[U-Boot] [PATCH] Support for devices with FAT32 PBR

[Igor Luri]

This patch adds support for devices that have a FAT32 PBR.

Signed-off-by: Igor Luri <iluri at aotek.es>

---
 disk/part_dos.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/disk/part_dos.c b/disk/part_dos.c
index 887b75e..d91f773 100644
--- a/disk/part_dos.c
+++ b/disk/part_dos.c
@@ -77,7 +77,8 @@ 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_PBR_FAT32_FSTYPE_OFFSET],"FAT32",5)==0) )
                return DOS_PBR; /* is PBR */
        return DOS_MBR;     /* Is MBR */
 }
-- 
1.5.4.3

---
 disk/part_dos.h |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/disk/part_dos.h b/disk/part_dos.h
index ac93f20..6383c58 100644
--- a/disk/part_dos.h
+++ b/disk/part_dos.h
@@ -35,6 +35,7 @@
 #define DOS_PART_TBL_OFFSET    0x1be
 #define DOS_PART_MAGIC_OFFSET  0x1fe
 #define DOS_PBR_FSTYPE_OFFSET  0x36
+#define DOS_PBR_FAT32_FSTYPE_OFFSET    0x52
 #define DOS_PBR_MEDIA_TYPE_OFFSET      0x15
 #define DOS_MBR        0
 #define DOS_PBR        1
-- 
1.5.4.3

---
 fs/fat/fat.c |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/fs/fat/fat.c b/fs/fat/fat.c
index 2445f1e..4da4351 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_FS_FAT32_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) ||
+                          !strncmp((char *)&buffer[DOS_FS_FAT32_TYPE_OFFSET], "FAT32", 5)) {
                /* 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) ||
+               !strncmp((char *)&buffer[DOS_FS_FAT32_TYPE_OFFSET], "FAT32", 5) ) {
                /* ok, we assume we are on a PBR only */
                cur_part = 1;
                part_offset = 0;
-- 
1.5.4.3




-- 
Igor Luri
R&D Software Department
Fagor Aotek S. Coop.
P. O. Box 144
E-20500 Mondragón-Arrasate
Tel.    ++34 943 71 92 00 
        ++34 943 71 92 01 (Ext. 44268)
Fax.    ++34 943 79 92 03
www.aotek.es