[U-Boot] Newbie SPL question for socfpga_sockit

[George Broz]

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".

Best regards,
--George Broz

>
>> Thanks again for the calibration fix! Let me
>> know if there is something else I can test!
>
> Yeah, I CCed you on the DDR patches, so you can reply with your
> Tested-By for SoCkit and Nano-SoC. Thanks
>
> Best regards,
> Marek Vasut