Re: [Yaffs] inband tag overhead

I aggree that, but YAFFS empty page alloc order is sequence, why page b
is not alloced for use ,the page c is alloced ?
if turn off inband tags, no such problem.


2008/11/10 Charles Manning <manningc2@actrix.gen.nz>

> On Saturday 08 November 2008 02:57:41 fs p wrote:
> > hi:
> >
> > use the nandsim emul 2k page flash , nanddump the device content,
> > found that : page a is filled with data ,but next page b is empty ,
> > and page c is filled with data , page d is empty , .page e is filled
> > with data ,etc
> > I mean is if use inband tag , there is some page empty betweent two
> page
> > which filled with data , or some problem else ?
>
> No.
>
> A "normal" layout puts the tags in some out of band area (eg. the
> spare/OOB
> area in NAND pages).
>
> Inband tags use a part of the data area to store the tags. So, if the page
> holds, say, 1024 bytes then that will store the tags + (1024 -
> sizeof(Tags))
> bytes of data.
>
> -- Charles
>
>