nodedepth;
+        return fdt_supernode_atdepth_offset(fdt, nodeoffset,
+                                            nodedepth - 1, NULL);
+}
+
+int fdt_node_offset_by_prop_value(const void *fdt, int startoffset,
+                                  const char *propname,
+                                  const void *propval, int proplen)
+{
+        int offset;
+        const void *val;
+        int len;
+
+        FDT_CHECK_HEADER(fdt);
+
+        /* FIXME: The algorithm here is pretty horrible: we scan each
+         * property of a node in fdt_getprop(), then if that didn't
+         * find what we want, we scan over them again making our way
+         * to the next node.  Still it's the easiest to implement
+         * approach; performance can come later. */
+        for (offset = fdt_next_node(fdt, startoffset, NULL);
+             offset >= 0;
+             offset = fdt_next_node(fdt, offset, NULL)) {
+                val = fdt_getprop(fdt, offset, propname, &len);
+                if (val && (len == proplen)
+                    && (memcmp(val, propval, len) == 0))
+                        return offset;
+        }
+
+        return offset; /* error from fdt_next_node() */
+}
+
+int fdt_node_offset_by_phandle(const void *fdt, uint32_t phandle)
+{
+        int offset;
+
+        if ((phandle == 0) || (phandle == -1))
+                return -FDT_ERR_BADPHANDLE;
+
+        FDT_CHECK_HEADER(fdt);
+
+        /* FIXME: The algorithm here is pretty horrible: we
+         * potentially scan each property of a node in
+         * fdt_get_phandle(), then if that didn't find what
+         * we want, we scan over them again making our way to the next
+         * node.  Still it's the easiest to implement approach;
+         * performance can come later. */
+        for (offset = fdt_next_node(fdt, -1, NULL);
+             offset >= 0;
+             offset = fdt_next_node(fdt, offset, NULL)) {
+                if (fdt_get_phandle(fdt, offset) == phandle)
+                        return offset;
+        }
+
+        return offset; /* error from fdt_next_node() */
+}
+
+static int _fdt_stringlist_contains(const char *strlist, int listlen,
+                                    const char *str)
+{
+        int len = strlen(str);
+        const char *p;
+
+        while (listlen >= len) {
+                if (memcmp(str, strlist, len+1) == 0)
+                        return 1;
+                p = memchr(strlist, '\0', listlen);
+                if (!p)
+                        return 0; /* malformed strlist.. */
+                listlen -= (p-strlist) + 1;
+                strlist = p + 1;
+        }
+        return 0;
+}
+
+int fdt_node_check_compatible(const void *fdt, int nodeoffset,
+                              const char *compatible)
+{
+        const void *prop;
+        int len;
+
+        prop = fdt_getprop(fdt, nodeoffset, "compatible", &len);
+        if (!prop)
+                return len;
+        if (_fdt_stringlist_contains(prop, len, compatible))
+                return 0;
+        else
+                return 1;
+}
+
+int fdt_node_offset_by_compatible(const void *fdt, int startoffset,
+                                  const char *compatible)
+{
+        int offset, err;
+
+        FDT_CHECK_HEADER(fdt);
+
+        /* FIXME: The algorithm here is pretty horrible: we scan each
+         * property of a node in fdt_node_check_compatible(), then if
+         * that didn't find what we want, we scan over them again
+         * making our way to the next node.  Still it's the easiest to
+         * implement approach; performance can come later. */
+        for (offset = fdt_next_node(fdt, startoffset, NULL);
+             offset >= 0;
+             offset = fdt_next_node(fdt, offset, NULL)) {
+                err = fdt_node_check_compatible(fdt, offset, compatible);
+                if ((err < 0) && (err != -FDT_ERR_NOTFOUND))
+                        return err;
+                else if (err == 0)
+                        return offset;
+        }
+
+        return offset; /* error from fdt_next_node() */
+}
diff --git a/ext/libfdt/fdt_rw.c b/ext/libfdt/fdt_rw.c
new file mode 100644
index 000000000..179164d37
--- /dev/null
+++ b/ext/libfdt/fdt_rw.c
@@ -0,0 +1,471 @@
+/*
+ * libfdt - Flat Device Tree manipulation
+ * Copyright (C) 2006 David Gibson, IBM Corporation.
+ *
+ *     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.
+ */
+#include <fdt.h>
+#include <libfdt.h>
+
+#include "libfdt_env.h"
+#include "libfdt_internal.h"
+
+static int _fdt_blocks_misordered(const void *fdt,
+                              int mem_rsv_size, int struct_size)
+{
+        return (fdt_off_mem_rsvmap(fdt) < FDT_ALIGN(sizeof(struct fdt_header), 8))
+                || (fdt_off_dt_struct(fdt) <
+                    (fdt_off_mem_rsvmap(fdt) + mem_rsv_size))
+                || (fdt_off_dt_strings(fdt) <
+                    (fdt_off_dt_struct(fdt) + struct_size))
+                || (fdt_totalsize(fdt) <
+                    (fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt)));
+}
+
+static int _fdt_rw_check_header(void *fdt)
+{
+        FDT_CHECK_HEADER(fdt);
+
+        if (fdt_version(fdt) < 17)
+                return -FDT_ERR_BADVERSION;
+        if (_fdt_blocks_misordered(fdt, sizeof(struct fdt_reserve_entry),
+                                   fdt_size_dt_struct(fdt)))
+                return -FDT_ERR_BADLAYOUT;
+        if (fdt_version(fdt) > 17)
+                fdt_set_version(fdt, 17);
+
+        return 0;
+}
+
+#define FDT_RW_CHECK_HEADER(fdt) \
+        { \
+                int err; \
+                if ((err = _fdt_rw_check_header(fdt)) != 0) \
+                        return err; \
+        }
+
+static inline int _fdt_data_size(void *fdt)
+{
+        return fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt);
+}
+
+static int _fdt_splice(void *fdt, void *splicepoint, int oldlen, int newlen)
+{
+        char *p = splicepoint;
+        char *end = (char *)fdt + _fdt_data_size(fdt);
+
+        if (((p + oldlen) < p) || ((p + oldlen) > end))
+                return -FDT_ERR_BADOFFSET;
+        if ((end - oldlen + newlen) > ((char *)fdt + fdt_totalsize(fdt)))
+                return -FDT_ERR_NOSPACE;
+        memmove(p + newlen, p + oldlen, end - p - oldlen);
+        return 0;
+}
+
+static int _fdt_splice_mem_rsv(void *fdt, struct fdt_reserve_entry *p,
+                               int oldn, int newn)
+{
+        int delta = (newn - oldn) * sizeof(*p);
+        int err;
+        err = _fdt_splice(fdt, p, oldn * sizeof(*p), newn * sizeof(*p));
+        if (err)
+                return err;
+        fdt_set_off_dt_struct(fdt, fdt_off_dt_struct(fdt) + delta);
+        fdt_set_off_dt_strings(fdt, fdt_off_dt_strings(fdt) + delta);
+        return 0;
+}
+
+static int _fdt_splice_struct(void *fdt, void *p,
+                              int oldlen, int newlen)
+{
+        int delta = newlen - oldlen;
+        int err;
+
+        if ((err = _fdt_splice(fdt, p, oldlen, newlen)))
+                return err;
+
+        fdt_set_size_dt_struct(fdt, fdt_size_dt_struct(fdt) + delta);
+        fdt_set_off_dt_strings(fdt, fdt_off_dt_strings(fdt) + delta);
+        return 0;
+}
+
+static int _fdt_splice_string(void *fdt, int newlen)
+{
+        void *p = (char *)fdt
+                + fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt);
+        int err;
+
+        if ((err = _fdt_splice(fdt, p, 0, newlen)))
+                return err;
+
+        fdt_set_size_dt_strings(fdt, fdt_size_dt_strings(fdt) + newlen);
+        return 0;
+}
+
+static int _fdt_find_add_string(void *fdt, const char *s)
+{
+        char *strtab = (char *)fdt + fdt_off_dt_strings(fdt);
+        const char *p;
+        char *new;
+        int len = strlen(s) + 1;
+        int err;
+
+        p = _fdt_find_string(strtab, fdt_size_dt_strings(fdt), s);
+        if (p)
+                /* found it */
+                return (p - strtab);
+
+        new = strtab + fdt_size_dt_strings(fdt);
+        err = _fdt_splice_string(fdt, len);
+        if (err)
+                return err;
+
+        memcpy(new, s, len);
+        return (new - strtab);
+}
+
+int fdt_add_mem_rsv(void *fdt, uint64_t address, uint64_t size)
+{
+        struct fdt_reserve_entry *re;
+        int err;
+
+        FDT_RW_CHECK_HEADER(fdt);
+
+        re = _fdt_mem_rsv_w(fdt, fdt_num_mem_rsv(fdt));
+        err = _fdt_splice_mem_rsv(fdt, re, 0, 1);
+        if (err)
+                return err;
+
+        re->address = cpu_to_fdt64(address);
+        re->size = cpu_to_fdt64(size);
+        return 0;
+}
+
+int fdt_del_mem_rsv(void *fdt, int n)
+{
+        struct fdt_reserve_entry *re = _fdt_mem_rsv_w(fdt, n);
+        int err;
+
+        FDT_RW_CHECK_HEADER(fdt);
+
+        if (n >= fdt_num_mem_rsv(fdt))
+                return -FDT_ERR_NOTFOUND;
+
+        err = _fdt_splice_mem_rsv(fdt, re, 1, 0);
+        if (err)
+                return err;
+        return 0;
+}
+
+static int _fdt_resize_property(void *fdt, int nodeoffset, const char *name,
+                                int len, struct fdt_property **prop)
+{
+        int oldlen;
+        int err;
+
+        *prop = fdt_get_property_w(fdt, nodeoffset, name, &oldlen);
+        if (! (*prop))
+                return oldlen;
+
+        if ((err = _fdt_splice_struct(fdt, (*prop)->data, FDT_TAGALIGN(oldlen),
+                                      FDT_TAGALIGN(len))))
+                return err;
+
+        (*prop)->len = cpu_to_fdt32(len);
+        return 0;
+}
+
+static int _fdt_add_property(void *fdt, int nodeoffset, const char *name,
+                             int len, struct fdt_property **prop)
+{
+        int proplen;
+        int nextoffset;
+        int namestroff;
+        int err;
+
+        if ((nextoffset = _fdt_check_node_offset(fdt, nodeoffset)) < 0)
+                return nextoffset;
+
+        namestroff = _fdt_find_add_string(fdt, name);
+        if (namestroff < 0)
+                return namestroff;
+
+        *prop = _fdt_offset_ptr_w(fdt, nextoffset);
