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flashrom/jedec.c
Carl-Daniel Hailfinger 8130f2d3ec Check probing results for flash contents 
When flashrom JEDEC code sends the ID command to the chip, it expects to
see IDs in the default flash location.

However, sometimes the chip does not react to the ID command, either
because it doesn't understand the command or because the command never
reached it. One way to detect this is to compare ID output with flash
chip contents for the same location. If they are identical, there is a
high chance you're not actually seeing ID output. Warn the user in that
case.

This patch helps a lot when a chip is not recognized and we want to
check if the probe responses are real IDs or just random flash chip
contents.

This should probably be added to all probe functions, but probe_jedec
is called for all sizes and thus flashrom will check this condition at
least once per size, making sure we can cross-match the warning.

Corresponding to flashrom svn r494.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: FENG Yu Ning <fengyuning1984@gmail.com>
2009-05-11 14:40:31 +00:00

352 lines
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/*
* This file is part of the flashrom project.
*
* Copyright (C) 2000 Silicon Integrated System Corporation
* Copyright (C) 2006 Giampiero Giancipoli <gianci@email.it>
* Copyright (C) 2006 coresystems GmbH <info@coresystems.de>
* Copyright (C) 2007 Carl-Daniel Hailfinger
*
* 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 <stdio.h>
#include <stdint.h>
#include "flash.h"
#define MAX_REFLASH_TRIES 0x10
/* Check one byte for odd parity */
uint8_t oddparity(uint8_t val)
{
val = (val ^ (val >> 4)) & 0xf;
val = (val ^ (val >> 2)) & 0x3;
return (val ^ (val >> 1)) & 0x1;
}
void toggle_ready_jedec(volatile uint8_t *dst)
{
unsigned int i = 0;
uint8_t tmp1, tmp2;
tmp1 = chip_readb(dst) & 0x40;
while (i++ < 0xFFFFFFF) {
tmp2 = chip_readb(dst) & 0x40;
if (tmp1 == tmp2) {
break;
}
tmp1 = tmp2;
}
}
void data_polling_jedec(volatile uint8_t *dst, uint8_t data)
{
unsigned int i = 0;
uint8_t tmp;
data &= 0x80;
while (i++ < 0xFFFFFFF) {
tmp = chip_readb(dst) & 0x80;
if (tmp == data) {
break;
}
}
}
void unprotect_jedec(volatile uint8_t *bios)
{
chip_writeb(0xAA, bios + 0x5555);
chip_writeb(0x55, bios + 0x2AAA);
chip_writeb(0x80, bios + 0x5555);
chip_writeb(0xAA, bios + 0x5555);
chip_writeb(0x55, bios + 0x2AAA);
chip_writeb(0x20, bios + 0x5555);
usleep(200);
}
void protect_jedec(volatile uint8_t *bios)
{
chip_writeb(0xAA, bios + 0x5555);
chip_writeb(0x55, bios + 0x2AAA);
chip_writeb(0xA0, bios + 0x5555);
usleep(200);
}
int probe_jedec(struct flashchip *flash)
{
volatile uint8_t *bios = flash->virtual_memory;
uint8_t id1, id2;
uint32_t largeid1, largeid2;
uint32_t flashcontent1, flashcontent2;
/* Issue JEDEC Product ID Entry command */
chip_writeb(0xAA, bios + 0x5555);
myusec_delay(10);
chip_writeb(0x55, bios + 0x2AAA);
myusec_delay(10);
chip_writeb(0x90, bios + 0x5555);
/* Older chips may need up to 100 us to respond. The ATMEL 29C020
* needs 10 ms according to the data sheet.
*/
myusec_delay(10000);
/* Read product ID */
id1 = chip_readb(bios);
id2 = chip_readb(bios + 0x01);
largeid1 = id1;
largeid2 = id2;
/* Check if it is a continuation ID, this should be a while loop. */
if (id1 == 0x7F) {
largeid1 <<= 8;
id1 = chip_readb(bios + 0x100);
largeid1 |= id1;
}
if (id2 == 0x7F) {
largeid2 <<= 8;
id2 = chip_readb(bios + 0x101);
largeid2 |= id2;
}
/* Issue JEDEC Product ID Exit command */
chip_writeb(0xAA, bios + 0x5555);
myusec_delay(10);
chip_writeb(0x55, bios + 0x2AAA);
myusec_delay(10);
chip_writeb(0xF0, bios + 0x5555);
myusec_delay(40);
printf_debug("%s: id1 0x%02x, id2 0x%02x", __FUNCTION__, largeid1, largeid2);
if (!oddparity(id1))
printf_debug(", id1 parity violation");
/* Read the product ID location again. We should now see normal flash contents. */
flashcontent1 = chip_readb(bios);
flashcontent2 = chip_readb(bios + 0x01);
/* Check if it is a continuation ID, this should be a while loop. */
if (flashcontent1 == 0x7F) {
flashcontent1 <<= 8;
flashcontent1 |= chip_readb(bios + 0x100);
}
if (flashcontent2 == 0x7F) {
flashcontent2 <<= 8;
