6780e684d4
libfdt highlights since 1.4.3: - fdt_property_placeholder added to create a property without specifying its value at creation time - stringlist helper functions added to libfdt - Improved overlay support - Various internal cleanup Also switch stand/fdt over to using libfdt for overlay support with this update. Our current overlay implementation works only for limited use cases with overlays generated only by some specific versions of our dtc(1). Swap it out for the libfdt implementation, which supports any properly generated overlay being applied to a properly generated base. This will be followed up fairly soon with an update to dtc(1) in tree to properly generate overlays. MFC note: the <stdlib.h> include this update introduces in libfdt_env.h is apparently not necessary in the context we use this in. It's not immediately clear to me the motivation for it being introduced, but it came in with overlay support. I've left it in for the sake of accuracy and because it's not harmful here on HEAD, but MFC'ing this to stable/11 will require wrapping the #include in an `#ifndef _STANDALONE` block or else it will cause build failures. Tested on: Banana Pi-M3 (ARMv7) Tested on: Pine64 (aarch64) Tested on: PowerPC [nwhitehorn] Reviewed by: manu, nwhitehorn MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D13893
84 lines
2.8 KiB
C
84 lines
2.8 KiB
C
/*
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* libfdt - Flat Device Tree manipulation
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* Copyright (C) 2012 David Gibson, IBM Corporation.
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*
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* libfdt is dual licensed: you can use it either under the terms of
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* the GPL, or the BSD license, at your option.
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*
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* a) This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this library; if not, write to the Free
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* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*
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* Alternatively,
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*
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* b) Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* 1. Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "libfdt_env.h"
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#include <fdt.h>
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#include <libfdt.h>
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#include "libfdt_internal.h"
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int fdt_create_empty_tree(void *buf, int bufsize)
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{
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int err;
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err = fdt_create(buf, bufsize);
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if (err)
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return err;
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err = fdt_finish_reservemap(buf);
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if (err)
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return err;
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err = fdt_begin_node(buf, "");
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if (err)
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return err;
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err = fdt_end_node(buf);
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if (err)
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return err;
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err = fdt_finish(buf);
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if (err)
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return err;
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return fdt_open_into(buf, buf, bufsize);
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}
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