+        proplen = sizeof(**prop) + FDT_TAGALIGN(len);
+
+        err = _fdt_splice_struct(fdt, *prop, 0, proplen);
+        if (err)
+                return err;
+
+        (*prop)->tag = cpu_to_fdt32(FDT_PROP);
+        (*prop)->nameoff = cpu_to_fdt32(namestroff);
+        (*prop)->len = cpu_to_fdt32(len);
+        return 0;
+}
+
+int fdt_set_name(void *fdt, int nodeoffset, const char *name)
+{
+        char *namep;
+        int oldlen, newlen;
+        int err;
+
+        FDT_RW_CHECK_HEADER(fdt);
+
+        namep = (char *)(uintptr_t)fdt_get_name(fdt, nodeoffset, &oldlen);
+        if (!namep)
+                return oldlen;
+
+        newlen = strlen(name);
+
+        err = _fdt_splice_struct(fdt, namep, FDT_TAGALIGN(oldlen+1),
+                                 FDT_TAGALIGN(newlen+1));
+        if (err)
+                return err;
+
+        memcpy(namep, name, newlen+1);
+        return 0;
+}
+
+int fdt_setprop(void *fdt, int nodeoffset, const char *name,
+                const void *val, int len)
+{
+        struct fdt_property *prop;
+        int err;
+
+        FDT_RW_CHECK_HEADER(fdt);
+
+        err = _fdt_resize_property(fdt, nodeoffset, name, len, &prop);
+        if (err == -FDT_ERR_NOTFOUND)
+                err = _fdt_add_property(fdt, nodeoffset, name, len, &prop);
+        if (err)
+                return err;
+
+        memcpy(prop->data, val, len);
+        return 0;
+}
+
+int fdt_appendprop(void *fdt, int nodeoffset, const char *name,
+                   const void *val, int len)
+{
+        struct fdt_property *prop;
+        int err, oldlen, newlen;
+
+        FDT_RW_CHECK_HEADER(fdt);
+
+        prop = fdt_get_property_w(fdt, nodeoffset, name, &oldlen);
+        if (prop) {
+                newlen = len + oldlen;
+                err = _fdt_splice_struct(fdt, prop->data,
+                                         FDT_TAGALIGN(oldlen),
+                                         FDT_TAGALIGN(newlen));
+                if (err)
+                        return err;
+                prop->len = cpu_to_fdt32(newlen);
+                memcpy(prop->data + oldlen, val, len);
+        } else {
+                err = _fdt_add_property(fdt, nodeoffset, name, len, &prop);
+                if (err)
+                        return err;
+                memcpy(prop->data, val, len);
+        }
+        return 0;
+}
+
+int fdt_delprop(void *fdt, int nodeoffset, const char *name)
+{
+        struct fdt_property *prop;
+        int len, proplen;
+
+        FDT_RW_CHECK_HEADER(fdt);
+
+        prop = fdt_get_property_w(fdt, nodeoffset, name, &len);
+        if (! prop)
+                return len;
+
+        proplen = sizeof(*prop) + FDT_TAGALIGN(len);
+        return _fdt_splice_struct(fdt, prop, proplen, 0);
+}
+
+int fdt_add_subnode_namelen(void *fdt, int parentoffset,
+                            const char *name, int namelen)
+{
+        struct fdt_node_header *nh;
+        int offset, nextoffset;
+        int nodelen;
+        int err;
+        uint32_t tag;
+        fdt32_t *endtag;
+
+        FDT_RW_CHECK_HEADER(fdt);
+
+        offset = fdt_subnode_offset_namelen(fdt, parentoffset, name, namelen);
+        if (offset >= 0)
+                return -FDT_ERR_EXISTS;
+        else if (offset != -FDT_ERR_NOTFOUND)
+                return offset;
+
+        /* Try to place the new node after the parent's properties */
+        fdt_next_tag(fdt, parentoffset, &nextoffset); /* skip the BEGIN_NODE */
+        do {
+                offset = nextoffset;
+                tag = fdt_next_tag(fdt, offset, &nextoffset);
+        } while ((tag == FDT_PROP) || (tag == FDT_NOP));
+
+        nh = _fdt_offset_ptr_w(fdt, offset);
+        nodelen = sizeof(*nh) + FDT_TAGALIGN(namelen+1) + FDT_TAGSIZE;
+
+        err = _fdt_splice_struct(fdt, nh, 0, nodelen);
+        if (err)
+                return err;
+
+        nh->tag = cpu_to_fdt32(FDT_BEGIN_NODE);
+        memset(nh->name, 0, FDT_TAGALIGN(namelen+1));
+        memcpy(nh->name, name, namelen);
+        endtag = (fdt32_t *)((char *)nh + nodelen - FDT_TAGSIZE);
+        *endtag = cpu_to_fdt32(FDT_END_NODE);
+
+        return offset;
+}
+
+int fdt_add_subnode(void *fdt, int parentoffset, const char *name)
+{
+        return fdt_add_subnode_namelen(fdt, parentoffset, name, strlen(name));
+}
+
+int fdt_del_node(void *fdt, int nodeoffset)
+{
+        int endoffset;
+
+        FDT_RW_CHECK_HEADER(fdt);
+
+        endoffset = _fdt_node_end_offset(fdt, nodeoffset);
+        if (endoffset < 0)
+                return endoffset;
+
+        return _fdt_splice_struct(fdt, _fdt_offset_ptr_w(fdt, nodeoffset),
+                                  endoffset - nodeoffset, 0);
+}
+
+static void _fdt_packblocks(const char *old, char *new,
+                            int mem_rsv_size, int struct_size)
+{
+        int mem_rsv_off, struct_off, strings_off;
+
+        mem_rsv_off = FDT_ALIGN(sizeof(struct fdt_header), 8);
+        struct_off = mem_rsv_off + mem_rsv_size;
+        strings_off = struct_off + struct_size;
+
+        memmove(new + mem_rsv_off, old + fdt_off_mem_rsvmap(old), mem_rsv_size);
+        fdt_set_off_mem_rsvmap(new, mem_rsv_off);
+
+        memmove(new + struct_off, old + fdt_off_dt_struct(old), struct_size);
+        fdt_set_off_dt_struct(new, struct_off);
+        fdt_set_size_dt_struct(new, struct_size);
+
+        memmove(new + strings_off, old + fdt_off_dt_strings(old),
+                fdt_size_dt_strings(old));
+        fdt_set_off_dt_strings(new, strings_off);
+        fdt_set_size_dt_strings(new, fdt_size_dt_strings(old));
+}
+
+int fdt_open_into(const void *fdt, void *buf, int bufsize)
+{
+        int err;
+        int mem_rsv_size, struct_size;
+        int newsize;
+        const char *fdtstart = fdt;
+        const char *fdtend = fdtstart + fdt_totalsize(fdt);
+        char *tmp;
+
+        FDT_CHECK_HEADER(fdt);
+
+        mem_rsv_size = (fdt_num_mem_rsv(fdt)+1)
+                * sizeof(struct fdt_reserve_entry);
+
+        if (fdt_version(fdt) >= 17) {
+                struct_size = fdt_size_dt_struct(fdt);
+        } else {
+                struct_size = 0;
+                while (fdt_next_tag(fdt, struct_size, &struct_size) != FDT_END)
+                        ;
+                if (struct_size < 0)
+                        return struct_size;
+        }
+
+        if (!_fdt_blocks_misordered(fdt, mem_rsv_size, struct_size)) {
+                /* no further work necessary */
+                err = fdt_move(fdt, buf, bufsize);
+                if (err)
+                        return err;
+                fdt_set_version(buf, 17);
+                fdt_set_size_dt_struct(buf, struct_size);
+                fdt_set_totalsize(buf, bufsize);
+                return 0;
+        }
+
+        /* Need to reorder */
+        newsize = FDT_ALIGN(sizeof(struct fdt_header), 8) + mem_rsv_size
+                + struct_size + fdt_size_dt_strings(fdt);
+
+        if (bufsize < newsize)
+                return -FDT_ERR_NOSPACE;
+
+        /* First attempt to build converted tree at beginning of buffer */
+        tmp = buf;
+        /* But if that overlaps with the old tree... */
+        if (((tmp + newsize) > fdtstart) && (tmp < fdtend)) {
+                /* Try right after the old tree instead */
+                tmp = (char *)(uintptr_t)fdtend;
+                if ((tmp + newsize) > ((char *)buf + bufsize))
+                        return -FDT_ERR_NOSPACE;
+        }
+
+        _fdt_packblocks(fdt, tmp, mem_rsv_size, struct_size);
+        memmove(buf, tmp, newsize);
+
+        fdt_set_magic(buf, FDT_MAGIC);
+        fdt_set_totalsize(buf, bufsize);
+        fdt_set_version(buf, 17);
+        fdt_set_last_comp_version(buf, 16);
+        fdt_set_boot_cpuid_phys(buf, fdt_boot_cpuid_phys(fdt));
+
+        return 0;
+}
+
+int fdt_pack(void *fdt)
+{
+        int mem_rsv_size;
+
+        FDT_RW_CHECK_HEADER(fdt);
+
+        mem_rsv_size = (fdt_num_mem_rsv(fdt)+1)
+                * sizeof(struct fdt_reserve_entry);
+        _fdt_packblocks(fdt, fdt, mem_rsv_size, fdt_size_dt_struct(fdt));
+        fdt_set_totalsize(fdt, _fdt_data_size(fdt));
+
+        return 0;
+}
diff --git a/ext/libfdt/fdt_strerror.c b/ext/libfdt/fdt_strerror.c
new file mode 100644
index 000000000..35cb4f424
--- /dev/null
+++ b/ext/libfdt/fdt_strerror.c
@@ -0,0 +1,75 @@
+/*
+ * libfdt - Flat Device Tree manipulation
+ * Copyright (C) 2006 David Gibson, IBM Corporation.
+ *
+ *     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.
+ */
+#include <fdt.h>
+#include <libfdt.h>
+
+#include "libfdt_env.h"
+#include "libfdt_internal.h"
+
+struct fdt_errtabent {
+        const char *str;
+};
+
+#define FDT_ERRTABENT(val) \
+        [(val)] = { .str = #val, }
+
+static struct fdt_errtabent fdt_errtable[] = {
+        FDT_ERRTABENT(FDT_ERR_NOTFOUND),
+        FDT_ERRTABENT(FDT_ERR_EXISTS),
+        FDT_ERRTABENT(FDT_ERR_NOSPACE),
+
+        FDT_ERRTABENT(FDT_ERR_BADOFFSET),
+        FDT_ERRTABENT(FDT_ERR_BADPATH),
+        FDT_ERRTABENT(FDT_ERR_BADSTATE),
+
+        FDT_ERRTABENT(FDT_ERR_TRUNCATED),
+        FDT_ERRTABENT(FDT_ERR_BADMAGIC),
+        FDT_ERRTABENT(FDT_ERR_BADVERSION),
+        FDT_ERRTABENT(FDT_ERR_BADSTRUCTURE),
+        FDT_ERRTABENT(FDT_ERR_BADLAYOUT),
+};
+#define FDT_ERRTABSIZE	(sizeof(fdt_errtable) / sizeof(fdt_errtable[0]))
+
+const char *fdt_strerror(int errval)
+{
+        if (errval > 0)
+                return "<valid offset/length>";
+        else if (errval == 0)
+                return "<no error>";
+        else if (errval > -FDT_ERRTABSIZE) {
+                const char *s = fdt_errtable[-errval].str;
+
+                if (s)
+                        return s;
+        }
+
+        return "<unknown error>";
+}
diff --git a/ext/libfdt/fdt_sw.c b/ext/libfdt/fdt_sw.c
new file mode 100644
index 000000000..eb4cad654
--- /dev/null
+++ b/ext/libfdt/fdt_sw.c
@@ -0,0 +1,235 @@
+/*
+ * libfdt - Flat Device Tree manipulation
+ * Copyright (C) 2006 David Gibson, IBM Corporation.
+ *
+ *     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.
