aboutsummaryrefslogtreecommitdiffstats
path: root/scripts/slugimage.pl
blob: da98c999e67f2167b9de91d74de508444278975b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
#!/usr/bin/perl
# 
# SlugImage : Manipulate NSLU2 firmware images
#             Dwayne Fontenot (jacques)
#             Rod Whitby (rwhitby)
#	      www.nslu2-linux.org
#
# Copyright (c) 2004, 2006, Dwayne Fontenot & Rod Whitby
# 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 NSLU2-Linux Development Team 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.
#

use strict;
use warnings;

use Getopt::Long qw(:config no_ignore_case);
use POSIX qw(tmpnam);

my($debug) = 0;
my($quiet) = 0;
my($flash_start)    = 0x50000000;
my($flash_len)      = 0x00800000;
my($block_size)     = 0x00020000;
my($kernel_offset)  = 0x00060000;
my($kernel_size)    = 0x00100000;
my($ramdisk_offset) = 0x00160000;
my(@cleanup);

# The last 70 bytes of the SercommRedBootTrailer (i.e. excluding MAC
# address).  Needed to create an image with an empty RedBoot partition
# since the Sercomm upgrade tool checks for this trailer.
# http://www.nslu2-linux.org/wiki/Info/SercommRedBootTrailer
my @sercomm_redboot_trailer = (0x4573, 0x4372, 0x4d6f, 0x006d, 0x0001,
       0x0400, 0x3170, 0x5895, 0x0010, 0x0000, 0x0000, 0x0000, 0x0000,
       0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
       0x0000, 0x0000, 0x0001, 0x0000, 0x0000, 0x0000, 0x0003, 0x2300,
       0x0063, 0x0000, 0x7320, 0x7245, 0x6f43, 0x6d4d);

# There's a 16 byte Sercomm trailer at the end of the flash. It is used
# by RedBoot to detect a Sercomm flash layout and to configure the
# Sercomm upgrade system.
# http://www.nslu2-linux.org/wiki/Info/SercommFlashTrailer
my @sercomm_flash_trailer = (0x0100, 0x0000, 0x6323, 0xf790, 0x5265,
                             0x4f63, 0x4d6d, 0xb400);

# Take $data, and pad it out to $total_len bytes, appending 0xff's.
sub padBytes {
    my($data,$total_len) = @_;

    # 0xFF is used to pad, as it's the erase value of the flash.
    my($pad_char) = pack("C",0xff);
    my($pad_len) = $total_len - length($data);

    # A request for negative padding is indicative of a logic error ...
    if (length($data) > $total_len) {
	die sprintf("padBytes error: data (%d) is longer than total_len (%d)", length($data), $total_len);
    }

    return $data . ($pad_char x $pad_len);
}

# Return the next multiple of block_size larger than or equal to $data_len.
sub paddedSize {
    my($data_len) = @_;

    use integer;
    return (($data_len - 1) / $block_size) * $block_size + $block_size;
}

# Return the number of block_size blocks required to hold $data_len.
sub numBlocks {
    my($data_len) = @_;

    use integer;
    return (($data_len - 1) / $block_size) + 1;
}

# Pack the name, address, size and optional skip regions of a partition entry into binary form.
sub createPartitionEntry {
    my($name, $flash_base, $size, $skips) = @_;
    my $entry;

    my($zero_long) = 0x0000;

    # Pack the partition entry according to the format that RedBoot (and the MTD partition parsing code) requires.
    $entry = pack("a16N5x212N2",$name,$flash_base,$zero_long,$size,$zero_long,$zero_long,$zero_long,$zero_long);

    # Optionally put a skip header into the padding area.
    if (defined $skips) {
	my $i = scalar(@$skips);
	foreach my $region (@$skips) {
	    substr($entry, -8 - 12*$i, 12) =
		pack("a4N2", "skip", $region->{'offset'}, $region->{'size'});
	    $i--;
	}
    }

    return $entry;
}

# Parse partition entry and return anon array ref [$name, $offset, $size, $skip] or return 0 on partition terminator.
sub parsePartitionEntry {
    my($partition_entry) = @_;

    my($entry_len) = 0x100;
    length($partition_entry) eq $entry_len or die "parsePartitionEntry: partition entry length is not $entry_len!\n";

    # Unpack the partition table entry, saving those values in which we are interested.
    my($name, $flash_base, $size, $dummy_long, $padding, $skips);
    ($name, $flash_base, $dummy_long, $size, $dummy_long, $dummy_long, $padding, $dummy_long, $dummy_long) =
	unpack("a16N5a212N2",$partition_entry);

    # A partition entry starting with 0xFF terminates the table.
    if (unpack("C", $name) eq 0xff) {
	# %%% FIXME: This should only skip, not terminate. %%%
	$debug and print "Found terminator for <FIS directory>\n";
	return 0;
    }

    # Remove trailing nulls from the partition name.
    $name =~ s/\000+//;

    # Extract the skip regions out of the padding area.
    $padding =~ s/^\000+//;
    $padding =~ s/\000*skip(........)\000*/$1/g;
    $padding =~ s/\000+$//;

    # Store the skip regions in an array for later use.
    while (length($padding)) {
	my $region = {};
	($region->{'offset'}, $region->{'size'}) =
	    unpack("N2", $padding);
	$debug and printf("Found skip region at 0x%05X, size 0x%05X\n",
			  $region->{'offset'}, $region->{'size'});
	push(@$skips, $region);
	$padding = substr($padding,8);
    }

    return [$name, $flash_base - $flash_start, $size, $skips];
}

# Return partition table from data is one exists, otherwise return 0.
sub findPartitionTable {
    my($data_buf) = @_;

    unpack("a7", $data_buf) eq 'RedBoot' or return 0;
    return substr($data_buf, 0, 0x1000)
}

