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FAT32: fix support for superfloppy-format (PBR)

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"Superfloppy" format (in U-Boot called PBR) did not work for FAT32 as
the file system type string is at a different location. Add support
for FAT32.

Signed-off-by: Wolfgang Denk <wd@denx.de>
This commit is contained in:
Wolfgang Denk 2010-07-19 11:36:57 +02:00
parent a17c548b53
commit 66c2d73cfc
3 changed files with 10 additions and 4 deletions
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4
disk/part_dos.c
View file

@ -77,8 +77,10 @@ static int test_block_type(unsigned char *buffer)
(buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) ) {
return (-1);
} /* no DOS Signature at all */
if(strncmp((char *)&buffer[DOS_PBR_FSTYPE_OFFSET],"FAT",3)==0)
if (strncmp((char *)&buffer[DOS_PBR_FSTYPE_OFFSET],"FAT",3)==0 ||
strncmp((char *)&buffer[DOS_PBR32_FSTYPE_OFFSET],"FAT32",5)==0) {
return DOS_PBR; /* is PBR */
}
return DOS_MBR; /* Is MBR */
}

1
disk/part_dos.h
View file

@ -35,6 +35,7 @@
#define DOS_PART_TBL_OFFSET 0x1be
#define DOS_PART_MAGIC_OFFSET 0x1fe
#define DOS_PBR_FSTYPE_OFFSET 0x36
#define DOS_PBR32_FSTYPE_OFFSET 0x52
#define DOS_PBR_MEDIA_TYPE_OFFSET 0x15
#define DOS_MBR 0
#define DOS_PBR 1

7
fs/fat/fat.c
View file

@ -50,6 +50,7 @@ static int cur_part = 1;
#define DOS_PART_TBL_OFFSET 0x1be
#define DOS_PART_MAGIC_OFFSET 0x1fe
#define DOS_FS_TYPE_OFFSET 0x36
#define DOS_FS32_TYPE_OFFSET 0x52
int disk_read (__u32 startblock, __u32 getsize, __u8 * bufptr)
{
@ -94,7 +95,8 @@ fat_register_device(block_dev_desc_t *dev_desc, int part_no)
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)) {
} else if (strncmp((char *)&buffer[DOS_FS_TYPE_OFFSET], "FAT", 3)==0 ||
strncmp((char *)&buffer[DOS_FS32_TYPE_OFFSET],"FAT32",5)==0) {
/* ok, we assume we are on a PBR only */
cur_part = 1;
part_offset = 0;
@ -105,7 +107,8 @@ fat_register_device(block_dev_desc_t *dev_desc, int part_no)
}
#else
if (!strncmp((char *)&buffer[DOS_FS_TYPE_OFFSET],"FAT",3)) {
if ((strncmp((char *)&buffer[DOS_FS_TYPE_OFFSET], "FAT", 3) == 0) ||
(strncmp((char *)&buffer[DOS_FS32_TYPE_OFFSET], "FAT32", 5) == 0)) {
/* ok, we assume we are on a PBR only */
cur_part = 1;
part_offset = 0;