+ */
+#include <fdt.h>
+#include <libfdt.h>
+
+#include "libfdt_env.h"
+#include "libfdt_internal.h"
+
+static int _fdt_sw_check_header(void *fdt)
+{
+        if (fdt_magic(fdt) != FDT_SW_MAGIC)
+                return -FDT_ERR_BADMAGIC;
+        /* FIXME: should check more details about the header state */
+        return 0;
+}
+
+#define FDT_SW_CHECK_HEADER(fdt) \
+        { \
+                int err; \
+                if ((err = _fdt_sw_check_header(fdt)) != 0) \
+                        return err; \
+        }
+
+static void *_fdt_grab_space(void *fdt, size_t len)
+{
+        int offset = fdt_size_dt_struct(fdt);
+        int spaceleft;
+
+        spaceleft = fdt_totalsize(fdt) - fdt_off_dt_struct(fdt)
+                - fdt_size_dt_strings(fdt);
+
+        if ((offset + len < offset) || (offset + len > spaceleft))
+                return NULL;
+
+        fdt_set_size_dt_struct(fdt, offset + len);
+        return _fdt_offset_ptr_w(fdt, offset);
+}
+
+int fdt_create(void *buf, int bufsize)
+{
+        void *fdt = buf;
+
+        if (bufsize < sizeof(struct fdt_header))
+                return -FDT_ERR_NOSPACE;
+
+        memset(buf, 0, bufsize);
+
+        fdt_set_magic(fdt, FDT_SW_MAGIC);
+        fdt_set_version(fdt, FDT_LAST_SUPPORTED_VERSION);
+        fdt_set_last_comp_version(fdt, FDT_FIRST_SUPPORTED_VERSION);
+        fdt_set_totalsize(fdt,  bufsize);
+
+        fdt_set_off_mem_rsvmap(fdt, FDT_ALIGN(sizeof(struct fdt_header),
+                                              sizeof(struct fdt_reserve_entry)));
+        fdt_set_off_dt_struct(fdt, fdt_off_mem_rsvmap(fdt));
+        fdt_set_off_dt_strings(fdt, bufsize);
+
+        return 0;
+}
+
+int fdt_add_reservemap_entry(void *fdt, uint64_t addr, uint64_t size)
+{
+        struct fdt_reserve_entry *re;
+        int offset;
+
+        FDT_SW_CHECK_HEADER(fdt);
+
+        if (fdt_size_dt_struct(fdt))
+                return -FDT_ERR_BADSTATE;
+
+        offset = fdt_off_dt_struct(fdt);
+        if ((offset + sizeof(*re)) > fdt_totalsize(fdt))
+                return -FDT_ERR_NOSPACE;
+
+        re = (struct fdt_reserve_entry *)((char *)fdt + offset);
+        re->address = cpu_to_fdt64(addr);
+        re->size = cpu_to_fdt64(size);
+
+        fdt_set_off_dt_struct(fdt, offset + sizeof(*re));
+
+        return 0;
+}
+
+int fdt_finish_reservemap(void *fdt)
+{
+        return fdt_add_reservemap_entry(fdt, 0, 0);
+}
+
+int fdt_begin_node(void *fdt, const char *name)
+{
+        struct fdt_node_header *nh;
+        int namelen = strlen(name) + 1;
+
+        FDT_SW_CHECK_HEADER(fdt);
+
+        nh = _fdt_grab_space(fdt, sizeof(*nh) + FDT_TAGALIGN(namelen));
+        if (! nh)
+                return -FDT_ERR_NOSPACE;
+
+        nh->tag = cpu_to_fdt32(FDT_BEGIN_NODE);
+        memcpy(nh->name, name, namelen);
+        return 0;
+}
+
+int fdt_end_node(void *fdt)
+{
+        fdt32_t *en;
+
+        FDT_SW_CHECK_HEADER(fdt);
+
+        en = _fdt_grab_space(fdt, FDT_TAGSIZE);
+        if (! en)
+                return -FDT_ERR_NOSPACE;
+
+        *en = cpu_to_fdt32(FDT_END_NODE);
+        return 0;
+}
+
+static int _fdt_find_add_string(void *fdt, const char *s)
+{
+        char *strtab = (char *)fdt + fdt_totalsize(fdt);
+        const char *p;
+        int strtabsize = fdt_size_dt_strings(fdt);
+        int len = strlen(s) + 1;
+        int struct_top, offset;
+
+        p = _fdt_find_string(strtab - strtabsize, strtabsize, s);
+        if (p)
+                return p - strtab;
+
+        /* Add it */
+        offset = -strtabsize - len;
+        struct_top = fdt_off_dt_struct(fdt) + fdt_size_dt_struct(fdt);
+        if (fdt_totalsize(fdt) + offset < struct_top)
+                return 0; /* no more room :( */
+
+        memcpy(strtab + offset, s, len);
+        fdt_set_size_dt_strings(fdt, strtabsize + len);
+        return offset;
+}
+
+int fdt_property(void *fdt, const char *name, const void *val, int len)
+{
+        struct fdt_property *prop;
+        int nameoff;
+
+        FDT_SW_CHECK_HEADER(fdt);
+
+        nameoff = _fdt_find_add_string(fdt, name);
+        if (nameoff == 0)
+                return -FDT_ERR_NOSPACE;
+
+        prop = _fdt_grab_space(fdt, sizeof(*prop) + FDT_TAGALIGN(len));
+        if (! prop)
+                return -FDT_ERR_NOSPACE;
+
+        prop->tag = cpu_to_fdt32(FDT_PROP);
+        prop->nameoff = cpu_to_fdt32(nameoff);
+        prop->len = cpu_to_fdt32(len);
+        memcpy(prop->data, val, len);
+        return 0;
+}
+
+int fdt_finish(void *fdt)
+{
+        char *p = (char *)fdt;
+        fdt32_t *end;
+        int oldstroffset, newstroffset;
+        uint32_t tag;
+        int offset, nextoffset;
+
+        FDT_SW_CHECK_HEADER(fdt);
+
+        /* Add terminator */
+        end = _fdt_grab_space(fdt, sizeof(*end));
+        if (! end)
+                return -FDT_ERR_NOSPACE;
+        *end = cpu_to_fdt32(FDT_END);
+
+        /* Relocate the string table */
+        oldstroffset = fdt_totalsize(fdt) - fdt_size_dt_strings(fdt);
+        newstroffset = fdt_off_dt_struct(fdt) + fdt_size_dt_struct(fdt);
+        memmove(p + newstroffset, p + oldstroffset, fdt_size_dt_strings(fdt));
+        fdt_set_off_dt_strings(fdt, newstroffset);
+
+        /* Walk the structure, correcting string offsets */
+        offset = 0;
+        while ((tag = fdt_next_tag(fdt, offset, &nextoffset)) != FDT_END) {
+                if (tag == FDT_PROP) {
+                        struct fdt_property *prop =
+                                _fdt_offset_ptr_w(fdt, offset);
+                        int nameoff;
+
+                        nameoff = fdt32_to_cpu(prop->nameoff);
+                        nameoff += fdt_size_dt_strings(fdt);
+                        prop->nameoff = cpu_to_fdt32(nameoff);
+                }
+                offset = nextoffset;
+        }
+        if (nextoffset < 0)
+                return nextoffset;
+
+        /* Finally, adjust the header */
+        fdt_set_totalsize(fdt, newstroffset + fdt_size_dt_strings(fdt));
+        fdt_set_magic(fdt, FDT_MAGIC);
+        return 0;
+}
diff --git a/ext/libfdt/fdt_wip.c b/ext/libfdt/fdt_wip.c
new file mode 100644
index 000000000..19d210e1d
--- /dev/null
+++ b/ext/libfdt/fdt_wip.c
@@ -0,0 +1,97 @@
+/*
+ * libfdt - Flat Device Tree manipulation
+ * Copyright (C) 2006 David Gibson, IBM Corporation.
+ *
+ *     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.
+ */
+#include <fdt.h>
+#include <libfdt.h>
+
+#include "libfdt_env.h"
+#include "libfdt_internal.h"
+
+int fdt_setprop_inplace(void *fdt, int nodeoffset, const char *name,
+                        const void *val, int len)
+{
+        void *propval;
+        int proplen;
+
+        propval = fdt_getprop_w(fdt, nodeoffset, name, &proplen);
+        if (! propval)
+                return proplen;
+
+        if (proplen != len)
+                return -FDT_ERR_NOSPACE;
+
+        memcpy(propval, val, len);
+        return 0;
+}
+
+static void _fdt_nop_region(void *start, int len)
+{
+        fdt32_t *p;
+
+        for (p = start; (char *)p < ((char *)start + len); p++)
+                *p = cpu_to_fdt32(FDT_NOP);
+}
+
+int fdt_nop_property(void *fdt, int nodeoffset, const char *name)
+{
+        struct fdt_property *prop;
+        int len;
+
+        prop = fdt_get_property_w(fdt, nodeoffset, name, &len);
+        if (! prop)
+                return len;
+
+        _fdt_nop_region(prop, len + sizeof(*prop));
+
+        return 0;
+}
+
+int _fdt_node_end_offset(void *fdt, int offset)
+{
+        int depth = 0;
+
+        while ((offset >= 0) && (depth >= 0))
+                offset = fdt_next_node(fdt, offset, &depth);
+
+        return offset;
+}
+
+int fdt_nop_node(void *fdt, int nodeoffset)
+{
+        int endoffset;
+
+        endoffset = _fdt_node_end_offset(fdt, nodeoffset);
+        if (endoffset < 0)
+                return endoffset;
+
+        _fdt_nop_region(fdt_offset_ptr_w(fdt, nodeoffset, 0),
+                        endoffset - nodeoffset);
+        return 0;
+}
diff --git a/ext/libfdt/libfdt.h b/ext/libfdt/libfdt.h
new file mode 100644
index 000000000..8edfa6392
--- /dev/null
+++ b/ext/libfdt/libfdt.h
@@ -0,0 +1,1466 @@
+/*
+ * libfdt - Flat Device Tree manipulation
+ * Copyright (C) 2006 David Gibson, IBM Corporation.
+ *
+ *     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.
+ */
+#ifndef _LIBFDT_H
+#define _LIBFDT_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <fdt.h>
+#include <libfdt_env.h>
+
+#define FDT_FIRST_SUPPORTED_VERSION	0x10
+#define FDT_LAST_SUPPORTED_VERSION	0x11
+
+/* Error codes: informative error codes */
+#define FDT_ERR_NOTFOUND	1
+        /* FDT_ERR_NOTFOUND: The requested node or property does not exist */
+#define FDT_ERR_EXISTS		2
+        /* FDT_ERR_EXISTS: Attemped to create a node or property which
+         * already exists */
+#define FDT_ERR_NOSPACE		3
+        /* FDT_ERR_NOSPACE: Operation needed to expand the device
+         * tree, but its buffer did not have sufficient space to
+         * contain the expanded tree. Use fdt_open_into() to move the
+         * device tree to a buffer with more space. */
+
+/* Error codes: codes for bad parameters */
+#define FDT_ERR_BADOFFSET	4
+        /* FDT_ERR_BADOFFSET: Function was passed a structure block
+         * offset which is out-of-bounds, or which points to an
+         * unsuitable part of the structure for the operation. */
+#define FDT_ERR_BADPATH		5
+        /* FDT_ERR_BADPATH: Function was passed a badly formatted path
+         * (e.g. missing a leading / for a function which requires an
+         * absolute path) */
+#define FDT_ERR_BADPHANDLE	6
+        /* FDT_ERR_BADPHANDLE: Function was passed an invalid phandle
+         * value.  phandle values of 0 and -1 are not permitted. */
+#define FDT_ERR_BADSTATE	7
+        /* FDT_ERR_BADSTATE: Function was passed an incomplete device
+         * tree created by the sequential-write functions, which is
+         * not sufficiently complete for the requested operation. */
+
+/* Error codes: codes for bad device tree blobs */
+#define FDT_ERR_TRUNCATED	8
+        /* FDT_ERR_TRUNCATED: Structure block of the given device tree
+         * ends without an FDT_END tag. */
+#define FDT_ERR_BADMAGIC	9
+        /* FDT_ERR_BADMAGIC: Given "device tree" appears not to be a
+         * device tree at all - it is missing the flattened device
+         * tree magic number. */
+#define FDT_ERR_BADVERSION	10
+        /* FDT_ERR_BADVERSION: Given device tree has a version which
+         * can't be handled by the requested operation.  For
+         * read-write functions, this may mean that fdt_open_into() is
+         * required to convert the tree to the expected version. */
+#define FDT_ERR_BADSTRUCTURE	11
+        /* FDT_ERR_BADSTRUCTURE: Given device tree has a corrupt
+         * structure block or other serious error (e.g. misnested
+         * nodes, or subnodes preceding properties). */
+#define FDT_ERR_BADLAYOUT	12
+        /* FDT_ERR_BADLAYOUT: For read-write functions, the given
+         * device tree has it's sub-blocks in an order that the
+         * function can't handle (memory reserve map, then structure,
+         * then strings).  Use fdt_open_into() to reorganize the tree
+         * into a form suitable for the read-write operations. */
+
+/* "Can't happen" error indicating a bug in libfdt */
+#define FDT_ERR_INTERNAL	13
+        /* FDT_ERR_INTERNAL: libfdt has failed an internal assertion.