# Parse partition table and return array of anonymous array references ([$name, $offset, $size, $skips], ...).
sub parsePartitionTable {
    my($partition_table) = @_;

    my(@partitions, $fields_ref);
    my($entry_len) = 0x100;
    my($partition_count) = 0;

    # Loop through the fixed size partition table entries, and store the entries in @partitions.
    # %%% FIXME: This doesn't handle the case of a completely full partition table. %%%
    while ($fields_ref = parsePartitionEntry(substr($partition_table, $partition_count * $entry_len, $entry_len))) {
	$debug and printf("Found <%s> at 0x%08X (%s)%s\n", $fields_ref->[0], $fields_ref->[1],
			  ($fields_ref->[2] >= $block_size ?
			   sprintf("%d blocks", numBlocks($fields_ref->[2])) :
			   sprintf("0x%05X bytes", $fields_ref->[2])),
			  (defined $fields_ref->[3] ?
			   sprintf(" [%s]",
				   join(", ",
					map { sprintf("0x%05X/0x%05X", $_->{'offset'},$_->{'size'}) }
					@{$fields_ref->[3]})) :
			   ""));
	$partitions[$partition_count++] = $fields_ref;
    }
    return(@partitions);
}

# Create an empty jffs2 block.
sub jffs2Block {
    return padBytes(pack("N3", 0x19852003, 0x0000000c, 0xf060dc98), $block_size);
}

# Write out $data to $filename,
sub writeOut {
    my($data, $filename) = @_;

    open FILE,">$filename" or die "Can't open file \"$filename\": $!\n";

    if (defined($data)) { print FILE $data;}

    close FILE or die "Can't close file \"$filename\": $!\n";
}

# Not used at the moment.
sub trailerData {
    my($product_id)       = 0x0001;
    my($protocol_id)      = 0x0000;
    my($firmware_version) = 0x2325;
    my($unknown1)         = 0x90f7;
    my($magic_number)     = 'eRcOmM';
    my($unknown2)         = 0x00b9;

    return pack("n4a6n",$product_id,$protocol_id,$firmware_version,$unknown1,$magic_number,$unknown2);
}

# Print the contents of the Sercomm RedBoot trailer.
sub printRedbootTrailer {
    my($redboot_data) = @_;

    my($correct_redboot_len) = 0x40000;
    my($redboot_data_len) = length($redboot_data);

    if ($redboot_data_len != $correct_redboot_len) {
	printf("Redboot length (0x%08X) is not 0x%08X\n", $redboot_data_len, $correct_redboot_len);
	return;
    }

    # The trailer is the last 80 bytes of the redboot partition.
    my($redboot_trailer) = substr($redboot_data, -80);

    writeOut($redboot_trailer, 'RedbootTrailer');

    my($mac_addr0, $mac_addr1, $mac_addr2, $unknown, $prefix, $ver_ctrl, $down_ctrl, $hid, $hver, $prodid, $prodidmask,
       $protid, $protidmask, $funcid, $funcidmask, $fver, $cseg, $csize, $postfix) =
	   unpack("n3Na7n2a32n10a7",$redboot_trailer);

    printf("MAC address is %04X%04X%04X\n", $mac_addr0, $mac_addr1, $mac_addr2);
    printf("unknown: %08X\n", $unknown);
    printf("%s:%04X:%04X:%s\n", $prefix, $ver_ctrl, $down_ctrl, $postfix);
    printf("VerControl: %04X\nDownControl: %04X\n", $ver_ctrl, $down_ctrl);
    printf("hid: %04X %04X %04X %04X %04X %04X %04X %04X %04X %04X %04X %04X %04X %04X %04X %04X\n", unpack("n16", $hid));
    printf("Hver: %04X\nProdID: %04X\nProtID: %04X\nFuncID: %04X\nFver: %04X\nCseg: %04X\nCsize: %04X\n",
	   $hver, $prodid, $protid, $funcid, $fver, $cseg, $csize);
}

# remove the optional Loader partition
sub removeOptionalLoader {
    my($partitions_ref) = @_;

    my $index;
    my $count = 0;
    map {
	if (not defined $index) {
	    if ($_->{'name'} eq "Loader") {
		$index = $count;
	    }
	    $count++;
	}
    } @$partitions_ref;
    
    defined $index or die "Cannot find the Loader partition\n";

    splice(@$partitions_ref, $index, 1);

    # Set fixed offsets and sizes for Kernel and Ramdisk
    map {
	if ($_->{'name'} eq 'Kernel') {
	    $_->{'offset'}   = $kernel_offset;
	    $_->{'size'}     = $kernel_size;
	    $_->{'variable'} = 0;
	}
	if ($_->{'name'} eq 'Ramdisk') {
	    $_->{'offset'}   = $ramdisk_offset;
	}
    } @$partitions_ref;

    return;
}


# populate @partitions based on the firmware's partition table
sub spliceFirmwarePartitions {
    my($firmware_buf, $partitions_ref) = @_;

    # we know that partition table, if it exists, begins at start of 'FIS directory' and has max length 0x1000
    my($partition_table);
    map {
	$_->{'name'} eq 'FIS directory' and
	    $partition_table = findPartitionTable(substr($firmware_buf, $_->{'offset'}, $_->{'size'}));
    } @$partitions_ref;

    # return 0 here if no partition table in FIS directory
    return if not $partition_table;

    my @new_partitions = parsePartitionTable($partition_table);

    # Remove the optional second stage bootloader if it is not found in the FIS directory.
    if (not grep { $_->[0] eq 'Loader' } @new_partitions) {
	removeOptionalLoader($partitions_ref);
    }

    my($partition_count) = 0;
    my($splice) = 0;
    map {

	# Skip pseudo partitions.
	while (($partition_count < scalar(@$partitions_ref)) and
	       $partitions_ref->[$partition_count]->{'pseudo'}) {
	    $debug and printf("Skipped <%s> (pseudo partition)\n", $partitions_ref->[$partition_count]->{'name'});
	    $partition_count++;
	}

