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/*
* This file is part of the flashrom project.
*
* Copyright (C) 2008 Claus Gindhart <claus.gindhart@kontron.com>
* Copyright (C) 2009 Sean Nelson <audiohacked@gmail.com>
* Copyright (C) 2013 Stefan Tauner
*
* 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.
*/
/*
* All ST M50 chips are locked on startup. Most of them have a uniform 64 kB block layout, but some have
* a non-uniform block/sector segmentation which has to be handled with more care. Some of the non-uniform
* chips support erasing of the 4 kB sectors with another command.
*/
#include "flash.h"
#include "chipdrivers.h"
static int stm50_erase_sector(struct flashctx *flash, unsigned int addr)
{
chipaddr bios = flash->virtual_memory + addr;
// clear status register
chip_writeb(flash, 0x50, bios);
// now start it
chip_writeb(flash, 0x32, bios);
chip_writeb(flash, 0xd0, bios);
programmer_delay(flash, 10);
uint8_t status = wait_82802ab(flash);
print_status_82802ab(status);
return status == 0x80;
}
/* Some ST M50* chips do support erasing of sectors. This function will derive the erase function to use from
* the length of the of the block. For calls that apparently do not address a sector (but a block) we just call
* the block erase function instead. FIXME: This duplicates the behavior of the remaining erasers for blocks and
* might be fixed when flashrom supports multiple functions per eraser or erasers that do erase parts of the
* chip only. */
int erase_sector_stm50(struct flashctx *flash, unsigned int addr, unsigned int len)
{
if (len == 4096)
return stm50_erase_sector(flash, addr);
else
return erase_block_82802ab(flash, addr, len);
}
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