[U-Boot] [PATCH 1/6] mtd: add writebufsize field to mtd_info struct

[Holger Brunck]

This field will be used to indicate the write buffer size
of the MTD device. UBI will set it's minimal I/O unit size
(min_io_size) to the indicated write buffer size. By this
change we intend to fix failed recovery of UBIFS partitions
we currently observe on NOR flash when mounting the partition
after unclean unmount.

Currently the min_io_size is set to mtd->writesize (which is 1
byte for NOR flash). But flash programming is often done from
prepared write buffer containing multiple bytes and is performed
in one programming operation which could be interrupted by a power
cut or a system reset causing corrupted (partially written) areas
in a flash sector. Knowing the size of potentially corrupted areas
UBIFS scanning and recovery algorithms are able to perform
successful recovery.

Signed-off-by: Holger Brunck <holger.brunck at keymile.com>
---
 include/linux/mtd/mtd.h |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index 3b18d7d..14d6f70 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -129,6 +129,17 @@ struct mtd_info {
 	 */
 	u_int32_t writesize;
 
+	/*
+	 * Size of the write buffer used by the MTD. MTD devices having a write
+	 * buffer can write multiple writesize chunks at a time. E.g. while
+	 * writing 4 * writesize bytes to a device with 2 * writesize bytes
+	 * buffer the MTD driver can (but doesn't have to) do 2 writesize
+	 * operations, but not 4. Currently, all NANDs have writebufsize
+	 * equivalent to writesize (NAND page size). Some NOR flashes do have
+	 * writebufsize greater than writesize.
+	 */
+	u_int32_t writebufsize;
+
 	u_int32_t oobsize;   /* Amount of OOB data per block (e.g. 16) */
 	u_int32_t oobavail;  /* Available OOB bytes per block */
 
-- 
1.7.0.5