FAT32: fix support for superfloppy-format (PBR)

"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>

diff --git a/disk/part_dos.c b/disk/part_dos.c
index 887b75e..2de1bb8 100644 (file)
--- a/disk/part_dos.c
+++ b/disk/part_dos.c
@@ -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 */
 }
 

diff --git a/disk/part_dos.h b/disk/part_dos.h
index ac93f20..195a32c 100644 (file)
--- a/disk/part_dos.h
+++ b/disk/part_dos.h
@@ -28,13 +28,14 @@
 #ifdef CONFIG_ISO_PARTITION
 /* Make the buffers bigger if ISO partition support is enabled -- CD-ROMS
    have 2048 byte blocks */
-#define DEFAULT_SECTOR_SIZE   2048
+#define DEFAULT_SECTOR_SIZE    2048
 #else
 #define DEFAULT_SECTOR_SIZE    512
 #endif
 #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

diff --git a/fs/fat/fat.c b/fs/fat/fat.c
index 6b3a274..5b9ec2a 100644 (file)
--- a/fs/fat/fat.c
+++ b/fs/fat/fat.c
@@ -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;