File: dummyflasher.c

package info (click to toggle)
flashrom 0.9.9+r1954-1
  • links: PTS
  • area: main
  • in suites: stretch
  • size: 3,088 kB
  • ctags: 3,796
  • sloc: ansic: 41,326; makefile: 1,076; sh: 427
file content (833 lines) | stat: -rw-r--r-- 25,295 bytes parent folder | download | duplicates (3)
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
/*
 * This file is part of the flashrom project.
 *
 * Copyright (C) 2009,2010 Carl-Daniel Hailfinger
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 */

#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#include <errno.h>
#include "flash.h"
#include "chipdrivers.h"
#include "programmer.h"

/* Remove the #define below if you don't want SPI flash chip emulation. */
#define EMULATE_SPI_CHIP 1

#if EMULATE_SPI_CHIP
#define EMULATE_CHIP 1
#include "spi.h"
#endif

#if EMULATE_CHIP
#include <sys/types.h>
#include <sys/stat.h>
#endif

#if EMULATE_CHIP
static uint8_t *flashchip_contents = NULL;
enum emu_chip {
	EMULATE_NONE,
	EMULATE_ST_M25P10_RES,
	EMULATE_SST_SST25VF040_REMS,
	EMULATE_SST_SST25VF032B,
	EMULATE_MACRONIX_MX25L6436,
};
static enum emu_chip emu_chip = EMULATE_NONE;
static char *emu_persistent_image = NULL;
static unsigned int emu_chip_size = 0;
#if EMULATE_SPI_CHIP
static unsigned int emu_max_byteprogram_size = 0;
static unsigned int emu_max_aai_size = 0;
static unsigned int emu_jedec_se_size = 0;
static unsigned int emu_jedec_be_52_size = 0;
static unsigned int emu_jedec_be_d8_size = 0;
static unsigned int emu_jedec_ce_60_size = 0;
static unsigned int emu_jedec_ce_c7_size = 0;
unsigned char spi_blacklist[256];
unsigned char spi_ignorelist[256];
int spi_blacklist_size = 0;
int spi_ignorelist_size = 0;
static uint8_t emu_status = 0;

/* A legit complete SFDP table based on the MX25L6436E (rev. 1.8) datasheet. */
static const uint8_t sfdp_table[] = {
	0x53, 0x46, 0x44, 0x50, // @0x00: SFDP signature
	0x00, 0x01, 0x01, 0xFF, // @0x04: revision 1.0, 2 headers
	0x00, 0x00, 0x01, 0x09, // @0x08: JEDEC SFDP header rev. 1.0, 9 DW long
	0x1C, 0x00, 0x00, 0xFF, // @0x0C: PTP0 = 0x1C (instead of 0x30)
	0xC2, 0x00, 0x01, 0x04, // @0x10: Macronix header rev. 1.0, 4 DW long
	0x48, 0x00, 0x00, 0xFF, // @0x14: PTP1 = 0x48 (instead of 0x60)
	0xFF, 0xFF, 0xFF, 0xFF, // @0x18: hole.
	0xE5, 0x20, 0xC9, 0xFF, // @0x1C: SFDP parameter table start
	0xFF, 0xFF, 0xFF, 0x03, // @0x20
	0x00, 0xFF, 0x08, 0x6B, // @0x24
	0x08, 0x3B, 0x00, 0xFF, // @0x28
	0xEE, 0xFF, 0xFF, 0xFF, // @0x2C
	0xFF, 0xFF, 0x00, 0x00, // @0x30
	0xFF, 0xFF, 0x00, 0xFF, // @0x34
	0x0C, 0x20, 0x0F, 0x52, // @0x38
	0x10, 0xD8, 0x00, 0xFF, // @0x3C: SFDP parameter table end
	0xFF, 0xFF, 0xFF, 0xFF, // @0x40: hole.
	0xFF, 0xFF, 0xFF, 0xFF, // @0x44: hole.
	0x00, 0x36, 0x00, 0x27, // @0x48: Macronix parameter table start
	0xF4, 0x4F, 0xFF, 0xFF, // @0x4C
	0xD9, 0xC8, 0xFF, 0xFF, // @0x50
	0xFF, 0xFF, 0xFF, 0xFF, // @0x54: Macronix parameter table end
};