	# If we are in a variable area, and we haven't reached the end of it,
	# then splice in another partition for use by the later code.
	if ($splice and ($partitions_ref->[$partition_count]->{'name'} ne $_->[0])) {
	    $debug and printf("Splicing new partition <%s> before <%s>\n",
			      $_->[0], $partitions_ref->[$partition_count]->{'name'});
	    splice(@{$partitions_ref}, $partition_count, 0, ({'name' => "",'variable'=>1,'header'=>0}));
	}

	my $partition = $partitions_ref->[$partition_count];

	# Variable partitions can be overridden by the real FIS directory
	if ($partition->{'variable'}) {

	    # Only override the filename if the partition name is not set or doesn't match
	    if ($partition->{'name'} ne $_->[0]) {

		if (length($partition->{'name'})) {
		    $debug and printf("Overwriting <%s> with <%s>\n",
				      $partitions_ref->[$partition_count]->{'name'}, $_->[0]);
		}

		$partition->{'name'} = $_->[0];
		$partition->{'file'} = $_->[0];
	    }

	    # Set the offset, size and skips based on the real partition table
	    $partition->{'offset'} = $_->[1];
	    $partition->{'size'}   = $_->[2];
	    $partition->{'skips'}  = $_->[3];

	    $debug and printf("Locating <%s> at 0x%08X (%s)\n",
			      $partition->{'name'}, $partition->{'offset'},
			      ($partition->{'size'} >= $block_size ?
			       sprintf("%d blocks", numBlocks($partition->{'size'})) :
			       sprintf("0x%05X bytes", $partition->{'size'})));

	    $splice = 1;
	}

	# Fixed partitions cannot be overridden
	else {
	    ($partition->{'name'} eq $_->[0]) or
		die "Unexpected partition <",$_->[0],"> (expecting <",$partition->{'name'},">)\n";

	    $debug and printf("Locating <%s> at 0x%08X (%s)\n",
			      $partition->{'name'}, $partition->{'offset'},
			      ($partition->{'size'} >= $block_size ?
			       sprintf("%d blocks", numBlocks($partition->{'size'})) :
			       sprintf("0x%05X bytes", $partition->{'size'})));
	    
	    $splice = 0;
	}
	
	$partition_count++;

    } @new_partitions;

    return;
}

# Read in an 8MB firmware file, and store the data into @partitions.
# Note that the data is only stored in a partition if 'offset' and 'size' are defined,
# and it does not already have data stored in it.
sub readInFirmware {
    my($filename, $partitions_ref) = @_;

    my($firmware_buf);
    my($total_length)   = 0x800000;

    open FILE,$filename or die "Can't find firmware image \"$filename\": $!\n";
    read FILE,$firmware_buf,$total_length or die "Can't read $total_length bytes from \"$filename\": $!\n";
    close FILE or die "Can't close \"$filename\": $!\n";

    $debug and printf("Read 0x%08X bytes from \"%s\"\n", length($firmware_buf), $filename);

    spliceFirmwarePartitions($firmware_buf, $partitions_ref);

    # Read the parts of the firmware file into the partitions table.
    map {
	if (defined $_->{'offset'} and defined $_->{'size'}) {

	    if (defined $_->{'data'}) {
		$debug and printf("Not overwriting data in <%s>\n", $_->{'name'});
	    }
	    else {

		# Slurp up the data, based on whether a header and/or data is present or not
		if ($_->{'header'}) {

		    # Read the length, and grab the data based on the length.
		    my($data_len) = unpack("N", substr($firmware_buf, $_->{'offset'}));

		    # A length of 0xFFFFFFFF means that the area is not initialised
		    if ($data_len != 0xFFFFFFFF) {
			$debug and printf("Found header size of 0x%08X bytes for <%s>\n", $data_len, $_->{'name'});
			$_->{'data'} = substr($firmware_buf, $_->{'offset'} + $_->{'header'}, $data_len);
		    }
		}
		elsif ($_->{'pseudo'} and not defined $_->{'file'} and
		       (substr($firmware_buf, $_->{'offset'}, $_->{'size'}) eq
			(pack("C", 0xff) x $_->{'size'}))) {
		    $debug and printf("Skipping empty pseudo partition <%s>\n", $_->{'name'});
		}
		else {

		    # Grab the whole partition, using the maximum size.
		    $_->{'data'} = substr($firmware_buf, $_->{'offset'}, $_->{'size'});
		}

		# If skip regions are defined, remove them from the data.
		if (defined $_->{'skips'}) {
		    my $removed = 0;
		    foreach my $region (@{$_->{'skips'}}) {
			if (($region->{'offset'} > 0) or
			    not ($_->{'header'} > 0)) {
			    $debug and printf("Removing 0x%05X bytes from offset 0x%05X\n",
					      $region->{'size'}, $region->{'offset'});
			    $region->{'data'} = substr($_->{'data'}, $region->{'offset'} - $removed, $region->{'size'}, '');
			}
			$removed += $region->{'size'};
		    }
		}

		$quiet or defined $_->{'data'} and printf("Read %s into <%s>\n",
							  (length($_->{'data'}) >= $block_size ?
							   sprintf("%d blocks", numBlocks(length($_->{'data'}))) :
							   sprintf("0x%05X bytes", length($_->{'data'}))), $_->{'name'});
	    }
	}
    } @$partitions_ref;
}

# Write the partition data stored in memory out into the files associated with each.
sub writeOutFirmwareParts {
    my(@partitions) = @_;

