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

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git-svn-id: svn://svn.openwrt.org/openwrt/trunk@22299 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
jow
2010-07-19 22:20:07 +00:00
parent a7a1dcb877
commit 98b06e803d
4 changed files with 22 additions and 6 deletions
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21
package/nvram/src/nvram.c
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@@ -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);