1 /*
2 * This file is part of the flashrom project.
3 *
4 * Copyright (C) 2007 Markus Boas <[email protected]>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 */
16
17 #include <string.h>
18 #include <stdbool.h>
19
20 #include "flash.h"
21 #include "chipdrivers.h"
22
w29ee011_can_override(const char * const chip_name,const char * const override_chip)23 bool w29ee011_can_override(const char *const chip_name, const char *const override_chip)
24 {
25 if (!override_chip || strcmp(override_chip, chip_name)) {
26 msg_cdbg("Old Winbond W29* probe method disabled because "
27 "the probing sequence puts the AMIC A49LF040A in "
28 "a funky state. Use 'flashrom -c %s' if you "
29 "have a board with such a chip.\n", chip_name);
30 return false;
31 }
32
33 return true;
34 }
35
36 /* According to the Winbond W29EE011, W29EE012, W29C010M, W29C011A
37 * datasheets this is the only valid probe function for those chips.
38 */
probe_w29ee011(struct flashctx * flash)39 int probe_w29ee011(struct flashctx *flash)
40 {
41 chipaddr bios = flash->virtual_memory;
42 uint8_t id1, id2;
43
44 /* Issue JEDEC Product ID Entry command */
45 chip_writeb(flash, 0xAA, bios + 0x5555);
46 programmer_delay(flash, 10);
47 chip_writeb(flash, 0x55, bios + 0x2AAA);
48 programmer_delay(flash, 10);
49 chip_writeb(flash, 0x80, bios + 0x5555);
50 programmer_delay(flash, 10);
51 chip_writeb(flash, 0xAA, bios + 0x5555);
52 programmer_delay(flash, 10);
53 chip_writeb(flash, 0x55, bios + 0x2AAA);
54 programmer_delay(flash, 10);
55 chip_writeb(flash, 0x60, bios + 0x5555);
56 programmer_delay(flash, 10);
57
58 /* Read product ID */
59 id1 = chip_readb(flash, bios);
60 id2 = chip_readb(flash, bios + 0x01);
61
62 /* Issue JEDEC Product ID Exit command */
63 chip_writeb(flash, 0xAA, bios + 0x5555);
64 programmer_delay(flash, 10);
65 chip_writeb(flash, 0x55, bios + 0x2AAA);
66 programmer_delay(flash, 10);
67 chip_writeb(flash, 0xF0, bios + 0x5555);
68 programmer_delay(flash, 10);
69
70 msg_cdbg("%s: id1 0x%02x, id2 0x%02x\n", __func__, id1, id2);
71
72 if (id1 == flash->chip->manufacture_id && id2 == flash->chip->model_id)
73 return 1;
74
75 return 0;
76 }
77