+         * Should never be returned, if it is, it indicates a bug in
+         * libfdt itself. */
+
+#define FDT_ERR_MAX		13
+
+/**********************************************************************/
+/* Low-level functions (you probably don't need these)                */
+/**********************************************************************/
+
+const void *fdt_offset_ptr(const void *fdt, int offset, unsigned int checklen);
+static inline void *fdt_offset_ptr_w(void *fdt, int offset, int checklen)
+{
+        return (void *)(uintptr_t)fdt_offset_ptr(fdt, offset, checklen);
+}
+
+uint32_t fdt_next_tag(const void *fdt, int offset, int *nextoffset);
+
+/**********************************************************************/
+/* Traversal functions                                                */
+/**********************************************************************/
+
+int fdt_next_node(const void *fdt, int offset, int *depth);
+
+/**********************************************************************/
+/* General functions                                                  */
+/**********************************************************************/
+
+#define fdt_get_header(fdt, field) \
+        (fdt32_to_cpu(((const struct fdt_header *)(fdt))->field))
+#define fdt_magic(fdt) 			(fdt_get_header(fdt, magic))
+#define fdt_totalsize(fdt)		(fdt_get_header(fdt, totalsize))
+#define fdt_off_dt_struct(fdt)		(fdt_get_header(fdt, off_dt_struct))
+#define fdt_off_dt_strings(fdt)		(fdt_get_header(fdt, off_dt_strings))
+#define fdt_off_mem_rsvmap(fdt)		(fdt_get_header(fdt, off_mem_rsvmap))
+#define fdt_version(fdt)		(fdt_get_header(fdt, version))
+#define fdt_last_comp_version(fdt) 	(fdt_get_header(fdt, last_comp_version))
+#define fdt_boot_cpuid_phys(fdt) 	(fdt_get_header(fdt, boot_cpuid_phys))
+#define fdt_size_dt_strings(fdt) 	(fdt_get_header(fdt, size_dt_strings))
+#define fdt_size_dt_struct(fdt)		(fdt_get_header(fdt, size_dt_struct))
+
+#define __fdt_set_hdr(name) \
+        static inline void fdt_set_##name(void *fdt, uint32_t val) \
+        { \
+                struct fdt_header *fdth = (struct fdt_header*)fdt; \
+                fdth->name = cpu_to_fdt32(val); \
+        }
+__fdt_set_hdr(magic);
+__fdt_set_hdr(totalsize);
+__fdt_set_hdr(off_dt_struct);
+__fdt_set_hdr(off_dt_strings);
+__fdt_set_hdr(off_mem_rsvmap);
+__fdt_set_hdr(version);
+__fdt_set_hdr(last_comp_version);
+__fdt_set_hdr(boot_cpuid_phys);
+__fdt_set_hdr(size_dt_strings);
+__fdt_set_hdr(size_dt_struct);
+#undef __fdt_set_hdr
+
+/**
+ * fdt_check_header - sanity check a device tree or possible device tree
+ * @fdt: pointer to data which might be a flattened device tree
+ *
+ * fdt_check_header() checks that the given buffer contains what
+ * appears to be a flattened device tree with sane information in its
+ * header.
+ *
+ * returns:
+ *     0, if the buffer appears to contain a valid device tree
+ *     -FDT_ERR_BADMAGIC,
+ *     -FDT_ERR_BADVERSION,
+ *     -FDT_ERR_BADSTATE, standard meanings, as above
+ */
+int fdt_check_header(const void *fdt);
+
+/**
+ * fdt_move - move a device tree around in memory
+ * @fdt: pointer to the device tree to move
+ * @buf: pointer to memory where the device is to be moved
+ * @bufsize: size of the memory space at buf
+ *
+ * fdt_move() relocates, if possible, the device tree blob located at
+ * fdt to the buffer at buf of size bufsize.  The buffer may overlap
+ * with the existing device tree blob at fdt.  Therefore,
+ *     fdt_move(fdt, fdt, fdt_totalsize(fdt))
+ * should always succeed.
+ *
+ * returns:
+ *     0, on success
+ *     -FDT_ERR_NOSPACE, bufsize is insufficient to contain the device tree
+ *     -FDT_ERR_BADMAGIC,
+ *     -FDT_ERR_BADVERSION,
+ *     -FDT_ERR_BADSTATE, standard meanings
+ */
+int fdt_move(const void *fdt, void *buf, int bufsize);
+
+/**********************************************************************/
+/* Read-only functions                                                */
+/**********************************************************************/
+
+/**
+ * fdt_string - retrieve a string from the strings block of a device tree
+ * @fdt: pointer to the device tree blob
+ * @stroffset: offset of the string within the strings block (native endian)
+ *
+ * fdt_string() retrieves a pointer to a single string from the
+ * strings block of the device tree blob at fdt.
+ *
+ * returns:
+ *     a pointer to the string, on success
+ *     NULL, if stroffset is out of bounds
+ */
+const char *fdt_string(const void *fdt, int stroffset);
+
+/**
+ * fdt_num_mem_rsv - retrieve the number of memory reserve map entries
+ * @fdt: pointer to the device tree blob
+ *
+ * Returns the number of entries in the device tree blob's memory
+ * reservation map.  This does not include the terminating 0,0 entry
+ * or any other (0,0) entries reserved for expansion.
+ *
+ * returns:
+ *     the number of entries
+ */
+int fdt_num_mem_rsv(const void *fdt);
+
+/**
+ * fdt_get_mem_rsv - retrieve one memory reserve map entry
+ * @fdt: pointer to the device tree blob
+ * @address, @size: pointers to 64-bit variables
+ *
+ * On success, *address and *size will contain the address and size of
+ * the n-th reserve map entry from the device tree blob, in
+ * native-endian format.
+ *
+ * returns:
+ *     0, on success
+ *     -FDT_ERR_BADMAGIC,
+ *     -FDT_ERR_BADVERSION,
+ *     -FDT_ERR_BADSTATE, standard meanings
+ */
+int fdt_get_mem_rsv(const void *fdt, int n, uint64_t *address, uint64_t *size);
+
+/**
+ * fdt_subnode_offset_namelen - find a subnode based on substring
+ * @fdt: pointer to the device tree blob
+ * @parentoffset: structure block offset of a node
+ * @name: name of the subnode to locate
+ * @namelen: number of characters of name to consider
+ *
+ * Identical to fdt_subnode_offset(), but only examine the first
+ * namelen characters of name for matching the subnode name.  This is
+ * useful for finding subnodes based on a portion of a larger string,
+ * such as a full path.
+ */
+int fdt_subnode_offset_namelen(const void *fdt, int parentoffset,
+                               const char *name, int namelen);
+/**
+ * fdt_subnode_offset - find a subnode of a given node
+ * @fdt: pointer to the device tree blob
+ * @parentoffset: structure block offset of a node
+ * @name: name of the subnode to locate
+ *
+ * fdt_subnode_offset() finds a subnode of the node at structure block
+ * offset parentoffset with the given name.  name may include a unit
+ * address, in which case fdt_subnode_offset() will find the subnode
+ * with that unit address, or the unit address may be omitted, in
+ * which case fdt_subnode_offset() will find an arbitrary subnode
+ * whose name excluding unit address matches the given name.
+ *
+ * returns:
+ *	structure block offset of the requested subnode (>=0), on success
+ *	-FDT_ERR_NOTFOUND, if the requested subnode does not exist
+ *	-FDT_ERR_BADOFFSET, if parentoffset did not point to an FDT_BEGIN_NODE tag
+ *      -FDT_ERR_BADMAGIC,
+ *	-FDT_ERR_BADVERSION,
+ *	-FDT_ERR_BADSTATE,
+ *	-FDT_ERR_BADSTRUCTURE,
+ *	-FDT_ERR_TRUNCATED, standard meanings.
+ */
+int fdt_subnode_offset(const void *fdt, int parentoffset, const char *name);
+
+/**
+ * fdt_path_offset - find a tree node by its full path
+ * @fdt: pointer to the device tree blob
+ * @path: full path of the node to locate
+ *
+ * fdt_path_offset() finds a node of a given path in the device tree.
+ * Each path component may omit the unit address portion, but the
+ * results of this are undefined if any such path component is
+ * ambiguous (that is if there are multiple nodes at the relevant
+ * level matching the given component, differentiated only by unit
+ * address).
+ *
+ * returns:
+ *	structure block offset of the node with the requested path (>=0), on success
+ *	-FDT_ERR_BADPATH, given path does not begin with '/' or is invalid
+ *	-FDT_ERR_NOTFOUND, if the requested node does not exist
+ *      -FDT_ERR_BADMAGIC,
+ *	-FDT_ERR_BADVERSION,
+ *	-FDT_ERR_BADSTATE,
+ *	-FDT_ERR_BADSTRUCTURE,
+ *	-FDT_ERR_TRUNCATED, standard meanings.
+ */
+int fdt_path_offset(const void *fdt, const char *path);
+
+/**
+ * fdt_get_name - retrieve the name of a given node
+ * @fdt: pointer to the device tree blob
+ * @nodeoffset: structure block offset of the starting node
+ * @lenp: pointer to an integer variable (will be overwritten) or NULL
+ *
+ * fdt_get_name() retrieves the name (including unit address) of the
+ * device tree node at structure block offset nodeoffset.  If lenp is
+ * non-NULL, the length of this name is also returned, in the integer
+ * pointed to by lenp.
+ *
+ * returns:
+ *	pointer to the node's name, on success
+ *		If lenp is non-NULL, *lenp contains the length of that name (>=0)
+ *	NULL, on error
+ *		if lenp is non-NULL *lenp contains an error code (<0):
+ *		-FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
+ *		-FDT_ERR_BADMAGIC,
+ *		-FDT_ERR_BADVERSION,
+ *		-FDT_ERR_BADSTATE, standard meanings
+ */
+const char *fdt_get_name(const void *fdt, int nodeoffset, int *lenp);
+
+/**
+ * fdt_first_property_offset - find the offset of a node's first property
+ * @fdt: pointer to the device tree blob
+ * @nodeoffset: structure block offset of a node
+ *
+ * fdt_first_property_offset() finds the first property of the node at
+ * the given structure block offset.
+ *
+ * returns:
+ *	structure block offset of the property (>=0), on success
+ *	-FDT_ERR_NOTFOUND, if the requested node has no properties
+ *	-FDT_ERR_BADOFFSET, if nodeoffset did not point to an FDT_BEGIN_NODE tag
+ *      -FDT_ERR_BADMAGIC,
+ *	-FDT_ERR_BADVERSION,
+ *	-FDT_ERR_BADSTATE,
+ *	-FDT_ERR_BADSTRUCTURE,
+ *	-FDT_ERR_TRUNCATED, standard meanings.
+ */
+int fdt_first_property_offset(const void *fdt, int nodeoffset);
+
+/**
+ * fdt_next_property_offset - step through a node's properties
+ * @fdt: pointer to the device tree blob
+ * @offset: structure block offset of a property
+ *
+ * fdt_next_property_offset() finds the property immediately after the
+ * one at the given structure block offset.  This will be a property
+ * of the same node as the given property.
+ *
+ * returns:
+ *	structure block offset of the next property (>=0), on success
+ *	-FDT_ERR_NOTFOUND, if the given property is the last in its node
+ *	-FDT_ERR_BADOFFSET, if nodeoffset did not point to an FDT_PROP tag
+ *      -FDT_ERR_BADMAGIC,
+ *	-FDT_ERR_BADVERSION,
+ *	-FDT_ERR_BADSTATE,
+ *	-FDT_ERR_BADSTRUCTURE,
+ *	-FDT_ERR_TRUNCATED, standard meanings.
+ */
+int fdt_next_property_offset(const void *fdt, int offset);
+
+/**
+ * fdt_get_property_by_offset - retrieve the property at a given offset
+ * @fdt: pointer to the device tree blob
+ * @offset: offset of the property to retrieve
+ * @lenp: pointer to an integer variable (will be overwritten) or NULL
+ *
+ * fdt_get_property_by_offset() retrieves a pointer to the
+ * fdt_property structure within the device tree blob at the given
+ * offset.  If lenp is non-NULL, the length of the property value is
+ * also returned, in the integer pointed to by lenp.
+ *
+ * returns:
+ *	pointer to the structure representing the property
+ *		if lenp is non-NULL, *lenp contains the length of the property
+ *		value (>=0)
+ *	NULL, on error
+ *		if lenp is non-NULL, *lenp contains an error code (<0):
+ *		-FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_PROP tag
+ *		-FDT_ERR_BADMAGIC,
+ *		-FDT_ERR_BADVERSION,
+ *		-FDT_ERR_BADSTATE,
+ *		-FDT_ERR_BADSTRUCTURE,
+ *		-FDT_ERR_TRUNCATED, standard meanings
+ */
+const struct fdt_property *fdt_get_property_by_offset(const void *fdt,
+                                                      int offset,
+                                                      int *lenp);
+
+/**
+ * fdt_get_property_namelen - find a property based on substring
+ * @fdt: pointer to the device tree blob
+ * @nodeoffset: offset of the node whose property to find
+ * @name: name of the property to find
+ * @namelen: number of characters of name to consider
+ * @lenp: pointer to an integer variable (will be overwritten) or NULL
+ *
+ * Identical to fdt_get_property_namelen(), but only examine the first
+ * namelen characters of name for matching the property name.
