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/*
* (C) Copyright 2004
* Jian Zhang, Texas Instruments, jzhang@ti.com.
* (C) Copyright 2000-2004
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Andreas Heppel <aheppel@sysgo.de>
* See file CREDITS for list of people who contributed to this
* project.
*
* 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., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
/* #define DEBUG */
#include <common.h>
#if defined(CFG_ENV_IS_IN_NAND) /* Environment is in Nand Flash */
#include <command.h>
#include <environment.h>
#include <linux/stddef.h>
#include <linux/mtd/nand.h>
#if ((CONFIG_COMMANDS&(CFG_CMD_ENV|CFG_CMD_NAND)) == (CFG_CMD_ENV|CFG_CMD_NAND))
#define CMD_SAVEENV
#endif
#if defined(CFG_ENV_SIZE_REDUND)
#error CFG_ENV_SIZE_REDUND not supported yet
#endif
#if defined(CFG_ENV_ADDR_REDUND)
#error CFG_ENV_ADDR_REDUND and CFG_ENV_IS_IN_NAND not supported yet
#endif
#ifdef CONFIG_INFERNO
#error CONFIG_INFERNO not supported yet
#endif
/* references to names in cmd_nand.c */
#define NANDRW_READ 0x01
#define NANDRW_WRITE 0x00
#define NANDRW_JFFS2 0x02
#define NANDRW_JFFS2_SKIP 0x04
unsigned int env_blk_pos = 0; /*searched env block position*/
extern struct nand_chip nand_dev_desc[];
int nand_rw (struct nand_chip* nand, int cmd,
size_t start, size_t len,
size_t * retlen, u_char * buf);
int nand_erase(struct nand_chip* nand, size_t ofs,
size_t len, int clean);
int check_block_table(struct nand_chip *nand, unsigned int scan);
/* references to names in env_common.c */
extern uchar default_environment[];
extern int default_environment_size;
char * env_name_spec = "NAND";
#ifdef ENV_IS_EMBEDDED
extern uchar environment[];
env_t *env_ptr = (env_t *)(&environment[0]);
#else /* ! ENV_IS_EMBEDDED */
env_t *env_ptr = 0;
#endif /* ENV_IS_EMBEDDED */
/* local functions */
static void use_default(void);
DECLARE_GLOBAL_DATA_PTR;
uchar env_get_char_spec (int index)
{
return ( *((uchar *)(gd->env_addr + index)) );
}
/* this is called before nand_init()
* so we can't read Nand to validate env data.
* Mark it OK for now. env_relocate() in env_common.c
* will call our relocate function which will does
* the real validation.
*/
int env_init(void)
{
gd->env_addr = (ulong)&default_environment[0];
gd->env_valid = 1;
return (0);
}
#ifdef CMD_SAVEENV
int saveenv(void)
{
int ret = 0;
unsigned int total, i, index;
NAND_ENABLE_CE(nand_dev_desc);
ret = check_block_table(nand_dev_desc, 0);
NAND_DISABLE_CE(nand_dev_desc);
if (ret) {
printf("bbt not found! Write ENV is rejected\n");
return 1;
}
total = CFG_ENV_SIZE;
index = (env_blk_pos+1)%CFG_ENV_BLOCK_LENGTH;
printf ("Erasing next Nand block 0x%x\n", index);
for (i = 0; i < CFG_ENV_BLOCK_LENGTH; i++) {
if (!nand_dev_desc[0].isbadblock((nand_dev_desc + 0),
nand_dev_desc[0].erasesize * (CFG_ENV_BLOCK_OFFSET + index%CFG_ENV_BLOCK_LENGTH))) {
if (nand_erase(nand_dev_desc + 0,
nand_dev_desc[0].erasesize * (CFG_ENV_BLOCK_OFFSET + index%CFG_ENV_BLOCK_LENGTH),
(CFG_ENV_SIZE/nand_dev_desc[0].erasesize) +
((CFG_ENV_SIZE%nand_dev_desc[0].erasesize) ? nand_dev_desc[0].erasesize : 0), 0)) {
/* fixme add bad block into bbt */
puts ("Erasing Nand next block fail..");
return 1;
