[U-Boot] [PATCH 0/3] Add raw read support and use it in pxa3xx NAND driver

[Jagan Teki]

On Tue, Oct 23, 2018 at 4:35 PM Jagan Teki <jagan at amarulasolutions.com> wrote:
>
> On Thu, Oct 11, 2018 at 9:16 PM Miquel Raynal <miquel.raynal at bootlin.com> wrote:
> >
> > When using 2kiB-pages NAND chips requesting an 8-bit strength ECC, the
> > layout used is a bit particular and it happens that the ECC engine
> > tries to correct uncorrectable errors on empty pages, producing
> > bitflips.
> >
> > To avoid such situation, raw read support is added to the pxa3xx_nand
> > driver, and then used to re-read the page (in raw mode) upon
> > uncorrectable error detection to know if there is an actual ECC
> > mismatch or if the page is empty. This way we avoid seeing the
> > bitflips created by the hardware ECC engine.
> >
> > Once this done, we can revert the hack that was done in the driver to
> > enlarge the last spare area for this layout to 64B instead of 32B,
> > breaking U-Boot/Linux compatibility and preventing the BootROM to boot
> > from NAND.
> >
> > Thanks,
> > Miquèl
> >
> >
> > Miquel Raynal (3):
> >   mtd: nand: pxa3xx: add raw read support
> >   mtd: nand: pxa3xx: re-read a page in raw mode on uncorrectable error
> >   mtd: rawnand: pxa3xx: fix 2kiB pages with 8b strength chips layout
>
> Acked-by: Jagan Teki <jagan at openedev.com>

Applied to u-boot-spi/master