#endif
#endif

static unsigned int spi_write_256_chunksize = 256;

static int dummy_spi_send_command(struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
				  const unsigned char *writearr, unsigned char *readarr);
static int dummy_spi_write_256(struct flashctx *flash, const uint8_t *buf,
			       unsigned int start, unsigned int len);
static void dummy_chip_writeb(const struct flashctx *flash, uint8_t val, chipaddr addr);
static void dummy_chip_writew(const struct flashctx *flash, uint16_t val, chipaddr addr);
static void dummy_chip_writel(const struct flashctx *flash, uint32_t val, chipaddr addr);
static void dummy_chip_writen(const struct flashctx *flash, const uint8_t *buf, chipaddr addr, size_t len);
static uint8_t dummy_chip_readb(const struct flashctx *flash, const chipaddr addr);
static uint16_t dummy_chip_readw(const struct flashctx *flash, const chipaddr addr);
static uint32_t dummy_chip_readl(const struct flashctx *flash, const chipaddr addr);
static void dummy_chip_readn(const struct flashctx *flash, uint8_t *buf, const chipaddr addr, size_t len);

static const struct spi_master spi_master_dummyflasher = {
	.type		= SPI_CONTROLLER_DUMMY,
	.max_data_read	= MAX_DATA_READ_UNLIMITED,
	.max_data_write	= MAX_DATA_UNSPECIFIED,
	.command	= dummy_spi_send_command,
	.multicommand	= default_spi_send_multicommand,
	.read		= default_spi_read,
	.write_256	= dummy_spi_write_256,
	.write_aai	= default_spi_write_aai,
};

static const struct par_master par_master_dummy = {
		.chip_readb		= dummy_chip_readb,
		.chip_readw		= dummy_chip_readw,
		.chip_readl		= dummy_chip_readl,
		.chip_readn		= dummy_chip_readn,
		.chip_writeb		= dummy_chip_writeb,
		.chip_writew		= dummy_chip_writew,
		.chip_writel		= dummy_chip_writel,
		.chip_writen		= dummy_chip_writen,
};

enum chipbustype dummy_buses_supported = BUS_NONE;

static int dummy_shutdown(void *data)
{
	msg_pspew("%s\n", __func__);
#if EMULATE_CHIP
	if (emu_chip != EMULATE_NONE) {
		if (emu_persistent_image) {
			msg_pdbg("Writing %s\n", emu_persistent_image);
			write_buf_to_file(flashchip_contents, emu_chip_size, emu_persistent_image);
			free(emu_persistent_image);
			emu_persistent_image = NULL;
		}
		free(flashchip_contents);
	}
#endif
	return 0;
}

int dummy_init(void)
{
	char *bustext = NULL;
	char *tmp = NULL;
	int i;
#if EMULATE_SPI_CHIP
	char *status = NULL;
#endif
#if EMULATE_CHIP
	struct stat image_stat;
#endif

	msg_pspew("%s\n", __func__);

	bustext = extract_programmer_param("bus");
	msg_pdbg("Requested buses are: %s\n", bustext ? bustext : "default");
	if (!bustext)
		bustext = strdup("parallel+lpc+fwh+spi");
	/* Convert the parameters to lowercase. */
	tolower_string(bustext);

	dummy_buses_supported = BUS_NONE;
	if (strstr(bustext, "parallel")) {
		dummy_buses_supported |= BUS_PARALLEL;
		msg_pdbg("Enabling support for %s flash.\n", "parallel");
	}
	if (strstr(bustext, "lpc")) {
		dummy_buses_supported |= BUS_LPC;
		msg_pdbg("Enabling support for %s flash.\n", "LPC");
	}
	if (strstr(bustext, "fwh")) {
		dummy_buses_supported |= BUS_FWH;
		msg_pdbg("Enabling support for %s flash.\n", "FWH");
	}
	if (strstr(bustext, "spi")) {
		dummy_buses_supported |= BUS_SPI;
		msg_pdbg("Enabling support for %s flash.\n", "SPI");
	}
	if (dummy_buses_supported == BUS_NONE)
		msg_pdbg("Support for all flash bus types disabled.\n");
	free(bustext);

	tmp = extract_programmer_param("spi_write_256_chunksize");
	if (tmp) {
		spi_write_256_chunksize = atoi(tmp);
		free(tmp);
		if (spi_write_256_chunksize < 1) {
			msg_perr("invalid spi_write_256_chunksize\n");
			return 1;
		}
	}

