[U-Boot] Problem with attaching UBI partition

[Chin Liang See <clsee@altera.com>]

On Tue, 2016-03-01 at 08:23 +0100, Stefan Roese wrote:
> On 01.03.2016 07:53, Chin Liang See wrote:
> > On Mon, 2016-02-29 at 23:55 +0100, Marek Vasut wrote:
> > > On 02/24/2016 09:59 AM, Bakhvalov, Denis (Nokia - PL/Wroclaw)
> > > wrote:
> > > > Hello Heiko,
> > > > 
> > > > > Which U-Boot version? Which board?
> > > > 
> > > > This is U-Boot v2016.03-rc1. I have custom board with socfpga
> > > > Arria5
> > > > onboard.
> > > > 
> > > > > Where does this leading 0xff come from? There seems a problem
> > > > > with
> > > > > your spi nor flash driver?
> > > > 
> > > > Yes, you're right. I have problems with the driver. As I
> > > > mentioned
> > > > in
> > > > previous mail when I read the contents from the flash some data
> > > > is
> > > > corrupted.
> > > > 
> > > > How to find out if the problem is because U-Boot has no support
> > > > for
> > > > my flash (Spansion S25FL512S NOR flash with SPI) or I have not
> > > > proper
> > > > configured SPI in U-Boot?
> > > 
> > > I believe there is a problem with caches , which we still didn't
> > > identify. CCing Dinh and Chin, as they were the last ones looking
> > > into this problem.
> > > 
> > > For now, try doing "dcache off" before using the QSPI NOR.
> > > 
> > 
> > We managed to get it work for socfpga. One of the issue dragged me
> > long
> > is the CONFIG_SPI_FLASH_USE_4K_SECTORS. Need to ensure its not
> > defined
> > in the defconfig. Hope it helps
> 
> This is not clear to me. You mean you were able to reproduce and
> solve this cache (S-bit) related issue by disabling
> CONFIG_SPI_FLASH_USE_4K_SECTORS? This option is disabled for all
> SoCFPGA board in mainline.
> 
> Could you please explain in more details what exactly you did to
> solve this issue on SPI NOR?
> 

Nope, I am not replicating the issue. My board is having Micron instead
of Spansion flash. In previously, CONFIG_SPI_FLASH_USE_4K_SECTORS is
defined in socfpga as most serial NOR flash are supporting 4k sub
sector. With that, it would be good to ensure the 4K is undefined.

In this case, wonder any details on the failure? Intermittent?

Thanks
Chin Liang

> Thanks,
> Stefan
>