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Support for redundant environment in NAND Flash.

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This commit is contained in:
Markus Klotzbuecher 2006-03-20 18:02:44 +01:00 committed by Markus Klotzbcher
parent 5536b2b5a9
commit e443c944cf
4 changed files with 126 additions and 13 deletions
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11
README
View File

@ -1946,6 +1946,17 @@ to save the current settings.
These two #defines specify the offset and size of the environment
area within the first NAND device.
- CFG_ENV_OFFSET_REDUND
This setting describes a second storage area of CFG_ENV_SIZE
size used to hold a redundant copy of the environment data,
so that there is a valid backup copy in case there is a
power failure during a "saveenv" operation.
Note: CFG_ENV_OFFSET and CFG_ENV_OFFSET_REDUND must be aligned
to a block boundary, and CFG_ENV_SIZE must be a multiple of
the NAND devices block size.
- CFG_SPI_INIT_OFFSET
Defines offset to the initial SPI buffer area in DPRAM. The

115
common/env_nand.c
View File

@ -36,21 +36,19 @@
#include <command.h>
#include <environment.h>
#include <linux/stddef.h>
#include <malloc.h>
#include <nand.h>
#if ((CONFIG_COMMANDS&(CFG_CMD_ENV|CFG_CMD_NAND)) == (CFG_CMD_ENV|CFG_CMD_NAND))
#define CMD_SAVEENV
#elif defined(CFG_ENV_OFFSET_REDUND)
#error Cannot use CFG_ENV_OFFSET_REDUND without CFG_CMD_ENV & CFG_CMD_NAND
#endif
#if defined(CFG_ENV_SIZE_REDUND)
#error CFG_ENV_SIZE_REDUND not supported yet
#if defined(CFG_ENV_SIZE_REDUND) && (CFG_ENV_SIZE_REDUND != CFG_ENV_SIZE)
#error CFG_ENV_SIZE_REDUND should be the same as CFG_ENV_SIZE
#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
@ -99,7 +97,7 @@ int env_init(void)
{
DECLARE_GLOBAL_DATA_PTR;
gd->env_addr = (ulong)&default_environment[0];
gd->env_addr = (ulong)&default_environment[0];
gd->env_valid = 1;
return (0);
@ -110,9 +108,45 @@ int env_init(void)
* The legacy NAND code saved the environment in the first NAND device i.e.,
* nand_dev_desc + 0. This is also the behaviour using the new NAND code.
*/
#ifdef CFG_ENV_OFFSET_REDUND
int saveenv(void)
{
int total, ret = 0;
int total, ret = 0;
DECLARE_GLOBAL_DATA_PTR;
env_ptr->flags++;
total = CFG_ENV_SIZE;
if(gd->env_valid == 1) {
puts ("Erasing redundant Nand...");
if (nand_erase(&nand_info[0],
CFG_ENV_OFFSET_REDUND, CFG_ENV_SIZE))
return 1;
puts ("Writing to redundant Nand... ");
ret = nand_write(&nand_info[0], CFG_ENV_OFFSET_REDUND, &total,
(u_char*) env_ptr);
} else {
puts ("Erasing Nand...");
if (nand_erase(&nand_info[0],
CFG_ENV_OFFSET, CFG_ENV_SIZE))
return 1;
puts ("Writing to Nand... ");
ret = nand_write(&nand_info[0], CFG_ENV_OFFSET, &total,
(u_char*) env_ptr);
}
if (ret || total != CFG_ENV_SIZE)
return 1;
puts ("done\n");
gd->env_valid = (gd->env_valid == 2 ? 1 : 2);
return ret;
}
#else /* ! CFG_ENV_OFFSET_REDUND */
int saveenv(void)
{
int total, ret = 0;
puts ("Erasing Nand...");
if (nand_erase(&nand_info[0], CFG_ENV_OFFSET, CFG_ENV_SIZE))
@ -128,9 +162,64 @@ int saveenv(void)
puts ("done\n");
return ret;
}
#endif /* CFG_ENV_OFFSET_REDUND */
