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[MTD] Improve heuristic for detecting wrong-endian RedBoot partition table

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Also limit the amount we scan to one eraseblock.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
This commit is contained in:
David Woodhouse 2007-02-10 09:58:31 +00:00
parent 11192146e5
commit 7ca353a428
1 changed files with 11 additions and 2 deletions
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13
drivers/mtd/redboot.c
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@ -94,7 +94,16 @@ static int parse_redboot_partitions(struct mtd_info *master,
* (NOTE: this is 'size' not 'data_length'; size is
* the full size of the entry.)
*/
if (swab32(buf[i].size) == master->erasesize) {
/* RedBoot can combine the FIS directory and
config partitions into a single eraseblock;
we assume wrong-endian if either the swapped
'size' matches the eraseblock size precisely,
or if the swapped size actually fits in an
eraseblock while the unswapped size doesn't. */
if (swab32(buf[i].size) == master->erasesize ||
(buf[i].size > master->erasesize
&& swab32(buf[i].size) < master->erasesize)) {
int j;
/* Update numslots based on actual FIS directory size */
numslots = swab32(buf[i].size) / sizeof (struct fis_image_desc);
@ -122,7 +131,7 @@ static int parse_redboot_partitions(struct mtd_info *master,
swab32s(&buf[j].desc_cksum);
swab32s(&buf[j].file_cksum);
}
} else {
} else if (buf[i].size < master->erasesize) {
/* Update numslots based on actual FIS directory size */
numslots = buf[i].size / sizeof(struct fis_image_desc);
}