| 1 | /*␊ |
| 2 | * This file is part of the flashrom project.␊ |
| 3 | *␊ |
| 4 | * Copyright (C) 2007 Markus Boas <ryven@ryven.de>␊ |
| 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 | * 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␊ |
| 19 | */␊ |
| 20 | ␊ |
| 21 | #include <string.h>␊ |
| 22 | #include "flash.h"␊ |
| 23 | ␊ |
| 24 | /* According to the Winbond W29EE011, W29EE012, W29C010M, W29C011A␊ |
| 25 | * datasheets this is the only valid probe function for those chips.␊ |
| 26 | */␊ |
| 27 | int probe_w29ee011(struct flashctx *flash)␊ |
| 28 | {␊ |
| 29 | ␉chipaddr bios = flash->virtual_memory;␊ |
| 30 | ␉uint8_t id1, id2;␊ |
| 31 | ␊ |
| 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);␊ |
| 37 | ␉␉return 0;␊ |
| 38 | ␉}␊ |
| 39 | ␊ |
| 40 | ␉/* Issue JEDEC Product ID Entry command */␊ |
| 41 | ␉chip_writeb(flash, 0xAA, bios + 0x5555);␊ |
| 42 | ␉programmer_delay(10);␊ |
| 43 | ␉chip_writeb(flash, 0x55, bios + 0x2AAA);␊ |
| 44 | ␉programmer_delay(10);␊ |
| 45 | ␉chip_writeb(flash, 0x80, bios + 0x5555);␊ |
| 46 | ␉programmer_delay(10);␊ |
| 47 | ␉chip_writeb(flash, 0xAA, bios + 0x5555);␊ |
| 48 | ␉programmer_delay(10);␊ |
| 49 | ␉chip_writeb(flash, 0x55, bios + 0x2AAA);␊ |
| 50 | ␉programmer_delay(10);␊ |
| 51 | ␉chip_writeb(flash, 0x60, bios + 0x5555);␊ |
| 52 | ␉programmer_delay(10);␊ |
| 53 | ␊ |
| 54 | ␉/* Read product ID */␊ |
| 55 | ␉id1 = chip_readb(flash, bios);␊ |
| 56 | ␉id2 = chip_readb(flash, bios + 0x01);␊ |
| 57 | ␊ |
| 58 | ␉/* Issue JEDEC Product ID Exit command */␊ |
| 59 | ␉chip_writeb(flash, 0xAA, bios + 0x5555);␊ |
| 60 | ␉programmer_delay(10);␊ |
| 61 | ␉chip_writeb(flash, 0x55, bios + 0x2AAA);␊ |
| 62 | ␉programmer_delay(10);␊ |
| 63 | ␉chip_writeb(flash, 0xF0, bios + 0x5555);␊ |
| 64 | ␉programmer_delay(10);␊ |
| 65 | ␊ |
| 66 | ␉msg_cdbg("%s: id1 0x%02x, id2 0x%02x\n", __func__, id1, id2);␊ |
| 67 | ␊ |
| 68 | ␉if (id1 == flash->manufacture_id && id2 == flash->model_id)␊ |
| 69 | ␉␉return 1;␊ |
| 70 | ␊ |
| 71 | ␉return 0;␊ |
| 72 | }␊ |
| 73 | |