	tmp = extract_programmer_param("spi_blacklist");
	if (tmp) {
		i = strlen(tmp);
		if (!strncmp(tmp, "0x", 2)) {
			i -= 2;
			memmove(tmp, tmp + 2, i + 1);
		}
		if ((i > 512) || (i % 2)) {
			msg_perr("Invalid SPI command blacklist length\n");
			free(tmp);
			return 1;
		}
		spi_blacklist_size = i / 2;
		for (i = 0; i < spi_blacklist_size * 2; i++) {
			if (!isxdigit((unsigned char)tmp[i])) {
				msg_perr("Invalid char \"%c\" in SPI command "
					 "blacklist\n", tmp[i]);
				free(tmp);
				return 1;
			}
		}
		for (i = 0; i < spi_blacklist_size; i++) {
			unsigned int tmp2;
			/* SCNx8 is apparently not supported by MSVC (and thus
			 * MinGW), so work around it with an extra variable
			 */
			sscanf(tmp + i * 2, "%2x", &tmp2);
			spi_blacklist[i] = (uint8_t)tmp2;
		}
		msg_pdbg("SPI blacklist is ");
		for (i = 0; i < spi_blacklist_size; i++)
			msg_pdbg("%02x ", spi_blacklist[i]);
		msg_pdbg(", size %i\n", spi_blacklist_size);
	}
	free(tmp);

	tmp = extract_programmer_param("spi_ignorelist");
	if (tmp) {
		i = strlen(tmp);
		if (!strncmp(tmp, "0x", 2)) {
			i -= 2;
			memmove(tmp, tmp + 2, i + 1);
		}
		if ((i > 512) || (i % 2)) {
			msg_perr("Invalid SPI command ignorelist length\n");
			free(tmp);
			return 1;
		}
		spi_ignorelist_size = i / 2;
		for (i = 0; i < spi_ignorelist_size * 2; i++) {
			if (!isxdigit((unsigned char)tmp[i])) {
				msg_perr("Invalid char \"%c\" in SPI command "
					 "ignorelist\n", tmp[i]);
				free(tmp);
				return 1;
			}
		}
		for (i = 0; i < spi_ignorelist_size; i++) {
			unsigned int tmp2;
			/* SCNx8 is apparently not supported by MSVC (and thus
			 * MinGW), so work around it with an extra variable
			 */
			sscanf(tmp + i * 2, "%2x", &tmp2);
			spi_ignorelist[i] = (uint8_t)tmp2;
		}
		msg_pdbg("SPI ignorelist is ");
		for (i = 0; i < spi_ignorelist_size; i++)
			msg_pdbg("%02x ", spi_ignorelist[i]);
		msg_pdbg(", size %i\n", spi_ignorelist_size);
	}
	free(tmp);