    # Write out the parts of the firmware file.
    map {

	# We can only write if 'data' and 'file' are defined.
	if (defined $_->{'file'} and defined $_->{'data'} and length($_->{'data'})) {
	    writeOut($_->{'data'}, $_->{'file'});
	    $quiet or printf("Wrote 0x%08X bytes from <%s> into \"%s\"\n",
			      length($_->{'data'}), $_->{'name'}, $_->{'file'});
	}
	else {
	    $debug and printf("Skipping <%s> (%s)\n", $_->{'name'},
			      (not defined $_->{'file'}) ?
			      "no filename specified" :
			      "no data to write");
	}

    } @partitions;

    return;
}

# Read in the partition data from the files associated with each and store in memory.
sub readInFirmwareParts {
    my(@partitions) = (@_);
    
    undef $/; # we want to slurp

    map {

	my $file = $_->{'file'};
	if (defined $file) {
	    open FILE,$file or die "Can't find firmware part \"$file\": $!\n";

	    # Slurp in the data
	    $_->{'data'} = <FILE>;

	    # close the file
	    close FILE or die "Can't close file \"$file\": $!\n";

	    # Optionally byteswap the data
	    if ($_->{'byteswap'}) {
		# Byte swap the data (which has to be padded to a multiple of 4 bytes).
		$_->{'data'} = pack("N*", unpack("V*", $_->{'data'}.pack("CCC", 0)));
	    }

	    # Keep track of the actual size.
	    my $size;

	    if ($_->{'header'}) {
		if ($_->{'pseudo'}) {
		    $size = $_->{'header'} + length($_->{'data'});
		}
		else {
		    $size = paddedSize($_->{'header'} + length($_->{'data'}));
		}
	    }
	    elsif (not $_->{'pseudo'}) {
		$size = paddedSize(length($_->{'data'}));
	    }
	    else {
		$size = length($_->{'data'});
	    }

	    # Check to make sure the file contents are not too large.
	    if (defined $_->{'size'} and ($size > $_->{'size'})) {
		die sprintf("Ran out of flash space in <%s> - %s too large.\n", $_->{'name'},
			    sprintf("0x%05X bytes", ($size - $_->{'size'})));
	    }

	    # If the partition does not have a fixed size, the calculate the size.
	    if (not defined $_->{'size'}) {
		$_->{'size'} = $size;
	    }

	    # Keep the user appraised ...
	    $quiet or printf("Read 0x%08X bytes from \"%s\" into <%s> (%s / %s)%s\n",
			     length($_->{'data'}), $_->{'file'}, $_->{'name'},
			     ($size >= $block_size ?
			      sprintf("%d blocks", numBlocks($size)) :
			      sprintf("0x%05X bytes", $size)),
			     ($_->{'size'} >= $block_size ?
			      sprintf("%d blocks", numBlocks($_->{'size'})) :
			      sprintf("0x%05X bytes", $_->{'size'})),
			     ($_->{'byteswap'} ? " (byte-swapped)" : ""));
	}

    } @partitions;

    return;
}

# layoutPartitions : this function must be ugly - it needs to verify RedBoot, SysConf, Kernel, Ramdisk, and
#     FIS directory partitions exist, are in the correct order, and do not have more data than can fit in
#     their lengths (fixed for all but Ramdisk, which has a minimum length of one block).
#     If Rootdisk and/or Userdisk exist, it must also verify that their block padded lengths are not
#     too great for the available space.
# input : an array of hashes, some of which are populated with data
# output: same reference with start and size (partition not data) also populated. this populated structure
#         can then be passed to buildPartitionTable() to generate the actual partition table data
sub layoutPartitions {
    my(@partitions) = @_;

    # Find the kernel partition, and save a pointer to it for later use
    my $kernel;
    map { ($_->{'name'} eq "Kernel") && ($kernel = $_); } @partitions;
    $kernel or die "Couldn't find the kernel partition\n";

    # Find the last variable size partition, and save a pointer to it for later use
    my $lastdisk;
    my $directory_offset;
    my $curdisk = $partitions[0];
    map {
	if (not defined $lastdisk) {
	    if ($_->{'name'} eq "FIS directory") {
		$lastdisk = $curdisk;
		$directory_offset = $_->{'offset'};
	    }
	    else {
		$curdisk = $_;
	    }
	}
    } @partitions;

    $lastdisk or die "Couldn't find the last variable size partition\n";

    $debug and printf("Last variable size partition is <%s>\n", $lastdisk->{'name'});

    #
    # here we go through the $partitions array ref and fill in all the values
    #

    # This points to where the next partition should be placed.
    my $pointer = $flash_start;

    map {

	$debug and printf("Pointer is 0x%08X\n", $pointer);

	# Determine the start and offset of the current partition.
	if (defined $_->{'offset'}) {
	    $_->{'start'} = $flash_start + $_->{'offset'};
	    # Check for running past the defined start of the partition.
	    if (($pointer > $_->{'start'}) and not $_->{'pseudo'}) {
		die sprintf("Ran out of flash space before <%s> - %s too large.\n", $_->{'name'},
			    sprintf("0x%05X bytes", ($pointer - $_->{'start'})));
	    }
	}

	# If offset is not defined, then calculate it.
	else {
	    $_->{'start'} = $pointer;
	    $_->{'offset'} = $_->{'start'} - $flash_start;
	}

	my $size = defined $_->{'data'} ? length($_->{'data'}) : 0;

	# Add skip regions for the partitions with headers.
	if ($_->{'header'} > 0) {
	    # Define the skip region for the initial Sercomm header.
	    push(@{$_->{'skips'}},
		 { 'offset' => 0, 'size' => $_->{'header'}, 'data' => undef });
	    # Allow for the Sercomm header to be prepended to the data.
	    $size += $_->{'header'};

	    # Determine if the partition overlaps the ramdisk boundary.
	    if (($_->{'offset'} < $ramdisk_offset) and
		(($_->{'offset'} + $size) > $ramdisk_offset)) {
		# Define the skip region for the inline Sercomm header.
		push(@{$_->{'skips'}},
		     { 'offset' => ($ramdisk_offset - $_->{'offset'}), 'size' => 16,
		       'data' => pack("N4", $block_size) });
		# Allow for the Sercomm header to be inserted in the data.
		$size += 16;
	    }
	}

