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/*
* This file is part of the flashrom project.
*
* Copyright (C) 2007 Markus Boas <ryven@ryven.de>
*
* 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; either version 2 of the License, or
* (at your option) any later version.
*
* 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.
*/
#include <string.h>
#include <stdbool.h>
#include "flash.h"
#include "chipdrivers.h"
bool w29ee011_can_override(const char *const chip_name, const char *const override_chip)
{
if (!override_chip || strcmp(override_chip, chip_name)) {
msg_cdbg("Old Winbond W29* probe method disabled because "
"the probing sequence puts the AMIC A49LF040A in "
"a funky state. Use 'flashrom -c %s' if you "
"have a board with such a chip.\n", chip_name);
return false;
}
return true;
}
/* According to the Winbond W29EE011, W29EE012, W29C010M, W29C011A
* datasheets this is the only valid probe function for those chips.
*/
int probe_w29ee011(struct flashctx *flash)
{
chipaddr bios = flash->virtual_memory;
uint8_t id1, id2;
/* Issue JEDEC Product ID Entry command */
chip_writeb(flash, 0xAA, bios + 0x5555);
programmer_delay(flash, 10);
chip_writeb(flash, 0x55, bios + 0x2AAA);
programmer_delay(flash, 10);
chip_writeb(flash, 0x80, bios + 0x5555);
programmer_delay(flash, 10);
chip_writeb(flash, 0xAA, bios + 0x5555);
programmer_delay(flash, 10);
chip_writeb(flash, 0x55, bios + 0x2AAA);
programmer_delay(flash, 10);
chip_writeb(flash, 0x60, bios + 0x5555);
programmer_delay(flash, 10);
/* Read product ID */
id1 = chip_readb(flash, bios);
id2 = chip_readb(flash, bios + 0x01);
/* Issue JEDEC Product ID Exit command */
chip_writeb(flash, 0xAA, bios + 0x5555);
programmer_delay(flash, 10);
chip_writeb(flash, 0x55, bios + 0x2AAA);
programmer_delay(flash, 10);
chip_writeb(flash, 0xF0, bios + 0x5555);
programmer_delay(flash, 10);
msg_cdbg("%s: id1 0x%02x, id2 0x%02x\n", __func__, id1, id2);
if (id1 == flash->chip->manufacture_id && id2 == flash->chip->model_id)
return 1;
return 0;
}
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