#if EMULATE_CHIP
	tmp = extract_programmer_param("emulate");
	if (!tmp) {
		msg_pdbg("Not emulating any flash chip.\n");
		/* Nothing else to do. */
		goto dummy_init_out;
	}
#if EMULATE_SPI_CHIP
	if (!strcmp(tmp, "M25P10.RES")) {
		emu_chip = EMULATE_ST_M25P10_RES;
		emu_chip_size = 128 * 1024;
		emu_max_byteprogram_size = 128;
		emu_max_aai_size = 0;
		emu_jedec_se_size = 0;
		emu_jedec_be_52_size = 0;
		emu_jedec_be_d8_size = 32 * 1024;
		emu_jedec_ce_60_size = 0;
		emu_jedec_ce_c7_size = emu_chip_size;
		msg_pdbg("Emulating ST M25P10.RES SPI flash chip (RES, page "
			 "write)\n");
	}
	if (!strcmp(tmp, "SST25VF040.REMS")) {
		emu_chip = EMULATE_SST_SST25VF040_REMS;
		emu_chip_size = 512 * 1024;
		emu_max_byteprogram_size = 1;
		emu_max_aai_size = 0;
		emu_jedec_se_size = 4 * 1024;
		emu_jedec_be_52_size = 32 * 1024;
		emu_jedec_be_d8_size = 0;
		emu_jedec_ce_60_size = emu_chip_size;
		emu_jedec_ce_c7_size = 0;
		msg_pdbg("Emulating SST SST25VF040.REMS SPI flash chip (REMS, "
			 "byte write)\n");
	}
	if (!strcmp(tmp, "SST25VF032B")) {
		emu_chip = EMULATE_SST_SST25VF032B;
		emu_chip_size = 4 * 1024 * 1024;
		emu_max_byteprogram_size = 1;
		emu_max_aai_size = 2;
		emu_jedec_se_size = 4 * 1024;
		emu_jedec_be_52_size = 32 * 1024;
		emu_jedec_be_d8_size = 64 * 1024;
		emu_jedec_ce_60_size = emu_chip_size;
		emu_jedec_ce_c7_size = emu_chip_size;
		msg_pdbg("Emulating SST SST25VF032B SPI flash chip (RDID, AAI "
			 "write)\n");
	}
	if (!strcmp(tmp, "MX25L6436")) {
		emu_chip = EMULATE_MACRONIX_MX25L6436;
		emu_chip_size = 8 * 1024 * 1024;
		emu_max_byteprogram_size = 256;
		emu_max_aai_size = 0;
		emu_jedec_se_size = 4 * 1024;
		emu_jedec_be_52_size = 32 * 1024;
		emu_jedec_be_d8_size = 64 * 1024;
		emu_jedec_ce_60_size = emu_chip_size;
		emu_jedec_ce_c7_size = emu_chip_size;
		msg_pdbg("Emulating Macronix MX25L6436 SPI flash chip (RDID, "
			 "SFDP)\n");
	}
#endif
	if (emu_chip == EMULATE_NONE) {
		msg_perr("Invalid chip specified for emulation: %s\n", tmp);
		free(tmp);
		return 1;
	}
	free(tmp);
	flashchip_contents = malloc(emu_chip_size);
	if (!flashchip_contents) {
		msg_perr("Out of memory!\n");
		return 1;
	}

#ifdef EMULATE_SPI_CHIP
	status = extract_programmer_param("spi_status");
	if (status) {
		char *endptr;
		errno = 0;
		emu_status = strtoul(status, &endptr, 0);
		free(status);
		if (errno != 0 || status == endptr) {
			msg_perr("Error: initial status register specified, "
				 "but the value could not be converted.\n");
			return 1;
		}
		msg_pdbg("Initial status register is set to 0x%02x.\n",
			 emu_status);
	}
#endif

	msg_pdbg("Filling fake flash chip with 0xff, size %i\n", emu_chip_size);
	memset(flashchip_contents, 0xff, emu_chip_size);

	/* Will be freed by shutdown function if necessary. */
	emu_persistent_image = extract_programmer_param("image");
	if (!emu_persistent_image) {
		/* Nothing else to do. */
		goto dummy_init_out;
	}
	/* We will silently (in default verbosity) ignore the file if it does not exist (yet) or the size does
	 * not match the emulated chip. */
	if (!stat(emu_persistent_image, &image_stat)) {
		msg_pdbg("Found persistent image %s, %jd B ",
			 emu_persistent_image, (intmax_t)image_stat.st_size);
		if (image_stat.st_size == emu_chip_size) {
			msg_pdbg("matches.\n");
			msg_pdbg("Reading %s\n", emu_persistent_image);
			read_buf_from_file(flashchip_contents, emu_chip_size,
					   emu_persistent_image);
		} else {
			msg_pdbg("doesn't match.\n");
		}
	}
#endif

dummy_init_out:
	if (register_shutdown(dummy_shutdown, NULL)) {
		free(flashchip_contents);
		return 1;
	}
	if (dummy_buses_supported & (BUS_PARALLEL | BUS_LPC | BUS_FWH))
		register_par_master(&par_master_dummy,
				    dummy_buses_supported & (BUS_PARALLEL | BUS_LPC | BUS_FWH));
	if (dummy_buses_supported & BUS_SPI)
		register_spi_master(&spi_master_dummyflasher);

	return 0;
}

void *dummy_map(const char *descr, uintptr_t phys_addr, size_t len)
{
	msg_pspew("%s: Mapping %s, 0x%zx bytes at 0x%0*" PRIxPTR "\n",
		  __func__, descr, len, PRIxPTR_WIDTH, phys_addr);
	return (void *)phys_addr;
}