+ */
+const struct fdt_property *fdt_get_property_namelen(const void *fdt,
+                                                    int nodeoffset,
+                                                    const char *name,
+                                                    int namelen, int *lenp);
+
+/**
+ * fdt_get_property - find a given property in a given node
+ * @fdt: pointer to the device tree blob
+ * @nodeoffset: offset of the node whose property to find
+ * @name: name of the property to find
+ * @lenp: pointer to an integer variable (will be overwritten) or NULL
+ *
+ * fdt_get_property() retrieves a pointer to the fdt_property
+ * structure within the device tree blob corresponding to the property
+ * named 'name' of the node at offset nodeoffset.  If lenp is
+ * non-NULL, the length of the property value is also returned, in the
+ * integer pointed to by lenp.
+ *
+ * returns:
+ *	pointer to the structure representing the property
+ *		if lenp is non-NULL, *lenp contains the length of the property
+ *		value (>=0)
+ *	NULL, on error
+ *		if lenp is non-NULL, *lenp contains an error code (<0):
+ *		-FDT_ERR_NOTFOUND, node does not have named property
+ *		-FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
+ *		-FDT_ERR_BADMAGIC,
+ *		-FDT_ERR_BADVERSION,
+ *		-FDT_ERR_BADSTATE,
+ *		-FDT_ERR_BADSTRUCTURE,
+ *		-FDT_ERR_TRUNCATED, standard meanings
+ */
+const struct fdt_property *fdt_get_property(const void *fdt, int nodeoffset,
+                                            const char *name, int *lenp);
+static inline struct fdt_property *fdt_get_property_w(void *fdt, int nodeoffset,
+                                                      const char *name,
+                                                      int *lenp)
+{
+        return (struct fdt_property *)(uintptr_t)
+                fdt_get_property(fdt, nodeoffset, name, lenp);
+}
+
+/**
+ * fdt_getprop_by_offset - retrieve the value of a property at a given offset
+ * @fdt: pointer to the device tree blob
+ * @ffset: offset of the property to read
+ * @namep: pointer to a string variable (will be overwritten) or NULL
+ * @lenp: pointer to an integer variable (will be overwritten) or NULL
+ *
+ * fdt_getprop_by_offset() retrieves a pointer to the value of the
+ * property at structure block offset 'offset' (this will be a pointer
+ * to within the device blob itself, not a copy of the value).  If
+ * lenp is non-NULL, the length of the property value is also
+ * returned, in the integer pointed to by lenp.  If namep is non-NULL,
+ * the property's namne will also be returned in the char * pointed to
+ * by namep (this will be a pointer to within the device tree's string
+ * block, not a new copy of the name).
+ *
+ * returns:
+ *	pointer to the property's value
+ *		if lenp is non-NULL, *lenp contains the length of the property
+ *		value (>=0)
+ *		if namep is non-NULL *namep contiains a pointer to the property
+ *		name.
+ *	NULL, on error
+ *		if lenp is non-NULL, *lenp contains an error code (<0):
+ *		-FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_PROP tag
+ *		-FDT_ERR_BADMAGIC,
+ *		-FDT_ERR_BADVERSION,
+ *		-FDT_ERR_BADSTATE,
+ *		-FDT_ERR_BADSTRUCTURE,
+ *		-FDT_ERR_TRUNCATED, standard meanings
+ */
+const void *fdt_getprop_by_offset(const void *fdt, int offset,
+                                  const char **namep, int *lenp);
+
+/**
+ * fdt_getprop_namelen - get property value based on substring
+ * @fdt: pointer to the device tree blob
+ * @nodeoffset: offset of the node whose property to find
+ * @name: name of the property to find
+ * @namelen: number of characters of name to consider
+ * @lenp: pointer to an integer variable (will be overwritten) or NULL
+ *
+ * Identical to fdt_getprop(), but only examine the first namelen
+ * characters of name for matching the property name.
+ */
+const void *fdt_getprop_namelen(const void *fdt, int nodeoffset,
+                                const char *name, int namelen, int *lenp);
+
+/**
+ * fdt_getprop - retrieve the value of a given property
+ * @fdt: pointer to the device tree blob
+ * @nodeoffset: offset of the node whose property to find
+ * @name: name of the property to find
+ * @lenp: pointer to an integer variable (will be overwritten) or NULL
+ *
+ * fdt_getprop() retrieves a pointer to the value of the property
+ * named 'name' of the node at offset nodeoffset (this will be a
+ * pointer to within the device blob itself, not a copy of the value).
+ * If lenp is non-NULL, the length of the property value is also
+ * returned, in the integer pointed to by lenp.
+ *
+ * returns:
+ *	pointer to the property's value
+ *		if lenp is non-NULL, *lenp contains the length of the property
+ *		value (>=0)
+ *	NULL, on error
+ *		if lenp is non-NULL, *lenp contains an error code (<0):
+ *		-FDT_ERR_NOTFOUND, node does not have named property
+ *		-FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
+ *		-FDT_ERR_BADMAGIC,
+ *		-FDT_ERR_BADVERSION,
+ *		-FDT_ERR_BADSTATE,
+ *		-FDT_ERR_BADSTRUCTURE,
+ *		-FDT_ERR_TRUNCATED, standard meanings
+ */
+const void *fdt_getprop(const void *fdt, int nodeoffset,
+                        const char *name, int *lenp);
+static inline void *fdt_getprop_w(void *fdt, int nodeoffset,
+                                  const char *name, int *lenp)
+{
+        return (void *)(uintptr_t)fdt_getprop(fdt, nodeoffset, name, lenp);
+}
+
+/**
+ * fdt_get_phandle - retrieve the phandle of a given node
+ * @fdt: pointer to the device tree blob
+ * @nodeoffset: structure block offset of the node
+ *
+ * fdt_get_phandle() retrieves the phandle of the device tree node at
+ * structure block offset nodeoffset.
+ *
+ * returns:
+ *	the phandle of the node at nodeoffset, on success (!= 0, != -1)
+ *	0, if the node has no phandle, or another error occurs
+ */
+uint32_t fdt_get_phandle(const void *fdt, int nodeoffset);
+
+/**
+ * fdt_get_alias_namelen - get alias based on substring
+ * @fdt: pointer to the device tree blob
+ * @name: name of the alias th look up
+ * @namelen: number of characters of name to consider
+ *
+ * Identical to fdt_get_alias(), but only examine the first namelen
+ * characters of name for matching the alias name.
+ */
+const char *fdt_get_alias_namelen(const void *fdt,
+                                  const char *name, int namelen);
+
+/**
+ * fdt_get_alias - retreive the path referenced by a given alias
+ * @fdt: pointer to the device tree blob
+ * @name: name of the alias th look up
+ *
+ * fdt_get_alias() retrieves the value of a given alias.  That is, the
+ * value of the property named 'name' in the node /aliases.
+ *
+ * returns:
+ *	a pointer to the expansion of the alias named 'name', of it exists
+ *	NULL, if the given alias or the /aliases node does not exist
+ */
+const char *fdt_get_alias(const void *fdt, const char *name);
+
+/**
+ * fdt_get_path - determine the full path of a node
+ * @fdt: pointer to the device tree blob
+ * @nodeoffset: offset of the node whose path to find
+ * @buf: character buffer to contain the returned path (will be overwritten)
+ * @buflen: size of the character buffer at buf
+ *
+ * fdt_get_path() computes the full path of the node at offset
+ * nodeoffset, and records that path in the buffer at buf.
+ *
+ * NOTE: This function is expensive, as it must scan the device tree
+ * structure from the start to nodeoffset.
+ *
+ * returns:
+ *	0, on success
+ *		buf contains the absolute path of the node at
+ *		nodeoffset, as a NUL-terminated string.
+ * 	-FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag
+ *	-FDT_ERR_NOSPACE, the path of the given node is longer than (bufsize-1)
+ *		characters and will not fit in the given buffer.
+ *	-FDT_ERR_BADMAGIC,
+ *	-FDT_ERR_BADVERSION,
+ *	-FDT_ERR_BADSTATE,
+ *	-FDT_ERR_BADSTRUCTURE, standard meanings
+ */
+int fdt_get_path(const void *fdt, int nodeoffset, char *buf, int buflen);
+
+/**
+ * fdt_supernode_atdepth_offset - find a specific ancestor of a node
+ * @fdt: pointer to the device tree blob
+ * @nodeoffset: offset of the node whose parent to find
+ * @supernodedepth: depth of the ancestor to find
+ * @nodedepth: pointer to an integer variable (will be overwritten) or NULL
+ *
+ * fdt_supernode_atdepth_offset() finds an ancestor of the given node
+ * at a specific depth from the root (where the root itself has depth
+ * 0, its immediate subnodes depth 1 and so forth).  So
+ *	fdt_supernode_atdepth_offset(fdt, nodeoffset, 0, NULL);
+ * will always return 0, the offset of the root node.  If the node at
+ * nodeoffset has depth D, then:
+ *	fdt_supernode_atdepth_offset(fdt, nodeoffset, D, NULL);
+ * will return nodeoffset itself.
+ *
+ * NOTE: This function is expensive, as it must scan the device tree
+ * structure from the start to nodeoffset.
+ *
+ * returns:
+
+ *	structure block offset of the node at node offset's ancestor
+ *		of depth supernodedepth (>=0), on success
+ * 	-FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag
+*	-FDT_ERR_NOTFOUND, supernodedepth was greater than the depth of nodeoffset
+ *	-FDT_ERR_BADMAGIC,
+ *	-FDT_ERR_BADVERSION,
+ *	-FDT_ERR_BADSTATE,
+ *	-FDT_ERR_BADSTRUCTURE, standard meanings
+ */
+int fdt_supernode_atdepth_offset(const void *fdt, int nodeoffset,
+                                 int supernodedepth, int *nodedepth);
+
+/**
+ * fdt_node_depth - find the depth of a given node
+ * @fdt: pointer to the device tree blob
+ * @nodeoffset: offset of the node whose parent to find
+ *
+ * fdt_node_depth() finds the depth of a given node.  The root node
+ * has depth 0, its immediate subnodes depth 1 and so forth.
+ *
+ * NOTE: This function is expensive, as it must scan the device tree
+ * structure from the start to nodeoffset.
+ *
+ * returns:
+ *	depth of the node at nodeoffset (>=0), on success
+ * 	-FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag
+ *	-FDT_ERR_BADMAGIC,
+ *	-FDT_ERR_BADVERSION,
+ *	-FDT_ERR_BADSTATE,
+ *	-FDT_ERR_BADSTRUCTURE, standard meanings
+ */
+int fdt_node_depth(const void *fdt, int nodeoffset);
+
+/**
+ * fdt_parent_offset - find the parent of a given node
+ * @fdt: pointer to the device tree blob
+ * @nodeoffset: offset of the node whose parent to find
+ *
+ * fdt_parent_offset() locates the parent node of a given node (that
+ * is, it finds the offset of the node which contains the node at
+ * nodeoffset as a subnode).
+ *
+ * NOTE: This function is expensive, as it must scan the device tree
+ * structure from the start to nodeoffset, *twice*.
+ *
+ * returns:
+ *	structure block offset of the parent of the node at nodeoffset
+ *		(>=0), on success
+ * 	-FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag
+ *	-FDT_ERR_BADMAGIC,
+ *	-FDT_ERR_BADVERSION,
+ *	-FDT_ERR_BADSTATE,
+ *	-FDT_ERR_BADSTRUCTURE, standard meanings
+ */
+int fdt_parent_offset(const void *fdt, int nodeoffset);
+
+/**
+ * fdt_node_offset_by_prop_value - find nodes with a given property value
+ * @fdt: pointer to the device tree blob
+ * @startoffset: only find nodes after this offset
+ * @propname: property name to check
+ * @propval: property value to search for
+ * @proplen: length of the value in propval
+ *
+ * fdt_node_offset_by_prop_value() returns the offset of the first
+ * node after startoffset, which has a property named propname whose
+ * value is of length proplen and has value equal to propval; or if
+ * startoffset is -1, the very first such node in the tree.
