flashrom/w29ee011.c at main · system76/flashrom · GitHub

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/*
 * This file is part of the flashrom project.
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 * SPDX-FileCopyrightText: 2007 Markus Boas <ryven@ryven.de>
 */

#include <string.h>
#include <stdbool.h>

#include "flash.h"
#include "parallel.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;
}