	# Partitions without headers cannot have skip regions.
	elsif (($_->{'offset'} <= $ramdisk_offset) and
	       (($_->{'offset'} + $size) > $ramdisk_offset)) {
	    # Pad the kernel until it extends past the ramdisk offset.
	    push(@{$kernel->{'skips'}},
		 { 'offset' => ($ramdisk_offset - $kernel->{'offset'}), 'size' => 16,
		   'data' => pack("N4", $block_size) });
	    $kernel->{'size'} = $ramdisk_offset - $kernel->{'offset'} + $block_size;
	    $kernel->{'data'} = padBytes($kernel->{'data'},
					 $kernel->{'size'} - $kernel->{'header'} - 16);
	    $_->{'offset'} = $ramdisk_offset + $block_size;
	    $_->{'start'} = $flash_start + $_->{'offset'};
	    $pointer = $_->{'start'};
	    $debug and printf("Extending kernel partition past ramdisk offset.\n");
	}

	# If this is the last variable size partition, then fill the rest of the space.
	if ($_->{'name'} eq $lastdisk->{'name'}) {
	    $_->{'size'} = paddedSize($directory_offset + $flash_start - $pointer);
	    $debug and printf("Padding last variable partition <%s> to 0x%08X bytes\n", $_->{'name'}, $_->{'size'});
	}

	die sprintf("Partition size not defined in <%s>.\n", $_->{'name'})
	    unless defined $_->{'size'};

	# Extend to another block if required.
	if ($size > $_->{'size'}) {
	    if ($_->{'name'} eq $lastdisk->{'name'}) {
		die sprintf("Ran out of flash space in <%s> - %s too large.\n", $_->{'name'},
			    sprintf("0x%05X bytes", ($size - $_->{'size'})));
	    }
	    $_->{'size'} = $size;
	    printf("Extending partition <%s> to 0x%08X bytes\n", $_->{'name'}, $_->{'size'});
	}

	# Keep the user appraised ...
	$debug and printf("Allocated <%s> from 0x%08X to 0x%08X (%s / %s)\n",
			  $_->{'name'}, $_->{'start'}, $_->{'start'} + $_->{'size'},
			  ($size >= $block_size ?
			   sprintf("%d blocks", numBlocks($size)) :
			   sprintf("0x%05X bytes", $size)),
			  ($_->{'size'} >= $block_size ?
			   sprintf("%d blocks", numBlocks($_->{'size'})) :
			   sprintf("0x%05X bytes", $_->{'size'})));

	# Check to make sure we have not run out of room.
	if (($_->{'start'} + $_->{'size'}) > ($flash_start + $flash_len)) {
	    die "Ran out of flash space in <", $_->{'name'}, ">\n";
	}

	$debug and printf("Moving pointer from 0x%08X to 0x%08X (0x%08X + 0x%08X)\n",
			  $pointer, paddedSize($_->{'start'} + $_->{'size'}),
			  $_->{'start'}, $_->{'size'});

	# Move the pointer up, in preparation for the next partition.
	$pointer = paddedSize($_->{'start'} + $_->{'size'});

    } @partitions;

    return;
}

sub buildPartitionTable {
    my(@partitions) = @_;

    my($flash_start) = 0x50000000;
    my($partition_data) = '';

    map {

	# Collate the partition data for all known partitions.
	if (not $_->{'pseudo'} and defined $_->{'offset'} and defined $_->{'size'}) {

	    # Pack and append the binary table entry for this partition.
	    $partition_data .= createPartitionEntry($_->{'name'}, $_->{'offset'} + $flash_start,
						    $_->{'size'}, $_->{'skips'});

	    # If this is the FIS directory, then write the partition table data into it.
	    if ($_->{'name'} eq "FIS directory") {
		# Explicitly terminate the partition data.
		$partition_data .= pack("C",0xff) x 0x100;
		$_->{'data'} = padBytes($partition_data, $_->{'size'});
	    }

	    my $size = length($_->{'data'});

	    # Keep the user appraised ...
	    $debug and printf("Table entry <%s> from 0x%08X to 0x%08X (%s / %s)%s\n",
			      $_->{'name'}, $_->{'start'}, $_->{'start'} + $_->{'size'},
			      ($size >= $block_size ?
			       sprintf("%d blocks", numBlocks($size)) :
			       sprintf("0x%05X bytes", $size)),
			      ($_->{'size'} >= $block_size ?
			       sprintf("%d blocks", numBlocks($_->{'size'})) :
			       sprintf("0x%05X bytes", $_->{'size'})),
			      (defined $_->{'skips'} ?
			       sprintf("\nTable entry <%s> skip %s", $_->{'name'},
				       join(", ",
					    map { sprintf("0x%08X to 0x%08X", $_->{'offset'},
							  $_->{'offset'} + $_->{'size'} - 1) }
					    @{$_->{'skips'}})) :
			       "")
			      );
	}
	else {
	    $debug and print "No table entry required for <", $_->{'name'}, ">\n";
	}

    } @partitions;

    return;
}

sub writeOutFirmware {
    my($filename, @partitions) = @_;

    # Clear the image to start.
    my $image_buf = "";

    map {

	# We can only write a partition if it has an offset, a size, and some data to write.
	if (defined $_->{'offset'} and defined $_->{'size'} and defined $_->{'data'}) {

	    # Keep track of the end of the image.
	    my $end_point = length($image_buf);

	    # If the next partition is well past the end of the current image, then pad it.
	    if ($_->{'offset'} > $end_point) {
		$image_buf .= padBytes("", $_->{'offset'} - $end_point);
		$quiet or printf("Padded %s before <%s> in \"%s\"\n",
				 ((length($image_buf) - $end_point) >= $block_size ?
				  sprintf("%d blocks", numBlocks(length($image_buf) - $end_point)) :
				  sprintf("0x%05X bytes", length($image_buf) - $end_point)),
				 $_->{'name'}, $filename);
	    }

