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/*
* This file is part of the flashrom project.
*
* Copyright (C) 2000 Silicon Integrated System Corporation
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "flash.h"
#include "chipdrivers.h"
/* WARNING!
This chip uses the standard JEDEC Addresses in 16-bit mode as word
addresses. In byte mode, 0xAAA has to be used instead of 0x555 and
0x555 instead of 0x2AA. Do *not* blindly replace with standard JEDEC
functions. */
/* chunksize is 1 */
int write_m29f400bt(struct flashctx *flash, const uint8_t *src, unsigned int start, unsigned int len)
{
int i;
chipaddr bios = flash->virtual_memory;
chipaddr dst = flash->virtual_memory + start;
for (i = 0; i < len; i++) {
chip_writeb(flash, 0xAA, bios + 0xAAA);
chip_writeb(flash, 0x55, bios + 0x555);
chip_writeb(flash, 0xA0, bios + 0xAAA);
/* transfer data from source to destination */
chip_writeb(flash, *src, dst);
toggle_ready_jedec(flash, dst);
#if 0
/* We only want to print something in the error case. */
msg_cerr("Value in the flash at address 0x%lx = %#x, want %#x\n",
(dst - bios), chip_readb(flash, dst), *src);
#endif
dst++;
src++;
}
/* FIXME: Ignore errors for now. */
return 0;
}
int probe_m29f400bt(struct flashctx *flash)
{
chipaddr bios = flash->virtual_memory;
uint8_t id1, id2;
chip_writeb(flash, 0xAA, bios + 0xAAA);
chip_writeb(flash, 0x55, bios + 0x555);
chip_writeb(flash, 0x90, bios + 0xAAA);
programmer_delay(10);
id1 = chip_readb(flash, bios);
/* The data sheet says id2 is at (bios + 0x01) and id2 listed in
* flash.h does not match. It should be possible to use JEDEC probe.
*/
id2 = chip_readb(flash, bios + 0x02);
chip_writeb(flash, 0xAA, bios + 0xAAA);
chip_writeb(flash, 0x55, bios + 0x555);
chip_writeb(flash, 0xF0, bios + 0xAAA);
programmer_delay(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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