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disk: dos: Infer MBR partition sector size from underlying drive sector size

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Block devices with 4k sectors imply the MBR sectors are also 4k instead
of regular 512B. Avoid hard-coding the 512B sector size and isntead read
the current block device sector size from it, and if the sector size is
larger than 512B, use the block device sector size.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Marek Vasut 2023-08-14 01:48:45 +02:00 • committed by Tom Rini
parent 3f9cff669b
commit e2b5cc608b
1 changed files with 14 additions and 3 deletions
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17
disk/part_dos.c
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@ -207,8 +207,9 @@ static int part_get_info_extended(struct blk_desc *dev_desc,
struct disk_partition *info, uint disksig)
{
ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
struct disk_partition wdinfo = { 0 };
dos_partition_t *pt;
int i;
int i, ret;
int dos_type;
/* set a maximum recursion level */
@ -236,6 +237,10 @@ static int part_get_info_extended(struct blk_desc *dev_desc,
disksig = get_unaligned_le32(&buffer[DOS_PART_DISKSIG_OFFSET]);
#endif
ret = part_get_info_whole_disk(dev_desc, &wdinfo);
if (ret)
return ret;
/* Print all primary/logical partitions */
pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
for (i = 0; i < 4; i++, pt++) {
@ -247,7 +252,10 @@ static int part_get_info_extended(struct blk_desc *dev_desc,
(pt->sys_ind != 0) &&
(part_num == which_part) &&
(ext_part_sector == 0 || is_extended(pt->sys_ind) == 0)) {
info->blksz = DOS_PART_DEFAULT_SECTOR;
if (wdinfo.blksz > DOS_PART_DEFAULT_SECTOR)
info->blksz = wdinfo.blksz;
else
info->blksz = DOS_PART_DEFAULT_SECTOR;
info->start = (lbaint_t)(ext_part_sector +
get_unaligned_le32(pt->start4));
info->size = (lbaint_t)get_unaligned_le32(pt->size4);
@ -289,7 +297,10 @@ static int part_get_info_extended(struct blk_desc *dev_desc,
if (dos_type == DOS_PBR) {
info->start = 0;
info->size = dev_desc->lba;
info->blksz = DOS_PART_DEFAULT_SECTOR;
if (wdinfo.blksz > DOS_PART_DEFAULT_SECTOR)
info->blksz = wdinfo.blksz;
else
info->blksz = DOS_PART_DEFAULT_SECTOR;
info->bootable = 0;
strcpy((char *)info->type, "U-Boot");
#if CONFIG_IS_ENABLED(PARTITION_UUIDS)