void dummy_unmap(void *virt_addr, size_t len)
{
	msg_pspew("%s: Unmapping 0x%zx bytes at %p\n", __func__, len, virt_addr);
}

static void dummy_chip_writeb(const struct flashctx *flash, uint8_t val, chipaddr addr)
{
	msg_pspew("%s: addr=0x%" PRIxPTR ", val=0x%02x\n", __func__, addr, val);
}

static void dummy_chip_writew(const struct flashctx *flash, uint16_t val, chipaddr addr)
{
	msg_pspew("%s: addr=0x%" PRIxPTR ", val=0x%04x\n", __func__, addr, val);
}

static void dummy_chip_writel(const struct flashctx *flash, uint32_t val, chipaddr addr)
{
	msg_pspew("%s: addr=0x%" PRIxPTR ", val=0x%08x\n", __func__, addr, val);
}

static void dummy_chip_writen(const struct flashctx *flash, const uint8_t *buf, chipaddr addr, size_t len)
{
	size_t i;
	msg_pspew("%s: addr=0x%" PRIxPTR ", len=0x%zx, writing data (hex):", __func__, addr, len);
	for (i = 0; i < len; i++) {
		if ((i % 16) == 0)
			msg_pspew("\n");
		msg_pspew("%02x ", buf[i]);
	}
}

static uint8_t dummy_chip_readb(const struct flashctx *flash, const chipaddr addr)
{
	msg_pspew("%s:  addr=0x%" PRIxPTR ", returning 0xff\n", __func__, addr);
	return 0xff;
}

static uint16_t dummy_chip_readw(const struct flashctx *flash, const chipaddr addr)
{
	msg_pspew("%s:  addr=0x%" PRIxPTR ", returning 0xffff\n", __func__, addr);
	return 0xffff;
}

static uint32_t dummy_chip_readl(const struct flashctx *flash, const chipaddr addr)
{
	msg_pspew("%s:  addr=0x%" PRIxPTR ", returning 0xffffffff\n", __func__, addr);
	return 0xffffffff;
}

static void dummy_chip_readn(const struct flashctx *flash, uint8_t *buf, const chipaddr addr, size_t len)
{
	msg_pspew("%s:  addr=0x%" PRIxPTR ", len=0x%zx, returning array of 0xff\n", __func__, addr, len);
	memset(buf, 0xff, len);
	return;
}

#if EMULATE_SPI_CHIP
static int emulate_spi_chip_response(unsigned int writecnt,
				     unsigned int readcnt,
				     const unsigned char *writearr,
				     unsigned char *readarr)
{
	unsigned int offs, i, toread;
	static int unsigned aai_offs;
	const unsigned char sst25vf040_rems_response[2] = {0xbf, 0x44};
	const unsigned char sst25vf032b_rems_response[2] = {0xbf, 0x4a};
	const unsigned char mx25l6436_rems_response[2] = {0xc2, 0x16};

	if (writecnt == 0) {
		msg_perr("No command sent to the chip!\n");
		return 1;
	}
	/* spi_blacklist has precedence over spi_ignorelist. */
	for (i = 0; i < spi_blacklist_size; i++) {
		if (writearr[0] == spi_blacklist[i]) {
			msg_pdbg("Refusing blacklisted SPI command 0x%02x\n",
				 spi_blacklist[i]);
			return SPI_INVALID_OPCODE;
		}
	}
	for (i = 0; i < spi_ignorelist_size; i++) {
		if (writearr[0] == spi_ignorelist[i]) {
			msg_cdbg("Ignoring ignorelisted SPI command 0x%02x\n",
				 spi_ignorelist[i]);
			/* Return success because the command does not fail,
			 * it is simply ignored.
			 */
			return 0;
		}
	}

	if (emu_max_aai_size && (emu_status & SPI_SR_AAI)) {
		if (writearr[0] != JEDEC_AAI_WORD_PROGRAM &&
		    writearr[0] != JEDEC_WRDI &&
		    writearr[0] != JEDEC_RDSR) {
			msg_perr("Forbidden opcode (0x%02x) attempted during "
				 "AAI sequence!\n", writearr[0]);
			return 0;
		}
	}