flashcontent2 |= chip_readb(bios + 0x101);
}
if (largeid1 == flashcontent1)
printf_debug(", id1 is normal flash content");
if (largeid2 == flashcontent2)
printf_debug(", id2 is normal flash content");
printf_debug("\n");
if (largeid1 == flash->manufacture_id && largeid2 == flash->model_id)
return 1;
return 0;
}
int erase_sector_jedec(volatile uint8_t *bios, unsigned int page)
{
/* Issue the Sector Erase command */
chip_writeb(0xAA, bios + 0x5555);
myusec_delay(10);
chip_writeb(0x55, bios + 0x2AAA);
myusec_delay(10);
chip_writeb(0x80, bios + 0x5555);
myusec_delay(10);
chip_writeb(0xAA, bios + 0x5555);
myusec_delay(10);
chip_writeb(0x55, bios + 0x2AAA);
myusec_delay(10);
chip_writeb(0x30, bios + page);
myusec_delay(10);
/* wait for Toggle bit ready */
toggle_ready_jedec(bios);
return 0;
}
int erase_block_jedec(volatile uint8_t *bios, unsigned int block)
{
/* Issue the Sector Erase command */
chip_writeb(0xAA, bios + 0x5555);
myusec_delay(10);
chip_writeb(0x55, bios + 0x2AAA);
myusec_delay(10);
chip_writeb(0x80, bios + 0x5555);
myusec_delay(10);
chip_writeb(0xAA, bios + 0x5555);
myusec_delay(10);
chip_writeb(0x55, bios + 0x2AAA);
myusec_delay(10);
chip_writeb(0x50, bios + block);
myusec_delay(10);
/* wait for Toggle bit ready */
toggle_ready_jedec(bios);
return 0;
}
int erase_chip_jedec(struct flashchip *flash)
{
volatile uint8_t *bios = flash->virtual_memory;
/* Issue the JEDEC Chip Erase command */
chip_writeb(0xAA, bios + 0x5555);
myusec_delay(10);
chip_writeb(0x55, bios + 0x2AAA);
myusec_delay(10);
chip_writeb(0x80, bios + 0x5555);
myusec_delay(10);
chip_writeb(0xAA, bios + 0x5555);
myusec_delay(10);
chip_writeb(0x55, bios + 0x2AAA);
myusec_delay(10);
chip_writeb(0x10, bios + 0x5555);
myusec_delay(10);
toggle_ready_jedec(bios);
return 0;
}
int write_page_write_jedec(volatile uint8_t *bios, uint8_t *src,
volatile uint8_t *dst, int page_size)
{
int i, tried = 0, start_index = 0, ok;
volatile uint8_t *d = dst;
uint8_t *s = src;
retry:
/* Issue JEDEC Data Unprotect comand */
chip_writeb(0xAA, bios + 0x5555);
chip_writeb(0x55, bios + 0x2AAA);
chip_writeb(0xA0, bios + 0x5555);
/* transfer data from source to destination */
for (i = start_index; i < page_size; i++) {
/* If the data is 0xFF, don't program it */
if (*src != 0xFF)
chip_writeb(*src, dst);
dst++;
src++;
}
toggle_ready_jedec(dst - 1);
dst = d;
src = s;
ok = 1;
for (i = 0; i < page_size; i++) {
if (chip_readb(dst) != *src) {
ok = 0;
break;
}
dst++;
src++;
}
if (!ok && tried++ < MAX_REFLASH_TRIES) {
start_index = i;
goto retry;
}
if (!ok) {
fprintf(stderr, " page %d failed!\n",
(unsigned int)(d - bios) / page_size);
}
return !ok;
}
int write_byte_program_jedec(volatile uint8_t *bios, uint8_t *src,
volatile uint8_t *dst)
{
int tried = 0, ok = 1;
/* If the data is 0xFF, don't program it */
if (*src == 0xFF) {
return -1;
}
retry:
/* Issue JEDEC Byte Program command */
chip_writeb(0xAA, bios + 0x5555);
chip_writeb(0x55, bios + 0x2AAA);
chip_writeb(0xA0, bios + 0x5555);
/* transfer data from source to destination */
chip_writeb(*src, dst);
toggle_ready_jedec(bios);
if (chip_readb(dst) != *src && tried++ < MAX_REFLASH_TRIES) {
goto retry;
}
if (tried >= MAX_REFLASH_TRIES)
ok = 0;
return !ok;
}
int write_sector_jedec(volatile uint8_t *bios, uint8_t *src,
volatile uint8_t *dst, unsigned int page_size)
{
int i;
for (i = 0; i < page_size; i++) {
write_byte_program_jedec(bios, src, dst);
dst++, src++;
}
return 0;
}
int write_jedec(struct flashchip *flash, uint8_t *buf)
{
int i;
int total_size = flash->total_size * 1024;
int page_size = flash->page_size;
volatile uint8_t *bios = flash->virtual_memory;
erase_chip_jedec(flash);
// dumb check if erase was successful.
for (i = 0; i < total_size; i++) {
if (bios[i] != (uint8_t) 0xff) {
printf("ERASE FAILED @%d, val %02x!\n", i, bios[i]);
return -1;
}
}
printf("Programming page: ");
for (i = 0; i < total_size / page_size; i++) {
printf("%04d at address: 0x%08x", i, i * page_size);
write_page_write_jedec(bios, buf + i * page_size,
bios + i * page_size, page_size);
printf("\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b");
}
printf("\n");
protect_jedec(bios);
return 0;
}
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