[U-Boot] Newbie SPL question for socfpga_sockit

[Marek Vasut]

On 04/12/2016 05:53 PM, Dinh Nguyen wrote:
> 
> 
> On 04/07/2016 06:31 PM, George Broz wrote:
>> On 7 April 2016 at 13:39, Marek Vasut <marex at denx.de> wrote:
>>> On 04/07/2016 03:14 PM, George Broz wrote:
>>>> On 6 April 2016 at 19:05, Marek Vasut <marex at denx.de> wrote:
>>>>> On 04/07/2016 03:42 AM, George Broz wrote:
>>>>>
>>>>> Hi,
>>>>>
>>>>>>>> U-Boot SPL 2016.03 (Apr 05 2016 - 17:57:23)
>>>>>>>> drivers/ddr/altera/sequencer.c: Preparing to start memory calibration
>>>>>>>> drivers/ddr/altera/sequencer.c: CALIBRATION PASSED
>>>>>>>> drivers/ddr/altera/sequencer.c: Calibration complete
>>>>>>>> Trying to boot from MMC1
>>>>>>>>
>>>>>>>> First time that an SPL built from a recent version has run successfully
>>>>>>>> on that board.
>>>>>>>>
>>>>>>>> Will try it out on de0 tomorrow morning...
>>>>>>>
>>>>>>> This is great news, thanks!
>>>>>>
>>>>>> This patch also fixes the intermittent SDRAM calibration failures on my
>>>>>> de0_nano_soc board. Thanks so much!
>>>>>
>>>>> Great
>>>>>
>>>>>> Now with up-to-date versions of SPL and image... I have some
>>>>>> USB questions/news/observations:
>>>>>>
>>>>>> When using an OTG cable between USB port and mass storage
>>>>>> device, the de0_nano_soc board is able to detect and access some USB
>>>>>> sticks. The detection with these is almost immediate from when 'usb start'
>>>>>> is entered. If the same (working) USB stick is used with a non-OTG cable,
>>>>>> I get the timeout messages from before:
>>>>>>
>>>>>> dwc_otg_core_host_init: Timeout!
>>>>>> dwc_otg_core_host_init: Timeout!
>>>>>>
>>>>>> and this is true even if I add 'dr_mode = "host" '
>>>>>
>>>>> I don't think the driver supports the dr_mode property yet. Patch is
>>>>> welcome.
>>>>>
>>>>>> to the dts for usb1
>>>>>> of the de0
>>>>>> (and rebuild/reload). The older SPL/image that ships from the Terasic factory
>>>>>> detects USB sticks with a non-OTG cable, (the cable that ships with the unit).
>>>>>> What is the correct "expected" behavior here?? Is an OTG cable required or
>>>>>> not?
>>>>>
>>>>> The DWC2 driver tests the value of the OTG ID pin, so if you don't use
>>>>> OTG cable with correct ID pin setup, the host won't work.
>>>>>
>>>>>> Even with the OTG cable, some USB sticks "fail" in a not-so-great way.
>>>>>> I have a Kingston stick and the sequence goes like this:
>>>>>>
>>>>>> => usb reset
>>>>>> resetting USB...
>>>>>> USB0:   Core Release: 2.93a
>>>>>> scanning bus 0 for devices...
>>>>>>
>>>>>> <<< 1 minute, 41 seconds pass before >>>
>>>>>> ... Device NOT ready
>>>>>>    Request Sense returned 00 00 00
>>>>>>
>>>>>>  <<< then another  24 seconds pass before >>>
>>>>>>
>>>>>> 2 USB Device(s) found
>>>>>>
>>>>>> It was able to read some information about the stick:
>>>>>>
>>>>>> => usb info
>>>>>> :
>>>>>> 2: Mass Storage,  USB Revision 2.0
>>>>>> - Kingston DataTraveler SE9 0014857749E5ECB0173000D3
>>>>>> - Class: (from Interface) Mass Storage
>>>>>> - PacketSize: 64  Configurations: 1
>>>>>> - Vendor: 0x0930  Product 0x6545 Version 1.0
>>>>>>    Configuration: 1
>>>>>>    - Interfaces: 1 Bus Powered 200mA
>>>>>>      Interface: 0
>>>>>>      - Alternate Setting 0, Endpoints: 2
>>>>>>      - Class Mass Storage, Transp. SCSI, Bulk only
>>>>>>      - Endpoint 1 In Bulk MaxPacket 512
>>>>>>      - Endpoint 2 Out Bulk MaxPacket 512
>>>>>>
>>>>>> BUT, the stick cannot be accessed otherwise, for example:
>>>>>>
>>>>>> => usb part 0
>>>>>> ## Unknown partition table type 0
>>>>>>
>>>>>>
>>>>>> Is there any feature of the USB stick that would indicate
>>>>>> whether or not it is "compatible" with u-boot?
>>>>>
>>>>> Can you do "dcache off" before you do "usb reset" and see if that fixes
>>>>> the problem ?
>>>>
>>>> The behavior is unchanged if "dcache off" done before "usb reset".
>>>
>>> Try with the attached patch (and probably with dcache off)
>>
>> The patch applied cleanly. The behavior is unchanged with both
>> dcache on and off. The "good" sticks still work, and "bad" sticks still don't.
>>
> 
> Not sure if this helps, but with this patch and dcache off, my "bad"
> stick (SanDisk Cruzer U 4C530200250418114310) is now working.

You mean the revert is needed on SoCFPGA, right ? I tried bashing Stefan
about the patch a bit and I am tempted to just revert it for now, since
there seems to be no time to repair it proper :(


-- 
Best regards,
Marek Vasut