	switch (writearr[0]) {
	case JEDEC_RES:
		if (writecnt < JEDEC_RES_OUTSIZE)
			break;
		/* offs calculation is only needed for SST chips which treat RES like REMS. */
		offs = writearr[1] << 16 | writearr[2] << 8 | writearr[3];
		offs += writecnt - JEDEC_REMS_OUTSIZE;
		switch (emu_chip) {
		case EMULATE_ST_M25P10_RES:
			if (readcnt > 0)
				memset(readarr, 0x10, readcnt);
			break;
		case EMULATE_SST_SST25VF040_REMS:
			for (i = 0; i < readcnt; i++)
				readarr[i] = sst25vf040_rems_response[(offs + i) % 2];
			break;
		case EMULATE_SST_SST25VF032B:
			for (i = 0; i < readcnt; i++)
				readarr[i] = sst25vf032b_rems_response[(offs + i) % 2];
			break;
		case EMULATE_MACRONIX_MX25L6436:
			if (readcnt > 0)
				memset(readarr, 0x16, readcnt);
			break;
		default: /* ignore */
			break;
		}
		break;
	case JEDEC_REMS:
		/* REMS response has wraparound and uses an address parameter. */
		if (writecnt < JEDEC_REMS_OUTSIZE)
			break;
		offs = writearr[1] << 16 | writearr[2] << 8 | writearr[3];
		offs += writecnt - JEDEC_REMS_OUTSIZE;
		switch (emu_chip) {
		case EMULATE_SST_SST25VF040_REMS:
			for (i = 0; i < readcnt; i++)
				readarr[i] = sst25vf040_rems_response[(offs + i) % 2];
			break;
		case EMULATE_SST_SST25VF032B:
			for (i = 0; i < readcnt; i++)
				readarr[i] = sst25vf032b_rems_response[(offs + i) % 2];
			break;
		case EMULATE_MACRONIX_MX25L6436:
			for (i = 0; i < readcnt; i++)
				readarr[i] = mx25l6436_rems_response[(offs + i) % 2];
			break;
		default: /* ignore */
			break;
		}
		break;
	case JEDEC_RDID:
		switch (emu_chip) {
		case EMULATE_SST_SST25VF032B:
			if (readcnt > 0)
				readarr[0] = 0xbf;
			if (readcnt > 1)
				readarr[1] = 0x25;
			if (readcnt > 2)
				readarr[2] = 0x4a;
			break;
		case EMULATE_MACRONIX_MX25L6436:
			if (readcnt > 0)
				readarr[0] = 0xc2;
			if (readcnt > 1)
				readarr[1] = 0x20;
			if (readcnt > 2)
				readarr[2] = 0x17;
			break;
		default: /* ignore */
			break;
		}
		break;
	case JEDEC_RDSR:
		memset(readarr, emu_status, readcnt);
		break;
	/* FIXME: this should be chip-specific. */
	case JEDEC_EWSR:
	case JEDEC_WREN:
		emu_status |= SPI_SR_WEL;
		break;
	case JEDEC_WRSR:
		if (!(emu_status & SPI_SR_WEL)) {
			msg_perr("WRSR attempted, but WEL is 0!\n");
			break;
		}
		/* FIXME: add some reasonable simulation of the busy flag */
		emu_status = writearr[1] & ~SPI_SR_WIP;
		msg_pdbg2("WRSR wrote 0x%02x.\n", emu_status);
		break;
	case JEDEC_READ:
		offs = writearr[1] << 16 | writearr[2] << 8 | writearr[3];
		/* Truncate to emu_chip_size. */
		offs %= emu_chip_size;
		if (readcnt > 0)
			memcpy(readarr, flashchip_contents + offs, readcnt);
		break;
	case JEDEC_BYTE_PROGRAM:
		offs = writearr[1] << 16 | writearr[2] << 8 | writearr[3];
		/* Truncate to emu_chip_size. */
		offs %= emu_chip_size;
		if (writecnt < 5) {
			msg_perr("BYTE PROGRAM size too short!\n");
			return 1;
		}
		if (writecnt - 4 > emu_max_byteprogram_size) {
			msg_perr("Max BYTE PROGRAM size exceeded!\n");
			return 1;
		}
		memcpy(flashchip_contents + offs, writearr + 4, writecnt - 4);
		break;
	case JEDEC_AAI_WORD_PROGRAM:
		if (!emu_max_aai_size)
			break;
		if (!(emu_status & SPI_SR_AAI)) {
			if (writecnt < JEDEC_AAI_WORD_PROGRAM_OUTSIZE) {
				msg_perr("Initial AAI WORD PROGRAM size too "
					 "short!\n");
				return 1;
			}
			if (writecnt > JEDEC_AAI_WORD_PROGRAM_OUTSIZE) {
				msg_perr("Initial AAI WORD PROGRAM size too "
					 "long!\n");
