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#!/usr/bin/perl -w
# Find the start of physical memory
#
# Usage: ./$0 <DTB>
#
# Copyright (C) 2014 ARM Limited. All rights reserved.
#
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE.txt file.
use warnings;
use strict;
use FDT;
my $filename = shift;
die("No filename provided") unless defined($filename);
open (my $fh, "<:raw", $filename) or die("Unable to open file '$filename'");
my $fdt = FDT->parse($fh) or die("Unable to parse DTB");
my $root = $fdt->get_root();
# We assume the memory nodes and their reg entries are ordered by address.
my @mems = $root->find_by_device_type("memory");
my $mem = shift @mems;
die("Unable to find memory") unless defined($mem);
my ($addr, $size) = $mem->get_translated_reg(0);
die("Cannot find first memory bank") unless (defined($addr) && defined($size));
printf("0x%016x\n", $addr);
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