[U-Boot] Problem with attaching UBI partition

[Stefan Roese <sr@denx.de>]

Hi!

(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).

So do you have any updated on this cache / S-bit problem? Or can you
use QSPI NOR without any issues on current mainline U-Boot with
caches enabled on your platforms?

Thanks,
Stefan