				return 1;
			}
			emu_status |= SPI_SR_AAI;
			aai_offs = writearr[1] << 16 | writearr[2] << 8 |
				   writearr[3];
			/* Truncate to emu_chip_size. */
			aai_offs %= emu_chip_size;
			memcpy(flashchip_contents + aai_offs, writearr + 4, 2);
			aai_offs += 2;
		} else {
			if (writecnt < JEDEC_AAI_WORD_PROGRAM_CONT_OUTSIZE) {
				msg_perr("Continuation AAI WORD PROGRAM size "
					 "too short!\n");
				return 1;
			}
			if (writecnt > JEDEC_AAI_WORD_PROGRAM_CONT_OUTSIZE) {
				msg_perr("Continuation AAI WORD PROGRAM size "
					 "too long!\n");
				return 1;
			}
			memcpy(flashchip_contents + aai_offs, writearr + 1, 2);
			aai_offs += 2;
		}
		break;
	case JEDEC_WRDI:
		if (emu_max_aai_size)
			emu_status &= ~SPI_SR_AAI;
		break;
	case JEDEC_SE:
		if (!emu_jedec_se_size)
			break;
		if (writecnt != JEDEC_SE_OUTSIZE) {
			msg_perr("SECTOR ERASE 0x20 outsize invalid!\n");
			return 1;
		}
		if (readcnt != JEDEC_SE_INSIZE) {
			msg_perr("SECTOR ERASE 0x20 insize invalid!\n");
			return 1;
		}
		offs = writearr[1] << 16 | writearr[2] << 8 | writearr[3];
		if (offs & (emu_jedec_se_size - 1))
			msg_pdbg("Unaligned SECTOR ERASE 0x20: 0x%x\n", offs);
		offs &= ~(emu_jedec_se_size - 1);
		memset(flashchip_contents + offs, 0xff, emu_jedec_se_size);
		break;
	case JEDEC_BE_52:
		if (!emu_jedec_be_52_size)
			break;
		if (writecnt != JEDEC_BE_52_OUTSIZE) {
			msg_perr("BLOCK ERASE 0x52 outsize invalid!\n");
			return 1;
		}
		if (readcnt != JEDEC_BE_52_INSIZE) {
			msg_perr("BLOCK ERASE 0x52 insize invalid!\n");
			return 1;
		}
		offs = writearr[1] << 16 | writearr[2] << 8 | writearr[3];
		if (offs & (emu_jedec_be_52_size - 1))
			msg_pdbg("Unaligned BLOCK ERASE 0x52: 0x%x\n", offs);
		offs &= ~(emu_jedec_be_52_size - 1);
		memset(flashchip_contents + offs, 0xff, emu_jedec_be_52_size);
		break;
	case JEDEC_BE_D8:
		if (!emu_jedec_be_d8_size)
			break;
		if (writecnt != JEDEC_BE_D8_OUTSIZE) {
			msg_perr("BLOCK ERASE 0xd8 outsize invalid!\n");
			return 1;
		}
		if (readcnt != JEDEC_BE_D8_INSIZE) {
			msg_perr("BLOCK ERASE 0xd8 insize invalid!\n");
			return 1;
		}
		offs = writearr[1] << 16 | writearr[2] << 8 | writearr[3];
		if (offs & (emu_jedec_be_d8_size - 1))
			msg_pdbg("Unaligned BLOCK ERASE 0xd8: 0x%x\n", offs);
		offs &= ~(emu_jedec_be_d8_size - 1);
		memset(flashchip_contents + offs, 0xff, emu_jedec_be_d8_size);
		break;
	case JEDEC_CE_60:
		if (!emu_jedec_ce_60_size)
			break;
		if (writecnt != JEDEC_CE_60_OUTSIZE) {
			msg_perr("CHIP ERASE 0x60 outsize invalid!\n");
			return 1;
		}
		if (readcnt != JEDEC_CE_60_INSIZE) {
			msg_perr("CHIP ERASE 0x60 insize invalid!\n");
			return 1;
		}
		/* JEDEC_CE_60_OUTSIZE is 1 (no address) -> no offset. */
		/* emu_jedec_ce_60_size is emu_chip_size. */
		memset(flashchip_contents, 0xff, emu_jedec_ce_60_size);
		break;
	case JEDEC_CE_C7:
		if (!emu_jedec_ce_c7_size)
			break;
		if (writecnt != JEDEC_CE_C7_OUTSIZE) {
			msg_perr("CHIP ERASE 0xc7 outsize invalid!\n");
			return 1;
		}
		if (readcnt != JEDEC_CE_C7_INSIZE) {
			msg_perr("CHIP ERASE 0xc7 insize invalid!\n");
			return 1;
		}
		/* JEDEC_CE_C7_OUTSIZE is 1 (no address) -> no offset. */
		/* emu_jedec_ce_c7_size is emu_chip_size. */
		memset(flashchip_contents, 0xff, emu_jedec_ce_c7_size);
		break;
	case JEDEC_SFDP:
		if (emu_chip != EMULATE_MACRONIX_MX25L6436)
			break;
		if (writecnt < 4)
			break;
		offs = writearr[1] << 16 | writearr[2] << 8 | writearr[3];

