From 66c2d73cfc901aa35e0331b2fd710b250151f966 Mon Sep 17 00:00:00 2001
From: Wolfgang Denk <wd@denx.de>
Date: Mon, 19 Jul 2010 11:36:57 +0200
Subject: [PATCH] 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>
---
disk/part_dos.c | 4 +++-
disk/part_dos.h | 3 ++-
fs/fat/fat.c | 7 +++++--
3 files changed, 10 insertions(+), 4 deletions(-)
diff --git a/disk/part_dos.c b/disk/part_dos.c
index 887b75ec887..2de1bb83b7d 100644
--- 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 ac93f20b3e6..195a32cb388 100644
--- 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 6b3a2742e21..5b9ec2a4ac0 100644
--- 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;
--
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