+ *
+ * To iterate through all nodes matching the criterion, the following
+ * idiom can be used:
+ *	offset = fdt_node_offset_by_prop_value(fdt, -1, propname,
+ *					       propval, proplen);
+ *	while (offset != -FDT_ERR_NOTFOUND) {
+ *		// other code here
+ *		offset = fdt_node_offset_by_prop_value(fdt, offset, propname,
+ *						       propval, proplen);
+ *	}
+ *
+ * Note the -1 in the first call to the function, if 0 is used here
+ * instead, the function will never locate the root node, even if it
+ * matches the criterion.
+ *
+ * returns:
+ *	structure block offset of the located node (>= 0, >startoffset),
+ *		 on success
+ *	-FDT_ERR_NOTFOUND, no node matching the criterion exists in the
+ *		tree after startoffset
+ * 	-FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag
+ *	-FDT_ERR_BADMAGIC,
+ *	-FDT_ERR_BADVERSION,
+ *	-FDT_ERR_BADSTATE,
+ *	-FDT_ERR_BADSTRUCTURE, standard meanings
+ */
+int fdt_node_offset_by_prop_value(const void *fdt, int startoffset,
+                                  const char *propname,
+                                  const void *propval, int proplen);
+
+/**
+ * fdt_node_offset_by_phandle - find the node with a given phandle
+ * @fdt: pointer to the device tree blob
+ * @phandle: phandle value
+ *
+ * fdt_node_offset_by_phandle() returns the offset of the node
+ * which has the given phandle value.  If there is more than one node
+ * in the tree with the given phandle (an invalid tree), results are
+ * undefined.
+ *
+ * returns:
+ *	structure block offset of the located node (>= 0), on success
+ *	-FDT_ERR_NOTFOUND, no node with that phandle exists
+ *	-FDT_ERR_BADPHANDLE, given phandle value was invalid (0 or -1)
+ *	-FDT_ERR_BADMAGIC,
+ *	-FDT_ERR_BADVERSION,
+ *	-FDT_ERR_BADSTATE,
+ *	-FDT_ERR_BADSTRUCTURE, standard meanings
+ */
+int fdt_node_offset_by_phandle(const void *fdt, uint32_t phandle);
+
+/**
+ * fdt_node_check_compatible: check a node's compatible property
+ * @fdt: pointer to the device tree blob
+ * @nodeoffset: offset of a tree node
+ * @compatible: string to match against
+ *
+ *
+ * fdt_node_check_compatible() returns 0 if the given node contains a
+ * 'compatible' property with the given string as one of its elements,
+ * it returns non-zero otherwise, or on error.
+ *
+ * returns:
+ *	0, if the node has a 'compatible' property listing the given string
+ *	1, if the node has a 'compatible' property, but it does not list
+ *		the given string
+ *	-FDT_ERR_NOTFOUND, if the given node has no 'compatible' property
+ * 	-FDT_ERR_BADOFFSET, if nodeoffset does not refer to a BEGIN_NODE tag
+ *	-FDT_ERR_BADMAGIC,
+ *	-FDT_ERR_BADVERSION,
+ *	-FDT_ERR_BADSTATE,
+ *	-FDT_ERR_BADSTRUCTURE, standard meanings
+ */
+int fdt_node_check_compatible(const void *fdt, int nodeoffset,
+                              const char *compatible);
+
+/**
+ * fdt_node_offset_by_compatible - find nodes with a given 'compatible' value
+ * @fdt: pointer to the device tree blob
+ * @startoffset: only find nodes after this offset
+ * @compatible: 'compatible' string to match against
+ *
+ * fdt_node_offset_by_compatible() returns the offset of the first
+ * node after startoffset, which has a 'compatible' property which
+ * lists the given compatible string; or if startoffset is -1, the
+ * very first such node in the tree.
+ *
+ * To iterate through all nodes matching the criterion, the following
+ * idiom can be used:
+ *	offset = fdt_node_offset_by_compatible(fdt, -1, compatible);
+ *	while (offset != -FDT_ERR_NOTFOUND) {
+ *		// other code here
+ *		offset = fdt_node_offset_by_compatible(fdt, offset, compatible);
+ *	}
+ *
+ * Note the -1 in the first call to the function, if 0 is used here
+ * instead, the function will never locate the root node, even if it
+ * matches the criterion.
+ *
+ * returns:
+ *	structure block offset of the located node (>= 0, >startoffset),
+ *		 on success
+ *	-FDT_ERR_NOTFOUND, no node matching the criterion exists in the
+ *		tree after startoffset
+ * 	-FDT_ERR_BADOFFSET, nodeoffset does not refer to a BEGIN_NODE tag
+ *	-FDT_ERR_BADMAGIC,
+ *	-FDT_ERR_BADVERSION,
+ *	-FDT_ERR_BADSTATE,
+ *	-FDT_ERR_BADSTRUCTURE, standard meanings
+ */
+int fdt_node_offset_by_compatible(const void *fdt, int startoffset,
+                                  const char *compatible);
+
+/**********************************************************************/
+/* Write-in-place functions                                           */
+/**********************************************************************/
+
+/**
+ * fdt_setprop_inplace - change a property's value, but not its size
+ * @fdt: pointer to the device tree blob
+ * @nodeoffset: offset of the node whose property to change
+ * @name: name of the property to change
+ * @val: pointer to data to replace the property value with
+ * @len: length of the property value
+ *
+ * fdt_setprop_inplace() replaces the value of a given property with
+ * the data in val, of length len.  This function cannot change the
+ * size of a property, and so will only work if len is equal to the
+ * current length of the property.
+ *
+ * This function will alter only the bytes in the blob which contain
+ * the given property value, and will not alter or move any other part
+ * of the tree.
+ *
+ * returns:
+ *	0, on success
+ *	-FDT_ERR_NOSPACE, if len is not equal to the property's current length
+ *	-FDT_ERR_NOTFOUND, node does not have the named property
+ *	-FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
+ *	-FDT_ERR_BADMAGIC,
+ *	-FDT_ERR_BADVERSION,
+ *	-FDT_ERR_BADSTATE,
+ *	-FDT_ERR_BADSTRUCTURE,
+ *	-FDT_ERR_TRUNCATED, standard meanings
+ */
+int fdt_setprop_inplace(void *fdt, int nodeoffset, const char *name,
+                        const void *val, int len);
+
+/**
+ * fdt_setprop_inplace_u32 - change the value of a 32-bit integer property
+ * @fdt: pointer to the device tree blob
+ * @nodeoffset: offset of the node whose property to change
+ * @name: name of the property to change
+ * @val: 32-bit integer value to replace the property with
+ *
+ * fdt_setprop_inplace_u32() replaces the value of a given property
+ * with the 32-bit integer value in val, converting val to big-endian
+ * if necessary.  This function cannot change the size of a property,
+ * and so will only work if the property already exists and has length
+ * 4.
+ *
+ * This function will alter only the bytes in the blob which contain
+ * the given property value, and will not alter or move any other part
+ * of the tree.
+ *
+ * returns:
+ *	0, on success
+ *	-FDT_ERR_NOSPACE, if the property's length is not equal to 4
+ *	-FDT_ERR_NOTFOUND, node does not have the named property
+ *	-FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
+ *	-FDT_ERR_BADMAGIC,
+ *	-FDT_ERR_BADVERSION,
+ *	-FDT_ERR_BADSTATE,
+ *	-FDT_ERR_BADSTRUCTURE,
+ *	-FDT_ERR_TRUNCATED, standard meanings
+ */
+static inline int fdt_setprop_inplace_u32(void *fdt, int nodeoffset,
+                                          const char *name, uint32_t val)
+{
+        fdt32_t tmp = cpu_to_fdt32(val);
+        return fdt_setprop_inplace(fdt, nodeoffset, name, &tmp, sizeof(tmp));
+}
+
+/**
+ * fdt_setprop_inplace_u64 - change the value of a 64-bit integer property
+ * @fdt: pointer to the device tree blob
+ * @nodeoffset: offset of the node whose property to change
+ * @name: name of the property to change
+ * @val: 64-bit integer value to replace the property with
+ *
+ * fdt_setprop_inplace_u64() replaces the value of a given property
+ * with the 64-bit integer value in val, converting val to big-endian
+ * if necessary.  This function cannot change the size of a property,
+ * and so will only work if the property already exists and has length
+ * 8.
+ *
+ * This function will alter only the bytes in the blob which contain
+ * the given property value, and will not alter or move any other part
+ * of the tree.
+ *
+ * returns:
+ *	0, on success
+ *	-FDT_ERR_NOSPACE, if the property's length is not equal to 8
+ *	-FDT_ERR_NOTFOUND, node does not have the named property
+ *	-FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
+ *	-FDT_ERR_BADMAGIC,
+ *	-FDT_ERR_BADVERSION,
+ *	-FDT_ERR_BADSTATE,
+ *	-FDT_ERR_BADSTRUCTURE,
+ *	-FDT_ERR_TRUNCATED, standard meanings
+ */
+static inline int fdt_setprop_inplace_u64(void *fdt, int nodeoffset,
+                                          const char *name, uint64_t val)
+{
+        fdt64_t tmp = cpu_to_fdt64(val);
+        return fdt_setprop_inplace(fdt, nodeoffset, name, &tmp, sizeof(tmp));
+}
+
+/**
+ * fdt_setprop_inplace_cell - change the value of a single-cell property
+ *
+ * This is an alternative name for fdt_setprop_inplace_u32()
+ */
+static inline int fdt_setprop_inplace_cell(void *fdt, int nodeoffset,
+                                           const char *name, uint32_t val)
+{
+        return fdt_setprop_inplace_u32(fdt, nodeoffset, name, val);
+}
+
+/**
+ * fdt_nop_property - replace a property with nop tags
+ * @fdt: pointer to the device tree blob
+ * @nodeoffset: offset of the node whose property to nop
+ * @name: name of the property to nop
+ *
+ * fdt_nop_property() will replace a given property's representation
+ * in the blob with FDT_NOP tags, effectively removing it from the
+ * tree.
+ *
+ * This function will alter only the bytes in the blob which contain
+ * the property, and will not alter or move any other part of the
+ * tree.
+ *
+ * returns:
+ *	0, on success
+ *	-FDT_ERR_NOTFOUND, node does not have the named property
+ *	-FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
+ *	-FDT_ERR_BADMAGIC,
+ *	-FDT_ERR_BADVERSION,
+ *	-FDT_ERR_BADSTATE,
+ *	-FDT_ERR_BADSTRUCTURE,
+ *	-FDT_ERR_TRUNCATED, standard meanings
+ */
+int fdt_nop_property(void *fdt, int nodeoffset, const char *name);
+
+/**
+ * fdt_nop_node - replace a node (subtree) with nop tags
+ * @fdt: pointer to the device tree blob
+ * @nodeoffset: offset of the node to nop
+ *
+ * fdt_nop_node() will replace a given node's representation in the
+ * blob, including all its subnodes, if any, with FDT_NOP tags,
+ * effectively removing it from the tree.
+ *
+ * This function will alter only the bytes in the blob which contain
+ * the node and its properties and subnodes, and will not alter or
+ * move any other part of the tree.
+ *
+ * returns:
+ *	0, on success
+ *	-FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
+ *	-FDT_ERR_BADMAGIC,
+ *	-FDT_ERR_BADVERSION,
+ *	-FDT_ERR_BADSTATE,
+ *	-FDT_ERR_BADSTRUCTURE,
+ *	-FDT_ERR_TRUNCATED, standard meanings
+ */
+int fdt_nop_node(void *fdt, int nodeoffset);
+
+/**********************************************************************/
+/* Sequential write functions                                         */
+/**********************************************************************/
+
+int fdt_create(void *buf, int bufsize);
+int fdt_add_reservemap_entry(void *fdt, uint64_t addr, uint64_t size);
+int fdt_finish_reservemap(void *fdt);
+int fdt_begin_node(void *fdt, const char *name);
+int fdt_property(void *fdt, const char *name, const void *val, int len);
+static inline int fdt_property_u32(void *fdt, const char *name, uint32_t val)
+{
+        fdt32_t tmp = cpu_to_fdt32(val);
+        return fdt_property(fdt, name, &tmp, sizeof(tmp));
+}
+static inline int fdt_property_u64(void *fdt, const char *name, uint64_t val)
+{
+        fdt64_t tmp = cpu_to_fdt64(val);
+        return fdt_property(fdt, name, &tmp, sizeof(tmp));
+}
+static inline int fdt_property_cell(void *fdt, const char *name, uint32_t val)
+{
+        return fdt_property_u32(fdt, name, val);
+}
+#define fdt_property_string(fdt, name, str) \
+        fdt_property(fdt, name, str, strlen(str)+1)
+int fdt_end_node(void *fdt);
+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);
+
+/**
+ * fdt_add_mem_rsv - add one memory reserve map entry
+ * @fdt: pointer to the device tree blob
+ * @address, @size: 64-bit values (native endian)
+ *
+ * Adds a reserve map entry to the given blob reserving a region at
+ * address address of length size.
