2 * This file is part of the flashrom project.
4 * Copyright (C) 2007 Markus Boas <ryven@ryven.de>
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.
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.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
24 /* According to the Winbond W29EE011, W29EE012, W29C010M, W29C011A
25 * datasheets this is the only valid probe function for those chips.
27 int probe_w29ee011(struct flashctx *flash)
29 chipaddr bios = flash->virtual_memory;
32 if (!chip_to_probe || strcmp(chip_to_probe, flash->name)) {
33 msg_cdbg("Old Winbond W29* probe method disabled because "
34 "the probing sequence puts the AMIC A49LF040A in "
35 "a funky state. Use 'flashrom -c %s' if you "
36 "have a board with such a chip.\n", flash->name);
40 /* Issue JEDEC Product ID Entry command */
41 chip_writeb(flash, 0xAA, bios + 0x5555);
43 chip_writeb(flash, 0x55, bios + 0x2AAA);
45 chip_writeb(flash, 0x80, bios + 0x5555);
47 chip_writeb(flash, 0xAA, bios + 0x5555);
49 chip_writeb(flash, 0x55, bios + 0x2AAA);
51 chip_writeb(flash, 0x60, bios + 0x5555);
55 id1 = chip_readb(flash, bios);
56 id2 = chip_readb(flash, bios + 0x01);
58 /* Issue JEDEC Product ID Exit command */
59 chip_writeb(flash, 0xAA, bios + 0x5555);
61 chip_writeb(flash, 0x55, bios + 0x2AAA);
63 chip_writeb(flash, 0xF0, bios + 0x5555);
66 msg_cdbg("%s: id1 0x%02x, id2 0x%02x\n", __func__, id1, id2);
68 if (id1 == flash->manufacture_id && id2 == flash->model_id)