On Monday 14 May 2007, Andrea Conti wrote:
> Hi,
>
> > The only thing that confuses me is that this is an 8bit chip,
> > but this ecclayout looks more like a 16bit one than an 8bit one,
>
> The 8, 16 or 64 bits here refer to the size of the OOB area for each
> page, not to the chip data bus width: the HY27US08121A has 512 bit pages
> with a 16 bit OOB area.
that explains it, thanks
>
> > When I mount the partition I no longer get complaints about bad blocks
> > or any of the other odd messages I used to get, but I get no files in
> > the partition.  Yet the first block contains the same information it
> > has always contained, i.e. the file header for the file "kernel".
>
> Pardon me for the obvious question, but can the board boot routerOS from
> the partition you're working with?
Yes, I reflashed it using their utility and yes it does boot.
> Apart from not getting error messages, does df show any bad blocks on
> the partition? Is the page containing the kernel header actually marked
> as valid (you have to look at the OOB data)?
df and nanddump and the dmesg messages at both mtd driver and yaffs mount
all say no errors.

David
>
> If df shows bad blocks you have to recreate the data, since it has
> probably been destroyed in a previous mount attempt. BTW, it seems that
> even when mounting with -o ro pages with bad ECC are marked as
> invalid... this sucks.
>
> Andrea
>
>
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