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nvram: handle nvram at varying offsets within the eraseblock (fixes Edimax PS-1208mfg with FLSH at offset 0)

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SVN-Revision: 22299
This commit is contained in:
Jo-Philipp Wich 2010-07-19 22:20:07 +00:00
parent c811398d00
commit f813a693fd
4 changed files with 22 additions and 6 deletions
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2
package/nvram/Makefile
View file

@ -8,7 +8,7 @@
include $(TOPDIR)/rules.mk
PKG_NAME:=nvram
PKG_RELEASE:=7
PKG_RELEASE:=8
PKG_BUILD_DIR := $(BUILD_DIR)/$(PKG_NAME)

1
package/nvram/src/cli.c
View file

@ -111,6 +111,7 @@ static int do_info(nvram_handle_t *nvram)
/* Show info */
printf("Magic: 0x%08X\n", hdr->magic);
printf("Length: 0x%08X\n", hdr->len);
printf("Offset: 0x%08X\n", nvram->offset);
printf("CRC8: 0x%02X (calculated: 0x%02X)\n",
hdr->crc_ver_init & 0xFF, crc);

21
package/nvram/src/nvram.c
View file

@ -142,7 +142,7 @@ static int _nvram_rehash(nvram_handle_t *h)
/* Get nvram header. */
nvram_header_t * nvram_header(nvram_handle_t *h)
{
return (nvram_header_t *) &h->mmap[NVRAM_START(nvram_erase_size)];
return (nvram_header_t *) &h->mmap[h->offset];
}
/* Get the value of an NVRAM variable. */
@ -337,10 +337,12 @@ int nvram_commit(nvram_handle_t *h)
/* Open NVRAM and obtain a handle. */
nvram_handle_t * nvram_open(const char *file, int rdonly)
{
int i;
int fd;
char *mtd = NULL;
nvram_handle_t *h;
nvram_header_t *header;
int offset = -1;
/* If erase size or file are undefined then try to define them */
if( (nvram_erase_size == 0) || (file == NULL) )
@ -361,15 +363,28 @@ nvram_handle_t * nvram_open(const char *file, int rdonly)
if( mmap_area != MAP_FAILED )
{
memset(mmap_area, 0xFF, NVRAM_START(nvram_erase_size));
for( i = 0; i <= ((nvram_erase_size - NVRAM_SPACE) / sizeof(uint32_t)); i++ )
{
if( ((uint32_t *)mmap_area)[i] == NVRAM_MAGIC )
{
offset = i * sizeof(uint32_t);
break;
}
}
if((h = (nvram_handle_t *) malloc(sizeof(nvram_handle_t))) != NULL)
if( offset < 0 )
{
free(mtd);
return NULL;
}
else if( (h = malloc(sizeof(nvram_handle_t))) != NULL )
{
memset(h, 0, sizeof(nvram_handle_t));
h->fd = fd;
h->mmap = mmap_area;
h->length = nvram_erase_size;
h->offset = offset;
header = nvram_header(h);

4
package/nvram/src/nvram.h
View file

@ -46,7 +46,8 @@ struct nvram_tuple {
struct nvram_handle {
int fd;
char *mmap;
unsigned long length;
unsigned int length;
unsigned int offset;
struct nvram_tuple *nvram_hash[257];
struct nvram_tuple *nvram_dead;
};
@ -113,7 +114,6 @@ char * nvram_find_staging(void);
/* NVRAM constants */
#define NVRAM_SPACE 0x8000
#define NVRAM_START(x) x - NVRAM_SPACE
#define NVRAM_MAGIC 0x48534C46 /* 'FLSH' */
#define NVRAM_VERSION 1