+ *
+ * This function will insert data into the reserve map and will
+ * therefore change the indexes of some entries in the table.
+ *
+ * returns:
+ *	0, on success
+ *	-FDT_ERR_NOSPACE, there is insufficient free space in the blob to
+ *		contain the new reservation entry
+ *	-FDT_ERR_BADMAGIC,
+ *	-FDT_ERR_BADVERSION,
+ *	-FDT_ERR_BADSTATE,
+ *	-FDT_ERR_BADSTRUCTURE,
+ *	-FDT_ERR_BADLAYOUT,
+ *	-FDT_ERR_TRUNCATED, standard meanings
+ */
+int fdt_add_mem_rsv(void *fdt, uint64_t address, uint64_t size);
+
+/**
+ * fdt_del_mem_rsv - remove a memory reserve map entry
+ * @fdt: pointer to the device tree blob
+ * @n: entry to remove
+ *
+ * fdt_del_mem_rsv() removes the n-th memory reserve map entry from
+ * the blob.
+ *
+ * This function will delete data from the reservation table and will
+ * therefore change the indexes of some entries in the table.
+ *
+ * returns:
+ *	0, on success
+ *	-FDT_ERR_NOTFOUND, there is no entry of the given index (i.e. there
+ *		are less than n+1 reserve map entries)
+ *	-FDT_ERR_BADMAGIC,
+ *	-FDT_ERR_BADVERSION,
+ *	-FDT_ERR_BADSTATE,
+ *	-FDT_ERR_BADSTRUCTURE,
+ *	-FDT_ERR_BADLAYOUT,
+ *	-FDT_ERR_TRUNCATED, standard meanings
+ */
+int fdt_del_mem_rsv(void *fdt, int n);
+
+/**
+ * fdt_set_name - change the name of a given node
+ * @fdt: pointer to the device tree blob
+ * @nodeoffset: structure block offset of a node
+ * @name: name to give the node
+ *
+ * fdt_set_name() replaces the name (including unit address, if any)
+ * of the given node with the given string.  NOTE: this function can't
+ * efficiently check if the new name is unique amongst the given
+ * node's siblings; results are undefined if this function is invoked
+ * with a name equal to one of the given node's siblings.
+ *
+ * This function may insert or delete data from the blob, and will
+ * therefore change the offsets of some existing nodes.
+ *
+ * returns:
+ *	0, on success
+ *	-FDT_ERR_NOSPACE, there is insufficient free space in the blob
+ *		to contain the new name
+ *	-FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
+ *	-FDT_ERR_BADMAGIC,
+ *	-FDT_ERR_BADVERSION,
+ *	-FDT_ERR_BADSTATE, standard meanings
+ */
+int fdt_set_name(void *fdt, int nodeoffset, const char *name);
+
+/**
+ * fdt_setprop - create or change a property
+ * @fdt: pointer to the device tree blob
+ * @nodeoffset: offset of the node whose property to change
+ * @name: name of the property to change
+ * @val: pointer to data to set the property value to
+ * @len: length of the property value
+ *
+ * fdt_setprop() sets the value of the named property in the given
+ * node to the given value and length, creating the property if it
+ * does not already exist.
+ *
+ * This function may insert or delete data from the blob, and will
+ * therefore change the offsets of some existing nodes.
+ *
+ * returns:
+ *	0, on success
+ *	-FDT_ERR_NOSPACE, there is insufficient free space in the blob to
+ *		contain the new property value
+ *	-FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
+ *	-FDT_ERR_BADLAYOUT,
+ *	-FDT_ERR_BADMAGIC,
+ *	-FDT_ERR_BADVERSION,
+ *	-FDT_ERR_BADSTATE,
+ *	-FDT_ERR_BADSTRUCTURE,
+ *	-FDT_ERR_BADLAYOUT,
+ *	-FDT_ERR_TRUNCATED, standard meanings
+ */
+int fdt_setprop(void *fdt, int nodeoffset, const char *name,
+                const void *val, int len);
+
+/**
+ * fdt_setprop_u32 - set a property to a 32-bit integer
+ * @fdt: pointer to the device tree blob
+ * @nodeoffset: offset of the node whose property to change
+ * @name: name of the property to change
+ * @val: 32-bit integer value for the property (native endian)
+ *
+ * fdt_setprop_u32() sets the value of the named property in the given
+ * node to the given 32-bit integer value (converting to big-endian if
+ * necessary), or creates a new property with that value if it does
+ * not already exist.
+ *
+ * This function may insert or delete data from the blob, and will
+ * therefore change the offsets of some existing nodes.
+ *
+ * returns:
+ *	0, on success
+ *	-FDT_ERR_NOSPACE, there is insufficient free space in the blob to
+ *		contain the new property value
+ *	-FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
+ *	-FDT_ERR_BADLAYOUT,
+ *	-FDT_ERR_BADMAGIC,
+ *	-FDT_ERR_BADVERSION,
+ *	-FDT_ERR_BADSTATE,
+ *	-FDT_ERR_BADSTRUCTURE,
+ *	-FDT_ERR_BADLAYOUT,
+ *	-FDT_ERR_TRUNCATED, standard meanings
+ */
+static inline int fdt_setprop_u32(void *fdt, int nodeoffset, const char *name,
+                                  uint32_t val)
+{
+        fdt32_t tmp = cpu_to_fdt32(val);
+        return fdt_setprop(fdt, nodeoffset, name, &tmp, sizeof(tmp));
+}
+
+/**
+ * fdt_setprop_u64 - set a property to a 64-bit integer
+ * @fdt: pointer to the device tree blob
+ * @nodeoffset: offset of the node whose property to change
+ * @name: name of the property to change
+ * @val: 64-bit integer value for the property (native endian)
+ *
+ * fdt_setprop_u64() sets the value of the named property in the given
+ * node to the given 64-bit integer value (converting to big-endian if
+ * necessary), or creates a new property with that value if it does
+ * not already exist.
+ *
+ * This function may insert or delete data from the blob, and will
+ * therefore change the offsets of some existing nodes.
+ *
+ * returns:
+ *	0, on success
+ *	-FDT_ERR_NOSPACE, there is insufficient free space in the blob to
+ *		contain the new property value
+ *	-FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
+ *	-FDT_ERR_BADLAYOUT,
+ *	-FDT_ERR_BADMAGIC,
+ *	-FDT_ERR_BADVERSION,
+ *	-FDT_ERR_BADSTATE,
+ *	-FDT_ERR_BADSTRUCTURE,
+ *	-FDT_ERR_BADLAYOUT,
+ *	-FDT_ERR_TRUNCATED, standard meanings
+ */
+static inline int fdt_setprop_u64(void *fdt, int nodeoffset, const char *name,
+                                  uint64_t val)
+{
+        fdt64_t tmp = cpu_to_fdt64(val);
+        return fdt_setprop(fdt, nodeoffset, name, &tmp, sizeof(tmp));
+}
+
+/**
+ * fdt_setprop_cell - set a property to a single cell value
+ *
+ * This is an alternative name for fdt_setprop_u32()
+ */
+static inline int fdt_setprop_cell(void *fdt, int nodeoffset, const char *name,
+                                   uint32_t val)
+{
+        return fdt_setprop_u32(fdt, nodeoffset, name, val);
+}
+
+/**
+ * fdt_setprop_string - set a property to a string value
+ * @fdt: pointer to the device tree blob
+ * @nodeoffset: offset of the node whose property to change
+ * @name: name of the property to change
+ * @str: string value for the property
+ *
+ * fdt_setprop_string() sets the value of the named property in the
+ * given node to the given string value (using the length of the
+ * string to determine the new length of the property), or creates a
+ * new property with that value if it does not already exist.
+ *
+ * This function may insert or delete data from the blob, and will
+ * therefore change the offsets of some existing nodes.
+ *
+ * returns:
+ *	0, on success
+ *	-FDT_ERR_NOSPACE, there is insufficient free space in the blob to
+ *		contain the new property value
+ *	-FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
+ *	-FDT_ERR_BADLAYOUT,
+ *	-FDT_ERR_BADMAGIC,
+ *	-FDT_ERR_BADVERSION,
+ *	-FDT_ERR_BADSTATE,
+ *	-FDT_ERR_BADSTRUCTURE,
+ *	-FDT_ERR_BADLAYOUT,
+ *	-FDT_ERR_TRUNCATED, standard meanings
+ */
+#define fdt_setprop_string(fdt, nodeoffset, name, str) \
+        fdt_setprop((fdt), (nodeoffset), (name), (str), strlen(str)+1)
+
+/**
+ * fdt_appendprop - append to or create a property
+ * @fdt: pointer to the device tree blob
+ * @nodeoffset: offset of the node whose property to change
+ * @name: name of the property to append to
+ * @val: pointer to data to append to the property value
+ * @len: length of the data to append to the property value
+ *
+ * fdt_appendprop() appends the value to the named property in the
+ * given node, creating the property if it does not already exist.
+ *
+ * This function may insert data into the blob, and will therefore
+ * change the offsets of some existing nodes.
+ *
+ * returns:
+ *	0, on success
+ *	-FDT_ERR_NOSPACE, there is insufficient free space in the blob to
+ *		contain the new property value
+ *	-FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
+ *	-FDT_ERR_BADLAYOUT,
+ *	-FDT_ERR_BADMAGIC,
+ *	-FDT_ERR_BADVERSION,
+ *	-FDT_ERR_BADSTATE,
+ *	-FDT_ERR_BADSTRUCTURE,
+ *	-FDT_ERR_BADLAYOUT,
+ *	-FDT_ERR_TRUNCATED, standard meanings
+ */
+int fdt_appendprop(void *fdt, int nodeoffset, const char *name,
+                   const void *val, int len);
+
+/**
+ * fdt_appendprop_u32 - append a 32-bit integer value to a property
+ * @fdt: pointer to the device tree blob
+ * @nodeoffset: offset of the node whose property to change
+ * @name: name of the property to change
+ * @val: 32-bit integer value to append to the property (native endian)
+ *
+ * fdt_appendprop_u32() appends the given 32-bit integer value
+ * (converting to big-endian if necessary) to the value of the named
+ * property in the given node, or creates a new property with that
+ * value if it does not already exist.
+ *
+ * This function may insert data into the blob, and will therefore
+ * change the offsets of some existing nodes.
+ *
+ * returns:
+ *	0, on success
+ *	-FDT_ERR_NOSPACE, there is insufficient free space in the blob to
+ *		contain the new property value
+ *	-FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
+ *	-FDT_ERR_BADLAYOUT,
+ *	-FDT_ERR_BADMAGIC,
+ *	-FDT_ERR_BADVERSION,
+ *	-FDT_ERR_BADSTATE,
+ *	-FDT_ERR_BADSTRUCTURE,
+ *	-FDT_ERR_BADLAYOUT,
+ *	-FDT_ERR_TRUNCATED, standard meanings
+ */
+static inline int fdt_appendprop_u32(void *fdt, int nodeoffset,
+                                     const char *name, uint32_t val)
+{
+        fdt32_t tmp = cpu_to_fdt32(val);
+        return fdt_appendprop(fdt, nodeoffset, name, &tmp, sizeof(tmp));
+}
+
+/**
+ * fdt_appendprop_u64 - append a 64-bit integer value to a property
+ * @fdt: pointer to the device tree blob
+ * @nodeoffset: offset of the node whose property to change
+ * @name: name of the property to change
+ * @val: 64-bit integer value to append to the property (native endian)
+ *
+ * fdt_appendprop_u64() appends the given 64-bit integer value
+ * (converting to big-endian if necessary) to the value of the named
+ * property in the given node, or creates a new property with that
+ * value if it does not already exist.