	    # If the next parition is before the end of the current image, then rewind.
	    elsif ($_->{'offset'} < $end_point) {
		$debug and printf("Rewound %s before <%s> in \"%s\"\n",
				  (($end_point - $_->{'offset'}) >= $block_size ?
				   sprintf("%d blocks", numBlocks($end_point - $_->{'offset'})) :
				   sprintf("0x%05X bytes", $end_point - $_->{'offset'})),
				  $_->{'name'}, $filename);
# 		if (($end_point - $_->{'offset'}) >= $block_size) {
# 		    die "Allocation error: rewound a full block or more ...\n";
# 		}
	    }

	    # If skip regions are defined, add them to the data.
	    if (defined $_->{'skips'}) {
		my $added = 0;
		foreach my $region (@{$_->{'skips'}}) {
		    if (($region->{'offset'} > 0) or
			not ($_->{'header'} > 0)) {
			$debug and printf("Inserted 0x%05X bytes (at offset 0x%05X) into <%s>\n",
					  $region->{'size'}, $region->{'offset'}, $_->{'name'});
			substr($_->{'data'},
			       $region->{'offset'} + $added - $_->{'header'},
			       0, $region->{'data'});
			$added += $region->{'size'};
		    }
		}
	    }

	    # Splice the data into the image at the appropriate place, padding as required.
	    substr($image_buf, $_->{'offset'}, $_->{'size'},
		   $_->{'header'} ?
		   padBytes(pack("N4",length($_->{'data'})).$_->{'data'}, $_->{'size'}) :
		   padBytes($_->{'data'}, $_->{'size'}));
	    
	    # Keep the user appraised ...
	    $quiet or printf("Wrote %s (0x%08X to 0x%08X) from <%s> into \"%s\"\n",
			     ($_->{'size'} >= $block_size ?
			      sprintf("%2d blocks", numBlocks($_->{'size'})) :
			      sprintf("0x%05X bytes", $_->{'size'})),
			     $_->{'offset'}, $_->{'offset'}+$_->{'size'}, $_->{'name'}, $filename);
	}

	# If we are not able to write a partition, then give debug information about why.
	else {
	    $debug and printf("Skipping <%s> (%s)\n", $_->{'name'},
			      (not defined $_->{'offset'}) ? "no offset defined" :
			      ((not defined $_->{'size'}) ? "no size defined" :
			       "no data available"));
	}

    } @partitions;

    # Write the image to the specified file.
    writeOut($image_buf, $filename);

    return;
}

# checkPartitionTable: sanity check partition table - for testing but might evolve into setting @partitions
#    so that we can write out jffs2 partitions from a read image
#    currently not nearly paranoid enough
sub checkPartitionTable {
    my($data) = @_;

    my($pointer) = 0;
    my($entry);

    my($name, $flash_base, $size, $done, $dummy_long, $padding);
    do {
	$entry = substr($data, $pointer, 0x100);

	($name,$flash_base,$dummy_long,$size,$dummy_long,$dummy_long,$padding,$dummy_long,$dummy_long) = unpack("a16N5x212N2",$entry);
	$name =~ s/\0//g;
	$debug and printf("pointer: %d\tname: %s%sflash_base: 0x%08X\tsize: 0x%08X\n",
			  $pointer, $name, (" " x (16 - length($name))), $flash_base, $size);
	$pointer += 0x100;
	$debug and printf("terminator: 0x%08X\n", unpack("C", substr($data, $pointer, 1)));
	if (unpack("C", substr($data, $pointer, 1)) eq 0xff) {
	    $done = 1;
	}
    } until $done;
}

sub printPartitions {
    my(@partitions) = @_;

    my($offset, $size, $skips);
    map {
#	defined $_->{'size'} ? $size = $_->{'size'} : $size = undef;

	if (defined  $_->{'size'}) {
	    $size = $_->{'size'};
	}
	else {
	    $size = undef;
	}
	if (defined  $_->{'offset'}) {
	    $offset = $_->{'offset'};
	}
	else {
	    $offset = undef;
	}
	if (defined  $_->{'skips'}) {
	    $skips = $_->{'skips'};
	}
	else {
	    $skips = undef;
	}
	printf("%s%s", $_->{'name'}, (" " x (16 - length($_->{'name'}))));
	if (defined $offset) { printf("0x%08X\t", $offset); } else { printf("(undefined)\t");   };
	if (defined $size)   { printf("0x%08X", $size); } else { printf("(undefined)"); };
	if (defined $skips) {
	    printf("\t[%s]",
		   join(", ",
			map { sprintf("0x%05X/0x%05X", $_->{'offset'}, $_->{'size'}); }
			@$skips));
	}
	printf("\n");
    } @partitions;
}

