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-rw-r--r--fs/fat/fat.c34
1 files changed, 22 insertions, 12 deletions
diff --git a/fs/fat/fat.c b/fs/fat/fat.c
index 3824e1d..c068a84 100644
--- a/fs/fat/fat.c
+++ b/fs/fat/fat.c
@@ -70,10 +70,11 @@ int
fat_register_device(block_dev_desc_t *dev_desc, int part_no)
{
unsigned char buffer[SECTOR_SIZE];
+ disk_partition_t info;
if (!dev_desc->block_read)
return -1;
- cur_dev=dev_desc;
+ cur_dev = dev_desc;
/* check if we have a MBR (on floppies we have only a PBR) */
if (dev_desc->block_read (dev_desc->dev, 0, 1, (ulong *) buffer) != 1) {
printf ("** Can't read from device %d **\n", dev_desc->dev);
@@ -95,25 +96,34 @@ fat_register_device(block_dev_desc_t *dev_desc, int part_no)
defined(CONFIG_CMD_USB) || \
(defined(CONFIG_MMC) && defined(CONFIG_LPC2292)) || \
defined(CONFIG_SYSTEMACE) )
- disk_partition_t info;
- if(!get_partition_info(dev_desc, part_no, &info)) {
- part_offset = info.start;
- cur_part = part_no;
- }
- else {
- printf ("** Partition %d not valid on device %d **\n",part_no,dev_desc->dev);
- return -1;
- }
+ /* First we assume, there is a MBR */
+ if (!get_partition_info (dev_desc, part_no, &info)) {
+ part_offset = info.start;
+ cur_part = part_no;
+ } else if (!strncmp((char *)&buffer[DOS_FS_TYPE_OFFSET], "FAT", 3)) {
+ /* ok, we assume we are on a PBR only */
+ cur_part = 1;
+ part_offset = 0;
+ } else {
+ printf ("** Partition %d not valid on device %d **\n", part_no, dev_desc->dev);
+ return -1;
+ }
#else
+ if(!strncmp((char *)&buffer[DOS_FS_TYPE_OFFSET],"FAT",3)) {
+ /* ok, we assume we are on a PBR only */
+ cur_part = 1;
+ part_offset = 0;
+ info.start = part_offset;
+ } else {
/* FIXME we need to determine the start block of the
* partition where the DOS FS resides. This can be done
* by using the get_partition_info routine. For this
* purpose the libpart must be included.
*/
- part_offset=32;
+ part_offset = 32;
cur_part = 1;
-#endif
}
+#endif
return 0;
}