#endif /* CMD_SAVEENV */
#ifdef CFG_ENV_OFFSET_REDUND
void env_relocate_spec (void)
{
#if !defined(ENV_IS_EMBEDDED)
int crc1_ok = 0, crc2_ok = 0, total;
env_t *tmp_env1, *tmp_env2;
DECLARE_GLOBAL_DATA_PTR;
total = CFG_ENV_SIZE;
tmp_env1 = (env_t *) malloc(CFG_ENV_SIZE);
tmp_env2 = (env_t *) malloc(CFG_ENV_SIZE);
nand_read(&nand_info[0], CFG_ENV_OFFSET, &total,
(u_char*) tmp_env1);
nand_read(&nand_info[0], CFG_ENV_OFFSET_REDUND, &total,
(u_char*) tmp_env2);
crc1_ok = (crc32(0, tmp_env1->data, ENV_SIZE) == tmp_env1->crc);
crc2_ok = (crc32(0, tmp_env2->data, ENV_SIZE) == tmp_env2->crc);
if(!crc1_ok && !crc2_ok)
return use_default();
else if(crc1_ok && !crc2_ok)
gd->env_valid = 1;
else if(!crc1_ok && crc2_ok)
gd->env_valid = 2;
else {
/* both ok - check serial */
if(tmp_env1->flags == 255 && tmp_env2->flags == 0)
gd->env_valid = 2;
else if(tmp_env2->flags == 255 && tmp_env1->flags == 0)
gd->env_valid = 1;
else if(tmp_env1->flags > tmp_env2->flags)
gd->env_valid = 1;
else if(tmp_env2->flags > tmp_env1->flags)
gd->env_valid = 2;
else /* flags are equal - almost impossible */
gd->env_valid = 1;
}
free(env_ptr);
if(gd->env_valid == 1) {
env_ptr = tmp_env1;
free(tmp_env2);
} else {
env_ptr = tmp_env2;
free(tmp_env1);
}
#endif /* ! ENV_IS_EMBEDDED */
}
#else /* ! CFG_ENV_OFFSET_REDUND */
/*
* The legacy NAND code saved the environment in the first NAND device i.e.,
* nand_dev_desc + 0. This is also the behaviour using the new NAND code.
@ -143,14 +232,14 @@ void env_relocate_spec (void)
total = CFG_ENV_SIZE;
ret = nand_read(&nand_info[0], CFG_ENV_OFFSET, &total,
(u_char*) env_ptr);
if (ret || total != CFG_ENV_SIZE)
if (ret || total != CFG_ENV_SIZE)
return use_default();
if (crc32(0, env_ptr->data, ENV_SIZE) != env_ptr->crc)
return use_default();
#endif /* ! ENV_IS_EMBEDDED */
}
#endif /* CFG_ENV_OFFSET_REDUND */
static void use_default()
{
@ -158,7 +247,7 @@ static void use_default()
puts ("*** Warning - bad CRC or NAND, using default environment\n\n");
if (default_environment_size > CFG_ENV_SIZE){
if (default_environment_size > CFG_ENV_SIZE){
puts ("*** Error - default environment is too large\n\n");
return;
}
@ -168,7 +257,7 @@ static void use_default()
default_environment,
default_environment_size);
env_ptr->crc = crc32(0, env_ptr->data, ENV_SIZE);
gd->env_valid = 1;
gd->env_valid = 1;
}

1
include/configs/delta.h
View File

@ -282,6 +282,7 @@
/* #define CFG_ENV_IS_NOWHERE */
#define CFG_ENV_IS_IN_NAND 1
#define CFG_ENV_OFFSET 0x40000
#define CFG_ENV_OFFSET_REDUND 0x44000
#define CFG_ENV_SIZE 0x4000
#endif /* __CONFIG_H */

12
include/environment.h
View File

@ -69,6 +69,18 @@
# endif
#endif /* CFG_ENV_IS_IN_FLASH */
#if defined(CFG_ENV_IS_IN_NAND)
# ifndef CFG_ENV_OFFSET
# error "Need to define CFG_ENV_OFFSET when using CFG_ENV_IS_IN_NAND"
# endif
# ifndef CFG_ENV_SIZE
# error "Need to define CFG_ENV_SIZE when using CFG_ENV_IS_IN_NAND"
# endif
# ifdef CFG_ENV_OFFSET_REDUND
# define CFG_REDUNDAND_ENVIRONMENT
# endif
#endif /* CFG_ENV_IS_IN_NAND */
#ifdef CFG_REDUNDAND_ENVIRONMENT
# define ENV_HEADER_SIZE (sizeof(unsigned long) + 1)