sub defaultPartitions {

    return ({'name'=>'RedBoot',          'file'=>'RedBoot',
	     'offset'=>0x00000000,        'size'=>0x00040000,
	     'variable'=>0, 'header'=>0,  'pseudo'=>0, 'data'=>undef, 'byteswap'=>0},
	    {'name'=>'EthAddr',           'file'=>undef,
	     'offset'=>0x0003ffb0,        'size'=>0x00000006,
	     'variable'=>0, 'header'=>0,  'pseudo'=>1, 'data'=>undef, 'byteswap'=>0},
	    {'name'=>'SysConf',           'file'=>'SysConf',
	     'offset'=>0x00040000,        'size'=>0x00020000,
	     'variable'=>0, 'header'=>0,  'pseudo'=>0, 'data'=>undef, 'byteswap'=>0},
	    {'name'=>'Loader',            'file'=>'apex.bin',
	     'offset'=>undef,             'size'=>undef,
	     'variable'=>1, 'header'=>16, 'pseudo'=>0, 'data'=>undef, 'byteswap'=>0},
	    {'name'=>'Kernel',            'file'=>'vmlinuz',
	     'offset'=>undef,             'size'=>undef,
	     'variable'=>1, 'header'=>16, 'pseudo'=>0, 'data'=>undef, 'byteswap'=>0},
	    {'name'=>'Ramdisk',           'file'=>'ramdisk.gz',
	     'offset'=>undef,             'size'=>undef,
	     'variable'=>1, 'header'=>16, 'pseudo'=>0, 'data'=>undef, 'byteswap'=>0},
	    {'name'=>'FIS directory',     'file'=>undef,
	     'offset'=>0x007e0000,        'size'=>0x00020000,
	     'variable'=>0, 'header'=>0,  'pseudo'=>0, 'data'=>undef, 'byteswap'=>0},
	    {'name'=>'Loader config',	  'file'=>undef,
	     'offset'=>0x007f8000,        'size'=>0x00004000,
	     'variable'=>0, 'header'=>0,  'pseudo'=>1, 'data'=>undef, 'byteswap'=>0},
	    {'name'=>'Microcode',	  'file'=>'NPE-B',
	     'offset'=>0x007fc000,        'size'=>0x00003000,
	     'variable'=>0, 'header'=>16, 'pseudo'=>1, 'data'=>undef, 'byteswap'=>0},
	    {'name'=>'Trailer',           'file'=>'Trailer',
	     'offset'=>0x007ffff0,        'size'=>0x00000010,
	     'variable'=>0, 'header'=>0,  'pseudo'=>1, 'data'=>undef, 'byteswap'=>0});
}

# Main routine starts here ...

my($unpack, $pack, $little, $input, $output, $redboot);
my($kernel, $sysconf, $ramdisk, $fisdir);
my($microcode, $trailer, $ethaddr, $loader);

END {
    # Remove temporary files
    for my $file (@cleanup) {
	unlink $file;
    }
}

if (!GetOptions("d|debug"       => \$debug,
		"q|quiet"       => \$quiet,
		"u|unpack"      => \$unpack,
		"p|pack"        => \$pack,
		"l|little"      => \$little,
		"i|input=s"     => \$input,
		"o|output=s"    => \$output,
		"b|redboot=s"   => \$redboot,
		"k|kernel=s"    => \$kernel,
		"s|sysconf=s"   => \$sysconf,
		"r|ramdisk=s"   => \$ramdisk,
		"f|fisdir=s"    => \$fisdir,
		"m|microcode=s" => \$microcode,
		"t|trailer=s"   => \$trailer,
		"e|ethaddr=s"   => \$ethaddr,
		"L|loader=s"    => \$loader,
		) or (not defined $pack and not defined $unpack)) {
    print "Usage: slugimage <options>\n";
    print "\n";
    print "  [-d|--debug]			Turn on debugging output\n";
    print "  [-q|--quiet]			Turn off status messages\n";
    print "  [-u|--unpack]			Unpack a firmware image\n";
    print "  [-p|--pack]			Pack a firmware image\n";
    print "  [-l|--little]			Convert Kernel and Ramdisk to little-endian\n";
    print "  [-i|--input]     <file>		Input firmware image filename\n";
    print "  [-o|--output]    <file>		Output firmware image filename\n";
    print "  [-b|--redboot]   <file>		Input/Output RedBoot filename\n";
    print "  [-s|--sysconf]   <file>		Input/Output SysConf filename\n";
    print "  [-L|--loader]    <file>		Second stage boot loader filename\n";
    print "  [-k|--kernel]    <file>		Input/Ouptut Kernel filename\n";
    print "  [-r|--ramdisk]   <file>		Input/Output Ramdisk filename(s)\n";
    print "  [-f|--fisdir]    <file>		Input/Output FIS directory filename\n";
    print "  [-m|--microcode] <file>		Input/Output Microcode filename\n";
    print "  [-t|--trailer]   <file>		Input/Output Trailer filename\n";
    print "  [-e|--ethaddr]   <AABBCCDDEEFF>	Set the Ethernet address\n";

    # %%% TODO %%% Document --ramdisk syntax

    exit 1;
}

my(@partitions) = defaultPartitions();

if ($pack) {
    die "Output filename must be specified\n" unless defined $output;

    # If we're creating an image and no RedBoot, SysConf partition is
    # explicitly specified, simply write an empty one as the upgrade tools
    # don't touch RedBoot and SysConf anyway.  If no Trailer is specified,
    # put in one.
    if (not defined $redboot and not -e "RedBoot") {
	$redboot = tmpnam();
	open TMP, ">$redboot" or die "Cannot open file $redboot: $!";
	push @cleanup, $redboot;
	# The RedBoot partition is 256 * 1024 = 262144; the trailer we add
	# is 70 bytes.
	print TMP "\0"x(262144-70);
	# Upgrade tools check for an appropriate Sercomm trailer.
	for my $i (@sercomm_redboot_trailer) {
	    print TMP pack "S", $i;
	}
	close TMP;
    }
    if (not defined $sysconf and not -e "SysConf") {
	$sysconf = tmpnam();
	open TMP, ">$sysconf" or die "Cannot open file $sysconf: $!";
	push @cleanup, $sysconf;
	# The SysConf partition is 128 * 1024 = 131072
	print TMP "\0"x131072;
	close TMP;
    }
    if (not defined $trailer and not -e "Trailer") {
	$trailer = tmpnam();
	open TMP, ">$trailer" or die "Cannot open file $trailer: $!";
	push @cleanup, $trailer;
	for my $i (@sercomm_flash_trailer) {
	    print TMP pack "S", $i;
	}
	close TMP;
    }