		/* SFDP expects one dummy byte after the address. */
		if (writecnt == 4) {
			/* The dummy byte was not written, make sure it is read instead.
			 * Shifting and shortening the read array does achieve this goal.
			 */
			readarr++;
			readcnt--;
		} else {
			/* The response is shifted if more than 5 bytes are written, because SFDP data is
			 * already shifted out by the chip while those superfluous bytes are written. */
			offs += writecnt - 5;
		}

		/* The SFDP spec implies that the start address of an SFDP read may be truncated to fit in the
		 * SFDP table address space, i.e. the start address may be wrapped around at SFDP table size.
		 * This is a reasonable implementation choice in hardware because it saves a few gates. */
		if (offs >= sizeof(sfdp_table)) {
			msg_pdbg("Wrapping the start address around the SFDP table boundary (using 0x%x "
				 "instead of 0x%x).\n", (unsigned int)(offs % sizeof(sfdp_table)), offs);
			offs %= sizeof(sfdp_table);
		}
		toread = min(sizeof(sfdp_table) - offs, readcnt);
		memcpy(readarr, sfdp_table + offs, toread);
		if (toread < readcnt)
			msg_pdbg("Crossing the SFDP table boundary in a single "
				 "continuous chunk produces undefined results "
				 "after that point.\n");
		break;
	default:
		/* No special response. */
		break;
	}
	if (writearr[0] != JEDEC_WREN && writearr[0] != JEDEC_EWSR)
		emu_status &= ~SPI_SR_WEL;
	return 0;
}
#endif

static int dummy_spi_send_command(struct flashctx *flash, unsigned int writecnt,
				  unsigned int readcnt,
				  const unsigned char *writearr,
				  unsigned char *readarr)
{
	int i;

	msg_pspew("%s:", __func__);

	msg_pspew(" writing %u bytes:", writecnt);
	for (i = 0; i < writecnt; i++)
		msg_pspew(" 0x%02x", writearr[i]);

	/* Response for unknown commands and missing chip is 0xff. */
	memset(readarr, 0xff, readcnt);
#if EMULATE_SPI_CHIP
	switch (emu_chip) {
	case EMULATE_ST_M25P10_RES:
	case EMULATE_SST_SST25VF040_REMS:
	case EMULATE_SST_SST25VF032B:
	case EMULATE_MACRONIX_MX25L6436:
		if (emulate_spi_chip_response(writecnt, readcnt, writearr,
					      readarr)) {
			msg_pdbg("Invalid command sent to flash chip!\n");
			return 1;
		}
		break;
	default:
		break;
	}
#endif
	msg_pspew(" reading %u bytes:", readcnt);
	for (i = 0; i < readcnt; i++)
		msg_pspew(" 0x%02x", readarr[i]);
	msg_pspew("\n");
	return 0;
}

static int dummy_spi_write_256(struct flashctx *flash, const uint8_t *buf, unsigned int start, unsigned int len)
{
	return spi_write_chunked(flash, buf, start, len,
				 spi_write_256_chunksize);
}