On Thursday 29 March 2012 13:58:05 Ezio Zhang wrote:
> when start up,yaffs scan every chunk of a block that the summary not
> written.
> when it read the chunk's oob,if it is an empty chunk,the tags it read if
> full of 0xff,so the flag chunk_used should not be 0 and the judgement of
> "if (!tag.chunk_used)" should never enter, am i right?

Erased flash starts off 0xff and can then be changed by setting 1 bits to 0 
bits.

If the tags are full of 0xff then chunk_used should be 0.

> so in my understanding ,the function dev->param.read_chunk_tags_fn shoud do
> something rather than copy data from flash?
>
> and when writing data to flash,i cannot skip one or more chunks then  write
> another one?

I don't understand quite what you mean here can you give a slightly more 
detailed descriprion.

> thansk very much.
> ----
> Regards,
> Ezio.