Re: [Yaffs] Yaffs2 and MLC NAND with Block size 256K

> -----Original Message-----
> From: yaffs-bounces@lists.aleph1.co.uk [mailto:yaffs-
> bounces@lists.aleph1.co.uk] On Behalf Of Amol Lad
> Sent: Tuesday, 19 August 2008 4:28 PM
> To: yaffs@lists.aleph1.co.uk
> Subject: [Yaffs] Yaffs2 and MLC NAND with Block size 256K
>
> Hi,
>
> I'm using a year old snapshot of Yaffs2 cvs tree. I want to know if
> there are any assumptions about the block size for 2K page NAND. For
> example, Samsung K9F4G08U0A is SLC NAND with 2K page size and 128K
> block size. Samsung K9G4G08U0A is MLC NAND with 2K page size and 256K
> block size (both have same device id - 0xDC)
>
> So, are there any assumptions about block size for 2K page ? or 256K
> block size will work as is..
>

The define YAFFS_CHUNKS_PER_BLOCK (from yaffs_guts.h) might be what
you're looking for. That, or dev->nChunksPerBlock if you're using
Yaffs-Direct.

If you've got no way of knowing whether it's a 128K block size or a 256K
block size, then you might be best off telling Yaffs to use a 256K block
size, and tweaking your NAND driver to send two erase commands (so 128K
NAND will behave like 256K NAND).

James