[U-Boot] Problem with attaching UBI partition

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

On Tue, 2016-03-01 at 16:35 +0100, Stefan Roese wrote:
> Hi!

Hi Stefan,

> 
> (adding Marek to Cc again)
> 
> On 01.03.2016 14:38, Chin Liang See wrote:
> > 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?
> 
> I think we are talking about different things here. I'm referring
> to Marek mentioning the cache problem (S-bit related) on current
> SoCFPGA U-Boot mainline. With caches enabled you can experience
> problems on QSPI and on USB (reported from Marek - I didn't test
> USB yet).
> 

For QSPI, wonder the issue is on the read or write?

> So do you have any updated on this cache / S-bit problem? 

I am still debugging this as I notice the hub is not able to detect the
mass storage. This is only for certain pen drive.

> Or can you
> use QSPI NOR without any issues on current mainline U-Boot with
> caches enabled on your platforms?
> 

The issue I have is on USB only. For NOR, I can ubifsmount and
ubifsload with Micron NOR flash without issue. This is with dcache
enabled

Thanks
Chin Liang



> Thanks,
> Stefan
>