+ *
+ * This function may insert data into the blob, and will therefore
+ * change the offsets of some existing nodes.
+ *
+ * returns:
+ *	0, on success
+ *	-FDT_ERR_NOSPACE, there is insufficient free space in the blob to
+ *		contain the new property value
+ *	-FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
+ *	-FDT_ERR_BADLAYOUT,
+ *	-FDT_ERR_BADMAGIC,
+ *	-FDT_ERR_BADVERSION,
+ *	-FDT_ERR_BADSTATE,
+ *	-FDT_ERR_BADSTRUCTURE,
+ *	-FDT_ERR_BADLAYOUT,
+ *	-FDT_ERR_TRUNCATED, standard meanings
+ */
+static inline int fdt_appendprop_u64(void *fdt, int nodeoffset,
+                                     const char *name, uint64_t val)
+{
+        fdt64_t tmp = cpu_to_fdt64(val);
+        return fdt_appendprop(fdt, nodeoffset, name, &tmp, sizeof(tmp));
+}
+
+/**
+ * fdt_appendprop_cell - append a single cell value to a property
+ *
+ * This is an alternative name for fdt_appendprop_u32()
+ */
+static inline int fdt_appendprop_cell(void *fdt, int nodeoffset,
+                                      const char *name, uint32_t val)
+{
+        return fdt_appendprop_u32(fdt, nodeoffset, name, val);
+}
+
+/**
+ * fdt_appendprop_string - append a string to a property
+ * @fdt: pointer to the device tree blob
+ * @nodeoffset: offset of the node whose property to change
+ * @name: name of the property to change
+ * @str: string value to append to the property
+ *
+ * fdt_appendprop_string() appends the given string to the value of
+ * the named property in the given node, or creates a new property
+ * with that value if it does not already exist.
+ *
+ * This function may insert data into the blob, and will therefore
+ * change the offsets of some existing nodes.
+ *
+ * returns:
+ *	0, on success
+ *	-FDT_ERR_NOSPACE, there is insufficient free space in the blob to
+ *		contain the new property value
+ *	-FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
+ *	-FDT_ERR_BADLAYOUT,
+ *	-FDT_ERR_BADMAGIC,
+ *	-FDT_ERR_BADVERSION,
+ *	-FDT_ERR_BADSTATE,
+ *	-FDT_ERR_BADSTRUCTURE,
+ *	-FDT_ERR_BADLAYOUT,
+ *	-FDT_ERR_TRUNCATED, standard meanings
+ */
+#define fdt_appendprop_string(fdt, nodeoffset, name, str) \
+        fdt_appendprop((fdt), (nodeoffset), (name), (str), strlen(str)+1)
+
+/**
+ * fdt_delprop - delete a property
+ * @fdt: pointer to the device tree blob
+ * @nodeoffset: offset of the node whose property to nop
+ * @name: name of the property to nop
+ *
+ * fdt_del_property() will delete the given property.
+ *
+ * This function will delete data from the blob, and will therefore
+ * change the offsets of some existing nodes.
+ *
+ * returns:
+ *	0, on success
+ *	-FDT_ERR_NOTFOUND, node does not have the named property
+ *	-FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
+ *	-FDT_ERR_BADLAYOUT,
+ *	-FDT_ERR_BADMAGIC,
+ *	-FDT_ERR_BADVERSION,
+ *	-FDT_ERR_BADSTATE,
+ *	-FDT_ERR_BADSTRUCTURE,
+ *	-FDT_ERR_TRUNCATED, standard meanings
+ */
+int fdt_delprop(void *fdt, int nodeoffset, const char *name);
+
+/**
+ * fdt_add_subnode_namelen - creates a new node based on substring
+ * @fdt: pointer to the device tree blob
+ * @parentoffset: structure block offset of a node
+ * @name: name of the subnode to locate
+ * @namelen: number of characters of name to consider
+ *
+ * Identical to fdt_add_subnode(), but use only the first namelen
+ * characters of name as the name of the new node.  This is useful for
+ * creating subnodes based on a portion of a larger string, such as a
+ * full path.
+ */
+int fdt_add_subnode_namelen(void *fdt, int parentoffset,
+                            const char *name, int namelen);
+
+/**
+ * fdt_add_subnode - creates a new node
+ * @fdt: pointer to the device tree blob
+ * @parentoffset: structure block offset of a node
+ * @name: name of the subnode to locate
+ *
+ * fdt_add_subnode() creates a new node as a subnode of the node at
+ * structure block offset parentoffset, with the given name (which
+ * should include the unit address, if any).
+ *
+ * This function will insert data into the blob, and will therefore
+ * change the offsets of some existing nodes.
+
+ * returns:
+ *	structure block offset of the created nodeequested subnode (>=0), on success
+ *	-FDT_ERR_NOTFOUND, if the requested subnode does not exist
+ *	-FDT_ERR_BADOFFSET, if parentoffset did not point to an FDT_BEGIN_NODE tag
+ *	-FDT_ERR_EXISTS, if the node at parentoffset already has a subnode of
+ *		the given name
+ *	-FDT_ERR_NOSPACE, if there is insufficient free space in the
+ *		blob to contain the new node
+ *	-FDT_ERR_NOSPACE
+ *	-FDT_ERR_BADLAYOUT
+ *      -FDT_ERR_BADMAGIC,
+ *	-FDT_ERR_BADVERSION,
+ *	-FDT_ERR_BADSTATE,
+ *	-FDT_ERR_BADSTRUCTURE,
+ *	-FDT_ERR_TRUNCATED, standard meanings.
+ */
+int fdt_add_subnode(void *fdt, int parentoffset, const char *name);
+
+/**
+ * fdt_del_node - delete a node (subtree)
+ * @fdt: pointer to the device tree blob
+ * @nodeoffset: offset of the node to nop
+ *
+ * fdt_del_node() will remove the given node, including all its
+ * subnodes if any, from the blob.
+ *
+ * This function will delete data from the blob, and will therefore
+ * change the offsets of some existing nodes.
+ *
+ * returns:
+ *	0, on success
+ *	-FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag
+ *	-FDT_ERR_BADLAYOUT,
+ *	-FDT_ERR_BADMAGIC,
+ *	-FDT_ERR_BADVERSION,
+ *	-FDT_ERR_BADSTATE,
+ *	-FDT_ERR_BADSTRUCTURE,
+ *	-FDT_ERR_TRUNCATED, standard meanings
+ */
+int fdt_del_node(void *fdt, int nodeoffset);
+
+/**********************************************************************/
+/* Debugging / informational functions                                */
+/**********************************************************************/
+
+const char *fdt_strerror(int errval);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _LIBFDT_H */
diff --git a/ext/libfdt/libfdt_env.h b/ext/libfdt/libfdt_env.h
new file mode 100644
index 000000000..15fecf89d
--- /dev/null
+++ b/ext/libfdt/libfdt_env.h
@@ -0,0 +1,90 @@
+/*
+ * libfdt - Flat Device Tree manipulation
+ * Copyright (C) 2006 David Gibson, IBM Corporation.
+ *
+ *     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.
+ */
+#ifndef _LIBFDT_ENV_H
+#define _LIBFDT_ENV_H
+
+#include <stddef.h>
+#include <stdint.h>
+#include <string.h>
+
+#ifdef __CHECKER__
+#define __force __attribute__((force))
+#define __bitwise __attribute__((bitwise))
+#else
+#define __force
+#define __bitwise
+#endif
+
+typedef uint16_t __bitwise fdt16_t;
+typedef uint32_t __bitwise fdt32_t;
+typedef uint64_t __bitwise fdt64_t;
+
+#define EXTRACT_BYTE(x, n)	((unsigned long long)((uint8_t *)&x)[n])
+#define CPU_TO_FDT16(x) ((EXTRACT_BYTE(x, 0) << 8) | EXTRACT_BYTE(x, 1))
+#define CPU_TO_FDT32(x) ((EXTRACT_BYTE(x, 0) << 24) | (EXTRACT_BYTE(x, 1) << 16) | \
+                         (EXTRACT_BYTE(x, 2) << 8) | EXTRACT_BYTE(x, 3))
+#define CPU_TO_FDT64(x) ((EXTRACT_BYTE(x, 0) << 56) | (EXTRACT_BYTE(x, 1) << 48) | \
+                         (EXTRACT_BYTE(x, 2) << 40) | (EXTRACT_BYTE(x, 3) << 32) | \
+                         (EXTRACT_BYTE(x, 4) << 24) | (EXTRACT_BYTE(x, 5) << 16) | \
+                         (EXTRACT_BYTE(x, 6) << 8) | EXTRACT_BYTE(x, 7))
+
+static inline uint16_t fdt16_to_cpu(fdt16_t x)
+{
+        return (__force uint16_t)CPU_TO_FDT16(x);
+}
+static inline fdt16_t cpu_to_fdt16(uint16_t x)
+{
+        return (__force fdt16_t)CPU_TO_FDT16(x);
+}
+
+static inline uint32_t fdt32_to_cpu(fdt32_t x)
+{
+        return (__force uint32_t)CPU_TO_FDT32(x);
+}
+static inline fdt32_t cpu_to_fdt32(uint32_t x)
+{
+        return (__force fdt32_t)CPU_TO_FDT32(x);
+}
+
+static inline uint64_t fdt64_to_cpu(fdt64_t x)
+{
+        return (__force uint64_t)CPU_TO_FDT64(x);
+}
+static inline fdt64_t cpu_to_fdt64(uint64_t x)
+{
+        return (__force fdt64_t)CPU_TO_FDT64(x);
+}
+#undef CPU_TO_FDT64
+#undef CPU_TO_FDT32
+#undef CPU_TO_FDT16
+#undef EXTRACT_BYTE
+
+#endif /* _LIBFDT_ENV_H */
diff --git a/ext/libfdt/libfdt_internal.h b/ext/libfdt/libfdt_internal.h
new file mode 100644
index 000000000..9bccc154f
--- /dev/null
+++ b/ext/libfdt/libfdt_internal.h
@@ -0,0 +1,76 @@
+/*
+ * libfdt - Flat Device Tree manipulation
+ * Copyright (C) 2006 David Gibson, IBM Corporation.
+ *
+ *     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.
+ */
+#ifndef _LIBFDT_INTERNAL_H
+#define _LIBFDT_INTERNAL_H
+
+#include <fdt.h>
+
+#define FDT_ALIGN(x, a)		(((x) + (a) - 1) & ~((a) - 1))
+#define FDT_TAGALIGN(x)		(FDT_ALIGN((x), FDT_TAGSIZE))
+
+#define FDT_CHECK_HEADER(fdt) \
+        { \
+                int err; \
+                if ((err = fdt_check_header(fdt)) != 0) \
+                        return err; \
+        }
+
+int _fdt_check_node_offset(const void *fdt, int offset);
+int _fdt_check_prop_offset(const void *fdt, int offset);
+const char *_fdt_find_string(const char *strtab, int tabsize, const char *s);
+int _fdt_node_end_offset(void *fdt, int nodeoffset);
+
+static inline const void *_fdt_offset_ptr(const void *fdt, int offset)
+{
+        return (const char *)fdt + fdt_off_dt_struct(fdt) + offset;
+}
+
+static inline void *_fdt_offset_ptr_w(void *fdt, int offset)
+{
+        return (void *)(uintptr_t)_fdt_offset_ptr(fdt, offset);
+}
+
+static inline const struct fdt_reserve_entry *_fdt_mem_rsv(const void *fdt, int n)
+{
+        const struct fdt_reserve_entry *rsv_table =
+                (const struct fdt_reserve_entry *)
+                ((const char *)fdt + fdt_off_mem_rsvmap(fdt));
+
+        return rsv_table + n;
+}
+static inline struct fdt_reserve_entry *_fdt_mem_rsv_w(void *fdt, int n)
+{
+        return (void *)(uintptr_t)_fdt_mem_rsv(fdt, n);
+}
+
+#define FDT_SW_MAGIC		(~FDT_MAGIC)
+
+#endif /* _LIBFDT_INTERNAL_H */