On Thursday 24 March 2011 06:41:32 srimugunthan dhandapani wrote:
> Hi all,
> We are using a flash card with 32 KB page size and hardware generates ecc
>  for every 512 bytes . There is extra 8 bytes  available for storing meta
> information for the 512 bytes
> It is not possible to directly write on to the spare area.  As I
> understand, we can ask yaffs to use in-band tags for every 512 bytes.
>  Is it required for the driver to implement the write_oob or write_ecc
> function  for mounting yaffs  ?.
>
> Of the mtd functions,  read, write, erase, write_oob ,read_oob, sync and
> mark_block_bad , we have implemented the basic read write and erase. What
> other functions are absolutely essential for using yaffs and which can be
> stubs?.

Have a look at the mtd  functions used by yaffs_mtdif2.c