736c1d8618
Signed-off-by: Markus Boas <ryven@ryven.de> Acked-by: Uwe Hermann <uwe@hermann-uwe.de> git-svn-id: svn://svn.coreboot.org/coreboot/trunk@2753 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
61 lines
1.8 KiB
C
61 lines
1.8 KiB
C
/*
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* This file is part of the flashrom project.
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*
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* Copyright (C) 2007 Markus Boas <ryven@ryven.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "flash.h"
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int probe_w29ee011(struct flashchip *flash)
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{
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volatile uint8_t *bios = flash->virtual_memory;
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uint8_t id1, id2;
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/* Issue JEDEC Product ID Entry command */
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*(volatile uint8_t *)(bios + 0x5555) = 0xAA;
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myusec_delay(10);
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*(volatile uint8_t *)(bios + 0x2AAA) = 0x55;
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myusec_delay(10);
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*(volatile uint8_t *)(bios + 0x5555) = 0x80;
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myusec_delay(10);
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*(volatile uint8_t *)(bios + 0x5555) = 0xAA;
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myusec_delay(10);
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*(volatile uint8_t *)(bios + 0x2AAA) = 0x55;
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myusec_delay(10);
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*(volatile uint8_t *)(bios + 0x5555) = 0x60;
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myusec_delay(10);
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/* Read product ID */
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id1 = *(volatile uint8_t *)bios;
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id2 = *(volatile uint8_t *)(bios + 0x01);
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/* Issue JEDEC Product ID Exit command */
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*(volatile uint8_t *)(bios + 0x5555) = 0xAA;
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myusec_delay(10);
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*(volatile uint8_t *)(bios + 0x2AAA) = 0x55;
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myusec_delay(10);
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*(volatile uint8_t *)(bios + 0x5555) = 0xF0;
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myusec_delay(10);
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printf_debug("%s: id1 0x%x, id2 0x%x\n", __FUNCTION__, id1, id2);
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if (id1 == flash->manufacture_id && id2 == flash->model_id)
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return 1;
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return 0;
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}
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