On Saturday 11 November 2006 03:53, Vitaly Wool wrote:
> On 11/10/06, Aubrey <aubreylee@gmail.com> wrote:
> > Hi Vitaly,
> >
> > On 11/10/06, Vitaly Wool <vitalywool@gmail.com> wrote:
> > > this is a known issue on 2.6.18 kernels. It is caused by the MTD layer
> > > rework and corresponding yaffs-mtd layer modifications. Namely, an
> > > additional translation had to be implemented for OOB area for 512b
> > > page chips.
> >
> > Oh, thanks very much to point it out.
> > So, What should I do to fix this issue? Upgrade mtd directory in the
> > kernel to the newest version? ( I think I have already had the newest
> > yaffs), thanks again to give me any suggestions.
>
> You'll have to do some code hacking to speed things up. I.e. you'll
> need to set up your OOB layout according to SmartMedia spec and then
> you'll be able to remove the translation shim in yaffs code.

It is important to understand this:

The mtd NAND driver is generic code that is parameterised by configuration 
tables to make it flexible. This gives an (almost/often) out of the box 
experience, and IMHO, is pretty slick code, but there's a cost associated 
with the flexibility.

A custom driver can be a lot faster, but then it won't be generic any more.

Most people who want fast NAND speed end up writing their own custom drivers 
to maximise ransfer with their hardware. 

-- CHarles