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| author |   Dan Brown <dan_brown@ieee.org> | 2005-04-07 15:22:58 +0100 |
|---|---|---|
| committer |   Thomas Gleixner <tglx@mtd.linutronix.de> | 2005-05-23 13:11:44 +0200 |
| commit | abc37e6771ec92bb4c531d218ad572afbef6aa21 (patch) | |
| tree | cc30e91741b76c94380748d5c6c0cb82d31a7e3f | |
| parent | [MTD] DiskOnChip: Fix compile w/o CONFIG_MTD_PARTITIONS. (diff) | |
| download | linux-dev-abc37e6771ec92bb4c531d218ad572afbef6aa21.tar.xz linux-dev-abc37e6771ec92bb4c531d218ad572afbef6aa21.zip | |
[MTD] DiskOnChip: Add some comments
Add helpful comment about oobfree so I can't claim two years from
now that I don't remember what I was thinking.
Signed-off-by: Dan Brown <dan_brown@ieee.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| -rw-r--r-- | drivers/mtd/nand/diskonchip.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/mtd/nand/diskonchip.c b/drivers/mtd/nand/diskonchip.c index 9f33f335a39d..fdb5d4ad3d52 100644 --- a/drivers/mtd/nand/diskonchip.c +++ b/drivers/mtd/nand/diskonchip.c @@ -16,7 +16,7 @@ * * Interface to generic NAND code for M-Systems DiskOnChip devices * - * $Id: diskonchip.c,v 1.53 2005/04/07 13:39:13 dbrown Exp $ + * $Id: diskonchip.c,v 1.54 2005/04/07 14:22:55 dbrown Exp $ */ #include <linux/kernel.h> @@ -1049,6 +1049,16 @@ static int doc200x_correct_data(struct mtd_info *mtd, u_char *dat, u_char *read_ //u_char mydatabuf[528]; +/* The strange out-of-order .oobfree list below is a (possibly unneeded) + * attempt to retain compatibility. It used to read: + * .oobfree = { {8, 8} } + * Since that leaves two bytes unusable, it was changed. But the following + * scheme might affect existing jffs2 installs by moving the cleanmarker: + * .oobfree = { {6, 10} } + * jffs2 seems to handle the above gracefully, but the current scheme seems + * safer. The only problem with it is that any code that parses oobfree must + * be able to handle out-of-order segments. + */ static struct nand_oobinfo doc200x_oobinfo = { .useecc = MTD_NANDECC_AUTOPLACE, .eccbytes = 6, |