} else {
ret = 1;
break;
}
}
index++;
}
if (!ret)
return 1;
/*printf ("write nand env_ptr addr 0x%x\n", (unsigned int)env_ptr);*/
ret = nand_rw(nand_dev_desc + 0,
NANDRW_WRITE | NANDRW_JFFS2, nand_dev_desc[0].erasesize *
(CFG_ENV_BLOCK_OFFSET + index%CFG_ENV_BLOCK_LENGTH), CFG_ENV_SIZE,
&total, (u_char *)env_ptr);
//ret = WMTSaveImageToNAND(nand_dev_desc[0].erasesize * CFG_ENV_BLOCK_OFFSET,
//(u_char*)env_ptr, CFG_ENV_SIZE, 1);
if (ret || total != CFG_ENV_SIZE) {
printf ("ret =0x%x total= 0x%x\n", (int) ret, total);
return 1;
}
printf ("Erase original Nand env_blk_pos=0x%x", env_blk_pos);
if (!nand_dev_desc[0].isbadblock((nand_dev_desc + 0),
nand_dev_desc[0].erasesize * (CFG_ENV_BLOCK_OFFSET + env_blk_pos))) {
if (nand_erase(nand_dev_desc + 0,
nand_dev_desc[0].erasesize * (CFG_ENV_BLOCK_OFFSET + env_blk_pos),
(CFG_ENV_SIZE/nand_dev_desc[0].erasesize) +
((CFG_ENV_SIZE%nand_dev_desc[0].erasesize) ? nand_dev_desc[0].erasesize : 0), 0)) {
/* fixme add bad block into bbt */
puts ("Erasing Nand original block fail..");
return 1;
} else {
env_blk_pos++;
puts (" ...done\n");
return 0;
}
}
puts ("original nand env block is bad block\n");
return 1;
}
#endif /* CMD_SAVEENV */
void env_relocate_spec (void)
{
#if !defined(ENV_IS_EMBEDDED)
int ret = 0;
unsigned int total, i = 0;
total = 0;
/*env_blk_pos = 0;*/
/*WMTLoadImageFormNAND(nand_dev_desc + 0,
nand_dev_desc[0].erasesize * CFG_ENV_BLOCK_OFFSET,
(u_char*)env_ptr, CFG_ENV_SIZE);*/
NAND_ENABLE_CE(nand_dev_desc);
ret = check_block_table(nand_dev_desc, 0);
NAND_DISABLE_CE(nand_dev_desc);
if (ret) {
printf("bbt not found! Search ENV is rejected\n");
return use_default();
}
for (i = 0; i < (CFG_ENV_BLOCK_LENGTH*2); i++) {
/*printf("i = %d\n", i);*/
if (nand_dev_desc[0].isbadblock((nand_dev_desc + 0),
nand_dev_desc[0].erasesize * (CFG_ENV_BLOCK_OFFSET + i%CFG_ENV_BLOCK_LENGTH))) {
printf(" search env block = 0x%x+1 is bad\n", env_blk_pos);
continue;
}
/*printf("i1 = %d\n", i);*/
ret = nand_rw(nand_dev_desc + 0, NANDRW_READ | NANDRW_JFFS2 | NANDRW_JFFS2_SKIP,
nand_dev_desc[0].erasesize * (CFG_ENV_BLOCK_OFFSET + i%CFG_ENV_BLOCK_LENGTH),
CFG_ENV_SIZE, &total, (u_char*)env_ptr);
if (ret || (total != CFG_ENV_SIZE)) {
printf ("ret =0x%x total= 0x%x\n", (int) ret, total);
env_blk_pos = 0;
return use_default();
}
if ((env_ptr->crc == 0xFFFFFFFF) && (i < CFG_ENV_BLOCK_LENGTH))
continue;
if (crc32(0, env_ptr->data, ENV_SIZE) != env_ptr->crc) {
if (i < (CFG_ENV_BLOCK_LENGTH*2 - 1))
continue;
printf("could not search env nand block\n");
env_blk_pos = 0;
return use_default();
} else {
env_blk_pos = i%CFG_ENV_BLOCK_LENGTH;
printf("env is read from nand block 0x%x+1 \n", env_blk_pos);
return;
}
}
return use_default();
#endif /* ! ENV_IS_EMBEDDED */
}
static void use_default()
{
puts ("*** Warning - bad CRC or NAND, using default environment\n\n");
if (default_environment_size > CFG_ENV_SIZE){
puts ("*** Error - default environment is too large\n\n");
return;
}
memset (env_ptr, 0, sizeof(env_t));
memcpy (env_ptr->data,
default_environment,
default_environment_size);
env_ptr->crc = crc32(0, env_ptr->data, ENV_SIZE);
gd->env_valid = 1;
}
#endif /* CFG_ENV_IS_IN_NAND */
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