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authorStephen Warren <swarren@nvidia.com>2012-10-05 13:17:40 +0000
committerTom Rini <trini@ti.com>2012-10-08 11:15:04 -0700
commitd1efb6442a0a0eec1933fce500f69008e2df70fd (patch)
treefe9d39a29126ed3c638f877a89cb296821919cfa
parentbd1a7e3034006ec121d35d745fd455212a56f7fd (diff)
downloadu-boot-linaro-stable-d1efb6442a0a0eec1933fce500f69008e2df70fd.tar.gz
disk: part_dos: don't claim whole-disk FAT filesystems
Logically, a disk that contains a raw FAT filesystem does not in fact have a partition table. However, test_part_dos() was claiming that such disks did in fact have a DOS-style partition table. This caused get_device_and_partition() not to return a whole-disk disk_partition_t, since part_type != PART_TYPE_UNKNOWN. part_dos.c's print_partition_extended() detected the raw FAT filesystem condition and printed a fake partition table that encompassed the whole disk. However, part_dos.c's get_partition_info_extended() did not return any valid partitions in this case. This combination caused get_device_and_partition() not to find any valid partitions, and hence to return an error. Fix test_part_dos() not to claim that raw FAT filesystems are DOS partition tables. In turn, this causes get_device_and_partition() to return a whole-disk disk_partition_t, and hence the following commands work: fatls mmc 0 / fatls mmc 0:auto / An alternative would be to modify print_partition_extended() to detect raw FAT filesystems, just like print_partition_extended() does, and to return a fake partition in this case. However, this seems logically incorrect, and also duplicates code, since get_device_and_partition() falls back to returning a whole-disk partition when there is no partition table on the device. Signed-off-by: Stephen Warren <swarren@nvidia.com>
-rw-r--r--disk/part_dos.c21
1 files changed, 9 insertions, 12 deletions
diff --git a/disk/part_dos.c b/disk/part_dos.c
index c9a3e2bf0..5c454e65a 100644
--- a/disk/part_dos.c
+++ b/disk/part_dos.c
@@ -94,12 +94,13 @@ int test_part_dos (block_dev_desc_t *dev_desc)
{
ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
- if ((dev_desc->block_read(dev_desc->dev, 0, 1, (ulong *) buffer) != 1) ||
- (buffer[DOS_PART_MAGIC_OFFSET + 0] != 0x55) ||
- (buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) ) {
- return (-1);
- }
- return (0);
+ if (dev_desc->block_read(dev_desc->dev, 0, 1, (ulong *) buffer) != 1)
+ return -1;
+
+ if (test_block_type(buffer) != DOS_MBR)
+ return -1;
+
+ return 0;
}
/* Print a partition that is relative to its Extended partition table
@@ -117,17 +118,13 @@ static void print_partition_extended (block_dev_desc_t *dev_desc, int ext_part_s
return;
}
i=test_block_type(buffer);
- if(i==-1) {
+ if (i != DOS_MBR) {
printf ("bad MBR sector signature 0x%02x%02x\n",
buffer[DOS_PART_MAGIC_OFFSET],
buffer[DOS_PART_MAGIC_OFFSET + 1]);
return;
}
- if(i==DOS_PBR) {
- printf (" 1\t\t 0\t%10ld\t%2x\n",
- dev_desc->lba, buffer[DOS_PBR_MEDIA_TYPE_OFFSET]);
- return;
- }
+
/* Print all primary/logical partitions */
pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
for (i = 0; i < 4; i++, pt++) {