    # If the microcode was not specified, then don't complain that it's missing.
    if (not defined $microcode and not -e "NPE-B") {
	map { ($_->{'name'} eq 'Microcode') && ($_->{'file'} = undef);   } @partitions;
    }
}

# Go through the partition options, and set the names and files in @partitions
if (defined $redboot)   { map { ($_->{'name'} eq 'RedBoot')	  && ($_->{'file'} = $redboot);   } @partitions; }
if (defined $sysconf)   { map { ($_->{'name'} eq 'SysConf')	  && ($_->{'file'} = $sysconf);   } @partitions; }
if (defined $loader)    { map { ($_->{'name'} eq 'Loader')	  && ($_->{'file'} = $loader);    } @partitions; }
if (defined $kernel)    { map { ($_->{'name'} eq 'Kernel')	  && ($_->{'file'} = $kernel);    } @partitions; }
if (defined $fisdir)    { map { ($_->{'name'} eq 'FIS directory') && ($_->{'file'} = $fisdir);    } @partitions; }
if (defined $microcode) { map { ($_->{'name'} eq 'Microcode')	  && ($_->{'file'} = $microcode); } @partitions; }
if (defined $trailer)   { map { ($_->{'name'} eq 'Trailer')	  && ($_->{'file'} = $trailer);   } @partitions; }

if (defined $little)  {
    map {
	if (($_->{'name'} eq 'Loader') or
	    ($_->{'name'} eq 'Kernel') or
	    ($_->{'name'} eq 'Ramdisk')) {
	    $_->{'byteswap'} = 1;
	}
    } @partitions;
}

if (defined $ethaddr) {
    map {
	if ($_->{'name'} eq 'EthAddr') {
	    $ethaddr =~ s/://g;
	    if (($ethaddr !~ m/^[0-9A-Fa-f]+$/) or (length($ethaddr) != 12)) {
		die "Invalid ethernet address specification: '".$ethaddr."'\n";
	    }
	    $_->{'data'} = pack("H12", $ethaddr);
	}
    } @partitions;
}

if (defined $ramdisk) {

    # A single filename is used for the ramdisk filename
    if ($ramdisk !~ m/[:,]/) {
	map { ($_->{'name'} eq 'Ramdisk') && ($_->{'file'} = $ramdisk); } @partitions;
    }

    # otherwise, it's a list of name:file mappings
    else {
	my @mappings = split(',', $ramdisk);

	# Find the index of the Ramdisk entry
	my $index;
	my $count = 0;
	map {
	    if (not defined $index) {
		if ($_->{'name'} eq "Ramdisk") {
		    $index = $count;
		}
		$count++;
	    }
	} @partitions;

	defined $index or die "Cannot find the Ramdisk partition\n";

	# Replace the Ramdisk entry with the new mappings
	splice(@partitions, $index, 1, map {

	    # Preserve the information from the ramdisk entry
	    my %entry = %{$partitions[$index]};

	    # Parse the mapping
	    ($_ =~ m/^([^:]+):([^:]+)(:([^:]+))?$/) or die "Invalid syntax in --ramdisk\n";
	    $entry{'name'} = $1; $entry{'file'} = $2; my $size = $4;

	    # If the mapping is not for the ramdisk, then undefine its attributes
	    if ($entry{'name'} ne 'Ramdisk') {
		$entry{'offset'} = undef;
		$entry{'size'} = undef;
		$entry{'variable'} = 1;
		$entry{'header'} = 0;
		$entry{'pseudo'} = 0;
		$entry{'data'} = undef;
		$entry{'byteswap'} = 0;
	    }

	    # Support specification of the number of blocks for empty jffs2
	    if ($entry{'file'} =~ m/^[0-9]+$/) {
		$size = $entry{'file'};
		$entry{'file'} = undef;
	    }

	    # If the user has specified a size, then respect their wishes
	    if (defined $size) {
		$entry{'size'} = $size * $block_size;
		# Create an empty partition of the requested size.
		$entry{'data'} = padBytes("", $entry{'size'} - $entry{'header'});
	    }

	    \%entry;

	} @mappings);
    }
}

# Read in the firmware image
if ($input) {
    if ($debug) {
	print "Initial partition map:\n";
	printPartitions(@partitions);
    }
    
    my $result = readInFirmware($input, \@partitions);

    if ($debug) {
	print "After reading firmware:\n";
	printPartitions(@partitions);
    }
}

# Unpack the firmware if requested
if ($unpack) {
    die "Input filename must be specified\n" unless defined $input;

#    map {
#	($_->{'name'} eq 'FIS directory') and @partitions = checkPartitionTable($_->{'data'});
#    } @partitions;

    writeOutFirmwareParts(@partitions);

}

# Pack the firmware if requested
if ($pack) {

    if (!defined $loader) {
	removeOptionalLoader(\@partitions);
    }

    if ($debug) {
	print "Initial partition map:\n";
	printPartitions(@partitions);
    }
    
    my $result = readInFirmwareParts(@partitions);

    if ($debug) {
	print "after readInFirmwareParts():\n";
	printPartitions(@partitions);
# 	map {
# 	    ($_->{'name'} eq 'RedBoot') && (printRedbootTrailer($_->{'data'}));
# 	} @partitions;
    }
    
    layoutPartitions(@partitions);

    if ($debug) {
 	print "after layoutPartitions():\n";
 	printPartitions(@partitions);
    }
    
    buildPartitionTable(@partitions);

    if ($debug) {
 	print "after buildPartitionTable():\n";
 	printPartitions(@partitions);

#  	my($lastblock);
#  	map {
#  	    if ($_->{'name'} eq 'FIS directory') {
#  		$lastblock = $_->{'data'};
#  	    }
#  	} @partitions;

#  	print "checkPartitionTable():\n";
#  	checkPartitionTable($lastblock);
    }
    
    writeOutFirmware($output, @partitions);

}

exit 0;