[i.MX28 GPMI] problem overwriting all-0xff data in NAND

[Artem Bityutskiy]

On Tue, 2011-07-19 at 10:12 +0800, Huang Shijie wrote:
> hi  Lothar:
> > On Mon, Jul 18, 2011 at 03:13:27PM +0200, Lothar Waßmann wrote:
> >> Hi,
> >>
> >> with the gpmi-nfc driver for imx28 from Shawn Guo on a TX28 I
> > To be clear, the author of gpmi-nfc driver is Huang Shijie (Cc-ed).
> >
> > Regards,
> > Shawn
> >
> >> encountered some problems with jffs2 when overwriting pages that have
> >> been written with 0xff (e.g. from padding from the file system image
> >> file).
> The GPMI driver now does not support the JFFS2 very well.
> The JFFS2 will write the OOB, while the BCH of GPMI will use the OOB too.
> So I have to disable the JFFS2 to use the OOB. I have not finish the 
> code about it now.
> 
> I recommend you use the UBIFS. But the latest version of GPMI driver 
> meets a DMA bug.
> I am debugging the DMA bug now. and I will send it out when i fix it.

This is a different issue. You refer to the "GPMI-controlled flash has
no space in OOB for JFFS2". Lothar's issue is about "GPMI-controlled
flash does not allow writing 0xFFs and then writing something else",
which is very normal.

-- 
Best Regards,
Artem Bityutskiy