[U-Boot] STM32F7 SD/MMC Card Driver - Testing/Review

[Philipp Rossak <embed3d@gmail.com>]

Hi Jaehoon,

I had a look in the include/mmc.h file and there are different types of 
cmd 6 command defined:

ACMD6: Sets Bus width --> no data
CMD6: Switch Function --> data

But it was the right place to look for the error. I forgot to disable 
the DMA! Shame on me!!! I updated the code on github. The new log [5] 
looks now much better!

The log shows the following: reset  -> mmc rescan -> mmc info

@ reset I couldn't see any error happen (CMD 17 looks also good!). But 
it has some error the dos partition table.

@ mmc rescan only CMD 17 at the end fails

@ mmc info looks everything ok


Best Regards,

Philipp Rossak


[5] http://pastebin.com/H8mWTP4C


On 22.03.2017 12:18, Philipp Rossak wrote:
> Hi Jaehoon,
>
> Yes that what you mentioned is a timeout error. That error occurs if I 
> don't get a response from several Hardware/error flags (a counter 
> reaches  a limit).
>
> As you mentioned the cmd 6 shoudn't read any data. This is what I'm 
> doing if I'm transfering data:
>
> This is the function called from the upper layers:
>
> stm32_mmc_send_cmd(struct udevice *dev, struct mmc_cmd *cmd, struct 
> mmc_data *data)
>
> If it is necessary to transfer data all the related code for that is 
> placed in if conditions like below.
>
> if(data) { ... }
>
> Something interesting:
>
> Here is are two new logs I just recoreded a few minutes ago after some 
> sleep. The sourcecode is the same i just recompiled it and flashed it 
> again. You can see it on the timestamp in line 4. I used the same card 
> as in Log [1].
>
> Log [3]  behaves now different than before, there is no data read from 
> the cmd6
>
> Log [4] behaves similar to log [1].
>
> I made a diff between log [3] and Log [4] and till line 265 is 
> everything the same. @ line 266 & 267 the answer to cmd 51 is different!?
>
> Best Regards,
>
> Philipp Rossak
>
> [3] http://pastebin.com/AK3RB1bH
>
> [4] http://pastebin.com/xk2TkGpd
>
>
> On 22.03.2017 02:54, Jaehoon Chung wrote:
>> Hi Philipp,
>>
>> On 03/22/2017 10:38 AM, Philipp Rossak wrote:
>>> Hi Jaehoon,
>>>
>>> Thanks for that hint!
>>>
>>> I uploaded two logs to pastebin.
>>>
>>> Log [1] is a sandisk ultra 32gb sd card. This time I didn't got it 
>>> work properly.
>>>
>>> Log [2] is from an other 2gb sd card where I pressed the reset 
>>> button until I received data from CMD 17 command.
>>>
>>> Right now there are a lot of debug outputs, to make it for me easy 
>>> for me to find the errors. The most of them will be removed later.
>>>
>>> Best Regards,
>>>
>>> Philipp Rossak
>>>
>>>
>>> [1] http://pastebin.com/LcSSmBfp
>> In Log [1],
>>
>> mmc 0, cmd 6(0x00000446), arg 0x00fffff1
>> START DATA TRANSFER
>> CMD: 6
>> Timeout STA2: 00202040------------------
>> END DATA TRANSFER
>> Ret: -110  -  STA  00202540
>>
>> It seems timeout error, right? As i know, CMD6 doesn't have any data..
>> Even if didn't check your source code..i guess that you need to check 
>> whether it's waiting for completing data or not.
>> (or check the register about interrupt e.g, end of data interrupt..?)
>>
>>
>> In Log [2],
>>
>> It seems to fail the getting sd status...also timeout..
>> I need to check your source code..after that, i will review more..
>>
>> Best Regards,
>> Jaehoon Chung
>>
>>> [2] http://pastebin.com/zRbRMXtE
>>>
>>>
>>>
>>> On 22.03.2017 01:51, Jaehoon Chung wrote:
>>>> Hi Philipp,
>>>>
>>>> On 03/22/2017 09:27 AM, Philipp Rossak wrote:
>>>>> Hey everyone,
>>>>>
>>>>> I'm currently working on a SD / MMC Card driver for the 
>>>>> stm32f746g-disco Board. You can find my actual very early work 
>>>>> right here on my github repository: [0]
>>>>>
>>>>> Currently I'm getting errors that are not reproducible:
>>>>>
>>>>> - Errors on sending different commands (happens somtimes but 
>>>>> randomly)
>>>>>
>>>>> - Errors at CMD 17 & 18 reading procedures
>>>> If you can also share the log, it's helpful to check your problem.
>>>> I don't have board to test yours, but i can check your driver as 
>>>> code level.
>>>>
>>>> Best Regards,
>>>> Jaehoon Chung
>>>>
>>>>> And sometimes works everything without any problems....
>>>>>
>>>>> Right now I think that my hardware got broken (but I'm not sure). 
>>>>> It would be nice if someone could test the driver and send me the 
>>>>> log. A small code review would help me also.
>>>>>
>>>>> Thanks in advance!
>>>>>
>>>>> Best regards,
>>>>>
>>>>> Philipp Rossak
>>>>>
>>>>> [0] 
>>>>> https://github.com/embed-3d/stm32_mmc_driver/tree/stm32f7_mmc_hw_testing 
>>>>>
>>>>>
>>>>> _______________________________________________
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>>>
>>>
>